diff --git a/base/bridge/IBridge.cpp b/base/bridge/IBridge.cpp
index 348b0fd7190..b1f71315fef 100644
--- a/base/bridge/IBridge.cpp
+++ b/base/bridge/IBridge.cpp
@@ -200,8 +200,8 @@ int IBridge::main(const std::vector<std::string> & /*args*/)
     http_params->setKeepAliveTimeout(keep_alive_timeout);
 
     auto shared_context = Context::createShared();
-    Context context(Context::createGlobal(shared_context.get()));
-    context.makeGlobalContext();
+    auto context = Context::createGlobal(shared_context.get());
+    context->makeGlobalContext();
 
     if (config().has("query_masking_rules"))
         SensitiveDataMasker::setInstance(std::make_unique<SensitiveDataMasker>(config(), "query_masking_rules"));
diff --git a/base/bridge/IBridge.h b/base/bridge/IBridge.h
index f9bb00f9e48..c64003d9959 100644
--- a/base/bridge/IBridge.h
+++ b/base/bridge/IBridge.h
@@ -2,10 +2,11 @@
 
 #include <Interpreters/Context.h>
 #include <Server/HTTP/HTTPRequestHandlerFactory.h>
-#include <Poco/Util/ServerApplication.h>
-#include <Poco/Logger.h>
 #include <daemon/BaseDaemon.h>
 
+#include <Poco/Logger.h>
+#include <Poco/Util/ServerApplication.h>
+
 
 namespace DB
 {
@@ -29,9 +30,9 @@ protected:
 
     int main(const std::vector<std::string> & args) override;
 
-    virtual const std::string bridgeName() const = 0;
+    virtual std::string bridgeName() const = 0;
 
-    virtual HandlerFactoryPtr getHandlerFactoryPtr(Context & context) const = 0;
+    virtual HandlerFactoryPtr getHandlerFactoryPtr(ContextPtr context) const = 0;
 
     size_t keep_alive_timeout;
 
diff --git a/programs/benchmark/Benchmark.cpp b/programs/benchmark/Benchmark.cpp
index a0e2ea155ba..1d2b579db3a 100644
--- a/programs/benchmark/Benchmark.cpp
+++ b/programs/benchmark/Benchmark.cpp
@@ -95,8 +95,8 @@ public:
             comparison_info_total.emplace_back(std::make_shared<Stats>());
         }
 
-        global_context.makeGlobalContext();
-        global_context.setSettings(settings);
+        global_context->makeGlobalContext();
+        global_context->setSettings(settings);
 
         std::cerr << std::fixed << std::setprecision(3);
 
@@ -159,7 +159,7 @@ private:
     bool print_stacktrace;
     const Settings & settings;
     SharedContextHolder shared_context;
-    Context global_context;
+    ContextPtr global_context;
     QueryProcessingStage::Enum query_processing_stage;
 
     /// Don't execute new queries after timelimit or SIGINT or exception
diff --git a/programs/client/Client.cpp b/programs/client/Client.cpp
index 555b1adc414..1aec3677b41 100644
--- a/programs/client/Client.cpp
+++ b/programs/client/Client.cpp
@@ -191,7 +191,7 @@ private:
     bool has_vertical_output_suffix = false; /// Is \G present at the end of the query string?
 
     SharedContextHolder shared_context = Context::createShared();
-    Context context = Context::createGlobal(shared_context.get());
+    ContextPtr context = Context::createGlobal(shared_context.get());
 
     /// Buffer that reads from stdin in batch mode.
     ReadBufferFromFileDescriptor std_in {STDIN_FILENO};
@@ -274,20 +274,20 @@ private:
 
         configReadClient(config(), home_path);
 
-        context.setApplicationType(Context::ApplicationType::CLIENT);
-        context.setQueryParameters(query_parameters);
+        context->setApplicationType(Context::ApplicationType::CLIENT);
+        context->setQueryParameters(query_parameters);
 
         /// settings and limits could be specified in config file, but passed settings has higher priority
-        for (const auto & setting : context.getSettingsRef().allUnchanged())
+        for (const auto & setting : context->getSettingsRef().allUnchanged())
         {
             const auto & name = setting.getName();
             if (config().has(name))
-                context.setSetting(name, config().getString(name));
+                context->setSetting(name, config().getString(name));
         }
 
         /// Set path for format schema files
         if (config().has("format_schema_path"))
-            context.setFormatSchemaPath(Poco::Path(config().getString("format_schema_path")).toString());
+            context->setFormatSchemaPath(Poco::Path(config().getString("format_schema_path")).toString());
 
         /// Initialize query_id_formats if any
         if (config().has("query_id_formats"))
@@ -538,15 +538,15 @@ private:
         else
             format = config().getString("format", is_interactive ? "PrettyCompact" : "TabSeparated");
 
-        format_max_block_size = config().getInt("format_max_block_size", context.getSettingsRef().max_block_size);
+        format_max_block_size = config().getInt("format_max_block_size", context->getSettingsRef().max_block_size);
 
         insert_format = "Values";
 
         /// Setting value from cmd arg overrides one from config
-        if (context.getSettingsRef().max_insert_block_size.changed)
-            insert_format_max_block_size = context.getSettingsRef().max_insert_block_size;
+        if (context->getSettingsRef().max_insert_block_size.changed)
+            insert_format_max_block_size = context->getSettingsRef().max_insert_block_size;
         else
-            insert_format_max_block_size = config().getInt("insert_format_max_block_size", context.getSettingsRef().max_insert_block_size);
+            insert_format_max_block_size = config().getInt("insert_format_max_block_size", context->getSettingsRef().max_insert_block_size);
 
         if (!is_interactive)
         {
@@ -555,7 +555,7 @@ private:
             ignore_error = config().getBool("ignore-error", false);
         }
 
-        ClientInfo & client_info = context.getClientInfo();
+        ClientInfo & client_info = context->getClientInfo();
         client_info.setInitialQuery();
         client_info.quota_key = config().getString("quota_key", "");
 
@@ -563,7 +563,7 @@ private:
 
         /// Initialize DateLUT here to avoid counting time spent here as query execution time.
         const auto local_tz = DateLUT::instance().getTimeZone();
-        if (!context.getSettingsRef().use_client_time_zone)
+        if (!context->getSettingsRef().use_client_time_zone)
         {
             const auto & time_zone = connection->getServerTimezone(connection_parameters.timeouts);
             if (!time_zone.empty())
@@ -738,7 +738,7 @@ private:
         {
             auto query_id = config().getString("query_id", "");
             if (!query_id.empty())
-                context.setCurrentQueryId(query_id);
+                context->setCurrentQueryId(query_id);
 
             nonInteractive();
 
@@ -1038,7 +1038,7 @@ private:
             {
                 Tokens tokens(this_query_begin, all_queries_end);
                 IParser::Pos token_iterator(tokens,
-                    context.getSettingsRef().max_parser_depth);
+                    context->getSettingsRef().max_parser_depth);
                 if (!token_iterator.isValid())
                 {
                     break;
@@ -1087,7 +1087,7 @@ private:
                 if (ignore_error)
                 {
                     Tokens tokens(this_query_begin, all_queries_end);
-                    IParser::Pos token_iterator(tokens, context.getSettingsRef().max_parser_depth);
+                    IParser::Pos token_iterator(tokens, context->getSettingsRef().max_parser_depth);
                     while (token_iterator->type != TokenType::Semicolon && token_iterator.isValid())
                         ++token_iterator;
                     this_query_begin = token_iterator->end;
@@ -1133,7 +1133,7 @@ private:
             // beneficial so that we see proper trailing comments in "echo" and
             // server log.
             adjustQueryEnd(this_query_end, all_queries_end,
-                context.getSettingsRef().max_parser_depth);
+                context->getSettingsRef().max_parser_depth);
 
             // full_query is the query + inline INSERT data + trailing comments
             // (the latter is our best guess for now).
@@ -1173,7 +1173,7 @@ private:
             {
                 this_query_end = insert_ast->end;
                 adjustQueryEnd(this_query_end, all_queries_end,
-                    context.getSettingsRef().max_parser_depth);
+                    context->getSettingsRef().max_parser_depth);
             }
 
             // Now we know for sure where the query ends.
@@ -1290,7 +1290,7 @@ private:
     // Prints changed settings to stderr. Useful for debugging fuzzing failures.
     void printChangedSettings() const
     {
-        const auto & changes = context.getSettingsRef().changes();
+        const auto & changes = context->getSettingsRef().changes();
         if (!changes.empty())
         {
             fmt::print(stderr, "Changed settings: ");
@@ -1590,11 +1590,11 @@ private:
         if (is_interactive)
         {
             // Generate a new query_id
-            context.setCurrentQueryId("");
+            context->setCurrentQueryId("");
             for (const auto & query_id_format : query_id_formats)
             {
                 writeString(query_id_format.first, std_out);
-                writeString(fmt::format(query_id_format.second, fmt::arg("query_id", context.getCurrentQueryId())), std_out);
+                writeString(fmt::format(query_id_format.second, fmt::arg("query_id", context->getCurrentQueryId())), std_out);
                 writeChar('\n', std_out);
                 std_out.next();
             }
@@ -1610,12 +1610,12 @@ private:
         {
             /// Temporarily apply query settings to context.
             std::optional<Settings> old_settings;
-            SCOPE_EXIT_SAFE({ if (old_settings) context.setSettings(*old_settings); });
+            SCOPE_EXIT_SAFE({ if (old_settings) context->setSettings(*old_settings); });
             auto apply_query_settings = [&](const IAST & settings_ast)
             {
                 if (!old_settings)
-                    old_settings.emplace(context.getSettingsRef());
-                context.applySettingsChanges(settings_ast.as<ASTSetQuery>()->changes);
+                    old_settings.emplace(context->getSettingsRef());
+                context->applySettingsChanges(settings_ast.as<ASTSetQuery>()->changes);
             };
             const auto * insert = parsed_query->as<ASTInsertQuery>();
             if (insert && insert->settings_ast)
@@ -1653,7 +1653,7 @@ private:
                     if (change.name == "profile")
                         current_profile = change.value.safeGet<String>();
                     else
-                        context.applySettingChange(change);
+                        context->applySettingChange(change);
                 }
             }
 
@@ -1725,10 +1725,10 @@ private:
                 connection->sendQuery(
                     connection_parameters.timeouts,
                     query_to_send,
-                    context.getCurrentQueryId(),
+                    context->getCurrentQueryId(),
                     query_processing_stage,
-                    &context.getSettingsRef(),
-                    &context.getClientInfo(),
+                    &context->getSettingsRef(),
+                    &context->getClientInfo(),
                     true);
 
                 sendExternalTables();
@@ -1766,10 +1766,10 @@ private:
         connection->sendQuery(
             connection_parameters.timeouts,
             query_to_send,
-            context.getCurrentQueryId(),
+            context->getCurrentQueryId(),
             query_processing_stage,
-            &context.getSettingsRef(),
-            &context.getClientInfo(),
+            &context->getSettingsRef(),
+            &context->getClientInfo(),
             true);
 
         sendExternalTables();
@@ -1792,7 +1792,7 @@ private:
         ParserQuery parser(end);
         ASTPtr res;
 
-        const auto & settings = context.getSettingsRef();
+        const auto & settings = context->getSettingsRef();
         size_t max_length = 0;
         if (!allow_multi_statements)
             max_length = settings.max_query_size;
@@ -1880,7 +1880,7 @@ private:
                 current_format = insert->format;
         }
 
-        BlockInputStreamPtr block_input = context.getInputFormat(
+        BlockInputStreamPtr block_input = context->getInputFormat(
             current_format, buf, sample, insert_format_max_block_size);
 
         if (columns_description.hasDefaults())
@@ -2204,9 +2204,9 @@ private:
 
             /// It is not clear how to write progress with parallel formatting. It may increase code complexity significantly.
             if (!need_render_progress)
-                block_out_stream = context.getOutputStreamParallelIfPossible(current_format, *out_buf, block);
+                block_out_stream = context->getOutputStreamParallelIfPossible(current_format, *out_buf, block);
             else
-                block_out_stream = context.getOutputStream(current_format, *out_buf, block);
+                block_out_stream = context->getOutputStream(current_format, *out_buf, block);
 
             block_out_stream->writePrefix();
         }
@@ -2710,12 +2710,12 @@ public:
             }
         }
 
-        context.makeGlobalContext();
-        context.setSettings(cmd_settings);
+        context->makeGlobalContext();
+        context->setSettings(cmd_settings);
 
         /// Copy settings-related program options to config.
         /// TODO: Is this code necessary?
-        for (const auto & setting : context.getSettingsRef().all())
+        for (const auto & setting : context->getSettingsRef().all())
         {
             const auto & name = setting.getName();
             if (options.count(name))
@@ -2807,7 +2807,7 @@ public:
         {
             std::string traceparent = options["opentelemetry-traceparent"].as<std::string>();
             std::string error;
-            if (!context.getClientInfo().client_trace_context.parseTraceparentHeader(
+            if (!context->getClientInfo().client_trace_context.parseTraceparentHeader(
                 traceparent, error))
             {
                 throw Exception(ErrorCodes::BAD_ARGUMENTS,
@@ -2818,7 +2818,7 @@ public:
 
         if (options.count("opentelemetry-tracestate"))
         {
-            context.getClientInfo().client_trace_context.tracestate =
+            context->getClientInfo().client_trace_context.tracestate =
                 options["opentelemetry-tracestate"].as<std::string>();
         }
 
diff --git a/programs/copier/ClusterCopier.cpp b/programs/copier/ClusterCopier.cpp
index bede40d65f5..aa9b359993e 100644
--- a/programs/copier/ClusterCopier.cpp
+++ b/programs/copier/ClusterCopier.cpp
@@ -22,7 +22,7 @@ namespace ErrorCodes
 
 void ClusterCopier::init()
 {
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
 
     task_description_watch_callback = [this] (const Coordination::WatchResponse & response)
     {
@@ -39,14 +39,14 @@ void ClusterCopier::init()
     task_cluster_initial_config = task_cluster_current_config;
 
     task_cluster->loadTasks(*task_cluster_initial_config);
-    context.setClustersConfig(task_cluster_initial_config, task_cluster->clusters_prefix);
+    getContext()->setClustersConfig(task_cluster_initial_config, task_cluster->clusters_prefix);
 
     /// Set up shards and their priority
     task_cluster->random_engine.seed(task_cluster->random_device());
     for (auto & task_table : task_cluster->table_tasks)
     {
-        task_table.cluster_pull = context.getCluster(task_table.cluster_pull_name);
-        task_table.cluster_push = context.getCluster(task_table.cluster_push_name);
+        task_table.cluster_pull = getContext()->getCluster(task_table.cluster_pull_name);
+        task_table.cluster_push = getContext()->getCluster(task_table.cluster_push_name);
         task_table.initShards(task_cluster->random_engine);
     }
 
@@ -206,7 +206,7 @@ void ClusterCopier::uploadTaskDescription(const std::string & task_path, const s
     if (task_config_str.empty())
         return;
 
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
 
     zookeeper->createAncestors(local_task_description_path);
     auto code = zookeeper->tryCreate(local_task_description_path, task_config_str, zkutil::CreateMode::Persistent);
@@ -219,7 +219,7 @@ void ClusterCopier::uploadTaskDescription(const std::string & task_path, const s
 
 void ClusterCopier::reloadTaskDescription()
 {
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
     task_description_watch_zookeeper = zookeeper;
 
     String task_config_str;
@@ -235,7 +235,7 @@ void ClusterCopier::reloadTaskDescription()
 
     /// Setup settings
     task_cluster->reloadSettings(*config);
-    context.setSettings(task_cluster->settings_common);
+    getContext()->setSettings(task_cluster->settings_common);
 
     task_cluster_current_config = config;
     task_description_current_stat = stat;
@@ -440,7 +440,7 @@ bool ClusterCopier::checkPartitionPieceIsDone(const TaskTable & task_table, cons
 {
     LOG_DEBUG(log, "Check that all shards processed partition {} piece {} successfully", partition_name, piece_number);
 
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
 
     /// Collect all shards that contain partition piece number piece_number.
     Strings piece_status_paths;
@@ -532,7 +532,7 @@ TaskStatus ClusterCopier::tryMoveAllPiecesToDestinationTable(const TaskTable & t
 
     LOG_DEBUG(log, "Try to move {} to destination table", partition_name);
 
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
 
     const auto current_partition_attach_is_active = task_table.getPartitionAttachIsActivePath(partition_name);
     const auto current_partition_attach_is_done   = task_table.getPartitionAttachIsDonePath(partition_name);
@@ -1095,7 +1095,7 @@ TaskStatus ClusterCopier::tryCreateDestinationTable(const ConnectionTimeouts & t
             = rewriteCreateQueryStorage(task_shard->current_pull_table_create_query, task_table.table_push, task_table.engine_push_ast);
         auto & create = create_query_push_ast->as<ASTCreateQuery &>();
         create.if_not_exists = true;
-        InterpreterCreateQuery::prepareOnClusterQuery(create, context, task_table.cluster_push_name);
+        InterpreterCreateQuery::prepareOnClusterQuery(create, getContext(), task_table.cluster_push_name);
         String query = queryToString(create_query_push_ast);
 
         LOG_DEBUG(log, "Create destination tables. Query: {}", query);
@@ -1211,7 +1211,7 @@ TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
 
     auto split_table_for_current_piece = task_shard.list_of_split_tables_on_shard[current_piece_number];
 
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
 
     const String piece_is_dirty_flag_path          = partition_piece.getPartitionPieceIsDirtyPath();
     const String piece_is_dirty_cleaned_path       = partition_piece.getPartitionPieceIsCleanedPath();
@@ -1262,7 +1262,7 @@ TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
 
         ParserQuery p_query(query.data() + query.size());
 
-        const auto & settings = context.getSettingsRef();
+        const auto & settings = getContext()->getSettingsRef();
         return parseQuery(p_query, query, settings.max_query_size, settings.max_parser_depth);
     };
 
@@ -1366,10 +1366,10 @@ TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
         ASTPtr query_select_ast = get_select_query(split_table_for_current_piece, "count()", /*enable_splitting*/ true);
         UInt64 count;
         {
-            Context local_context = context;
+            auto local_context = Context::createCopy(context);
             // Use pull (i.e. readonly) settings, but fetch data from destination servers
-            local_context.setSettings(task_cluster->settings_pull);
-            local_context.setSetting("skip_unavailable_shards", true);
+            local_context->setSettings(task_cluster->settings_pull);
+            local_context->setSetting("skip_unavailable_shards", true);
 
             Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_select_ast, local_context)->execute().getInputStream());
             count = (block) ? block.safeGetByPosition(0).column->getUInt(0) : 0;
@@ -1468,7 +1468,7 @@ TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
             query += "INSERT INTO " + getQuotedTable(split_table_for_current_piece) + " VALUES ";
 
             ParserQuery p_query(query.data() + query.size());
-            const auto & settings = context.getSettingsRef();
+            const auto & settings = getContext()->getSettingsRef();
             query_insert_ast = parseQuery(p_query, query, settings.max_query_size, settings.max_parser_depth);
 
             LOG_DEBUG(log, "Executing INSERT query: {}", query);
@@ -1476,18 +1476,18 @@ TaskStatus ClusterCopier::processPartitionPieceTaskImpl(
 
         try
         {
-            std::unique_ptr<Context> context_select = std::make_unique<Context>(context);
+            auto context_select = Context::createCopy(context);
             context_select->setSettings(task_cluster->settings_pull);
 
-            std::unique_ptr<Context> context_insert = std::make_unique<Context>(context);
+            auto context_insert = Context::createCopy(context);
             context_insert->setSettings(task_cluster->settings_push);
 
             /// Custom INSERT SELECT implementation
             BlockInputStreamPtr input;
             BlockOutputStreamPtr output;
             {
-                BlockIO io_select = InterpreterFactory::get(query_select_ast, *context_select)->execute();
-                BlockIO io_insert = InterpreterFactory::get(query_insert_ast, *context_insert)->execute();
+                BlockIO io_select = InterpreterFactory::get(query_select_ast, context_select)->execute();
+                BlockIO io_insert = InterpreterFactory::get(query_insert_ast, context_insert)->execute();
 
                 input = io_select.getInputStream();
                 output = io_insert.out;
@@ -1581,7 +1581,7 @@ void ClusterCopier::dropAndCreateLocalTable(const ASTPtr & create_ast)
     const auto & create = create_ast->as<ASTCreateQuery &>();
     dropLocalTableIfExists({create.database, create.table});
 
-    InterpreterCreateQuery interpreter(create_ast, context);
+    InterpreterCreateQuery interpreter(create_ast, getContext());
     interpreter.execute();
 }
 
@@ -1592,7 +1592,7 @@ void ClusterCopier::dropLocalTableIfExists(const DatabaseAndTableName & table_na
     drop_ast->database = table_name.first;
     drop_ast->table = table_name.second;
 
-    InterpreterDropQuery interpreter(drop_ast, context);
+    InterpreterDropQuery interpreter(drop_ast, getContext());
     interpreter.execute();
 }
 
@@ -1654,8 +1654,8 @@ void ClusterCopier::dropParticularPartitionPieceFromAllHelpingTables(const TaskT
 
 String ClusterCopier::getRemoteCreateTable(const DatabaseAndTableName & table, Connection & connection, const Settings & settings)
 {
-    Context remote_context(context);
-    remote_context.setSettings(settings);
+    auto remote_context = Context::createCopy(context);
+    remote_context->setSettings(settings);
 
     String query = "SHOW CREATE TABLE " + getQuotedTable(table);
     Block block = getBlockWithAllStreamData(std::make_shared<RemoteBlockInputStream>(
@@ -1674,7 +1674,7 @@ ASTPtr ClusterCopier::getCreateTableForPullShard(const ConnectionTimeouts & time
             task_cluster->settings_pull);
 
     ParserCreateQuery parser_create_query;
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
     return parseQuery(parser_create_query, create_query_pull_str, settings.max_query_size, settings.max_parser_depth);
 }
 
@@ -1703,7 +1703,7 @@ void ClusterCopier::createShardInternalTables(const ConnectionTimeouts & timeout
     /// Create special cluster with single shard
     String shard_read_cluster_name = read_shard_prefix + task_table.cluster_pull_name;
     ClusterPtr cluster_pull_current_shard = task_table.cluster_pull->getClusterWithSingleShard(task_shard.indexInCluster());
-    context.setCluster(shard_read_cluster_name, cluster_pull_current_shard);
+    getContext()->setCluster(shard_read_cluster_name, cluster_pull_current_shard);
 
     auto storage_shard_ast = createASTStorageDistributed(shard_read_cluster_name, task_table.table_pull.first, task_table.table_pull.second);
 
@@ -1763,13 +1763,13 @@ std::set<String> ClusterCopier::getShardPartitions(const ConnectionTimeouts & ti
     }
 
     ParserQuery parser_query(query.data() + query.size());
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
     ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
 
     LOG_DEBUG(log, "Computing destination partition set, executing query: {}", query);
 
-    Context local_context = context;
-    local_context.setSettings(task_cluster->settings_pull);
+    auto local_context = Context::createCopy(context);
+    local_context->setSettings(task_cluster->settings_pull);
     Block block = getBlockWithAllStreamData(InterpreterFactory::get(query_ast, local_context)->execute().getInputStream());
 
     if (block)
@@ -1809,11 +1809,11 @@ bool ClusterCopier::checkShardHasPartition(const ConnectionTimeouts & timeouts,
     LOG_DEBUG(log, "Checking shard {} for partition {} existence, executing query: {}", task_shard.getDescription(), partition_quoted_name, query);
 
     ParserQuery parser_query(query.data() + query.size());
-const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
     ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
 
-    Context local_context = context;
-    local_context.setSettings(task_cluster->settings_pull);
+    auto local_context = Context::createCopy(context);
+    local_context->setSettings(task_cluster->settings_pull);
     return InterpreterFactory::get(query_ast, local_context)->execute().getInputStream()->read().rows() != 0;
 }
 
@@ -1848,11 +1848,11 @@ bool ClusterCopier::checkPresentPartitionPiecesOnCurrentShard(const ConnectionTi
     LOG_DEBUG(log, "Checking shard {} for partition {} piece {} existence, executing query: {}", task_shard.getDescription(), partition_quoted_name, std::to_string(current_piece_number), query);
 
     ParserQuery parser_query(query.data() + query.size());
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
     ASTPtr query_ast = parseQuery(parser_query, query, settings.max_query_size, settings.max_parser_depth);
 
-    Context local_context = context;
-    local_context.setSettings(task_cluster->settings_pull);
+    auto local_context = Context::createCopy(context);
+    local_context->setSettings(task_cluster->settings_pull);
     auto result = InterpreterFactory::get(query_ast, local_context)->execute().getInputStream()->read().rows();
     if (result != 0)
         LOG_DEBUG(log, "Partition {} piece number {} is PRESENT on shard {}", partition_quoted_name, std::to_string(current_piece_number), task_shard.getDescription());
@@ -1908,7 +1908,7 @@ UInt64 ClusterCopier::executeQueryOnCluster(
         /// In that case we don't have local replicas, but do it just in case
         for (UInt64 i = 0; i < num_local_replicas; ++i)
         {
-            auto interpreter = InterpreterFactory::get(query_ast, context);
+            auto interpreter = InterpreterFactory::get(query_ast, getContext());
             interpreter->execute();
 
             if (increment_and_check_exit())
@@ -1923,8 +1923,8 @@ UInt64 ClusterCopier::executeQueryOnCluster(
             auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(shard_settings).getSaturated(shard_settings.max_execution_time);
             auto connections = shard.pool->getMany(timeouts, &shard_settings, pool_mode);
 
-            Context shard_context(context);
-            shard_context.setSettings(shard_settings);
+            auto shard_context = Context::createCopy(context);
+            shard_context->setSettings(shard_settings);
 
             for (auto & connection : connections)
             {
diff --git a/programs/copier/ClusterCopier.h b/programs/copier/ClusterCopier.h
index 95bb54cf4e1..e875ca7df2e 100644
--- a/programs/copier/ClusterCopier.h
+++ b/programs/copier/ClusterCopier.h
@@ -12,18 +12,17 @@
 namespace DB
 {
 
-class ClusterCopier
+class ClusterCopier : WithContext
 {
 public:
     ClusterCopier(const String & task_path_,
                   const String & host_id_,
                   const String & proxy_database_name_,
-                  Context & context_)
-            :
+                  ContextPtr context_)
+            : WithContext(context_),
             task_zookeeper_path(task_path_),
             host_id(host_id_),
             working_database_name(proxy_database_name_),
-            context(context_),
             log(&Poco::Logger::get("ClusterCopier")) {}
 
     void init();
@@ -36,7 +35,7 @@ public:
     /// Compute set of partitions, assume set of partitions aren't changed during the processing
     void discoverTablePartitions(const ConnectionTimeouts & timeouts, TaskTable & task_table, UInt64 num_threads = 0);
 
-    void uploadTaskDescription(const std::string & task_path, const std::string & task_file, const bool force);
+    void uploadTaskDescription(const std::string & task_path, const std::string & task_file, bool force);
 
     void reloadTaskDescription();
 
@@ -120,7 +119,7 @@ protected:
     /// Removes MATERIALIZED and ALIAS columns from create table query
     static ASTPtr removeAliasColumnsFromCreateQuery(const ASTPtr & query_ast);
 
-    bool tryDropPartitionPiece(ShardPartition & task_partition, const size_t current_piece_number,
+    bool tryDropPartitionPiece(ShardPartition & task_partition, size_t current_piece_number,
             const zkutil::ZooKeeperPtr & zookeeper, const CleanStateClock & clean_state_clock);
 
     static constexpr UInt64 max_table_tries = 3;
@@ -141,7 +140,7 @@ protected:
 
     TaskStatus processPartitionPieceTaskImpl(const ConnectionTimeouts & timeouts,
                                              ShardPartition & task_partition,
-                                             const size_t current_piece_number,
+                                             size_t current_piece_number,
                                              bool is_unprioritized_task);
 
     void dropAndCreateLocalTable(const ASTPtr & create_ast);
@@ -219,7 +218,6 @@ private:
 
     bool experimental_use_sample_offset{false};
 
-    Context & context;
     Poco::Logger * log;
 
     std::chrono::milliseconds default_sleep_time{1000};
diff --git a/programs/copier/ClusterCopierApp.cpp b/programs/copier/ClusterCopierApp.cpp
index 7dfadc87716..d3fff616b65 100644
--- a/programs/copier/ClusterCopierApp.cpp
+++ b/programs/copier/ClusterCopierApp.cpp
@@ -111,7 +111,7 @@ void ClusterCopierApp::mainImpl()
     LOG_INFO(log, "Starting clickhouse-copier (id {}, host_id {}, path {}, revision {})", process_id, host_id, process_path, ClickHouseRevision::getVersionRevision());
 
     SharedContextHolder shared_context = Context::createShared();
-    auto context = std::make_unique<Context>(Context::createGlobal(shared_context.get()));
+    auto context = Context::createGlobal(shared_context.get());
     context->makeGlobalContext();
     SCOPE_EXIT_SAFE(context->shutdown());
 
@@ -128,13 +128,13 @@ void ClusterCopierApp::mainImpl()
     registerFormats();
 
     static const std::string default_database = "_local";
-    DatabaseCatalog::instance().attachDatabase(default_database, std::make_shared<DatabaseMemory>(default_database, *context));
+    DatabaseCatalog::instance().attachDatabase(default_database, std::make_shared<DatabaseMemory>(default_database, context));
     context->setCurrentDatabase(default_database);
 
     /// Initialize query scope just in case.
-    CurrentThread::QueryScope query_scope(*context);
+    CurrentThread::QueryScope query_scope(context);
 
-    auto copier = std::make_unique<ClusterCopier>(task_path, host_id, default_database, *context);
+    auto copier = std::make_unique<ClusterCopier>(task_path, host_id, default_database, context);
     copier->setSafeMode(is_safe_mode);
     copier->setCopyFaultProbability(copy_fault_probability);
     copier->setMoveFaultProbability(move_fault_probability);
diff --git a/programs/format/Format.cpp b/programs/format/Format.cpp
index ba3d6e8557b..5bf19191353 100644
--- a/programs/format/Format.cpp
+++ b/programs/format/Format.cpp
@@ -102,8 +102,8 @@ int mainEntryClickHouseFormat(int argc, char ** argv)
             }
 
             SharedContextHolder shared_context = Context::createShared();
-            Context context = Context::createGlobal(shared_context.get());
-            context.makeGlobalContext();
+            auto context = Context::createGlobal(shared_context.get());
+            context->makeGlobalContext();
 
             registerFunctions();
             registerAggregateFunctions();
diff --git a/programs/library-bridge/HandlerFactory.cpp b/programs/library-bridge/HandlerFactory.cpp
index 4257877b512..9f53a24156f 100644
--- a/programs/library-bridge/HandlerFactory.cpp
+++ b/programs/library-bridge/HandlerFactory.cpp
@@ -16,7 +16,7 @@ namespace DB
             return std::make_unique<PingHandler>(keep_alive_timeout);
 
         if (request.getMethod() == Poco::Net::HTTPRequest::HTTP_POST)
-            return std::make_unique<LibraryRequestHandler>(keep_alive_timeout, context);
+            return std::make_unique<LibraryRequestHandler>(keep_alive_timeout, getContext());
 
         return nullptr;
     }
diff --git a/programs/library-bridge/HandlerFactory.h b/programs/library-bridge/HandlerFactory.h
index 5dee62740cf..93f0721bf01 100644
--- a/programs/library-bridge/HandlerFactory.h
+++ b/programs/library-bridge/HandlerFactory.h
@@ -12,17 +12,17 @@ class SharedLibraryHandler;
 using SharedLibraryHandlerPtr = std::shared_ptr<SharedLibraryHandler>;
 
 /// Factory for '/ping', '/' handlers.
-class LibraryBridgeHandlerFactory : public HTTPRequestHandlerFactory
+class LibraryBridgeHandlerFactory : public HTTPRequestHandlerFactory, WithContext
 {
 public:
     LibraryBridgeHandlerFactory(
             const std::string & name_,
             size_t keep_alive_timeout_,
-            Context & context_)
-        : log(&Poco::Logger::get(name_))
+            ContextPtr context_)
+        : WithContext(context_)
+        , log(&Poco::Logger::get(name_))
         , name(name_)
         , keep_alive_timeout(keep_alive_timeout_)
-        , context(context_)
     {
     }
 
@@ -32,7 +32,6 @@ private:
     Poco::Logger * log;
     std::string name;
     size_t keep_alive_timeout;
-    Context & context;
 };
 
 }
diff --git a/programs/library-bridge/Handlers.cpp b/programs/library-bridge/Handlers.cpp
index ad2cc5f9d9e..6a1bfbbccb7 100644
--- a/programs/library-bridge/Handlers.cpp
+++ b/programs/library-bridge/Handlers.cpp
@@ -131,7 +131,7 @@ void LibraryRequestHandler::handleRequest(HTTPServerRequest & request, HTTPServe
             }
 
             ReadBufferFromString read_block_buf(params.get("null_values"));
-            auto format = FormatFactory::instance().getInput(FORMAT, read_block_buf, *sample_block, context, DEFAULT_BLOCK_SIZE);
+            auto format = FormatFactory::instance().getInput(FORMAT, read_block_buf, *sample_block, getContext(), DEFAULT_BLOCK_SIZE);
             auto reader = std::make_shared<InputStreamFromInputFormat>(format);
             auto sample_block_with_nulls = reader->read();
 
@@ -176,7 +176,7 @@ void LibraryRequestHandler::handleRequest(HTTPServerRequest & request, HTTPServe
             const auto & sample_block = library_handler->getSampleBlock();
             auto input = library_handler->loadAll();
 
-            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, context);
+            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, getContext());
             copyData(*input, *output);
         }
         else if (method == "loadIds")
@@ -193,7 +193,7 @@ void LibraryRequestHandler::handleRequest(HTTPServerRequest & request, HTTPServe
             auto library_handler = SharedLibraryHandlerFactory::instance().get(dictionary_id);
             const auto & sample_block = library_handler->getSampleBlock();
             auto input = library_handler->loadIds(ids);
-            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, context);
+            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, getContext());
             copyData(*input, *output);
         }
         else if (method == "loadKeys")
@@ -219,14 +219,14 @@ void LibraryRequestHandler::handleRequest(HTTPServerRequest & request, HTTPServe
             }
 
             auto & read_buf = request.getStream();
-            auto format = FormatFactory::instance().getInput(FORMAT, read_buf, *requested_sample_block, context, DEFAULT_BLOCK_SIZE);
+            auto format = FormatFactory::instance().getInput(FORMAT, read_buf, *requested_sample_block, getContext(), DEFAULT_BLOCK_SIZE);
             auto reader = std::make_shared<InputStreamFromInputFormat>(format);
             auto block = reader->read();
 
             auto library_handler = SharedLibraryHandlerFactory::instance().get(dictionary_id);
             const auto & sample_block = library_handler->getSampleBlock();
             auto input = library_handler->loadKeys(block.getColumns());
-            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, context);
+            BlockOutputStreamPtr output = FormatFactory::instance().getOutputStream(FORMAT, out, sample_block, getContext());
             copyData(*input, *output);
         }
     }
diff --git a/programs/library-bridge/Handlers.h b/programs/library-bridge/Handlers.h
index 9b163095da2..dac61d3a735 100644
--- a/programs/library-bridge/Handlers.h
+++ b/programs/library-bridge/Handlers.h
@@ -17,16 +17,16 @@ namespace DB
 /// names of dictionary attributes, sample block to parse block of null values, block of null values. Everything is
 /// passed in binary format and is urlencoded. When dictionary is cloned, a new handler is created.
 /// Each handler is unique to dictionary.
-class LibraryRequestHandler : public HTTPRequestHandler
+class LibraryRequestHandler : public HTTPRequestHandler, WithContext
 {
 public:
 
     LibraryRequestHandler(
         size_t keep_alive_timeout_,
-        Context & context_)
-        : log(&Poco::Logger::get("LibraryRequestHandler"))
+        ContextPtr context_)
+        : WithContext(context_)
+        , log(&Poco::Logger::get("LibraryRequestHandler"))
         , keep_alive_timeout(keep_alive_timeout_)
-        , context(context_)
     {
     }
 
@@ -39,7 +39,6 @@ private:
 
     Poco::Logger * log;
     size_t keep_alive_timeout;
-    Context & context;
 };
 
 
diff --git a/programs/library-bridge/LibraryBridge.h b/programs/library-bridge/LibraryBridge.h
index 168df76b9e2..9f2dafb89ab 100644
--- a/programs/library-bridge/LibraryBridge.h
+++ b/programs/library-bridge/LibraryBridge.h
@@ -12,12 +12,12 @@ class LibraryBridge : public IBridge
 {
 
 protected:
-    const std::string bridgeName() const override
+    std::string bridgeName() const override
     {
         return "LibraryBridge";
     }
 
-    HandlerFactoryPtr getHandlerFactoryPtr(Context & context) const override
+    HandlerFactoryPtr getHandlerFactoryPtr(ContextPtr context) const override
     {
         return std::make_shared<LibraryBridgeHandlerFactory>("LibraryRequestHandlerFactory-factory", keep_alive_timeout, context);
     }
diff --git a/programs/local/LocalServer.cpp b/programs/local/LocalServer.cpp
index 2909b838c84..f680c2c2da6 100644
--- a/programs/local/LocalServer.cpp
+++ b/programs/local/LocalServer.cpp
@@ -99,9 +99,9 @@ void LocalServer::initialize(Poco::Util::Application & self)
     }
 }
 
-void LocalServer::applyCmdSettings(Context & context)
+void LocalServer::applyCmdSettings(ContextPtr context)
 {
-    context.applySettingsChanges(cmd_settings.changes());
+    context->applySettingsChanges(cmd_settings.changes());
 }
 
 /// If path is specified and not empty, will try to setup server environment and load existing metadata
@@ -176,7 +176,7 @@ void LocalServer::tryInitPath()
 }
 
 
-static void attachSystemTables(const Context & context)
+static void attachSystemTables(ContextPtr context)
 {
     DatabasePtr system_database = DatabaseCatalog::instance().tryGetDatabase(DatabaseCatalog::SYSTEM_DATABASE);
     if (!system_database)
@@ -211,7 +211,7 @@ try
     }
 
     shared_context = Context::createShared();
-    global_context = std::make_unique<Context>(Context::createGlobal(shared_context.get()));
+    global_context = Context::createGlobal(shared_context.get());
     global_context->makeGlobalContext();
     global_context->setApplicationType(Context::ApplicationType::LOCAL);
     tryInitPath();
@@ -274,9 +274,9 @@ try
       *  if such tables will not be dropped, clickhouse-server will not be able to load them due to security reasons.
       */
     std::string default_database = config().getString("default_database", "_local");
-    DatabaseCatalog::instance().attachDatabase(default_database, std::make_shared<DatabaseMemory>(default_database, *global_context));
+    DatabaseCatalog::instance().attachDatabase(default_database, std::make_shared<DatabaseMemory>(default_database, global_context));
     global_context->setCurrentDatabase(default_database);
-    applyCmdOptions(*global_context);
+    applyCmdOptions(global_context);
 
     if (config().has("path"))
     {
@@ -288,15 +288,15 @@ try
         LOG_DEBUG(log, "Loading metadata from {}", path);
         Poco::File(path + "data/").createDirectories();
         Poco::File(path + "metadata/").createDirectories();
-        loadMetadataSystem(*global_context);
-        attachSystemTables(*global_context);
-        loadMetadata(*global_context);
+        loadMetadataSystem(global_context);
+        attachSystemTables(global_context);
+        loadMetadata(global_context);
         DatabaseCatalog::instance().loadDatabases();
         LOG_DEBUG(log, "Loaded metadata.");
     }
     else if (!config().has("no-system-tables"))
     {
-        attachSystemTables(*global_context);
+        attachSystemTables(global_context);
     }
 
     processQueries();
@@ -375,13 +375,13 @@ void LocalServer::processQueries()
 
     /// we can't mutate global global_context (can lead to races, as it was already passed to some background threads)
     /// so we can't reuse it safely as a query context and need a copy here
-    auto context = Context(*global_context);
+    auto context = Context::createCopy(global_context);
 
-    context.makeSessionContext();
-    context.makeQueryContext();
+    context->makeSessionContext();
+    context->makeQueryContext();
 
-    context.setUser("default", "", Poco::Net::SocketAddress{});
-    context.setCurrentQueryId("");
+    context->setUser("default", "", Poco::Net::SocketAddress{});
+    context->setCurrentQueryId("");
     applyCmdSettings(context);
 
     /// Use the same query_id (and thread group) for all queries
@@ -618,9 +618,9 @@ void LocalServer::init(int argc, char ** argv)
     argsToConfig(arguments, config(), 100);
 }
 
-void LocalServer::applyCmdOptions(Context & context)
+void LocalServer::applyCmdOptions(ContextPtr context)
 {
-    context.setDefaultFormat(config().getString("output-format", config().getString("format", "TSV")));
+    context->setDefaultFormat(config().getString("output-format", config().getString("format", "TSV")));
     applyCmdSettings(context);
 }
 
diff --git a/programs/local/LocalServer.h b/programs/local/LocalServer.h
index 02778bd86cb..3555e8a38ad 100644
--- a/programs/local/LocalServer.h
+++ b/programs/local/LocalServer.h
@@ -36,15 +36,15 @@ private:
     std::string getInitialCreateTableQuery();
 
     void tryInitPath();
-    void applyCmdOptions(Context & context);
-    void applyCmdSettings(Context & context);
+    void applyCmdOptions(ContextPtr context);
+    void applyCmdSettings(ContextPtr context);
     void processQueries();
     void setupUsers();
     void cleanup();
 
 protected:
     SharedContextHolder shared_context;
-    std::unique_ptr<Context> global_context;
+    ContextPtr global_context;
 
     /// Settings specified via command line args
     Settings cmd_settings;
diff --git a/programs/obfuscator/Obfuscator.cpp b/programs/obfuscator/Obfuscator.cpp
index aea70ba0986..c92eb5c6647 100644
--- a/programs/obfuscator/Obfuscator.cpp
+++ b/programs/obfuscator/Obfuscator.cpp
@@ -1129,8 +1129,8 @@ try
     }
 
     SharedContextHolder shared_context = Context::createShared();
-    Context context = Context::createGlobal(shared_context.get());
-    context.makeGlobalContext();
+    ContextPtr context = Context::createGlobal(shared_context.get());
+    context->makeGlobalContext();
 
     ReadBufferFromFileDescriptor file_in(STDIN_FILENO);
     WriteBufferFromFileDescriptor file_out(STDOUT_FILENO);
@@ -1152,7 +1152,7 @@ try
         if (!silent)
             std::cerr << "Training models\n";
 
-        BlockInputStreamPtr input = context.getInputFormat(input_format, file_in, header, max_block_size);
+        BlockInputStreamPtr input = context->getInputFormat(input_format, file_in, header, max_block_size);
 
         input->readPrefix();
         while (Block block = input->read())
@@ -1179,8 +1179,8 @@ try
 
         file_in.seek(0, SEEK_SET);
 
-        BlockInputStreamPtr input = context.getInputFormat(input_format, file_in, header, max_block_size);
-        BlockOutputStreamPtr output = context.getOutputStreamParallelIfPossible(output_format, file_out, header);
+        BlockInputStreamPtr input = context->getInputFormat(input_format, file_in, header, max_block_size);
+        BlockOutputStreamPtr output = context->getOutputStreamParallelIfPossible(output_format, file_out, header);
 
         if (processed_rows + source_rows > limit)
             input = std::make_shared<LimitBlockInputStream>(input, limit - processed_rows, 0);
diff --git a/programs/odbc-bridge/ColumnInfoHandler.cpp b/programs/odbc-bridge/ColumnInfoHandler.cpp
index 14fa734f246..2e0f5f87413 100644
--- a/programs/odbc-bridge/ColumnInfoHandler.cpp
+++ b/programs/odbc-bridge/ColumnInfoHandler.cpp
@@ -109,7 +109,7 @@ void ODBCColumnsInfoHandler::handleRequest(HTTPServerRequest & request, HTTPServ
 
         SCOPE_EXIT(SQLFreeStmt(hstmt, SQL_DROP));
 
-        const auto & context_settings = context.getSettingsRef();
+        const auto & context_settings = getContext()->getSettingsRef();
 
         /// TODO Why not do SQLColumns instead?
         std::string name = schema_name.empty() ? backQuoteIfNeed(table_name) : backQuoteIfNeed(schema_name) + "." + backQuoteIfNeed(table_name);
diff --git a/programs/odbc-bridge/ColumnInfoHandler.h b/programs/odbc-bridge/ColumnInfoHandler.h
index 9b5b470b31d..b4143c289a8 100644
--- a/programs/odbc-bridge/ColumnInfoHandler.h
+++ b/programs/odbc-bridge/ColumnInfoHandler.h
@@ -2,7 +2,7 @@
 
 #if USE_ODBC
 
-#    include <Interpreters/Context.h>
+#    include <Interpreters/Context_fwd.h>
 #    include <Server/HTTP/HTTPRequestHandler.h>
 #    include <Common/config.h>
 
@@ -15,11 +15,11 @@
 namespace DB
 {
 
-class ODBCColumnsInfoHandler : public HTTPRequestHandler
+class ODBCColumnsInfoHandler : public HTTPRequestHandler, WithContext
 {
 public:
-    ODBCColumnsInfoHandler(size_t keep_alive_timeout_, Context & context_)
-        : log(&Poco::Logger::get("ODBCColumnsInfoHandler")), keep_alive_timeout(keep_alive_timeout_), context(context_)
+    ODBCColumnsInfoHandler(size_t keep_alive_timeout_, ContextPtr context_)
+        : WithContext(context_), log(&Poco::Logger::get("ODBCColumnsInfoHandler")), keep_alive_timeout(keep_alive_timeout_)
     {
     }
 
@@ -28,7 +28,6 @@ public:
 private:
     Poco::Logger * log;
     size_t keep_alive_timeout;
-    Context & context;
 };
 
 }
diff --git a/programs/odbc-bridge/HandlerFactory.cpp b/programs/odbc-bridge/HandlerFactory.cpp
index 3b99673e955..38ddd75d553 100644
--- a/programs/odbc-bridge/HandlerFactory.cpp
+++ b/programs/odbc-bridge/HandlerFactory.cpp
@@ -21,26 +21,26 @@ std::unique_ptr<HTTPRequestHandler> ODBCBridgeHandlerFactory::createRequestHandl
 
         if (uri.getPath() == "/columns_info")
 #if USE_ODBC
-            return std::make_unique<ODBCColumnsInfoHandler>(keep_alive_timeout, context);
+            return std::make_unique<ODBCColumnsInfoHandler>(keep_alive_timeout, getContext());
 #else
             return nullptr;
 #endif
         else if (uri.getPath() == "/identifier_quote")
 #if USE_ODBC
-            return std::make_unique<IdentifierQuoteHandler>(keep_alive_timeout, context);
+            return std::make_unique<IdentifierQuoteHandler>(keep_alive_timeout, getContext());
 #else
             return nullptr;
 #endif
         else if (uri.getPath() == "/schema_allowed")
 #if USE_ODBC
-            return std::make_unique<SchemaAllowedHandler>(keep_alive_timeout, context);
+            return std::make_unique<SchemaAllowedHandler>(keep_alive_timeout, getContext());
 #else
             return nullptr;
 #endif
         else if (uri.getPath() == "/write")
-            return std::make_unique<ODBCHandler>(pool_map, keep_alive_timeout, context, "write");
+            return std::make_unique<ODBCHandler>(pool_map, keep_alive_timeout, getContext(), "write");
         else
-            return std::make_unique<ODBCHandler>(pool_map, keep_alive_timeout, context, "read");
+            return std::make_unique<ODBCHandler>(pool_map, keep_alive_timeout, getContext(), "read");
     }
     return nullptr;
 }
diff --git a/programs/odbc-bridge/HandlerFactory.h b/programs/odbc-bridge/HandlerFactory.h
index 9db183a2f9c..59ec88e053c 100644
--- a/programs/odbc-bridge/HandlerFactory.h
+++ b/programs/odbc-bridge/HandlerFactory.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <Interpreters/Context.h>
+#include <Interpreters/Context_fwd.h>
 #include <Server/HTTP/HTTPRequestHandlerFactory.h>
 #include "ColumnInfoHandler.h"
 #include "IdentifierQuoteHandler.h"
@@ -20,11 +20,11 @@ namespace DB
 /** Factory for '/ping', '/', '/columns_info', '/identifier_quote', '/schema_allowed' handlers.
   * Also stores Session pools for ODBC connections
   */
-class ODBCBridgeHandlerFactory : public HTTPRequestHandlerFactory
+class ODBCBridgeHandlerFactory : public HTTPRequestHandlerFactory, WithContext
 {
 public:
-    ODBCBridgeHandlerFactory(const std::string & name_, size_t keep_alive_timeout_, Context & context_)
-        : log(&Poco::Logger::get(name_)), name(name_), keep_alive_timeout(keep_alive_timeout_), context(context_)
+    ODBCBridgeHandlerFactory(const std::string & name_, size_t keep_alive_timeout_, ContextPtr context_)
+        : WithContext(context_), log(&Poco::Logger::get(name_)), name(name_), keep_alive_timeout(keep_alive_timeout_)
     {
         pool_map = std::make_shared<ODBCHandler::PoolMap>();
     }
@@ -35,7 +35,6 @@ private:
     Poco::Logger * log;
     std::string name;
     size_t keep_alive_timeout;
-    Context & context;
     std::shared_ptr<ODBCHandler::PoolMap> pool_map;
 };
 
diff --git a/programs/odbc-bridge/IdentifierQuoteHandler.h b/programs/odbc-bridge/IdentifierQuoteHandler.h
index dad88c72ad8..d851abc83ec 100644
--- a/programs/odbc-bridge/IdentifierQuoteHandler.h
+++ b/programs/odbc-bridge/IdentifierQuoteHandler.h
@@ -14,7 +14,7 @@ namespace DB
 class IdentifierQuoteHandler : public HTTPRequestHandler
 {
 public:
-    IdentifierQuoteHandler(size_t keep_alive_timeout_, Context &)
+    IdentifierQuoteHandler(size_t keep_alive_timeout_, ContextPtr)
         : log(&Poco::Logger::get("IdentifierQuoteHandler")), keep_alive_timeout(keep_alive_timeout_)
     {
     }
diff --git a/programs/odbc-bridge/MainHandler.cpp b/programs/odbc-bridge/MainHandler.cpp
index 079fc371ab4..679dfa70c45 100644
--- a/programs/odbc-bridge/MainHandler.cpp
+++ b/programs/odbc-bridge/MainHandler.cpp
@@ -165,7 +165,7 @@ void ODBCHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse
 
             auto pool = getPool(connection_string);
             auto & read_buf = request.getStream();
-            auto input_format = FormatFactory::instance().getInput(format, read_buf, *sample_block, context, max_block_size);
+            auto input_format = FormatFactory::instance().getInput(format, read_buf, *sample_block, getContext(), max_block_size);
             auto input_stream = std::make_shared<InputStreamFromInputFormat>(input_format);
             ODBCBlockOutputStream output_stream(pool->get(), db_name, table_name, *sample_block, quoting_style);
             copyData(*input_stream, output_stream);
@@ -176,7 +176,8 @@ void ODBCHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse
             std::string query = params.get("query");
             LOG_TRACE(log, "Query: {}", query);
 
-            BlockOutputStreamPtr writer = FormatFactory::instance().getOutputStreamParallelIfPossible(format, out, *sample_block, context);
+            BlockOutputStreamPtr writer
+                = FormatFactory::instance().getOutputStreamParallelIfPossible(format, out, *sample_block, getContext());
             auto pool = getPool(connection_string);
             ODBCBlockInputStream inp(pool->get(), query, *sample_block, max_block_size);
             copyData(inp, *writer);
diff --git a/programs/odbc-bridge/MainHandler.h b/programs/odbc-bridge/MainHandler.h
index e237ede5814..da6cb5c51b6 100644
--- a/programs/odbc-bridge/MainHandler.h
+++ b/programs/odbc-bridge/MainHandler.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <Interpreters/Context.h>
+#include <Interpreters/Context_fwd.h>
 #include <Server/HTTP/HTTPRequestHandler.h>
 
 #include <Poco/Logger.h>
@@ -10,6 +10,10 @@
 #include <Poco/Data/SessionPool.h>
 #pragma GCC diagnostic pop
 
+#include <mutex>
+#include <unordered_map>
+
+
 namespace DB
 {
 /** Main handler for requests to ODBC driver
@@ -17,7 +21,7 @@ namespace DB
   * and also query in request body
   * response in RowBinary format
   */
-class ODBCHandler : public HTTPRequestHandler
+class ODBCHandler : public HTTPRequestHandler, WithContext
 {
 public:
     using PoolPtr = std::shared_ptr<Poco::Data::SessionPool>;
@@ -25,12 +29,12 @@ public:
 
     ODBCHandler(std::shared_ptr<PoolMap> pool_map_,
         size_t keep_alive_timeout_,
-        Context & context_,
+        ContextPtr context_,
         const String & mode_)
-        : log(&Poco::Logger::get("ODBCHandler"))
+        : WithContext(context_)
+        , log(&Poco::Logger::get("ODBCHandler"))
         , pool_map(pool_map_)
         , keep_alive_timeout(keep_alive_timeout_)
-        , context(context_)
         , mode(mode_)
     {
     }
@@ -42,7 +46,6 @@ private:
 
     std::shared_ptr<PoolMap> pool_map;
     size_t keep_alive_timeout;
-    Context & context;
     String mode;
 
     static inline std::mutex mutex;
diff --git a/programs/odbc-bridge/ODBCBridge.h b/programs/odbc-bridge/ODBCBridge.h
index 598167835c6..b17051dce91 100644
--- a/programs/odbc-bridge/ODBCBridge.h
+++ b/programs/odbc-bridge/ODBCBridge.h
@@ -13,12 +13,12 @@ class ODBCBridge : public IBridge
 {
 
 protected:
-    const std::string bridgeName() const override
+    std::string bridgeName() const override
     {
         return "ODBCBridge";
     }
 
-    HandlerFactoryPtr getHandlerFactoryPtr(Context & context) const override
+    HandlerFactoryPtr getHandlerFactoryPtr(ContextPtr context) const override
     {
         return std::make_shared<ODBCBridgeHandlerFactory>("ODBCRequestHandlerFactory-factory", keep_alive_timeout, context);
     }
diff --git a/programs/odbc-bridge/SchemaAllowedHandler.h b/programs/odbc-bridge/SchemaAllowedHandler.h
index 91eddf67803..eb110f15bda 100644
--- a/programs/odbc-bridge/SchemaAllowedHandler.h
+++ b/programs/odbc-bridge/SchemaAllowedHandler.h
@@ -15,7 +15,7 @@ class Context;
 class SchemaAllowedHandler : public HTTPRequestHandler
 {
 public:
-    SchemaAllowedHandler(size_t keep_alive_timeout_, Context &)
+    SchemaAllowedHandler(size_t keep_alive_timeout_, ContextPtr)
         : log(&Poco::Logger::get("SchemaAllowedHandler")), keep_alive_timeout(keep_alive_timeout_)
     {
     }
diff --git a/programs/server/Server.cpp b/programs/server/Server.cpp
index 61e440bcfe1..6a22772ff82 100644
--- a/programs/server/Server.cpp
+++ b/programs/server/Server.cpp
@@ -426,8 +426,7 @@ int Server::main(const std::vector<std::string> & /*args*/)
       *  settings, available functions, data types, aggregate functions, databases, ...
       */
     auto shared_context = Context::createShared();
-    auto global_context = std::make_unique<Context>(Context::createGlobal(shared_context.get()));
-    global_context_ptr = global_context.get();
+    global_context = Context::createGlobal(shared_context.get());
 
     global_context->makeGlobalContext();
     global_context->setApplicationType(Context::ApplicationType::SERVER);
@@ -934,7 +933,6 @@ int Server::main(const std::vector<std::string> & /*args*/)
         /** Explicitly destroy Context. It is more convenient than in destructor of Server, because logger is still available.
           * At this moment, no one could own shared part of Context.
           */
-        global_context_ptr = nullptr;
         global_context.reset();
         shared_context.reset();
         LOG_DEBUG(log, "Destroyed global context.");
@@ -948,14 +946,14 @@ int Server::main(const std::vector<std::string> & /*args*/)
 
     try
     {
-        loadMetadataSystem(*global_context);
+        loadMetadataSystem(global_context);
         /// After attaching system databases we can initialize system log.
         global_context->initializeSystemLogs();
         auto & database_catalog = DatabaseCatalog::instance();
         /// After the system database is created, attach virtual system tables (in addition to query_log and part_log)
         attachSystemTablesServer(*database_catalog.getSystemDatabase(), has_zookeeper);
         /// Then, load remaining databases
-        loadMetadata(*global_context, default_database);
+        loadMetadata(global_context, default_database);
         database_catalog.loadDatabases();
         /// After loading validate that default database exists
         database_catalog.assertDatabaseExists(default_database);
@@ -1035,7 +1033,7 @@ int Server::main(const std::vector<std::string> & /*args*/)
     else
     {
         /// Initialize a watcher periodically updating DNS cache
-        dns_cache_updater = std::make_unique<DNSCacheUpdater>(*global_context, config().getInt("dns_cache_update_period", 15));
+        dns_cache_updater = std::make_unique<DNSCacheUpdater>(global_context, config().getInt("dns_cache_update_period", 15));
     }
 
 #if defined(OS_LINUX)
@@ -1067,7 +1065,7 @@ int Server::main(const std::vector<std::string> & /*args*/)
     {
         /// This object will periodically calculate some metrics.
         AsynchronousMetrics async_metrics(
-            *global_context, config().getUInt("asynchronous_metrics_update_period_s", 60), servers_to_start_before_tables, servers);
+            global_context, config().getUInt("asynchronous_metrics_update_period_s", 60), servers_to_start_before_tables, servers);
         attachSystemTablesAsync(*DatabaseCatalog::instance().getSystemDatabase(), async_metrics);
 
         for (const auto & listen_host : listen_hosts)
@@ -1330,7 +1328,7 @@ int Server::main(const std::vector<std::string> & /*args*/)
             int pool_size = config().getInt("distributed_ddl.pool_size", 1);
             if (pool_size < 1)
                 throw Exception("distributed_ddl.pool_size should be greater then 0", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
-            global_context->setDDLWorker(std::make_unique<DDLWorker>(pool_size, ddl_zookeeper_path, *global_context, &config(),
+            global_context->setDDLWorker(std::make_unique<DDLWorker>(pool_size, ddl_zookeeper_path, global_context, &config(),
                                                                      "distributed_ddl", "DDLWorker", &CurrentMetrics::MaxDDLEntryID));
         }
 
diff --git a/programs/server/Server.h b/programs/server/Server.h
index fbfc26f6ee5..c698108767c 100644
--- a/programs/server/Server.h
+++ b/programs/server/Server.h
@@ -40,9 +40,9 @@ public:
         return BaseDaemon::logger();
     }
 
-    Context & context() const override
+    ContextPtr context() const override
     {
-        return *global_context_ptr;
+        return global_context;
     }
 
     bool isCancelled() const override
@@ -64,8 +64,7 @@ protected:
     std::string getDefaultCorePath() const override;
 
 private:
-    Context * global_context_ptr = nullptr;
-
+    ContextPtr global_context;
     Poco::Net::SocketAddress socketBindListen(Poco::Net::ServerSocket & socket, const std::string & host, UInt16 port, [[maybe_unused]] bool secure = false) const;
 
     using CreateServerFunc = std::function<void(UInt16)>;
diff --git a/src/AggregateFunctions/AggregateFunctionFactory.cpp b/src/AggregateFunctions/AggregateFunctionFactory.cpp
index c0011b6ebec..eec8b374424 100644
--- a/src/AggregateFunctions/AggregateFunctionFactory.cpp
+++ b/src/AggregateFunctions/AggregateFunctionFactory.cpp
@@ -121,7 +121,7 @@ AggregateFunctionPtr AggregateFunctionFactory::getImpl(
         is_case_insensitive = true;
     }
 
-    const Context * query_context = nullptr;
+    ContextPtr query_context;
     if (CurrentThread::isInitialized())
         query_context = CurrentThread::get().getQueryContext();
 
diff --git a/src/AggregateFunctions/AggregateFunctionMLMethod.cpp b/src/AggregateFunctions/AggregateFunctionMLMethod.cpp
index 6c5c5af2f1d..145660e881b 100644
--- a/src/AggregateFunctions/AggregateFunctionMLMethod.cpp
+++ b/src/AggregateFunctions/AggregateFunctionMLMethod.cpp
@@ -146,7 +146,7 @@ void LinearModelData::predict(
     const ColumnsWithTypeAndName & arguments,
     size_t offset,
     size_t limit,
-    const Context & context) const
+    ContextPtr context) const
 {
     gradient_computer->predict(container, arguments, offset, limit, weights, bias, context);
 }
@@ -453,7 +453,7 @@ void LogisticRegression::predict(
     size_t limit,
     const std::vector<Float64> & weights,
     Float64 bias,
-    const Context & /*context*/) const
+    ContextPtr /*context*/) const
 {
     size_t rows_num = arguments.front().column->size();
 
@@ -521,7 +521,7 @@ void LinearRegression::predict(
     size_t limit,
     const std::vector<Float64> & weights,
     Float64 bias,
-    const Context & /*context*/) const
+    ContextPtr /*context*/) const
 {
     if (weights.size() + 1 != arguments.size())
     {
diff --git a/src/AggregateFunctions/AggregateFunctionMLMethod.h b/src/AggregateFunctions/AggregateFunctionMLMethod.h
index 75fd269fe1b..6d97feb3193 100644
--- a/src/AggregateFunctions/AggregateFunctionMLMethod.h
+++ b/src/AggregateFunctions/AggregateFunctionMLMethod.h
@@ -3,10 +3,10 @@
 #include <Columns/ColumnVector.h>
 #include <Columns/ColumnsCommon.h>
 #include <Columns/ColumnsNumber.h>
-#include <Common/typeid_cast.h>
-#include <DataTypes/DataTypesNumber.h>
-#include <DataTypes/DataTypeTuple.h>
 #include <DataTypes/DataTypeArray.h>
+#include <DataTypes/DataTypeTuple.h>
+#include <DataTypes/DataTypesNumber.h>
+#include <Common/typeid_cast.h>
 #include "IAggregateFunction.h"
 
 namespace DB
@@ -44,7 +44,7 @@ public:
         size_t limit,
         const std::vector<Float64> & weights,
         Float64 bias,
-        const Context & context) const = 0;
+        ContextPtr context) const = 0;
 };
 
 
@@ -69,7 +69,7 @@ public:
         size_t limit,
         const std::vector<Float64> & weights,
         Float64 bias,
-        const Context & context) const override;
+        ContextPtr context) const override;
 };
 
 
@@ -94,7 +94,7 @@ public:
         size_t limit,
         const std::vector<Float64> & weights,
         Float64 bias,
-        const Context & context) const override;
+        ContextPtr context) const override;
 };
 
 
@@ -264,7 +264,7 @@ public:
         const ColumnsWithTypeAndName & arguments,
         size_t offset,
         size_t limit,
-        const Context & context) const;
+        ContextPtr context) const;
 
     void returnWeights(IColumn & to) const;
 private:
@@ -365,7 +365,7 @@ public:
         const ColumnsWithTypeAndName & arguments,
         size_t offset,
         size_t limit,
-        const Context & context) const override
+        ContextPtr context) const override
     {
         if (arguments.size() != param_num + 1)
             throw Exception(
diff --git a/src/AggregateFunctions/IAggregateFunction.h b/src/AggregateFunctions/IAggregateFunction.h
index 48f1d4bde31..dbb0a9f4349 100644
--- a/src/AggregateFunctions/IAggregateFunction.h
+++ b/src/AggregateFunctions/IAggregateFunction.h
@@ -1,21 +1,23 @@
 #pragma once
 
+#include <Columns/ColumnTuple.h>
+#include <Columns/ColumnsNumber.h>
+#include <Core/Block.h>
+#include <Core/ColumnNumbers.h>
+#include <Core/Field.h>
+#include <Interpreters/Context_fwd.h>
+#include <Common/Exception.h>
+#include <common/types.h>
+
 #include <cstddef>
 #include <memory>
 #include <type_traits>
 #include <vector>
 
-#include <common/types.h>
-#include <Common/Exception.h>
-#include <Core/Block.h>
-#include <Core/ColumnNumbers.h>
-#include <Core/Field.h>
-#include <Columns/ColumnTuple.h>
-#include <Columns/ColumnsNumber.h>
-
 
 namespace DB
 {
+
 namespace ErrorCodes
 {
     extern const int NOT_IMPLEMENTED;
@@ -122,7 +124,7 @@ public:
         const ColumnsWithTypeAndName & /*arguments*/,
         size_t /*offset*/,
         size_t /*limit*/,
-        const Context & /*context*/) const
+        ContextPtr /*context*/) const
     {
         throw Exception("Method predictValues is not supported for " + getName(), ErrorCodes::NOT_IMPLEMENTED);
     }
diff --git a/src/Bridge/IBridgeHelper.h b/src/Bridge/IBridgeHelper.h
index 4c540f221f8..3473e24047e 100644
--- a/src/Bridge/IBridgeHelper.h
+++ b/src/Bridge/IBridgeHelper.h
@@ -14,7 +14,7 @@ namespace DB
 
 /// Common base class for XDBC and Library bridge helpers.
 /// Contains helper methods to check/start bridge sync.
-class IBridgeHelper
+class IBridgeHelper: protected WithContext
 {
 
 public:
@@ -27,6 +27,7 @@ public:
     static const inline std::string PING_METHOD = Poco::Net::HTTPRequest::HTTP_GET;
     static const inline std::string MAIN_METHOD = Poco::Net::HTTPRequest::HTTP_POST;
 
+    explicit IBridgeHelper(ContextPtr context_) : WithContext(context_) {}
     virtual ~IBridgeHelper() = default;
 
     void startBridgeSync() const;
@@ -38,9 +39,9 @@ public:
 
 protected:
     /// clickhouse-odbc-bridge, clickhouse-library-bridge
-    virtual const String serviceAlias() const = 0;
+    virtual String serviceAlias() const = 0;
 
-    virtual const String serviceFileName() const = 0;
+    virtual String serviceFileName() const = 0;
 
     virtual size_t getDefaultPort() const = 0;
 
@@ -48,9 +49,7 @@ protected:
 
     virtual void startBridge(std::unique_ptr<ShellCommand> cmd) const = 0;
 
-    virtual const String configPrefix() const = 0;
-
-    virtual const Context & getContext() const = 0;
+    virtual String configPrefix() const = 0;
 
     virtual const Poco::Util::AbstractConfiguration & getConfig() const = 0;
 
diff --git a/src/Bridge/LibraryBridgeHelper.cpp b/src/Bridge/LibraryBridgeHelper.cpp
index 8ea1f783896..3ab01e18b11 100644
--- a/src/Bridge/LibraryBridgeHelper.cpp
+++ b/src/Bridge/LibraryBridgeHelper.cpp
@@ -21,14 +21,14 @@ namespace DB
 {
 
 LibraryBridgeHelper::LibraryBridgeHelper(
-        const Context & context_,
+        ContextPtr context_,
         const Block & sample_block_,
         const Field & dictionary_id_)
-    : log(&Poco::Logger::get("LibraryBridgeHelper"))
-    , context(context_)
+    : IBridgeHelper(context_)
+    , log(&Poco::Logger::get("LibraryBridgeHelper"))
     , sample_block(sample_block_)
-    , config(context.getConfigRef())
-    , http_timeout(context.getSettingsRef().http_receive_timeout.value.totalSeconds())
+    , config(context_->getConfigRef())
+    , http_timeout(context_->getSettingsRef().http_receive_timeout.value.totalSeconds())
     , dictionary_id(dictionary_id_)
 {
     bridge_port = config.getUInt("library_bridge.port", DEFAULT_PORT);
@@ -57,7 +57,7 @@ Poco::URI LibraryBridgeHelper::createBaseURI() const
 
 void LibraryBridgeHelper::startBridge(std::unique_ptr<ShellCommand> cmd) const
 {
-    context.addBridgeCommand(std::move(cmd));
+    getContext()->addBridgeCommand(std::move(cmd));
 }
 
 
@@ -68,7 +68,7 @@ bool LibraryBridgeHelper::initLibrary(const std::string & library_path, const st
 
     /// Sample block must contain null values
     WriteBufferFromOwnString out;
-    auto output_stream = context.getOutputStream(LibraryBridgeHelper::DEFAULT_FORMAT, out, sample_block);
+    auto output_stream = getContext()->getOutputStream(LibraryBridgeHelper::DEFAULT_FORMAT, out, sample_block);
     formatBlock(output_stream, sample_block);
     auto block_string = out.str();
 
@@ -142,8 +142,7 @@ BlockInputStreamPtr LibraryBridgeHelper::loadKeys(const Block & requested_block)
     ReadWriteBufferFromHTTP::OutStreamCallback out_stream_callback = [requested_block, this](std::ostream & os)
     {
         WriteBufferFromOStream out_buffer(os);
-        auto output_stream = context.getOutputStream(
-                LibraryBridgeHelper::DEFAULT_FORMAT, out_buffer, sample_block);
+        auto output_stream = getContext()->getOutputStream(LibraryBridgeHelper::DEFAULT_FORMAT, out_buffer, sample_block);
         formatBlock(output_stream, requested_block);
     };
     return loadBase(uri, out_stream_callback);
@@ -156,7 +155,7 @@ bool LibraryBridgeHelper::executeRequest(const Poco::URI & uri, ReadWriteBufferF
         uri,
         Poco::Net::HTTPRequest::HTTP_POST,
         std::move(out_stream_callback),
-        ConnectionTimeouts::getHTTPTimeouts(context));
+        ConnectionTimeouts::getHTTPTimeouts(getContext()));
 
     bool res;
     readBoolText(res, buf);
@@ -170,13 +169,13 @@ BlockInputStreamPtr LibraryBridgeHelper::loadBase(const Poco::URI & uri, ReadWri
         uri,
         Poco::Net::HTTPRequest::HTTP_POST,
         std::move(out_stream_callback),
-        ConnectionTimeouts::getHTTPTimeouts(context),
+        ConnectionTimeouts::getHTTPTimeouts(getContext()),
         0,
         Poco::Net::HTTPBasicCredentials{},
         DBMS_DEFAULT_BUFFER_SIZE,
         ReadWriteBufferFromHTTP::HTTPHeaderEntries{});
 
-    auto input_stream = context.getInputFormat(LibraryBridgeHelper::DEFAULT_FORMAT, *read_buf_ptr, sample_block, DEFAULT_BLOCK_SIZE);
+    auto input_stream = getContext()->getInputFormat(LibraryBridgeHelper::DEFAULT_FORMAT, *read_buf_ptr, sample_block, DEFAULT_BLOCK_SIZE);
     return std::make_shared<OwningBlockInputStream<ReadWriteBufferFromHTTP>>(input_stream, std::move(read_buf_ptr));
 }
 
diff --git a/src/Bridge/LibraryBridgeHelper.h b/src/Bridge/LibraryBridgeHelper.h
index 8803526f666..dc3f9020e71 100644
--- a/src/Bridge/LibraryBridgeHelper.h
+++ b/src/Bridge/LibraryBridgeHelper.h
@@ -17,9 +17,9 @@ class LibraryBridgeHelper : public IBridgeHelper
 public:
     static constexpr inline size_t DEFAULT_PORT = 9012;
 
-    LibraryBridgeHelper(const Context & context_, const Block & sample_block, const Field & dictionary_id_);
+    LibraryBridgeHelper(ContextPtr context_, const Block & sample_block, const Field & dictionary_id_);
 
-    bool initLibrary(const std::string & library_path, const std::string library_settings, const std::string attributes_names);
+    bool initLibrary(const std::string & library_path, std::string library_settings, std::string attributes_names);
 
     bool cloneLibrary(const Field & other_dictionary_id);
 
@@ -31,7 +31,7 @@ public:
 
     BlockInputStreamPtr loadAll();
 
-    BlockInputStreamPtr loadIds(const std::string ids_string);
+    BlockInputStreamPtr loadIds(std::string ids_string);
 
     BlockInputStreamPtr loadKeys(const Block & requested_block);
 
@@ -43,17 +43,15 @@ public:
 protected:
     void startBridge(std::unique_ptr<ShellCommand> cmd) const override;
 
-    const String serviceAlias() const override { return "clickhouse-library-bridge"; }
+    String serviceAlias() const override { return "clickhouse-library-bridge"; }
 
-    const String serviceFileName() const override { return serviceAlias(); }
+    String serviceFileName() const override { return serviceAlias(); }
 
     size_t getDefaultPort() const override { return DEFAULT_PORT; }
 
     bool startBridgeManually() const override { return false; }
 
-    const String configPrefix() const override { return "library_bridge"; }
-
-    const Context & getContext() const override { return context; }
+    String configPrefix() const override { return "library_bridge"; }
 
     const Poco::Util::AbstractConfiguration & getConfig() const override { return config; }
 
@@ -76,7 +74,6 @@ private:
     Poco::URI createRequestURI(const String & method) const;
 
     Poco::Logger * log;
-    const Context & context;
     const Block sample_block;
     const Poco::Util::AbstractConfiguration & config;
     const Poco::Timespan http_timeout;
@@ -85,4 +82,5 @@ private:
     std::string bridge_host;
     size_t bridge_port;
 };
+
 }
diff --git a/src/Bridge/XDBCBridgeHelper.h b/src/Bridge/XDBCBridgeHelper.h
index 50a54e0fd18..8a31171111d 100644
--- a/src/Bridge/XDBCBridgeHelper.h
+++ b/src/Bridge/XDBCBridgeHelper.h
@@ -35,6 +35,8 @@ class IXDBCBridgeHelper : public IBridgeHelper
 {
 
 public:
+    explicit IXDBCBridgeHelper(ContextPtr context_) : IBridgeHelper(context_) {}
+
     virtual std::vector<std::pair<std::string, std::string>> getURLParams(const std::string & cols, UInt64 max_block_size) const = 0;
 
     virtual Poco::URI getColumnsInfoURI() const = 0;
@@ -43,7 +45,7 @@ public:
 
     virtual bool isSchemaAllowed() = 0;
 
-    virtual const String getName() const = 0;
+    virtual String getName() const = 0;
 };
 
 using BridgeHelperPtr = std::shared_ptr<IXDBCBridgeHelper>;
@@ -60,14 +62,14 @@ public:
     static constexpr inline auto SCHEMA_ALLOWED_HANDLER = "/schema_allowed";
 
     XDBCBridgeHelper(
-            const Context & global_context_,
+            ContextPtr global_context_,
             const Poco::Timespan & http_timeout_,
             const std::string & connection_string_)
-    : log(&Poco::Logger::get(BridgeHelperMixin::getName() + "BridgeHelper"))
+    : IXDBCBridgeHelper(global_context_)
+    , log(&Poco::Logger::get(BridgeHelperMixin::getName() + "BridgeHelper"))
     , connection_string(connection_string_)
     , http_timeout(http_timeout_)
-    , context(global_context_)
-    , config(context.getConfigRef())
+    , config(global_context_->getConfigRef())
 {
     bridge_host = config.getString(BridgeHelperMixin::configPrefix() + ".host", DEFAULT_HOST);
     bridge_port = config.getUInt(BridgeHelperMixin::configPrefix() + ".port", DEFAULT_PORT);
@@ -77,18 +79,16 @@ public:
 protected:
     auto getConnectionString() const { return connection_string; }
 
-    const String getName() const override { return BridgeHelperMixin::getName(); }
+    String getName() const override { return BridgeHelperMixin::getName(); }
 
     size_t getDefaultPort() const override { return DEFAULT_PORT; }
 
-    const String serviceAlias() const override { return BridgeHelperMixin::serviceAlias(); }
+    String serviceAlias() const override { return BridgeHelperMixin::serviceAlias(); }
 
     /// Same for odbc and jdbc
-    const String serviceFileName() const override { return "clickhouse-odbc-bridge"; }
+    String serviceFileName() const override { return "clickhouse-odbc-bridge"; }
 
-    const String configPrefix() const override { return BridgeHelperMixin::configPrefix(); }
-
-    const Context & getContext() const override { return context; }
+    String configPrefix() const override { return BridgeHelperMixin::configPrefix(); }
 
     const Poco::Timespan & getHTTPTimeout() const override { return http_timeout; }
 
@@ -109,7 +109,7 @@ protected:
 
     void startBridge(std::unique_ptr<ShellCommand> cmd) const override
     {
-        context.addBridgeCommand(std::move(cmd));
+        getContext()->addBridgeCommand(std::move(cmd));
     }
 
 
@@ -122,7 +122,6 @@ private:
     std::string bridge_host;
     size_t bridge_port;
 
-    const Context & context;
     const Configuration & config;
 
     std::optional<IdentifierQuotingStyle> quote_style;
@@ -160,8 +159,7 @@ protected:
             uri.setPath(SCHEMA_ALLOWED_HANDLER);
             uri.addQueryParameter("connection_string", getConnectionString());
 
-            ReadWriteBufferFromHTTP buf(
-                uri, Poco::Net::HTTPRequest::HTTP_POST, {}, ConnectionTimeouts::getHTTPTimeouts(context));
+            ReadWriteBufferFromHTTP buf(uri, Poco::Net::HTTPRequest::HTTP_POST, {}, ConnectionTimeouts::getHTTPTimeouts(getContext()));
 
             bool res;
             readBoolText(res, buf);
@@ -181,12 +179,14 @@ protected:
             uri.setPath(IDENTIFIER_QUOTE_HANDLER);
             uri.addQueryParameter("connection_string", getConnectionString());
 
-            ReadWriteBufferFromHTTP buf(
-                uri, Poco::Net::HTTPRequest::HTTP_POST, {}, ConnectionTimeouts::getHTTPTimeouts(context));
+            ReadWriteBufferFromHTTP buf(uri, Poco::Net::HTTPRequest::HTTP_POST, {}, ConnectionTimeouts::getHTTPTimeouts(getContext()));
+
             std::string character;
             readStringBinary(character, buf);
             if (character.length() > 1)
-                throw Exception("Failed to parse quoting style from '" + character + "' for service " + BridgeHelperMixin::serviceAlias(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
+                throw Exception(
+                    "Failed to parse quoting style from '" + character + "' for service " + BridgeHelperMixin::serviceAlias(),
+                    ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
             else if (character.length() == 0)
                 quote_style = IdentifierQuotingStyle::None;
             else if (character[0] == '`')
@@ -206,17 +206,17 @@ struct JDBCBridgeMixin
 {
     static constexpr inline auto DEFAULT_PORT = 9019;
 
-    static const String configPrefix()
+    static String configPrefix()
     {
         return "jdbc_bridge";
     }
 
-    static const String serviceAlias()
+    static String serviceAlias()
     {
         return "clickhouse-jdbc-bridge";
     }
 
-    static const String getName()
+    static String getName()
     {
         return "JDBC";
     }
@@ -237,17 +237,17 @@ struct ODBCBridgeMixin
 {
     static constexpr inline auto DEFAULT_PORT = 9018;
 
-    static const String configPrefix()
+    static String configPrefix()
     {
         return "odbc_bridge";
     }
 
-    static const String serviceAlias()
+    static String serviceAlias()
     {
         return "clickhouse-odbc-bridge";
     }
 
-    static const String getName()
+    static String getName()
     {
         return "ODBC";
     }
diff --git a/src/Client/Connection.h b/src/Client/Connection.h
index 7e3b9b7ab61..65ed956a60b 100644
--- a/src/Client/Connection.h
+++ b/src/Client/Connection.h
@@ -21,6 +21,7 @@
 #include <IO/ReadBufferFromPocoSocket.h>
 
 #include <Interpreters/TablesStatus.h>
+#include <Interpreters/Context_fwd.h>
 
 #include <Compression/ICompressionCodec.h>
 
@@ -52,8 +53,6 @@ class Connection;
 using ConnectionPtr = std::shared_ptr<Connection>;
 using Connections = std::vector<ConnectionPtr>;
 
-using Scalars = std::map<String, Block>;
-
 
 /// Packet that could be received from server.
 struct Packet
@@ -111,7 +110,7 @@ public:
         setDescription();
     }
 
-    virtual ~Connection() {}
+    virtual ~Connection() = default;
 
     /// Set throttler of network traffic. One throttler could be used for multiple connections to limit total traffic.
     void setThrottler(const ThrottlerPtr & throttler_)
diff --git a/src/Columns/ColumnAggregateFunction.cpp b/src/Columns/ColumnAggregateFunction.cpp
index df7b3cce729..8178802f3bd 100644
--- a/src/Columns/ColumnAggregateFunction.cpp
+++ b/src/Columns/ColumnAggregateFunction.cpp
@@ -162,7 +162,7 @@ MutableColumnPtr ColumnAggregateFunction::convertToValues(MutableColumnPtr colum
     return res;
 }
 
-MutableColumnPtr ColumnAggregateFunction::predictValues(const ColumnsWithTypeAndName & arguments, const Context & context) const
+MutableColumnPtr ColumnAggregateFunction::predictValues(const ColumnsWithTypeAndName & arguments, ContextPtr context) const
 {
     MutableColumnPtr res = func->getReturnTypeToPredict()->createColumn();
     res->reserve(data.size());
diff --git a/src/Columns/ColumnAggregateFunction.h b/src/Columns/ColumnAggregateFunction.h
index 5cb9aaa4ad5..8eb1a04b174 100644
--- a/src/Columns/ColumnAggregateFunction.h
+++ b/src/Columns/ColumnAggregateFunction.h
@@ -82,7 +82,7 @@ private:
     /// Name of the type to distinguish different aggregation states.
     String type_string;
 
-    ColumnAggregateFunction() {}
+    ColumnAggregateFunction() = default;
 
     /// Create a new column that has another column as a source.
     MutablePtr createView() const;
@@ -119,7 +119,7 @@ public:
     const char * getFamilyName() const override { return "AggregateFunction"; }
     TypeIndex getDataType() const override { return TypeIndex::AggregateFunction; }
 
-    MutableColumnPtr predictValues(const ColumnsWithTypeAndName & arguments, const Context & context) const;
+    MutableColumnPtr predictValues(const ColumnsWithTypeAndName & arguments, ContextPtr context) const;
 
     size_t size() const override
     {
diff --git a/src/Common/CurrentThread.h b/src/Common/CurrentThread.h
index 7ab57ea7fab..069f9cf2af7 100644
--- a/src/Common/CurrentThread.h
+++ b/src/Common/CurrentThread.h
@@ -1,11 +1,12 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+#include <Common/ThreadStatus.h>
+#include <common/StringRef.h>
+
 #include <memory>
 #include <string>
 
-#include <common/StringRef.h>
-#include <Common/ThreadStatus.h>
-
 
 namespace ProfileEvents
 {
@@ -18,7 +19,6 @@ class MemoryTracker;
 namespace DB
 {
 
-class Context;
 class QueryStatus;
 struct Progress;
 class InternalTextLogsQueue;
@@ -87,7 +87,7 @@ public:
     /// Initializes query with current thread as master thread in constructor, and detaches it in destructor
     struct QueryScope
     {
-        explicit QueryScope(Context & query_context);
+        explicit QueryScope(ContextPtr query_context);
         ~QueryScope();
 
         void logPeakMemoryUsage();
@@ -99,7 +99,7 @@ private:
 
     /// Sets query_context for current thread group
     /// Can by used only through QueryScope
-    static void attachQueryContext(Context & query_context);
+    static void attachQueryContext(ContextPtr query_context);
 };
 
 }
diff --git a/src/Common/ThreadStatus.cpp b/src/Common/ThreadStatus.cpp
index 8c01ed2d46f..1493d30ea01 100644
--- a/src/Common/ThreadStatus.cpp
+++ b/src/Common/ThreadStatus.cpp
@@ -101,7 +101,8 @@ ThreadStatus::~ThreadStatus()
 
 #if !defined(ARCADIA_BUILD)
     /// It may cause segfault if query_context was destroyed, but was not detached
-    assert((!query_context && query_id.empty()) || (query_context && query_id == query_context->getCurrentQueryId()));
+    auto query_context_ptr = query_context.lock();
+    assert((!query_context_ptr && query_id.empty()) || (query_context_ptr && query_id == query_context_ptr->getCurrentQueryId()));
 #endif
 
     if (deleter)
diff --git a/src/Common/ThreadStatus.h b/src/Common/ThreadStatus.h
index dc5f09c5f3d..3b39e462fa6 100644
--- a/src/Common/ThreadStatus.h
+++ b/src/Common/ThreadStatus.h
@@ -1,20 +1,20 @@
 #pragma once
 
-#include <common/StringRef.h>
-#include <Common/ProfileEvents.h>
+#include <Core/SettingsEnums.h>
+#include <Interpreters/Context_fwd.h>
+#include <IO/Progress.h>
 #include <Common/MemoryTracker.h>
 #include <Common/OpenTelemetryTraceContext.h>
+#include <Common/ProfileEvents.h>
+#include <common/StringRef.h>
 
-#include <Core/SettingsEnums.h>
+#include <boost/noncopyable.hpp>
 
-#include <IO/Progress.h>
-
-#include <memory>
+#include <functional>
 #include <map>
+#include <memory>
 #include <mutex>
 #include <shared_mutex>
-#include <functional>
-#include <boost/noncopyable.hpp>
 
 
 namespace Poco
@@ -26,7 +26,6 @@ namespace Poco
 namespace DB
 {
 
-class Context;
 class QueryStatus;
 class ThreadStatus;
 class QueryProfilerReal;
@@ -58,8 +57,8 @@ public:
     ProfileEvents::Counters performance_counters{VariableContext::Process};
     MemoryTracker memory_tracker{VariableContext::Process};
 
-    Context * query_context = nullptr;
-    Context * global_context = nullptr;
+    ContextWeakPtr query_context;
+    ContextWeakPtr global_context;
 
     InternalTextLogsQueueWeakPtr logs_queue_ptr;
     std::function<void()> fatal_error_callback;
@@ -122,9 +121,9 @@ protected:
     std::atomic<int> thread_state{ThreadState::DetachedFromQuery};
 
     /// Is set once
-    Context * global_context = nullptr;
+    ContextWeakPtr global_context;
     /// Use it only from current thread
-    Context * query_context = nullptr;
+    ContextWeakPtr query_context;
 
     String query_id;
 
@@ -178,9 +177,9 @@ public:
         return query_id;
     }
 
-    const Context * getQueryContext() const
+    auto getQueryContext() const
     {
-        return query_context;
+        return query_context.lock();
     }
 
     /// Starts new query and create new thread group for it, current thread becomes master thread of the query
@@ -203,7 +202,7 @@ public:
 
     /// Sets query context for current master thread and its thread group
     /// NOTE: query_context have to be alive until detachQuery() is called
-    void attachQueryContext(Context & query_context);
+    void attachQueryContext(ContextPtr query_context);
 
     /// Update several ProfileEvents counters
     void updatePerformanceCounters();
diff --git a/src/Common/tests/gtest_global_context.h b/src/Common/tests/gtest_global_context.h
index b6529f09b46..30ebf1dbca9 100644
--- a/src/Common/tests/gtest_global_context.h
+++ b/src/Common/tests/gtest_global_context.h
@@ -5,14 +5,14 @@
 struct ContextHolder
 {
     DB::SharedContextHolder shared_context;
-    DB::Context context;
+    DB::ContextPtr context;
 
     ContextHolder()
         : shared_context(DB::Context::createShared())
         , context(DB::Context::createGlobal(shared_context.get()))
     {
-        context.makeGlobalContext();
-        context.setPath("./");
+        context->makeGlobalContext();
+        context->setPath("./");
     }
 
     ContextHolder(ContextHolder &&) = default;
diff --git a/src/Core/Block.h b/src/Core/Block.h
index 914d6b361b9..0cfd17b27dc 100644
--- a/src/Core/Block.h
+++ b/src/Core/Block.h
@@ -1,15 +1,15 @@
 #pragma once
 
-#include <vector>
-#include <list>
-#include <set>
-#include <map>
-#include <initializer_list>
-
 #include <Core/BlockInfo.h>
-#include <Core/NamesAndTypes.h>
 #include <Core/ColumnWithTypeAndName.h>
 #include <Core/ColumnsWithTypeAndName.h>
+#include <Core/NamesAndTypes.h>
+
+#include <initializer_list>
+#include <list>
+#include <map>
+#include <set>
+#include <vector>
 
 
 namespace DB
@@ -22,8 +22,6 @@ namespace DB
   * Allows to insert, remove columns in arbitrary position, to change order of columns.
   */
 
-class Context;
-
 class Block
 {
 private:
diff --git a/src/Core/BlockInfo.h b/src/Core/BlockInfo.h
index c8dd1576b22..125c90b1b23 100644
--- a/src/Core/BlockInfo.h
+++ b/src/Core/BlockInfo.h
@@ -1,9 +1,10 @@
 #pragma once
 
-#include <unordered_map>
-
 #include <common/types.h>
 
+#include <unordered_map>
+#include <vector>
+
 
 namespace DB
 {
diff --git a/src/Core/ExternalTable.cpp b/src/Core/ExternalTable.cpp
index afc9fe00ef5..87945dd1ce6 100644
--- a/src/Core/ExternalTable.cpp
+++ b/src/Core/ExternalTable.cpp
@@ -31,11 +31,11 @@ namespace ErrorCodes
 }
 
 
-ExternalTableDataPtr BaseExternalTable::getData(const Context & context)
+ExternalTableDataPtr BaseExternalTable::getData(ContextPtr context)
 {
     initReadBuffer();
     initSampleBlock();
-    auto input = context.getInputFormat(format, *read_buffer, sample_block, DEFAULT_BLOCK_SIZE);
+    auto input = context->getInputFormat(format, *read_buffer, sample_block, DEFAULT_BLOCK_SIZE);
     auto stream = std::make_shared<AsynchronousBlockInputStream>(input);
 
     auto data = std::make_unique<ExternalTableData>();
@@ -127,7 +127,7 @@ ExternalTable::ExternalTable(const boost::program_options::variables_map & exter
 
 void ExternalTablesHandler::handlePart(const Poco::Net::MessageHeader & header, ReadBuffer & stream)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
 
     if (settings.http_max_multipart_form_data_size)
         read_buffer = std::make_unique<LimitReadBuffer>(
@@ -152,14 +152,14 @@ void ExternalTablesHandler::handlePart(const Poco::Net::MessageHeader & header,
     else
         throw Exception("Neither structure nor types have not been provided for external table " + name + ". Use fields " + name + "_structure or " + name + "_types to do so.", ErrorCodes::BAD_ARGUMENTS);
 
-    ExternalTableDataPtr data = getData(context);
+    ExternalTableDataPtr data = getData(getContext());
 
     /// Create table
     NamesAndTypesList columns = sample_block.getNamesAndTypesList();
-    auto temporary_table = TemporaryTableHolder(context, ColumnsDescription{columns}, {});
+    auto temporary_table = TemporaryTableHolder(getContext(), ColumnsDescription{columns}, {});
     auto storage = temporary_table.getTable();
-    context.addExternalTable(data->table_name, std::move(temporary_table));
-    BlockOutputStreamPtr output = storage->write(ASTPtr(), storage->getInMemoryMetadataPtr(), context);
+    getContext()->addExternalTable(data->table_name, std::move(temporary_table));
+    BlockOutputStreamPtr output = storage->write(ASTPtr(), storage->getInMemoryMetadataPtr(), getContext());
 
     /// Write data
     data->pipe->resize(1);
diff --git a/src/Core/ExternalTable.h b/src/Core/ExternalTable.h
index aa15846d48a..fcefa3d7fe3 100644
--- a/src/Core/ExternalTable.h
+++ b/src/Core/ExternalTable.h
@@ -2,6 +2,7 @@
 
 #include <Client/Connection.h>
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 #include <IO/ReadBuffer.h>
 #include <Server/HTTP/HTMLForm.h>
 
@@ -11,30 +12,21 @@
 #include <vector>
 
 
-namespace Poco
+namespace Poco::Net
 {
-    namespace Net
-    {
-        class NameValueCollection;
-        class MessageHeader;
-    }
+class NameValueCollection;
+class MessageHeader;
 }
 
-namespace boost
+namespace boost::program_options
 {
-    namespace program_options
-    {
-        class variables_map;
-    }
+class variables_map;
 }
 
 
 namespace DB
 {
 
-class Context;
-
-
 /// The base class containing the basic information about external table and
 /// basic functions for extracting this information from text fields.
 class BaseExternalTable
@@ -56,7 +48,7 @@ public:
     virtual void initReadBuffer() {}
 
     /// Get the table data - a pair (a stream with the contents of the table, the name of the table)
-    ExternalTableDataPtr getData(const Context & context);
+    ExternalTableDataPtr getData(ContextPtr context);
 
 protected:
     /// Clear all accumulated information
@@ -88,15 +80,14 @@ public:
 /// Parsing of external table used when sending tables via http
 /// The `handlePart` function will be called for each table passed,
 /// so it's also necessary to call `clean` at the end of the `handlePart`.
-class ExternalTablesHandler : public HTMLForm::PartHandler, BaseExternalTable
+class ExternalTablesHandler : public HTMLForm::PartHandler, BaseExternalTable, WithContext
 {
 public:
-    ExternalTablesHandler(Context & context_, const Poco::Net::NameValueCollection & params_) : context(context_), params(params_) {}
+    ExternalTablesHandler(ContextPtr context_, const Poco::Net::NameValueCollection & params_) : WithContext(context_), params(params_) {}
 
     void handlePart(const Poco::Net::MessageHeader & header, ReadBuffer & stream) override;
 
 private:
-    Context & context;
     const Poco::Net::NameValueCollection & params;
 };
 
diff --git a/src/Core/MySQL/Authentication.cpp b/src/Core/MySQL/Authentication.cpp
index e685ad0394d..b8dff9972c7 100644
--- a/src/Core/MySQL/Authentication.cpp
+++ b/src/Core/MySQL/Authentication.cpp
@@ -73,7 +73,7 @@ Native41::Native41(const String & password, const String & auth_plugin_data)
 }
 
 void Native41::authenticate(
-    const String & user_name, std::optional<String> auth_response, Context & context,
+    const String & user_name, std::optional<String> auth_response, ContextPtr context,
     std::shared_ptr<PacketEndpoint> packet_endpoint, bool, const Poco::Net::SocketAddress & address)
 {
     if (!auth_response)
@@ -86,15 +86,17 @@ void Native41::authenticate(
 
     if (auth_response->empty())
     {
-        context.setUser(user_name, "", address);
+        context->setUser(user_name, "", address);
         return;
     }
 
     if (auth_response->size() != Poco::SHA1Engine::DIGEST_SIZE)
-        throw Exception("Wrong size of auth response. Expected: " + std::to_string(Poco::SHA1Engine::DIGEST_SIZE) + " bytes, received: " + std::to_string(auth_response->size()) + " bytes.",
-                        ErrorCodes::UNKNOWN_EXCEPTION);
+        throw Exception(
+            "Wrong size of auth response. Expected: " + std::to_string(Poco::SHA1Engine::DIGEST_SIZE)
+                + " bytes, received: " + std::to_string(auth_response->size()) + " bytes.",
+            ErrorCodes::UNKNOWN_EXCEPTION);
 
-    auto user = context.getAccessControlManager().read<User>(user_name);
+    auto user = context->getAccessControlManager().read<User>(user_name);
 
     Poco::SHA1Engine::Digest double_sha1_value = user->authentication.getPasswordDoubleSHA1();
     assert(double_sha1_value.size() == Poco::SHA1Engine::DIGEST_SIZE);
@@ -109,7 +111,7 @@ void Native41::authenticate(
     {
         password_sha1[i] = digest[i] ^ static_cast<unsigned char>((*auth_response)[i]);
     }
-    context.setUser(user_name, password_sha1, address);
+    context->setUser(user_name, password_sha1, address);
 }
 
 #if USE_SSL
@@ -134,7 +136,7 @@ Sha256Password::Sha256Password(RSA & public_key_, RSA & private_key_, Poco::Logg
 }
 
 void Sha256Password::authenticate(
-    const String & user_name, std::optional<String> auth_response, Context & context,
+    const String & user_name, std::optional<String> auth_response, ContextPtr context,
     std::shared_ptr<PacketEndpoint> packet_endpoint, bool is_secure_connection, const Poco::Net::SocketAddress & address)
 {
     if (!auth_response)
@@ -229,7 +231,7 @@ void Sha256Password::authenticate(
         password.pop_back();
     }
 
-    context.setUser(user_name, password, address);
+    context->setUser(user_name, password, address);
 }
 
 #endif
diff --git a/src/Core/MySQL/Authentication.h b/src/Core/MySQL/Authentication.h
index e1b7c174139..5358e2da737 100644
--- a/src/Core/MySQL/Authentication.h
+++ b/src/Core/MySQL/Authentication.h
@@ -32,7 +32,7 @@ public:
     virtual String getAuthPluginData() = 0;
 
     virtual void authenticate(
-        const String & user_name, std::optional<String> auth_response, Context & context,
+        const String & user_name, std::optional<String> auth_response, ContextPtr context,
         std::shared_ptr<PacketEndpoint> packet_endpoint, bool is_secure_connection, const Poco::Net::SocketAddress & address) = 0;
 };
 
@@ -49,7 +49,7 @@ public:
     String getAuthPluginData() override { return scramble; }
 
     void authenticate(
-        const String & user_name, std::optional<String> auth_response, Context & context,
+        const String & user_name, std::optional<String> auth_response, ContextPtr context,
         std::shared_ptr<PacketEndpoint> packet_endpoint, bool /* is_secure_connection */, const Poco::Net::SocketAddress & address) override;
 
 private:
@@ -69,7 +69,7 @@ public:
     String getAuthPluginData() override { return scramble; }
 
     void authenticate(
-        const String & user_name, std::optional<String> auth_response, Context & context,
+        const String & user_name, std::optional<String> auth_response, ContextPtr context,
         std::shared_ptr<PacketEndpoint> packet_endpoint, bool is_secure_connection, const Poco::Net::SocketAddress & address) override;
 
 private:
diff --git a/src/Core/PostgreSQLProtocol.h b/src/Core/PostgreSQLProtocol.h
index 471811e969b..62b87e78642 100644
--- a/src/Core/PostgreSQLProtocol.h
+++ b/src/Core/PostgreSQLProtocol.h
@@ -797,15 +797,15 @@ namespace PGAuthentication
 class AuthenticationMethod
 {
 protected:
-    void setPassword(
+    static void setPassword(
         const String & user_name,
         const String & password,
-        Context & context,
+        ContextPtr context,
         Messaging::MessageTransport & mt,
         const Poco::Net::SocketAddress & address)
     {
         try {
-            context.setUser(user_name, password, address);
+            context->setUser(user_name, password, address);
         }
         catch (const Exception &)
         {
@@ -819,7 +819,7 @@ protected:
 public:
     virtual void authenticate(
         const String & user_name,
-        Context & context,
+        ContextPtr context,
         Messaging::MessageTransport & mt,
         const Poco::Net::SocketAddress & address) = 0;
 
@@ -833,7 +833,7 @@ class NoPasswordAuth : public AuthenticationMethod
 public:
     void authenticate(
         const String & /* user_name */,
-        Context & /* context */,
+        ContextPtr /* context */,
         Messaging::MessageTransport & /* mt */,
         const Poco::Net::SocketAddress & /* address */) override {}
 
@@ -848,7 +848,7 @@ class CleartextPasswordAuth : public AuthenticationMethod
 public:
     void authenticate(
         const String & user_name,
-        Context & context,
+        ContextPtr context,
         Messaging::MessageTransport & mt,
         const Poco::Net::SocketAddress & address) override
     {
@@ -891,11 +891,11 @@ public:
 
     void authenticate(
         const String & user_name,
-        Context & context,
+        ContextPtr context,
         Messaging::MessageTransport & mt,
         const Poco::Net::SocketAddress & address)
     {
-        auto user = context.getAccessControlManager().read<User>(user_name);
+        auto user = context->getAccessControlManager().read<User>(user_name);
         Authentication::Type user_auth_type = user->authentication.getType();
 
         if (type_to_method.find(user_auth_type) != type_to_method.end())
diff --git a/src/DataStreams/AddingDefaultBlockOutputStream.cpp b/src/DataStreams/AddingDefaultBlockOutputStream.cpp
index f241d417205..f4d8f6954c1 100644
--- a/src/DataStreams/AddingDefaultBlockOutputStream.cpp
+++ b/src/DataStreams/AddingDefaultBlockOutputStream.cpp
@@ -10,7 +10,7 @@ AddingDefaultBlockOutputStream::AddingDefaultBlockOutputStream(
     const BlockOutputStreamPtr & output_,
     const Block & header_,
     const ColumnsDescription & columns_,
-    const Context & context_)
+    ContextPtr context_)
     : output(output_), header(header_)
 {
     auto dag = addMissingDefaults(header_, output->getHeader().getNamesAndTypesList(), columns_, context_);
diff --git a/src/DataStreams/AddingDefaultBlockOutputStream.h b/src/DataStreams/AddingDefaultBlockOutputStream.h
index 5fbbe2aed60..a8235d6623a 100644
--- a/src/DataStreams/AddingDefaultBlockOutputStream.h
+++ b/src/DataStreams/AddingDefaultBlockOutputStream.h
@@ -26,7 +26,7 @@ public:
         const BlockOutputStreamPtr & output_,
         const Block & header_,
         const ColumnsDescription & columns_,
-        const Context & context_);
+        ContextPtr context_);
 
     Block getHeader() const override { return header; }
     void write(const Block & block) override;
diff --git a/src/DataStreams/AddingDefaultsBlockInputStream.cpp b/src/DataStreams/AddingDefaultsBlockInputStream.cpp
index 81408b0aaa6..e3f0906cb03 100644
--- a/src/DataStreams/AddingDefaultsBlockInputStream.cpp
+++ b/src/DataStreams/AddingDefaultsBlockInputStream.cpp
@@ -130,7 +130,7 @@ static MutableColumnPtr mixColumns(const ColumnWithTypeAndName & col_read,
 AddingDefaultsBlockInputStream::AddingDefaultsBlockInputStream(
     const BlockInputStreamPtr & input,
     const ColumnsDescription & columns_,
-    const Context & context_)
+    ContextPtr context_)
     : columns(columns_)
     , column_defaults(columns.getDefaults())
     , context(context_)
diff --git a/src/DataStreams/AddingDefaultsBlockInputStream.h b/src/DataStreams/AddingDefaultsBlockInputStream.h
index b2efa5863ef..957f14caff3 100644
--- a/src/DataStreams/AddingDefaultsBlockInputStream.h
+++ b/src/DataStreams/AddingDefaultsBlockInputStream.h
@@ -7,8 +7,6 @@
 namespace DB
 {
 
-class Context;
-
 /// Adds defaults to columns using BlockDelayedDefaults bitmask attached to Block by child InputStream.
 class AddingDefaultsBlockInputStream : public IBlockInputStream
 {
@@ -16,7 +14,7 @@ public:
     AddingDefaultsBlockInputStream(
         const BlockInputStreamPtr & input,
         const ColumnsDescription & columns_,
-        const Context & context_);
+        ContextPtr context_);
 
     String getName() const override { return "AddingDefaults"; }
     Block getHeader() const override { return header; }
@@ -28,7 +26,7 @@ private:
     Block header;
     const ColumnsDescription columns;
     const ColumnDefaults column_defaults;
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/DataStreams/BlockIO.h b/src/DataStreams/BlockIO.h
index 91d7efac8d1..31a0e1020d2 100644
--- a/src/DataStreams/BlockIO.h
+++ b/src/DataStreams/BlockIO.h
@@ -50,7 +50,7 @@ struct BlockIO
         }
     }
 
-    void onException()
+    void onException() const
     {
         if (exception_callback)
             exception_callback();
diff --git a/src/DataStreams/CheckConstraintsBlockOutputStream.cpp b/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
index 3b0b4db72f9..c4556162323 100644
--- a/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
+++ b/src/DataStreams/CheckConstraintsBlockOutputStream.cpp
@@ -27,7 +27,7 @@ CheckConstraintsBlockOutputStream::CheckConstraintsBlockOutputStream(
     const BlockOutputStreamPtr & output_,
     const Block & header_,
     const ConstraintsDescription & constraints_,
-    const Context & context_)
+    ContextPtr context_)
     : table_id(table_id_),
     output(output_),
     header(header_),
diff --git a/src/DataStreams/CheckConstraintsBlockOutputStream.h b/src/DataStreams/CheckConstraintsBlockOutputStream.h
index a1be720f21e..0f115550eb8 100644
--- a/src/DataStreams/CheckConstraintsBlockOutputStream.h
+++ b/src/DataStreams/CheckConstraintsBlockOutputStream.h
@@ -20,7 +20,7 @@ public:
             const BlockOutputStreamPtr & output_,
             const Block & header_,
             const ConstraintsDescription & constraints_,
-            const Context & context_);
+            ContextPtr context_);
 
     Block getHeader() const override { return header; }
     void write(const Block & block) override;
diff --git a/src/DataStreams/IBlockInputStream.h b/src/DataStreams/IBlockInputStream.h
index 4e314ef2980..b077f87e8a8 100644
--- a/src/DataStreams/IBlockInputStream.h
+++ b/src/DataStreams/IBlockInputStream.h
@@ -2,9 +2,8 @@
 
 #include <Core/Block.h>
 #include <DataStreams/BlockStreamProfileInfo.h>
-#include <DataStreams/IBlockStream_fwd.h>
-#include <DataStreams/SizeLimits.h>
 #include <DataStreams/ExecutionSpeedLimits.h>
+#include <DataStreams/SizeLimits.h>
 #include <DataStreams/StreamLocalLimits.h>
 #include <IO/Progress.h>
 #include <Storages/TableLockHolder.h>
diff --git a/src/DataStreams/InputStreamFromASTInsertQuery.cpp b/src/DataStreams/InputStreamFromASTInsertQuery.cpp
index 70d69227ac0..0848d838276 100644
--- a/src/DataStreams/InputStreamFromASTInsertQuery.cpp
+++ b/src/DataStreams/InputStreamFromASTInsertQuery.cpp
@@ -24,7 +24,7 @@ InputStreamFromASTInsertQuery::InputStreamFromASTInsertQuery(
     const ASTPtr & ast,
     ReadBuffer * input_buffer_tail_part,
     const Block & header,
-    const Context & context,
+    ContextPtr context,
     const ASTPtr & input_function)
 {
     const auto * ast_insert_query = ast->as<ASTInsertQuery>();
@@ -58,9 +58,9 @@ InputStreamFromASTInsertQuery::InputStreamFromASTInsertQuery(
 
     input_buffer_contacenated = std::make_unique<ConcatReadBuffer>(buffers);
 
-    res_stream = context.getInputFormat(format, *input_buffer_contacenated, header, context.getSettings().max_insert_block_size);
+    res_stream = context->getInputFormat(format, *input_buffer_contacenated, header, context->getSettings().max_insert_block_size);
 
-    if (context.getSettingsRef().input_format_defaults_for_omitted_fields && ast_insert_query->table_id && !input_function)
+    if (context->getSettingsRef().input_format_defaults_for_omitted_fields && ast_insert_query->table_id && !input_function)
     {
         StoragePtr storage = DatabaseCatalog::instance().getTable(ast_insert_query->table_id, context);
         auto metadata_snapshot = storage->getInMemoryMetadataPtr();
diff --git a/src/DataStreams/InputStreamFromASTInsertQuery.h b/src/DataStreams/InputStreamFromASTInsertQuery.h
index d4c6443c77d..15b698a2d68 100644
--- a/src/DataStreams/InputStreamFromASTInsertQuery.h
+++ b/src/DataStreams/InputStreamFromASTInsertQuery.h
@@ -25,7 +25,7 @@ public:
         const ASTPtr & ast,
         ReadBuffer * input_buffer_tail_part,
         const Block & header,
-        const Context & context,
+        ContextPtr context,
         const ASTPtr & input_function);
 
     Block readImpl() override { return res_stream->read(); }
diff --git a/src/DataStreams/PushingToViewsBlockOutputStream.cpp b/src/DataStreams/PushingToViewsBlockOutputStream.cpp
index 4d1990ffe18..56100205b0d 100644
--- a/src/DataStreams/PushingToViewsBlockOutputStream.cpp
+++ b/src/DataStreams/PushingToViewsBlockOutputStream.cpp
@@ -26,13 +26,13 @@ namespace DB
 PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
     const StoragePtr & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
-    const Context & context_,
+    ContextPtr context_,
     const ASTPtr & query_ptr_,
     bool no_destination)
-    : storage(storage_)
+    : WithContext(context_)
+    , storage(storage_)
     , metadata_snapshot(metadata_snapshot_)
     , log(&Poco::Logger::get("PushingToViewsBlockOutputStream"))
-    , context(context_)
     , query_ptr(query_ptr_)
 {
     checkStackSize();
@@ -42,12 +42,12 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
       *  but it's clear that here is not the best place for this functionality.
       */
     addTableLock(
-        storage->lockForShare(context.getInitialQueryId(), context.getSettingsRef().lock_acquire_timeout));
+        storage->lockForShare(getContext()->getInitialQueryId(), getContext()->getSettingsRef().lock_acquire_timeout));
 
     /// If the "root" table deduplicates blocks, there are no need to make deduplication for children
     /// Moreover, deduplication for AggregatingMergeTree children could produce false positives due to low size of inserting blocks
     bool disable_deduplication_for_children = false;
-    if (!context.getSettingsRef().deduplicate_blocks_in_dependent_materialized_views)
+    if (!getContext()->getSettingsRef().deduplicate_blocks_in_dependent_materialized_views)
         disable_deduplication_for_children = !no_destination && storage->supportsDeduplication();
 
     auto table_id = storage->getStorageID();
@@ -56,8 +56,8 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
     /// We need special context for materialized views insertions
     if (!dependencies.empty())
     {
-        select_context = std::make_unique<Context>(context);
-        insert_context = std::make_unique<Context>(context);
+        select_context = Context::createCopy(context);
+        insert_context = Context::createCopy(context);
 
         const auto & insert_settings = insert_context->getSettingsRef();
 
@@ -74,7 +74,7 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
 
     for (const auto & database_table : dependencies)
     {
-        auto dependent_table = DatabaseCatalog::instance().getTable(database_table, context);
+        auto dependent_table = DatabaseCatalog::instance().getTable(database_table, getContext());
         auto dependent_metadata_snapshot = dependent_table->getInMemoryMetadataPtr();
 
         ASTPtr query;
@@ -83,7 +83,7 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
         if (auto * materialized_view = dynamic_cast<StorageMaterializedView *>(dependent_table.get()))
         {
             addTableLock(
-                materialized_view->lockForShare(context.getInitialQueryId(), context.getSettingsRef().lock_acquire_timeout));
+                materialized_view->lockForShare(getContext()->getInitialQueryId(), getContext()->getSettingsRef().lock_acquire_timeout));
 
             StoragePtr inner_table = materialized_view->getTargetTable();
             auto inner_table_id = inner_table->getStorageID();
@@ -94,7 +94,7 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
             insert->table_id = inner_table_id;
 
             /// Get list of columns we get from select query.
-            auto header = InterpreterSelectQuery(query, *select_context, SelectQueryOptions().analyze())
+            auto header = InterpreterSelectQuery(query, select_context, SelectQueryOptions().analyze())
                 .getSampleBlock();
 
             /// Insert only columns returned by select.
@@ -110,16 +110,16 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
             insert->columns = std::move(list);
 
             ASTPtr insert_query_ptr(insert.release());
-            InterpreterInsertQuery interpreter(insert_query_ptr, *insert_context);
+            InterpreterInsertQuery interpreter(insert_query_ptr, insert_context);
             BlockIO io = interpreter.execute();
             out = io.out;
         }
         else if (dynamic_cast<const StorageLiveView *>(dependent_table.get()))
             out = std::make_shared<PushingToViewsBlockOutputStream>(
-                dependent_table, dependent_metadata_snapshot, *insert_context, ASTPtr(), true);
+                dependent_table, dependent_metadata_snapshot, insert_context, ASTPtr(), true);
         else
             out = std::make_shared<PushingToViewsBlockOutputStream>(
-                dependent_table, dependent_metadata_snapshot, *insert_context, ASTPtr());
+                dependent_table, dependent_metadata_snapshot, insert_context, ASTPtr());
 
         views.emplace_back(ViewInfo{std::move(query), database_table, std::move(out), nullptr, 0 /* elapsed_ms */});
     }
@@ -127,7 +127,7 @@ PushingToViewsBlockOutputStream::PushingToViewsBlockOutputStream(
     /// Do not push to destination table if the flag is set
     if (!no_destination)
     {
-        output = storage->write(query_ptr, storage->getInMemoryMetadataPtr(), context);
+        output = storage->write(query_ptr, storage->getInMemoryMetadataPtr(), getContext());
         replicated_output = dynamic_cast<ReplicatedMergeTreeBlockOutputStream *>(output.get());
     }
 }
@@ -155,7 +155,7 @@ void PushingToViewsBlockOutputStream::write(const Block & block)
 
     if (auto * live_view = dynamic_cast<StorageLiveView *>(storage.get()))
     {
-        StorageLiveView::writeIntoLiveView(*live_view, block, context);
+        StorageLiveView::writeIntoLiveView(*live_view, block, getContext());
     }
     else
     {
@@ -166,11 +166,11 @@ void PushingToViewsBlockOutputStream::write(const Block & block)
     }
 
     /// Don't process materialized views if this block is duplicate
-    if (!context.getSettingsRef().deduplicate_blocks_in_dependent_materialized_views && replicated_output && replicated_output->lastBlockIsDuplicate())
+    if (!getContext()->getSettingsRef().deduplicate_blocks_in_dependent_materialized_views && replicated_output && replicated_output->lastBlockIsDuplicate())
         return;
 
     // Insert data into materialized views only after successful insert into main table
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
     if (settings.parallel_view_processing && views.size() > 1)
     {
         // Push to views concurrently if enabled and more than one view is attached
@@ -228,7 +228,7 @@ void PushingToViewsBlockOutputStream::writeSuffix()
 
     std::exception_ptr first_exception;
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
     bool parallel_processing = false;
 
     /// Run writeSuffix() for views in separate thread pool.
@@ -353,10 +353,9 @@ void PushingToViewsBlockOutputStream::process(const Block & block, ViewInfo & vi
             ///  but it will contain single block (that is INSERT-ed into main table).
             /// InterpreterSelectQuery will do processing of alias columns.
 
-            Context local_context = *select_context;
-            local_context.addViewSource(
-                StorageValues::create(
-                    storage->getStorageID(), metadata_snapshot->getColumns(), block, storage->getVirtuals()));
+            auto local_context = Context::createCopy(select_context);
+            local_context->addViewSource(
+                StorageValues::create(storage->getStorageID(), metadata_snapshot->getColumns(), block, storage->getVirtuals()));
             select.emplace(view.query, local_context, SelectQueryOptions());
             in = std::make_shared<MaterializingBlockInputStream>(select->execute().getInputStream());
 
@@ -364,7 +363,7 @@ void PushingToViewsBlockOutputStream::process(const Block & block, ViewInfo & vi
             /// even when only one block is inserted into the parent table (e.g. if the query is a GROUP BY
             /// and two-level aggregation is triggered).
             in = std::make_shared<SquashingBlockInputStream>(
-                    in, context.getSettingsRef().min_insert_block_size_rows, context.getSettingsRef().min_insert_block_size_bytes);
+                    in, getContext()->getSettingsRef().min_insert_block_size_rows, getContext()->getSettingsRef().min_insert_block_size_bytes);
             in = std::make_shared<ConvertingBlockInputStream>(in, view.out->getHeader(), ConvertingBlockInputStream::MatchColumnsMode::Name);
         }
         else
diff --git a/src/DataStreams/PushingToViewsBlockOutputStream.h b/src/DataStreams/PushingToViewsBlockOutputStream.h
index 6b32607b294..2ae941efc2e 100644
--- a/src/DataStreams/PushingToViewsBlockOutputStream.h
+++ b/src/DataStreams/PushingToViewsBlockOutputStream.h
@@ -1,9 +1,9 @@
 #pragma once
 
 #include <DataStreams/IBlockOutputStream.h>
-#include <Common/Stopwatch.h>
 #include <Parsers/IAST_fwd.h>
 #include <Storages/IStorage.h>
+#include <Common/Stopwatch.h>
 
 namespace Poco
 {
@@ -14,18 +14,16 @@ namespace DB
 {
 
 class ReplicatedMergeTreeBlockOutputStream;
-class Context;
-
 
 /** Writes data to the specified table and to all dependent materialized views.
   */
-class PushingToViewsBlockOutputStream : public IBlockOutputStream
+class PushingToViewsBlockOutputStream : public IBlockOutputStream, WithContext
 {
 public:
     PushingToViewsBlockOutputStream(
         const StoragePtr & storage_,
         const StorageMetadataPtr & metadata_snapshot_,
-        const Context & context_,
+        ContextPtr context_,
         const ASTPtr & query_ptr_,
         bool no_destination = false);
 
@@ -43,7 +41,6 @@ private:
     ReplicatedMergeTreeBlockOutputStream * replicated_output = nullptr;
     Poco::Logger * log;
 
-    const Context & context;
     ASTPtr query_ptr;
     Stopwatch main_watch;
 
@@ -57,8 +54,8 @@ private:
     };
 
     std::vector<ViewInfo> views;
-    std::unique_ptr<Context> select_context;
-    std::unique_ptr<Context> insert_context;
+    ContextPtr select_context;
+    ContextPtr insert_context;
 
     void process(const Block & block, ViewInfo & view);
 };
diff --git a/src/DataStreams/RemoteBlockInputStream.cpp b/src/DataStreams/RemoteBlockInputStream.cpp
index a62f7fca0b7..c633600d37f 100644
--- a/src/DataStreams/RemoteBlockInputStream.cpp
+++ b/src/DataStreams/RemoteBlockInputStream.cpp
@@ -6,7 +6,7 @@ namespace DB
 
 RemoteBlockInputStream::RemoteBlockInputStream(
         Connection & connection,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         const ThrottlerPtr & throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
     : query_executor(connection, query_, header_, context_, throttler, scalars_, external_tables_, stage_)
 {
@@ -15,7 +15,7 @@ RemoteBlockInputStream::RemoteBlockInputStream(
 
 RemoteBlockInputStream::RemoteBlockInputStream(
         std::vector<IConnectionPool::Entry> && connections,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         const ThrottlerPtr & throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
     : query_executor(std::move(connections), query_, header_, context_, throttler, scalars_, external_tables_, stage_)
 {
@@ -24,7 +24,7 @@ RemoteBlockInputStream::RemoteBlockInputStream(
 
 RemoteBlockInputStream::RemoteBlockInputStream(
         const ConnectionPoolWithFailoverPtr & pool,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         const ThrottlerPtr & throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
     : query_executor(pool, query_, header_, context_, throttler, scalars_, external_tables_, stage_)
 {
diff --git a/src/DataStreams/RemoteBlockInputStream.h b/src/DataStreams/RemoteBlockInputStream.h
index 5ef05ee99eb..b0029da91bb 100644
--- a/src/DataStreams/RemoteBlockInputStream.h
+++ b/src/DataStreams/RemoteBlockInputStream.h
@@ -25,21 +25,21 @@ public:
     /// Takes already set connection.
     RemoteBlockInputStream(
             Connection & connection,
-            const String & query_, const Block & header_, const Context & context_,
+            const String & query_, const Block & header_, ContextPtr context_,
             const ThrottlerPtr & throttler = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
             QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
     /// Accepts several connections already taken from pool.
     RemoteBlockInputStream(
             std::vector<IConnectionPool::Entry> && connections,
-            const String & query_, const Block & header_, const Context & context_,
+            const String & query_, const Block & header_, ContextPtr context_,
             const ThrottlerPtr & throttler = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
             QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
     /// Takes a pool and gets one or several connections from it.
     RemoteBlockInputStream(
             const ConnectionPoolWithFailoverPtr & pool,
-            const String & query_, const Block & header_, const Context & context_,
+            const String & query_, const Block & header_, ContextPtr context_,
             const ThrottlerPtr & throttler = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
             QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
diff --git a/src/DataStreams/RemoteQueryExecutor.cpp b/src/DataStreams/RemoteQueryExecutor.cpp
index 9cac638ceb5..4aa659854b9 100644
--- a/src/DataStreams/RemoteQueryExecutor.cpp
+++ b/src/DataStreams/RemoteQueryExecutor.cpp
@@ -28,41 +28,51 @@ namespace ErrorCodes
 
 RemoteQueryExecutor::RemoteQueryExecutor(
     Connection & connection,
-    const String & query_, const Block & header_, const Context & context_,
-    ThrottlerPtr throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
-    : header(header_), query(query_), context(context_)
-    , scalars(scalars_), external_tables(external_tables_), stage(stage_)
+    const String & query_,
+    const Block & header_,
+    ContextPtr context_,
+    ThrottlerPtr throttler,
+    const Scalars & scalars_,
+    const Tables & external_tables_,
+    QueryProcessingStage::Enum stage_)
+    : header(header_), query(query_), context(context_), scalars(scalars_), external_tables(external_tables_), stage(stage_)
 {
     create_connections = [this, &connection, throttler]()
     {
-        return std::make_unique<MultiplexedConnections>(connection, context.getSettingsRef(), throttler);
+        return std::make_unique<MultiplexedConnections>(connection, context->getSettingsRef(), throttler);
     };
 }
 
 RemoteQueryExecutor::RemoteQueryExecutor(
     std::vector<IConnectionPool::Entry> && connections_,
-    const String & query_, const Block & header_, const Context & context_,
-    const ThrottlerPtr & throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
-    : header(header_), query(query_), context(context_)
-    , scalars(scalars_), external_tables(external_tables_), stage(stage_)
+    const String & query_,
+    const Block & header_,
+    ContextPtr context_,
+    const ThrottlerPtr & throttler,
+    const Scalars & scalars_,
+    const Tables & external_tables_,
+    QueryProcessingStage::Enum stage_)
+    : header(header_), query(query_), context(context_), scalars(scalars_), external_tables(external_tables_), stage(stage_)
 {
-    create_connections = [this, connections_, throttler]() mutable
-    {
-        return std::make_unique<MultiplexedConnections>(
-                std::move(connections_), context.getSettingsRef(), throttler);
+    create_connections = [this, connections_, throttler]() mutable {
+        return std::make_unique<MultiplexedConnections>(std::move(connections_), context->getSettingsRef(), throttler);
     };
 }
 
 RemoteQueryExecutor::RemoteQueryExecutor(
     const ConnectionPoolWithFailoverPtr & pool,
-    const String & query_, const Block & header_, const Context & context_,
-    const ThrottlerPtr & throttler, const Scalars & scalars_, const Tables & external_tables_, QueryProcessingStage::Enum stage_)
-    : header(header_), query(query_), context(context_)
-    , scalars(scalars_), external_tables(external_tables_), stage(stage_)
+    const String & query_,
+    const Block & header_,
+    ContextPtr context_,
+    const ThrottlerPtr & throttler,
+    const Scalars & scalars_,
+    const Tables & external_tables_,
+    QueryProcessingStage::Enum stage_)
+    : header(header_), query(query_), context(context_), scalars(scalars_), external_tables(external_tables_), stage(stage_)
 {
     create_connections = [this, pool, throttler]()->std::unique_ptr<IConnections>
     {
-        const Settings & current_settings = context.getSettingsRef();
+        const Settings & current_settings = context->getSettingsRef();
         auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(current_settings);
 
 #if defined(OS_LINUX)
@@ -157,7 +167,7 @@ void RemoteQueryExecutor::sendQuery()
 
     connections = create_connections();
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
     if (settings.skip_unavailable_shards && 0 == connections->size())
         return;
 
@@ -176,7 +186,7 @@ void RemoteQueryExecutor::sendQuery()
     was_cancelled = false;
 
     auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(settings);
-    ClientInfo modified_client_info = context.getClientInfo();
+    ClientInfo modified_client_info = context->getClientInfo();
     modified_client_info.query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
     if (CurrentThread::isInitialized())
     {
@@ -205,7 +215,7 @@ Block RemoteQueryExecutor::read()
     {
         sendQuery();
 
-        if (context.getSettingsRef().skip_unavailable_shards && (0 == connections->size()))
+        if (context->getSettingsRef().skip_unavailable_shards && (0 == connections->size()))
             return {};
     }
 
@@ -231,7 +241,7 @@ std::variant<Block, int> RemoteQueryExecutor::read(std::unique_ptr<ReadContext>
     {
         sendQuery();
 
-        if (context.getSettingsRef().skip_unavailable_shards && (0 == connections->size()))
+        if (context->getSettingsRef().skip_unavailable_shards && (0 == connections->size()))
             return Block();
     }
 
@@ -363,8 +373,8 @@ std::optional<Block> RemoteQueryExecutor::processPacket(Packet packet)
 
 bool RemoteQueryExecutor::setPartUUIDs(const std::vector<UUID> & uuids)
 {
-    Context & query_context = const_cast<Context &>(context).getQueryContext();
-    auto duplicates = query_context.getPartUUIDs()->add(uuids);
+    auto query_context = context->getQueryContext();
+    auto duplicates = query_context->getPartUUIDs()->add(uuids);
 
     if (!duplicates.empty())
     {
diff --git a/src/DataStreams/RemoteQueryExecutor.h b/src/DataStreams/RemoteQueryExecutor.h
index f55a023231b..45a633230b7 100644
--- a/src/DataStreams/RemoteQueryExecutor.h
+++ b/src/DataStreams/RemoteQueryExecutor.h
@@ -35,21 +35,21 @@ public:
     /// Takes already set connection.
     RemoteQueryExecutor(
         Connection & connection,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         ThrottlerPtr throttler_ = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
         QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
     /// Accepts several connections already taken from pool.
     RemoteQueryExecutor(
         std::vector<IConnectionPool::Entry> && connections_,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         const ThrottlerPtr & throttler = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
         QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
     /// Takes a pool and gets one or several connections from it.
     RemoteQueryExecutor(
         const ConnectionPoolWithFailoverPtr & pool,
-        const String & query_, const Block & header_, const Context & context_,
+        const String & query_, const Block & header_, ContextPtr context_,
         const ThrottlerPtr & throttler = nullptr, const Scalars & scalars_ = Scalars(), const Tables & external_tables_ = Tables(),
         QueryProcessingStage::Enum stage_ = QueryProcessingStage::Complete);
 
@@ -108,8 +108,8 @@ private:
     std::unique_ptr<IConnections> connections;
 
     const String query;
-    String query_id = "";
-    Context context;
+    String query_id;
+    ContextPtr context;
 
     ProgressCallback progress_callback;
     ProfileInfoCallback profile_info_callback;
diff --git a/src/DataStreams/TTLAggregationAlgorithm.cpp b/src/DataStreams/TTLAggregationAlgorithm.cpp
index ebe08159c55..9a1cf45772f 100644
--- a/src/DataStreams/TTLAggregationAlgorithm.cpp
+++ b/src/DataStreams/TTLAggregationAlgorithm.cpp
@@ -28,12 +28,12 @@ TTLAggregationAlgorithm::TTLAggregationAlgorithm(
                 descr.arguments.push_back(header.getPositionByName(name));
 
     columns_for_aggregator.resize(description.aggregate_descriptions.size());
-    const Settings & settings = storage_.global_context.getSettingsRef();
+    const Settings & settings = storage_.getContext()->getSettingsRef();
 
     Aggregator::Params params(header, keys, aggregates,
         false, settings.max_rows_to_group_by, settings.group_by_overflow_mode, 0, 0,
         settings.max_bytes_before_external_group_by, settings.empty_result_for_aggregation_by_empty_set,
-        storage_.global_context.getTemporaryVolume(), settings.max_threads, settings.min_free_disk_space_for_temporary_data);
+        storage_.getContext()->getTemporaryVolume(), settings.max_threads, settings.min_free_disk_space_for_temporary_data);
 
     aggregator = std::make_unique<Aggregator>(params);
 }
diff --git a/src/DataStreams/TTLBlockInputStream.cpp b/src/DataStreams/TTLBlockInputStream.cpp
index 4f141a03475..8b31da6d2f1 100644
--- a/src/DataStreams/TTLBlockInputStream.cpp
+++ b/src/DataStreams/TTLBlockInputStream.cpp
@@ -68,8 +68,9 @@ TTLBlockInputStream::TTLBlockInputStream(
                 auto default_ast = it->second.expression->clone();
                 default_ast = addTypeConversionToAST(std::move(default_ast), column.type->getName());
 
-                auto syntax_result = TreeRewriter(storage_.global_context).analyze(default_ast, metadata_snapshot_->getColumns().getAllPhysical());
-                default_expression = ExpressionAnalyzer{default_ast, syntax_result, storage_.global_context}.getActions(true);
+                auto syntax_result
+                    = TreeRewriter(storage_.getContext()).analyze(default_ast, metadata_snapshot_->getColumns().getAllPhysical());
+                default_expression = ExpressionAnalyzer{default_ast, syntax_result, storage_.getContext()}.getActions(true);
                 default_column_name = default_ast->getColumnName();
             }
 
diff --git a/src/DataTypes/DataTypeDecimalBase.cpp b/src/DataTypes/DataTypeDecimalBase.cpp
index 5f64fca6704..683710b8880 100644
--- a/src/DataTypes/DataTypeDecimalBase.cpp
+++ b/src/DataTypes/DataTypeDecimalBase.cpp
@@ -19,9 +19,14 @@ namespace ErrorCodes
 {
 }
 
-
-bool decimalCheckComparisonOverflow(const Context & context) { return context.getSettingsRef().decimal_check_overflow; }
-bool decimalCheckArithmeticOverflow(const Context & context) { return context.getSettingsRef().decimal_check_overflow; }
+bool decimalCheckComparisonOverflow(ContextPtr context)
+{
+    return context->getSettingsRef().decimal_check_overflow;
+}
+bool decimalCheckArithmeticOverflow(ContextPtr context)
+{
+    return context->getSettingsRef().decimal_check_overflow;
+}
 
 template <typename T>
 Field DataTypeDecimalBase<T>::getDefault() const
diff --git a/src/DataTypes/DataTypeDecimalBase.h b/src/DataTypes/DataTypeDecimalBase.h
index 85cb9fa8363..9e44310a0ff 100644
--- a/src/DataTypes/DataTypeDecimalBase.h
+++ b/src/DataTypes/DataTypeDecimalBase.h
@@ -1,11 +1,12 @@
 #pragma once
-#include <cmath>
 
 #include <Columns/ColumnDecimal.h>
 #include <Core/DecimalFunctions.h>
 #include <DataTypes/IDataType.h>
 #include <DataTypes/DataTypesNumber.h>
+#include <Interpreters/Context_fwd.h>
 
+#include <cmath>
 #include <type_traits>
 
 
@@ -17,9 +18,8 @@ namespace ErrorCodes
     extern const int ARGUMENT_OUT_OF_BOUND;
 }
 
-class Context;
-bool decimalCheckComparisonOverflow(const Context & context);
-bool decimalCheckArithmeticOverflow(const Context & context);
+bool decimalCheckComparisonOverflow(ContextPtr context);
+bool decimalCheckArithmeticOverflow(ContextPtr context);
 
 inline UInt32 leastDecimalPrecisionFor(TypeIndex int_type)
 {
diff --git a/src/DataTypes/DataTypeFactory.cpp b/src/DataTypes/DataTypeFactory.cpp
index eee3f22f9f1..c28de15565c 100644
--- a/src/DataTypes/DataTypeFactory.cpp
+++ b/src/DataTypes/DataTypeFactory.cpp
@@ -156,7 +156,7 @@ void DataTypeFactory::registerSimpleDataTypeCustom(const String &name, SimpleCre
 
 const DataTypeFactory::Value & DataTypeFactory::findCreatorByName(const String & family_name) const
 {
-    const Context * query_context = nullptr;
+    ContextPtr query_context;
     if (CurrentThread::isInitialized())
         query_context = CurrentThread::get().getQueryContext();
 
diff --git a/src/Databases/DatabaseAtomic.cpp b/src/Databases/DatabaseAtomic.cpp
index b4222a7e349..c9e533dfafb 100644
--- a/src/Databases/DatabaseAtomic.cpp
+++ b/src/Databases/DatabaseAtomic.cpp
@@ -35,10 +35,10 @@ public:
     UUID uuid() const override { return table()->getStorageID().uuid; }
 };
 
-DatabaseAtomic::DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const String & logger_name, const Context & context_)
+DatabaseAtomic::DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const String & logger_name, ContextPtr context_)
     : DatabaseOrdinary(name_, std::move(metadata_path_), "store/", logger_name, context_)
-    , path_to_table_symlinks(global_context.getPath() + "data/" + escapeForFileName(name_) + "/")
-    , path_to_metadata_symlink(global_context.getPath() + "metadata/" + escapeForFileName(name_))
+    , path_to_table_symlinks(getContext()->getPath() + "data/" + escapeForFileName(name_) + "/")
+    , path_to_metadata_symlink(getContext()->getPath() + "metadata/" + escapeForFileName(name_))
     , db_uuid(uuid)
 {
     assert(db_uuid != UUIDHelpers::Nil);
@@ -46,7 +46,7 @@ DatabaseAtomic::DatabaseAtomic(String name_, String metadata_path_, UUID uuid, c
     tryCreateMetadataSymlink();
 }
 
-DatabaseAtomic::DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const Context & context_)
+DatabaseAtomic::DatabaseAtomic(String name_, String metadata_path_, UUID uuid, ContextPtr context_)
     : DatabaseAtomic(name_, std::move(metadata_path_), uuid, "DatabaseAtomic (" + name_ + ")", context_)
 {
 }
@@ -68,7 +68,7 @@ String DatabaseAtomic::getTableDataPath(const ASTCreateQuery & query) const
     return tmp;
 }
 
-void DatabaseAtomic::drop(const Context &)
+void DatabaseAtomic::drop(ContextPtr)
 {
     assert(tables.empty());
     try
@@ -106,13 +106,13 @@ StoragePtr DatabaseAtomic::detachTable(const String & name)
     return table;
 }
 
-void DatabaseAtomic::dropTable(const Context & context, const String & table_name, bool no_delay)
+void DatabaseAtomic::dropTable(ContextPtr local_context, const String & table_name, bool no_delay)
 {
-    if (auto * mv = dynamic_cast<StorageMaterializedView *>(tryGetTable(table_name, context).get()))
+    if (auto * mv = dynamic_cast<StorageMaterializedView *>(tryGetTable(table_name, local_context).get()))
     {
         /// Remove the inner table (if any) to avoid deadlock
         /// (due to attempt to execute DROP from the worker thread)
-        mv->dropInnerTable(no_delay, context);
+        mv->dropInnerTable(no_delay, local_context);
     }
 
     String table_metadata_path = getObjectMetadataPath(table_name);
@@ -122,8 +122,8 @@ void DatabaseAtomic::dropTable(const Context & context, const String & table_nam
         std::unique_lock lock(mutex);
         table = getTableUnlocked(table_name, lock);
         table_metadata_path_drop = DatabaseCatalog::instance().getPathForDroppedMetadata(table->getStorageID());
-        auto txn = context.getZooKeeperMetadataTransaction();
-        if (txn && !context.isInternalSubquery())
+        auto txn = local_context->getZooKeeperMetadataTransaction();
+        if (txn && !local_context->isInternalSubquery())
             txn->commit();      /// Commit point (a sort of) for Replicated database
 
         /// NOTE: replica will be lost if server crashes before the following rename
@@ -144,7 +144,7 @@ void DatabaseAtomic::dropTable(const Context & context, const String & table_nam
     DatabaseCatalog::instance().enqueueDroppedTableCleanup(table->getStorageID(), table, table_metadata_path_drop, no_delay);
 }
 
-void DatabaseAtomic::renameTable(const Context & context, const String & table_name, IDatabase & to_database,
+void DatabaseAtomic::renameTable(ContextPtr local_context, const String & table_name, IDatabase & to_database,
                                  const String & to_table_name, bool exchange, bool dictionary)
 {
     if (typeid(*this) != typeid(to_database))
@@ -152,7 +152,7 @@ void DatabaseAtomic::renameTable(const Context & context, const String & table_n
         if (!typeid_cast<DatabaseOrdinary *>(&to_database))
             throw Exception("Moving tables between databases of different engines is not supported", ErrorCodes::NOT_IMPLEMENTED);
         /// Allow moving tables between Atomic and Ordinary (with table lock)
-        DatabaseOnDisk::renameTable(context, table_name, to_database, to_table_name, exchange, dictionary);
+        DatabaseOnDisk::renameTable(local_context, table_name, to_database, to_table_name, exchange, dictionary);
         return;
     }
 
@@ -248,8 +248,8 @@ void DatabaseAtomic::renameTable(const Context & context, const String & table_n
     }
 
     /// Table renaming actually begins here
-    auto txn = context.getZooKeeperMetadataTransaction();
-    if (txn && !context.isInternalSubquery())
+    auto txn = local_context->getZooKeeperMetadataTransaction();
+    if (txn && !local_context->isInternalSubquery())
         txn->commit();     /// Commit point (a sort of) for Replicated database
 
     /// NOTE: replica will be lost if server crashes before the following rename
@@ -291,7 +291,7 @@ void DatabaseAtomic::renameTable(const Context & context, const String & table_n
 
 void DatabaseAtomic::commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
                                        const String & table_metadata_tmp_path, const String & table_metadata_path,
-                                       const Context & query_context)
+                                       ContextPtr query_context)
 {
     DetachedTables not_in_use;
     auto table_data_path = getTableDataPath(query);
@@ -309,8 +309,8 @@ void DatabaseAtomic::commitCreateTable(const ASTCreateQuery & query, const Stora
         DatabaseCatalog::instance().addUUIDMapping(query.uuid);
         locked_uuid = true;
 
-        auto txn = query_context.getZooKeeperMetadataTransaction();
-        if (txn && !query_context.isInternalSubquery())
+        auto txn = query_context->getZooKeeperMetadataTransaction();
+        if (txn && !query_context->isInternalSubquery())
             txn->commit();     /// Commit point (a sort of) for Replicated database
 
         /// NOTE: replica will be lost if server crashes before the following renameNoReplace(...)
@@ -333,7 +333,7 @@ void DatabaseAtomic::commitCreateTable(const ASTCreateQuery & query, const Stora
 }
 
 void DatabaseAtomic::commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path,
-                                      const String & /*statement*/, const Context & query_context)
+                                      const String & /*statement*/, ContextPtr query_context)
 {
     bool check_file_exists = true;
     SCOPE_EXIT({ std::error_code code; if (check_file_exists) std::filesystem::remove(table_metadata_tmp_path, code); });
@@ -344,8 +344,8 @@ void DatabaseAtomic::commitAlterTable(const StorageID & table_id, const String &
     if (table_id.uuid != actual_table_id.uuid)
         throw Exception("Cannot alter table because it was renamed", ErrorCodes::CANNOT_ASSIGN_ALTER);
 
-    auto txn = query_context.getZooKeeperMetadataTransaction();
-    if (txn && !query_context.isInternalSubquery())
+    auto txn = query_context->getZooKeeperMetadataTransaction();
+    if (txn && !query_context->isInternalSubquery())
         txn->commit();      /// Commit point (a sort of) for Replicated database
 
     /// NOTE: replica will be lost if server crashes before the following rename
@@ -409,26 +409,27 @@ void DatabaseAtomic::assertCanBeDetached(bool cleanup)
                         "because some tables are still in use. Retry later.", ErrorCodes::DATABASE_NOT_EMPTY);
 }
 
-DatabaseTablesIteratorPtr DatabaseAtomic::getTablesIterator(const Context & context, const IDatabase::FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr
+DatabaseAtomic::getTablesIterator(ContextPtr local_context, const IDatabase::FilterByNameFunction & filter_by_table_name)
 {
-    auto base_iter = DatabaseWithOwnTablesBase::getTablesIterator(context, filter_by_table_name);
+    auto base_iter = DatabaseWithOwnTablesBase::getTablesIterator(local_context, filter_by_table_name);
     return std::make_unique<AtomicDatabaseTablesSnapshotIterator>(std::move(typeid_cast<DatabaseTablesSnapshotIterator &>(*base_iter)));
 }
 
 UUID DatabaseAtomic::tryGetTableUUID(const String & table_name) const
 {
-    if (auto table = tryGetTable(table_name, global_context))
+    if (auto table = tryGetTable(table_name, getContext()))
         return table->getStorageID().uuid;
     return UUIDHelpers::Nil;
 }
 
-void DatabaseAtomic::loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseAtomic::loadStoredObjects(ContextPtr local_context, bool has_force_restore_data_flag, bool force_attach)
 {
     /// Recreate symlinks to table data dirs in case of force restore, because some of them may be broken
     if (has_force_restore_data_flag)
         Poco::File(path_to_table_symlinks).remove(true);
 
-    DatabaseOrdinary::loadStoredObjects(context, has_force_restore_data_flag, force_attach);
+    DatabaseOrdinary::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach);
 
     if (has_force_restore_data_flag)
     {
@@ -449,7 +450,7 @@ void DatabaseAtomic::tryCreateSymlink(const String & table_name, const String &
     try
     {
         String link = path_to_table_symlinks + escapeForFileName(table_name);
-        Poco::File data = Poco::Path(global_context.getPath()).makeAbsolute().toString() + actual_data_path;
+        Poco::File data = Poco::Path(getContext()->getPath()).makeAbsolute().toString() + actual_data_path;
         if (!if_data_path_exist || data.exists())
             data.linkTo(link, Poco::File::LINK_SYMBOLIC);
     }
@@ -509,8 +510,8 @@ void DatabaseAtomic::renameDatabase(const String & new_name)
     }
 
     auto new_name_escaped = escapeForFileName(new_name);
-    auto old_database_metadata_path = global_context.getPath() + "metadata/" + escapeForFileName(getDatabaseName()) + ".sql";
-    auto new_database_metadata_path = global_context.getPath() + "metadata/" + new_name_escaped + ".sql";
+    auto old_database_metadata_path = getContext()->getPath() + "metadata/" + escapeForFileName(getDatabaseName()) + ".sql";
+    auto new_database_metadata_path = getContext()->getPath() + "metadata/" + new_name_escaped + ".sql";
     renameNoReplace(old_database_metadata_path, new_database_metadata_path);
 
     String old_path_to_table_symlinks;
@@ -535,9 +536,9 @@ void DatabaseAtomic::renameDatabase(const String & new_name)
             renameDictionaryInMemoryUnlocked(old_name, name);
         }
 
-        path_to_metadata_symlink = global_context.getPath() + "metadata/" + new_name_escaped;
+        path_to_metadata_symlink = getContext()->getPath() + "metadata/" + new_name_escaped;
         old_path_to_table_symlinks = path_to_table_symlinks;
-        path_to_table_symlinks = global_context.getPath() + "data/" + new_name_escaped + "/";
+        path_to_table_symlinks = getContext()->getPath() + "data/" + new_name_escaped + "/";
     }
 
     Poco::File(old_path_to_table_symlinks).renameTo(path_to_table_symlinks);
diff --git a/src/Databases/DatabaseAtomic.h b/src/Databases/DatabaseAtomic.h
index 09cdf269b35..d35495fc962 100644
--- a/src/Databases/DatabaseAtomic.h
+++ b/src/Databases/DatabaseAtomic.h
@@ -19,8 +19,8 @@ namespace DB
 class DatabaseAtomic : public DatabaseOrdinary
 {
 public:
-    DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const String & logger_name, const Context & context_);
-    DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const Context & context_);
+    DatabaseAtomic(String name_, String metadata_path_, UUID uuid, const String & logger_name, ContextPtr context_);
+    DatabaseAtomic(String name_, String metadata_path_, UUID uuid, ContextPtr context_);
 
     String getEngineName() const override { return "Atomic"; }
     UUID getUUID() const override { return db_uuid; }
@@ -28,14 +28,14 @@ public:
     void renameDatabase(const String & new_name) override;
 
     void renameTable(
-            const Context & context,
+            ContextPtr context,
             const String & table_name,
             IDatabase & to_database,
             const String & to_table_name,
             bool exchange,
             bool dictionary) override;
 
-    void dropTable(const Context & context, const String & table_name, bool no_delay) override;
+    void dropTable(ContextPtr context, const String & table_name, bool no_delay) override;
 
     void attachTable(const String & name, const StoragePtr & table, const String & relative_table_path) override;
     StoragePtr detachTable(const String & name) override;
@@ -43,11 +43,11 @@ public:
     String getTableDataPath(const String & table_name) const override;
     String getTableDataPath(const ASTCreateQuery & query) const override;
 
-    void drop(const Context & /*context*/) override;
+    void drop(ContextPtr /*context*/) override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
-    void loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextPtr context, bool has_force_restore_data_flag, bool force_attach) override;
 
     /// Atomic database cannot be detached if there is detached table which still in use
     void assertCanBeDetached(bool cleanup) override;
@@ -61,12 +61,12 @@ public:
     void setDetachedTableNotInUseForce(const UUID & uuid);
 
 protected:
-    void commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & statement, const Context & query_context) override;
+    void commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & statement, ContextPtr query_context) override;
     void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
-                           const String & table_metadata_tmp_path, const String & table_metadata_path, const Context & query_context) override;
+                           const String & table_metadata_tmp_path, const String & table_metadata_path, ContextPtr query_context) override;
 
     void assertDetachedTableNotInUse(const UUID & uuid);
-    typedef std::unordered_map<UUID, StoragePtr> DetachedTables;
+    using DetachedTables = std::unordered_map<UUID, StoragePtr>;
     [[nodiscard]] DetachedTables cleanupDetachedTables();
 
     void tryCreateMetadataSymlink();
@@ -74,7 +74,7 @@ protected:
     void renameDictionaryInMemoryUnlocked(const StorageID & old_name, const StorageID & new_name);
 
     //TODO store path in DatabaseWithOwnTables::tables
-    typedef std::unordered_map<String, String> NameToPathMap;
+    using NameToPathMap = std::unordered_map<String, String>;
     NameToPathMap table_name_to_path;
 
     DetachedTables detached_tables;
diff --git a/src/Databases/DatabaseDictionary.cpp b/src/Databases/DatabaseDictionary.cpp
index ff5510f0bf9..c00201145eb 100644
--- a/src/Databases/DatabaseDictionary.cpp
+++ b/src/Databases/DatabaseDictionary.cpp
@@ -44,17 +44,16 @@ namespace
     }
 }
 
-DatabaseDictionary::DatabaseDictionary(const String & name_, const Context & context_)
-    : IDatabase(name_)
+DatabaseDictionary::DatabaseDictionary(const String & name_, ContextPtr context_)
+    : IDatabase(name_), WithContext(context_->getGlobalContext())
     , log(&Poco::Logger::get("DatabaseDictionary(" + database_name + ")"))
-    , global_context(context_.getGlobalContext())
 {
 }
 
 Tables DatabaseDictionary::listTables(const FilterByNameFunction & filter_by_name)
 {
     Tables tables;
-    auto load_results = global_context.getExternalDictionariesLoader().getLoadResults(filter_by_name);
+    auto load_results = getContext()->getExternalDictionariesLoader().getLoadResults(filter_by_name);
     String db_name = getDatabaseName();
     for (auto & load_result : load_results)
     {
@@ -65,34 +64,34 @@ Tables DatabaseDictionary::listTables(const FilterByNameFunction & filter_by_nam
     return tables;
 }
 
-bool DatabaseDictionary::isTableExist(const String & table_name, const Context &) const
+bool DatabaseDictionary::isTableExist(const String & table_name, ContextPtr) const
 {
-    return global_context.getExternalDictionariesLoader().getCurrentStatus(table_name) != ExternalLoader::Status::NOT_EXIST;
+    return getContext()->getExternalDictionariesLoader().getCurrentStatus(table_name) != ExternalLoader::Status::NOT_EXIST;
 }
 
-StoragePtr DatabaseDictionary::tryGetTable(const String & table_name, const Context &) const
+StoragePtr DatabaseDictionary::tryGetTable(const String & table_name, ContextPtr) const
 {
-    auto load_result = global_context.getExternalDictionariesLoader().getLoadResult(table_name);
+    auto load_result = getContext()->getExternalDictionariesLoader().getLoadResult(table_name);
     return createStorageDictionary(getDatabaseName(), load_result);
 }
 
-DatabaseTablesIteratorPtr DatabaseDictionary::getTablesIterator(const Context &, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseDictionary::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
 {
     return std::make_unique<DatabaseTablesSnapshotIterator>(listTables(filter_by_table_name), getDatabaseName());
 }
 
 bool DatabaseDictionary::empty() const
 {
-    return !global_context.getExternalDictionariesLoader().hasObjects();
+    return !getContext()->getExternalDictionariesLoader().hasObjects();
 }
 
-ASTPtr DatabaseDictionary::getCreateTableQueryImpl(const String & table_name, const Context &, bool throw_on_error) const
+ASTPtr DatabaseDictionary::getCreateTableQueryImpl(const String & table_name, ContextPtr, bool throw_on_error) const
 {
     String query;
     {
         WriteBufferFromString buffer(query);
 
-        auto load_result = global_context.getExternalDictionariesLoader().getLoadResult(table_name);
+        auto load_result = getContext()->getExternalDictionariesLoader().getLoadResult(table_name);
         if (!load_result.config)
         {
             if (throw_on_error)
@@ -106,7 +105,7 @@ ASTPtr DatabaseDictionary::getCreateTableQueryImpl(const String & table_name, co
         buffer << ") Engine = Dictionary(" << backQuoteIfNeed(table_name) << ")";
     }
 
-    auto settings = global_context.getSettingsRef();
+    auto settings = getContext()->getSettingsRef();
     ParserCreateQuery parser;
     const char * pos = query.data();
     std::string error_message;
@@ -126,7 +125,7 @@ ASTPtr DatabaseDictionary::getCreateDatabaseQuery() const
         WriteBufferFromString buffer(query);
         buffer << "CREATE DATABASE " << backQuoteIfNeed(getDatabaseName()) << " ENGINE = Dictionary";
     }
-    auto settings = global_context.getSettingsRef();
+    auto settings = getContext()->getSettingsRef();
     ParserCreateQuery parser;
     return parseQuery(parser, query.data(), query.data() + query.size(), "", 0, settings.max_parser_depth);
 }
diff --git a/src/Databases/DatabaseDictionary.h b/src/Databases/DatabaseDictionary.h
index 2cfc6ef3285..06402a96381 100644
--- a/src/Databases/DatabaseDictionary.h
+++ b/src/Databases/DatabaseDictionary.h
@@ -1,11 +1,12 @@
 #pragma once
 
-#include <mutex>
-#include <unordered_set>
 #include <Databases/DatabasesCommon.h>
 #include <Databases/IDatabase.h>
 #include <Storages/IStorage_fwd.h>
 
+#include <mutex>
+#include <unordered_set>
+
 
 namespace Poco
 {
@@ -19,21 +20,21 @@ namespace DB
 /* Database to store StorageDictionary tables
  * automatically creates tables for all dictionaries
  */
-class DatabaseDictionary final : public IDatabase
+class DatabaseDictionary final : public IDatabase, WithContext
 {
 public:
-    DatabaseDictionary(const String & name_, const Context & context_);
+    DatabaseDictionary(const String & name_, ContextPtr context_);
 
     String getEngineName() const override
     {
         return "Dictionary";
     }
 
-    bool isTableExist(const String & table_name, const Context & context) const override;
+    bool isTableExist(const String & table_name, ContextPtr context) const override;
 
-    StoragePtr tryGetTable(const String & table_name, const Context & context) const override;
+    StoragePtr tryGetTable(const String & table_name, ContextPtr context) const override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
     bool empty() const override;
 
@@ -44,11 +45,10 @@ public:
     void shutdown() override;
 
 protected:
-    ASTPtr getCreateTableQueryImpl(const String & table_name, const Context & context, bool throw_on_error) const override;
+    ASTPtr getCreateTableQueryImpl(const String & table_name, ContextPtr context, bool throw_on_error) const override;
 
 private:
     Poco::Logger * log;
-    const Context & global_context;
 
     Tables listTables(const FilterByNameFunction & filter_by_name);
 };
diff --git a/src/Databases/DatabaseFactory.cpp b/src/Databases/DatabaseFactory.cpp
index 40d4f805dd4..03c2849ac94 100644
--- a/src/Databases/DatabaseFactory.cpp
+++ b/src/Databases/DatabaseFactory.cpp
@@ -51,7 +51,7 @@ namespace ErrorCodes
     extern const int CANNOT_CREATE_DATABASE;
 }
 
-DatabasePtr DatabaseFactory::get(const ASTCreateQuery & create, const String & metadata_path, Context & context)
+DatabasePtr DatabaseFactory::get(const ASTCreateQuery & create, const String & metadata_path, ContextPtr context)
 {
     bool created = false;
 
@@ -66,8 +66,8 @@ DatabasePtr DatabaseFactory::get(const ASTCreateQuery & create, const String & m
 
         DatabasePtr impl = getImpl(create, metadata_path, context);
 
-        if (impl && context.hasQueryContext() && context.getSettingsRef().log_queries)
-            context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Database, impl->getEngineName());
+        if (impl && context->hasQueryContext() && context->getSettingsRef().log_queries)
+            context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Database, impl->getEngineName());
 
         return impl;
 
@@ -92,7 +92,7 @@ static inline ValueType safeGetLiteralValue(const ASTPtr &ast, const String &eng
     return ast->as<ASTLiteral>()->value.safeGet<ValueType>();
 }
 
-DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String & metadata_path, Context & context)
+DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String & metadata_path, ContextPtr context)
 {
     auto * engine_define = create.storage;
     const String & database_name = create.database;
@@ -145,7 +145,7 @@ DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String
             {
                 auto mysql_database_settings = std::make_unique<ConnectionMySQLSettings>();
                 /// Split into replicas if needed.
-                size_t max_addresses = context.getSettingsRef().glob_expansion_max_elements;
+                size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
                 auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 3306);
                 auto mysql_pool = mysqlxx::PoolWithFailover(mysql_database_name, addresses, mysql_user_name, mysql_user_password);
 
@@ -209,9 +209,9 @@ DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String
         String shard_name = safeGetLiteralValue<String>(arguments[1], "Replicated");
         String replica_name  = safeGetLiteralValue<String>(arguments[2], "Replicated");
 
-        zookeeper_path = context.getMacros()->expand(zookeeper_path);
-        shard_name = context.getMacros()->expand(shard_name);
-        replica_name = context.getMacros()->expand(replica_name);
+        zookeeper_path = context->getMacros()->expand(zookeeper_path);
+        shard_name = context->getMacros()->expand(shard_name);
+        replica_name = context->getMacros()->expand(replica_name);
 
         DatabaseReplicatedSettings database_replicated_settings{};
         if (engine_define->settings)
@@ -249,7 +249,7 @@ DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String
             use_table_cache = safeGetLiteralValue<UInt64>(engine_args[4], engine_name);
 
         /// Split into replicas if needed.
-        size_t max_addresses = context.getSettingsRef().glob_expansion_max_elements;
+        size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
         auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 5432);
 
         /// no connection is made here
@@ -257,8 +257,8 @@ DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String
             postgres_database_name,
             addresses,
             username, password,
-            context.getSettingsRef().postgresql_connection_pool_size,
-            context.getSettingsRef().postgresql_connection_pool_wait_timeout);
+            context->getSettingsRef().postgresql_connection_pool_size,
+            context->getSettingsRef().postgresql_connection_pool_wait_timeout);
 
         return std::make_shared<DatabasePostgreSQL>(
             context, metadata_path, engine_define, database_name, postgres_database_name, connection_pool, use_table_cache);
diff --git a/src/Databases/DatabaseFactory.h b/src/Databases/DatabaseFactory.h
index 88d33dc1cd5..8992ea27093 100644
--- a/src/Databases/DatabaseFactory.h
+++ b/src/Databases/DatabaseFactory.h
@@ -11,9 +11,9 @@ class ASTCreateQuery;
 class DatabaseFactory
 {
 public:
-    static DatabasePtr get(const ASTCreateQuery & create, const String & metadata_path, Context & context);
+    static DatabasePtr get(const ASTCreateQuery & create, const String & metadata_path, ContextPtr context);
 
-    static DatabasePtr getImpl(const ASTCreateQuery & create, const String & metadata_path, Context & context);
+    static DatabasePtr getImpl(const ASTCreateQuery & create, const String & metadata_path, ContextPtr context);
 };
 
 }
diff --git a/src/Databases/DatabaseLazy.cpp b/src/Databases/DatabaseLazy.cpp
index b1bc55bf58d..d498cb96062 100644
--- a/src/Databases/DatabaseLazy.cpp
+++ b/src/Databases/DatabaseLazy.cpp
@@ -27,7 +27,7 @@ namespace ErrorCodes
 }
 
 
-DatabaseLazy::DatabaseLazy(const String & name_, const String & metadata_path_, time_t expiration_time_, const Context & context_)
+DatabaseLazy::DatabaseLazy(const String & name_, const String & metadata_path_, time_t expiration_time_, ContextPtr context_)
     : DatabaseOnDisk(name_, metadata_path_, "data/" + escapeForFileName(name_) + "/", "DatabaseLazy (" + name_ + ")", context_)
     , expiration_time(expiration_time_)
 {
@@ -35,11 +35,11 @@ DatabaseLazy::DatabaseLazy(const String & name_, const String & metadata_path_,
 
 
 void DatabaseLazy::loadStoredObjects(
-    Context & context,
+    ContextPtr local_context,
     bool /* has_force_restore_data_flag */,
     bool /*force_attach*/)
 {
-    iterateMetadataFiles(context, [this](const String & file_name)
+    iterateMetadataFiles(local_context, [this](const String & file_name)
     {
         const std::string table_name = file_name.substr(0, file_name.size() - 4);
 
@@ -56,7 +56,7 @@ void DatabaseLazy::loadStoredObjects(
 
 
 void DatabaseLazy::createTable(
-    const Context & context,
+    ContextPtr local_context,
     const String & table_name,
     const StoragePtr & table,
     const ASTPtr & query)
@@ -64,7 +64,7 @@ void DatabaseLazy::createTable(
     SCOPE_EXIT_MEMORY_SAFE({ clearExpiredTables(); });
     if (!endsWith(table->getName(), "Log"))
         throw Exception("Lazy engine can be used only with *Log tables.", ErrorCodes::UNSUPPORTED_METHOD);
-    DatabaseOnDisk::createTable(context, table_name, table, query);
+    DatabaseOnDisk::createTable(local_context, table_name, table, query);
 
     /// DatabaseOnDisk::createTable renames file, so we need to get new metadata_modification_time.
     std::lock_guard lock(mutex);
@@ -74,16 +74,16 @@ void DatabaseLazy::createTable(
 }
 
 void DatabaseLazy::dropTable(
-    const Context & context,
+    ContextPtr local_context,
     const String & table_name,
     bool no_delay)
 {
     SCOPE_EXIT_MEMORY_SAFE({ clearExpiredTables(); });
-    DatabaseOnDisk::dropTable(context, table_name, no_delay);
+    DatabaseOnDisk::dropTable(local_context, table_name, no_delay);
 }
 
 void DatabaseLazy::renameTable(
-    const Context & context,
+    ContextPtr local_context,
     const String & table_name,
     IDatabase & to_database,
     const String & to_table_name,
@@ -91,7 +91,7 @@ void DatabaseLazy::renameTable(
     bool dictionary)
 {
     SCOPE_EXIT_MEMORY_SAFE({ clearExpiredTables(); });
-    DatabaseOnDisk::renameTable(context, table_name, to_database, to_table_name, exchange, dictionary);
+    DatabaseOnDisk::renameTable(local_context, table_name, to_database, to_table_name, exchange, dictionary);
 }
 
 
@@ -105,7 +105,7 @@ time_t DatabaseLazy::getObjectMetadataModificationTime(const String & table_name
 }
 
 void DatabaseLazy::alterTable(
-    const Context & /* context */,
+    ContextPtr /* context */,
     const StorageID & /*table_id*/,
     const StorageInMemoryMetadata & /* metadata */)
 {
@@ -142,7 +142,7 @@ StoragePtr DatabaseLazy::tryGetTable(const String & table_name) const
     return loadTable(table_name);
 }
 
-DatabaseTablesIteratorPtr DatabaseLazy::getTablesIterator(const Context &, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseLazy::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
 {
     std::lock_guard lock(mutex);
     Strings filtered_tables;
@@ -233,9 +233,9 @@ StoragePtr DatabaseLazy::loadTable(const String & table_name) const
     try
     {
         StoragePtr table;
-        Context context_copy(global_context); /// some tables can change context, but not LogTables
+        auto context_copy = Context::createCopy(context); /// some tables can change context, but not LogTables
 
-        auto ast = parseQueryFromMetadata(log, global_context, table_metadata_path, /*throw_on_error*/ true, /*remove_empty*/false);
+        auto ast = parseQueryFromMetadata(log, getContext(), table_metadata_path, /*throw_on_error*/ true, /*remove_empty*/false);
         if (ast)
         {
             const auto & ast_create = ast->as<const ASTCreateQuery &>();
diff --git a/src/Databases/DatabaseLazy.h b/src/Databases/DatabaseLazy.h
index 2d091297c91..99a71b342fa 100644
--- a/src/Databases/DatabaseLazy.h
+++ b/src/Databases/DatabaseLazy.h
@@ -18,7 +18,7 @@ class Context;
 class DatabaseLazy final : public DatabaseOnDisk
 {
 public:
-    DatabaseLazy(const String & name_, const String & metadata_path_, time_t expiration_time_, const Context & context_);
+    DatabaseLazy(const String & name_, const String & metadata_path_, time_t expiration_time_, ContextPtr context_);
 
     String getEngineName() const override { return "Lazy"; }
 
@@ -27,22 +27,22 @@ public:
     bool canContainDistributedTables() const override { return false; }
 
     void loadStoredObjects(
-        Context & context,
+        ContextPtr context,
         bool has_force_restore_data_flag, bool force_attach) override;
 
     void createTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         const StoragePtr & table,
         const ASTPtr & query) override;
 
     void dropTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         bool no_delay) override;
 
     void renameTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         IDatabase & to_database,
         const String & to_table_name,
@@ -50,21 +50,21 @@ public:
         bool dictionary) override;
 
     void alterTable(
-        const Context & context,
+        ContextPtr context,
         const StorageID & table_id,
         const StorageInMemoryMetadata & metadata) override;
 
     time_t getObjectMetadataModificationTime(const String & table_name) const override;
 
-    bool isTableExist(const String & table_name, const Context &) const override { return isTableExist(table_name); }
+    bool isTableExist(const String & table_name, ContextPtr) const override { return isTableExist(table_name); }
     bool isTableExist(const String & table_name) const;
 
-    StoragePtr tryGetTable(const String & table_name, const Context &) const override { return tryGetTable(table_name); }
+    StoragePtr tryGetTable(const String & table_name, ContextPtr) const override { return tryGetTable(table_name); }
     StoragePtr tryGetTable(const String & table_name) const;
 
     bool empty() const override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
     void attachTable(const String & table_name, const StoragePtr & table, const String & relative_table_path) override;
 
diff --git a/src/Databases/DatabaseMemory.cpp b/src/Databases/DatabaseMemory.cpp
index 357acb32371..f21a145df55 100644
--- a/src/Databases/DatabaseMemory.cpp
+++ b/src/Databases/DatabaseMemory.cpp
@@ -16,13 +16,13 @@ namespace ErrorCodes
     extern const int UNKNOWN_TABLE;
 }
 
-DatabaseMemory::DatabaseMemory(const String & name_, const Context & context)
-    : DatabaseWithOwnTablesBase(name_, "DatabaseMemory(" + name_ + ")", context)
+DatabaseMemory::DatabaseMemory(const String & name_, ContextPtr context_)
+    : DatabaseWithOwnTablesBase(name_, "DatabaseMemory(" + name_ + ")", context_)
     , data_path("data/" + escapeForFileName(database_name) + "/")
 {}
 
 void DatabaseMemory::createTable(
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     const String & table_name,
     const StoragePtr & table,
     const ASTPtr & query)
@@ -33,7 +33,7 @@ void DatabaseMemory::createTable(
 }
 
 void DatabaseMemory::dropTable(
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     const String & table_name,
     bool /*no_delay*/)
 {
@@ -67,7 +67,7 @@ ASTPtr DatabaseMemory::getCreateDatabaseQuery() const
     return create_query;
 }
 
-ASTPtr DatabaseMemory::getCreateTableQueryImpl(const String & table_name, const Context &, bool throw_on_error) const
+ASTPtr DatabaseMemory::getCreateTableQueryImpl(const String & table_name, ContextPtr, bool throw_on_error) const
 {
     std::lock_guard lock{mutex};
     auto it = create_queries.find(table_name);
@@ -83,15 +83,15 @@ ASTPtr DatabaseMemory::getCreateTableQueryImpl(const String & table_name, const
 
 UUID DatabaseMemory::tryGetTableUUID(const String & table_name) const
 {
-    if (auto table = tryGetTable(table_name, global_context))
+    if (auto table = tryGetTable(table_name, getContext()))
         return table->getStorageID().uuid;
     return UUIDHelpers::Nil;
 }
 
-void DatabaseMemory::drop(const Context & context)
+void DatabaseMemory::drop(ContextPtr local_context)
 {
     /// Remove data on explicit DROP DATABASE
-    std::filesystem::remove_all(context.getPath() + data_path);
+    std::filesystem::remove_all(local_context->getPath() + data_path);
 }
 
 }
diff --git a/src/Databases/DatabaseMemory.h b/src/Databases/DatabaseMemory.h
index 40cc808e42b..8c9cf86ec19 100644
--- a/src/Databases/DatabaseMemory.h
+++ b/src/Databases/DatabaseMemory.h
@@ -19,22 +19,22 @@ namespace DB
 class DatabaseMemory final : public DatabaseWithOwnTablesBase
 {
 public:
-    DatabaseMemory(const String & name_, const Context & context);
+    DatabaseMemory(const String & name_, ContextPtr context);
 
     String getEngineName() const override { return "Memory"; }
 
     void createTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         const StoragePtr & table,
         const ASTPtr & query) override;
 
     void dropTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         bool no_delay) override;
 
-    ASTPtr getCreateTableQueryImpl(const String & name, const Context & context, bool throw_on_error) const override;
+    ASTPtr getCreateTableQueryImpl(const String & name, ContextPtr context, bool throw_on_error) const override;
     ASTPtr getCreateDatabaseQuery() const override;
 
     /// DatabaseMemory allows to create tables, which store data on disk.
@@ -46,7 +46,7 @@ public:
 
     UUID tryGetTableUUID(const String & table_name) const override;
 
-    void drop(const Context & context) override;
+    void drop(ContextPtr context) override;
 
 private:
     String data_path;
diff --git a/src/Databases/DatabaseOnDisk.cpp b/src/Databases/DatabaseOnDisk.cpp
index 79373128713..358f9030db5 100644
--- a/src/Databases/DatabaseOnDisk.cpp
+++ b/src/Databases/DatabaseOnDisk.cpp
@@ -46,7 +46,7 @@ std::pair<String, StoragePtr> createTableFromAST(
     ASTCreateQuery ast_create_query,
     const String & database_name,
     const String & table_data_path_relative,
-    Context & context,
+    ContextPtr context,
     bool has_force_restore_data_flag)
 {
     ast_create_query.attach = true;
@@ -79,7 +79,7 @@ std::pair<String, StoragePtr> createTableFromAST(
             ast_create_query,
             table_data_path_relative,
             context,
-            context.getGlobalContext(),
+            context->getGlobalContext(),
             columns,
             constraints,
             has_force_restore_data_flag)
@@ -188,23 +188,23 @@ DatabaseOnDisk::DatabaseOnDisk(
     const String & metadata_path_,
     const String & data_path_,
     const String & logger,
-    const Context & context)
-    : DatabaseWithOwnTablesBase(name, logger, context)
+    ContextPtr local_context)
+    : DatabaseWithOwnTablesBase(name, logger, local_context)
     , metadata_path(metadata_path_)
     , data_path(data_path_)
 {
-    Poco::File(context.getPath() + data_path).createDirectories();
+    Poco::File(local_context->getPath() + data_path).createDirectories();
     Poco::File(metadata_path).createDirectories();
 }
 
 
 void DatabaseOnDisk::createTable(
-    const Context & context,
+    ContextPtr local_context,
     const String & table_name,
     const StoragePtr & table,
     const ASTPtr & query)
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
     const auto & create = query->as<ASTCreateQuery &>();
     assert(table_name == create.table);
 
@@ -221,17 +221,19 @@ void DatabaseOnDisk::createTable(
     /// But there is protection from it - see using DDLGuard in InterpreterCreateQuery.
 
     if (isDictionaryExist(table_name))
-        throw Exception(ErrorCodes::DICTIONARY_ALREADY_EXISTS, "Dictionary {}.{} already exists", backQuote(getDatabaseName()), backQuote(table_name));
+        throw Exception(
+            ErrorCodes::DICTIONARY_ALREADY_EXISTS, "Dictionary {}.{} already exists", backQuote(getDatabaseName()), backQuote(table_name));
 
-    if (isTableExist(table_name, global_context))
-        throw Exception(ErrorCodes::TABLE_ALREADY_EXISTS, "Table {}.{} already exists", backQuote(getDatabaseName()), backQuote(table_name));
+    if (isTableExist(table_name, getContext()))
+        throw Exception(
+            ErrorCodes::TABLE_ALREADY_EXISTS, "Table {}.{} already exists", backQuote(getDatabaseName()), backQuote(table_name));
 
     String table_metadata_path = getObjectMetadataPath(table_name);
 
     if (create.attach_short_syntax)
     {
         /// Metadata already exists, table was detached
-        removeDetachedPermanentlyFlag(context, table_name, table_metadata_path, true);
+        removeDetachedPermanentlyFlag(local_context, table_name, table_metadata_path, true);
         attachTable(table_name, table, getTableDataPath(create));
         return;
     }
@@ -241,7 +243,7 @@ void DatabaseOnDisk::createTable(
 
     if (create.attach && Poco::File(table_metadata_path).exists())
     {
-        ASTPtr ast_detached = parseQueryFromMetadata(log, context, table_metadata_path);
+        ASTPtr ast_detached = parseQueryFromMetadata(log, local_context, table_metadata_path);
         auto & create_detached = ast_detached->as<ASTCreateQuery &>();
 
         // either both should be Nil, either values should be equal
@@ -268,14 +270,14 @@ void DatabaseOnDisk::createTable(
         out.close();
     }
 
-    commitCreateTable(create, table, table_metadata_tmp_path, table_metadata_path, context);
+    commitCreateTable(create, table, table_metadata_tmp_path, table_metadata_path, local_context);
 
-    removeDetachedPermanentlyFlag(context, table_name, table_metadata_path, false);
+    removeDetachedPermanentlyFlag(local_context, table_name, table_metadata_path, false);
 }
 
 /// If the table was detached permanently we will have a flag file with
 /// .sql.detached extension, is not needed anymore since we attached the table back
-void DatabaseOnDisk::removeDetachedPermanentlyFlag(const Context &, const String & table_name, const String & table_metadata_path, bool) const
+void DatabaseOnDisk::removeDetachedPermanentlyFlag(ContextPtr, const String & table_name, const String & table_metadata_path, bool) const
 {
     try
     {
@@ -293,7 +295,7 @@ void DatabaseOnDisk::removeDetachedPermanentlyFlag(const Context &, const String
 
 void DatabaseOnDisk::commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
                                        const String & table_metadata_tmp_path, const String & table_metadata_path,
-                                       const Context & /*query_context*/)
+                                       ContextPtr /*query_context*/)
 {
     try
     {
@@ -311,7 +313,7 @@ void DatabaseOnDisk::commitCreateTable(const ASTCreateQuery & query, const Stora
     }
 }
 
-void DatabaseOnDisk::detachTablePermanently(const Context &, const String & table_name)
+void DatabaseOnDisk::detachTablePermanently(ContextPtr, const String & table_name)
 {
     auto table = detachTable(table_name);
 
@@ -327,7 +329,7 @@ void DatabaseOnDisk::detachTablePermanently(const Context &, const String & tabl
     }
 }
 
-void DatabaseOnDisk::dropTable(const Context & context, const String & table_name, bool /*no_delay*/)
+void DatabaseOnDisk::dropTable(ContextPtr local_context, const String & table_name, bool /*no_delay*/)
 {
     String table_metadata_path = getObjectMetadataPath(table_name);
     String table_metadata_path_drop = table_metadata_path + drop_suffix;
@@ -349,7 +351,7 @@ void DatabaseOnDisk::dropTable(const Context & context, const String & table_nam
         table->drop();
         table->is_dropped = true;
 
-        Poco::File table_data_dir{context.getPath() + table_data_path_relative};
+        Poco::File table_data_dir{local_context->getPath() + table_data_path_relative};
         if (table_data_dir.exists())
             table_data_dir.remove(true);
     }
@@ -387,7 +389,7 @@ void DatabaseOnDisk::checkMetadataFilenameAvailabilityUnlocked(const String & to
 }
 
 void DatabaseOnDisk::renameTable(
-        const Context & context,
+        ContextPtr local_context,
         const String & table_name,
         IDatabase & to_database,
         const String & to_table_name,
@@ -418,15 +420,16 @@ void DatabaseOnDisk::renameTable(
     String table_metadata_path;
     ASTPtr attach_query;
     /// DatabaseLazy::detachTable may return nullptr even if table exists, so we need tryGetTable for this case.
-    StoragePtr table = tryGetTable(table_name, global_context);
+    StoragePtr table = tryGetTable(table_name, getContext());
     detachTable(table_name);
     UUID prev_uuid = UUIDHelpers::Nil;
     try
     {
-        table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+        table_lock = table->lockExclusively(
+            local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
 
         table_metadata_path = getObjectMetadataPath(table_name);
-        attach_query = parseQueryFromMetadata(log, context, table_metadata_path);
+        attach_query = parseQueryFromMetadata(log, local_context, table_metadata_path);
         auto & create = attach_query->as<ASTCreateQuery &>();
         create.database = to_database.getDatabaseName();
         create.table = to_table_name;
@@ -454,7 +457,7 @@ void DatabaseOnDisk::renameTable(
     }
 
     /// Now table data are moved to new database, so we must add metadata and attach table to new database
-    to_database.createTable(context, to_table_name, table, attach_query);
+    to_database.createTable(local_context, to_table_name, table, attach_query);
 
     Poco::File(table_metadata_path).remove();
 
@@ -473,10 +476,10 @@ void DatabaseOnDisk::renameTable(
 
 
 /// It returns create table statement (even if table is detached)
-ASTPtr DatabaseOnDisk::getCreateTableQueryImpl(const String & table_name, const Context &, bool throw_on_error) const
+ASTPtr DatabaseOnDisk::getCreateTableQueryImpl(const String & table_name, ContextPtr, bool throw_on_error) const
 {
     ASTPtr ast;
-    bool has_table = tryGetTable(table_name, global_context) != nullptr;
+    bool has_table = tryGetTable(table_name, getContext()) != nullptr;
     auto table_metadata_path = getObjectMetadataPath(table_name);
     try
     {
@@ -497,11 +500,11 @@ ASTPtr DatabaseOnDisk::getCreateDatabaseQuery() const
 {
     ASTPtr ast;
 
-    auto settings = global_context.getSettingsRef();
+    auto settings = getContext()->getSettingsRef();
     {
         std::lock_guard lock(mutex);
-        auto database_metadata_path = global_context.getPath() + "metadata/" + escapeForFileName(database_name) + ".sql";
-        ast = parseQueryFromMetadata(log, global_context, database_metadata_path, true);
+        auto database_metadata_path = getContext()->getPath() + "metadata/" + escapeForFileName(database_name) + ".sql";
+        ast = parseQueryFromMetadata(log, getContext(), database_metadata_path, true);
         auto & ast_create_query = ast->as<ASTCreateQuery &>();
         ast_create_query.attach = false;
         ast_create_query.database = database_name;
@@ -518,10 +521,10 @@ ASTPtr DatabaseOnDisk::getCreateDatabaseQuery() const
     return ast;
 }
 
-void DatabaseOnDisk::drop(const Context & context)
+void DatabaseOnDisk::drop(ContextPtr local_context)
 {
     assert(tables.empty());
-    Poco::File(context.getPath() + getDataPath()).remove(false);
+    Poco::File(local_context->getPath() + getDataPath()).remove(false);
     Poco::File(getMetadataPath()).remove(false);
 }
 
@@ -541,14 +544,14 @@ time_t DatabaseOnDisk::getObjectMetadataModificationTime(const String & object_n
         return static_cast<time_t>(0);
 }
 
-void DatabaseOnDisk::iterateMetadataFiles(const Context & context, const IteratingFunction & process_metadata_file) const
+void DatabaseOnDisk::iterateMetadataFiles(ContextPtr local_context, const IteratingFunction & process_metadata_file) const
 {
     auto process_tmp_drop_metadata_file = [&](const String & file_name)
     {
         assert(getUUID() == UUIDHelpers::Nil);
         static const char * tmp_drop_ext = ".sql.tmp_drop";
         const std::string object_name = file_name.substr(0, file_name.size() - strlen(tmp_drop_ext));
-        if (Poco::File(context.getPath() + getDataPath() + '/' + object_name).exists())
+        if (Poco::File(local_context->getPath() + getDataPath() + '/' + object_name).exists())
         {
             Poco::File(getMetadataPath() + file_name).renameTo(getMetadataPath() + object_name + ".sql");
             LOG_WARNING(log, "Object {} was not dropped previously and will be restored", backQuote(object_name));
@@ -615,7 +618,12 @@ void DatabaseOnDisk::iterateMetadataFiles(const Context & context, const Iterati
     pool.wait();
 }
 
-ASTPtr DatabaseOnDisk::parseQueryFromMetadata(Poco::Logger * logger, const Context & context, const String & metadata_file_path, bool throw_on_error /*= true*/, bool remove_empty /*= false*/)
+ASTPtr DatabaseOnDisk::parseQueryFromMetadata(
+    Poco::Logger * logger,
+    ContextPtr local_context,
+    const String & metadata_file_path,
+    bool throw_on_error /*= true*/,
+    bool remove_empty /*= false*/)
 {
     String query;
 
@@ -643,7 +651,7 @@ ASTPtr DatabaseOnDisk::parseQueryFromMetadata(Poco::Logger * logger, const Conte
         return nullptr;
     }
 
-    auto settings = context.getSettingsRef();
+    auto settings = local_context->getSettingsRef();
     ParserCreateQuery parser;
     const char * pos = query.data();
     std::string error_message;
@@ -662,7 +670,12 @@ ASTPtr DatabaseOnDisk::parseQueryFromMetadata(Poco::Logger * logger, const Conte
         table_name = unescapeForFileName(table_name);
 
         if (create.table != TABLE_WITH_UUID_NAME_PLACEHOLDER && logger)
-            LOG_WARNING(logger, "File {} contains both UUID and table name. Will use name `{}` instead of `{}`", metadata_file_path, table_name, create.table);
+            LOG_WARNING(
+                logger,
+                "File {} contains both UUID and table name. Will use name `{}` instead of `{}`",
+                metadata_file_path,
+                table_name,
+                create.table);
         create.table = table_name;
     }
 
@@ -671,7 +684,7 @@ ASTPtr DatabaseOnDisk::parseQueryFromMetadata(Poco::Logger * logger, const Conte
 
 ASTPtr DatabaseOnDisk::getCreateQueryFromMetadata(const String & database_metadata_path, bool throw_on_error) const
 {
-    ASTPtr ast = parseQueryFromMetadata(log, global_context, database_metadata_path, throw_on_error);
+    ASTPtr ast = parseQueryFromMetadata(log, getContext(), database_metadata_path, throw_on_error);
 
     if (ast)
     {
diff --git a/src/Databases/DatabaseOnDisk.h b/src/Databases/DatabaseOnDisk.h
index b96a24f3345..677465e306e 100644
--- a/src/Databases/DatabaseOnDisk.h
+++ b/src/Databases/DatabaseOnDisk.h
@@ -16,7 +16,7 @@ std::pair<String, StoragePtr> createTableFromAST(
     ASTCreateQuery ast_create_query,
     const String & database_name,
     const String & table_data_path_relative,
-    Context & context,
+    ContextPtr context,
     bool has_force_restore_data_flag);
 
 /** Get the string with the table definition based on the CREATE query.
@@ -33,23 +33,23 @@ void applyMetadataChangesToCreateQuery(const ASTPtr & query, const StorageInMemo
 class DatabaseOnDisk : public DatabaseWithOwnTablesBase
 {
 public:
-    DatabaseOnDisk(const String & name, const String & metadata_path_, const String & data_path_, const String & logger, const Context & context);
+    DatabaseOnDisk(const String & name, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context);
 
     void createTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         const StoragePtr & table,
         const ASTPtr & query) override;
 
-    void detachTablePermanently(const Context & context, const String & table_name) override;
+    void detachTablePermanently(ContextPtr context, const String & table_name) override;
 
     void dropTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         bool no_delay) override;
 
     void renameTable(
-        const Context & context,
+        ContextPtr context,
         const String & table_name,
         IDatabase & to_database,
         const String & to_table_name,
@@ -58,7 +58,7 @@ public:
 
     ASTPtr getCreateDatabaseQuery() const override;
 
-    void drop(const Context & context) override;
+    void drop(ContextPtr context) override;
 
     String getObjectMetadataPath(const String & object_name) const override;
 
@@ -69,7 +69,7 @@ public:
     String getTableDataPath(const ASTCreateQuery & query) const override { return getTableDataPath(query.table); }
     String getMetadataPath() const override { return metadata_path; }
 
-    static ASTPtr parseQueryFromMetadata(Poco::Logger * log, const Context & context, const String & metadata_file_path, bool throw_on_error = true, bool remove_empty = false);
+    static ASTPtr parseQueryFromMetadata(Poco::Logger * log, ContextPtr context, const String & metadata_file_path, bool throw_on_error = true, bool remove_empty = false);
 
     /// will throw when the table we want to attach already exists (in active / detached / detached permanently form)
     void checkMetadataFilenameAvailability(const String & to_table_name) const;
@@ -82,19 +82,19 @@ protected:
 
     using IteratingFunction = std::function<void(const String &)>;
 
-    void iterateMetadataFiles(const Context & context, const IteratingFunction & process_metadata_file) const;
+    void iterateMetadataFiles(ContextPtr context, const IteratingFunction & process_metadata_file) const;
 
     ASTPtr getCreateTableQueryImpl(
         const String & table_name,
-        const Context & context,
+        ContextPtr context,
         bool throw_on_error) const override;
 
     ASTPtr getCreateQueryFromMetadata(const String & metadata_path, bool throw_on_error) const;
 
     virtual void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
-                                   const String & table_metadata_tmp_path, const String & table_metadata_path, const Context & query_context);
+                                   const String & table_metadata_tmp_path, const String & table_metadata_path, ContextPtr query_context);
 
-    virtual void removeDetachedPermanentlyFlag(const Context & context, const String & table_name, const String & table_metadata_path, bool attach) const;
+    virtual void removeDetachedPermanentlyFlag(ContextPtr context, const String & table_name, const String & table_metadata_path, bool attach) const;
 
     const String metadata_path;
     const String data_path;
diff --git a/src/Databases/DatabaseOrdinary.cpp b/src/Databases/DatabaseOrdinary.cpp
index a94668dacf7..840be0e006a 100644
--- a/src/Databases/DatabaseOrdinary.cpp
+++ b/src/Databases/DatabaseOrdinary.cpp
@@ -36,7 +36,7 @@ static constexpr size_t METADATA_FILE_BUFFER_SIZE = 32768;
 namespace
 {
     void tryAttachTable(
-        Context & context,
+        ContextPtr context,
         const ASTCreateQuery & query,
         DatabaseOrdinary & database,
         const String & database_name,
@@ -62,7 +62,7 @@ namespace
     }
 
 
-    void tryAttachDictionary(const ASTPtr & query, DatabaseOrdinary & database, const String & metadata_path, const Context & context)
+    void tryAttachDictionary(const ASTPtr & query, DatabaseOrdinary & database, const String & metadata_path, ContextPtr context)
     {
         auto & create_query = query->as<ASTCreateQuery &>();
         assert(create_query.is_dictionary);
@@ -94,18 +94,18 @@ namespace
 }
 
 
-DatabaseOrdinary::DatabaseOrdinary(const String & name_, const String & metadata_path_, const Context & context_)
+DatabaseOrdinary::DatabaseOrdinary(const String & name_, const String & metadata_path_, ContextPtr context_)
     : DatabaseOrdinary(name_, metadata_path_, "data/" + escapeForFileName(name_) + "/", "DatabaseOrdinary (" + name_ + ")", context_)
 {
 }
 
 DatabaseOrdinary::DatabaseOrdinary(
-    const String & name_, const String & metadata_path_, const String & data_path_, const String & logger, const Context & context_)
+    const String & name_, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context_)
     : DatabaseWithDictionaries(name_, metadata_path_, data_path_, logger, context_)
 {
 }
 
-void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool /*force_attach*/)
+void DatabaseOrdinary::loadStoredObjects(ContextPtr local_context, bool has_force_restore_data_flag, bool /*force_attach*/)
 {
     /** Tables load faster if they are loaded in sorted (by name) order.
       * Otherwise (for the ext4 filesystem), `DirectoryIterator` iterates through them in some order,
@@ -117,7 +117,8 @@ void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_resto
 
     size_t total_dictionaries = 0;
 
-    auto process_metadata = [&context, &file_names, &total_dictionaries, &file_names_mutex, this](const String & file_name)
+    auto process_metadata = [context_weak = ContextWeakPtr(local_context), &file_names, &total_dictionaries, &file_names_mutex, this](
+                                const String & file_name)
     {
         fs::path path(getMetadataPath());
         fs::path file_path(file_name);
@@ -125,7 +126,7 @@ void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_resto
 
         try
         {
-            auto ast = parseQueryFromMetadata(log, context, full_path.string(), /*throw_on_error*/ true, /*remove_empty*/ false);
+            auto ast = parseQueryFromMetadata(log, getContext(), full_path.string(), /*throw_on_error*/ true, /*remove_empty*/ false);
             if (ast)
             {
                 auto * create_query = ast->as<ASTCreateQuery>();
@@ -155,7 +156,7 @@ void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_resto
         }
     };
 
-    iterateMetadataFiles(context, process_metadata);
+    iterateMetadataFiles(local_context, process_metadata);
 
     size_t total_tables = file_names.size() - total_dictionaries;
 
@@ -180,7 +181,7 @@ void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_resto
         auto create_query = query->as<const ASTCreateQuery &>();
         if (create_query.is_dictionary)
         {
-            tryAttachDictionary(query, *this, getMetadataPath() + name, context);
+            tryAttachDictionary(query, *this, getMetadataPath() + name, local_context);
 
             /// Messages, so that it's not boring to wait for the server to load for a long time.
             logAboutProgress(log, ++dictionaries_processed, total_dictionaries, watch);
@@ -195,7 +196,7 @@ void DatabaseOrdinary::loadStoredObjects(Context & context, bool has_force_resto
             pool.scheduleOrThrowOnError([&]()
             {
                 tryAttachTable(
-                    context,
+                    local_context,
                     create_query,
                     *this,
                     database_name,
@@ -245,7 +246,7 @@ void DatabaseOrdinary::startupTables(ThreadPool & thread_pool)
     thread_pool.wait();
 }
 
-void DatabaseOrdinary::alterTable(const Context & context, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
+void DatabaseOrdinary::alterTable(ContextPtr local_context, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
 {
     String table_name = table_id.table_name;
     /// Read the definition of the table and replace the necessary parts with new ones.
@@ -265,7 +266,7 @@ void DatabaseOrdinary::alterTable(const Context & context, const StorageID & tab
         statement.data() + statement.size(),
         "in file " + table_metadata_path,
         0,
-        context.getSettingsRef().max_parser_depth);
+        local_context->getSettingsRef().max_parser_depth);
 
     applyMetadataChangesToCreateQuery(ast, metadata);
 
@@ -274,15 +275,15 @@ void DatabaseOrdinary::alterTable(const Context & context, const StorageID & tab
         WriteBufferFromFile out(table_metadata_tmp_path, statement.size(), O_WRONLY | O_CREAT | O_EXCL);
         writeString(statement, out);
         out.next();
-        if (context.getSettingsRef().fsync_metadata)
+        if (local_context->getSettingsRef().fsync_metadata)
             out.sync();
         out.close();
     }
 
-    commitAlterTable(table_id, table_metadata_tmp_path, table_metadata_path, statement, context);
+    commitAlterTable(table_id, table_metadata_tmp_path, table_metadata_path, statement, local_context);
 }
 
-void DatabaseOrdinary::commitAlterTable(const StorageID &, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & /*statement*/, const Context & /*query_context*/)
+void DatabaseOrdinary::commitAlterTable(const StorageID &, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & /*statement*/, ContextPtr /*query_context*/)
 {
     try
     {
diff --git a/src/Databases/DatabaseOrdinary.h b/src/Databases/DatabaseOrdinary.h
index c1ad32345f6..4cf58cef9f0 100644
--- a/src/Databases/DatabaseOrdinary.h
+++ b/src/Databases/DatabaseOrdinary.h
@@ -14,23 +14,26 @@ namespace DB
 class DatabaseOrdinary : public DatabaseWithDictionaries
 {
 public:
-    DatabaseOrdinary(const String & name_, const String & metadata_path_, const Context & context);
-    DatabaseOrdinary(const String & name_, const String & metadata_path_, const String & data_path_, const String & logger, const Context & context_);
+    DatabaseOrdinary(const String & name_, const String & metadata_path_, ContextPtr context);
+    DatabaseOrdinary(
+        const String & name_, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context_);
 
     String getEngineName() const override { return "Ordinary"; }
 
-    void loadStoredObjects(
-        Context & context,
-        bool has_force_restore_data_flag,
-        bool force_attach) override;
+    void loadStoredObjects(ContextPtr context, bool has_force_restore_data_flag, bool force_attach) override;
 
     void alterTable(
-        const Context & context,
+        ContextPtr context,
         const StorageID & table_id,
         const StorageInMemoryMetadata & metadata) override;
 
 protected:
-    virtual void commitAlterTable(const StorageID & table_id, const String & table_metadata_tmp_path, const String & table_metadata_path, const String & statement, const Context & query_context);
+    virtual void commitAlterTable(
+        const StorageID & table_id,
+        const String & table_metadata_tmp_path,
+        const String & table_metadata_path,
+        const String & statement,
+        ContextPtr query_context);
 
     void startupTables(ThreadPool & thread_pool);
 };
diff --git a/src/Databases/DatabaseReplicated.cpp b/src/Databases/DatabaseReplicated.cpp
index 664452abe6f..46d67e275ba 100644
--- a/src/Databases/DatabaseReplicated.cpp
+++ b/src/Databases/DatabaseReplicated.cpp
@@ -47,12 +47,12 @@ static constexpr const char * BROKEN_TABLES_SUFFIX = "_broken_tables";
 
 zkutil::ZooKeeperPtr DatabaseReplicated::getZooKeeper() const
 {
-    return global_context.getZooKeeper();
+    return getContext()->getZooKeeper();
 }
 
-static inline String getHostID(const Context & global_context, const UUID & db_uuid)
+static inline String getHostID(ContextPtr global_context, const UUID & db_uuid)
 {
-    return Cluster::Address::toString(getFQDNOrHostName(), global_context.getTCPPort()) + ':' + toString(db_uuid);
+    return Cluster::Address::toString(getFQDNOrHostName(), global_context->getTCPPort()) + ':' + toString(db_uuid);
 }
 
 
@@ -66,7 +66,7 @@ DatabaseReplicated::DatabaseReplicated(
     const String & shard_name_,
     const String & replica_name_,
     DatabaseReplicatedSettings db_settings_,
-    const Context & context_)
+    ContextPtr context_)
     : DatabaseAtomic(name_, metadata_path_, uuid, "DatabaseReplicated (" + name_ + ")", context_)
     , zookeeper_path(zookeeper_path_)
     , shard_name(shard_name_)
@@ -126,7 +126,7 @@ ClusterPtr DatabaseReplicated::getClusterImpl() const
     Strings hosts;
     Strings host_ids;
 
-    auto zookeeper = global_context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
     constexpr int max_retries = 10;
     int iteration = 0;
     bool success = false;
@@ -189,22 +189,22 @@ ClusterPtr DatabaseReplicated::getClusterImpl() const
 
     String username = db_settings.cluster_username;
     String password = db_settings.cluster_password;
-    UInt16 default_port = global_context.getTCPPort();
+    UInt16 default_port = getContext()->getTCPPort();
     bool secure = db_settings.cluster_secure_connection;
 
-    return std::make_shared<Cluster>(global_context.getSettingsRef(), shards, username, password, default_port, false, secure);
+    return std::make_shared<Cluster>(getContext()->getSettingsRef(), shards, username, password, default_port, false, secure);
 }
 
 void DatabaseReplicated::tryConnectToZooKeeperAndInitDatabase(bool force_attach)
 {
     try
     {
-        if (!global_context.hasZooKeeper())
+        if (!getContext()->hasZooKeeper())
         {
             throw Exception("Can't create replicated database without ZooKeeper", ErrorCodes::NO_ZOOKEEPER);
         }
 
-        auto current_zookeeper = global_context.getZooKeeper();
+        auto current_zookeeper = getContext()->getZooKeeper();
 
         if (!current_zookeeper->exists(zookeeper_path))
         {
@@ -217,7 +217,7 @@ void DatabaseReplicated::tryConnectToZooKeeperAndInitDatabase(bool force_attach)
         String replica_host_id;
         if (current_zookeeper->tryGet(replica_path, replica_host_id))
         {
-            String host_id = getHostID(global_context, db_uuid);
+            String host_id = getHostID(getContext(), db_uuid);
             if (replica_host_id != host_id)
                 throw Exception(ErrorCodes::REPLICA_IS_ALREADY_EXIST,
                                 "Replica {} of shard {} of replicated database at {} already exists. Replica host ID: '{}', current host ID: '{}'",
@@ -291,7 +291,7 @@ void DatabaseReplicated::createEmptyLogEntry(Coordination::Requests & ops, const
 void DatabaseReplicated::createReplicaNodesInZooKeeper(const zkutil::ZooKeeperPtr & current_zookeeper)
 {
     /// Write host name to replica_path, it will protect from multiple replicas with the same name
-    auto host_id = getHostID(global_context, db_uuid);
+    auto host_id = getHostID(getContext(), db_uuid);
 
     Coordination::Requests ops;
     ops.emplace_back(zkutil::makeCreateRequest(replica_path, host_id, zkutil::CreateMode::Persistent));
@@ -300,17 +300,17 @@ void DatabaseReplicated::createReplicaNodesInZooKeeper(const zkutil::ZooKeeperPt
     current_zookeeper->multi(ops);
 }
 
-void DatabaseReplicated::loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseReplicated::loadStoredObjects(ContextPtr local_context, bool has_force_restore_data_flag, bool force_attach)
 {
     tryConnectToZooKeeperAndInitDatabase(force_attach);
 
-    DatabaseAtomic::loadStoredObjects(context, has_force_restore_data_flag, force_attach);
+    DatabaseAtomic::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach);
 
-    ddl_worker = std::make_unique<DatabaseReplicatedDDLWorker>(this, global_context);
+    ddl_worker = std::make_unique<DatabaseReplicatedDDLWorker>(this, getContext());
     ddl_worker->startup();
 }
 
-void DatabaseReplicated::checkQueryValid(const ASTPtr & query, const Context & query_context) const
+void DatabaseReplicated::checkQueryValid(const ASTPtr & query, ContextPtr query_context) const
 {
     /// Replicas will set correct name of current database in query context (database name can be different on replicas)
     if (auto * ddl_query = dynamic_cast<ASTQueryWithTableAndOutput *>(query.get()))
@@ -343,12 +343,12 @@ void DatabaseReplicated::checkQueryValid(const ASTPtr & query, const Context & q
 
             Macros::MacroExpansionInfo info;
             info.table_id = {getDatabaseName(), create->table, create->uuid};
-            query_context.getMacros()->expand(maybe_path, info);
+            query_context->getMacros()->expand(maybe_path, info);
             bool maybe_shard_macros = info.expanded_other;
             info.expanded_other = false;
-            query_context.getMacros()->expand(maybe_replica, info);
+            query_context->getMacros()->expand(maybe_replica, info);
             bool maybe_replica_macros = info.expanded_other;
-            bool enable_functional_tests_helper = global_context.getConfigRef().has("_functional_tests_helper_database_replicated_replace_args_macros");
+            bool enable_functional_tests_helper = getContext()->getConfigRef().has("_functional_tests_helper_database_replicated_replace_args_macros");
 
             if (!enable_functional_tests_helper)
                 LOG_WARNING(log, "It's not recommended to explicitly specify zookeeper_path and replica_name in ReplicatedMergeTree arguments");
@@ -383,7 +383,7 @@ void DatabaseReplicated::checkQueryValid(const ASTPtr & query, const Context & q
 
     if (auto * query_drop = query->as<ASTDropQuery>())
     {
-        if (query_drop->kind == ASTDropQuery::Kind::Detach && query_context.getSettingsRef().database_replicated_always_detach_permanently)
+        if (query_drop->kind == ASTDropQuery::Kind::Detach && query_context->getSettingsRef().database_replicated_always_detach_permanently)
             query_drop->permanently = true;
         if (query_drop->kind == ASTDropQuery::Kind::Detach && !query_drop->permanently)
             throw Exception(ErrorCodes::INCORRECT_QUERY, "DETACH TABLE is not allowed for Replicated databases. "
@@ -392,12 +392,12 @@ void DatabaseReplicated::checkQueryValid(const ASTPtr & query, const Context & q
     }
 }
 
-BlockIO DatabaseReplicated::tryEnqueueReplicatedDDL(const ASTPtr & query, const Context & query_context)
+BlockIO DatabaseReplicated::tryEnqueueReplicatedDDL(const ASTPtr & query, ContextPtr query_context)
 {
     if (is_readonly)
         throw Exception(ErrorCodes::NO_ZOOKEEPER, "Database is in readonly mode, because it cannot connect to ZooKeeper");
 
-    if (query_context.getClientInfo().query_kind != ClientInfo::QueryKind::INITIAL_QUERY)
+    if (query_context->getClientInfo().query_kind != ClientInfo::QueryKind::INITIAL_QUERY)
         throw Exception(ErrorCodes::INCORRECT_QUERY, "It's not initial query. ON CLUSTER is not allowed for Replicated database.");
 
     checkQueryValid(query, query_context);
@@ -413,15 +413,15 @@ BlockIO DatabaseReplicated::tryEnqueueReplicatedDDL(const ASTPtr & query, const
     return getDistributedDDLStatus(node_path, entry, query_context, hosts_to_wait);
 }
 
-static UUID getTableUUIDIfReplicated(const String & metadata, const Context & context)
+static UUID getTableUUIDIfReplicated(const String & metadata, ContextPtr context)
 {
     bool looks_like_replicated = metadata.find("ReplicatedMergeTree") != std::string::npos;
     if (!looks_like_replicated)
         return UUIDHelpers::Nil;
 
     ParserCreateQuery parser;
-    auto size = context.getSettingsRef().max_query_size;
-    auto depth = context.getSettingsRef().max_parser_depth;
+    auto size = context->getSettingsRef().max_query_size;
+    auto depth = context->getSettingsRef().max_parser_depth;
     ASTPtr query = parseQuery(parser, metadata, size, depth);
     const ASTCreateQuery & create = query->as<const ASTCreateQuery &>();
     if (!create.storage || !create.storage->engine)
@@ -457,7 +457,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
     std::unordered_map<UUID, String> zk_replicated_id_to_name;
     for (const auto & zk_table : table_name_to_metadata)
     {
-        UUID zk_replicated_id = getTableUUIDIfReplicated(zk_table.second, global_context);
+        UUID zk_replicated_id = getTableUUIDIfReplicated(zk_table.second, getContext());
         if (zk_replicated_id != UUIDHelpers::Nil)
             zk_replicated_id_to_name.emplace(zk_replicated_id, zk_table.first);
     }
@@ -467,7 +467,8 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
     std::vector<std::pair<String, String>> replicated_tables_to_rename;
     size_t total_tables = 0;
     std::vector<UUID> replicated_ids;
-    for (auto existing_tables_it = getTablesIterator(global_context, {}); existing_tables_it->isValid(); existing_tables_it->next(), ++total_tables)
+    for (auto existing_tables_it = getTablesIterator(getContext(), {}); existing_tables_it->isValid();
+         existing_tables_it->next(), ++total_tables)
     {
         String name = existing_tables_it->name();
         UUID local_replicated_id = UUIDHelpers::Nil;
@@ -506,7 +507,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
         /// We use Ordinary engine for destination database, because it's the only way to discard table UUID
         /// and make possible creation of new table with the same UUID.
         String query = fmt::format("CREATE DATABASE IF NOT EXISTS {} ENGINE=Ordinary", backQuoteIfNeed(to_db_name));
-        Context query_context = global_context;
+        auto query_context = Context::createCopy(getContext());
         executeQuery(query, query_context, true);
     }
 
@@ -519,12 +520,12 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
         if (getDatabaseName() != db_name)
             throw Exception(ErrorCodes::UNKNOWN_DATABASE, "Database was renamed, will retry");
 
-        auto table = tryGetTable(table_name, global_context);
+        auto table = tryGetTable(table_name, getContext());
         if (isDictionaryExist(table_name))
         {
             /// We can safely drop any dictionaries because they do not store data
             LOG_DEBUG(log, "Will DROP DICTIONARY {}", backQuoteIfNeed(table_name));
-            DatabaseAtomic::removeDictionary(global_context, table_name);
+            DatabaseAtomic::removeDictionary(getContext(), table_name);
             ++dropped_dicts;
         }
         else if (!table->storesDataOnDisk())
@@ -532,7 +533,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
             LOG_DEBUG(log, "Will DROP TABLE {}, because it does not store data on disk and can be safely dropped", backQuoteIfNeed(table_name));
             dropped_tables.push_back(tryGetTableUUID(table_name));
             table->shutdown();
-            DatabaseAtomic::dropTable(global_context, table_name, true);
+            DatabaseAtomic::dropTable(getContext(), table_name, true);
         }
         else
         {
@@ -542,7 +543,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
             assert(db_name < to_db_name);
             DDLGuardPtr to_table_guard = DatabaseCatalog::instance().getDDLGuard(to_db_name, to_name);
             auto to_db_ptr = DatabaseCatalog::instance().getDatabase(to_db_name);
-            DatabaseAtomic::renameTable(global_context, table_name, *to_db_ptr, to_name, false, false);
+            DatabaseAtomic::renameTable(getContext(), table_name, *to_db_ptr, to_name, false, false);
             ++moved_tables;
         }
     }
@@ -561,7 +562,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
         /// TODO Maybe we should do it in two steps: rename all tables to temporary names and then rename them to actual names?
         DDLGuardPtr table_guard = DatabaseCatalog::instance().getDDLGuard(db_name, std::min(from, to));
         DDLGuardPtr to_table_guard = DatabaseCatalog::instance().getDDLGuard(db_name, std::max(from, to));
-        DatabaseAtomic::renameTable(global_context, from, *this, to, false, false);
+        DatabaseAtomic::renameTable(getContext(), from, *this, to, false, false);
     }
 
     for (const auto & id : dropped_tables)
@@ -569,7 +570,7 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
 
     for (const auto & name_and_meta : table_name_to_metadata)
     {
-        if (isTableExist(name_and_meta.first, global_context))
+        if (isTableExist(name_and_meta.first, getContext()))
         {
             assert(name_and_meta.second == readMetadataFile(name_and_meta.first));
             continue;
@@ -577,11 +578,11 @@ void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeep
 
         auto query_ast = parseQueryFromMetadataInZooKeeper(name_and_meta.first, name_and_meta.second);
 
-        Context query_context = global_context;
-        query_context.makeQueryContext();
-        query_context.getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
-        query_context.setCurrentDatabase(database_name);
-        query_context.setCurrentQueryId(""); // generate random query_id
+        auto query_context = Context::createCopy(getContext());
+        query_context->makeQueryContext();
+        query_context->getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
+        query_context->setCurrentDatabase(database_name);
+        query_context->setCurrentQueryId(""); // generate random query_id
 
         LOG_INFO(log, "Executing {}", serializeAST(*query_ast));
         InterpreterCreateQuery(query_ast, query_context).execute();
@@ -643,7 +644,7 @@ ASTPtr DatabaseReplicated::parseQueryFromMetadataInZooKeeper(const String & node
 {
     ParserCreateQuery parser;
     String description = "in ZooKeeper " + zookeeper_path + "/metadata/" + node_name;
-    auto ast = parseQuery(parser, query, description, 0, global_context.getSettingsRef().max_parser_depth);
+    auto ast = parseQuery(parser, query, description, 0, getContext()->getSettingsRef().max_parser_depth);
 
     auto & create = ast->as<ASTCreateQuery &>();
     if (create.uuid == UUIDHelpers::Nil || create.table != TABLE_WITH_UUID_NAME_PLACEHOLDER || !create.database.empty())
@@ -658,7 +659,7 @@ ASTPtr DatabaseReplicated::parseQueryFromMetadataInZooKeeper(const String & node
     return ast;
 }
 
-void DatabaseReplicated::drop(const Context & context_)
+void DatabaseReplicated::drop(ContextPtr context_)
 {
     auto current_zookeeper = getZooKeeper();
     Coordination::Requests ops;
@@ -691,22 +692,22 @@ void DatabaseReplicated::shutdown()
 }
 
 
-void DatabaseReplicated::dropTable(const Context & context, const String & table_name, bool no_delay)
+void DatabaseReplicated::dropTable(ContextPtr local_context, const String & table_name, bool no_delay)
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn || startsWith(table_name, ".inner_id."));
     if (txn && txn->isInitialQuery())
     {
         String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
         txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
     }
-    DatabaseAtomic::dropTable(context, table_name, no_delay);
+    DatabaseAtomic::dropTable(local_context, table_name, no_delay);
 }
 
-void DatabaseReplicated::renameTable(const Context & context, const String & table_name, IDatabase & to_database,
+void DatabaseReplicated::renameTable(ContextPtr local_context, const String & table_name, IDatabase & to_database,
                                      const String & to_table_name, bool exchange, bool dictionary)
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(txn);
 
     if (txn->isInitialQuery())
@@ -715,9 +716,9 @@ void DatabaseReplicated::renameTable(const Context & context, const String & tab
             throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Moving tables between databases is not supported for Replicated engine");
         if (table_name == to_table_name)
             throw Exception(ErrorCodes::INCORRECT_QUERY, "Cannot rename table to itself");
-        if (!isTableExist(table_name, context))
+        if (!isTableExist(table_name, local_context))
             throw Exception(ErrorCodes::UNKNOWN_TABLE, "Table {} does not exist", table_name);
-        if (exchange && !to_database.isTableExist(to_table_name, context))
+        if (exchange && !to_database.isTableExist(to_table_name, local_context))
             throw Exception(ErrorCodes::UNKNOWN_TABLE, "Table {} does not exist", to_table_name);
 
         String statement = readMetadataFile(table_name);
@@ -733,14 +734,14 @@ void DatabaseReplicated::renameTable(const Context & context, const String & tab
         txn->addOp(zkutil::makeCreateRequest(metadata_zk_path_to, statement, zkutil::CreateMode::Persistent));
     }
 
-    DatabaseAtomic::renameTable(context, table_name, to_database, to_table_name, exchange, dictionary);
+    DatabaseAtomic::renameTable(local_context, table_name, to_database, to_table_name, exchange, dictionary);
 }
 
 void DatabaseReplicated::commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
                        const String & table_metadata_tmp_path, const String & table_metadata_path,
-                       const Context & query_context)
+                       ContextPtr query_context)
 {
-    auto txn = query_context.getZooKeeperMetadataTransaction();
+    auto txn = query_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn);
     if (txn && txn->isInitialQuery())
     {
@@ -754,9 +755,9 @@ void DatabaseReplicated::commitCreateTable(const ASTCreateQuery & query, const S
 
 void DatabaseReplicated::commitAlterTable(const StorageID & table_id,
                                           const String & table_metadata_tmp_path, const String & table_metadata_path,
-                                          const String & statement, const Context & query_context)
+                                          const String & statement, ContextPtr query_context)
 {
-    auto txn = query_context.getZooKeeperMetadataTransaction();
+    auto txn = query_context->getZooKeeperMetadataTransaction();
     if (txn && txn->isInitialQuery())
     {
         String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_id.table_name);
@@ -765,11 +766,11 @@ void DatabaseReplicated::commitAlterTable(const StorageID & table_id,
     DatabaseAtomic::commitAlterTable(table_id, table_metadata_tmp_path, table_metadata_path, statement, query_context);
 }
 
-void DatabaseReplicated::createDictionary(const Context & context,
+void DatabaseReplicated::createDictionary(ContextPtr local_context,
                                           const String & dictionary_name,
                                           const ASTPtr & query)
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn);
     if (txn && txn->isInitialQuery())
     {
@@ -777,24 +778,24 @@ void DatabaseReplicated::createDictionary(const Context & context,
         String statement = getObjectDefinitionFromCreateQuery(query->clone());
         txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement, zkutil::CreateMode::Persistent));
     }
-    DatabaseAtomic::createDictionary(context, dictionary_name, query);
+    DatabaseAtomic::createDictionary(local_context, dictionary_name, query);
 }
 
-void DatabaseReplicated::removeDictionary(const Context & context, const String & dictionary_name)
+void DatabaseReplicated::removeDictionary(ContextPtr local_context, const String & dictionary_name)
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn);
     if (txn && txn->isInitialQuery())
     {
         String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(dictionary_name);
         txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
     }
-    DatabaseAtomic::removeDictionary(context, dictionary_name);
+    DatabaseAtomic::removeDictionary(local_context, dictionary_name);
 }
 
-void DatabaseReplicated::detachTablePermanently(const Context & context, const String & table_name)
+void DatabaseReplicated::detachTablePermanently(ContextPtr local_context, const String & table_name)
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn);
     if (txn && txn->isInitialQuery())
     {
@@ -803,12 +804,12 @@ void DatabaseReplicated::detachTablePermanently(const Context & context, const S
         String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
         txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
     }
-    DatabaseAtomic::detachTablePermanently(context, table_name);
+    DatabaseAtomic::detachTablePermanently(local_context, table_name);
 }
 
-void DatabaseReplicated::removeDetachedPermanentlyFlag(const Context & context, const String & table_name, const String & table_metadata_path, bool attach) const
+void DatabaseReplicated::removeDetachedPermanentlyFlag(ContextPtr local_context, const String & table_name, const String & table_metadata_path, bool attach) const
 {
-    auto txn = context.getZooKeeperMetadataTransaction();
+    auto txn = local_context->getZooKeeperMetadataTransaction();
     assert(!ddl_worker->isCurrentlyActive() || txn);
     if (txn && txn->isInitialQuery() && attach)
     {
@@ -816,7 +817,7 @@ void DatabaseReplicated::removeDetachedPermanentlyFlag(const Context & context,
         String statement = readMetadataFile(table_name);
         txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement, zkutil::CreateMode::Persistent));
     }
-    DatabaseAtomic::removeDetachedPermanentlyFlag(context, table_name, table_metadata_path, attach);
+    DatabaseAtomic::removeDetachedPermanentlyFlag(local_context, table_name, table_metadata_path, attach);
 }
 
 
diff --git a/src/Databases/DatabaseReplicated.h b/src/Databases/DatabaseReplicated.h
index 46bcdc71ef1..5220535f095 100644
--- a/src/Databases/DatabaseReplicated.h
+++ b/src/Databases/DatabaseReplicated.h
@@ -24,32 +24,32 @@ public:
     DatabaseReplicated(const String & name_, const String & metadata_path_, UUID uuid,
                        const String & zookeeper_path_, const String & shard_name_, const String & replica_name_,
                        DatabaseReplicatedSettings db_settings_,
-                       const Context & context);
+                       ContextPtr context);
 
     ~DatabaseReplicated() override;
 
     String getEngineName() const override { return "Replicated"; }
 
     /// If current query is initial, then the following methods add metadata updating ZooKeeper operations to current ZooKeeperMetadataTransaction.
-    void dropTable(const Context &, const String & table_name, bool no_delay) override;
-    void renameTable(const Context & context, const String & table_name, IDatabase & to_database,
+    void dropTable(ContextPtr, const String & table_name, bool no_delay) override;
+    void renameTable(ContextPtr context, const String & table_name, IDatabase & to_database,
                      const String & to_table_name, bool exchange, bool dictionary) override;
     void commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
                            const String & table_metadata_tmp_path, const String & table_metadata_path,
-                           const Context & query_context) override;
+                           ContextPtr query_context) override;
     void commitAlterTable(const StorageID & table_id,
                           const String & table_metadata_tmp_path, const String & table_metadata_path,
-                          const String & statement, const Context & query_context) override;
-    void createDictionary(const Context & context,
+                          const String & statement, ContextPtr query_context) override;
+    void createDictionary(ContextPtr context,
                           const String & dictionary_name,
                           const ASTPtr & query) override;
-    void removeDictionary(const Context & context, const String & dictionary_name) override;
-    void detachTablePermanently(const Context & context, const String & table_name) override;
-    void removeDetachedPermanentlyFlag(const Context & context, const String & table_name, const String & table_metadata_path, bool attach) const override;
+    void removeDictionary(ContextPtr context, const String & dictionary_name) override;
+    void detachTablePermanently(ContextPtr context, const String & table_name) override;
+    void removeDetachedPermanentlyFlag(ContextPtr context, const String & table_name, const String & table_metadata_path, bool attach) const override;
 
     /// Try to execute DLL query on current host as initial query. If query is succeed,
     /// then it will be executed on all replicas.
-    BlockIO tryEnqueueReplicatedDDL(const ASTPtr & query, const Context & query_context);
+    BlockIO tryEnqueueReplicatedDDL(const ASTPtr & query, ContextPtr query_context);
 
     void stopReplication();
 
@@ -59,9 +59,9 @@ public:
     /// Returns cluster consisting of database replicas
     ClusterPtr getCluster() const;
 
-    void drop(const Context & /*context*/) override;
+    void drop(ContextPtr /*context*/) override;
 
-    void loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextPtr context, bool has_force_restore_data_flag, bool force_attach) override;
     void shutdown() override;
 
     friend struct DatabaseReplicatedTask;
@@ -71,7 +71,7 @@ private:
     bool createDatabaseNodesInZooKeeper(const ZooKeeperPtr & current_zookeeper);
     void createReplicaNodesInZooKeeper(const ZooKeeperPtr & current_zookeeper);
 
-    void checkQueryValid(const ASTPtr & query, const Context & query_context) const;
+    void checkQueryValid(const ASTPtr & query, ContextPtr query_context) const;
 
     void recoverLostReplica(const ZooKeeperPtr & current_zookeeper, UInt32 our_log_ptr, UInt32 max_log_ptr);
     std::map<String, String> tryGetConsistentMetadataSnapshot(const ZooKeeperPtr & zookeeper, UInt32 & max_log_ptr);
diff --git a/src/Databases/DatabaseReplicatedWorker.cpp b/src/Databases/DatabaseReplicatedWorker.cpp
index 63f4d89b216..9ae4d026bf0 100644
--- a/src/Databases/DatabaseReplicatedWorker.cpp
+++ b/src/Databases/DatabaseReplicatedWorker.cpp
@@ -13,7 +13,7 @@ namespace ErrorCodes
     extern const int UNFINISHED;
 }
 
-DatabaseReplicatedDDLWorker::DatabaseReplicatedDDLWorker(DatabaseReplicated * db, const Context & context_)
+DatabaseReplicatedDDLWorker::DatabaseReplicatedDDLWorker(DatabaseReplicated * db, ContextPtr context_)
     : DDLWorker(/* pool_size */ 1, db->zookeeper_path + "/log", context_, nullptr, {}, fmt::format("DDLWorker({})", db->getDatabaseName()))
     , database(db)
 {
@@ -91,7 +91,7 @@ String DatabaseReplicatedDDLWorker::enqueueQuery(DDLLogEntry & entry)
     return node_path;
 }
 
-String DatabaseReplicatedDDLWorker::tryEnqueueAndExecuteEntry(DDLLogEntry & entry, const Context & query_context)
+String DatabaseReplicatedDDLWorker::tryEnqueueAndExecuteEntry(DDLLogEntry & entry, ContextPtr query_context)
 {
     /// NOTE Possibly it would be better to execute initial query on the most up-to-date node,
     /// but it requires more complex logic around /try node.
@@ -115,7 +115,7 @@ String DatabaseReplicatedDDLWorker::tryEnqueueAndExecuteEntry(DDLLogEntry & entr
     task->is_initial_query = true;
 
     LOG_DEBUG(log, "Waiting for worker thread to process all entries before {}", entry_name);
-    UInt64 timeout = query_context.getSettingsRef().database_replicated_initial_query_timeout_sec;
+    UInt64 timeout = query_context->getSettingsRef().database_replicated_initial_query_timeout_sec;
     {
         std::unique_lock lock{mutex};
         bool processed = wait_current_task_change.wait_for(lock, std::chrono::seconds(timeout), [&]()
diff --git a/src/Databases/DatabaseReplicatedWorker.h b/src/Databases/DatabaseReplicatedWorker.h
index 3a45817c755..16ad100b81a 100644
--- a/src/Databases/DatabaseReplicatedWorker.h
+++ b/src/Databases/DatabaseReplicatedWorker.h
@@ -21,11 +21,11 @@ class DatabaseReplicated;
 class DatabaseReplicatedDDLWorker : public DDLWorker
 {
 public:
-    DatabaseReplicatedDDLWorker(DatabaseReplicated * db, const Context & context_);
+    DatabaseReplicatedDDLWorker(DatabaseReplicated * db, ContextPtr context_);
 
     String enqueueQuery(DDLLogEntry & entry) override;
 
-    String tryEnqueueAndExecuteEntry(DDLLogEntry & entry, const Context & query_context);
+    String tryEnqueueAndExecuteEntry(DDLLogEntry & entry, ContextPtr query_context);
 
     void shutdown() override;
 
diff --git a/src/Databases/DatabaseWithDictionaries.cpp b/src/Databases/DatabaseWithDictionaries.cpp
index 55b04f27c58..5180b251a5f 100644
--- a/src/Databases/DatabaseWithDictionaries.cpp
+++ b/src/Databases/DatabaseWithDictionaries.cpp
@@ -125,9 +125,9 @@ void DatabaseWithDictionaries::detachDictionaryImpl(const String & dictionary_na
         detachTable(dictionary_name);
 }
 
-void DatabaseWithDictionaries::createDictionary(const Context & context, const String & dictionary_name, const ASTPtr & query)
+void DatabaseWithDictionaries::createDictionary(ContextPtr local_context, const String & dictionary_name, const ASTPtr & query)
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
 
     /** The code is based on the assumption that all threads share the same order of operations:
       * - create the .sql.tmp file;
@@ -151,7 +151,7 @@ void DatabaseWithDictionaries::createDictionary(const Context & context, const S
         throw Exception(ErrorCodes::DICTIONARY_ALREADY_EXISTS,
                         "Dictionary {} already exists.", dict_id.getFullNameNotQuoted());
 
-    if (isTableExist(dictionary_name, global_context))
+    if (isTableExist(dictionary_name, getContext()))
         throw Exception(ErrorCodes::TABLE_ALREADY_EXISTS, "Table {} already exists.", dict_id.getFullTableName());
 
     String dictionary_metadata_path = getObjectMetadataPath(dictionary_name);
@@ -177,9 +177,9 @@ void DatabaseWithDictionaries::createDictionary(const Context & context, const S
     /// Add a temporary repository containing the dictionary.
     /// We need this temp repository to try loading the dictionary before actually attaching it to the database.
     auto temp_repository = external_loader.addConfigRepository(std::make_unique<ExternalLoaderTempConfigRepository>(
-        getDatabaseName(), dictionary_metadata_tmp_path, getDictionaryConfigurationFromAST(query->as<const ASTCreateQuery &>(), context)));
+        getDatabaseName(), dictionary_metadata_tmp_path, getDictionaryConfigurationFromAST(query->as<const ASTCreateQuery &>(), local_context)));
 
-    bool lazy_load = context.getConfigRef().getBool("dictionaries_lazy_load", true);
+    bool lazy_load = local_context->getConfigRef().getBool("dictionaries_lazy_load", true);
     if (!lazy_load)
     {
         /// load() is called here to force loading the dictionary, wait until the loading is finished,
@@ -187,15 +187,15 @@ void DatabaseWithDictionaries::createDictionary(const Context & context, const S
         external_loader.load(dict_id.getInternalDictionaryName());
     }
 
-    auto config = getDictionaryConfigurationFromAST(query->as<const ASTCreateQuery &>(), context);
+    auto config = getDictionaryConfigurationFromAST(query->as<const ASTCreateQuery &>(), local_context);
     attachDictionary(dictionary_name, DictionaryAttachInfo{query, config, time(nullptr)});
     SCOPE_EXIT({
         if (!succeeded)
             detachDictionary(dictionary_name);
     });
 
-    auto txn = context.getZooKeeperMetadataTransaction();
-    if (txn && !context.isInternalSubquery())
+    auto txn = local_context->getZooKeeperMetadataTransaction();
+    if (txn && !local_context->isInternalSubquery())
         txn->commit();      /// Commit point (a sort of) for Replicated database
 
     /// If it was ATTACH query and file with dictionary metadata already exist
@@ -210,7 +210,7 @@ void DatabaseWithDictionaries::createDictionary(const Context & context, const S
     succeeded = true;
 }
 
-void DatabaseWithDictionaries::removeDictionary(const Context & context, const String & dictionary_name)
+void DatabaseWithDictionaries::removeDictionary(ContextPtr local_context, const String & dictionary_name)
 {
     DictionaryAttachInfo attach_info;
     detachDictionaryImpl(dictionary_name, attach_info);
@@ -219,8 +219,8 @@ void DatabaseWithDictionaries::removeDictionary(const Context & context, const S
     {
         String dictionary_metadata_path = getObjectMetadataPath(dictionary_name);
 
-        auto txn = context.getZooKeeperMetadataTransaction();
-        if (txn && !context.isInternalSubquery())
+        auto txn = local_context->getZooKeeperMetadataTransaction();
+        if (txn && !local_context->isInternalSubquery())
             txn->commit();      /// Commit point (a sort of) for Replicated database
 
         Poco::File(dictionary_metadata_path).remove();
@@ -335,7 +335,7 @@ void DatabaseWithDictionaries::reloadDictionaryConfig(const String & full_name)
     /// Ensure that this database is attached to ExternalLoader as a config repository.
     if (!database_as_config_repo_for_external_loader.load())
     {
-        auto repository = std::make_unique<ExternalLoaderDatabaseConfigRepository>(*this, global_context);
+        auto repository = std::make_unique<ExternalLoaderDatabaseConfigRepository>(*this, getContext());
         auto remove_repository_callback = external_loader.addConfigRepository(std::move(repository));
         database_as_config_repo_for_external_loader = boost::make_shared<ext::scope_guard>(std::move(remove_repository_callback));
     }
@@ -359,9 +359,9 @@ void DatabaseWithDictionaries::shutdown()
 
 
 DatabaseWithDictionaries::DatabaseWithDictionaries(
-    const String & name, const String & metadata_path_, const String & data_path_, const String & logger, const Context & context)
-    : DatabaseOnDisk(name, metadata_path_, data_path_, logger, context)
-    , external_loader(context.getExternalDictionariesLoader())
+    const String & name, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context_)
+    : DatabaseOnDisk(name, metadata_path_, data_path_, logger, context_)
+    , external_loader(context_->getExternalDictionariesLoader())
 {
 }
 
diff --git a/src/Databases/DatabaseWithDictionaries.h b/src/Databases/DatabaseWithDictionaries.h
index d69289d7456..d10908c7c06 100644
--- a/src/Databases/DatabaseWithDictionaries.h
+++ b/src/Databases/DatabaseWithDictionaries.h
@@ -17,11 +17,11 @@ public:
 
     void detachDictionary(const String & dictionary_name) override;
 
-    void createDictionary(const Context & context,
+    void createDictionary(ContextPtr context,
                           const String & dictionary_name,
                           const ASTPtr & query) override;
 
-    void removeDictionary(const Context & context, const String & dictionary_name) override;
+    void removeDictionary(ContextPtr context, const String & dictionary_name) override;
 
     bool isDictionaryExist(const String & dictionary_name) const override;
 
@@ -38,7 +38,7 @@ public:
     ~DatabaseWithDictionaries() override;
 
 protected:
-    DatabaseWithDictionaries(const String & name, const String & metadata_path_, const String & data_path_, const String & logger, const Context & context);
+    DatabaseWithDictionaries(const String & name, const String & metadata_path_, const String & data_path_, const String & logger, ContextPtr context);
 
     ASTPtr getCreateDictionaryQueryImpl(const String & dictionary_name, bool throw_on_error) const override;
 
diff --git a/src/Databases/DatabasesCommon.cpp b/src/Databases/DatabasesCommon.cpp
index 2d3d206162b..9329b0a4210 100644
--- a/src/Databases/DatabasesCommon.cpp
+++ b/src/Databases/DatabasesCommon.cpp
@@ -20,18 +20,18 @@ namespace ErrorCodes
     extern const int UNKNOWN_DATABASE;
 }
 
-DatabaseWithOwnTablesBase::DatabaseWithOwnTablesBase(const String & name_, const String & logger, const Context & context)
-        : IDatabase(name_), log(&Poco::Logger::get(logger)), global_context(context.getGlobalContext())
+DatabaseWithOwnTablesBase::DatabaseWithOwnTablesBase(const String & name_, const String & logger, ContextPtr context_)
+        : IDatabase(name_), WithContext(context_->getGlobalContext()), log(&Poco::Logger::get(logger))
 {
 }
 
-bool DatabaseWithOwnTablesBase::isTableExist(const String & table_name, const Context &) const
+bool DatabaseWithOwnTablesBase::isTableExist(const String & table_name, ContextPtr) const
 {
     std::lock_guard lock(mutex);
     return tables.find(table_name) != tables.end();
 }
 
-StoragePtr DatabaseWithOwnTablesBase::tryGetTable(const String & table_name, const Context &) const
+StoragePtr DatabaseWithOwnTablesBase::tryGetTable(const String & table_name, ContextPtr) const
 {
     std::lock_guard lock(mutex);
     auto it = tables.find(table_name);
@@ -40,7 +40,7 @@ StoragePtr DatabaseWithOwnTablesBase::tryGetTable(const String & table_name, con
     return {};
 }
 
-DatabaseTablesIteratorPtr DatabaseWithOwnTablesBase::getTablesIterator(const Context &, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseWithOwnTablesBase::getTablesIterator(ContextPtr, const FilterByNameFunction & filter_by_table_name)
 {
     std::lock_guard lock(mutex);
     if (!filter_by_table_name)
diff --git a/src/Databases/DatabasesCommon.h b/src/Databases/DatabasesCommon.h
index 5e1e555a524..da1bd6c1852 100644
--- a/src/Databases/DatabasesCommon.h
+++ b/src/Databases/DatabasesCommon.h
@@ -16,12 +16,12 @@ namespace DB
 class Context;
 
 /// A base class for databases that manage their own list of tables.
-class DatabaseWithOwnTablesBase : public IDatabase
+class DatabaseWithOwnTablesBase : public IDatabase, protected WithContext
 {
 public:
-    bool isTableExist(const String & table_name, const Context & context) const override;
+    bool isTableExist(const String & table_name, ContextPtr context) const override;
 
-    StoragePtr tryGetTable(const String & table_name, const Context & context) const override;
+    StoragePtr tryGetTable(const String & table_name, ContextPtr context) const override;
 
     bool empty() const override;
 
@@ -29,7 +29,7 @@ public:
 
     StoragePtr detachTable(const String & table_name) override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
     void shutdown() override;
 
@@ -38,9 +38,8 @@ public:
 protected:
     Tables tables;
     Poco::Logger * log;
-    const Context & global_context;
 
-    DatabaseWithOwnTablesBase(const String & name_, const String & logger, const Context & context);
+    DatabaseWithOwnTablesBase(const String & name_, const String & logger, ContextPtr context);
 
     void attachTableUnlocked(const String & table_name, const StoragePtr & table, std::unique_lock<std::mutex> & lock);
     StoragePtr detachTableUnlocked(const String & table_name, std::unique_lock<std::mutex> & lock);
diff --git a/src/Databases/IDatabase.h b/src/Databases/IDatabase.h
index 3a196f827b7..6cd0e468709 100644
--- a/src/Databases/IDatabase.h
+++ b/src/Databases/IDatabase.h
@@ -10,6 +10,7 @@
 
 #include <boost/range/adaptor/map.hpp>
 #include <boost/range/algorithm/copy.hpp>
+
 #include <ctime>
 #include <functional>
 #include <memory>
@@ -18,7 +19,6 @@
 namespace DB
 {
 
-class Context;
 struct Settings;
 struct ConstraintsDescription;
 struct IndicesDescription;
@@ -153,10 +153,10 @@ public:
 
     /// Load a set of existing tables.
     /// You can call only once, right after the object is created.
-    virtual void loadStoredObjects(Context & /*context*/, bool /*has_force_restore_data_flag*/, bool /*force_attach*/ = false) {}
+    virtual void loadStoredObjects(ContextPtr /*context*/, bool /*has_force_restore_data_flag*/, bool /*force_attach*/ = false) {}
 
     /// Check the existence of the table.
-    virtual bool isTableExist(const String & name, const Context & context) const = 0;
+    virtual bool isTableExist(const String & name, ContextPtr context) const = 0;
 
     /// Check the existence of the dictionary
     virtual bool isDictionaryExist(const String & /*name*/) const
@@ -165,7 +165,7 @@ public:
     }
 
     /// Get the table for work. Return nullptr if there is no table.
-    virtual StoragePtr tryGetTable(const String & name, const Context & context) const = 0;
+    virtual StoragePtr tryGetTable(const String & name, ContextPtr context) const = 0;
 
     virtual UUID tryGetTableUUID(const String & /*table_name*/) const { return UUIDHelpers::Nil; }
 
@@ -173,7 +173,7 @@ public:
 
     /// Get an iterator that allows you to pass through all the tables.
     /// It is possible to have "hidden" tables that are not visible when passing through, but are visible if you get them by name using the functions above.
-    virtual DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name = {}) = 0;
+    virtual DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name = {}) = 0;
 
     /// Get an iterator to pass through all the dictionaries.
     virtual DatabaseDictionariesIteratorPtr getDictionariesIterator([[maybe_unused]] const FilterByNameFunction & filter_by_dictionary_name = {})
@@ -186,7 +186,7 @@ public:
 
     /// Add the table to the database. Record its presence in the metadata.
     virtual void createTable(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const String & /*name*/,
         const StoragePtr & /*table*/,
         const ASTPtr & /*query*/)
@@ -196,7 +196,7 @@ public:
 
     /// Add the dictionary to the database. Record its presence in the metadata.
     virtual void createDictionary(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const String & /*dictionary_name*/,
         const ASTPtr & /*query*/)
     {
@@ -205,7 +205,7 @@ public:
 
     /// Delete the table from the database, drop table and delete the metadata.
     virtual void dropTable(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const String & /*name*/,
         [[maybe_unused]] bool no_delay = false)
     {
@@ -214,7 +214,7 @@ public:
 
     /// Delete the dictionary from the database. Delete the metadata.
     virtual void removeDictionary(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const String & /*dictionary_name*/)
     {
         throw Exception("There is no DROP DICTIONARY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
@@ -249,14 +249,14 @@ public:
 
     /// Forget about the table without deleting it's data, but rename metadata file to prevent reloading it
     /// with next restart. The database may not support this method.
-    virtual void detachTablePermanently(const Context & /*context*/, const String & /*name*/)
+    virtual void detachTablePermanently(ContextPtr /*context*/, const String & /*name*/)
     {
         throw Exception("There is no DETACH TABLE PERMANENTLY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
     }
 
     /// Rename the table and possibly move the table to another database.
     virtual void renameTable(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const String & /*name*/,
         IDatabase & /*to_database*/,
         const String & /*to_name*/,
@@ -271,7 +271,7 @@ public:
     /// Change the table structure in metadata.
     /// You must call under the alter_lock of the corresponding table . If engine_modifier is empty, then engine does not change.
     virtual void alterTable(
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         const StorageID & /*table_id*/,
         const StorageInMemoryMetadata & /*metadata*/)
     {
@@ -285,12 +285,12 @@ public:
     }
 
     /// Get the CREATE TABLE query for the table. It can also provide information for detached tables for which there is metadata.
-    ASTPtr tryGetCreateTableQuery(const String & name, const Context & context) const noexcept
+    ASTPtr tryGetCreateTableQuery(const String & name, ContextPtr context) const noexcept
     {
         return getCreateTableQueryImpl(name, context, false);
     }
 
-    ASTPtr getCreateTableQuery(const String & name, const Context & context) const
+    ASTPtr getCreateTableQuery(const String & name, ContextPtr context) const
     {
         return getCreateTableQueryImpl(name, context, true);
     }
@@ -351,12 +351,12 @@ public:
     virtual void shutdown() = 0;
 
     /// Delete data and metadata stored inside the database, if exists.
-    virtual void drop(const Context & /*context*/) {}
+    virtual void drop(ContextPtr /*context*/) {}
 
-    virtual ~IDatabase() {}
+    virtual ~IDatabase() = default;
 
 protected:
-    virtual ASTPtr getCreateTableQueryImpl(const String & /*name*/, const Context & /*context*/, bool throw_on_error) const
+    virtual ASTPtr getCreateTableQueryImpl(const String & /*name*/, ContextPtr /*context*/, bool throw_on_error) const
     {
         if (throw_on_error)
             throw Exception("There is no SHOW CREATE TABLE query for Database" + getEngineName(), ErrorCodes::CANNOT_GET_CREATE_TABLE_QUERY);
diff --git a/src/Databases/MySQL/ConnectionMySQLSettings.cpp b/src/Databases/MySQL/ConnectionMySQLSettings.cpp
index fa92e793225..1026d14018b 100644
--- a/src/Databases/MySQL/ConnectionMySQLSettings.cpp
+++ b/src/Databases/MySQL/ConnectionMySQLSettings.cpp
@@ -50,12 +50,12 @@ void ConnectionMySQLSettings::loadFromQuery(ASTStorage & storage_def)
 #undef ADD_IF_ABSENT
 }
 
-void ConnectionMySQLSettings::loadFromQueryContext(const Context & context)
+void ConnectionMySQLSettings::loadFromQueryContext(ContextPtr context)
 {
-    if (!context.hasQueryContext())
+    if (!context->hasQueryContext())
         return;
 
-    const Settings & settings = context.getQueryContext().getSettingsRef();
+    const Settings & settings = context->getQueryContext()->getSettingsRef();
 
     if (settings.mysql_datatypes_support_level.value != mysql_datatypes_support_level.value)
         set("mysql_datatypes_support_level", settings.mysql_datatypes_support_level.toString());
diff --git a/src/Databases/MySQL/ConnectionMySQLSettings.h b/src/Databases/MySQL/ConnectionMySQLSettings.h
index ce2773307c5..f05985a0cda 100644
--- a/src/Databases/MySQL/ConnectionMySQLSettings.h
+++ b/src/Databases/MySQL/ConnectionMySQLSettings.h
@@ -1,13 +1,13 @@
 #pragma once
 
-#include <Core/Defines.h>
 #include <Core/BaseSettings.h>
+#include <Core/Defines.h>
 #include <Core/SettingsEnums.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
 
-class Context;
 class ASTStorage;
 
 #define LIST_OF_CONNECTION_MYSQL_SETTINGS(M) \
@@ -27,7 +27,7 @@ struct ConnectionMySQLSettings : public BaseSettings<ConnectionMySQLSettingsTrai
 {
     void loadFromQuery(ASTStorage & storage_def);
 
-    void loadFromQueryContext(const Context & context);
+    void loadFromQueryContext(ContextPtr context);
 };
 
 }
diff --git a/src/Databases/MySQL/DatabaseConnectionMySQL.cpp b/src/Databases/MySQL/DatabaseConnectionMySQL.cpp
index 053144913b0..9615aa85e05 100644
--- a/src/Databases/MySQL/DatabaseConnectionMySQL.cpp
+++ b/src/Databases/MySQL/DatabaseConnectionMySQL.cpp
@@ -46,7 +46,7 @@ static constexpr const std::chrono::seconds cleaner_sleep_time{30};
 static const std::chrono::seconds lock_acquire_timeout{10};
 
 DatabaseConnectionMySQL::DatabaseConnectionMySQL(
-    const Context & context,
+    ContextPtr context_,
     const String & database_name_,
     const String & metadata_path_,
     const ASTStorage * database_engine_define_,
@@ -54,7 +54,7 @@ DatabaseConnectionMySQL::DatabaseConnectionMySQL(
     std::unique_ptr<ConnectionMySQLSettings> settings_,
     mysqlxx::PoolWithFailover && pool)
     : IDatabase(database_name_)
-    , global_context(context.getGlobalContext())
+    , WithContext(context_->getGlobalContext())
     , metadata_path(metadata_path_)
     , database_engine_define(database_engine_define_->clone())
     , database_name_in_mysql(database_name_in_mysql_)
@@ -69,7 +69,7 @@ bool DatabaseConnectionMySQL::empty() const
 {
     std::lock_guard<std::mutex> lock(mutex);
 
-    fetchTablesIntoLocalCache(global_context);
+    fetchTablesIntoLocalCache(getContext());
 
     if (local_tables_cache.empty())
         return true;
@@ -81,12 +81,12 @@ bool DatabaseConnectionMySQL::empty() const
     return true;
 }
 
-DatabaseTablesIteratorPtr DatabaseConnectionMySQL::getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name)
+DatabaseTablesIteratorPtr DatabaseConnectionMySQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & filter_by_table_name)
 {
     Tables tables;
     std::lock_guard<std::mutex> lock(mutex);
 
-    fetchTablesIntoLocalCache(context);
+    fetchTablesIntoLocalCache(local_context);
 
     for (const auto & [table_name, modify_time_and_storage] : local_tables_cache)
         if (!remove_or_detach_tables.count(table_name) && (!filter_by_table_name || filter_by_table_name(table_name)))
@@ -95,16 +95,16 @@ DatabaseTablesIteratorPtr DatabaseConnectionMySQL::getTablesIterator(const Conte
     return std::make_unique<DatabaseTablesSnapshotIterator>(tables, database_name);
 }
 
-bool DatabaseConnectionMySQL::isTableExist(const String & name, const Context & context) const
+bool DatabaseConnectionMySQL::isTableExist(const String & name, ContextPtr local_context) const
 {
-    return bool(tryGetTable(name, context));
+    return bool(tryGetTable(name, local_context));
 }
 
-StoragePtr DatabaseConnectionMySQL::tryGetTable(const String & mysql_table_name, const Context & context) const
+StoragePtr DatabaseConnectionMySQL::tryGetTable(const String & mysql_table_name, ContextPtr local_context) const
 {
     std::lock_guard<std::mutex> lock(mutex);
 
-    fetchTablesIntoLocalCache(context);
+    fetchTablesIntoLocalCache(local_context);
 
     if (!remove_or_detach_tables.count(mysql_table_name) && local_tables_cache.find(mysql_table_name) != local_tables_cache.end())
         return local_tables_cache[mysql_table_name].second;
@@ -159,11 +159,11 @@ static ASTPtr getCreateQueryFromStorage(const StoragePtr & storage, const ASTPtr
     return create_table_query;
 }
 
-ASTPtr DatabaseConnectionMySQL::getCreateTableQueryImpl(const String & table_name, const Context & context, bool throw_on_error) const
+ASTPtr DatabaseConnectionMySQL::getCreateTableQueryImpl(const String & table_name, ContextPtr local_context, bool throw_on_error) const
 {
     std::lock_guard<std::mutex> lock(mutex);
 
-    fetchTablesIntoLocalCache(context);
+    fetchTablesIntoLocalCache(local_context);
 
     if (local_tables_cache.find(table_name) == local_tables_cache.end())
     {
@@ -180,7 +180,7 @@ time_t DatabaseConnectionMySQL::getObjectMetadataModificationTime(const String &
 {
     std::lock_guard<std::mutex> lock(mutex);
 
-    fetchTablesIntoLocalCache(global_context);
+    fetchTablesIntoLocalCache(getContext());
 
     if (local_tables_cache.find(table_name) == local_tables_cache.end())
         throw Exception("MySQL table " + database_name_in_mysql + "." + table_name + " doesn't exist.", ErrorCodes::UNKNOWN_TABLE);
@@ -196,12 +196,12 @@ ASTPtr DatabaseConnectionMySQL::getCreateDatabaseQuery() const
     return create_query;
 }
 
-void DatabaseConnectionMySQL::fetchTablesIntoLocalCache(const Context & context) const
+void DatabaseConnectionMySQL::fetchTablesIntoLocalCache(ContextPtr local_context) const
 {
     const auto & tables_with_modification_time = fetchTablesWithModificationTime();
 
     destroyLocalCacheExtraTables(tables_with_modification_time);
-    fetchLatestTablesStructureIntoCache(tables_with_modification_time, context);
+    fetchLatestTablesStructureIntoCache(tables_with_modification_time, local_context);
 }
 
 void DatabaseConnectionMySQL::destroyLocalCacheExtraTables(const std::map<String, UInt64> & tables_with_modification_time) const
@@ -218,7 +218,8 @@ void DatabaseConnectionMySQL::destroyLocalCacheExtraTables(const std::map<String
     }
 }
 
-void DatabaseConnectionMySQL::fetchLatestTablesStructureIntoCache(const std::map<String, UInt64> &tables_modification_time, const Context & context) const
+void DatabaseConnectionMySQL::fetchLatestTablesStructureIntoCache(
+    const std::map<String, UInt64> & tables_modification_time, ContextPtr local_context) const
 {
     std::vector<String> wait_update_tables_name;
     for (const auto & table_modification_time : tables_modification_time)
@@ -230,7 +231,7 @@ void DatabaseConnectionMySQL::fetchLatestTablesStructureIntoCache(const std::map
             wait_update_tables_name.emplace_back(table_modification_time.first);
     }
 
-    std::map<String, NamesAndTypesList> tables_and_columns = fetchTablesColumnsList(wait_update_tables_name, context);
+    std::map<String, NamesAndTypesList> tables_and_columns = fetchTablesColumnsList(wait_update_tables_name, local_context);
 
     for (const auto & table_and_columns : tables_and_columns)
     {
@@ -247,7 +248,7 @@ void DatabaseConnectionMySQL::fetchLatestTablesStructureIntoCache(const std::map
 
         local_tables_cache[table_name] = std::make_pair(table_modification_time, StorageMySQL::create(
             StorageID(database_name, table_name), std::move(mysql_pool), database_name_in_mysql, table_name,
-            false, "", ColumnsDescription{columns_name_and_type}, ConstraintsDescription{}, global_context));
+            false, "", ColumnsDescription{columns_name_and_type}, ConstraintsDescription{}, getContext()));
     }
 }
 
@@ -282,9 +283,10 @@ std::map<String, UInt64> DatabaseConnectionMySQL::fetchTablesWithModificationTim
     return tables_with_modification_time;
 }
 
-std::map<String, NamesAndTypesList> DatabaseConnectionMySQL::fetchTablesColumnsList(const std::vector<String> & tables_name, const Context & context) const
+std::map<String, NamesAndTypesList>
+DatabaseConnectionMySQL::fetchTablesColumnsList(const std::vector<String> & tables_name, ContextPtr local_context) const
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
 
     return DB::fetchTablesColumnsList(
             mysql_pool,
@@ -309,7 +311,7 @@ void DatabaseConnectionMySQL::shutdown()
     local_tables_cache.clear();
 }
 
-void DatabaseConnectionMySQL::drop(const Context & /*context*/)
+void DatabaseConnectionMySQL::drop(ContextPtr /*context*/)
 {
     Poco::File(getMetadataPath()).remove(true);
 }
@@ -384,7 +386,7 @@ String DatabaseConnectionMySQL::getMetadataPath() const
     return metadata_path;
 }
 
-void DatabaseConnectionMySQL::loadStoredObjects(Context &, bool, bool /*force_attach*/)
+void DatabaseConnectionMySQL::loadStoredObjects(ContextPtr, bool, bool /*force_attach*/)
 {
 
     std::lock_guard<std::mutex> lock{mutex};
@@ -401,7 +403,7 @@ void DatabaseConnectionMySQL::loadStoredObjects(Context &, bool, bool /*force_at
     }
 }
 
-void DatabaseConnectionMySQL::detachTablePermanently(const Context &, const String & table_name)
+void DatabaseConnectionMySQL::detachTablePermanently(ContextPtr, const String & table_name)
 {
     std::lock_guard<std::mutex> lock{mutex};
 
@@ -435,9 +437,9 @@ void DatabaseConnectionMySQL::detachTablePermanently(const Context &, const Stri
     table_iter->second.second->is_dropped = true;
 }
 
-void DatabaseConnectionMySQL::dropTable(const Context & context, const String & table_name, bool /*no_delay*/)
+void DatabaseConnectionMySQL::dropTable(ContextPtr local_context, const String & table_name, bool /*no_delay*/)
 {
-    detachTablePermanently(context, table_name);
+    detachTablePermanently(local_context, table_name);
 }
 
 DatabaseConnectionMySQL::~DatabaseConnectionMySQL()
@@ -462,7 +464,7 @@ DatabaseConnectionMySQL::~DatabaseConnectionMySQL()
     }
 }
 
-void DatabaseConnectionMySQL::createTable(const Context &, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query)
+void DatabaseConnectionMySQL::createTable(ContextPtr, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query)
 {
     const auto & create = create_query->as<ASTCreateQuery>();
 
@@ -473,7 +475,7 @@ void DatabaseConnectionMySQL::createTable(const Context &, const String & table_
     /// XXX: hack
     /// In order to prevent users from broken the table structure by executing attach table database_name.table_name (...)
     /// we should compare the old and new create_query to make them completely consistent
-    const auto & origin_create_query = getCreateTableQuery(table_name, global_context);
+    const auto & origin_create_query = getCreateTableQuery(table_name, getContext());
     origin_create_query->as<ASTCreateQuery>()->attach = true;
 
     if (queryToString(origin_create_query) != queryToString(create_query))
diff --git a/src/Databases/MySQL/DatabaseConnectionMySQL.h b/src/Databases/MySQL/DatabaseConnectionMySQL.h
index 8aa53fe14ec..a626924d6dd 100644
--- a/src/Databases/MySQL/DatabaseConnectionMySQL.h
+++ b/src/Databases/MySQL/DatabaseConnectionMySQL.h
@@ -31,13 +31,13 @@ enum class MySQLDataTypesSupport;
  *  It doesn't make any manipulations with filesystem.
  *  All tables are created by calling code after real-time pull-out structure from remote MySQL
  */
-class DatabaseConnectionMySQL final : public IDatabase
+class DatabaseConnectionMySQL final : public IDatabase, WithContext
 {
 public:
     ~DatabaseConnectionMySQL() override;
 
     DatabaseConnectionMySQL(
-        const Context & context,
+        ContextPtr context,
         const String & database_name,
         const String & metadata_path,
         const ASTStorage * database_engine_define,
@@ -55,39 +55,38 @@ public:
 
     bool empty() const override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
     ASTPtr getCreateDatabaseQuery() const override;
 
-    bool isTableExist(const String & name, const Context & context) const override;
+    bool isTableExist(const String & name, ContextPtr context) const override;
 
-    StoragePtr tryGetTable(const String & name, const Context & context) const override;
+    StoragePtr tryGetTable(const String & name, ContextPtr context) const override;
 
     time_t getObjectMetadataModificationTime(const String & name) const override;
 
     void shutdown() override;
 
-    void drop(const Context & /*context*/) override;
+    void drop(ContextPtr /*context*/) override;
 
     String getMetadataPath() const override;
 
-    void createTable(const Context &, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
+    void createTable(ContextPtr, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
 
-    void loadStoredObjects(Context &, bool, bool force_attach) override;
+    void loadStoredObjects(ContextPtr, bool, bool force_attach) override;
 
     StoragePtr detachTable(const String & table_name) override;
 
-    void detachTablePermanently(const Context & context, const String & table_name) override;
+    void detachTablePermanently(ContextPtr context, const String & table_name) override;
 
-    void dropTable(const Context & context, const String & table_name, bool no_delay) override;
+    void dropTable(ContextPtr context, const String & table_name, bool no_delay) override;
 
     void attachTable(const String & table_name, const StoragePtr & storage, const String & relative_table_path) override;
 
 protected:
-    ASTPtr getCreateTableQueryImpl(const String & name, const Context & context, bool throw_on_error) const override;
+    ASTPtr getCreateTableQueryImpl(const String & name, ContextPtr context, bool throw_on_error) const override;
 
 private:
-    const Context & global_context;
     String metadata_path;
     ASTPtr database_engine_define;
     String database_name_in_mysql;
@@ -107,15 +106,15 @@ private:
 
     void cleanOutdatedTables();
 
-    void fetchTablesIntoLocalCache(const Context & context) const;
+    void fetchTablesIntoLocalCache(ContextPtr context) const;
 
     std::map<String, UInt64> fetchTablesWithModificationTime() const;
 
-    std::map<String, NamesAndTypesList> fetchTablesColumnsList(const std::vector<String> & tables_name, const Context & context) const;
+    std::map<String, NamesAndTypesList> fetchTablesColumnsList(const std::vector<String> & tables_name, ContextPtr context) const;
 
     void destroyLocalCacheExtraTables(const std::map<String, UInt64> & tables_with_modification_time) const;
 
-    void fetchLatestTablesStructureIntoCache(const std::map<String, UInt64> & tables_modification_time, const Context & context) const;
+    void fetchLatestTablesStructureIntoCache(const std::map<String, UInt64> & tables_modification_time, ContextPtr context) const;
 
     ThreadFromGlobalPool thread;
 };
diff --git a/src/Databases/MySQL/DatabaseMaterializeMySQL.cpp b/src/Databases/MySQL/DatabaseMaterializeMySQL.cpp
index 8edeabee004..62a66b22c93 100644
--- a/src/Databases/MySQL/DatabaseMaterializeMySQL.cpp
+++ b/src/Databases/MySQL/DatabaseMaterializeMySQL.cpp
@@ -26,27 +26,40 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-template<>
+template <>
 DatabaseMaterializeMySQL<DatabaseOrdinary>::DatabaseMaterializeMySQL(
-    const Context & context, const String & database_name_, const String & metadata_path_, UUID /*uuid*/,
-    const String & mysql_database_name_, mysqlxx::Pool && pool_, MySQLClient && client_, std::unique_ptr<MaterializeMySQLSettings> settings_)
-    : DatabaseOrdinary(database_name_
-                      , metadata_path_
-                      , "data/" + escapeForFileName(database_name_) + "/"
-                      , "DatabaseMaterializeMySQL<Ordinary> (" + database_name_ + ")", context
-                      )
+    ContextPtr context_,
+    const String & database_name_,
+    const String & metadata_path_,
+    UUID /*uuid*/,
+    const String & mysql_database_name_,
+    mysqlxx::Pool && pool_,
+    MySQLClient && client_,
+    std::unique_ptr<MaterializeMySQLSettings> settings_)
+    : DatabaseOrdinary(
+        database_name_,
+        metadata_path_,
+        "data/" + escapeForFileName(database_name_) + "/",
+        "DatabaseMaterializeMySQL<Ordinary> (" + database_name_ + ")",
+        context_)
     , settings(std::move(settings_))
-    , materialize_thread(context, database_name_, mysql_database_name_, std::move(pool_), std::move(client_), settings.get())
+    , materialize_thread(context_, database_name_, mysql_database_name_, std::move(pool_), std::move(client_), settings.get())
 {
 }
 
-template<>
+template <>
 DatabaseMaterializeMySQL<DatabaseAtomic>::DatabaseMaterializeMySQL(
-    const Context & context, const String & database_name_, const String & metadata_path_, UUID uuid,
-    const String & mysql_database_name_, mysqlxx::Pool && pool_, MySQLClient && client_, std::unique_ptr<MaterializeMySQLSettings> settings_)
-    : DatabaseAtomic(database_name_, metadata_path_, uuid, "DatabaseMaterializeMySQL<Atomic> (" + database_name_ + ")", context)
+    ContextPtr context_,
+    const String & database_name_,
+    const String & metadata_path_,
+    UUID uuid,
+    const String & mysql_database_name_,
+    mysqlxx::Pool && pool_,
+    MySQLClient && client_,
+    std::unique_ptr<MaterializeMySQLSettings> settings_)
+    : DatabaseAtomic(database_name_, metadata_path_, uuid, "DatabaseMaterializeMySQL<Atomic> (" + database_name_ + ")", context_)
     , settings(std::move(settings_))
-    , materialize_thread(context, database_name_, mysql_database_name_, std::move(pool_), std::move(client_), settings.get())
+    , materialize_thread(context_, database_name_, mysql_database_name_, std::move(pool_), std::move(client_), settings.get())
 {
 }
 
@@ -79,9 +92,9 @@ void DatabaseMaterializeMySQL<Base>::setException(const std::exception_ptr & exc
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseMaterializeMySQL<Base>::loadStoredObjects(ContextPtr context_, bool has_force_restore_data_flag, bool force_attach)
 {
-    Base::loadStoredObjects(context, has_force_restore_data_flag, force_attach);
+    Base::loadStoredObjects(context_, has_force_restore_data_flag, force_attach);
     if (!force_attach)
         materialize_thread.assertMySQLAvailable();
 
@@ -90,17 +103,17 @@ void DatabaseMaterializeMySQL<Base>::loadStoredObjects(Context & context, bool h
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::createTable(const Context & context, const String & name, const StoragePtr & table, const ASTPtr & query)
+void DatabaseMaterializeMySQL<Base>::createTable(ContextPtr context_, const String & name, const StoragePtr & table, const ASTPtr & query)
 {
     assertCalledFromSyncThreadOrDrop("create table");
-    Base::createTable(context, name, table, query);
+    Base::createTable(context_, name, table, query);
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::dropTable(const Context & context, const String & name, bool no_delay)
+void DatabaseMaterializeMySQL<Base>::dropTable(ContextPtr context_, const String & name, bool no_delay)
 {
     assertCalledFromSyncThreadOrDrop("drop table");
-    Base::dropTable(context, name, no_delay);
+    Base::dropTable(context_, name, no_delay);
 }
 
 template<typename Base>
@@ -118,7 +131,7 @@ StoragePtr DatabaseMaterializeMySQL<Base>::detachTable(const String & name)
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::renameTable(const Context & context, const String & name, IDatabase & to_database, const String & to_name, bool exchange, bool dictionary)
+void DatabaseMaterializeMySQL<Base>::renameTable(ContextPtr context_, const String & name, IDatabase & to_database, const String & to_name, bool exchange, bool dictionary)
 {
     assertCalledFromSyncThreadOrDrop("rename table");
 
@@ -131,18 +144,18 @@ void DatabaseMaterializeMySQL<Base>::renameTable(const Context & context, const
     if (to_database.getDatabaseName() != Base::getDatabaseName())
         throw Exception("Cannot rename with other database for MaterializeMySQL database.", ErrorCodes::NOT_IMPLEMENTED);
 
-    Base::renameTable(context, name, *this, to_name, exchange, dictionary);
+    Base::renameTable(context_, name, *this, to_name, exchange, dictionary);
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::alterTable(const Context & context, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
+void DatabaseMaterializeMySQL<Base>::alterTable(ContextPtr context_, const StorageID & table_id, const StorageInMemoryMetadata & metadata)
 {
     assertCalledFromSyncThreadOrDrop("alter table");
-    Base::alterTable(context, table_id, metadata);
+    Base::alterTable(context_, table_id, metadata);
 }
 
 template<typename Base>
-void DatabaseMaterializeMySQL<Base>::drop(const Context & context)
+void DatabaseMaterializeMySQL<Base>::drop(ContextPtr context_)
 {
     /// Remove metadata info
     Poco::File metadata(Base::getMetadataPath() + "/.metadata");
@@ -150,15 +163,15 @@ void DatabaseMaterializeMySQL<Base>::drop(const Context & context)
     if (metadata.exists())
         metadata.remove(false);
 
-    Base::drop(context);
+    Base::drop(context_);
 }
 
 template<typename Base>
-StoragePtr DatabaseMaterializeMySQL<Base>::tryGetTable(const String & name, const Context & context) const
+StoragePtr DatabaseMaterializeMySQL<Base>::tryGetTable(const String & name, ContextPtr context_) const
 {
     if (!MaterializeMySQLSyncThread::isMySQLSyncThread())
     {
-        StoragePtr nested_storage = Base::tryGetTable(name, context);
+        StoragePtr nested_storage = Base::tryGetTable(name, context_);
 
         if (!nested_storage)
             return {};
@@ -166,19 +179,20 @@ StoragePtr DatabaseMaterializeMySQL<Base>::tryGetTable(const String & name, cons
         return std::make_shared<StorageMaterializeMySQL>(std::move(nested_storage), this);
     }
 
-    return Base::tryGetTable(name, context);
+    return Base::tryGetTable(name, context_);
 }
 
-template<typename Base>
-DatabaseTablesIteratorPtr DatabaseMaterializeMySQL<Base>::getTablesIterator(const Context & context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name)
+template <typename Base>
+DatabaseTablesIteratorPtr
+DatabaseMaterializeMySQL<Base>::getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name)
 {
     if (!MaterializeMySQLSyncThread::isMySQLSyncThread())
     {
-        DatabaseTablesIteratorPtr iterator = Base::getTablesIterator(context, filter_by_table_name);
+        DatabaseTablesIteratorPtr iterator = Base::getTablesIterator(context_, filter_by_table_name);
         return std::make_unique<DatabaseMaterializeTablesIterator>(std::move(iterator), this);
     }
 
-    return Base::getTablesIterator(context, filter_by_table_name);
+    return Base::getTablesIterator(context_, filter_by_table_name);
 }
 
 template<typename Base>
diff --git a/src/Databases/MySQL/DatabaseMaterializeMySQL.h b/src/Databases/MySQL/DatabaseMaterializeMySQL.h
index e1229269a33..cd9fe640239 100644
--- a/src/Databases/MySQL/DatabaseMaterializeMySQL.h
+++ b/src/Databases/MySQL/DatabaseMaterializeMySQL.h
@@ -23,7 +23,7 @@ class DatabaseMaterializeMySQL : public Base
 public:
 
     DatabaseMaterializeMySQL(
-        const Context & context, const String & database_name_, const String & metadata_path_, UUID uuid,
+        ContextPtr context, const String & database_name_, const String & metadata_path_, UUID uuid,
         const String & mysql_database_name_, mysqlxx::Pool && pool_,
         MySQLClient && client_, std::unique_ptr<MaterializeMySQLSettings> settings_);
 
@@ -43,25 +43,25 @@ protected:
 public:
     String getEngineName() const override { return "MaterializeMySQL"; }
 
-    void loadStoredObjects(Context & context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextPtr context_, bool has_force_restore_data_flag, bool force_attach) override;
 
-    void createTable(const Context & context, const String & name, const StoragePtr & table, const ASTPtr & query) override;
+    void createTable(ContextPtr context_, const String & name, const StoragePtr & table, const ASTPtr & query) override;
 
-    void dropTable(const Context & context, const String & name, bool no_delay) override;
+    void dropTable(ContextPtr context_, const String & name, bool no_delay) override;
 
     void attachTable(const String & name, const StoragePtr & table, const String & relative_table_path) override;
 
     StoragePtr detachTable(const String & name) override;
 
-    void renameTable(const Context & context, const String & name, IDatabase & to_database, const String & to_name, bool exchange, bool dictionary) override;
+    void renameTable(ContextPtr context_, const String & name, IDatabase & to_database, const String & to_name, bool exchange, bool dictionary) override;
 
-    void alterTable(const Context & context, const StorageID & table_id, const StorageInMemoryMetadata & metadata) override;
+    void alterTable(ContextPtr context_, const StorageID & table_id, const StorageInMemoryMetadata & metadata) override;
 
-    void drop(const Context & context) override;
+    void drop(ContextPtr context_) override;
 
-    StoragePtr tryGetTable(const String & name, const Context & context) const override;
+    StoragePtr tryGetTable(const String & name, ContextPtr context_) const override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context_, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) override;
 
     void assertCalledFromSyncThreadOrDrop(const char * method) const;
 
diff --git a/src/Databases/MySQL/MaterializeMySQLSyncThread.cpp b/src/Databases/MySQL/MaterializeMySQLSyncThread.cpp
index 8d1c1e109ac..b8e135eef32 100644
--- a/src/Databases/MySQL/MaterializeMySQLSyncThread.cpp
+++ b/src/Databases/MySQL/MaterializeMySQLSyncThread.cpp
@@ -41,30 +41,30 @@ namespace ErrorCodes
 
 static constexpr auto MYSQL_BACKGROUND_THREAD_NAME = "MySQLDBSync";
 
-static Context createQueryContext(const Context & global_context)
+static ContextPtr createQueryContext(ContextPtr context)
 {
-    Settings new_query_settings = global_context.getSettings();
+    Settings new_query_settings = context->getSettings();
     new_query_settings.insert_allow_materialized_columns = true;
 
     /// To avoid call AST::format
     /// TODO: We need to implement the format function for MySQLAST
     new_query_settings.enable_global_with_statement = false;
 
-    Context query_context(global_context);
-    query_context.setSettings(new_query_settings);
+    auto query_context = Context::createCopy(context);
+    query_context->setSettings(new_query_settings);
     CurrentThread::QueryScope query_scope(query_context);
 
-    query_context.getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
-    query_context.setCurrentQueryId(""); // generate random query_id
+    query_context->getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
+    query_context->setCurrentQueryId(""); // generate random query_id
     return query_context;
 }
 
-static BlockIO tryToExecuteQuery(const String & query_to_execute, Context & query_context, const String & database, const String & comment)
+static BlockIO tryToExecuteQuery(const String & query_to_execute, ContextPtr query_context, const String & database, const String & comment)
 {
     try
     {
         if (!database.empty())
-            query_context.setCurrentDatabase(database);
+            query_context->setCurrentDatabase(database);
 
         return executeQuery("/*" + comment + "*/ " + query_to_execute, query_context, true);
     }
@@ -143,10 +143,19 @@ static void checkMySQLVariables(const mysqlxx::Pool::Entry & connection)
 }
 
 MaterializeMySQLSyncThread::MaterializeMySQLSyncThread(
-    const Context & context, const String & database_name_, const String & mysql_database_name_,
-    mysqlxx::Pool && pool_, MySQLClient && client_, MaterializeMySQLSettings * settings_)
-    : log(&Poco::Logger::get("MaterializeMySQLSyncThread")), global_context(context.getGlobalContext()), database_name(database_name_)
-    , mysql_database_name(mysql_database_name_), pool(std::move(pool_)), client(std::move(client_)), settings(settings_)
+    ContextPtr context_,
+    const String & database_name_,
+    const String & mysql_database_name_,
+    mysqlxx::Pool && pool_,
+    MySQLClient && client_,
+    MaterializeMySQLSettings * settings_)
+    : WithContext(context_->getGlobalContext())
+    , log(&Poco::Logger::get("MaterializeMySQLSyncThread"))
+    , database_name(database_name_)
+    , mysql_database_name(mysql_database_name_)
+    , pool(std::move(pool_))
+    , client(std::move(client_))
+    , settings(settings_)
 {
     query_prefix = "EXTERNAL DDL FROM MySQL(" + backQuoteIfNeed(database_name) + ", " + backQuoteIfNeed(mysql_database_name) + ") ";
 }
@@ -248,7 +257,7 @@ void MaterializeMySQLSyncThread::assertMySQLAvailable()
     }
 }
 
-static inline void cleanOutdatedTables(const String & database_name, const Context & context)
+static inline void cleanOutdatedTables(const String & database_name, ContextPtr context)
 {
     String cleaning_table_name;
     try
@@ -258,7 +267,7 @@ static inline void cleanOutdatedTables(const String & database_name, const Conte
 
         for (auto iterator = clean_database->getTablesIterator(context); iterator->isValid(); iterator->next())
         {
-            Context query_context = createQueryContext(context);
+            auto query_context = createQueryContext(context);
             String comment = "Materialize MySQL step 1: execute MySQL DDL for dump data";
             cleaning_table_name = backQuoteIfNeed(database_name) + "." + backQuoteIfNeed(iterator->name());
             tryToExecuteQuery(" DROP TABLE " + cleaning_table_name, query_context, database_name, comment);
@@ -271,7 +280,8 @@ static inline void cleanOutdatedTables(const String & database_name, const Conte
     }
 }
 
-static inline BlockOutputStreamPtr getTableOutput(const String & database_name, const String & table_name, Context & query_context, bool insert_materialized = false)
+static inline BlockOutputStreamPtr
+getTableOutput(const String & database_name, const String & table_name, ContextPtr query_context, bool insert_materialized = false)
 {
     const StoragePtr & storage = DatabaseCatalog::instance().getTable(StorageID(database_name, table_name), query_context);
 
@@ -303,7 +313,7 @@ static inline BlockOutputStreamPtr getTableOutput(const String & database_name,
 static inline void dumpDataForTables(
     mysqlxx::Pool::Entry & connection, const std::unordered_map<String, String> & need_dumping_tables,
     const String & query_prefix, const String & database_name, const String & mysql_database_name,
-    const Context & context, const std::function<bool()> & is_cancelled)
+    ContextPtr context, const std::function<bool()> & is_cancelled)
 {
     auto iterator = need_dumping_tables.begin();
     for (; iterator != need_dumping_tables.end() && !is_cancelled(); ++iterator)
@@ -311,7 +321,7 @@ static inline void dumpDataForTables(
         try
         {
             const auto & table_name = iterator->first;
-            Context query_context = createQueryContext(context);
+            auto query_context = createQueryContext(context);
             String comment = "Materialize MySQL step 1: execute MySQL DDL for dump data";
             tryToExecuteQuery(query_prefix + " " + iterator->second, query_context, database_name, comment); /// create table.
 
@@ -376,8 +386,12 @@ bool MaterializeMySQLSyncThread::prepareSynchronized(MaterializeMetadata & metad
 
                 metadata.transaction(position, [&]()
                 {
-                    cleanOutdatedTables(database_name, global_context);
-                    dumpDataForTables(connection, need_dumping_tables, query_prefix, database_name, mysql_database_name, global_context, [this] { return isCancelled(); });
+                    cleanOutdatedTables(database_name, getContext());
+                    dumpDataForTables(
+                        connection, need_dumping_tables, query_prefix, database_name, mysql_database_name, getContext(), [this]
+                        {
+                            return isCancelled();
+                        });
                 });
 
                 const auto & position_message = [&]()
@@ -431,7 +445,7 @@ void MaterializeMySQLSyncThread::flushBuffersData(Buffers & buffers, Materialize
     if (buffers.data.empty())
         return;
 
-    metadata.transaction(client.getPosition(), [&]() { buffers.commit(global_context); });
+    metadata.transaction(client.getPosition(), [&]() { buffers.commit(getContext()); });
 
     const auto & position_message = [&]()
     {
@@ -664,21 +678,21 @@ void MaterializeMySQLSyncThread::onEvent(Buffers & buffers, const BinlogEventPtr
     if (receive_event->type() == MYSQL_WRITE_ROWS_EVENT)
     {
         WriteRowsEvent & write_rows_event = static_cast<WriteRowsEvent &>(*receive_event);
-        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(write_rows_event.table, global_context);
+        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(write_rows_event.table, getContext());
         size_t bytes = onWriteOrDeleteData<1>(write_rows_event.rows, buffer->first, ++metadata.data_version);
         buffers.add(buffer->first.rows(), buffer->first.bytes(), write_rows_event.rows.size(), bytes);
     }
     else if (receive_event->type() == MYSQL_UPDATE_ROWS_EVENT)
     {
         UpdateRowsEvent & update_rows_event = static_cast<UpdateRowsEvent &>(*receive_event);
-        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(update_rows_event.table, global_context);
+        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(update_rows_event.table, getContext());
         size_t bytes = onUpdateData(update_rows_event.rows, buffer->first, ++metadata.data_version, buffer->second);
         buffers.add(buffer->first.rows(), buffer->first.bytes(), update_rows_event.rows.size(), bytes);
     }
     else if (receive_event->type() == MYSQL_DELETE_ROWS_EVENT)
     {
         DeleteRowsEvent & delete_rows_event = static_cast<DeleteRowsEvent &>(*receive_event);
-        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(delete_rows_event.table, global_context);
+        Buffers::BufferAndSortingColumnsPtr buffer = buffers.getTableDataBuffer(delete_rows_event.table, getContext());
         size_t bytes = onWriteOrDeleteData<-1>(delete_rows_event.rows, buffer->first, ++metadata.data_version);
         buffers.add(buffer->first.rows(), buffer->first.bytes(), delete_rows_event.rows.size(), bytes);
     }
@@ -687,7 +701,7 @@ void MaterializeMySQLSyncThread::onEvent(Buffers & buffers, const BinlogEventPtr
         QueryEvent & query_event = static_cast<QueryEvent &>(*receive_event);
         Position position_before_ddl;
         position_before_ddl.update(metadata.binlog_position, metadata.binlog_file, metadata.executed_gtid_set);
-        metadata.transaction(position_before_ddl, [&]() { buffers.commit(global_context); });
+        metadata.transaction(position_before_ddl, [&]() { buffers.commit(getContext()); });
         metadata.transaction(client.getPosition(),[&](){ executeDDLAtomic(query_event); });
     }
     else
@@ -718,7 +732,7 @@ void MaterializeMySQLSyncThread::executeDDLAtomic(const QueryEvent & query_event
 {
     try
     {
-        Context query_context = createQueryContext(global_context);
+        auto query_context = createQueryContext(getContext());
         String comment = "Materialize MySQL step 2: execute MySQL DDL for sync data";
         String event_database = query_event.schema == mysql_database_name ? database_name : "";
         tryToExecuteQuery(query_prefix + query_event.query, query_context, event_database, comment);
@@ -761,13 +775,13 @@ bool MaterializeMySQLSyncThread::Buffers::checkThresholds(size_t check_block_row
         || total_blocks_bytes >= check_total_bytes;
 }
 
-void MaterializeMySQLSyncThread::Buffers::commit(const Context & context)
+void MaterializeMySQLSyncThread::Buffers::commit(ContextPtr context)
 {
     try
     {
         for (auto & table_name_and_buffer : data)
         {
-            Context query_context = createQueryContext(context);
+            auto query_context = createQueryContext(context);
             OneBlockInputStream input(table_name_and_buffer.second->first);
             BlockOutputStreamPtr out = getTableOutput(database, table_name_and_buffer.first, query_context, true);
             copyData(input, *out);
@@ -787,7 +801,7 @@ void MaterializeMySQLSyncThread::Buffers::commit(const Context & context)
 }
 
 MaterializeMySQLSyncThread::Buffers::BufferAndSortingColumnsPtr MaterializeMySQLSyncThread::Buffers::getTableDataBuffer(
-    const String & table_name, const Context & context)
+    const String & table_name, ContextPtr context)
 {
     const auto & iterator = data.find(table_name);
     if (iterator == data.end())
diff --git a/src/Databases/MySQL/MaterializeMySQLSyncThread.h b/src/Databases/MySQL/MaterializeMySQLSyncThread.h
index 54a6cbbdda2..03958fe10cc 100644
--- a/src/Databases/MySQL/MaterializeMySQLSyncThread.h
+++ b/src/Databases/MySQL/MaterializeMySQLSyncThread.h
@@ -36,14 +36,18 @@ namespace DB
  *  real-time pull incremental data:
  *      We will pull the binlog event of MySQL to parse and execute when the full data synchronization is completed.
  */
-class MaterializeMySQLSyncThread
+class MaterializeMySQLSyncThread : WithContext
 {
 public:
     ~MaterializeMySQLSyncThread();
 
     MaterializeMySQLSyncThread(
-        const Context & context, const String & database_name_, const String & mysql_database_name_
-        , mysqlxx::Pool && pool_, MySQLClient && client_, MaterializeMySQLSettings * settings_);
+        ContextPtr context,
+        const String & database_name_,
+        const String & mysql_database_name_,
+        mysqlxx::Pool && pool_,
+        MySQLClient && client_,
+        MaterializeMySQLSettings * settings_);
 
     void stopSynchronization();
 
@@ -55,7 +59,6 @@ public:
 
 private:
     Poco::Logger * log;
-    const Context & global_context;
 
     String database_name;
     String mysql_database_name;
@@ -90,13 +93,13 @@ private:
 
         Buffers(const String & database_) : database(database_) {}
 
-        void commit(const Context & context);
+        void commit(ContextPtr context);
 
         void add(size_t block_rows, size_t block_bytes, size_t written_rows, size_t written_bytes);
 
         bool checkThresholds(size_t check_block_rows, size_t check_block_bytes, size_t check_total_rows, size_t check_total_bytes) const;
 
-        BufferAndSortingColumnsPtr getTableDataBuffer(const String & table, const Context & context);
+        BufferAndSortingColumnsPtr getTableDataBuffer(const String & table, ContextPtr context);
     };
 
     void synchronization();
diff --git a/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp b/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp
index 1134912aeac..e12d7f975ce 100644
--- a/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp
+++ b/src/Databases/PostgreSQL/DatabasePostgreSQL.cpp
@@ -35,7 +35,7 @@ static const auto suffix = ".removed";
 static const auto cleaner_reschedule_ms = 60000;
 
 DatabasePostgreSQL::DatabasePostgreSQL(
-        const Context & context,
+        ContextPtr context_,
         const String & metadata_path_,
         const ASTStorage * database_engine_define_,
         const String & dbname_,
@@ -43,14 +43,14 @@ DatabasePostgreSQL::DatabasePostgreSQL(
         postgres::PoolWithFailoverPtr connection_pool_,
         const bool cache_tables_)
     : IDatabase(dbname_)
-    , global_context(context.getGlobalContext())
+    , WithContext(context_->getGlobalContext())
     , metadata_path(metadata_path_)
     , database_engine_define(database_engine_define_->clone())
     , dbname(postgres_dbname)
     , connection_pool(std::move(connection_pool_))
     , cache_tables(cache_tables_)
 {
-    cleaner_task = context.getSchedulePool().createTask("PostgreSQLCleanerTask", [this]{ removeOutdatedTables(); });
+    cleaner_task = getContext()->getSchedulePool().createTask("PostgreSQLCleanerTask", [this]{ removeOutdatedTables(); });
     cleaner_task->deactivate();
 }
 
@@ -69,8 +69,7 @@ bool DatabasePostgreSQL::empty() const
 }
 
 
-DatabaseTablesIteratorPtr DatabasePostgreSQL::getTablesIterator(
-        const Context & context, const FilterByNameFunction & /* filter_by_table_name */)
+DatabaseTablesIteratorPtr DatabasePostgreSQL::getTablesIterator(ContextPtr local_context, const FilterByNameFunction & /* filter_by_table_name */)
 {
     std::lock_guard<std::mutex> lock(mutex);
 
@@ -79,7 +78,7 @@ DatabaseTablesIteratorPtr DatabasePostgreSQL::getTablesIterator(
 
     for (const auto & table_name : table_names)
         if (!detached_or_dropped.count(table_name))
-            tables[table_name] = fetchTable(table_name, context, true);
+            tables[table_name] = fetchTable(table_name, local_context, true);
 
     return std::make_unique<DatabaseTablesSnapshotIterator>(tables, database_name);
 }
@@ -135,7 +134,7 @@ bool DatabasePostgreSQL::checkPostgresTable(const String & table_name) const
 }
 
 
-bool DatabasePostgreSQL::isTableExist(const String & table_name, const Context & /* context */) const
+bool DatabasePostgreSQL::isTableExist(const String & table_name, ContextPtr /* context */) const
 {
     std::lock_guard<std::mutex> lock(mutex);
 
@@ -146,25 +145,25 @@ bool DatabasePostgreSQL::isTableExist(const String & table_name, const Context &
 }
 
 
-StoragePtr DatabasePostgreSQL::tryGetTable(const String & table_name, const Context & context) const
+StoragePtr DatabasePostgreSQL::tryGetTable(const String & table_name, ContextPtr local_context) const
 {
     std::lock_guard<std::mutex> lock(mutex);
 
     if (!detached_or_dropped.count(table_name))
-        return fetchTable(table_name, context, false);
+        return fetchTable(table_name, local_context, false);
 
     return StoragePtr{};
 }
 
 
-StoragePtr DatabasePostgreSQL::fetchTable(const String & table_name, const Context & context, const bool table_checked) const
+StoragePtr DatabasePostgreSQL::fetchTable(const String & table_name, ContextPtr local_context, const bool table_checked) const
 {
     if (!cache_tables || !cached_tables.count(table_name))
     {
         if (!table_checked && !checkPostgresTable(table_name))
             return StoragePtr{};
 
-        auto use_nulls = context.getSettingsRef().external_table_functions_use_nulls;
+        auto use_nulls = local_context->getSettingsRef().external_table_functions_use_nulls;
         auto columns = fetchPostgreSQLTableStructure(connection_pool->get(), doubleQuoteString(table_name), use_nulls);
 
         if (!columns)
@@ -172,7 +171,7 @@ StoragePtr DatabasePostgreSQL::fetchTable(const String & table_name, const Conte
 
         auto storage = StoragePostgreSQL::create(
                 StorageID(database_name, table_name), *connection_pool, table_name,
-                ColumnsDescription{*columns}, ConstraintsDescription{}, context);
+                ColumnsDescription{*columns}, ConstraintsDescription{}, local_context);
 
         if (cache_tables)
             cached_tables[table_name] = storage;
@@ -232,7 +231,7 @@ StoragePtr DatabasePostgreSQL::detachTable(const String & table_name)
 }
 
 
-void DatabasePostgreSQL::createTable(const Context &, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query)
+void DatabasePostgreSQL::createTable(ContextPtr, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query)
 {
     const auto & create = create_query->as<ASTCreateQuery>();
 
@@ -243,7 +242,7 @@ void DatabasePostgreSQL::createTable(const Context &, const String & table_name,
 }
 
 
-void DatabasePostgreSQL::dropTable(const Context &, const String & table_name, bool /* no_delay */)
+void DatabasePostgreSQL::dropTable(ContextPtr, const String & table_name, bool /* no_delay */)
 {
     std::lock_guard<std::mutex> lock{mutex};
 
@@ -271,13 +270,13 @@ void DatabasePostgreSQL::dropTable(const Context &, const String & table_name, b
 }
 
 
-void DatabasePostgreSQL::drop(const Context & /*context*/)
+void DatabasePostgreSQL::drop(ContextPtr /*context*/)
 {
     Poco::File(getMetadataPath()).remove(true);
 }
 
 
-void DatabasePostgreSQL::loadStoredObjects(Context & /* context */, bool, bool /*force_attach*/)
+void DatabasePostgreSQL::loadStoredObjects(ContextPtr /* context */, bool, bool /*force_attach*/)
 {
     {
         std::lock_guard<std::mutex> lock{mutex};
@@ -349,9 +348,9 @@ ASTPtr DatabasePostgreSQL::getCreateDatabaseQuery() const
 }
 
 
-ASTPtr DatabasePostgreSQL::getCreateTableQueryImpl(const String & table_name, const Context & context, bool throw_on_error) const
+ASTPtr DatabasePostgreSQL::getCreateTableQueryImpl(const String & table_name, ContextPtr local_context, bool throw_on_error) const
 {
-    auto storage = fetchTable(table_name, context, false);
+    auto storage = fetchTable(table_name, local_context, false);
     if (!storage)
     {
         if (throw_on_error)
diff --git a/src/Databases/PostgreSQL/DatabasePostgreSQL.h b/src/Databases/PostgreSQL/DatabasePostgreSQL.h
index 6cb978d7cf1..3505c38e499 100644
--- a/src/Databases/PostgreSQL/DatabasePostgreSQL.h
+++ b/src/Databases/PostgreSQL/DatabasePostgreSQL.h
@@ -23,18 +23,18 @@ class Context;
  *  If `cache_tables` == 1 (default: 0) table structure is cached and not checked for being modififed,
  *  but it will be updated during detach->attach.
  */
-class DatabasePostgreSQL final : public IDatabase
+class DatabasePostgreSQL final : public IDatabase, WithContext
 {
 
 public:
     DatabasePostgreSQL(
-        const Context & context,
+        ContextPtr context,
         const String & metadata_path_,
         const ASTStorage * database_engine_define,
         const String & dbname_,
         const String & postgres_dbname,
         postgres::PoolWithFailoverPtr connection_pool_,
-        const bool cache_tables_);
+        bool cache_tables_);
 
     String getEngineName() const override { return "PostgreSQL"; }
     String getMetadataPath() const override { return metadata_path; }
@@ -47,27 +47,26 @@ public:
 
     bool empty() const override;
 
-    void loadStoredObjects(Context &, bool, bool force_attach) override;
+    void loadStoredObjects(ContextPtr, bool, bool force_attach) override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name) override;
+    DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) override;
 
-    bool isTableExist(const String & name, const Context & context) const override;
-    StoragePtr tryGetTable(const String & name, const Context & context) const override;
+    bool isTableExist(const String & name, ContextPtr context) const override;
+    StoragePtr tryGetTable(const String & name, ContextPtr context) const override;
 
-    void createTable(const Context &, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
-    void dropTable(const Context &, const String & table_name, bool no_delay) override;
+    void createTable(ContextPtr, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
+    void dropTable(ContextPtr, const String & table_name, bool no_delay) override;
 
     void attachTable(const String & table_name, const StoragePtr & storage, const String & relative_table_path) override;
     StoragePtr detachTable(const String & table_name) override;
 
-    void drop(const Context & /*context*/) override;
+    void drop(ContextPtr /*context*/) override;
     void shutdown() override;
 
 protected:
-    ASTPtr getCreateTableQueryImpl(const String & table_name, const Context & context, bool throw_on_error) const override;
+    ASTPtr getCreateTableQueryImpl(const String & table_name, ContextPtr context, bool throw_on_error) const override;
 
 private:
-    const Context & global_context;
     String metadata_path;
     ASTPtr database_engine_define;
     String dbname;
@@ -80,7 +79,7 @@ private:
 
     bool checkPostgresTable(const String & table_name) const;
     std::unordered_set<std::string> fetchTablesList() const;
-    StoragePtr fetchTable(const String & table_name, const Context & context, const bool table_checked) const;
+    StoragePtr fetchTable(const String & table_name, ContextPtr context, bool table_checked) const;
     void removeOutdatedTables();
     ASTPtr getColumnDeclaration(const DataTypePtr & data_type) const;
 };
diff --git a/src/Dictionaries/CassandraDictionarySource.cpp b/src/Dictionaries/CassandraDictionarySource.cpp
index 643e9af54b8..95ceef0e0f2 100644
--- a/src/Dictionaries/CassandraDictionarySource.cpp
+++ b/src/Dictionaries/CassandraDictionarySource.cpp
@@ -17,7 +17,7 @@ void registerDictionarySourceCassandra(DictionarySourceFactory & factory)
                                    [[maybe_unused]] const Poco::Util::AbstractConfiguration & config,
                                    [[maybe_unused]] const std::string & config_prefix,
                                    [[maybe_unused]] Block & sample_block,
-                                                    const Context & /* context */,
+                                                    ContextPtr /* context */,
                                                     const std::string & /* default_database */,
                                                     bool /*check_config*/) -> DictionarySourcePtr
     {
diff --git a/src/Dictionaries/ClickHouseDictionarySource.cpp b/src/Dictionaries/ClickHouseDictionarySource.cpp
index d89271932eb..fdb0d76a8d7 100644
--- a/src/Dictionaries/ClickHouseDictionarySource.cpp
+++ b/src/Dictionaries/ClickHouseDictionarySource.cpp
@@ -27,9 +27,9 @@ namespace
 {
     constexpr size_t MAX_CONNECTIONS = 16;
 
-    inline UInt16 getPortFromContext(const Context & context, bool secure)
+    inline UInt16 getPortFromContext(ContextPtr context, bool secure)
     {
-        return secure ? context.getTCPPortSecure().value_or(0) : context.getTCPPort();
+        return secure ? context->getTCPPortSecure().value_or(0) : context->getTCPPort();
     }
 
     ConnectionPoolWithFailoverPtr createPool(const ClickHouseDictionarySource::Configuration & configuration)
@@ -60,19 +60,19 @@ ClickHouseDictionarySource::ClickHouseDictionarySource(
     const DictionaryStructure & dict_struct_,
     const Configuration & configuration_,
     const Block & sample_block_,
-    const Context & context_)
+    ContextPtr context_)
     : update_time{std::chrono::system_clock::from_time_t(0)}
     , dict_struct{dict_struct_}
     , configuration{configuration_}
     , query_builder{dict_struct, configuration.db, "", configuration.table, configuration.where, IdentifierQuotingStyle::Backticks}
     , sample_block{sample_block_}
-    , context{context_}
+    , context(Context::createCopy(context_))
     , pool{createPool(configuration)}
     , load_all_query{query_builder.composeLoadAllQuery()}
 {
     /// Query context is needed because some code in executeQuery function may assume it exists.
     /// Current example is Context::getSampleBlockCache from InterpreterSelectWithUnionQuery::getSampleBlock.
-    context.makeQueryContext();
+    context->makeQueryContext();
 }
 
 ClickHouseDictionarySource::ClickHouseDictionarySource(const ClickHouseDictionarySource & other)
@@ -82,11 +82,11 @@ ClickHouseDictionarySource::ClickHouseDictionarySource(const ClickHouseDictionar
     , invalidate_query_response{other.invalidate_query_response}
     , query_builder{dict_struct, configuration.db, "", configuration.table, configuration.where, IdentifierQuotingStyle::Backticks}
     , sample_block{other.sample_block}
-    , context{other.context}
+    , context(Context::createCopy(other.context))
     , pool{createPool(configuration)}
     , load_all_query{other.load_all_query}
 {
-    context.makeQueryContext();
+    context->makeQueryContext();
 }
 
 std::string ClickHouseDictionarySource::getUpdateFieldAndDate()
@@ -172,7 +172,7 @@ std::string ClickHouseDictionarySource::doInvalidateQuery(const std::string & re
     LOG_TRACE(log, "Performing invalidate query");
     if (configuration.is_local)
     {
-        Context query_context = context;
+        auto query_context = Context::createCopy(context);
         auto input_block = executeQuery(request, query_context, true).getInputStream();
         return readInvalidateQuery(*input_block);
     }
@@ -191,12 +191,12 @@ void registerDictionarySourceClickHouse(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & default_database [[maybe_unused]],
                                  bool /* check_config */) -> DictionarySourcePtr
     {
         bool secure = config.getBool(config_prefix + ".secure", false);
-        Context context_copy = context;
+        auto context_copy = Context::createCopy(context);
 
         UInt16 default_port = getPortFromContext(context_copy, secure);
 
@@ -221,7 +221,7 @@ void registerDictionarySourceClickHouse(DictionarySourceFactory & factory)
         /// We should set user info even for the case when the dictionary is loaded in-process (without TCP communication).
         if (configuration.is_local)
         {
-            context_copy.setUser(configuration.user, configuration.password, Poco::Net::SocketAddress("127.0.0.1", 0));
+            context_copy->setUser(configuration.user, configuration.password, Poco::Net::SocketAddress("127.0.0.1", 0));
             context_copy = copyContextAndApplySettings(config_prefix, context_copy, config);
         }
 
diff --git a/src/Dictionaries/ClickHouseDictionarySource.h b/src/Dictionaries/ClickHouseDictionarySource.h
index ac615848b49..21c290ab23b 100644
--- a/src/Dictionaries/ClickHouseDictionarySource.h
+++ b/src/Dictionaries/ClickHouseDictionarySource.h
@@ -37,7 +37,7 @@ public:
         const DictionaryStructure & dict_struct_,
         const Configuration & configuration_,
         const Block & sample_block_,
-        const Context & context);
+        ContextPtr context);
 
     /// copy-constructor is provided in order to support cloneability
     ClickHouseDictionarySource(const ClickHouseDictionarySource & other);
@@ -77,7 +77,7 @@ private:
     mutable std::string invalidate_query_response;
     ExternalQueryBuilder query_builder;
     Block sample_block;
-    Context context;
+    ContextPtr context;
     ConnectionPoolWithFailoverPtr pool;
     const std::string load_all_query;
     Poco::Logger * log = &Poco::Logger::get("ClickHouseDictionarySource");
diff --git a/src/Dictionaries/DictionaryFactory.cpp b/src/Dictionaries/DictionaryFactory.cpp
index 0ab7d199186..ecd10ed8f07 100644
--- a/src/Dictionaries/DictionaryFactory.cpp
+++ b/src/Dictionaries/DictionaryFactory.cpp
@@ -31,7 +31,7 @@ DictionaryPtr DictionaryFactory::create(
     const std::string & name,
     const Poco::Util::AbstractConfiguration & config,
     const std::string & config_prefix,
-    const Context & context,
+    ContextPtr context,
     bool check_source_config) const
 {
     Poco::Util::AbstractConfiguration::Keys keys;
@@ -47,8 +47,8 @@ DictionaryPtr DictionaryFactory::create(
         name, config, config_prefix + ".source", dict_struct, context, config.getString(config_prefix + ".database", ""), check_source_config);
     LOG_TRACE(&Poco::Logger::get("DictionaryFactory"), "Created dictionary source '{}' for dictionary '{}'", source_ptr->toString(), name);
 
-    if (context.hasQueryContext() && context.getSettingsRef().log_queries)
-        context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Dictionary, name);
+    if (context->hasQueryContext() && context->getSettingsRef().log_queries)
+        context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Dictionary, name);
 
     const auto & layout_type = keys.front();
 
@@ -64,7 +64,7 @@ DictionaryPtr DictionaryFactory::create(
     throw Exception{name + ": unknown dictionary layout type: " + layout_type, ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG};
 }
 
-DictionaryPtr DictionaryFactory::create(const std::string & name, const ASTCreateQuery & ast, const Context & context) const
+DictionaryPtr DictionaryFactory::create(const std::string & name, const ASTCreateQuery & ast, ContextPtr context) const
 {
     auto configuration = getDictionaryConfigurationFromAST(ast, context);
     return DictionaryFactory::create(name, *configuration, "dictionary", context, true);
diff --git a/src/Dictionaries/DictionaryFactory.h b/src/Dictionaries/DictionaryFactory.h
index 3d3f793e2b2..b869550a9af 100644
--- a/src/Dictionaries/DictionaryFactory.h
+++ b/src/Dictionaries/DictionaryFactory.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
 #include "IDictionary.h"
 #include "registerDictionaries.h"
 #include <Parsers/ASTCreateQuery.h>
@@ -21,8 +22,6 @@ class Logger;
 namespace DB
 {
 
-class Context;
-
 /** Create dictionary according to its layout.
   */
 class DictionaryFactory : private boost::noncopyable
@@ -37,13 +36,13 @@ public:
         const std::string & name,
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix,
-        const Context & context,
+        ContextPtr context,
         bool check_source_config = false) const;
 
     /// Create dictionary from DDL-query
     DictionaryPtr create(const std::string & name,
         const ASTCreateQuery & ast,
-        const Context & context) const;
+        ContextPtr context) const;
 
     using Creator = std::function<DictionaryPtr(
         const std::string & name,
diff --git a/src/Dictionaries/DictionarySourceFactory.cpp b/src/Dictionaries/DictionarySourceFactory.cpp
index af3552364ba..d9f7800960c 100644
--- a/src/Dictionaries/DictionarySourceFactory.cpp
+++ b/src/Dictionaries/DictionarySourceFactory.cpp
@@ -79,7 +79,7 @@ DictionarySourcePtr DictionarySourceFactory::create(
     const Poco::Util::AbstractConfiguration & config,
     const std::string & config_prefix,
     const DictionaryStructure & dict_struct,
-    const Context & context,
+    ContextPtr context,
     const std::string & default_database,
     bool check_config) const
 {
diff --git a/src/Dictionaries/DictionarySourceFactory.h b/src/Dictionaries/DictionarySourceFactory.h
index 1406660dfb4..bb583927ac4 100644
--- a/src/Dictionaries/DictionarySourceFactory.h
+++ b/src/Dictionaries/DictionarySourceFactory.h
@@ -2,6 +2,7 @@
 
 #include "IDictionarySource.h"
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 
 #include <unordered_map>
 
@@ -17,7 +18,7 @@ class Logger;
 
 namespace DB
 {
-class Context;
+
 struct DictionaryStructure;
 
 /// creates IDictionarySource instance from config and DictionaryStructure
@@ -34,7 +35,7 @@ public:
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix,
         Block & sample_block,
-        const Context & context,
+        ContextPtr context,
         const std::string & default_database,
         bool check_config)>;
 
@@ -47,7 +48,7 @@ public:
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix,
         const DictionaryStructure & dict_struct,
-        const Context & context,
+        ContextPtr context,
         const std::string & default_database,
         bool check_config) const;
 
diff --git a/src/Dictionaries/DictionarySourceHelpers.cpp b/src/Dictionaries/DictionarySourceHelpers.cpp
index 64527a78e8e..85a61644d2f 100644
--- a/src/Dictionaries/DictionarySourceHelpers.cpp
+++ b/src/Dictionaries/DictionarySourceHelpers.cpp
@@ -67,12 +67,12 @@ Block blockForKeys(
     return block;
 }
 
-Context copyContextAndApplySettings(
+ContextPtr copyContextAndApplySettings(
     const std::string & config_prefix,
-    const Context & context,
+    ContextPtr context,
     const Poco::Util::AbstractConfiguration & config)
 {
-    Context local_context(context);
+    auto local_context = Context::createCopy(context);
     if (config.has(config_prefix + ".settings"))
     {
         const auto prefix = config_prefix + ".settings";
@@ -88,7 +88,7 @@ Context copyContextAndApplySettings(
             changes.emplace_back(key, value);
         }
 
-        local_context.applySettingsChanges(changes);
+        local_context->applySettingsChanges(changes);
     }
     return local_context;
 }
diff --git a/src/Dictionaries/DictionarySourceHelpers.h b/src/Dictionaries/DictionarySourceHelpers.h
index b429136a981..1febf921e07 100644
--- a/src/Dictionaries/DictionarySourceHelpers.h
+++ b/src/Dictionaries/DictionarySourceHelpers.h
@@ -9,6 +9,7 @@
 #include <DataStreams/IBlockInputStream.h>
 #include <Columns/IColumn.h>
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
@@ -17,7 +18,6 @@ class IBlockOutputStream;
 using BlockOutputStreamPtr = std::shared_ptr<IBlockOutputStream>;
 
 struct DictionaryStructure;
-class Context;
 
 /// Write keys to block output stream.
 
@@ -37,14 +37,14 @@ Block blockForKeys(
     const std::vector<size_t> & requested_rows);
 
 /// Used for applying settings to copied context in some register[...]Source functions
-Context copyContextAndApplySettings(
+ContextPtr copyContextAndApplySettings(
     const std::string & config_prefix,
-    const Context & context,
+    ContextPtr context,
     const Poco::Util::AbstractConfiguration & config);
 
 void applySettingsToContext(
     const std::string & config_prefix,
-    Context & context,
+    ContextPtr context,
     const Poco::Util::AbstractConfiguration & config);
 
 /** A stream, adds additional columns to each block that it will read from inner stream.
diff --git a/src/Dictionaries/ExecutableDictionarySource.cpp b/src/Dictionaries/ExecutableDictionarySource.cpp
index 8066de41b20..e08106195a9 100644
--- a/src/Dictionaries/ExecutableDictionarySource.cpp
+++ b/src/Dictionaries/ExecutableDictionarySource.cpp
@@ -62,7 +62,7 @@ ExecutableDictionarySource::ExecutableDictionarySource(
     const Poco::Util::AbstractConfiguration & config,
     const std::string & config_prefix,
     Block & sample_block_,
-    const Context & context_)
+    ContextPtr context_)
     : log(&Poco::Logger::get("ExecutableDictionarySource"))
     , dict_struct{dict_struct_}
     , implicit_key{config.getBool(config_prefix + ".implicit_key", false)}
@@ -97,7 +97,7 @@ ExecutableDictionarySource::ExecutableDictionarySource(const ExecutableDictionar
     , update_field{other.update_field}
     , format{other.format}
     , sample_block{other.sample_block}
-    , context(other.context)
+    , context(Context::createCopy(other.context))
 {
 }
 
@@ -108,7 +108,7 @@ BlockInputStreamPtr ExecutableDictionarySource::loadAll()
 
     LOG_TRACE(log, "loadAll {}", toString());
     auto process = ShellCommand::execute(command);
-    auto input_stream = context.getInputFormat(format, process->out, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, process->out, sample_block, max_block_size);
     return std::make_shared<ShellCommandOwningBlockInputStream>(log, input_stream, std::move(process));
 }
 
@@ -126,7 +126,7 @@ BlockInputStreamPtr ExecutableDictionarySource::loadUpdatedAll()
 
     LOG_TRACE(log, "loadUpdatedAll {}", command_with_update_field);
     auto process = ShellCommand::execute(command_with_update_field);
-    auto input_stream = context.getInputFormat(format, process->out, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, process->out, sample_block, max_block_size);
     return std::make_shared<ShellCommandOwningBlockInputStream>(log, input_stream, std::move(process));
 }
 
@@ -139,7 +139,7 @@ namespace
     {
     public:
         BlockInputStreamWithBackgroundThread(
-            const Context & context,
+            ContextPtr context,
             const std::string & format,
             const Block & sample_block,
             const std::string & command_str,
@@ -150,7 +150,7 @@ namespace
             send_data(std::move(send_data_)),
             thread([this] { send_data(command->in); })
         {
-            stream = context.getInputFormat(format, command->out, sample_block, max_block_size);
+            stream = context->getInputFormat(format, command->out, sample_block, max_block_size);
         }
 
         ~BlockInputStreamWithBackgroundThread() override
@@ -222,7 +222,7 @@ BlockInputStreamPtr ExecutableDictionarySource::getStreamForBlock(const Block &
         context, format, sample_block, command, log,
         [block, this](WriteBufferFromFile & out) mutable
         {
-            auto output_stream = context.getOutputStream(format, out, block.cloneEmpty());
+            auto output_stream = context->getOutputStream(format, out, block.cloneEmpty());
             formatBlock(output_stream, block);
             out.close();
         });
@@ -264,7 +264,7 @@ void registerDictionarySourceExecutable(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & /* default_database */,
                                  bool check_config) -> DictionarySourcePtr
     {
@@ -277,7 +277,7 @@ void registerDictionarySourceExecutable(DictionarySourceFactory & factory)
         if (check_config)
             throw Exception(ErrorCodes::DICTIONARY_ACCESS_DENIED, "Dictionaries with executable dictionary source are not allowed to be created from DDL query");
 
-        Context context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
+        auto context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
 
         return std::make_unique<ExecutableDictionarySource>(
             dict_struct, config, config_prefix + ".executable",
diff --git a/src/Dictionaries/ExecutableDictionarySource.h b/src/Dictionaries/ExecutableDictionarySource.h
index 9dc152bf580..878cb086873 100644
--- a/src/Dictionaries/ExecutableDictionarySource.h
+++ b/src/Dictionaries/ExecutableDictionarySource.h
@@ -20,7 +20,7 @@ public:
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix,
         Block & sample_block_,
-        const Context & context_);
+        ContextPtr context_);
 
     ExecutableDictionarySource(const ExecutableDictionarySource & other);
     ExecutableDictionarySource & operator=(const ExecutableDictionarySource &) = delete;
@@ -58,7 +58,7 @@ private:
     const std::string update_field;
     const std::string format;
     Block sample_block;
-    Context context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Dictionaries/ExecutablePoolDictionarySource.cpp b/src/Dictionaries/ExecutablePoolDictionarySource.cpp
index 0c9ca4ce714..4190bfdec42 100644
--- a/src/Dictionaries/ExecutablePoolDictionarySource.cpp
+++ b/src/Dictionaries/ExecutablePoolDictionarySource.cpp
@@ -32,7 +32,7 @@ ExecutablePoolDictionarySource::ExecutablePoolDictionarySource(
     const DictionaryStructure & dict_struct_,
     const Configuration & configuration_,
     Block & sample_block_,
-    const Context & context_)
+    ContextPtr context_)
     : log(&Poco::Logger::get("ExecutablePoolDictionarySource"))
     , dict_struct{dict_struct_}
     , configuration{configuration_}
@@ -63,7 +63,7 @@ ExecutablePoolDictionarySource::ExecutablePoolDictionarySource(const ExecutableP
     , dict_struct{other.dict_struct}
     , configuration{other.configuration}
     , sample_block{other.sample_block}
-    , context{other.context}
+    , context{Context::createCopy(other.context)}
     , process_pool{std::make_shared<ProcessPool>(configuration.pool_size)}
 {
 }
@@ -226,13 +226,13 @@ BlockInputStreamPtr ExecutablePoolDictionarySource::getStreamForBlock(const Bloc
             configuration.max_command_execution_time);
 
     size_t rows_to_read = block.rows();
-    auto read_stream = context.getInputFormat(configuration.format, process->out, sample_block, rows_to_read);
+    auto read_stream = context->getInputFormat(configuration.format, process->out, sample_block, rows_to_read);
 
     auto stream = std::make_unique<PoolBlockInputStreamWithBackgroundThread>(
         process_pool, std::move(process), std::move(read_stream), rows_to_read, log,
         [block, this](WriteBufferFromFile & out) mutable
         {
-            auto output_stream = context.getOutputStream(configuration.format, out, block.cloneEmpty());
+            auto output_stream = context->getOutputStream(configuration.format, out, block.cloneEmpty());
             formatBlock(output_stream, block);
         });
 
@@ -273,7 +273,7 @@ void registerDictionarySourceExecutablePool(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & /* default_database */,
                                  bool check_config) -> DictionarySourcePtr
     {
@@ -286,20 +286,20 @@ void registerDictionarySourceExecutablePool(DictionarySourceFactory & factory)
         if (check_config)
             throw Exception(ErrorCodes::DICTIONARY_ACCESS_DENIED, "Dictionaries with executable pool dictionary source are not allowed to be created from DDL query");
 
-        Context context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
+        auto context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
 
         /** Currently parallel parsing input format cannot read exactly max_block_size rows from input,
          *  so it will be blocked on ReadBufferFromFileDescriptor because this file descriptor represent pipe that does not have eof.
          */
-        auto settings_no_parallel_parsing = context_local_copy.getSettings();
+        auto settings_no_parallel_parsing = context_local_copy->getSettings();
         settings_no_parallel_parsing.input_format_parallel_parsing = false;
-        context_local_copy.setSettings(settings_no_parallel_parsing);
+        context_local_copy->setSettings(settings_no_parallel_parsing);
 
         String configuration_config_prefix = config_prefix + ".executable_pool";
 
         size_t max_command_execution_time = config.getUInt64(configuration_config_prefix + ".max_command_execution_time", 10);
 
-        size_t max_execution_time_seconds = static_cast<size_t>(context.getSettings().max_execution_time.totalSeconds());
+        size_t max_execution_time_seconds = static_cast<size_t>(context->getSettings().max_execution_time.totalSeconds());
         if (max_execution_time_seconds != 0 && max_command_execution_time > max_execution_time_seconds)
             max_command_execution_time = max_execution_time_seconds;
 
diff --git a/src/Dictionaries/ExecutablePoolDictionarySource.h b/src/Dictionaries/ExecutablePoolDictionarySource.h
index da75881b799..7f24e56257a 100644
--- a/src/Dictionaries/ExecutablePoolDictionarySource.h
+++ b/src/Dictionaries/ExecutablePoolDictionarySource.h
@@ -41,7 +41,7 @@ public:
         const DictionaryStructure & dict_struct_,
         const Configuration & configuration_,
         Block & sample_block_,
-        const Context & context_);
+        ContextPtr context_);
 
     ExecutablePoolDictionarySource(const ExecutablePoolDictionarySource & other);
     ExecutablePoolDictionarySource & operator=(const ExecutablePoolDictionarySource &) = delete;
@@ -77,7 +77,7 @@ private:
     const Configuration configuration;
 
     Block sample_block;
-    Context context;
+    ContextPtr context;
     std::shared_ptr<ProcessPool> process_pool;
 };
 
diff --git a/src/Dictionaries/FileDictionarySource.cpp b/src/Dictionaries/FileDictionarySource.cpp
index 0fe632802e7..f90b9c4e133 100644
--- a/src/Dictionaries/FileDictionarySource.cpp
+++ b/src/Dictionaries/FileDictionarySource.cpp
@@ -26,7 +26,7 @@ namespace ErrorCodes
 
 FileDictionarySource::FileDictionarySource(
     const std::string & filepath_, const std::string & format_,
-    Block & sample_block_, const Context & context_, bool check_config)
+    Block & sample_block_, ContextPtr context_, bool check_config)
     : filepath{filepath_}
     , format{format_}
     , sample_block{sample_block_}
@@ -37,7 +37,7 @@ FileDictionarySource::FileDictionarySource(
         auto source_file_path = std::filesystem::path(filepath);
         auto source_file_absolute_path = std::filesystem::canonical(source_file_path);
 
-        String user_files_path_string_value = context.getUserFilesPath();
+        String user_files_path_string_value = context->getUserFilesPath();
         auto user_files_path = std::filesystem::path(user_files_path_string_value);
         auto user_files_absolute_path = std::filesystem::canonical(user_files_path);
 
@@ -55,7 +55,7 @@ FileDictionarySource::FileDictionarySource(const FileDictionarySource & other)
     : filepath{other.filepath}
     , format{other.format}
     , sample_block{other.sample_block}
-    , context(other.context)
+    , context(Context::createCopy(other.context))
     , last_modification{other.last_modification}
 {
 }
@@ -65,7 +65,7 @@ BlockInputStreamPtr FileDictionarySource::loadAll()
 {
     LOG_TRACE(&Poco::Logger::get("FileDictionary"), "loadAll {}", toString());
     auto in_ptr = std::make_unique<ReadBufferFromFile>(filepath);
-    auto stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
+    auto stream = context->getInputFormat(format, *in_ptr, sample_block, max_block_size);
     last_modification = getLastModification();
 
     return std::make_shared<OwningBlockInputStream<ReadBuffer>>(stream, std::move(in_ptr));
@@ -89,7 +89,7 @@ void registerDictionarySourceFile(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & /* default_database */,
                                  bool check_config) -> DictionarySourcePtr
     {
@@ -99,7 +99,7 @@ void registerDictionarySourceFile(DictionarySourceFactory & factory)
         const auto filepath = config.getString(config_prefix + ".file.path");
         const auto format = config.getString(config_prefix + ".file.format");
 
-        Context context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
+        auto context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
 
         return std::make_unique<FileDictionarySource>(filepath, format, sample_block, context_local_copy, check_config);
     };
diff --git a/src/Dictionaries/FileDictionarySource.h b/src/Dictionaries/FileDictionarySource.h
index fa47b280911..0e371cbd658 100644
--- a/src/Dictionaries/FileDictionarySource.h
+++ b/src/Dictionaries/FileDictionarySource.h
@@ -17,7 +17,7 @@ class FileDictionarySource final : public IDictionarySource
 {
 public:
     FileDictionarySource(const std::string & filepath_, const std::string & format_,
-        Block & sample_block_, const Context & context_, bool check_config);
+        Block & sample_block_, ContextPtr context_, bool check_config);
 
     FileDictionarySource(const FileDictionarySource & other);
 
@@ -61,7 +61,7 @@ private:
     const std::string filepath;
     const std::string format;
     Block sample_block;
-    const Context context;
+    ContextPtr context;
     Poco::Timestamp last_modification;
 };
 
diff --git a/src/Dictionaries/HTTPDictionarySource.cpp b/src/Dictionaries/HTTPDictionarySource.cpp
index 62bf478afc4..4f2a1d8eca4 100644
--- a/src/Dictionaries/HTTPDictionarySource.cpp
+++ b/src/Dictionaries/HTTPDictionarySource.cpp
@@ -30,7 +30,7 @@ HTTPDictionarySource::HTTPDictionarySource(
     const Poco::Util::AbstractConfiguration & config,
     const std::string & config_prefix,
     Block & sample_block_,
-    const Context & context_,
+    ContextPtr context_,
     bool check_config)
     : log(&Poco::Logger::get("HTTPDictionarySource"))
     , update_time{std::chrono::system_clock::from_time_t(0)}
@@ -44,7 +44,7 @@ HTTPDictionarySource::HTTPDictionarySource(
 {
 
     if (check_config)
-        context.getRemoteHostFilter().checkURL(Poco::URI(url));
+        context->getRemoteHostFilter().checkURL(Poco::URI(url));
 
     const auto & credentials_prefix = config_prefix + ".credentials";
 
@@ -80,7 +80,7 @@ HTTPDictionarySource::HTTPDictionarySource(const HTTPDictionarySource & other)
     , update_field{other.update_field}
     , format{other.format}
     , sample_block{other.sample_block}
-    , context(other.context)
+    , context(Context::createCopy(other.context))
     , timeouts(ConnectionTimeouts::getHTTPTimeouts(context))
 {
     credentials.setUsername(other.credentials.getUsername());
@@ -111,7 +111,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadAll()
     auto in_ptr = std::make_unique<ReadWriteBufferFromHTTP>(
         uri, Poco::Net::HTTPRequest::HTTP_GET, ReadWriteBufferFromHTTP::OutStreamCallback(), timeouts,
         0, credentials, DBMS_DEFAULT_BUFFER_SIZE, header_entries);
-    auto input_stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, *in_ptr, sample_block, max_block_size);
     return std::make_shared<OwningBlockInputStream<ReadWriteBufferFromHTTP>>(input_stream, std::move(in_ptr));
 }
 
@@ -123,7 +123,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadUpdatedAll()
     auto in_ptr = std::make_unique<ReadWriteBufferFromHTTP>(
         uri, Poco::Net::HTTPRequest::HTTP_GET, ReadWriteBufferFromHTTP::OutStreamCallback(), timeouts,
         0, credentials, DBMS_DEFAULT_BUFFER_SIZE, header_entries);
-    auto input_stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, *in_ptr, sample_block, max_block_size);
     return std::make_shared<OwningBlockInputStream<ReadWriteBufferFromHTTP>>(input_stream, std::move(in_ptr));
 }
 
@@ -136,7 +136,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadIds(const std::vector<UInt64> & id
     ReadWriteBufferFromHTTP::OutStreamCallback out_stream_callback = [block, this](std::ostream & ostr)
     {
         WriteBufferFromOStream out_buffer(ostr);
-        auto output_stream = context.getOutputStreamParallelIfPossible(format, out_buffer, sample_block);
+        auto output_stream = context->getOutputStreamParallelIfPossible(format, out_buffer, sample_block);
         formatBlock(output_stream, block);
     };
 
@@ -144,7 +144,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadIds(const std::vector<UInt64> & id
     auto in_ptr = std::make_unique<ReadWriteBufferFromHTTP>(
         uri, Poco::Net::HTTPRequest::HTTP_POST, out_stream_callback, timeouts,
         0, credentials, DBMS_DEFAULT_BUFFER_SIZE, header_entries);
-    auto input_stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, *in_ptr, sample_block, max_block_size);
     return std::make_shared<OwningBlockInputStream<ReadWriteBufferFromHTTP>>(input_stream, std::move(in_ptr));
 }
 
@@ -157,7 +157,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadKeys(const Columns & key_columns,
     ReadWriteBufferFromHTTP::OutStreamCallback out_stream_callback = [block, this](std::ostream & ostr)
     {
         WriteBufferFromOStream out_buffer(ostr);
-        auto output_stream = context.getOutputStreamParallelIfPossible(format, out_buffer, sample_block);
+        auto output_stream = context->getOutputStreamParallelIfPossible(format, out_buffer, sample_block);
         formatBlock(output_stream, block);
     };
 
@@ -165,7 +165,7 @@ BlockInputStreamPtr HTTPDictionarySource::loadKeys(const Columns & key_columns,
     auto in_ptr = std::make_unique<ReadWriteBufferFromHTTP>(
         uri, Poco::Net::HTTPRequest::HTTP_POST, out_stream_callback, timeouts,
         0, credentials, DBMS_DEFAULT_BUFFER_SIZE, header_entries);
-    auto input_stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
+    auto input_stream = context->getInputFormat(format, *in_ptr, sample_block, max_block_size);
     return std::make_shared<OwningBlockInputStream<ReadWriteBufferFromHTTP>>(input_stream, std::move(in_ptr));
 }
 
@@ -201,14 +201,14 @@ void registerDictionarySourceHTTP(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & /* default_database */,
                                  bool check_config) -> DictionarySourcePtr
     {
         if (dict_struct.has_expressions)
             throw Exception{"Dictionary source of type `http` does not support attribute expressions", ErrorCodes::LOGICAL_ERROR};
 
-        Context context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
+        auto context_local_copy = copyContextAndApplySettings(config_prefix, context, config);
 
         return std::make_unique<HTTPDictionarySource>(
             dict_struct, config, config_prefix + ".http",
diff --git a/src/Dictionaries/HTTPDictionarySource.h b/src/Dictionaries/HTTPDictionarySource.h
index e7920132e83..c42c67ec8c9 100644
--- a/src/Dictionaries/HTTPDictionarySource.h
+++ b/src/Dictionaries/HTTPDictionarySource.h
@@ -26,7 +26,7 @@ public:
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix,
         Block & sample_block_,
-        const Context & context_,
+        ContextPtr context_,
         bool check_config);
 
     HTTPDictionarySource(const HTTPDictionarySource & other);
@@ -65,7 +65,7 @@ private:
     std::string update_field;
     const std::string format;
     Block sample_block;
-    Context context;
+    ContextPtr context;
     ConnectionTimeouts timeouts;
 };
 
diff --git a/src/Dictionaries/LibraryDictionarySource.cpp b/src/Dictionaries/LibraryDictionarySource.cpp
index d327c85f979..f09869b5a30 100644
--- a/src/Dictionaries/LibraryDictionarySource.cpp
+++ b/src/Dictionaries/LibraryDictionarySource.cpp
@@ -32,7 +32,7 @@ LibraryDictionarySource::LibraryDictionarySource(
     const Poco::Util::AbstractConfiguration & config,
     const std::string & config_prefix_,
     Block & sample_block_,
-    const Context & context_,
+    ContextPtr context_,
     bool check_config)
     : log(&Poco::Logger::get("LibraryDictionarySource"))
     , dict_struct{dict_struct_}
@@ -40,12 +40,12 @@ LibraryDictionarySource::LibraryDictionarySource(
     , path{config.getString(config_prefix + ".path", "")}
     , dictionary_id(getDictID())
     , sample_block{sample_block_}
-    , context(context_)
+    , context(Context::createCopy(context_))
 {
 
     if (check_config)
     {
-        const String dictionaries_lib_path = context.getDictionariesLibPath();
+        const String dictionaries_lib_path = context->getDictionariesLibPath();
         if (!startsWith(path, dictionaries_lib_path))
             throw Exception(ErrorCodes::PATH_ACCESS_DENIED, "LibraryDictionarySource: Library path {} is not inside {}", path, dictionaries_lib_path);
     }
@@ -178,7 +178,7 @@ void registerDictionarySourceLibrary(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & context,
+                                 ContextPtr context,
                                  const std::string & /* default_database */,
                                  bool check_config) -> DictionarySourcePtr
     {
diff --git a/src/Dictionaries/LibraryDictionarySource.h b/src/Dictionaries/LibraryDictionarySource.h
index 2c726602660..d43a4de44a3 100644
--- a/src/Dictionaries/LibraryDictionarySource.h
+++ b/src/Dictionaries/LibraryDictionarySource.h
@@ -7,6 +7,7 @@
 #include "DictionaryStructure.h"
 #include <Core/ExternalResultDescription.h>
 #include "IDictionarySource.h"
+#include <Interpreters/Context_fwd.h>
 
 
 namespace Poco
@@ -38,7 +39,7 @@ public:
         const Poco::Util::AbstractConfiguration & config,
         const std::string & config_prefix_,
         Block & sample_block_,
-        const Context & context_,
+        ContextPtr context_,
         bool check_config);
 
     LibraryDictionarySource(const LibraryDictionarySource & other);
@@ -85,7 +86,7 @@ private:
     const Field dictionary_id;
 
     Block sample_block;
-    Context context;
+    ContextPtr context;
 
     LibraryBridgeHelperPtr bridge_helper;
     ExternalResultDescription description;
diff --git a/src/Dictionaries/MongoDBDictionarySource.cpp b/src/Dictionaries/MongoDBDictionarySource.cpp
index 5b5d0c4d20f..1fa08257493 100644
--- a/src/Dictionaries/MongoDBDictionarySource.cpp
+++ b/src/Dictionaries/MongoDBDictionarySource.cpp
@@ -13,7 +13,7 @@ void registerDictionarySourceMongoDB(DictionarySourceFactory & factory)
         const Poco::Util::AbstractConfiguration & config,
         const std::string & root_config_prefix,
         Block & sample_block,
-        const Context &,
+        ContextPtr,
         const std::string & /* default_database */,
         bool /* check_config */)
     {
diff --git a/src/Dictionaries/MySQLDictionarySource.cpp b/src/Dictionaries/MySQLDictionarySource.cpp
index d371f01d9e8..730f27f620f 100644
--- a/src/Dictionaries/MySQLDictionarySource.cpp
+++ b/src/Dictionaries/MySQLDictionarySource.cpp
@@ -18,7 +18,7 @@ void registerDictionarySourceMysql(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & config_prefix,
                                  Block & sample_block,
-                                 const Context & /* context */,
+                                 ContextPtr /* context */,
                                  const std::string & /* default_database */,
                                  bool /* check_config */) -> DictionarySourcePtr {
 #if USE_MYSQL
diff --git a/src/Dictionaries/PostgreSQLDictionarySource.cpp b/src/Dictionaries/PostgreSQLDictionarySource.cpp
index a952781db66..ac3a17618e4 100644
--- a/src/Dictionaries/PostgreSQLDictionarySource.cpp
+++ b/src/Dictionaries/PostgreSQLDictionarySource.cpp
@@ -167,7 +167,7 @@ void registerDictionarySourcePostgreSQL(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & config,
                                  const std::string & root_config_prefix,
                                  Block & sample_block,
-                                 const Context & /* context */,
+                                 ContextPtr /* context */,
                                  const std::string & /* default_database */,
                                  bool /* check_config */) -> DictionarySourcePtr
     {
diff --git a/src/Dictionaries/RedisDictionarySource.cpp b/src/Dictionaries/RedisDictionarySource.cpp
index f1d0c0c5d3c..71b6c95ab82 100644
--- a/src/Dictionaries/RedisDictionarySource.cpp
+++ b/src/Dictionaries/RedisDictionarySource.cpp
@@ -12,7 +12,7 @@ void registerDictionarySourceRedis(DictionarySourceFactory & factory)
                                    const Poco::Util::AbstractConfiguration & config,
                                    const String & config_prefix,
                                    Block & sample_block,
-                                   const Context & /* context */,
+                                   ContextPtr /* context */,
                                    const std::string & /* default_database */,
                                    bool /* check_config */) -> DictionarySourcePtr {
         return std::make_unique<RedisDictionarySource>(dict_struct, config, config_prefix + ".redis", sample_block);
diff --git a/src/Dictionaries/XDBCDictionarySource.cpp b/src/Dictionaries/XDBCDictionarySource.cpp
index 9543c5a69cf..c76ca7981f3 100644
--- a/src/Dictionaries/XDBCDictionarySource.cpp
+++ b/src/Dictionaries/XDBCDictionarySource.cpp
@@ -40,7 +40,7 @@ namespace
             const Poco::URI & uri,
             std::function<void(std::ostream &)> callback,
             const Block & sample_block,
-            const Context & context,
+            ContextPtr context,
             UInt64 max_block_size,
             const ConnectionTimeouts & timeouts,
             const String name_)
@@ -105,9 +105,10 @@ XDBCDictionarySource::XDBCDictionarySource(
     const Poco::Util::AbstractConfiguration & config_,
     const std::string & config_prefix_,
     const Block & sample_block_,
-    const Context & context_,
+    ContextPtr context_,
     const BridgeHelperPtr bridge_)
-    : log(&Poco::Logger::get(bridge_->getName() + "DictionarySource"))
+    : WithContext(context_->getGlobalContext())
+    , log(&Poco::Logger::get(bridge_->getName() + "DictionarySource"))
     , update_time{std::chrono::system_clock::from_time_t(0)}
     , dict_struct{dict_struct_}
     , db{config_.getString(config_prefix_ + ".db", "")}
@@ -121,7 +122,6 @@ XDBCDictionarySource::XDBCDictionarySource(
     , invalidate_query{config_.getString(config_prefix_ + ".invalidate_query", "")}
     , bridge_helper{bridge_}
     , timeouts{ConnectionTimeouts::getHTTPTimeouts(context_)}
-    , global_context(context_.getGlobalContext())
 {
     bridge_url = bridge_helper->getMainURI();
 
@@ -132,7 +132,8 @@ XDBCDictionarySource::XDBCDictionarySource(
 
 /// copy-constructor is provided in order to support cloneability
 XDBCDictionarySource::XDBCDictionarySource(const XDBCDictionarySource & other)
-    : log(&Poco::Logger::get(other.bridge_helper->getName() + "DictionarySource"))
+    : WithContext(other.getContext())
+    , log(&Poco::Logger::get(other.bridge_helper->getName() + "DictionarySource"))
     , update_time{other.update_time}
     , dict_struct{other.dict_struct}
     , db{other.db}
@@ -147,7 +148,6 @@ XDBCDictionarySource::XDBCDictionarySource(const XDBCDictionarySource & other)
     , bridge_helper{other.bridge_helper}
     , bridge_url{other.bridge_url}
     , timeouts{other.timeouts}
-    , global_context{other.global_context}
 {
 }
 
@@ -243,7 +243,7 @@ std::string XDBCDictionarySource::doInvalidateQuery(const std::string & request)
         invalidate_url,
         [request](std::ostream & os) { os << "query=" << request; },
         invalidate_sample_block,
-        global_context,
+        getContext(),
         max_block_size,
         timeouts,
         bridge_helper->getName() + "BlockInputStream");
@@ -258,7 +258,7 @@ BlockInputStreamPtr XDBCDictionarySource::loadBase(const std::string & query) co
         bridge_url,
         [query](std::ostream & os) { os << "query=" << query; },
         sample_block,
-        global_context,
+        getContext(),
         max_block_size,
         timeouts,
         bridge_helper->getName() + "BlockInputStream");
@@ -274,12 +274,12 @@ void registerDictionarySourceXDBC(DictionarySourceFactory & factory)
                                    const Poco::Util::AbstractConfiguration & config,
                                    const std::string & config_prefix,
                                    Block & sample_block,
-                                   const Context & context,
+                                   ContextPtr context,
                                    const std::string & /* default_database */,
                                    bool /* check_config */) -> DictionarySourcePtr {
 #if USE_ODBC
         BridgeHelperPtr bridge = std::make_shared<XDBCBridgeHelper<ODBCBridgeMixin>>(
-            context, context.getSettings().http_receive_timeout, config.getString(config_prefix + ".odbc.connection_string"));
+            context, context->getSettings().http_receive_timeout, config.getString(config_prefix + ".odbc.connection_string"));
         return std::make_unique<XDBCDictionarySource>(dict_struct, config, config_prefix + ".odbc", sample_block, context, bridge);
 #else
         (void)dict_struct;
@@ -300,7 +300,7 @@ void registerDictionarySourceJDBC(DictionarySourceFactory & factory)
                                  const Poco::Util::AbstractConfiguration & /* config */,
                                  const std::string & /* config_prefix */,
                                  Block & /* sample_block */,
-                                 const Context & /* context */,
+                                 ContextPtr /* context */,
                                  const std::string & /* default_database */,
                                  bool /* check_config */) -> DictionarySourcePtr {
         throw Exception{"Dictionary source of type `jdbc` is disabled until consistent support for nullable fields.",
diff --git a/src/Dictionaries/XDBCDictionarySource.h b/src/Dictionaries/XDBCDictionarySource.h
index b595341ff7a..438f48027e5 100644
--- a/src/Dictionaries/XDBCDictionarySource.h
+++ b/src/Dictionaries/XDBCDictionarySource.h
@@ -23,7 +23,7 @@ class Logger;
 namespace DB
 {
 /// Allows loading dictionaries from a XDBC source via bridges
-class XDBCDictionarySource final : public IDictionarySource
+class XDBCDictionarySource final : public IDictionarySource, WithContext
 {
 public:
     XDBCDictionarySource(
@@ -31,7 +31,7 @@ public:
         const Poco::Util::AbstractConfiguration & config_,
         const std::string & config_prefix_,
         const Block & sample_block_,
-        const Context & context_,
+        ContextPtr context_,
         BridgeHelperPtr bridge);
 
     /// copy-constructor is provided in order to support cloneability
@@ -82,7 +82,6 @@ private:
     BridgeHelperPtr bridge_helper;
     Poco::URI bridge_url;
     ConnectionTimeouts timeouts;
-    const Context & global_context;
 };
 
 }
diff --git a/src/Dictionaries/getDictionaryConfigurationFromAST.cpp b/src/Dictionaries/getDictionaryConfigurationFromAST.cpp
index 04ba1db09fc..96c41fb949e 100644
--- a/src/Dictionaries/getDictionaryConfigurationFromAST.cpp
+++ b/src/Dictionaries/getDictionaryConfigurationFromAST.cpp
@@ -374,7 +374,7 @@ void buildConfigurationFromFunctionWithKeyValueArguments(
     AutoPtr<Document> doc,
     AutoPtr<Element> root,
     const ASTExpressionList * ast_expr_list,
-    const Context & context)
+    ContextPtr context)
 {
     const auto & children = ast_expr_list->children;
     for (size_t i = 0; i != children.size(); ++i)
@@ -442,7 +442,7 @@ void buildSourceConfiguration(
     AutoPtr<Element> root,
     const ASTFunctionWithKeyValueArguments * source,
     const ASTDictionarySettings * settings,
-    const Context & context)
+    ContextPtr context)
 {
     AutoPtr<Element> outer_element(doc->createElement("source"));
     root->appendChild(outer_element);
@@ -503,7 +503,7 @@ void checkPrimaryKey(const NamesToTypeNames & all_attrs, const Names & key_attrs
 
 
 DictionaryConfigurationPtr
-getDictionaryConfigurationFromAST(const ASTCreateQuery & query, const Context & context, const std::string & database_)
+getDictionaryConfigurationFromAST(const ASTCreateQuery & query, ContextPtr context, const std::string & database_)
 {
     checkAST(query);
 
diff --git a/src/Dictionaries/getDictionaryConfigurationFromAST.h b/src/Dictionaries/getDictionaryConfigurationFromAST.h
index 5132e3c77e0..de8659e4d7b 100644
--- a/src/Dictionaries/getDictionaryConfigurationFromAST.h
+++ b/src/Dictionaries/getDictionaryConfigurationFromAST.h
@@ -2,6 +2,7 @@
 
 #include <Poco/Util/AbstractConfiguration.h>
 #include <Parsers/ASTCreateQuery.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
@@ -11,5 +12,5 @@ using DictionaryConfigurationPtr = Poco::AutoPtr<Poco::Util::AbstractConfigurati
 /// This function is necessary because all loadable objects configuration are Poco::AbstractConfiguration
 /// Can throw exception if query is ill-formed
 DictionaryConfigurationPtr
-getDictionaryConfigurationFromAST(const ASTCreateQuery & query, const Context & context, const std::string & database_ = "");
+getDictionaryConfigurationFromAST(const ASTCreateQuery & query, ContextPtr context, const std::string & database_ = "");
 }
diff --git a/src/Disks/DiskFactory.cpp b/src/Disks/DiskFactory.cpp
index b604269ae16..03412be9729 100644
--- a/src/Disks/DiskFactory.cpp
+++ b/src/Disks/DiskFactory.cpp
@@ -24,7 +24,7 @@ DiskPtr DiskFactory::create(
     const String & name,
     const Poco::Util::AbstractConfiguration & config,
     const String & config_prefix,
-    const Context & context) const
+    ContextConstPtr context) const
 {
     const auto disk_type = config.getString(config_prefix + ".type", "local");
 
diff --git a/src/Disks/DiskFactory.h b/src/Disks/DiskFactory.h
index d41f14bd753..ba833d9e25f 100644
--- a/src/Disks/DiskFactory.h
+++ b/src/Disks/DiskFactory.h
@@ -1,17 +1,18 @@
 #pragma once
 
-#include <common/types.h>
 #include <Disks/IDisk.h>
+#include <Interpreters/Context_fwd.h>
+#include <common/types.h>
+
+#include <boost/noncopyable.hpp>
+#include <Poco/Util/AbstractConfiguration.h>
 
 #include <functional>
 #include <unordered_map>
-#include <boost/noncopyable.hpp>
-#include <Poco/Util/AbstractConfiguration.h>
 
 
 namespace DB
 {
-class Context;
 
 /**
  * Disk factory. Responsible for creating new disk objects.
@@ -23,7 +24,7 @@ public:
         const String & name,
         const Poco::Util::AbstractConfiguration & config,
         const String & config_prefix,
-        const Context & context)>;
+        ContextConstPtr context)>;
 
     static DiskFactory & instance();
 
@@ -33,7 +34,7 @@ public:
         const String & name,
         const Poco::Util::AbstractConfiguration & config,
         const String & config_prefix,
-        const Context & context) const;
+        ContextConstPtr context) const;
 
 private:
     using DiskTypeRegistry = std::unordered_map<String, Creator>;
diff --git a/src/Disks/DiskLocal.cpp b/src/Disks/DiskLocal.cpp
index 69732bc271e..9d2bad0373d 100644
--- a/src/Disks/DiskLocal.cpp
+++ b/src/Disks/DiskLocal.cpp
@@ -363,7 +363,7 @@ void registerDiskLocal(DiskFactory & factory)
     auto creator = [](const String & name,
                       const Poco::Util::AbstractConfiguration & config,
                       const String & config_prefix,
-                      const Context & context) -> DiskPtr {
+                      ContextConstPtr context) -> DiskPtr {
         String path = config.getString(config_prefix + ".path", "");
         if (name == "default")
         {
@@ -371,7 +371,7 @@ void registerDiskLocal(DiskFactory & factory)
                 throw Exception(
                     "\"default\" disk path should be provided in <path> not it <storage_configuration>",
                     ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG);
-            path = context.getPath();
+            path = context->getPath();
         }
         else
         {
@@ -402,7 +402,7 @@ void registerDiskLocal(DiskFactory & factory)
                 throw Exception("'keep_free_space_ratio' have to be between 0 and 1", ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG);
             String tmp_path = path;
             if (tmp_path.empty())
-                tmp_path = context.getPath();
+                tmp_path = context->getPath();
 
             // Create tmp disk for getting total disk space.
             keep_free_space_bytes = static_cast<UInt64>(DiskLocal("tmp", tmp_path, 0).getTotalSpace() * ratio);
diff --git a/src/Disks/DiskMemory.cpp b/src/Disks/DiskMemory.cpp
index d8b3c74d0d9..68257ec4948 100644
--- a/src/Disks/DiskMemory.cpp
+++ b/src/Disks/DiskMemory.cpp
@@ -451,7 +451,7 @@ void registerDiskMemory(DiskFactory & factory)
     auto creator = [](const String & name,
                       const Poco::Util::AbstractConfiguration & /*config*/,
                       const String & /*config_prefix*/,
-                      const Context & /*context*/) -> DiskPtr { return std::make_shared<DiskMemory>(name); };
+                      ContextConstPtr /*context*/) -> DiskPtr { return std::make_shared<DiskMemory>(name); };
     factory.registerDiskType("memory", creator);
 }
 
diff --git a/src/Disks/DiskSelector.cpp b/src/Disks/DiskSelector.cpp
index 0fb728a4f02..e317d8508da 100644
--- a/src/Disks/DiskSelector.cpp
+++ b/src/Disks/DiskSelector.cpp
@@ -18,7 +18,7 @@ namespace ErrorCodes
     extern const int UNKNOWN_DISK;
 }
 
-DiskSelector::DiskSelector(const Poco::Util::AbstractConfiguration & config, const String & config_prefix, const Context & context)
+DiskSelector::DiskSelector(const Poco::Util::AbstractConfiguration & config, const String & config_prefix, ContextConstPtr context)
 {
     Poco::Util::AbstractConfiguration::Keys keys;
     config.keys(config_prefix, keys);
@@ -40,12 +40,12 @@ DiskSelector::DiskSelector(const Poco::Util::AbstractConfiguration & config, con
         disks.emplace(disk_name, factory.create(disk_name, config, disk_config_prefix, context));
     }
     if (!has_default_disk)
-        disks.emplace(default_disk_name, std::make_shared<DiskLocal>(default_disk_name, context.getPath(), 0));
+        disks.emplace(default_disk_name, std::make_shared<DiskLocal>(default_disk_name, context->getPath(), 0));
 }
 
 
 DiskSelectorPtr DiskSelector::updateFromConfig(
-    const Poco::Util::AbstractConfiguration & config, const String & config_prefix, const Context & context) const
+    const Poco::Util::AbstractConfiguration & config, const String & config_prefix, ContextPtr context) const
 {
     Poco::Util::AbstractConfiguration::Keys keys;
     config.keys(config_prefix, keys);
diff --git a/src/Disks/DiskSelector.h b/src/Disks/DiskSelector.h
index 5d023fe1fbc..6b7e8174d3d 100644
--- a/src/Disks/DiskSelector.h
+++ b/src/Disks/DiskSelector.h
@@ -10,7 +10,6 @@
 namespace DB
 {
 
-class Context;
 class DiskSelector;
 using DiskSelectorPtr = std::shared_ptr<const DiskSelector>;
 using DisksMap = std::map<String, DiskPtr>;
@@ -20,13 +19,13 @@ using DisksMap = std::map<String, DiskPtr>;
 class DiskSelector
 {
 public:
-    DiskSelector(const Poco::Util::AbstractConfiguration & config, const String & config_prefix, const Context & context);
+    DiskSelector(const Poco::Util::AbstractConfiguration & config, const String & config_prefix, ContextConstPtr context);
     DiskSelector(const DiskSelector & from) : disks(from.disks) { }
 
     DiskSelectorPtr updateFromConfig(
         const Poco::Util::AbstractConfiguration & config,
         const String & config_prefix,
-        const Context & context
+        ContextPtr context
     ) const;
 
     /// Get disk by name
diff --git a/src/Disks/S3/registerDiskS3.cpp b/src/Disks/S3/registerDiskS3.cpp
index 3ce2f909760..a15b6bcf822 100644
--- a/src/Disks/S3/registerDiskS3.cpp
+++ b/src/Disks/S3/registerDiskS3.cpp
@@ -109,13 +109,13 @@ void registerDiskS3(DiskFactory & factory)
     auto creator = [](const String & name,
                       const Poco::Util::AbstractConfiguration & config,
                       const String & config_prefix,
-                      const Context & context) -> DiskPtr {
-        Poco::File disk{context.getPath() + "disks/" + name};
+                      ContextConstPtr context) -> DiskPtr {
+        Poco::File disk{context->getPath() + "disks/" + name};
         disk.createDirectories();
 
         S3::PocoHTTPClientConfiguration client_configuration = S3::ClientFactory::instance().createClientConfiguration(
-            context.getRemoteHostFilter(),
-            context.getGlobalContext().getSettingsRef().s3_max_redirects);
+            context->getRemoteHostFilter(),
+            context->getGlobalContext()->getSettingsRef().s3_max_redirects);
 
         S3::URI uri(Poco::URI(config.getString(config_prefix + ".endpoint")));
         if (uri.key.back() != '/')
@@ -143,7 +143,7 @@ void registerDiskS3(DiskFactory & factory)
             config.getBool(config_prefix + ".use_environment_credentials", config.getBool("s3.use_environment_credentials", false))
         );
 
-        String metadata_path = config.getString(config_prefix + ".metadata_path", context.getPath() + "disks/" + name + "/");
+        String metadata_path = config.getString(config_prefix + ".metadata_path", context->getPath() + "disks/" + name + "/");
 
         auto s3disk = std::make_shared<DiskS3>(
             name,
@@ -152,8 +152,8 @@ void registerDiskS3(DiskFactory & factory)
             uri.bucket,
             uri.key,
             metadata_path,
-            context.getSettingsRef().s3_min_upload_part_size,
-            context.getSettingsRef().s3_max_single_part_upload_size,
+            context->getSettingsRef().s3_min_upload_part_size,
+            context->getSettingsRef().s3_max_single_part_upload_size,
             config.getUInt64(config_prefix + ".min_bytes_for_seek", 1024 * 1024),
             config.getBool(config_prefix + ".send_metadata", false),
             config.getInt(config_prefix + ".thread_pool_size", 16),
@@ -174,7 +174,7 @@ void registerDiskS3(DiskFactory & factory)
 
         if (cache_enabled)
         {
-            String cache_path = config.getString(config_prefix + ".cache_path", context.getPath() + "disks/" + name + "/cache/");
+            String cache_path = config.getString(config_prefix + ".cache_path", context->getPath() + "disks/" + name + "/cache/");
 
             if (metadata_path == cache_path)
                 throw Exception("Metadata and cache path should be different: " + metadata_path, ErrorCodes::BAD_ARGUMENTS);
diff --git a/src/Formats/FormatFactory.cpp b/src/Formats/FormatFactory.cpp
index 6d3eb6ee18f..6774c5eed88 100644
--- a/src/Formats/FormatFactory.cpp
+++ b/src/Formats/FormatFactory.cpp
@@ -43,16 +43,15 @@ const FormatFactory::Creators & FormatFactory::getCreators(const String & name)
     throw Exception("Unknown format " + name, ErrorCodes::UNKNOWN_FORMAT);
 }
 
-FormatSettings getFormatSettings(const Context & context)
+FormatSettings getFormatSettings(ContextConstPtr context)
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
 
     return getFormatSettings(context, settings);
 }
 
 template <typename Settings>
-FormatSettings getFormatSettings(const Context & context,
-    const Settings & settings)
+FormatSettings getFormatSettings(ContextConstPtr context, const Settings & settings)
 {
     FormatSettings format_settings;
 
@@ -99,8 +98,8 @@ FormatSettings getFormatSettings(const Context & context,
     format_settings.regexp.regexp = settings.format_regexp;
     format_settings.regexp.skip_unmatched = settings.format_regexp_skip_unmatched;
     format_settings.schema.format_schema = settings.format_schema;
-    format_settings.schema.format_schema_path = context.getFormatSchemaPath();
-    format_settings.schema.is_server = context.hasGlobalContext() && (context.getGlobalContext().getApplicationType() == Context::ApplicationType::SERVER);
+    format_settings.schema.format_schema_path = context->getFormatSchemaPath();
+    format_settings.schema.is_server = context->hasGlobalContext() && (context->getGlobalContext()->getApplicationType() == Context::ApplicationType::SERVER);
     format_settings.skip_unknown_fields = settings.input_format_skip_unknown_fields;
     format_settings.template_settings.resultset_format = settings.format_template_resultset;
     format_settings.template_settings.row_between_delimiter = settings.format_template_rows_between_delimiter;
@@ -120,26 +119,22 @@ FormatSettings getFormatSettings(const Context & context,
     {
         const Poco::URI & avro_schema_registry_url = settings.format_avro_schema_registry_url;
         if (!avro_schema_registry_url.empty())
-            context.getRemoteHostFilter().checkURL(avro_schema_registry_url);
+            context->getRemoteHostFilter().checkURL(avro_schema_registry_url);
     }
 
     return format_settings;
 }
 
-template
-FormatSettings getFormatSettings<FormatFactorySettings>(const Context & context,
-    const FormatFactorySettings & settings);
+template FormatSettings getFormatSettings<FormatFactorySettings>(ContextConstPtr context, const FormatFactorySettings & settings);
 
-template
-FormatSettings getFormatSettings<Settings>(const Context & context,
-    const Settings & settings);
+template FormatSettings getFormatSettings<Settings>(ContextConstPtr context, const Settings & settings);
 
 
 InputFormatPtr FormatFactory::getInput(
     const String & name,
     ReadBuffer & buf,
     const Block & sample,
-    const Context & context,
+    ContextConstPtr context,
     UInt64 max_block_size,
     const std::optional<FormatSettings> & _format_settings) const
 {
@@ -154,7 +149,7 @@ InputFormatPtr FormatFactory::getInput(
         throw Exception("Format " + name + " is not suitable for input (with processors)", ErrorCodes::FORMAT_IS_NOT_SUITABLE_FOR_INPUT);
     }
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     const auto & file_segmentation_engine = getCreators(name).file_segmentation_engine;
 
     // Doesn't make sense to use parallel parsing with less than four threads
@@ -204,13 +199,17 @@ InputFormatPtr FormatFactory::getInput(
     return format;
 }
 
-BlockOutputStreamPtr FormatFactory::getOutputStreamParallelIfPossible(const String & name,
-    WriteBuffer & buf, const Block & sample, const Context & context,
-    WriteCallback callback, const std::optional<FormatSettings> & _format_settings) const
+BlockOutputStreamPtr FormatFactory::getOutputStreamParallelIfPossible(
+    const String & name,
+    WriteBuffer & buf,
+    const Block & sample,
+    ContextConstPtr context,
+    WriteCallback callback,
+    const std::optional<FormatSettings> & _format_settings) const
 {
     const auto & output_getter = getCreators(name).output_processor_creator;
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     bool parallel_formatting = settings.output_format_parallel_formatting;
 
     if (output_getter && parallel_formatting && getCreators(name).supports_parallel_formatting
@@ -237,12 +236,15 @@ BlockOutputStreamPtr FormatFactory::getOutputStreamParallelIfPossible(const Stri
 }
 
 
-BlockOutputStreamPtr FormatFactory::getOutputStream(const String & name,
-    WriteBuffer & buf, const Block & sample, const Context & context,
-    WriteCallback callback, const std::optional<FormatSettings> & _format_settings) const
+BlockOutputStreamPtr FormatFactory::getOutputStream(
+    const String & name,
+    WriteBuffer & buf,
+    const Block & sample,
+    ContextConstPtr context,
+    WriteCallback callback,
+    const std::optional<FormatSettings> & _format_settings) const
 {
-    auto format_settings = _format_settings
-        ? *_format_settings : getFormatSettings(context);
+    auto format_settings = _format_settings ? *_format_settings : getFormatSettings(context);
 
     if (!getCreators(name).output_processor_creator)
     {
@@ -267,7 +269,7 @@ InputFormatPtr FormatFactory::getInputFormat(
     const String & name,
     ReadBuffer & buf,
     const Block & sample,
-    const Context & context,
+    ContextConstPtr context,
     UInt64 max_block_size,
     const std::optional<FormatSettings> & _format_settings) const
 {
@@ -275,13 +277,12 @@ InputFormatPtr FormatFactory::getInputFormat(
     if (!input_getter)
         throw Exception("Format " + name + " is not suitable for input", ErrorCodes::FORMAT_IS_NOT_SUITABLE_FOR_INPUT);
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
-    if (context.hasQueryContext() && settings.log_queries)
-        context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
+    if (context->hasQueryContext() && settings.log_queries)
+        context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
 
-    auto format_settings = _format_settings
-        ? *_format_settings : getFormatSettings(context);
+    auto format_settings = _format_settings ? *_format_settings : getFormatSettings(context);
 
     RowInputFormatParams params;
     params.max_block_size = max_block_size;
@@ -299,18 +300,20 @@ InputFormatPtr FormatFactory::getInputFormat(
 }
 
 OutputFormatPtr FormatFactory::getOutputFormatParallelIfPossible(
-    const String & name, WriteBuffer & buf, const Block & sample,
-    const Context & context, WriteCallback callback,
+    const String & name,
+    WriteBuffer & buf,
+    const Block & sample,
+    ContextConstPtr context,
+    WriteCallback callback,
     const std::optional<FormatSettings> & _format_settings) const
 {
     const auto & output_getter = getCreators(name).output_processor_creator;
     if (!output_getter)
         throw Exception("Format " + name + " is not suitable for output (with processors)", ErrorCodes::FORMAT_IS_NOT_SUITABLE_FOR_OUTPUT);
 
-    auto format_settings = _format_settings
-        ? *_format_settings : getFormatSettings(context);
+    auto format_settings = _format_settings ? *_format_settings : getFormatSettings(context);
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     if (settings.output_format_parallel_formatting && getCreators(name).supports_parallel_formatting
         && !settings.output_format_json_array_of_rows)
@@ -321,8 +324,8 @@ OutputFormatPtr FormatFactory::getOutputFormatParallelIfPossible(
 
         ParallelFormattingOutputFormat::Params builder{buf, sample, formatter_creator, settings.max_threads};
 
-        if (context.hasQueryContext() && settings.log_queries)
-            context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
+        if (context->hasQueryContext() && settings.log_queries)
+            context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
 
         return std::make_shared<ParallelFormattingOutputFormat>(builder);
     }
@@ -332,16 +335,19 @@ OutputFormatPtr FormatFactory::getOutputFormatParallelIfPossible(
 
 
 OutputFormatPtr FormatFactory::getOutputFormat(
-    const String & name, WriteBuffer & buf, const Block & sample,
-    const Context & context, WriteCallback callback,
+    const String & name,
+    WriteBuffer & buf,
+    const Block & sample,
+    ContextConstPtr context,
+    WriteCallback callback,
     const std::optional<FormatSettings> & _format_settings) const
 {
     const auto & output_getter = getCreators(name).output_processor_creator;
     if (!output_getter)
         throw Exception("Format " + name + " is not suitable for output (with processors)", ErrorCodes::FORMAT_IS_NOT_SUITABLE_FOR_OUTPUT);
 
-    if (context.hasQueryContext() && context.getSettingsRef().log_queries)
-        context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
+    if (context->hasQueryContext() && context->getSettingsRef().log_queries)
+        context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Format, name);
 
     RowOutputFormatParams params;
     params.callback = std::move(callback);
diff --git a/src/Formats/FormatFactory.h b/src/Formats/FormatFactory.h
index 3a21ef91d35..d5e4b1b0341 100644
--- a/src/Formats/FormatFactory.h
+++ b/src/Formats/FormatFactory.h
@@ -1,21 +1,22 @@
 #pragma once
 
-#include <common/types.h>
 #include <Columns/IColumn.h>
 #include <DataStreams/IBlockStream_fwd.h>
 #include <Formats/FormatSettings.h>
+#include <Interpreters/Context_fwd.h>
 #include <IO/BufferWithOwnMemory.h>
+#include <common/types.h>
+
+#include <boost/noncopyable.hpp>
 
 #include <functional>
 #include <memory>
 #include <unordered_map>
-#include <boost/noncopyable.hpp>
 
 namespace DB
 {
 
 class Block;
-class Context;
 struct Settings;
 struct FormatFactorySettings;
 
@@ -34,11 +35,10 @@ struct RowOutputFormatParams;
 using InputFormatPtr = std::shared_ptr<IInputFormat>;
 using OutputFormatPtr = std::shared_ptr<IOutputFormat>;
 
-FormatSettings getFormatSettings(const Context & context);
+FormatSettings getFormatSettings(ContextConstPtr context);
 
 template <typename T>
-FormatSettings getFormatSettings(const Context & context,
-    const T & settings);
+FormatSettings getFormatSettings(ContextConstPtr context, const T & settings);
 
 /** Allows to create an IBlockInputStream or IBlockOutputStream by the name of the format.
   * Note: format and compression are independent things.
@@ -113,38 +113,52 @@ public:
         const String & name,
         ReadBuffer & buf,
         const Block & sample,
-        const Context & context,
+        ContextConstPtr context,
         UInt64 max_block_size,
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     /// Checks all preconditions. Returns ordinary stream if parallel formatting cannot be done.
     /// Currently used only in Client. Don't use it something else! Better look at getOutputFormatParallelIfPossible.
-    BlockOutputStreamPtr getOutputStreamParallelIfPossible(const String & name, WriteBuffer & buf,
-        const Block & sample, const Context & context, WriteCallback callback = {},
+    BlockOutputStreamPtr getOutputStreamParallelIfPossible(
+        const String & name,
+        WriteBuffer & buf,
+        const Block & sample,
+        ContextConstPtr context,
+        WriteCallback callback = {},
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     /// Currently used only in Client. Don't use it something else! Better look at getOutputFormat.
-    BlockOutputStreamPtr getOutputStream(const String & name, WriteBuffer & buf,
-        const Block & sample, const Context & context, WriteCallback callback = {},
+    BlockOutputStreamPtr getOutputStream(
+        const String & name,
+        WriteBuffer & buf,
+        const Block & sample,
+        ContextConstPtr context,
+        WriteCallback callback = {},
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     InputFormatPtr getInputFormat(
         const String & name,
         ReadBuffer & buf,
         const Block & sample,
-        const Context & context,
+        ContextConstPtr context,
         UInt64 max_block_size,
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     /// Checks all preconditions. Returns ordinary format if parallel formatting cannot be done.
     OutputFormatPtr getOutputFormatParallelIfPossible(
-        const String & name, WriteBuffer & buf, const Block & sample,
-        const Context & context, WriteCallback callback = {},
+        const String & name,
+        WriteBuffer & buf,
+        const Block & sample,
+        ContextConstPtr context,
+        WriteCallback callback = {},
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     OutputFormatPtr getOutputFormat(
-        const String & name, WriteBuffer & buf, const Block & sample,
-        const Context & context, WriteCallback callback = {},
+        const String & name,
+        WriteBuffer & buf,
+        const Block & sample,
+        ContextConstPtr context,
+        WriteCallback callback = {},
         const std::optional<FormatSettings> & format_settings = std::nullopt) const;
 
     /// Register format by its name.
diff --git a/src/Functions/FunctionBase64Conversion.h b/src/Functions/FunctionBase64Conversion.h
index 4887e9fe8cc..d060b86c54b 100644
--- a/src/Functions/FunctionBase64Conversion.h
+++ b/src/Functions/FunctionBase64Conversion.h
@@ -61,7 +61,7 @@ class FunctionBase64Conversion : public IFunction
 public:
     static constexpr auto name = Func::name;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBase64Conversion>();
     }
diff --git a/src/Functions/FunctionBinaryArithmetic.h b/src/Functions/FunctionBinaryArithmetic.h
index bb85ae32622..ef9d05b4b5e 100644
--- a/src/Functions/FunctionBinaryArithmetic.h
+++ b/src/Functions/FunctionBinaryArithmetic.h
@@ -512,7 +512,7 @@ class FunctionBinaryArithmetic : public IFunction
     static constexpr const bool is_multiply = IsOperation<Op>::multiply;
     static constexpr const bool is_division = IsOperation<Op>::division;
 
-    const Context & context;
+    ContextPtr context;
     bool check_decimal_overflow = true;
 
     template <typename F>
@@ -593,7 +593,7 @@ class FunctionBinaryArithmetic : public IFunction
     }
 
     static FunctionOverloadResolverPtr
-    getFunctionForIntervalArithmetic(const DataTypePtr & type0, const DataTypePtr & type1, const Context & context)
+    getFunctionForIntervalArithmetic(const DataTypePtr & type0, const DataTypePtr & type1, ContextPtr context)
     {
         bool first_is_date_or_datetime = isDateOrDateTime(type0);
         bool second_is_date_or_datetime = isDateOrDateTime(type1);
@@ -939,9 +939,9 @@ class FunctionBinaryArithmetic : public IFunction
 
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionBinaryArithmetic>(context); }
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionBinaryArithmetic>(context); }
 
-    explicit FunctionBinaryArithmetic(const Context & context_)
+    explicit FunctionBinaryArithmetic(ContextPtr context_)
     :   context(context_),
         check_decimal_overflow(decimalCheckArithmeticOverflow(context))
     {}
@@ -955,7 +955,7 @@ public:
         return getReturnTypeImplStatic(arguments, context);
     }
 
-    static DataTypePtr getReturnTypeImplStatic(const DataTypes & arguments, const Context & context)
+    static DataTypePtr getReturnTypeImplStatic(const DataTypes & arguments, ContextPtr context)
     {
         /// Special case when multiply aggregate function state
         if (isAggregateMultiply(arguments[0], arguments[1]))
@@ -1367,7 +1367,7 @@ public:
         const ColumnWithTypeAndName & left_,
         const ColumnWithTypeAndName & right_,
         const DataTypePtr & return_type_,
-        const Context & context)
+        ContextPtr context)
     {
         return std::make_shared<FunctionBinaryArithmeticWithConstants>(left_, right_, return_type_, context);
     }
@@ -1376,7 +1376,7 @@ public:
         const ColumnWithTypeAndName & left_,
         const ColumnWithTypeAndName & right_,
         const DataTypePtr & return_type_,
-        const Context & context_)
+        ContextPtr context_)
         : Base(context_), left(left_), right(right_), return_type(return_type_)
     {
     }
@@ -1530,12 +1530,12 @@ class BinaryArithmeticOverloadResolver : public IFunctionOverloadResolverImpl
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionOverloadResolverImplPtr create(const Context & context)
+    static FunctionOverloadResolverImplPtr create(ContextPtr context)
     {
         return std::make_unique<BinaryArithmeticOverloadResolver>(context);
     }
 
-    explicit BinaryArithmeticOverloadResolver(const Context & context_) : context(context_) {}
+    explicit BinaryArithmeticOverloadResolver(ContextPtr context_) : context(context_) {}
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
@@ -1571,6 +1571,6 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 }
diff --git a/src/Functions/FunctionBitTestMany.h b/src/Functions/FunctionBitTestMany.h
index 6d527c66390..a2be56c42b0 100644
--- a/src/Functions/FunctionBitTestMany.h
+++ b/src/Functions/FunctionBitTestMany.h
@@ -24,7 +24,7 @@ struct FunctionBitTestMany : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitTestMany>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitTestMany>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionCustomWeekToSomething.h b/src/Functions/FunctionCustomWeekToSomething.h
index 5634ea11584..4050bb512bd 100644
--- a/src/Functions/FunctionCustomWeekToSomething.h
+++ b/src/Functions/FunctionCustomWeekToSomething.h
@@ -24,7 +24,7 @@ class FunctionCustomWeekToSomething : public IFunction
 {
 public:
     static constexpr auto name = Transform::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionCustomWeekToSomething>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCustomWeekToSomething>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionDateOrDateTimeAddInterval.h b/src/Functions/FunctionDateOrDateTimeAddInterval.h
index 95b9e25ead1..8a9d454028c 100644
--- a/src/Functions/FunctionDateOrDateTimeAddInterval.h
+++ b/src/Functions/FunctionDateOrDateTimeAddInterval.h
@@ -352,7 +352,7 @@ class FunctionDateOrDateTimeAddInterval : public IFunction
 {
 public:
     static constexpr auto name = Transform::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionDateOrDateTimeAddInterval>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionDateOrDateTimeAddInterval>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/FunctionDateOrDateTimeToSomething.h b/src/Functions/FunctionDateOrDateTimeToSomething.h
index abe859e2f29..b9d0a7f45fe 100644
--- a/src/Functions/FunctionDateOrDateTimeToSomething.h
+++ b/src/Functions/FunctionDateOrDateTimeToSomething.h
@@ -24,7 +24,7 @@ class FunctionDateOrDateTimeToSomething : public IFunction
 {
 public:
     static constexpr auto name = Transform::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionDateOrDateTimeToSomething>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionDateOrDateTimeToSomething>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/FunctionFQDN.cpp b/src/Functions/FunctionFQDN.cpp
index 7b3b89eb511..9cad9011cd4 100644
--- a/src/Functions/FunctionFQDN.cpp
+++ b/src/Functions/FunctionFQDN.cpp
@@ -12,7 +12,7 @@ class FunctionFQDN : public IFunction
 {
 public:
     static constexpr auto name = "FQDN";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionFQDN>();
     }
diff --git a/src/Functions/FunctionFactory.cpp b/src/Functions/FunctionFactory.cpp
index e13f310de09..35ac9ab647b 100644
--- a/src/Functions/FunctionFactory.cpp
+++ b/src/Functions/FunctionFactory.cpp
@@ -52,7 +52,7 @@ void FunctionFactory::registerFunction(const
 
 FunctionOverloadResolverImplPtr FunctionFactory::getImpl(
     const std::string & name,
-    const Context & context) const
+    ContextPtr context) const
 {
     auto res = tryGetImpl(name, context);
     if (!res)
@@ -82,14 +82,14 @@ std::vector<std::string> FunctionFactory::getAllNames() const
 
 FunctionOverloadResolverPtr FunctionFactory::get(
     const std::string & name,
-    const Context & context) const
+    ContextPtr context) const
 {
     return std::make_shared<FunctionOverloadResolverAdaptor>(getImpl(name, context));
 }
 
 FunctionOverloadResolverImplPtr FunctionFactory::tryGetImpl(
     const std::string & name_param,
-    const Context & context) const
+    ContextPtr context) const
 {
     String name = getAliasToOrName(name_param);
     FunctionOverloadResolverImplPtr res;
@@ -110,7 +110,7 @@ FunctionOverloadResolverImplPtr FunctionFactory::tryGetImpl(
 
     if (CurrentThread::isInitialized())
     {
-        const auto * query_context = CurrentThread::get().getQueryContext();
+        auto query_context = CurrentThread::get().getQueryContext();
         if (query_context && query_context->getSettingsRef().log_queries)
             query_context->addQueryFactoriesInfo(Context::QueryLogFactories::Function, name);
     }
@@ -120,7 +120,7 @@ FunctionOverloadResolverImplPtr FunctionFactory::tryGetImpl(
 
 FunctionOverloadResolverPtr FunctionFactory::tryGet(
         const std::string & name,
-        const Context & context) const
+        ContextPtr context) const
 {
     auto impl = tryGetImpl(name, context);
     return impl ? std::make_shared<FunctionOverloadResolverAdaptor>(std::move(impl))
diff --git a/src/Functions/FunctionFactory.h b/src/Functions/FunctionFactory.h
index 7990e78daf8..96238a88420 100644
--- a/src/Functions/FunctionFactory.h
+++ b/src/Functions/FunctionFactory.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Functions/IFunctionAdaptors.h>
+#include <Interpreters/Context_fwd.h>
 #include <Common/IFactoryWithAliases.h>
 
 #include <functional>
@@ -12,14 +13,12 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Creates function by name.
   * Function could use for initialization (take ownership of shared_ptr, for example)
   *  some dictionaries from Context.
   */
-class FunctionFactory : private boost::noncopyable, public IFactoryWithAliases<std::function<FunctionOverloadResolverImplPtr(const Context &)>>
+class FunctionFactory : private boost::noncopyable,
+                        public IFactoryWithAliases<std::function<FunctionOverloadResolverImplPtr(ContextPtr)>>
 {
 public:
     static FunctionFactory & instance();
@@ -43,14 +42,14 @@ public:
     std::vector<std::string> getAllNames() const;
 
     /// Throws an exception if not found.
-    FunctionOverloadResolverPtr get(const std::string & name, const Context & context) const;
+    FunctionOverloadResolverPtr get(const std::string & name, ContextPtr context) const;
 
     /// Returns nullptr if not found.
-    FunctionOverloadResolverPtr tryGet(const std::string & name, const Context & context) const;
+    FunctionOverloadResolverPtr tryGet(const std::string & name, ContextPtr context) const;
 
     /// The same methods to get developer interface implementation.
-    FunctionOverloadResolverImplPtr getImpl(const std::string & name, const Context & context) const;
-    FunctionOverloadResolverImplPtr tryGetImpl(const std::string & name, const Context & context) const;
+    FunctionOverloadResolverImplPtr getImpl(const std::string & name, ContextPtr context) const;
+    FunctionOverloadResolverImplPtr tryGetImpl(const std::string & name, ContextPtr context) const;
 
 private:
     using Functions = std::unordered_map<std::string, Value>;
@@ -59,7 +58,7 @@ private:
     Functions case_insensitive_functions;
 
     template <typename Function>
-    static FunctionOverloadResolverImplPtr createDefaultFunction(const Context & context)
+    static FunctionOverloadResolverImplPtr createDefaultFunction(ContextPtr context)
     {
         return std::make_unique<DefaultOverloadResolver>(Function::create(context));
     }
diff --git a/src/Functions/FunctionFile.cpp b/src/Functions/FunctionFile.cpp
index f477f6123c3..9247152367b 100644
--- a/src/Functions/FunctionFile.cpp
+++ b/src/Functions/FunctionFile.cpp
@@ -21,12 +21,12 @@ namespace ErrorCodes
 }
 
 /// A function to read file as a string.
-class FunctionFile : public IFunction
+class FunctionFile : public IFunction, WithContext
 {
 public:
     static constexpr auto name = "file";
-    static FunctionPtr create(const Context &context) { return std::make_shared<FunctionFile>(context); }
-    explicit FunctionFile(const Context &context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context_) { return std::make_shared<FunctionFile>(context_); }
+    explicit FunctionFile(ContextPtr context_) : WithContext(context_) {}
 
     String getName() const override { return name; }
 
@@ -68,7 +68,7 @@ public:
         {
             const char * filename = reinterpret_cast<const char *>(&chars[source_offset]);
 
-            const String user_files_path = context.getUserFilesPath();
+            const String user_files_path = getContext()->getUserFilesPath();
             String user_files_absolute_path = Poco::Path(user_files_path).makeAbsolute().makeDirectory().toString();
             Poco::Path poco_filepath = Poco::Path(filename);
             if (poco_filepath.isRelative())
@@ -113,7 +113,7 @@ private:
     void checkReadIsAllowedOrThrow(const std::string & user_files_absolute_path, const std::string & file_absolute_path) const
     {
         // If run in Local mode, no need for path checking.
-        if (context.getApplicationType() != Context::ApplicationType::LOCAL)
+        if (getContext()->getApplicationType() != Context::ApplicationType::LOCAL)
             if (file_absolute_path.find(user_files_absolute_path) != 0)
                 throw Exception("File is not inside " + user_files_absolute_path, ErrorCodes::DATABASE_ACCESS_DENIED);
 
@@ -121,8 +121,6 @@ private:
         if (path_poco_file.exists() && path_poco_file.isDirectory())
             throw Exception("File can't be a directory", ErrorCodes::INCORRECT_FILE_NAME);
     }
-
-    const Context & context;
 };
 
 
diff --git a/src/Functions/FunctionJoinGet.cpp b/src/Functions/FunctionJoinGet.cpp
index 49f155c687b..2ad9985d44c 100644
--- a/src/Functions/FunctionJoinGet.cpp
+++ b/src/Functions/FunctionJoinGet.cpp
@@ -36,7 +36,7 @@ ExecutableFunctionImplPtr FunctionJoinGet<or_null>::prepare(const ColumnsWithTyp
 }
 
 static std::pair<std::shared_ptr<StorageJoin>, String>
-getJoin(const ColumnsWithTypeAndName & arguments, const Context & context)
+getJoin(const ColumnsWithTypeAndName & arguments, ContextPtr context)
 {
     String join_name;
     if (const auto * name_col = checkAndGetColumnConst<ColumnString>(arguments[0].column.get()))
@@ -52,7 +52,7 @@ getJoin(const ColumnsWithTypeAndName & arguments, const Context & context)
     String database_name;
     if (dot == String::npos)
     {
-        database_name = context.getCurrentDatabase();
+        database_name = context->getCurrentDatabase();
         dot = 0;
     }
     else
@@ -88,12 +88,12 @@ FunctionBaseImplPtr JoinGetOverloadResolver<or_null>::build(const ColumnsWithTyp
             "Number of arguments for function " + getName() + " doesn't match: passed " + toString(arguments.size())
                 + ", should be greater or equal to 3",
             ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
-    auto [storage_join, attr_name] = getJoin(arguments, context);
+    auto [storage_join, attr_name] = getJoin(arguments, getContext());
     DataTypes data_types(arguments.size() - 2);
     for (size_t i = 2; i < arguments.size(); ++i)
         data_types[i - 2] = arguments[i].type;
     auto return_type = storage_join->joinGetCheckAndGetReturnType(data_types, attr_name, or_null);
-    auto table_lock = storage_join->lockForShare(context.getInitialQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto table_lock = storage_join->lockForShare(getContext()->getInitialQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
     return std::make_unique<FunctionJoinGet<or_null>>(table_lock, storage_join, attr_name, data_types, return_type);
 }
 
diff --git a/src/Functions/FunctionJoinGet.h b/src/Functions/FunctionJoinGet.h
index f88b58e961a..016ef15f2d5 100644
--- a/src/Functions/FunctionJoinGet.h
+++ b/src/Functions/FunctionJoinGet.h
@@ -1,5 +1,7 @@
 #pragma once
+
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 #include <Storages/IStorage_fwd.h>
 #include <Storages/TableLockHolder.h>
 #include <Core/Block.h>
@@ -7,7 +9,6 @@
 namespace DB
 {
 
-class Context;
 class HashJoin;
 class StorageJoin;
 using StorageJoinPtr = std::shared_ptr<StorageJoin>;
@@ -73,13 +74,13 @@ private:
 };
 
 template <bool or_null>
-class JoinGetOverloadResolver final : public IFunctionOverloadResolverImpl
+class JoinGetOverloadResolver final : public IFunctionOverloadResolverImpl, WithContext
 {
 public:
     static constexpr auto name = or_null ? "joinGetOrNull" : "joinGet";
-    static FunctionOverloadResolverImplPtr create(const Context & context) { return std::make_unique<JoinGetOverloadResolver>(context); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr context_) { return std::make_unique<JoinGetOverloadResolver>(context_); }
 
-    explicit JoinGetOverloadResolver(const Context & context_) : context(context_) {}
+    explicit JoinGetOverloadResolver(ContextPtr context_) : WithContext(context_) {}
 
     String getName() const override { return name; }
 
@@ -92,9 +93,6 @@ public:
     bool isVariadic() const override { return true; }
     size_t getNumberOfArguments() const override { return 0; }
     ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0, 1}; }
-
-private:
-    const Context & context;
 };
 
 }
diff --git a/src/Functions/FunctionMathBinaryFloat64.h b/src/Functions/FunctionMathBinaryFloat64.h
index 0a0688dc75c..00f6909f65c 100644
--- a/src/Functions/FunctionMathBinaryFloat64.h
+++ b/src/Functions/FunctionMathBinaryFloat64.h
@@ -28,7 +28,7 @@ class FunctionMathBinaryFloat64 : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMathBinaryFloat64>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMathBinaryFloat64>(); }
     static_assert(Impl::rows_per_iteration > 0, "Impl must process at least one row per iteration");
 
     bool useDefaultImplementationForConstants() const override { return true; }
diff --git a/src/Functions/FunctionMathConstFloat64.h b/src/Functions/FunctionMathConstFloat64.h
index f03f469bc35..04ade5b4637 100644
--- a/src/Functions/FunctionMathConstFloat64.h
+++ b/src/Functions/FunctionMathConstFloat64.h
@@ -13,7 +13,7 @@ class FunctionMathConstFloat64 : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMathConstFloat64>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMathConstFloat64>(); }
 
 private:
     String getName() const override { return name; }
diff --git a/src/Functions/FunctionMathUnary.h b/src/Functions/FunctionMathUnary.h
index 49b0428811a..e24d19e5a9b 100644
--- a/src/Functions/FunctionMathUnary.h
+++ b/src/Functions/FunctionMathUnary.h
@@ -35,7 +35,7 @@ class FunctionMathUnary : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMathUnary>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMathUnary>(); }
 
 private:
     String getName() const override { return name; }
diff --git a/src/Functions/FunctionNumericPredicate.h b/src/Functions/FunctionNumericPredicate.h
index 72a17adac4c..9bb0f700fe0 100644
--- a/src/Functions/FunctionNumericPredicate.h
+++ b/src/Functions/FunctionNumericPredicate.h
@@ -1,8 +1,10 @@
 #pragma once
+
 #include <Functions/IFunctionImpl.h>
 #include <Functions/FunctionHelpers.h>
 #include <DataTypes/DataTypesNumber.h>
 #include <Columns/ColumnsNumber.h>
+#include <Interpreters/Context_fwd.h>
 #include <ext/range.h>
 
 
@@ -21,7 +23,7 @@ class FunctionNumericPredicate : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionNumericPredicate>();
     }
diff --git a/src/Functions/FunctionStartsEndsWith.h b/src/Functions/FunctionStartsEndsWith.h
index 2899bc259d5..87c07c5efd2 100644
--- a/src/Functions/FunctionStartsEndsWith.h
+++ b/src/Functions/FunctionStartsEndsWith.h
@@ -142,7 +142,7 @@ template <typename Name>
 class FunctionStartsEndsWith : public TargetSpecific::Default::FunctionStartsEndsWith<Name>
 {
 public:
-    explicit FunctionStartsEndsWith(const Context & context) : selector(context)
+    explicit FunctionStartsEndsWith(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             TargetSpecific::Default::FunctionStartsEndsWith<Name>>();
@@ -164,7 +164,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionStartsEndsWith<Name>>(context);
     }
diff --git a/src/Functions/FunctionStringOrArrayToT.h b/src/Functions/FunctionStringOrArrayToT.h
index e00acc006cf..40ce62a5666 100644
--- a/src/Functions/FunctionStringOrArrayToT.h
+++ b/src/Functions/FunctionStringOrArrayToT.h
@@ -25,7 +25,7 @@ class FunctionStringOrArrayToT : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionStringOrArrayToT>();
     }
diff --git a/src/Functions/FunctionStringReplace.h b/src/Functions/FunctionStringReplace.h
index bd8edbf9202..2e99f58531a 100644
--- a/src/Functions/FunctionStringReplace.h
+++ b/src/Functions/FunctionStringReplace.h
@@ -23,7 +23,7 @@ class FunctionStringReplace : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionStringReplace>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringReplace>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionStringToString.h b/src/Functions/FunctionStringToString.h
index 4123b41c547..36009dc30c0 100644
--- a/src/Functions/FunctionStringToString.h
+++ b/src/Functions/FunctionStringToString.h
@@ -1,9 +1,11 @@
 #pragma once
+
 #include <DataTypes/DataTypeString.h>
 #include <Columns/ColumnString.h>
 #include <Columns/ColumnFixedString.h>
 #include <Functions/FunctionHelpers.h>
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
@@ -21,7 +23,7 @@ class FunctionStringToString : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionStringToString>();
     }
diff --git a/src/Functions/FunctionUnaryArithmetic.h b/src/Functions/FunctionUnaryArithmetic.h
index 06469a83e3e..9145c4a2ec5 100644
--- a/src/Functions/FunctionUnaryArithmetic.h
+++ b/src/Functions/FunctionUnaryArithmetic.h
@@ -110,7 +110,7 @@ class FunctionUnaryArithmetic : public IFunction
 
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionUnaryArithmetic>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionUnaryArithmetic>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/FunctionUnixTimestamp64.h b/src/Functions/FunctionUnixTimestamp64.h
index 20e225990bd..18f9c7a8b02 100644
--- a/src/Functions/FunctionUnixTimestamp64.h
+++ b/src/Functions/FunctionUnixTimestamp64.h
@@ -33,7 +33,7 @@ public:
 
     static_assert(std::is_same_v<SourceDataType, DataTypeDateTime64> || std::is_same_v<ResultDataType, DataTypeDateTime64>);
 
-    static auto create(const Context &)
+    static auto create(ContextPtr)
     {
         return std::make_shared<FunctionUnixTimestamp64<Impl>>();
     }
diff --git a/src/Functions/FunctionsAES.h b/src/Functions/FunctionsAES.h
index 8af4a27ecc9..b76b454fd77 100644
--- a/src/Functions/FunctionsAES.h
+++ b/src/Functions/FunctionsAES.h
@@ -141,7 +141,7 @@ class FunctionEncrypt : public IFunction
 public:
     static constexpr OpenSSLDetails::CompatibilityMode compatibility_mode = Impl::compatibility_mode;
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionEncrypt>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionEncrypt>(); }
 
 private:
     using CipherMode = OpenSSLDetails::CipherMode;
@@ -416,7 +416,7 @@ class FunctionDecrypt : public IFunction
 public:
     static constexpr OpenSSLDetails::CompatibilityMode compatibility_mode = Impl::compatibility_mode;
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionDecrypt>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionDecrypt>(); }
 
 private:
     using CipherMode = OpenSSLDetails::CipherMode;
diff --git a/src/Functions/FunctionsBitmap.h b/src/Functions/FunctionsBitmap.h
index a79365ec16c..aa4a6b50ea3 100644
--- a/src/Functions/FunctionsBitmap.h
+++ b/src/Functions/FunctionsBitmap.h
@@ -93,7 +93,7 @@ class FunctionBitmapBuildImpl : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapBuildImpl>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapBuildImpl>(); }
 
     String getName() const override { return name; }
 
@@ -221,7 +221,7 @@ class FunctionBitmapToArrayImpl : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapToArrayImpl>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapToArrayImpl>(); }
 
     String getName() const override { return name; }
 
@@ -311,7 +311,7 @@ class FunctionBitmapSubset : public IFunction
 public:
     static constexpr auto name = Impl::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapSubset<Impl>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapSubset<Impl>>(); }
 
     String getName() const override { return name; }
 
@@ -469,7 +469,7 @@ class FunctionBitmapTransform : public IFunction
 public:
     static constexpr auto name = "bitmapTransform";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapTransform>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapTransform>(); }
 
     String getName() const override { return name; }
 
@@ -635,7 +635,7 @@ class FunctionBitmapSelfCardinalityImpl : public IFunction
 public:
     static constexpr auto name = Impl::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapSelfCardinalityImpl<Impl>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapSelfCardinalityImpl<Impl>>(); }
 
     String getName() const override { return name; }
 
@@ -807,7 +807,7 @@ class FunctionBitmapContains : public IFunction
 public:
     static constexpr auto name = "bitmapContains";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapContains>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapContains>(); }
 
     String getName() const override { return name; }
 
@@ -911,7 +911,7 @@ class FunctionBitmapCardinality : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmapCardinality>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmapCardinality>(); }
 
     String getName() const override { return name; }
 
@@ -1054,7 +1054,7 @@ class FunctionBitmap : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmap>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmap>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsCoding.h b/src/Functions/FunctionsCoding.h
index ee15561f133..933d4f01b92 100644
--- a/src/Functions/FunctionsCoding.h
+++ b/src/Functions/FunctionsCoding.h
@@ -1,28 +1,29 @@
 #pragma once
 
-#include <Common/formatIPv6.h>
-#include <Common/hex.h>
-#include <Common/IPv6ToBinary.h>
-#include <Common/typeid_cast.h>
-#include <IO/WriteHelpers.h>
-#include <DataTypes/DataTypeFactory.h>
-#include <DataTypes/DataTypesNumber.h>
-#include <DataTypes/DataTypeString.h>
-#include <DataTypes/DataTypeFixedString.h>
+#include <Columns/ColumnArray.h>
+#include <Columns/ColumnConst.h>
+#include <Columns/ColumnDecimal.h>
+#include <Columns/ColumnFixedString.h>
+#include <Columns/ColumnString.h>
+#include <Columns/ColumnTuple.h>
+#include <Columns/ColumnsNumber.h>
 #include <DataTypes/DataTypeArray.h>
 #include <DataTypes/DataTypeDate.h>
 #include <DataTypes/DataTypeDateTime.h>
-#include <DataTypes/DataTypeUUID.h>
+#include <DataTypes/DataTypeFactory.h>
+#include <DataTypes/DataTypeFixedString.h>
+#include <DataTypes/DataTypeString.h>
 #include <DataTypes/DataTypeTuple.h>
-#include <Columns/ColumnsNumber.h>
-#include <Columns/ColumnString.h>
-#include <Columns/ColumnFixedString.h>
-#include <Columns/ColumnArray.h>
-#include <Columns/ColumnConst.h>
-#include <Columns/ColumnTuple.h>
-#include <Columns/ColumnDecimal.h>
-#include <Functions/IFunctionImpl.h>
+#include <DataTypes/DataTypeUUID.h>
+#include <DataTypes/DataTypesNumber.h>
 #include <Functions/FunctionHelpers.h>
+#include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
+#include <IO/WriteHelpers.h>
+#include <Common/IPv6ToBinary.h>
+#include <Common/formatIPv6.h>
+#include <Common/hex.h>
+#include <Common/typeid_cast.h>
 
 #include <arpa/inet.h>
 #include <ext/range.h>
@@ -68,7 +69,7 @@ class FunctionIPv6NumToString : public IFunction
 {
 public:
     static constexpr auto name = "IPv6NumToString";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv6NumToString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv6NumToString>(); }
 
     String getName() const override { return name; }
 
@@ -138,7 +139,7 @@ class FunctionCutIPv6 : public IFunction
 {
 public:
     static constexpr auto name = "cutIPv6";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionCutIPv6>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCutIPv6>(); }
 
     String getName() const override { return name; }
 
@@ -261,7 +262,7 @@ class FunctionIPv6StringToNum : public IFunction
 {
 public:
     static constexpr auto name = "IPv6StringToNum";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv6StringToNum>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv6StringToNum>(); }
 
     static inline bool tryParseIPv4(const char * pos)
     {
@@ -339,7 +340,7 @@ class FunctionIPv4NumToString : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv4NumToString<mask_tail_octets, Name>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv4NumToString<mask_tail_octets, Name>>(); }
 
     String getName() const override
     {
@@ -400,7 +401,7 @@ class FunctionIPv4StringToNum : public IFunction
 {
 public:
     static constexpr auto name = "IPv4StringToNum";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv4StringToNum>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv4StringToNum>(); }
 
     String getName() const override
     {
@@ -463,7 +464,7 @@ class FunctionIPv4ToIPv6 : public IFunction
 {
 public:
      static constexpr auto name = "IPv4ToIPv6";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv4ToIPv6>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv4ToIPv6>(); }
 
     String getName() const override { return name; }
 
@@ -518,7 +519,7 @@ class FunctionToIPv4 : public FunctionIPv4StringToNum
 {
 public:
     static constexpr auto name = "toIPv4";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToIPv4>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToIPv4>(); }
 
     String getName() const override
     {
@@ -541,7 +542,7 @@ class FunctionToIPv6 : public FunctionIPv6StringToNum
 {
 public:
     static constexpr auto name = "toIPv6";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToIPv6>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToIPv6>(); }
 
     String getName() const override { return name; }
 
@@ -559,7 +560,7 @@ class FunctionMACNumToString : public IFunction
 {
 public:
     static constexpr auto name = "MACNumToString";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMACNumToString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMACNumToString>(); }
 
     String getName() const override
     {
@@ -689,7 +690,7 @@ class FunctionMACStringTo : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMACStringTo<Impl>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMACStringTo<Impl>>(); }
 
     String getName() const override
     {
@@ -752,7 +753,7 @@ class FunctionUUIDNumToString : public IFunction
 
 public:
     static constexpr auto name = "UUIDNumToString";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionUUIDNumToString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionUUIDNumToString>(); }
 
     String getName() const override
     {
@@ -850,7 +851,7 @@ private:
 
 public:
     static constexpr auto name = "UUIDStringToNum";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionUUIDStringToNum>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionUUIDStringToNum>(); }
 
     String getName() const override
     {
@@ -954,7 +955,7 @@ class FunctionHex : public IFunction
 {
 public:
     static constexpr auto name = "hex";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionHex>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionHex>(); }
 
     String getName() const override
     {
@@ -1237,7 +1238,7 @@ class FunctionUnhex : public IFunction
 {
 public:
     static constexpr auto name = "unhex";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionUnhex>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionUnhex>(); }
 
     String getName() const override
     {
@@ -1326,7 +1327,7 @@ class FunctionChar : public IFunction
 {
 public:
     static constexpr auto name = "char";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionChar>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionChar>(); }
 
     String getName() const override
     {
@@ -1421,7 +1422,7 @@ class FunctionBitmaskToArray : public IFunction
 {
 public:
     static constexpr auto name = "bitmaskToArray";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmaskToArray>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmaskToArray>(); }
 
     String getName() const override
     {
@@ -1507,7 +1508,7 @@ class FunctionToStringCutToZero : public IFunction
 {
 public:
     static constexpr auto name = "toStringCutToZero";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToStringCutToZero>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToStringCutToZero>(); }
 
     String getName() const override
     {
@@ -1672,7 +1673,7 @@ private:
 
 public:
     static constexpr auto name = "IPv6CIDRToRange";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv6CIDRToRange>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv6CIDRToRange>(); }
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
@@ -1786,7 +1787,7 @@ private:
 
 public:
     static constexpr auto name = "IPv4CIDRToRange";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIPv4CIDRToRange>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIPv4CIDRToRange>(); }
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
@@ -1867,7 +1868,7 @@ class FunctionIsIPv4String : public FunctionIPv4StringToNum
 public:
     static constexpr auto name = "isIPv4String";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIsIPv4String>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIsIPv4String>(); }
 
     String getName() const override { return name; }
 
@@ -1913,7 +1914,7 @@ class FunctionIsIPv6String : public FunctionIPv6StringToNum
 public:
     static constexpr auto name = "isIPv6String";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIsIPv6String>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIsIPv6String>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsComparison.h b/src/Functions/FunctionsComparison.h
index bbfa1ea20d8..025b7c67b21 100644
--- a/src/Functions/FunctionsComparison.h
+++ b/src/Functions/FunctionsComparison.h
@@ -552,22 +552,18 @@ struct NameLessOrEquals    { static constexpr auto name = "lessOrEquals"; };
 struct NameGreaterOrEquals { static constexpr auto name = "greaterOrEquals"; };
 
 
-template <
-    template <typename, typename> class Op,
-    typename Name>
+template <template <typename, typename> class Op, typename Name>
 class FunctionComparison : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionComparison>(context); }
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionComparison>(context); }
 
-    explicit FunctionComparison(const Context & context_)
-    :   context(context_),
-        check_decimal_overflow(decimalCheckComparisonOverflow(context))
-    {}
+    explicit FunctionComparison(ContextPtr context_)
+        : context(context_), check_decimal_overflow(decimalCheckComparisonOverflow(context)) {}
 
 private:
-    const Context & context;
+    ContextPtr context;
     bool check_decimal_overflow = true;
 
     template <typename T0, typename T1>
diff --git a/src/Functions/FunctionsConsistentHashing.h b/src/Functions/FunctionsConsistentHashing.h
index faf66579fc4..17432cd7e78 100644
--- a/src/Functions/FunctionsConsistentHashing.h
+++ b/src/Functions/FunctionsConsistentHashing.h
@@ -6,6 +6,7 @@
 #include <Functions/FunctionHelpers.h>
 #include <Functions/IFunctionImpl.h>
 #include <Common/typeid_cast.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
@@ -23,7 +24,7 @@ class FunctionConsistentHashImpl : public IFunction
 public:
     static constexpr auto name = Impl::name;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionConsistentHashImpl<Impl>>();
     }
diff --git a/src/Functions/FunctionsConversion.h b/src/Functions/FunctionsConversion.h
index c732ce5f931..9b40be58862 100644
--- a/src/Functions/FunctionsConversion.h
+++ b/src/Functions/FunctionsConversion.h
@@ -1290,7 +1290,7 @@ public:
     static constexpr bool to_string_or_fixed_string = std::is_same_v<ToDataType, DataTypeFixedString> ||
                                                       std::is_same_v<ToDataType, DataTypeString>;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionConvert>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionConvert>(); }
     static FunctionPtr create() { return std::make_shared<FunctionConvert>(); }
 
     String getName() const override
@@ -1586,7 +1586,7 @@ public:
 
     static constexpr bool to_datetime64 = std::is_same_v<ToDataType, DataTypeDateTime64>;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionConvertFromString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionConvertFromString>(); }
     static FunctionPtr create() { return std::make_shared<FunctionConvertFromString>(); }
 
     String getName() const override
@@ -2275,7 +2275,7 @@ private:
     std::optional<Diagnostic> diagnostic;
     CastType cast_type;
 
-    WrapperType createFunctionAdaptor(FunctionPtr function, const DataTypePtr & from_type) const
+    static WrapperType createFunctionAdaptor(FunctionPtr function, const DataTypePtr & from_type)
     {
         auto function_adaptor = FunctionOverloadResolverAdaptor(std::make_unique<DefaultOverloadResolver>(function))
                                     .build({ColumnWithTypeAndName{nullptr, from_type, ""}});
@@ -2367,7 +2367,7 @@ private:
         };
     }
 
-    WrapperType createStringWrapper(const DataTypePtr & from_type) const
+    static WrapperType createStringWrapper(const DataTypePtr & from_type)
     {
         FunctionPtr function = FunctionToString::create();
         return createFunctionAdaptor(function, from_type);
@@ -3125,43 +3125,43 @@ public:
 
     static MonotonicityForRange getMonotonicityInformation(const DataTypePtr & from_type, const IDataType * to_type)
     {
-        if (const auto type = checkAndGetDataType<DataTypeUInt8>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeUInt8>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeUInt16>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeUInt16>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeUInt32>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeUInt32>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeUInt64>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeUInt64>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeUInt256>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeUInt256>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt8>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt8>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt16>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt16>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt32>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt32>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt64>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt64>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt128>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt128>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeInt256>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeInt256>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeFloat32>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeFloat32>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeFloat64>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeFloat64>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeDate>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeDate>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeDateTime>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeDateTime>(to_type))
             return monotonicityForType(type);
-        if (const auto type = checkAndGetDataType<DataTypeString>(to_type))
+        if (const auto *const type = checkAndGetDataType<DataTypeString>(to_type))
             return monotonicityForType(type);
         if (isEnum(from_type))
         {
-            if (const auto type = checkAndGetDataType<DataTypeEnum8>(to_type))
+            if (const auto *const type = checkAndGetDataType<DataTypeEnum8>(to_type))
                 return monotonicityForType(type);
-            if (const auto type = checkAndGetDataType<DataTypeEnum16>(to_type))
+            if (const auto *const type = checkAndGetDataType<DataTypeEnum16>(to_type))
                 return monotonicityForType(type);
         }
         /// other types like Null, FixedString, Array and Tuple have no monotonicity defined
@@ -3184,9 +3184,9 @@ public:
         ? accurate_cast_name
         : (cast_type == CastType::accurateOrNull ? accurate_cast_or_null_name : cast_name);
 
-    static FunctionOverloadResolverImplPtr create(const Context & context)
+    static FunctionOverloadResolverImplPtr create(ContextPtr context)
     {
-        return createImpl(context.getSettingsRef().cast_keep_nullable);
+        return createImpl(context->getSettingsRef().cast_keep_nullable);
     }
 
     static FunctionOverloadResolverImplPtr createImpl(bool keep_nullable, std::optional<Diagnostic> diagnostic = {})
diff --git a/src/Functions/FunctionsEmbeddedDictionaries.h b/src/Functions/FunctionsEmbeddedDictionaries.h
index 01456365740..7584a217a26 100644
--- a/src/Functions/FunctionsEmbeddedDictionaries.h
+++ b/src/Functions/FunctionsEmbeddedDictionaries.h
@@ -483,81 +483,81 @@ struct NameRegionIn                    { static constexpr auto name = "regionIn"
 struct FunctionRegionToCity :
     public FunctionTransformWithDictionary<UInt32, RegionToCityImpl,    RegionsHierarchyGetter,    NameRegionToCity>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToArea :
     public FunctionTransformWithDictionary<UInt32, RegionToAreaImpl,    RegionsHierarchyGetter,    NameRegionToArea>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToDistrict :
     public FunctionTransformWithDictionary<UInt32, RegionToDistrictImpl, RegionsHierarchyGetter, NameRegionToDistrict>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToCountry :
     public FunctionTransformWithDictionary<UInt32, RegionToCountryImpl, RegionsHierarchyGetter, NameRegionToCountry>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToContinent :
     public FunctionTransformWithDictionary<UInt32, RegionToContinentImpl, RegionsHierarchyGetter, NameRegionToContinent>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToTopContinent :
     public FunctionTransformWithDictionary<UInt32, RegionToTopContinentImpl, RegionsHierarchyGetter, NameRegionToTopContinent>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionToPopulation :
     public FunctionTransformWithDictionary<UInt32, RegionToPopulationImpl, RegionsHierarchyGetter, NameRegionToPopulation>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionIn :
     public FunctionIsInWithDictionary<UInt32, RegionInImpl, RegionsHierarchyGetter,    NameRegionIn>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
 struct FunctionRegionHierarchy :
     public FunctionHierarchyWithDictionary<UInt32, RegionHierarchyImpl, RegionsHierarchyGetter, NameRegionHierarchy>
 {
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<base_type>(context.getEmbeddedDictionaries().getRegionsHierarchies());
+        return std::make_shared<base_type>(context->getEmbeddedDictionaries().getRegionsHierarchies());
     }
 };
 
@@ -567,9 +567,9 @@ class FunctionRegionToName : public IFunction
 {
 public:
     static constexpr auto name = "regionToName";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionRegionToName>(context.getEmbeddedDictionaries().getRegionsNames());
+        return std::make_shared<FunctionRegionToName>(context->getEmbeddedDictionaries().getRegionsNames());
     }
 
 private:
@@ -643,9 +643,9 @@ public:
 
             const ColumnUInt32::Container & region_ids = col_from->getData();
 
-            for (size_t i = 0; i < region_ids.size(); ++i)
+            for (unsigned int region_id : region_ids)
             {
-                const StringRef & name_ref = dict.getRegionName(region_ids[i], language);
+                const StringRef & name_ref = dict.getRegionName(region_id, language);
                 col_to->insertDataWithTerminatingZero(name_ref.data, name_ref.size + 1);
             }
 
diff --git a/src/Functions/FunctionsExternalDictionaries.h b/src/Functions/FunctionsExternalDictionaries.h
index dba0e509c50..6157b532cb9 100644
--- a/src/Functions/FunctionsExternalDictionaries.h
+++ b/src/Functions/FunctionsExternalDictionaries.h
@@ -62,18 +62,18 @@ namespace ErrorCodes
   */
 
 
-class FunctionDictHelper
+class FunctionDictHelper : WithContext
 {
 public:
-    explicit FunctionDictHelper(const Context & context_) : context(context_) {}
+    explicit FunctionDictHelper(ContextPtr context_) : WithContext(context_) {}
 
     std::shared_ptr<const IDictionary> getDictionary(const String & dictionary_name)
     {
-        auto dict = context.getExternalDictionariesLoader().getDictionary(dictionary_name, context);
+        auto dict = getContext()->getExternalDictionariesLoader().getDictionary(dictionary_name, getContext());
 
         if (!access_checked)
         {
-            context.checkAccess(AccessType::dictGet, dict->getDatabaseOrNoDatabaseTag(), dict->getDictionaryID().getTableName());
+            getContext()->checkAccess(AccessType::dictGet, dict->getDatabaseOrNoDatabaseTag(), dict->getDictionaryID().getTableName());
             access_checked = true;
         }
 
@@ -112,11 +112,10 @@ public:
 
     DictionaryStructure getDictionaryStructure(const String & dictionary_name) const
     {
-        return context.getExternalDictionariesLoader().getDictionaryStructure(dictionary_name, context);
+        return getContext()->getExternalDictionariesLoader().getDictionaryStructure(dictionary_name, getContext());
     }
 
 private:
-    const Context & context;
     /// Access cannot be not granted, since in this case checkAccess() will throw and access_checked will not be updated.
     std::atomic<bool> access_checked = false;
 
@@ -133,12 +132,12 @@ class FunctionDictHas final : public IFunction
 public:
     static constexpr auto name = "dictHas";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictHas>(context);
     }
 
-    explicit FunctionDictHas(const Context & context_) : helper(context_) {}
+    explicit FunctionDictHas(ContextPtr context_) : helper(context_) {}
 
     String getName() const override { return name; }
 
@@ -271,12 +270,12 @@ class FunctionDictGetNoType final : public IFunction
 public:
     static constexpr auto name = dictionary_get_function_type == DictionaryGetFunctionType::get ? "dictGet" : "dictGetOrDefault";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetNoType>(context);
     }
 
-    explicit FunctionDictGetNoType(const Context & context_) : helper(context_) {}
+    explicit FunctionDictGetNoType(ContextPtr context_) : helper(context_) {}
 
     String getName() const override { return name; }
 
@@ -605,12 +604,12 @@ class FunctionDictGetImpl final : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetImpl>(context);
     }
 
-    explicit FunctionDictGetImpl(const Context & context_) : impl(context_) {}
+    explicit FunctionDictGetImpl(ContextPtr context_) : impl(context_) {}
 
     String getName() const override { return name; }
 
@@ -744,12 +743,12 @@ class FunctionDictGetOrNull final : public IFunction
 public:
     static constexpr auto name = "dictGetOrNull";
 
-    static FunctionPtr create(const Context &context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetOrNull>(context);
     }
 
-    explicit FunctionDictGetOrNull(const Context & context_)
+    explicit FunctionDictGetOrNull(ContextPtr context_)
         : dictionary_get_func_impl(context_)
         , dictionary_has_func_impl(context_)
     {}
@@ -904,12 +903,12 @@ class FunctionDictGetHierarchy final : public IFunction
 public:
     static constexpr auto name = "dictGetHierarchy";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetHierarchy>(context);
     }
 
-    explicit FunctionDictGetHierarchy(const Context & context_) : helper(context_) {}
+    explicit FunctionDictGetHierarchy(ContextPtr context_) : helper(context_) {}
 
     String getName() const override { return name; }
 
@@ -964,12 +963,12 @@ class FunctionDictIsIn final : public IFunction
 public:
     static constexpr auto name = "dictIsIn";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictIsIn>(context);
     }
 
-    explicit FunctionDictIsIn(const Context & context_)
+    explicit FunctionDictIsIn(ContextPtr context_)
         : helper(context_) {}
 
     String getName() const override { return name; }
@@ -1030,12 +1029,12 @@ class FunctionDictGetChildren final : public IFunction
 public:
     static constexpr auto name = "dictGetChildren";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetChildren>(context);
     }
 
-    explicit FunctionDictGetChildren(const Context & context_)
+    explicit FunctionDictGetChildren(ContextPtr context_)
         : helper(context_) {}
 
     String getName() const override { return name; }
@@ -1089,12 +1088,12 @@ class FunctionDictGetDescendants final : public IFunction
 public:
     static constexpr auto name = "dictGetDescendants";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionDictGetDescendants>(context);
     }
 
-    explicit FunctionDictGetDescendants(const Context & context_)
+    explicit FunctionDictGetDescendants(ContextPtr context_)
         : helper(context_) {}
 
     String getName() const override { return name; }
diff --git a/src/Functions/FunctionsExternalModels.cpp b/src/Functions/FunctionsExternalModels.cpp
index ecec9383252..da46f7fcb38 100644
--- a/src/Functions/FunctionsExternalModels.cpp
+++ b/src/Functions/FunctionsExternalModels.cpp
@@ -18,9 +18,9 @@
 namespace DB
 {
 
-FunctionPtr FunctionModelEvaluate::create(const Context & context)
+FunctionPtr FunctionModelEvaluate::create(ContextPtr context)
 {
-    return std::make_shared<FunctionModelEvaluate>(context.getExternalModelsLoader());
+    return std::make_shared<FunctionModelEvaluate>(context->getExternalModelsLoader());
 }
 
 namespace ErrorCodes
diff --git a/src/Functions/FunctionsExternalModels.h b/src/Functions/FunctionsExternalModels.h
index 9bb6cc5a77c..9f46e70c906 100644
--- a/src/Functions/FunctionsExternalModels.h
+++ b/src/Functions/FunctionsExternalModels.h
@@ -1,11 +1,12 @@
 #pragma once
+
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
 
 class ExternalModelsLoader;
-class Context;
 
 /// Evaluate external model.
 /// First argument - model name, the others - model arguments.
@@ -16,7 +17,7 @@ class FunctionModelEvaluate final : public IFunction
 public:
     static constexpr auto name = "modelEvaluate";
 
-    static FunctionPtr create(const Context & context);
+    static FunctionPtr create(ContextPtr context);
 
     explicit FunctionModelEvaluate(const ExternalModelsLoader & models_loader_) : models_loader(models_loader_) {}
 
diff --git a/src/Functions/FunctionsHashing.h b/src/Functions/FunctionsHashing.h
index 41152660e4f..94f8acbdf66 100644
--- a/src/Functions/FunctionsHashing.h
+++ b/src/Functions/FunctionsHashing.h
@@ -535,7 +535,7 @@ class FunctionStringHashFixedString : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionStringHashFixedString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringHashFixedString>(); }
 
     String getName() const override
     {
@@ -700,7 +700,7 @@ template <typename Impl, typename Name>
 class FunctionIntHash : public TargetSpecific::Default::FunctionIntHash<Impl, Name>
 {
 public:
-    explicit FunctionIntHash(const Context & context) : selector(context)
+    explicit FunctionIntHash(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             TargetSpecific::Default::FunctionIntHash<Impl, Name>>();
@@ -718,7 +718,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionIntHash>(context);
     }
@@ -1076,7 +1076,7 @@ template <typename Impl>
 class FunctionAnyHash : public TargetSpecific::Default::FunctionAnyHash<Impl>
 {
 public:
-    explicit FunctionAnyHash(const Context & context) : selector(context)
+    explicit FunctionAnyHash(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             TargetSpecific::Default::FunctionAnyHash<Impl>>();
@@ -1094,7 +1094,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionAnyHash>(context);
     }
@@ -1181,7 +1181,7 @@ class FunctionURLHash : public IFunction
 {
 public:
     static constexpr auto name = "URLHash";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionURLHash>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionURLHash>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsJSON.h b/src/Functions/FunctionsJSON.h
index f066bb1029a..c2fd44e2e2a 100644
--- a/src/Functions/FunctionsJSON.h
+++ b/src/Functions/FunctionsJSON.h
@@ -270,11 +270,11 @@ private:
 
 
 template <typename Name, template<typename> typename Impl>
-class FunctionJSON : public IFunction
+class FunctionJSON : public IFunction, WithContext
 {
 public:
-    static FunctionPtr create(const Context & context_) { return std::make_shared<FunctionJSON>(context_); }
-    FunctionJSON(const Context & context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context_) { return std::make_shared<FunctionJSON>(context_); }
+    FunctionJSON(ContextPtr context_) : WithContext(context_) {}
 
     static constexpr auto name = Name::name;
     String getName() const override { return Name::name; }
@@ -291,7 +291,7 @@ public:
     {
         /// Choose JSONParser.
 #if USE_SIMDJSON
-        if (context.getSettingsRef().allow_simdjson)
+        if (getContext()->getSettingsRef().allow_simdjson)
             return FunctionJSONHelpers::Executor<Name, Impl, SimdJSONParser>::run(arguments, result_type, input_rows_count);
 #endif
 
@@ -301,9 +301,6 @@ public:
         return FunctionJSONHelpers::Executor<Name, Impl, DummyJSONParser>::run(arguments, result_type, input_rows_count);
 #endif
     }
-
-private:
-    const Context & context;
 };
 
 
@@ -613,8 +610,8 @@ struct JSONExtractTree
     class Node
     {
     public:
-        Node() {}
-        virtual ~Node() {}
+        Node() = default;
+        virtual ~Node() = default;
         virtual bool insertResultToColumn(IColumn &, const Element &) = 0;
     };
 
diff --git a/src/Functions/FunctionsLogical.h b/src/Functions/FunctionsLogical.h
index a5579ebdf8a..12733348762 100644
--- a/src/Functions/FunctionsLogical.h
+++ b/src/Functions/FunctionsLogical.h
@@ -138,7 +138,7 @@ class FunctionAnyArityLogical : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionAnyArityLogical>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionAnyArityLogical>(); }
 
 public:
     String getName() const override
@@ -203,7 +203,7 @@ class FunctionUnaryLogical : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionUnaryLogical>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionUnaryLogical>(); }
 
 public:
     String getName() const override
diff --git a/src/Functions/FunctionsMultiStringFuzzySearch.h b/src/Functions/FunctionsMultiStringFuzzySearch.h
index 551c6e97495..90b5bc72744 100644
--- a/src/Functions/FunctionsMultiStringFuzzySearch.h
+++ b/src/Functions/FunctionsMultiStringFuzzySearch.h
@@ -34,9 +34,9 @@ class FunctionsMultiStringFuzzySearch : public IFunction
 
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        if (Impl::is_using_hyperscan && !context.getSettingsRef().allow_hyperscan)
+        if (Impl::is_using_hyperscan && !context->getSettingsRef().allow_hyperscan)
             throw Exception(
                 "Hyperscan functions are disabled, because setting 'allow_hyperscan' is set to 0", ErrorCodes::FUNCTION_NOT_ALLOWED);
 
diff --git a/src/Functions/FunctionsMultiStringPosition.h b/src/Functions/FunctionsMultiStringPosition.h
index 2c0f2ae8f7b..b137d2d0c80 100644
--- a/src/Functions/FunctionsMultiStringPosition.h
+++ b/src/Functions/FunctionsMultiStringPosition.h
@@ -51,7 +51,7 @@ class FunctionsMultiStringPosition : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionsMultiStringPosition>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsMultiStringPosition>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsMultiStringSearch.h b/src/Functions/FunctionsMultiStringSearch.h
index f1185c2d850..e39ee5f816e 100644
--- a/src/Functions/FunctionsMultiStringSearch.h
+++ b/src/Functions/FunctionsMultiStringSearch.h
@@ -47,9 +47,9 @@ class FunctionsMultiStringSearch : public IFunction
 
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        if (Impl::is_using_hyperscan && !context.getSettingsRef().allow_hyperscan)
+        if (Impl::is_using_hyperscan && !context->getSettingsRef().allow_hyperscan)
             throw Exception(
                 "Hyperscan functions are disabled, because setting 'allow_hyperscan' is set to 0", ErrorCodes::FUNCTION_NOT_ALLOWED);
 
diff --git a/src/Functions/FunctionsRandom.h b/src/Functions/FunctionsRandom.h
index f7b0ac8c2e0..c933f70e9b3 100644
--- a/src/Functions/FunctionsRandom.h
+++ b/src/Functions/FunctionsRandom.h
@@ -91,7 +91,7 @@ template <typename ToType, typename Name>
 class FunctionRandom : public FunctionRandomImpl<TargetSpecific::Default::RandImpl, ToType, Name>
 {
 public:
-    explicit FunctionRandom(const Context & context) : selector(context)
+    explicit FunctionRandom(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             FunctionRandomImpl<TargetSpecific::Default::RandImpl, ToType, Name>>();
@@ -107,7 +107,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionRandom<ToType, Name>>(context);
     }
diff --git a/src/Functions/FunctionsRound.h b/src/Functions/FunctionsRound.h
index b190bc5bd8b..01074984ebf 100644
--- a/src/Functions/FunctionsRound.h
+++ b/src/Functions/FunctionsRound.h
@@ -526,7 +526,7 @@ class FunctionRounding : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRounding>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRounding>(); }
 
     String getName() const override
     {
@@ -635,7 +635,7 @@ class FunctionRoundDown : public IFunction
 {
 public:
     static constexpr auto name = "roundDown";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRoundDown>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRoundDown>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsStringArray.h b/src/Functions/FunctionsStringArray.h
index 6d1b8723653..60dd624bd4f 100644
--- a/src/Functions/FunctionsStringArray.h
+++ b/src/Functions/FunctionsStringArray.h
@@ -345,7 +345,7 @@ class FunctionTokens : public IFunction
 {
 public:
     static constexpr auto name = Generator::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionTokens>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTokens>(); }
 
     String getName() const override
     {
@@ -508,7 +508,7 @@ private:
 
 public:
     static constexpr auto name = "arrayStringConcat";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayStringConcat>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayStringConcat>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/FunctionsStringHash.h b/src/Functions/FunctionsStringHash.h
index 72fb6e4c76d..1001d3143f8 100644
--- a/src/Functions/FunctionsStringHash.h
+++ b/src/Functions/FunctionsStringHash.h
@@ -10,6 +10,7 @@
 #include <DataTypes/DataTypeString.h>
 #include <Functions/FunctionHelpers.h>
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
@@ -34,7 +35,7 @@ public:
     static constexpr size_t max_shingle_size = 25;
     static constexpr size_t max_num_hashes = 25;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionsStringHash>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsStringHash>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsStringSearch.h b/src/Functions/FunctionsStringSearch.h
index 75579b28fd3..abbf4e5e650 100644
--- a/src/Functions/FunctionsStringSearch.h
+++ b/src/Functions/FunctionsStringSearch.h
@@ -51,7 +51,7 @@ class FunctionsStringSearch : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionsStringSearch>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsStringSearch>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsStringSearchToString.h b/src/Functions/FunctionsStringSearchToString.h
index 3b910ae51af..424a54be434 100644
--- a/src/Functions/FunctionsStringSearchToString.h
+++ b/src/Functions/FunctionsStringSearchToString.h
@@ -36,7 +36,7 @@ class FunctionsStringSearchToString : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionsStringSearchToString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsStringSearchToString>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/FunctionsStringSimilarity.h b/src/Functions/FunctionsStringSimilarity.h
index ba725fbd598..cd5ed405c89 100644
--- a/src/Functions/FunctionsStringSimilarity.h
+++ b/src/Functions/FunctionsStringSimilarity.h
@@ -6,6 +6,7 @@
 #include <DataTypes/DataTypesNumber.h>
 #include <Functions/FunctionHelpers.h>
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
@@ -32,7 +33,7 @@ class FunctionsStringSimilarity : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionsStringSimilarity>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionsStringSimilarity>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/IFunction.h b/src/Functions/IFunction.h
index e94449335fb..f9217d30707 100644
--- a/src/Functions/IFunction.h
+++ b/src/Functions/IFunction.h
@@ -1,16 +1,16 @@
 #pragma once
 
-#include <memory>
-
-#include <Core/Names.h>
-#include <Core/ColumnsWithTypeAndName.h>
 #include <Core/ColumnNumbers.h>
+#include <Core/ColumnsWithTypeAndName.h>
+#include <Core/Names.h>
 #include <DataTypes/IDataType.h>
 
 #if !defined(ARCADIA_BUILD)
 #    include "config_core.h"
 #endif
 
+#include <memory>
+
 /// This file contains user interface for functions.
 /// For developer interface (in case you need to implement a new function) see IFunctionImpl.h
 
diff --git a/src/Functions/IFunctionAdaptors.h b/src/Functions/IFunctionAdaptors.h
index cbb71c99b1b..2b9034dc784 100644
--- a/src/Functions/IFunctionAdaptors.h
+++ b/src/Functions/IFunctionAdaptors.h
@@ -1,4 +1,5 @@
 #pragma once
+
 #include <Functions/IFunctionImpl.h>
 
 namespace DB
diff --git a/src/Functions/IFunctionImpl.h b/src/Functions/IFunctionImpl.h
index a9ec6926c63..f75fe07122d 100644
--- a/src/Functions/IFunctionImpl.h
+++ b/src/Functions/IFunctionImpl.h
@@ -1,4 +1,5 @@
 #pragma once
+
 #include <Functions/IFunction.h>
 
 /// This file contains developer interface for functions.
diff --git a/src/Functions/LeastGreatestGeneric.h b/src/Functions/LeastGreatestGeneric.h
index b13286daded..583f0851777 100644
--- a/src/Functions/LeastGreatestGeneric.h
+++ b/src/Functions/LeastGreatestGeneric.h
@@ -30,7 +30,7 @@ class FunctionLeastGreatestGeneric : public IFunction
 {
 public:
     static constexpr auto name = kind == LeastGreatest::Least ? "least" : "greatest";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionLeastGreatestGeneric<kind>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionLeastGreatestGeneric<kind>>(); }
 
 private:
     String getName() const override { return name; }
@@ -92,12 +92,12 @@ class LeastGreatestOverloadResolver : public IFunctionOverloadResolverImpl
 public:
     static constexpr auto name = kind == LeastGreatest::Least ? "least" : "greatest";
 
-    static FunctionOverloadResolverImplPtr create(const Context & context)
+    static FunctionOverloadResolverImplPtr create(ContextPtr context)
     {
         return std::make_unique<LeastGreatestOverloadResolver<kind, SpecializedFunction>>(context);
     }
 
-    explicit LeastGreatestOverloadResolver(const Context & context_) : context(context_) {}
+    explicit LeastGreatestOverloadResolver(ContextPtr context_) : context(context_) {}
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 0; }
@@ -127,7 +127,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/PerformanceAdaptors.h b/src/Functions/PerformanceAdaptors.h
index 5d4d013691c..113ee24ca6f 100644
--- a/src/Functions/PerformanceAdaptors.h
+++ b/src/Functions/PerformanceAdaptors.h
@@ -172,7 +172,7 @@ namespace detail
  * /// default implementation.
  * class MyFunction : public MyDefaultImpl
  * {
- *     MyFunction(const Context & context) : selector(context) {
+ *     MyFunction(ContextPtr context) : selector(context) {
  *         /// Register all implementations in constructor.
  *         /// There could be as many implementation for every target as you want.
  *         selector.registerImplementation<TargetArch::Default, MyDefaultImpl>();
@@ -185,7 +185,7 @@ namespace detail
  *         selector.selectAndExecute(...);
  *     }
  *
- *     static FunctionPtr create(const Context & context) {
+ *     static FunctionPtr create(ContextPtr context) {
  *         return std::make_shared<MyFunction>(context);
  *     }
  * private:
@@ -193,12 +193,12 @@ namespace detail
  * };
  */
 template <typename FunctionInterface>
-class ImplementationSelector
+class ImplementationSelector : WithContext
 {
 public:
     using ImplementationPtr = std::shared_ptr<FunctionInterface>;
 
-    ImplementationSelector(const Context & context_) : context(context_) {}
+    ImplementationSelector(ContextPtr context_) : WithContext(context_) {}
 
     /* Select the best implementation based on previous runs.
      * If FunctionInterface is IFunction, then "executeImpl" method of the implementation will be called
@@ -248,7 +248,7 @@ public:
         if (isArchSupported(Arch))
         {
             // TODO(dakovalkov): make this option better.
-            const auto & choose_impl = context.getSettingsRef().function_implementation.value;
+            const auto & choose_impl = getContext()->getSettingsRef().function_implementation.value;
             if (choose_impl.empty() || choose_impl == detail::getImplementationTag<FunctionImpl>(Arch))
             {
                 implementations.emplace_back(std::make_shared<FunctionImpl>(std::forward<Args>(args)...));
@@ -258,7 +258,6 @@ public:
     }
 
 private:
-    const Context & context;
     std::vector<ImplementationPtr> implementations;
     mutable detail::PerformanceStatistics statistics; /// It is protected by internal mutex.
 };
diff --git a/src/Functions/URL/FirstSignificantSubdomainCustomImpl.h b/src/Functions/URL/FirstSignificantSubdomainCustomImpl.h
index d6868834f75..4670d610725 100644
--- a/src/Functions/URL/FirstSignificantSubdomainCustomImpl.h
+++ b/src/Functions/URL/FirstSignificantSubdomainCustomImpl.h
@@ -36,7 +36,7 @@ class FunctionCutToFirstSignificantSubdomainCustomImpl : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionCutToFirstSignificantSubdomainCustomImpl>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCutToFirstSignificantSubdomainCustomImpl>(); }
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
diff --git a/src/Functions/URL/port.cpp b/src/Functions/URL/port.cpp
index adc3ffa5001..382ea71eda5 100644
--- a/src/Functions/URL/port.cpp
+++ b/src/Functions/URL/port.cpp
@@ -21,7 +21,7 @@ namespace ErrorCodes
 struct FunctionPort : public IFunction
 {
     static constexpr auto name = "port";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionPort>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionPort>(); }
 
     String getName() const override { return name; }
     bool isVariadic() const override { return true; }
diff --git a/src/Functions/abtesting.cpp b/src/Functions/abtesting.cpp
index 7bed2f4a2b9..871357fe450 100644
--- a/src/Functions/abtesting.cpp
+++ b/src/Functions/abtesting.cpp
@@ -168,7 +168,7 @@ class FunctionBayesAB : public IFunction
 public:
     static constexpr auto name = "bayesAB";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBayesAB>();
     }
diff --git a/src/Functions/addressToLine.cpp b/src/Functions/addressToLine.cpp
index a115b13e54a..554e154e866 100644
--- a/src/Functions/addressToLine.cpp
+++ b/src/Functions/addressToLine.cpp
@@ -36,9 +36,9 @@ class FunctionAddressToLine : public IFunction
 {
 public:
     static constexpr auto name = "addressToLine";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        context.checkAccess(AccessType::addressToLine);
+        context->checkAccess(AccessType::addressToLine);
         return std::make_shared<FunctionAddressToLine>();
     }
 
diff --git a/src/Functions/addressToSymbol.cpp b/src/Functions/addressToSymbol.cpp
index 5accfd1dd94..db8fe8d3b60 100644
--- a/src/Functions/addressToSymbol.cpp
+++ b/src/Functions/addressToSymbol.cpp
@@ -28,9 +28,9 @@ class FunctionAddressToSymbol : public IFunction
 {
 public:
     static constexpr auto name = "addressToSymbol";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        context.checkAccess(AccessType::addressToSymbol);
+        context->checkAccess(AccessType::addressToSymbol);
         return std::make_shared<FunctionAddressToSymbol>();
     }
 
diff --git a/src/Functions/appendTrailingCharIfAbsent.cpp b/src/Functions/appendTrailingCharIfAbsent.cpp
index 7ba9a870105..aa939860560 100644
--- a/src/Functions/appendTrailingCharIfAbsent.cpp
+++ b/src/Functions/appendTrailingCharIfAbsent.cpp
@@ -24,7 +24,7 @@ class FunctionAppendTrailingCharIfAbsent : public IFunction
 {
 public:
     static constexpr auto name = "appendTrailingCharIfAbsent";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionAppendTrailingCharIfAbsent>();
     }
diff --git a/src/Functions/array/FunctionArrayMapped.h b/src/Functions/array/FunctionArrayMapped.h
index e336a86d994..4b6320824fa 100644
--- a/src/Functions/array/FunctionArrayMapped.h
+++ b/src/Functions/array/FunctionArrayMapped.h
@@ -11,6 +11,7 @@
 #include <Functions/IFunctionImpl.h>
 #include <Functions/FunctionHelpers.h>
 #include <IO/WriteHelpers.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
@@ -43,7 +44,7 @@ class FunctionArrayMapped : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayMapped>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayMapped>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/array/array.cpp b/src/Functions/array/array.cpp
index ef36069015c..3c6d4066e7c 100644
--- a/src/Functions/array/array.cpp
+++ b/src/Functions/array/array.cpp
@@ -14,7 +14,7 @@ class FunctionArray : public IFunction
 {
 public:
     static constexpr auto name = "array";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionArray>();
     }
diff --git a/src/Functions/array/arrayConcat.cpp b/src/Functions/array/arrayConcat.cpp
index 5ab22dede19..2908fbef7e0 100644
--- a/src/Functions/array/arrayConcat.cpp
+++ b/src/Functions/array/arrayConcat.cpp
@@ -26,7 +26,7 @@ class FunctionArrayConcat : public IFunction
 {
 public:
     static constexpr auto name = "arrayConcat";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayConcat>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayConcat>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayDistinct.cpp b/src/Functions/array/arrayDistinct.cpp
index e3be840b01f..cf73a577def 100644
--- a/src/Functions/array/arrayDistinct.cpp
+++ b/src/Functions/array/arrayDistinct.cpp
@@ -26,7 +26,7 @@ class FunctionArrayDistinct : public IFunction
 public:
     static constexpr auto name = "arrayDistinct";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionArrayDistinct>();
     }
diff --git a/src/Functions/array/arrayElement.cpp b/src/Functions/array/arrayElement.cpp
index 2d6a99c2258..4254b00e4bc 100644
--- a/src/Functions/array/arrayElement.cpp
+++ b/src/Functions/array/arrayElement.cpp
@@ -41,7 +41,7 @@ class FunctionArrayElement : public IFunction
 {
 public:
     static constexpr auto name = "arrayElement";
-    static FunctionPtr create(const Context & context);
+    static FunctionPtr create(ContextPtr context);
 
     String getName() const override;
 
@@ -449,7 +449,7 @@ struct ArrayElementGenericImpl
 }
 
 
-FunctionPtr FunctionArrayElement::create(const Context &)
+FunctionPtr FunctionArrayElement::create(ContextPtr)
 {
     return std::make_shared<FunctionArrayElement>();
 }
diff --git a/src/Functions/array/arrayEnumerate.cpp b/src/Functions/array/arrayEnumerate.cpp
index 82bb25e2129..b77fc9a468f 100644
--- a/src/Functions/array/arrayEnumerate.cpp
+++ b/src/Functions/array/arrayEnumerate.cpp
@@ -22,7 +22,7 @@ class FunctionArrayEnumerate : public IFunction
 public:
     static constexpr auto name = "arrayEnumerate";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionArrayEnumerate>();
     }
diff --git a/src/Functions/array/arrayEnumerateExtended.h b/src/Functions/array/arrayEnumerateExtended.h
index 39bdd2a515e..9edf7959354 100644
--- a/src/Functions/array/arrayEnumerateExtended.h
+++ b/src/Functions/array/arrayEnumerateExtended.h
@@ -30,7 +30,7 @@ template <typename Derived>
 class FunctionArrayEnumerateExtended : public IFunction
 {
 public:
-    static FunctionPtr create(const Context &) { return std::make_shared<Derived>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<Derived>(); }
 
     String getName() const override { return Derived::name; }
 
diff --git a/src/Functions/array/arrayEnumerateRanked.h b/src/Functions/array/arrayEnumerateRanked.h
index ce82b8bcd86..2d13482b01e 100644
--- a/src/Functions/array/arrayEnumerateRanked.h
+++ b/src/Functions/array/arrayEnumerateRanked.h
@@ -90,7 +90,7 @@ template <typename Derived>
 class FunctionArrayEnumerateRankedExtended : public IFunction
 {
 public:
-    static FunctionPtr create(const Context & /* context */) { return std::make_shared<Derived>(); }
+    static FunctionPtr create(ContextPtr /* context */) { return std::make_shared<Derived>(); }
 
     String getName() const override { return Derived::name; }
 
diff --git a/src/Functions/array/arrayFlatten.cpp b/src/Functions/array/arrayFlatten.cpp
index f9330bcd432..e1b8f96b2ee 100644
--- a/src/Functions/array/arrayFlatten.cpp
+++ b/src/Functions/array/arrayFlatten.cpp
@@ -20,7 +20,7 @@ class ArrayFlatten : public IFunction
 public:
     static constexpr auto name = "arrayFlatten";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<ArrayFlatten>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<ArrayFlatten>(); }
 
     size_t getNumberOfArguments() const override { return 1; }
     bool useDefaultImplementationForConstants() const override { return true; }
diff --git a/src/Functions/array/arrayIndex.h b/src/Functions/array/arrayIndex.h
index bc9e0b5608d..fb9496e634f 100644
--- a/src/Functions/array/arrayIndex.h
+++ b/src/Functions/array/arrayIndex.h
@@ -354,7 +354,7 @@ class FunctionArrayIndex : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayIndex>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayIndex>(); }
 
     /// Get function name.
     String getName() const override { return name; }
diff --git a/src/Functions/array/arrayIntersect.cpp b/src/Functions/array/arrayIntersect.cpp
index 736069d6060..7275a1395c0 100644
--- a/src/Functions/array/arrayIntersect.cpp
+++ b/src/Functions/array/arrayIntersect.cpp
@@ -38,8 +38,8 @@ class FunctionArrayIntersect : public IFunction
 {
 public:
     static constexpr auto name = "arrayIntersect";
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionArrayIntersect>(context); }
-    explicit FunctionArrayIntersect(const Context & context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionArrayIntersect>(context); }
+    explicit FunctionArrayIntersect(ContextPtr context_) : context(context_) {}
 
     String getName() const override { return name; }
 
@@ -53,7 +53,7 @@ public:
     bool useDefaultImplementationForConstants() const override { return true; }
 
 private:
-    const Context & context;
+    ContextPtr context;
 
     /// Initially allocate a piece of memory for 64 elements. NOTE: This is just a guess.
     static constexpr size_t INITIAL_SIZE_DEGREE = 6;
@@ -281,7 +281,7 @@ FunctionArrayIntersect::CastArgumentsResult FunctionArrayIntersect::castColumns(
     return {.initial = initial_columns, .casted = casted_columns};
 }
 
-static ColumnPtr callFunctionNotEquals(ColumnWithTypeAndName first, ColumnWithTypeAndName second, const Context & context)
+static ColumnPtr callFunctionNotEquals(ColumnWithTypeAndName first, ColumnWithTypeAndName second, ContextPtr context)
 {
     ColumnsWithTypeAndName args{first, second};
     auto eq_func = FunctionFactory::instance().get("notEquals", context)->build(args);
diff --git a/src/Functions/array/arrayJoin.cpp b/src/Functions/array/arrayJoin.cpp
index c4991b0663e..1ba215239ec 100644
--- a/src/Functions/array/arrayJoin.cpp
+++ b/src/Functions/array/arrayJoin.cpp
@@ -20,7 +20,7 @@ class FunctionArrayJoin : public IFunction
 {
 public:
     static constexpr auto name = "arrayJoin";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionArrayJoin>();
     }
diff --git a/src/Functions/array/arrayPopBack.cpp b/src/Functions/array/arrayPopBack.cpp
index d69e59e7128..0b532c22661 100644
--- a/src/Functions/array/arrayPopBack.cpp
+++ b/src/Functions/array/arrayPopBack.cpp
@@ -9,7 +9,7 @@ class FunctionArrayPopBack : public FunctionArrayPop
 {
 public:
     static constexpr auto name = "arrayPopBack";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayPopBack>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayPopBack>(); }
     FunctionArrayPopBack() : FunctionArrayPop(false, name) {}
 };
 
diff --git a/src/Functions/array/arrayPopFront.cpp b/src/Functions/array/arrayPopFront.cpp
index ca9ce923aaa..57eedf9b44a 100644
--- a/src/Functions/array/arrayPopFront.cpp
+++ b/src/Functions/array/arrayPopFront.cpp
@@ -9,7 +9,7 @@ class FunctionArrayPopFront : public FunctionArrayPop
 {
 public:
     static constexpr auto name = "arrayPopFront";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayPopFront>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayPopFront>(); }
     FunctionArrayPopFront() : FunctionArrayPop(true, name) {}
 };
 
diff --git a/src/Functions/array/arrayPushBack.cpp b/src/Functions/array/arrayPushBack.cpp
index 3c6d4113b88..3171bca9d2c 100644
--- a/src/Functions/array/arrayPushBack.cpp
+++ b/src/Functions/array/arrayPushBack.cpp
@@ -9,7 +9,7 @@ class FunctionArrayPushBack : public FunctionArrayPush
 {
 public:
     static constexpr auto name = "arrayPushBack";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayPushBack>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayPushBack>(); }
     FunctionArrayPushBack() : FunctionArrayPush(false, name) {}
 };
 
diff --git a/src/Functions/array/arrayPushFront.cpp b/src/Functions/array/arrayPushFront.cpp
index 49f47170f3c..d12dfe02af1 100644
--- a/src/Functions/array/arrayPushFront.cpp
+++ b/src/Functions/array/arrayPushFront.cpp
@@ -10,7 +10,7 @@ class FunctionArrayPushFront : public FunctionArrayPush
 {
 public:
     static constexpr auto name = "arrayPushFront";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayPushFront>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayPushFront>(); }
     FunctionArrayPushFront() : FunctionArrayPush(true, name) {}
 };
 
diff --git a/src/Functions/array/arrayReduce.cpp b/src/Functions/array/arrayReduce.cpp
index 0611a4f5d0c..1e1ae08ff3a 100644
--- a/src/Functions/array/arrayReduce.cpp
+++ b/src/Functions/array/arrayReduce.cpp
@@ -37,7 +37,7 @@ class FunctionArrayReduce : public IFunction
 {
 public:
     static constexpr auto name = "arrayReduce";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayReduce>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayReduce>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayReduceInRanges.cpp b/src/Functions/array/arrayReduceInRanges.cpp
index 55e4d81f36c..ea87fc96630 100644
--- a/src/Functions/array/arrayReduceInRanges.cpp
+++ b/src/Functions/array/arrayReduceInRanges.cpp
@@ -40,7 +40,7 @@ class FunctionArrayReduceInRanges : public IFunction
 public:
     static const size_t minimum_step = 64;
     static constexpr auto name = "arrayReduceInRanges";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayReduceInRanges>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayReduceInRanges>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayResize.cpp b/src/Functions/array/arrayResize.cpp
index 0f7f20d7747..eead7a0fa84 100644
--- a/src/Functions/array/arrayResize.cpp
+++ b/src/Functions/array/arrayResize.cpp
@@ -25,7 +25,7 @@ class FunctionArrayResize : public IFunction
 {
 public:
     static constexpr auto name = "arrayResize";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayResize>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayResize>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayReverse.cpp b/src/Functions/array/arrayReverse.cpp
index 1eb07c53497..5928ab0d72f 100644
--- a/src/Functions/array/arrayReverse.cpp
+++ b/src/Functions/array/arrayReverse.cpp
@@ -24,7 +24,7 @@ class FunctionArrayReverse : public IFunction
 {
 public:
     static constexpr auto name = "arrayReverse";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayReverse>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayReverse>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayScalarProduct.h b/src/Functions/array/arrayScalarProduct.h
index 2ff8b88b2f0..6a23d6a45d8 100644
--- a/src/Functions/array/arrayScalarProduct.h
+++ b/src/Functions/array/arrayScalarProduct.h
@@ -25,7 +25,7 @@ class FunctionArrayScalarProduct : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayScalarProduct>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayScalarProduct>(); }
 
 private:
     using ResultColumnType = ColumnVector<typename Method::ResultType>;
diff --git a/src/Functions/array/arraySlice.cpp b/src/Functions/array/arraySlice.cpp
index 1e72e6a45cf..859d3b99db2 100644
--- a/src/Functions/array/arraySlice.cpp
+++ b/src/Functions/array/arraySlice.cpp
@@ -34,7 +34,7 @@ class FunctionArraySlice : public IFunction
 {
 public:
     static constexpr auto name = "arraySlice";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArraySlice>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArraySlice>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayUniq.cpp b/src/Functions/array/arrayUniq.cpp
index 70246872f6b..ba0bcf8cd0c 100644
--- a/src/Functions/array/arrayUniq.cpp
+++ b/src/Functions/array/arrayUniq.cpp
@@ -31,7 +31,7 @@ class FunctionArrayUniq : public IFunction
 public:
     static constexpr auto name = "arrayUniq";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayUniq>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayUniq>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/arrayWithConstant.cpp b/src/Functions/array/arrayWithConstant.cpp
index f9fc0ac3b66..453e95ed3b5 100644
--- a/src/Functions/array/arrayWithConstant.cpp
+++ b/src/Functions/array/arrayWithConstant.cpp
@@ -30,7 +30,7 @@ class FunctionArrayWithConstant : public IFunction
 public:
     static constexpr auto name = "arrayWithConstant";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayWithConstant>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayWithConstant>(); }
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
diff --git a/src/Functions/array/arrayZip.cpp b/src/Functions/array/arrayZip.cpp
index 5a377355710..f77b4f6dfe9 100644
--- a/src/Functions/array/arrayZip.cpp
+++ b/src/Functions/array/arrayZip.cpp
@@ -23,7 +23,7 @@ class FunctionArrayZip : public IFunction
 {
 public:
     static constexpr auto name = "arrayZip";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayZip>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayZip>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/array/emptyArray.cpp b/src/Functions/array/emptyArray.cpp
index ac227370180..54d9b794ba5 100644
--- a/src/Functions/array/emptyArray.cpp
+++ b/src/Functions/array/emptyArray.cpp
@@ -29,7 +29,7 @@ struct FunctionEmptyArray : public IFunction
 {
     static constexpr auto base_name = "emptyArray";
     static const String name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionEmptyArray>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionEmptyArray>(); }
 
 private:
     String getName() const override
diff --git a/src/Functions/array/emptyArrayToSingle.cpp b/src/Functions/array/emptyArrayToSingle.cpp
index e3bfe62ac22..8f726d55ab0 100644
--- a/src/Functions/array/emptyArrayToSingle.cpp
+++ b/src/Functions/array/emptyArrayToSingle.cpp
@@ -27,7 +27,7 @@ class FunctionEmptyArrayToSingle : public IFunction
 {
 public:
     static constexpr auto name = "emptyArrayToSingle";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionEmptyArrayToSingle>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionEmptyArrayToSingle>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/array/hasAll.cpp b/src/Functions/array/hasAll.cpp
index 27843b76f66..c1959515e9f 100644
--- a/src/Functions/array/hasAll.cpp
+++ b/src/Functions/array/hasAll.cpp
@@ -10,7 +10,7 @@ class FunctionArrayHasAll : public FunctionArrayHasAllAny
 {
 public:
     static constexpr auto name = "hasAll";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayHasAll>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayHasAll>(); }
     FunctionArrayHasAll() : FunctionArrayHasAllAny(GatherUtils::ArraySearchType::All, name) {}
 };
 
diff --git a/src/Functions/array/hasAny.cpp b/src/Functions/array/hasAny.cpp
index 085a01c008e..fac810c7ba1 100644
--- a/src/Functions/array/hasAny.cpp
+++ b/src/Functions/array/hasAny.cpp
@@ -10,7 +10,7 @@ class FunctionArrayHasAny : public FunctionArrayHasAllAny
 {
 public:
     static constexpr auto name = "hasAny";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayHasAny>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayHasAny>(); }
     FunctionArrayHasAny() : FunctionArrayHasAllAny(GatherUtils::ArraySearchType::Any, name) {}
 };
 
diff --git a/src/Functions/array/hasSubstr.cpp b/src/Functions/array/hasSubstr.cpp
index 73430824b57..886f82f577b 100644
--- a/src/Functions/array/hasSubstr.cpp
+++ b/src/Functions/array/hasSubstr.cpp
@@ -10,7 +10,7 @@ class FunctionArrayHasSubstr : public FunctionArrayHasAllAny
 {
 public:
     static constexpr auto name = "hasSubstr";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionArrayHasSubstr>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionArrayHasSubstr>(); }
     FunctionArrayHasSubstr() : FunctionArrayHasAllAny(GatherUtils::ArraySearchType::Substr, name) {}
 };
 
diff --git a/src/Functions/array/mapOp.cpp b/src/Functions/array/mapOp.cpp
index c30488cb25b..78b7ce2b155 100644
--- a/src/Functions/array/mapOp.cpp
+++ b/src/Functions/array/mapOp.cpp
@@ -43,7 +43,7 @@ class FunctionMapOp : public IFunction
 {
 public:
     static constexpr auto name = (op_type == OpTypes::ADD) ? "mapAdd" : "mapSubtract";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMapOp>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMapOp>(); }
 
 private:
     String getName() const override { return name; }
diff --git a/src/Functions/array/mapPopulateSeries.cpp b/src/Functions/array/mapPopulateSeries.cpp
index c025117af69..eb2f6192346 100644
--- a/src/Functions/array/mapPopulateSeries.cpp
+++ b/src/Functions/array/mapPopulateSeries.cpp
@@ -23,7 +23,7 @@ class FunctionMapPopulateSeries : public IFunction
 {
 public:
     static constexpr auto name = "mapPopulateSeries";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMapPopulateSeries>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMapPopulateSeries>(); }
 
 private:
     String getName() const override { return name; }
diff --git a/src/Functions/array/range.cpp b/src/Functions/array/range.cpp
index ac968786923..1b1ab802578 100644
--- a/src/Functions/array/range.cpp
+++ b/src/Functions/array/range.cpp
@@ -32,7 +32,7 @@ class FunctionRange : public IFunction
 public:
     static constexpr auto name = "range";
     static constexpr size_t max_elements = 100'000'000;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRange>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRange>(); }
 
 private:
     String getName() const override { return name; }
diff --git a/src/Functions/assumeNotNull.cpp b/src/Functions/assumeNotNull.cpp
index ab0d50c8c56..83c595eb0ab 100644
--- a/src/Functions/assumeNotNull.cpp
+++ b/src/Functions/assumeNotNull.cpp
@@ -19,7 +19,7 @@ class FunctionAssumeNotNull : public IFunction
 public:
     static constexpr auto name = "assumeNotNull";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionAssumeNotNull>();
     }
diff --git a/src/Functions/bar.cpp b/src/Functions/bar.cpp
index 6f5298a8c5e..c2b5f93994e 100644
--- a/src/Functions/bar.cpp
+++ b/src/Functions/bar.cpp
@@ -29,7 +29,7 @@ class FunctionBar : public IFunction
 {
 public:
     static constexpr auto name = "bar";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBar>();
     }
diff --git a/src/Functions/bitHammingDistance.cpp b/src/Functions/bitHammingDistance.cpp
index 9b9ff5b6c07..25b902b8bd5 100644
--- a/src/Functions/bitHammingDistance.cpp
+++ b/src/Functions/bitHammingDistance.cpp
@@ -74,7 +74,7 @@ class FunctionBitHammingDistance : public IFunction
 public:
     static constexpr auto name = "bitHammingDistance";
     using ResultType = UInt8;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitHammingDistance>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitHammingDistance>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/bitmaskToList.cpp b/src/Functions/bitmaskToList.cpp
index ccd163895ff..4b9a54f805f 100644
--- a/src/Functions/bitmaskToList.cpp
+++ b/src/Functions/bitmaskToList.cpp
@@ -30,7 +30,7 @@ class FunctionBitmaskToList : public IFunction
 {
 public:
     static constexpr auto name = "bitmaskToList";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionBitmaskToList>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionBitmaskToList>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/blockNumber.cpp b/src/Functions/blockNumber.cpp
index 512dd9bcf29..0b7d47a67ec 100644
--- a/src/Functions/blockNumber.cpp
+++ b/src/Functions/blockNumber.cpp
@@ -18,7 +18,7 @@ private:
 
 public:
     static constexpr auto name = "blockNumber";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBlockNumber>();
     }
diff --git a/src/Functions/blockSerializedSize.cpp b/src/Functions/blockSerializedSize.cpp
index 5a66c5d08af..f34a354836a 100644
--- a/src/Functions/blockSerializedSize.cpp
+++ b/src/Functions/blockSerializedSize.cpp
@@ -15,7 +15,7 @@ class FunctionBlockSerializedSize : public IFunction
 public:
     static constexpr auto name = "blockSerializedSize";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBlockSerializedSize>();
     }
diff --git a/src/Functions/blockSize.cpp b/src/Functions/blockSize.cpp
index f08c0b0d963..9572cc19c06 100644
--- a/src/Functions/blockSize.cpp
+++ b/src/Functions/blockSize.cpp
@@ -15,7 +15,7 @@ class FunctionBlockSize : public IFunction
 {
 public:
     static constexpr auto name = "blockSize";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBlockSize>();
     }
diff --git a/src/Functions/buildId.cpp b/src/Functions/buildId.cpp
index 7361f0e4546..a0bad20023f 100644
--- a/src/Functions/buildId.cpp
+++ b/src/Functions/buildId.cpp
@@ -18,7 +18,7 @@ class FunctionBuildId : public IFunction
 {
 public:
     static constexpr auto name = "buildId";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionBuildId>();
     }
diff --git a/src/Functions/byteSize.cpp b/src/Functions/byteSize.cpp
index ea1a9c83581..76080f2850c 100644
--- a/src/Functions/byteSize.cpp
+++ b/src/Functions/byteSize.cpp
@@ -17,7 +17,7 @@ class FunctionByteSize : public IFunction
 {
 public:
     static constexpr auto name = "byteSize";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionByteSize>();
     }
diff --git a/src/Functions/caseWithExpression.cpp b/src/Functions/caseWithExpression.cpp
index 195eb7e72ae..24b5855cc5b 100644
--- a/src/Functions/caseWithExpression.cpp
+++ b/src/Functions/caseWithExpression.cpp
@@ -1,6 +1,6 @@
-#include <Functions/FunctionFactory.h>
 #include <DataTypes/DataTypeArray.h>
 #include <DataTypes/getLeastSupertype.h>
+#include <Functions/FunctionFactory.h>
 
 
 namespace DB
@@ -20,9 +20,9 @@ class FunctionCaseWithExpression : public IFunction
 {
 public:
     static constexpr auto name = "caseWithExpression";
-    static FunctionPtr create(const Context & context_) { return std::make_shared<FunctionCaseWithExpression>(context_); }
+    static FunctionPtr create(ContextPtr context_) { return std::make_shared<FunctionCaseWithExpression>(context_); }
 
-    explicit FunctionCaseWithExpression(const Context & context_) : context(context_) {}
+    explicit FunctionCaseWithExpression(ContextPtr context_) : context(context_) {}
     bool isVariadic() const override { return true; }
     size_t getNumberOfArguments() const override { return 0; }
     String getName() const override { return name; }
@@ -98,7 +98,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/coalesce.cpp b/src/Functions/coalesce.cpp
index 12521185532..05dd83c5b63 100644
--- a/src/Functions/coalesce.cpp
+++ b/src/Functions/coalesce.cpp
@@ -1,17 +1,18 @@
-#include <Functions/IFunctionImpl.h>
-#include <Functions/FunctionHelpers.h>
-#include <Functions/FunctionFactory.h>
-#include <DataTypes/DataTypesNumber.h>
-#include <DataTypes/DataTypeNullable.h>
-#include <DataTypes/DataTypeNothing.h>
-#include <DataTypes/getLeastSupertype.h>
-#include <Core/ColumnNumbers.h>
-#include <Columns/ColumnNullable.h>
 #include <Columns/ColumnLowCardinality.h>
+#include <Columns/ColumnNullable.h>
+#include <Core/ColumnNumbers.h>
+#include <DataTypes/DataTypeNothing.h>
+#include <DataTypes/DataTypeNullable.h>
+#include <DataTypes/DataTypesNumber.h>
+#include <DataTypes/getLeastSupertype.h>
+#include <Functions/FunctionFactory.h>
+#include <Functions/FunctionHelpers.h>
+#include <Functions/IFunctionImpl.h>
 
 
 namespace DB
 {
+
 namespace
 {
 
@@ -23,12 +24,12 @@ class FunctionCoalesce : public IFunction
 public:
     static constexpr auto name = "coalesce";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionCoalesce>(context);
     }
 
-    explicit FunctionCoalesce(const Context & context_) : context(context_) {}
+    explicit FunctionCoalesce(ContextPtr context_) : context(context_) {}
 
     std::string getName() const override
     {
@@ -159,7 +160,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/concat.cpp b/src/Functions/concat.cpp
index de4d5e9efc4..e8a3c44efb1 100644
--- a/src/Functions/concat.cpp
+++ b/src/Functions/concat.cpp
@@ -33,8 +33,8 @@ class ConcatImpl : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    explicit ConcatImpl(const Context & context_) : context(context_) {}
-    static FunctionPtr create(const Context & context) { return std::make_shared<ConcatImpl>(context); }
+    explicit ConcatImpl(ContextPtr context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<ConcatImpl>(context); }
 
     String getName() const override { return name; }
 
@@ -85,7 +85,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextWeakPtr context;
 
     ColumnPtr executeBinary(const ColumnsWithTypeAndName & arguments, size_t input_rows_count) const
     {
@@ -191,9 +191,9 @@ class ConcatOverloadResolver : public IFunctionOverloadResolverImpl
 {
 public:
     static constexpr auto name = "concat";
-    static FunctionOverloadResolverImplPtr create(const Context & context) { return std::make_unique<ConcatOverloadResolver>(context); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr context) { return std::make_unique<ConcatOverloadResolver>(context); }
 
-    explicit ConcatOverloadResolver(const Context & context_) : context(context_) {}
+    explicit ConcatOverloadResolver(ContextPtr context_) : context(context_) {}
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 0; }
@@ -223,7 +223,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/connectionId.cpp b/src/Functions/connectionId.cpp
index 1eec764d923..780ee5e19aa 100644
--- a/src/Functions/connectionId.cpp
+++ b/src/Functions/connectionId.cpp
@@ -8,14 +8,14 @@ namespace DB
 {
 
 /// Get the connection Id. It's used for MySQL handler only.
-class FunctionConnectionId : public IFunction
+class FunctionConnectionId : public IFunction, WithContext
 {
 public:
     static constexpr auto name = "connectionId";
 
-    explicit FunctionConnectionId(const Context & context_) : context(context_) {}
+    explicit FunctionConnectionId(ContextPtr context_) : WithContext(context_) {}
 
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionConnectionId>(context); }
+    static FunctionPtr create(ContextPtr context_) { return std::make_shared<FunctionConnectionId>(context_); }
 
     String getName() const override { return name; }
 
@@ -25,11 +25,8 @@ public:
 
     ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr & result_type, size_t input_rows_count) const override
     {
-        return result_type->createColumnConst(input_rows_count, context.getClientInfo().connection_id);
+        return result_type->createColumnConst(input_rows_count, getContext()->getClientInfo().connection_id);
     }
-
-private:
-    const Context & context;
 };
 
 void registerFunctionConnectionId(FunctionFactory & factory)
diff --git a/src/Functions/convertCharset.cpp b/src/Functions/convertCharset.cpp
index c32bbc358f5..b204875b4ff 100644
--- a/src/Functions/convertCharset.cpp
+++ b/src/Functions/convertCharset.cpp
@@ -162,7 +162,7 @@ private:
 
 public:
     static constexpr auto name = "convertCharset";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionConvertCharset>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionConvertCharset>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/countDigits.cpp b/src/Functions/countDigits.cpp
index 4469e11a421..6dd927731b8 100644
--- a/src/Functions/countDigits.cpp
+++ b/src/Functions/countDigits.cpp
@@ -28,7 +28,7 @@ class FunctionCountDigits : public IFunction
 public:
     static constexpr auto name = "countDigits";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionCountDigits>();
     }
diff --git a/src/Functions/countMatches.h b/src/Functions/countMatches.h
index be3d06ffb84..4cae039a0d0 100644
--- a/src/Functions/countMatches.h
+++ b/src/Functions/countMatches.h
@@ -27,7 +27,7 @@ class FunctionCountMatches : public IFunction
 {
 public:
     static constexpr auto name = CountMatchesBase::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionCountMatches<CountMatchesBase>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCountMatches<CountMatchesBase>>(); }
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 2; }
diff --git a/src/Functions/currentDatabase.cpp b/src/Functions/currentDatabase.cpp
index 17dbc8d98e4..8be49c6cfe8 100644
--- a/src/Functions/currentDatabase.cpp
+++ b/src/Functions/currentDatabase.cpp
@@ -16,9 +16,9 @@ class FunctionCurrentDatabase : public IFunction
 
 public:
     static constexpr auto name = "currentDatabase";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionCurrentDatabase>(context.getCurrentDatabase());
+        return std::make_shared<FunctionCurrentDatabase>(context->getCurrentDatabase());
     }
 
     explicit FunctionCurrentDatabase(const String & db_name_) : db_name{db_name_}
diff --git a/src/Functions/currentUser.cpp b/src/Functions/currentUser.cpp
index 77eb2228d19..69780f4fa8b 100644
--- a/src/Functions/currentUser.cpp
+++ b/src/Functions/currentUser.cpp
@@ -16,9 +16,9 @@ class FunctionCurrentUser : public IFunction
 
 public:
     static constexpr auto name = "currentUser";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionCurrentUser>(context.getClientInfo().initial_user);
+        return std::make_shared<FunctionCurrentUser>(context->getClientInfo().initial_user);
     }
 
     explicit FunctionCurrentUser(const String & user_name_) : user_name{user_name_}
diff --git a/src/Functions/dateDiff.cpp b/src/Functions/dateDiff.cpp
index f660b92efc5..753fee0e371 100644
--- a/src/Functions/dateDiff.cpp
+++ b/src/Functions/dateDiff.cpp
@@ -44,7 +44,7 @@ class FunctionDateDiff : public IFunction
 {
 public:
     static constexpr auto name = "dateDiff";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionDateDiff>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionDateDiff>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/date_trunc.cpp b/src/Functions/date_trunc.cpp
index f55b3b56536..7952eda4f2b 100644
--- a/src/Functions/date_trunc.cpp
+++ b/src/Functions/date_trunc.cpp
@@ -25,9 +25,9 @@ class FunctionDateTrunc : public IFunction
 public:
     static constexpr auto name = "date_trunc";
 
-    explicit FunctionDateTrunc(const Context & context_) : context(context_) {}
+    explicit FunctionDateTrunc(ContextPtr context_) : context(context_) {}
 
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionDateTrunc>(context); }
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionDateTrunc>(context); }
 
     String getName() const override { return name; }
 
@@ -146,7 +146,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
     mutable IntervalKind::Kind datepart_kind = IntervalKind::Kind::Second;
 };
 
diff --git a/src/Functions/defaultValueOfArgumentType.cpp b/src/Functions/defaultValueOfArgumentType.cpp
index a46715ffaad..85b2f261f60 100644
--- a/src/Functions/defaultValueOfArgumentType.cpp
+++ b/src/Functions/defaultValueOfArgumentType.cpp
@@ -13,7 +13,7 @@ class FunctionDefaultValueOfArgumentType : public IFunction
 {
 public:
     static constexpr auto name = "defaultValueOfArgumentType";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionDefaultValueOfArgumentType>();
     }
diff --git a/src/Functions/defaultValueOfTypeName.cpp b/src/Functions/defaultValueOfTypeName.cpp
index 4f6d19bbc53..7be985cf560 100644
--- a/src/Functions/defaultValueOfTypeName.cpp
+++ b/src/Functions/defaultValueOfTypeName.cpp
@@ -21,7 +21,7 @@ class FunctionDefaultValueOfTypeName : public IFunction
 {
 public:
     static constexpr auto name = "defaultValueOfTypeName";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionDefaultValueOfTypeName>();
     }
diff --git a/src/Functions/demange.cpp b/src/Functions/demange.cpp
index d6cddc18f7a..755a50dccbb 100644
--- a/src/Functions/demange.cpp
+++ b/src/Functions/demange.cpp
@@ -25,9 +25,9 @@ class FunctionDemangle : public IFunction
 {
 public:
     static constexpr auto name = "demangle";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        context.checkAccess(AccessType::demangle);
+        context->checkAccess(AccessType::demangle);
         return std::make_shared<FunctionDemangle>();
     }
 
diff --git a/src/Functions/dumpColumnStructure.cpp b/src/Functions/dumpColumnStructure.cpp
index 723b76616ed..827aabb8df9 100644
--- a/src/Functions/dumpColumnStructure.cpp
+++ b/src/Functions/dumpColumnStructure.cpp
@@ -14,7 +14,7 @@ class FunctionDumpColumnStructure : public IFunction
 {
 public:
     static constexpr auto name = "dumpColumnStructure";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionDumpColumnStructure>();
     }
diff --git a/src/Functions/errorCodeToName.cpp b/src/Functions/errorCodeToName.cpp
index 20e80e457c9..4b96c355cd9 100644
--- a/src/Functions/errorCodeToName.cpp
+++ b/src/Functions/errorCodeToName.cpp
@@ -19,7 +19,7 @@ class FunctionErrorCodeToName : public IFunction
 {
 public:
     static constexpr auto name = "errorCodeToName";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionErrorCodeToName>();
     }
diff --git a/src/Functions/evalMLMethod.cpp b/src/Functions/evalMLMethod.cpp
index 03d26db4043..7bdf4ea7db2 100644
--- a/src/Functions/evalMLMethod.cpp
+++ b/src/Functions/evalMLMethod.cpp
@@ -28,11 +28,11 @@ class FunctionEvalMLMethod : public IFunction
 {
 public:
     static constexpr auto name = "evalMLMethod";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionEvalMLMethod>(context);
     }
-    explicit FunctionEvalMLMethod(const Context & context_) : context(context_)
+    explicit FunctionEvalMLMethod(ContextPtr context_) : context(context_)
     {}
 
     String getName() const override
@@ -81,7 +81,7 @@ public:
         return agg_function->predictValues(arguments, context);
     }
 
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/extractAllGroups.h b/src/Functions/extractAllGroups.h
index 7132c5dae82..c77d497cf17 100644
--- a/src/Functions/extractAllGroups.h
+++ b/src/Functions/extractAllGroups.h
@@ -51,7 +51,7 @@ public:
     static constexpr auto Kind = Impl::Kind;
     static constexpr auto name = Impl::Name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionExtractAllGroups>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionExtractAllGroups>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/extractGroups.cpp b/src/Functions/extractGroups.cpp
index f20e2cf3e88..f1d728ee3f6 100644
--- a/src/Functions/extractGroups.cpp
+++ b/src/Functions/extractGroups.cpp
@@ -31,7 +31,7 @@ class FunctionExtractGroups : public IFunction
 {
 public:
     static constexpr auto name = "extractGroups";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionExtractGroups>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionExtractGroups>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/extractTextFromHTML.cpp b/src/Functions/extractTextFromHTML.cpp
index 528bd0c311f..5ca82eb317d 100644
--- a/src/Functions/extractTextFromHTML.cpp
+++ b/src/Functions/extractTextFromHTML.cpp
@@ -296,7 +296,7 @@ class FunctionExtractTextFromHTML : public IFunction
 public:
     static constexpr auto name = "extractTextFromHTML";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionExtractTextFromHTML>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionExtractTextFromHTML>(); }
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 1; }
     bool useDefaultImplementationForConstants() const override { return true; }
diff --git a/src/Functions/filesystem.cpp b/src/Functions/filesystem.cpp
index 879c48dbe67..565166d2a18 100644
--- a/src/Functions/filesystem.cpp
+++ b/src/Functions/filesystem.cpp
@@ -34,9 +34,9 @@ class FilesystemImpl : public IFunction
 public:
     static constexpr auto name = Impl::name;
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FilesystemImpl<Impl>>(std::filesystem::space(context.getConfigRef().getString("path")));
+        return std::make_shared<FilesystemImpl<Impl>>(std::filesystem::space(context->getConfigRef().getString("path")));
     }
 
     explicit FilesystemImpl(std::filesystem::space_info spaceinfo_) : spaceinfo(spaceinfo_) { }
diff --git a/src/Functions/finalizeAggregation.cpp b/src/Functions/finalizeAggregation.cpp
index 91d80e1d692..6bf6932ceee 100644
--- a/src/Functions/finalizeAggregation.cpp
+++ b/src/Functions/finalizeAggregation.cpp
@@ -24,7 +24,7 @@ class FunctionFinalizeAggregation : public IFunction
 {
 public:
     static constexpr auto name = "finalizeAggregation";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionFinalizeAggregation>();
     }
diff --git a/src/Functions/formatDateTime.cpp b/src/Functions/formatDateTime.cpp
index 5128f077c5a..2239bae987f 100644
--- a/src/Functions/formatDateTime.cpp
+++ b/src/Functions/formatDateTime.cpp
@@ -281,7 +281,7 @@ private:
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionFormatDateTimeImpl>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionFormatDateTimeImpl>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/formatReadable.h b/src/Functions/formatReadable.h
index ae70c1afa87..7a11aa184d9 100644
--- a/src/Functions/formatReadable.h
+++ b/src/Functions/formatReadable.h
@@ -28,7 +28,7 @@ class FunctionFormatReadable : public IFunction
 {
 public:
     static constexpr auto name = Impl::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionFormatReadable<Impl>>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionFormatReadable<Impl>>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/formatReadableTimeDelta.cpp b/src/Functions/formatReadableTimeDelta.cpp
index 9ffdb8464e0..7913a53c9c3 100644
--- a/src/Functions/formatReadableTimeDelta.cpp
+++ b/src/Functions/formatReadableTimeDelta.cpp
@@ -38,7 +38,7 @@ class FunctionFormatReadableTimeDelta : public IFunction
 {
 public:
     static constexpr auto name = "formatReadableTimeDelta";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionFormatReadableTimeDelta>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionFormatReadableTimeDelta>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/formatRow.cpp b/src/Functions/formatRow.cpp
index e8f82669aae..e58149138ad 100644
--- a/src/Functions/formatRow.cpp
+++ b/src/Functions/formatRow.cpp
@@ -35,7 +35,7 @@ class FunctionFormatRow : public IFunction
 public:
     static constexpr auto name = no_newline ? "formatRowNoNewline" : "formatRow";
 
-    FunctionFormatRow(const String & format_name_, const Context & context_) : format_name(format_name_), context(context_)
+    FunctionFormatRow(const String & format_name_, ContextPtr context_) : format_name(format_name_), context(context_)
     {
         if (!FormatFactory::instance().getAllFormats().count(format_name))
             throw Exception("Unknown format " + format_name, ErrorCodes::UNKNOWN_FORMAT);
@@ -76,7 +76,7 @@ public:
 
 private:
     String format_name;
-    const Context & context;
+    ContextPtr context;
 };
 
 template <bool no_newline>
@@ -84,8 +84,8 @@ class FormatRowOverloadResolver : public IFunctionOverloadResolverImpl
 {
 public:
     static constexpr auto name = no_newline ? "formatRowNoNewline" : "formatRow";
-    static FunctionOverloadResolverImplPtr create(const Context & context) { return std::make_unique<FormatRowOverloadResolver>(context); }
-    explicit FormatRowOverloadResolver(const Context & context_) : context(context_) { }
+    static FunctionOverloadResolverImplPtr create(ContextPtr context) { return std::make_unique<FormatRowOverloadResolver>(context); }
+    explicit FormatRowOverloadResolver(ContextPtr context_) : context(context_) { }
     String getName() const override { return name; }
     bool isVariadic() const override { return true; }
     size_t getNumberOfArguments() const override { return 0; }
@@ -111,7 +111,7 @@ public:
     DataTypePtr getReturnType(const DataTypes &) const override { return std::make_shared<DataTypeString>(); }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/formatString.cpp b/src/Functions/formatString.cpp
index c97692bcb10..aac9d74904d 100644
--- a/src/Functions/formatString.cpp
+++ b/src/Functions/formatString.cpp
@@ -31,7 +31,7 @@ class FormatFunction : public IFunction
 public:
     static constexpr auto name = Name::name;
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FormatFunction>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FormatFunction>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/fromModifiedJulianDay.cpp b/src/Functions/fromModifiedJulianDay.cpp
index cd5699bfac5..3cf5f9b2216 100644
--- a/src/Functions/fromModifiedJulianDay.cpp
+++ b/src/Functions/fromModifiedJulianDay.cpp
@@ -151,7 +151,7 @@ namespace DB
     public:
         static constexpr auto name = Name::name;
 
-        static FunctionOverloadResolverImplPtr create(const Context &)
+        static FunctionOverloadResolverImplPtr create(ContextPtr)
         {
             return std::make_unique<FromModifiedJulianDayOverloadResolver<Name, nullOnErrors>>();
         }
diff --git a/src/Functions/fuzzBits.cpp b/src/Functions/fuzzBits.cpp
index a0631084742..eadaa0aad01 100644
--- a/src/Functions/fuzzBits.cpp
+++ b/src/Functions/fuzzBits.cpp
@@ -53,7 +53,7 @@ class FunctionFuzzBits : public IFunction
 public:
     static constexpr auto name = "fuzzBits";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionFuzzBits>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionFuzzBits>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/generateUUIDv4.cpp b/src/Functions/generateUUIDv4.cpp
index e519f5217b5..a1e50e3c54f 100644
--- a/src/Functions/generateUUIDv4.cpp
+++ b/src/Functions/generateUUIDv4.cpp
@@ -59,7 +59,7 @@ public:
 class FunctionGenerateUUIDv4 : public TargetSpecific::Default::FunctionGenerateUUIDv4
 {
 public:
-    explicit FunctionGenerateUUIDv4(const Context & context) : selector(context)
+    explicit FunctionGenerateUUIDv4(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             TargetSpecific::Default::FunctionGenerateUUIDv4>();
@@ -75,7 +75,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionGenerateUUIDv4>(context);
     }
diff --git a/src/Functions/geoToH3.cpp b/src/Functions/geoToH3.cpp
index 6518043d15f..7b3d742bb60 100644
--- a/src/Functions/geoToH3.cpp
+++ b/src/Functions/geoToH3.cpp
@@ -33,7 +33,7 @@ class FunctionGeoToH3 : public IFunction
 public:
     static constexpr auto name = "geoToH3";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionGeoToH3>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeoToH3>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/geohashDecode.cpp b/src/Functions/geohashDecode.cpp
index 7e73b501bd5..bf774905868 100644
--- a/src/Functions/geohashDecode.cpp
+++ b/src/Functions/geohashDecode.cpp
@@ -27,7 +27,7 @@ class FunctionGeohashDecode : public IFunction
 {
 public:
     static constexpr auto name = "geohashDecode";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionGeohashDecode>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeohashDecode>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/geohashEncode.cpp b/src/Functions/geohashEncode.cpp
index 794e77b4e24..15abe96e3e5 100644
--- a/src/Functions/geohashEncode.cpp
+++ b/src/Functions/geohashEncode.cpp
@@ -28,7 +28,7 @@ class FunctionGeohashEncode : public IFunction
 {
 public:
     static constexpr auto name = "geohashEncode";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionGeohashEncode>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeohashEncode>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/geohashesInBox.cpp b/src/Functions/geohashesInBox.cpp
index 0e18916053f..6bcae5c2440 100644
--- a/src/Functions/geohashesInBox.cpp
+++ b/src/Functions/geohashesInBox.cpp
@@ -29,7 +29,7 @@ class FunctionGeohashesInBox : public IFunction
 {
 public:
     static constexpr auto name = "geohashesInBox";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionGeohashesInBox>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionGeohashesInBox>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/getMacro.cpp b/src/Functions/getMacro.cpp
index 949016d862d..7fe41498d35 100644
--- a/src/Functions/getMacro.cpp
+++ b/src/Functions/getMacro.cpp
@@ -30,9 +30,9 @@ private:
 
 public:
     static constexpr auto name = "getMacro";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionGetMacro>(context.getMacros());
+        return std::make_shared<FunctionGetMacro>(context->getMacros());
     }
 
     explicit FunctionGetMacro(MultiVersion<Macros>::Version macros_) : macros(std::move(macros_)) {}
diff --git a/src/Functions/getScalar.cpp b/src/Functions/getScalar.cpp
index 4803c5a81d5..5520be9d9c2 100644
--- a/src/Functions/getScalar.cpp
+++ b/src/Functions/getScalar.cpp
@@ -20,16 +20,16 @@ namespace
 
 /** Get scalar value of sub queries from query context via IAST::Hash.
   */
-class FunctionGetScalar : public IFunction
+class FunctionGetScalar : public IFunction, WithContext
 {
 public:
     static constexpr auto name = "__getScalar";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context_)
     {
-        return std::make_shared<FunctionGetScalar>(context);
+        return std::make_shared<FunctionGetScalar>(context_);
     }
 
-    explicit FunctionGetScalar(const Context & context_) : context(context_) {}
+    explicit FunctionGetScalar(ContextPtr context_) : WithContext(context_) {}
 
     String getName() const override
     {
@@ -46,8 +46,8 @@ public:
         if (arguments.size() != 1 || !isString(arguments[0].type) || !arguments[0].column || !isColumnConst(*arguments[0].column))
             throw Exception("Function " + getName() + " accepts one const string argument", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
         auto scalar_name = assert_cast<const ColumnConst &>(*arguments[0].column).getValue<String>();
-        const Context & query_context = context.hasQueryContext() ? context.getQueryContext() : context;
-        scalar = query_context.getScalar(scalar_name).getByPosition(0);
+        ContextPtr query_context = getContext()->hasQueryContext() ? getContext()->getQueryContext() : getContext();
+        scalar = query_context->getScalar(scalar_name).getByPosition(0);
         return scalar.type;
     }
 
@@ -58,7 +58,6 @@ public:
 
 private:
     mutable ColumnWithTypeAndName scalar;
-    const Context & context;
 };
 
 }
diff --git a/src/Functions/getSetting.cpp b/src/Functions/getSetting.cpp
index 5da5f902d8c..6494f42c53c 100644
--- a/src/Functions/getSetting.cpp
+++ b/src/Functions/getSetting.cpp
@@ -19,13 +19,13 @@ namespace
 {
 
 /// Get the value of a setting.
-class FunctionGetSetting : public IFunction
+class FunctionGetSetting : public IFunction, WithContext
 {
 public:
     static constexpr auto name = "getSetting";
 
-    static FunctionPtr create(const Context & context_) { return std::make_shared<FunctionGetSetting>(context_); }
-    explicit FunctionGetSetting(const Context & context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context_) { return std::make_shared<FunctionGetSetting>(context_); }
+    explicit FunctionGetSetting(ContextPtr context_) : WithContext(context_) {}
 
     String getName() const override { return name; }
     bool isDeterministic() const override { return false; }
@@ -43,7 +43,7 @@ public:
                             ErrorCodes::ILLEGAL_COLUMN};
 
         std::string_view setting_name{column->getDataAt(0)};
-        value = context.getSettingsRef().get(setting_name);
+        value = getContext()->getSettingsRef().get(setting_name);
 
         DataTypePtr type = applyVisitor(FieldToDataType{}, value);
         value = convertFieldToType(value, *type);
@@ -57,7 +57,6 @@ public:
 
 private:
     mutable Field value;
-    const Context & context;
 };
 
 }
diff --git a/src/Functions/getSizeOfEnumType.cpp b/src/Functions/getSizeOfEnumType.cpp
index dea56bd3063..9499b0e3bf0 100644
--- a/src/Functions/getSizeOfEnumType.cpp
+++ b/src/Functions/getSizeOfEnumType.cpp
@@ -20,7 +20,7 @@ class FunctionGetSizeOfEnumType : public IFunction
 {
 public:
     static constexpr auto name = "getSizeOfEnumType";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionGetSizeOfEnumType>();
     }
diff --git a/src/Functions/globalVariable.cpp b/src/Functions/globalVariable.cpp
index 6482b3bb976..9f3c89b16e2 100644
--- a/src/Functions/globalVariable.cpp
+++ b/src/Functions/globalVariable.cpp
@@ -30,7 +30,7 @@ class FunctionGlobalVariable : public IFunction
 {
 public:
     static constexpr auto name = "globalVariable";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionGlobalVariable>();
     }
diff --git a/src/Functions/greatCircleDistance.cpp b/src/Functions/greatCircleDistance.cpp
index 801f8b3da7f..93ec7c9de4c 100644
--- a/src/Functions/greatCircleDistance.cpp
+++ b/src/Functions/greatCircleDistance.cpp
@@ -287,7 +287,7 @@ template <Method method>
 class FunctionGeoDistance : public TargetSpecific::Default::FunctionGeoDistance<method>
 {
 public:
-    explicit FunctionGeoDistance(const Context & context) : selector(context)
+    explicit FunctionGeoDistance(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             TargetSpecific::Default::FunctionGeoDistance<method>>();
@@ -307,7 +307,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionGeoDistance<method>>(context);
     }
diff --git a/src/Functions/h3EdgeAngle.cpp b/src/Functions/h3EdgeAngle.cpp
index 58ce5def111..ad8d1ee441f 100644
--- a/src/Functions/h3EdgeAngle.cpp
+++ b/src/Functions/h3EdgeAngle.cpp
@@ -32,7 +32,7 @@ class FunctionH3EdgeAngle : public IFunction
 public:
     static constexpr auto name = "h3EdgeAngle";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3EdgeAngle>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3EdgeAngle>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3EdgeLengthM.cpp b/src/Functions/h3EdgeLengthM.cpp
index 8f8aebc857e..85d307e1da3 100644
--- a/src/Functions/h3EdgeLengthM.cpp
+++ b/src/Functions/h3EdgeLengthM.cpp
@@ -37,7 +37,7 @@ class FunctionH3EdgeLengthM : public IFunction
 public:
     static constexpr auto name = "h3EdgeLengthM";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3EdgeLengthM>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3EdgeLengthM>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3GetBaseCell.cpp b/src/Functions/h3GetBaseCell.cpp
index 92d9ee5e3e0..fcad82098e6 100644
--- a/src/Functions/h3GetBaseCell.cpp
+++ b/src/Functions/h3GetBaseCell.cpp
@@ -29,7 +29,7 @@ class FunctionH3GetBaseCell : public IFunction
 public:
     static constexpr auto name = "h3GetBaseCell";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3GetBaseCell>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3GetBaseCell>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3GetResolution.cpp b/src/Functions/h3GetResolution.cpp
index f2676ccbb82..d1bfd899150 100644
--- a/src/Functions/h3GetResolution.cpp
+++ b/src/Functions/h3GetResolution.cpp
@@ -29,7 +29,7 @@ class FunctionH3GetResolution : public IFunction
 public:
     static constexpr auto name = "h3GetResolution";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3GetResolution>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3GetResolution>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3HexAreaM2.cpp b/src/Functions/h3HexAreaM2.cpp
index c7a16b57465..e44bf660333 100644
--- a/src/Functions/h3HexAreaM2.cpp
+++ b/src/Functions/h3HexAreaM2.cpp
@@ -32,7 +32,7 @@ class FunctionH3HexAreaM2 : public IFunction
 public:
     static constexpr auto name = "h3HexAreaM2";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3HexAreaM2>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3HexAreaM2>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3IndexesAreNeighbors.cpp b/src/Functions/h3IndexesAreNeighbors.cpp
index d43fca15012..56c69ed0a8b 100644
--- a/src/Functions/h3IndexesAreNeighbors.cpp
+++ b/src/Functions/h3IndexesAreNeighbors.cpp
@@ -29,7 +29,7 @@ class FunctionH3IndexesAreNeighbors : public IFunction
 public:
     static constexpr auto name = "h3IndexesAreNeighbors";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3IndexesAreNeighbors>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3IndexesAreNeighbors>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3IsValid.cpp b/src/Functions/h3IsValid.cpp
index 2918431e3b6..1e4840b3537 100644
--- a/src/Functions/h3IsValid.cpp
+++ b/src/Functions/h3IsValid.cpp
@@ -29,7 +29,7 @@ class FunctionH3IsValid : public IFunction
 public:
     static constexpr auto name = "h3IsValid";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3IsValid>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3IsValid>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3ToChildren.cpp b/src/Functions/h3ToChildren.cpp
index b63d4efc83e..9730aefe3d4 100644
--- a/src/Functions/h3ToChildren.cpp
+++ b/src/Functions/h3ToChildren.cpp
@@ -38,7 +38,7 @@ class FunctionH3ToChildren : public IFunction
 public:
     static constexpr auto name = "h3ToChildren";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3ToChildren>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3ToChildren>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3ToParent.cpp b/src/Functions/h3ToParent.cpp
index 73c1d002df5..4baf9527301 100644
--- a/src/Functions/h3ToParent.cpp
+++ b/src/Functions/h3ToParent.cpp
@@ -32,7 +32,7 @@ class FunctionH3ToParent : public IFunction
 public:
     static constexpr auto name = "h3ToParent";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3ToParent>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3ToParent>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3ToString.cpp b/src/Functions/h3ToString.cpp
index 16d7d14964a..dcd0951f67f 100644
--- a/src/Functions/h3ToString.cpp
+++ b/src/Functions/h3ToString.cpp
@@ -29,7 +29,7 @@ class FunctionH3ToString : public IFunction
 public:
     static constexpr auto name = "h3ToString";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3ToString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3ToString>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/h3kRing.cpp b/src/Functions/h3kRing.cpp
index fd4a8ac57e8..40e73f9dea2 100644
--- a/src/Functions/h3kRing.cpp
+++ b/src/Functions/h3kRing.cpp
@@ -35,7 +35,7 @@ class FunctionH3KRing : public IFunction
 public:
     static constexpr auto name = "h3kRing";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionH3KRing>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionH3KRing>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/hasColumnInTable.cpp b/src/Functions/hasColumnInTable.cpp
index d5fe00e025f..28f83a63386 100644
--- a/src/Functions/hasColumnInTable.cpp
+++ b/src/Functions/hasColumnInTable.cpp
@@ -25,16 +25,16 @@ namespace
 /** Usage:
  *  hasColumnInTable(['hostname'[, 'username'[, 'password']],] 'database', 'table', 'column')
  */
-class FunctionHasColumnInTable : public IFunction
+class FunctionHasColumnInTable : public IFunction, WithContext
 {
 public:
     static constexpr auto name = "hasColumnInTable";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context_)
     {
-        return std::make_shared<FunctionHasColumnInTable>(context.getGlobalContext());
+        return std::make_shared<FunctionHasColumnInTable>(context_->getGlobalContext());
     }
 
-    explicit FunctionHasColumnInTable(const Context & global_context_) : global_context(global_context_)
+    explicit FunctionHasColumnInTable(ContextPtr global_context_) : WithContext(global_context_)
     {
     }
 
@@ -57,9 +57,6 @@ public:
     bool isDeterministic() const override { return false; }
 
     ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override;
-
-private:
-    const Context & global_context;
 };
 
 
@@ -117,7 +114,7 @@ ColumnPtr FunctionHasColumnInTable::executeImpl(const ColumnsWithTypeAndName & a
     bool has_column;
     if (host_name.empty())
     {
-        const StoragePtr & table = DatabaseCatalog::instance().getTable({database_name, table_name}, global_context);
+        const StoragePtr & table = DatabaseCatalog::instance().getTable({database_name, table_name}, getContext());
         auto table_metadata = table->getInMemoryMetadataPtr();
         has_column = table_metadata->getColumns().hasPhysical(column_name);
     }
@@ -126,14 +123,14 @@ ColumnPtr FunctionHasColumnInTable::executeImpl(const ColumnsWithTypeAndName & a
         std::vector<std::vector<String>> host_names = {{ host_name }};
 
         auto cluster = std::make_shared<Cluster>(
-            global_context.getSettings(),
+            getContext()->getSettings(),
             host_names,
             !user_name.empty() ? user_name : "default",
             password,
-            global_context.getTCPPort(),
+            getContext()->getTCPPort(),
             false);
 
-        auto remote_columns = getStructureOfRemoteTable(*cluster, {database_name, table_name}, global_context);
+        auto remote_columns = getStructureOfRemoteTable(*cluster, {database_name, table_name}, getContext());
         has_column = remote_columns.hasPhysical(column_name);
     }
 
diff --git a/src/Functions/hasThreadFuzzer.cpp b/src/Functions/hasThreadFuzzer.cpp
index 545ac0175f2..e9b48aa70f9 100644
--- a/src/Functions/hasThreadFuzzer.cpp
+++ b/src/Functions/hasThreadFuzzer.cpp
@@ -16,7 +16,7 @@ class FunctionHasThreadFuzzer : public IFunction
 {
 public:
     static constexpr auto name = "hasThreadFuzzer";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionHasThreadFuzzer>();
     }
diff --git a/src/Functions/hostName.cpp b/src/Functions/hostName.cpp
index beaaec37e70..250c410aa9c 100644
--- a/src/Functions/hostName.cpp
+++ b/src/Functions/hostName.cpp
@@ -15,7 +15,7 @@ class FunctionHostName : public IFunction
 {
 public:
     static constexpr auto name = "hostName";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionHostName>();
     }
diff --git a/src/Functions/identity.cpp b/src/Functions/identity.cpp
index cb8fcf28c23..2bfeb4cdda3 100644
--- a/src/Functions/identity.cpp
+++ b/src/Functions/identity.cpp
@@ -11,7 +11,7 @@ class FunctionIdentity : public IFunction
 {
 public:
     static constexpr auto name = "identity";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIdentity>();
     }
diff --git a/src/Functions/if.cpp b/src/Functions/if.cpp
index 614bfcf700e..4883b827d7d 100644
--- a/src/Functions/if.cpp
+++ b/src/Functions/if.cpp
@@ -173,7 +173,7 @@ class FunctionIf : public FunctionIfBase</*null_is_false=*/false>
 {
 public:
     static constexpr auto name = "if";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionIf>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIf>(); }
 
 private:
     template <typename T0, typename T1>
diff --git a/src/Functions/ifNotFinite.cpp b/src/Functions/ifNotFinite.cpp
index 88b23da0126..8a80fbc82ee 100644
--- a/src/Functions/ifNotFinite.cpp
+++ b/src/Functions/ifNotFinite.cpp
@@ -17,9 +17,9 @@ class FunctionIfNotFinite : public IFunction
 public:
     static constexpr auto name = "ifNotFinite";
 
-    explicit FunctionIfNotFinite(const Context & context_) : context(context_) {}
+    explicit FunctionIfNotFinite(ContextPtr context_) : context(context_) {}
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionIfNotFinite>(context);
     }
@@ -59,7 +59,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/ifNull.cpp b/src/Functions/ifNull.cpp
index af29fa0e1f0..763d125a8b7 100644
--- a/src/Functions/ifNull.cpp
+++ b/src/Functions/ifNull.cpp
@@ -21,9 +21,9 @@ class FunctionIfNull : public IFunction
 public:
     static constexpr auto name = "ifNull";
 
-    explicit FunctionIfNull(const Context & context_) : context(context_) {}
+    explicit FunctionIfNull(ContextPtr context_) : context(context_) {}
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionIfNull>(context);
     }
@@ -83,7 +83,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/ignore.cpp b/src/Functions/ignore.cpp
index 1348144cb05..1a8a838036c 100644
--- a/src/Functions/ignore.cpp
+++ b/src/Functions/ignore.cpp
@@ -14,7 +14,7 @@ class FunctionIgnore : public IFunction
 {
 public:
     static constexpr auto name = "ignore";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIgnore>();
     }
diff --git a/src/Functions/in.cpp b/src/Functions/in.cpp
index b9a0c81b508..aac8de14fe6 100644
--- a/src/Functions/in.cpp
+++ b/src/Functions/in.cpp
@@ -52,7 +52,7 @@ public:
     /// It is needed to perform type analysis without creation of set.
     static constexpr auto name = FunctionInName<negative, global, null_is_skipped, ignore_set>::name;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIn>();
     }
diff --git a/src/Functions/initializeAggregation.cpp b/src/Functions/initializeAggregation.cpp
index 76a885fd730..75c3ea14de8 100644
--- a/src/Functions/initializeAggregation.cpp
+++ b/src/Functions/initializeAggregation.cpp
@@ -29,7 +29,7 @@ class FunctionInitializeAggregation : public IFunction
 {
 public:
     static constexpr auto name = "initializeAggregation";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionInitializeAggregation>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionInitializeAggregation>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/isConstant.cpp b/src/Functions/isConstant.cpp
index 09e14226b70..12514b71a11 100644
--- a/src/Functions/isConstant.cpp
+++ b/src/Functions/isConstant.cpp
@@ -15,7 +15,7 @@ class FunctionIsConstant : public IFunction
 {
 public:
     static constexpr auto name = "isConstant";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIsConstant>();
     }
diff --git a/src/Functions/isDecimalOverflow.cpp b/src/Functions/isDecimalOverflow.cpp
index 9104b1f1dee..16d6752e6a5 100644
--- a/src/Functions/isDecimalOverflow.cpp
+++ b/src/Functions/isDecimalOverflow.cpp
@@ -28,7 +28,7 @@ class FunctionIsDecimalOverflow : public IFunction
 public:
     static constexpr auto name = "isDecimalOverflow";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIsDecimalOverflow>();
     }
diff --git a/src/Functions/isIPAddressContainedIn.cpp b/src/Functions/isIPAddressContainedIn.cpp
index d31e03cb63e..fb5b8a3271d 100644
--- a/src/Functions/isIPAddressContainedIn.cpp
+++ b/src/Functions/isIPAddressContainedIn.cpp
@@ -125,7 +125,7 @@ namespace DB
     public:
         static constexpr auto name = "isIPAddressInRange";
         String getName() const override { return name; }
-        static FunctionPtr create(const Context &) { return std::make_shared<FunctionIsIPAddressContainedIn>(); }
+        static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionIsIPAddressContainedIn>(); }
 
         ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & /* return_type */, size_t input_rows_count) const override
         {
diff --git a/src/Functions/isNotNull.cpp b/src/Functions/isNotNull.cpp
index 104547ac485..0ba240833f5 100644
--- a/src/Functions/isNotNull.cpp
+++ b/src/Functions/isNotNull.cpp
@@ -19,7 +19,7 @@ class FunctionIsNotNull : public IFunction
 public:
     static constexpr auto name = "isNotNull";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIsNotNull>();
     }
diff --git a/src/Functions/isNull.cpp b/src/Functions/isNull.cpp
index 35ba6b7b86d..142403aedf8 100644
--- a/src/Functions/isNull.cpp
+++ b/src/Functions/isNull.cpp
@@ -18,7 +18,7 @@ class FunctionIsNull : public IFunction
 public:
     static constexpr auto name = "isNull";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIsNull>();
     }
diff --git a/src/Functions/isZeroOrNull.cpp b/src/Functions/isZeroOrNull.cpp
index ceaa03dee14..d1fd950c22c 100644
--- a/src/Functions/isZeroOrNull.cpp
+++ b/src/Functions/isZeroOrNull.cpp
@@ -26,7 +26,7 @@ class FunctionIsZeroOrNull : public IFunction
 public:
     static constexpr auto name = "isZeroOrNull";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionIsZeroOrNull>();
     }
diff --git a/src/Functions/logTrace.cpp b/src/Functions/logTrace.cpp
index 6f2719588f2..a56d9ef5de1 100644
--- a/src/Functions/logTrace.cpp
+++ b/src/Functions/logTrace.cpp
@@ -21,7 +21,7 @@ namespace
     {
     public:
         static constexpr auto name = "logTrace";
-        static FunctionPtr create(const Context &) { return std::make_shared<FunctionLogTrace>(); }
+        static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionLogTrace>(); }
 
         String getName() const override { return name; }
 
diff --git a/src/Functions/lowCardinalityIndices.cpp b/src/Functions/lowCardinalityIndices.cpp
index 67bee2f0d3f..25834b2b3a8 100644
--- a/src/Functions/lowCardinalityIndices.cpp
+++ b/src/Functions/lowCardinalityIndices.cpp
@@ -21,7 +21,7 @@ class FunctionLowCardinalityIndices: public IFunction
 {
 public:
     static constexpr auto name = "lowCardinalityIndices";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionLowCardinalityIndices>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionLowCardinalityIndices>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/lowCardinalityKeys.cpp b/src/Functions/lowCardinalityKeys.cpp
index a7cb6b45550..5bcc2429592 100644
--- a/src/Functions/lowCardinalityKeys.cpp
+++ b/src/Functions/lowCardinalityKeys.cpp
@@ -19,7 +19,7 @@ class FunctionLowCardinalityKeys: public IFunction
 {
 public:
     static constexpr auto name = "lowCardinalityKeys";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionLowCardinalityKeys>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionLowCardinalityKeys>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/map.cpp b/src/Functions/map.cpp
index 7418691e61b..d2ec10abd1c 100644
--- a/src/Functions/map.cpp
+++ b/src/Functions/map.cpp
@@ -34,7 +34,7 @@ class FunctionMap : public IFunction
 public:
     static constexpr auto name = "map";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionMap>();
     }
@@ -146,7 +146,7 @@ class FunctionMapContains : public IFunction
 {
 public:
     static constexpr auto name = NameMapContains::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMapContains>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMapContains>(); }
 
     String getName() const override
     {
@@ -209,7 +209,7 @@ class FunctionMapKeys : public IFunction
 {
 public:
     static constexpr auto name = "mapKeys";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMapKeys>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMapKeys>(); }
 
     String getName() const override
     {
@@ -256,7 +256,7 @@ class FunctionMapValues : public IFunction
 {
 public:
     static constexpr auto name = "mapValues";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMapValues>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMapValues>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/materialize.h b/src/Functions/materialize.h
index 5b06ac36da7..741669e69d9 100644
--- a/src/Functions/materialize.h
+++ b/src/Functions/materialize.h
@@ -11,7 +11,7 @@ class FunctionMaterialize : public IFunction
 {
 public:
     static constexpr auto name = "materialize";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionMaterialize>();
     }
diff --git a/src/Functions/multiIf.cpp b/src/Functions/multiIf.cpp
index 8ca92954873..d9be4512851 100644
--- a/src/Functions/multiIf.cpp
+++ b/src/Functions/multiIf.cpp
@@ -35,7 +35,7 @@ class FunctionMultiIf final : public FunctionIfBase</*null_is_false=*/true>
 {
 public:
     static constexpr auto name = "multiIf";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionMultiIf>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionMultiIf>(); }
 
     String getName() const override { return name; }
     bool isVariadic() const override { return true; }
diff --git a/src/Functions/neighbor.cpp b/src/Functions/neighbor.cpp
index 598e1225877..e841fe9e79b 100644
--- a/src/Functions/neighbor.cpp
+++ b/src/Functions/neighbor.cpp
@@ -31,7 +31,7 @@ class FunctionNeighbor : public IFunction
 {
 public:
     static constexpr auto name = "neighbor";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionNeighbor>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionNeighbor>(); }
 
     /// Get the name of the function.
     String getName() const override { return name; }
diff --git a/src/Functions/normalizedQueryHash.cpp b/src/Functions/normalizedQueryHash.cpp
index 5704b5301ca..e08680518c1 100644
--- a/src/Functions/normalizedQueryHash.cpp
+++ b/src/Functions/normalizedQueryHash.cpp
@@ -51,7 +51,7 @@ class FunctionNormalizedQueryHash : public IFunction
 {
 public:
     static constexpr auto name = keep_names ? "normalizedQueryHashKeepNames" : "normalizedQueryHash";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionNormalizedQueryHash>();
     }
diff --git a/src/Functions/now.cpp b/src/Functions/now.cpp
index 79870ace007..8d7c185c2af 100644
--- a/src/Functions/now.cpp
+++ b/src/Functions/now.cpp
@@ -83,7 +83,7 @@ public:
     bool isVariadic() const override { return true; }
 
     size_t getNumberOfArguments() const override { return 0; }
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<NowOverloadResolver>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<NowOverloadResolver>(); }
 
     DataTypePtr getReturnType(const ColumnsWithTypeAndName & arguments) const override
     {
diff --git a/src/Functions/now64.cpp b/src/Functions/now64.cpp
index 32c7a95de17..503ce524437 100644
--- a/src/Functions/now64.cpp
+++ b/src/Functions/now64.cpp
@@ -106,7 +106,7 @@ public:
     bool isVariadic() const override { return true; }
 
     size_t getNumberOfArguments() const override { return 0; }
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<Now64OverloadResolver>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<Now64OverloadResolver>(); }
 
     DataTypePtr getReturnType(const ColumnsWithTypeAndName & arguments) const override
     {
diff --git a/src/Functions/nullIf.cpp b/src/Functions/nullIf.cpp
index 200425a7b83..332f85f918f 100644
--- a/src/Functions/nullIf.cpp
+++ b/src/Functions/nullIf.cpp
@@ -18,16 +18,16 @@ namespace
 class FunctionNullIf : public IFunction
 {
 private:
-    const Context & context;
+    ContextPtr context;
 public:
     static constexpr auto name = "nullIf";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionNullIf>(context);
     }
 
-    explicit FunctionNullIf(const Context & context_) : context(context_) {}
+    explicit FunctionNullIf(ContextPtr context_) : context(context_) {}
 
     std::string getName() const override
     {
diff --git a/src/Functions/partitionId.cpp b/src/Functions/partitionId.cpp
index 39d6f1aff84..f501b120740 100644
--- a/src/Functions/partitionId.cpp
+++ b/src/Functions/partitionId.cpp
@@ -23,7 +23,7 @@ class FunctionPartitionId : public IFunction
 public:
     static constexpr auto name = "partitionId";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionPartitionId>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionPartitionId>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/pointInEllipses.cpp b/src/Functions/pointInEllipses.cpp
index 4edd400d55d..eed564ef988 100644
--- a/src/Functions/pointInEllipses.cpp
+++ b/src/Functions/pointInEllipses.cpp
@@ -39,7 +39,7 @@ class FunctionPointInEllipses : public IFunction
 {
 public:
     static constexpr auto name = "pointInEllipses";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionPointInEllipses>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionPointInEllipses>(); }
 
 private:
 
diff --git a/src/Functions/pointInPolygon.cpp b/src/Functions/pointInPolygon.cpp
index 8e4a05bdec5..842a5010190 100644
--- a/src/Functions/pointInPolygon.cpp
+++ b/src/Functions/pointInPolygon.cpp
@@ -60,10 +60,10 @@ public:
 
     explicit FunctionPointInPolygon(bool validate_) : validate(validate_) {}
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionPointInPolygon<PointInConstPolygonImpl>>(
-            context.getSettingsRef().validate_polygons);
+            context->getSettingsRef().validate_polygons);
     }
 
     String getName() const override
diff --git a/src/Functions/polygonArea.cpp b/src/Functions/polygonArea.cpp
index 7de0869609e..9a36b71d5b1 100644
--- a/src/Functions/polygonArea.cpp
+++ b/src/Functions/polygonArea.cpp
@@ -34,7 +34,7 @@ public:
 
     explicit FunctionPolygonArea() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonArea>();
     }
diff --git a/src/Functions/polygonConvexHull.cpp b/src/Functions/polygonConvexHull.cpp
index f445b4e4072..5bce3c5bbdd 100644
--- a/src/Functions/polygonConvexHull.cpp
+++ b/src/Functions/polygonConvexHull.cpp
@@ -33,7 +33,7 @@ public:
 
     explicit FunctionPolygonConvexHull() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonConvexHull>();
     }
diff --git a/src/Functions/polygonPerimeter.cpp b/src/Functions/polygonPerimeter.cpp
index e361fa2a387..5a6e293630e 100644
--- a/src/Functions/polygonPerimeter.cpp
+++ b/src/Functions/polygonPerimeter.cpp
@@ -33,7 +33,7 @@ public:
 
     explicit FunctionPolygonPerimeter() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonPerimeter>();
     }
diff --git a/src/Functions/polygonsDistance.cpp b/src/Functions/polygonsDistance.cpp
index 074fb5a9798..d6c4ff36e4d 100644
--- a/src/Functions/polygonsDistance.cpp
+++ b/src/Functions/polygonsDistance.cpp
@@ -35,7 +35,7 @@ public:
 
     explicit FunctionPolygonsDistance() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsDistance>();
     }
diff --git a/src/Functions/polygonsEquals.cpp b/src/Functions/polygonsEquals.cpp
index 12f4cf09fa5..9e2902d0528 100644
--- a/src/Functions/polygonsEquals.cpp
+++ b/src/Functions/polygonsEquals.cpp
@@ -34,7 +34,7 @@ public:
 
     explicit FunctionPolygonsEquals() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsEquals>();
     }
diff --git a/src/Functions/polygonsIntersection.cpp b/src/Functions/polygonsIntersection.cpp
index 8eaf6b97b2b..699488abab1 100644
--- a/src/Functions/polygonsIntersection.cpp
+++ b/src/Functions/polygonsIntersection.cpp
@@ -34,7 +34,7 @@ public:
 
     explicit FunctionPolygonsIntersection() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsIntersection>();
     }
diff --git a/src/Functions/polygonsSymDifference.cpp b/src/Functions/polygonsSymDifference.cpp
index a7bdf0af32f..129e553f060 100644
--- a/src/Functions/polygonsSymDifference.cpp
+++ b/src/Functions/polygonsSymDifference.cpp
@@ -34,7 +34,7 @@ public:
 
     explicit FunctionPolygonsSymDifference() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsSymDifference>();
     }
diff --git a/src/Functions/polygonsUnion.cpp b/src/Functions/polygonsUnion.cpp
index 834629f90ad..e7281c299d0 100644
--- a/src/Functions/polygonsUnion.cpp
+++ b/src/Functions/polygonsUnion.cpp
@@ -34,7 +34,7 @@ public:
 
     explicit FunctionPolygonsUnion() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsUnion>();
     }
diff --git a/src/Functions/polygonsWithin.cpp b/src/Functions/polygonsWithin.cpp
index 68db1494a0d..2fd5b7e2225 100644
--- a/src/Functions/polygonsWithin.cpp
+++ b/src/Functions/polygonsWithin.cpp
@@ -36,7 +36,7 @@ public:
 
     explicit FunctionPolygonsWithin() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionPolygonsWithin>();
     }
diff --git a/src/Functions/randConstant.cpp b/src/Functions/randConstant.cpp
index acc178ae974..f1164beda8d 100644
--- a/src/Functions/randConstant.cpp
+++ b/src/Functions/randConstant.cpp
@@ -79,7 +79,7 @@ public:
     bool isVariadic() const override { return true; }
     size_t getNumberOfArguments() const override { return 0; }
 
-    static FunctionOverloadResolverImplPtr create(const Context &)
+    static FunctionOverloadResolverImplPtr create(ContextPtr)
     {
         return std::make_unique<RandomConstantOverloadResolver<ToType, Name>>();
     }
diff --git a/src/Functions/randomFixedString.cpp b/src/Functions/randomFixedString.cpp
index 2e493ddb43d..b358fc72ba6 100644
--- a/src/Functions/randomFixedString.cpp
+++ b/src/Functions/randomFixedString.cpp
@@ -77,7 +77,7 @@ public:
 class FunctionRandomFixedString : public FunctionRandomFixedStringImpl<TargetSpecific::Default::RandImpl>
 {
 public:
-    explicit FunctionRandomFixedString(const Context & context) : selector(context)
+    explicit FunctionRandomFixedString(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             FunctionRandomFixedStringImpl<TargetSpecific::Default::RandImpl>>();
@@ -93,7 +93,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionRandomFixedString>(context);
     }
diff --git a/src/Functions/randomPrintableASCII.cpp b/src/Functions/randomPrintableASCII.cpp
index ce7f809c151..c70163b237d 100644
--- a/src/Functions/randomPrintableASCII.cpp
+++ b/src/Functions/randomPrintableASCII.cpp
@@ -27,7 +27,7 @@ class FunctionRandomPrintableASCII : public IFunction
 {
 public:
     static constexpr auto name = "randomPrintableASCII";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRandomPrintableASCII>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRandomPrintableASCII>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/randomString.cpp b/src/Functions/randomString.cpp
index f51a75c0422..4cc108b1afe 100644
--- a/src/Functions/randomString.cpp
+++ b/src/Functions/randomString.cpp
@@ -97,7 +97,7 @@ public:
 class FunctionRandomString : public FunctionRandomStringImpl<TargetSpecific::Default::RandImpl>
 {
 public:
-    explicit FunctionRandomString(const Context & context) : selector(context)
+    explicit FunctionRandomString(ContextPtr context) : selector(context)
     {
         selector.registerImplementation<TargetArch::Default,
             FunctionRandomStringImpl<TargetSpecific::Default::RandImpl>>();
@@ -113,7 +113,7 @@ public:
         return selector.selectAndExecute(arguments, result_type, input_rows_count);
     }
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionRandomString>(context);
     }
diff --git a/src/Functions/randomStringUTF8.cpp b/src/Functions/randomStringUTF8.cpp
index 163092226f2..7c19993bfaa 100644
--- a/src/Functions/randomStringUTF8.cpp
+++ b/src/Functions/randomStringUTF8.cpp
@@ -30,7 +30,7 @@ class FunctionRandomStringUTF8 : public IFunction
 public:
     static constexpr auto name = "randomStringUTF8";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRandomStringUTF8>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRandomStringUTF8>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/readWkt.cpp b/src/Functions/readWkt.cpp
index 47312be2aa0..2ce4becb01c 100644
--- a/src/Functions/readWkt.cpp
+++ b/src/Functions/readWkt.cpp
@@ -68,7 +68,7 @@ public:
         return true;
     }
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionReadWkt<DataTypeName, Geometry, Serializer, NameHolder>>();
     }
diff --git a/src/Functions/regexpQuoteMeta.cpp b/src/Functions/regexpQuoteMeta.cpp
index a5ab5166fe3..0f1ec476a3b 100644
--- a/src/Functions/regexpQuoteMeta.cpp
+++ b/src/Functions/regexpQuoteMeta.cpp
@@ -21,7 +21,7 @@ class FunctionRegexpQuoteMeta : public IFunction
 public:
     static constexpr auto name = "regexpQuoteMeta";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionRegexpQuoteMeta>();
     }
diff --git a/src/Functions/reinterpretAs.cpp b/src/Functions/reinterpretAs.cpp
index 3f4ba3d23e1..f8a7b8eec84 100644
--- a/src/Functions/reinterpretAs.cpp
+++ b/src/Functions/reinterpretAs.cpp
@@ -47,7 +47,7 @@ class FunctionReinterpret : public IFunction
 public:
     static constexpr auto name = "reinterpret";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionReinterpret>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionReinterpret>(); }
 
     String getName() const override { return name; }
 
@@ -349,7 +349,7 @@ class FunctionReinterpretAs : public IFunction
 {
 public:
     static constexpr auto name = Name::name;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionReinterpretAs>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionReinterpretAs>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/repeat.cpp b/src/Functions/repeat.cpp
index 29347d6a275..221dc11a43d 100644
--- a/src/Functions/repeat.cpp
+++ b/src/Functions/repeat.cpp
@@ -173,7 +173,7 @@ class FunctionRepeat : public IFunction
 
 public:
     static constexpr auto name = "repeat";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionRepeat>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionRepeat>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/replicate.cpp b/src/Functions/replicate.cpp
index ca391bec6ce..4a452498417 100644
--- a/src/Functions/replicate.cpp
+++ b/src/Functions/replicate.cpp
@@ -4,6 +4,7 @@
 #include <Functions/FunctionHelpers.h>
 #include <DataTypes/DataTypeArray.h>
 #include <Columns/ColumnArray.h>
+#include <Interpreters/Context.h>
 
 
 namespace DB
diff --git a/src/Functions/replicate.h b/src/Functions/replicate.h
index 9a33951b2a3..a778114ffe9 100644
--- a/src/Functions/replicate.h
+++ b/src/Functions/replicate.h
@@ -1,11 +1,11 @@
 #pragma once
+
 #include <Functions/IFunctionImpl.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
 
-class Context;
-
 /// Creates an array, multiplying the column (the first argument) by the number of elements in the array (the second argument).
 /// Function may accept more then two arguments. If so, the first array with non-empty offsets is chosen.
 class FunctionReplicate : public IFunction
@@ -13,7 +13,7 @@ class FunctionReplicate : public IFunction
 public:
     static constexpr auto name = "replicate";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionReplicate>();
     }
diff --git a/src/Functions/reverse.cpp b/src/Functions/reverse.cpp
index 16676eaa936..ec29958dd48 100644
--- a/src/Functions/reverse.cpp
+++ b/src/Functions/reverse.cpp
@@ -57,7 +57,7 @@ class FunctionReverse : public IFunction
 {
 public:
     static constexpr auto name = "reverse";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionReverse>();
     }
@@ -117,9 +117,9 @@ class ReverseOverloadResolver : public IFunctionOverloadResolverImpl
 {
 public:
     static constexpr auto name = "reverse";
-    static FunctionOverloadResolverImplPtr create(const Context & context) { return std::make_unique<ReverseOverloadResolver>(context); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr context) { return std::make_unique<ReverseOverloadResolver>(context); }
 
-    explicit ReverseOverloadResolver(const Context & context_) : context(context_) {}
+    explicit ReverseOverloadResolver(ContextPtr context_) : context(context_) {}
 
     String getName() const override { return name; }
     size_t getNumberOfArguments() const override { return 1; }
@@ -141,7 +141,7 @@ public:
     }
 
 private:
-    const Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Functions/rowNumberInAllBlocks.cpp b/src/Functions/rowNumberInAllBlocks.cpp
index 3aeaade7137..06b6e7c81b0 100644
--- a/src/Functions/rowNumberInAllBlocks.cpp
+++ b/src/Functions/rowNumberInAllBlocks.cpp
@@ -18,7 +18,7 @@ private:
 
 public:
     static constexpr auto name = "rowNumberInAllBlocks";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionRowNumberInAllBlocks>();
     }
diff --git a/src/Functions/rowNumberInBlock.cpp b/src/Functions/rowNumberInBlock.cpp
index 0a5cf63041f..7359a1c5f40 100644
--- a/src/Functions/rowNumberInBlock.cpp
+++ b/src/Functions/rowNumberInBlock.cpp
@@ -13,7 +13,7 @@ class FunctionRowNumberInBlock : public IFunction
 {
 public:
     static constexpr auto name = "rowNumberInBlock";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionRowNumberInBlock>();
     }
diff --git a/src/Functions/runningAccumulate.cpp b/src/Functions/runningAccumulate.cpp
index f3f142bb846..7c1b1f7162e 100644
--- a/src/Functions/runningAccumulate.cpp
+++ b/src/Functions/runningAccumulate.cpp
@@ -33,7 +33,7 @@ class FunctionRunningAccumulate : public IFunction
 {
 public:
     static constexpr auto name = "runningAccumulate";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionRunningAccumulate>();
     }
diff --git a/src/Functions/runningConcurrency.cpp b/src/Functions/runningConcurrency.cpp
index e8be7b9c200..8403fc93c33 100644
--- a/src/Functions/runningConcurrency.cpp
+++ b/src/Functions/runningConcurrency.cpp
@@ -154,7 +154,7 @@ namespace DB
     public:
         static constexpr auto name = Name::name;
 
-        static FunctionOverloadResolverImplPtr create(const Context &)
+        static FunctionOverloadResolverImplPtr create(ContextPtr)
         {
             return std::make_unique<RunningConcurrencyOverloadResolver<Name, ConcurrencyDataType>>();
         }
diff --git a/src/Functions/runningDifference.h b/src/Functions/runningDifference.h
index db32b5f9a3f..4cd53d7b53a 100644
--- a/src/Functions/runningDifference.h
+++ b/src/Functions/runningDifference.h
@@ -124,7 +124,7 @@ private:
 public:
     static constexpr auto name = FunctionRunningDifferenceName<is_first_line_zero>::name;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionRunningDifferenceImpl<is_first_line_zero>>();
     }
diff --git a/src/Functions/sleep.h b/src/Functions/sleep.h
index 65566e36d1f..a3de2d13677 100644
--- a/src/Functions/sleep.h
+++ b/src/Functions/sleep.h
@@ -8,6 +8,7 @@
 #include <Common/assert_cast.h>
 #include <common/sleep.h>
 #include <IO/WriteHelpers.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
@@ -35,7 +36,7 @@ class FunctionSleep : public IFunction
 {
 public:
     static constexpr auto name = variant == FunctionSleepVariant::PerBlock ? "sleep" : "sleepEachRow";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionSleep<variant>>();
     }
diff --git a/src/Functions/stringToH3.cpp b/src/Functions/stringToH3.cpp
index 575382ec40f..9b02711db50 100644
--- a/src/Functions/stringToH3.cpp
+++ b/src/Functions/stringToH3.cpp
@@ -34,7 +34,7 @@ class FunctionStringToH3 : public IFunction
 public:
     static constexpr auto name = "stringToH3";
 
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionStringToH3>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionStringToH3>(); }
 
     std::string getName() const override { return name; }
 
diff --git a/src/Functions/substring.cpp b/src/Functions/substring.cpp
index 3fe82b5e0b0..cac1688c81a 100644
--- a/src/Functions/substring.cpp
+++ b/src/Functions/substring.cpp
@@ -36,7 +36,7 @@ class FunctionSubstring : public IFunction
 {
 public:
     static constexpr auto name = is_utf8 ? "substringUTF8" : "substring";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionSubstring>();
     }
diff --git a/src/Functions/svg.cpp b/src/Functions/svg.cpp
index d8a16af1e1d..39473816c8c 100644
--- a/src/Functions/svg.cpp
+++ b/src/Functions/svg.cpp
@@ -24,7 +24,7 @@ public:
 
     explicit FunctionSvg() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionSvg>();
     }
diff --git a/src/Functions/tcpPort.cpp b/src/Functions/tcpPort.cpp
index 26991c900ab..484843ced3f 100644
--- a/src/Functions/tcpPort.cpp
+++ b/src/Functions/tcpPort.cpp
@@ -14,9 +14,9 @@ class FunctionTcpPort : public IFunction
 public:
     static constexpr auto name = "tcpPort";
 
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionTcpPort>(context.getTCPPort());
+        return std::make_shared<FunctionTcpPort>(context->getTCPPort());
     }
 
     explicit FunctionTcpPort(UInt16 port_) : port(port_)
diff --git a/src/Functions/throwIf.cpp b/src/Functions/throwIf.cpp
index f74ab29186a..d12a90119b9 100644
--- a/src/Functions/throwIf.cpp
+++ b/src/Functions/throwIf.cpp
@@ -26,7 +26,7 @@ class FunctionThrowIf : public IFunction
 {
 public:
     static constexpr auto name = "throwIf";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionThrowIf>();
     }
diff --git a/src/Functions/tid.cpp b/src/Functions/tid.cpp
index 44321deb15f..d5402a00da3 100644
--- a/src/Functions/tid.cpp
+++ b/src/Functions/tid.cpp
@@ -13,7 +13,7 @@ namespace
     {
     public:
         static constexpr auto name = "tid";
-        static FunctionPtr create(const Context &) { return std::make_shared<FunctionTid>(); }
+        static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTid>(); }
 
         String getName() const override { return name; }
 
diff --git a/src/Functions/timeSlots.cpp b/src/Functions/timeSlots.cpp
index ef5902eba11..9af16bf6fe0 100644
--- a/src/Functions/timeSlots.cpp
+++ b/src/Functions/timeSlots.cpp
@@ -109,7 +109,7 @@ class FunctionTimeSlots : public IFunction
 public:
     static constexpr auto name = "timeSlots";
     static constexpr UInt32 TIME_SLOT_SIZE = 1800;
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionTimeSlots>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTimeSlots>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/timezone.cpp b/src/Functions/timezone.cpp
index 2cd0c28612b..178bfe76dc9 100644
--- a/src/Functions/timezone.cpp
+++ b/src/Functions/timezone.cpp
@@ -16,7 +16,7 @@ class FunctionTimezone : public IFunction
 {
 public:
     static constexpr auto name = "timezone";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionTimezone>();
     }
diff --git a/src/Functions/timezoneOf.cpp b/src/Functions/timezoneOf.cpp
index 1d007a6e10e..dd399b8be26 100644
--- a/src/Functions/timezoneOf.cpp
+++ b/src/Functions/timezoneOf.cpp
@@ -82,7 +82,7 @@ class FunctionTimezoneOfBuilder : public IFunctionOverloadResolverImpl
 public:
     static constexpr auto name = "timezoneOf";
     String getName() const override { return name; }
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<FunctionTimezoneOfBuilder>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<FunctionTimezoneOfBuilder>(); }
 
     size_t getNumberOfArguments() const override { return 1; }
 
diff --git a/src/Functions/toColumnTypeName.cpp b/src/Functions/toColumnTypeName.cpp
index 2b59accba84..56b464a0b01 100644
--- a/src/Functions/toColumnTypeName.cpp
+++ b/src/Functions/toColumnTypeName.cpp
@@ -14,7 +14,7 @@ class FunctionToColumnTypeName : public IFunction
 {
 public:
     static constexpr auto name = "toColumnTypeName";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionToColumnTypeName>();
     }
diff --git a/src/Functions/toFixedString.h b/src/Functions/toFixedString.h
index 23c9e92faaf..3911a758a51 100644
--- a/src/Functions/toFixedString.h
+++ b/src/Functions/toFixedString.h
@@ -32,7 +32,7 @@ class FunctionToFixedString : public IFunction
 {
 public:
     static constexpr auto name = "toFixedString";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToFixedString>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToFixedString>(); }
     static FunctionPtr create() { return std::make_shared<FunctionToFixedString>(); }
 
     String getName() const override
diff --git a/src/Functions/toLowCardinality.cpp b/src/Functions/toLowCardinality.cpp
index fe06b2d6087..4e35d2e1b32 100644
--- a/src/Functions/toLowCardinality.cpp
+++ b/src/Functions/toLowCardinality.cpp
@@ -14,7 +14,7 @@ class FunctionToLowCardinality: public IFunction
 {
 public:
     static constexpr auto name = "toLowCardinality";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToLowCardinality>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToLowCardinality>(); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/toModifiedJulianDay.cpp b/src/Functions/toModifiedJulianDay.cpp
index 32e9eb23987..3450de95a32 100644
--- a/src/Functions/toModifiedJulianDay.cpp
+++ b/src/Functions/toModifiedJulianDay.cpp
@@ -172,7 +172,7 @@ namespace DB
     public:
         static constexpr auto name = Name::name;
 
-        static FunctionOverloadResolverImplPtr create(const Context &)
+        static FunctionOverloadResolverImplPtr create(ContextPtr)
         {
             return std::make_unique<ToModifiedJulianDayOverloadResolver<Name, ToDataType, nullOnErrors>>();
         }
diff --git a/src/Functions/toNullable.cpp b/src/Functions/toNullable.cpp
index 5758fe41adf..af64142798e 100644
--- a/src/Functions/toNullable.cpp
+++ b/src/Functions/toNullable.cpp
@@ -16,7 +16,7 @@ class FunctionToNullable : public IFunction
 public:
     static constexpr auto name = "toNullable";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionToNullable>();
     }
diff --git a/src/Functions/toStartOfInterval.cpp b/src/Functions/toStartOfInterval.cpp
index f194da166aa..d21565f9cf0 100644
--- a/src/Functions/toStartOfInterval.cpp
+++ b/src/Functions/toStartOfInterval.cpp
@@ -184,7 +184,7 @@ namespace
 class FunctionToStartOfInterval : public IFunction
 {
 public:
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToStartOfInterval>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToStartOfInterval>(); }
 
     static constexpr auto name = function_name;
     String getName() const override { return name; }
diff --git a/src/Functions/toTimezone.cpp b/src/Functions/toTimezone.cpp
index d12f926b284..a5df3a87f2b 100644
--- a/src/Functions/toTimezone.cpp
+++ b/src/Functions/toTimezone.cpp
@@ -25,7 +25,7 @@ class FunctionToTimezone : public IFunction
 {
 public:
     static constexpr auto name = "toTimezone";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionToTimezone>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionToTimezone>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/toTypeName.cpp b/src/Functions/toTypeName.cpp
index 5de07e1d386..92d24b1dc99 100644
--- a/src/Functions/toTypeName.cpp
+++ b/src/Functions/toTypeName.cpp
@@ -65,7 +65,7 @@ class FunctionToTypeNameBuilder : public IFunctionOverloadResolverImpl
 public:
     static constexpr auto name = "toTypeName";
     String getName() const override { return name; }
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<FunctionToTypeNameBuilder>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<FunctionToTypeNameBuilder>(); }
 
     size_t getNumberOfArguments() const override { return 1; }
 
diff --git a/src/Functions/today.cpp b/src/Functions/today.cpp
index 511af881d73..65e94c047e6 100644
--- a/src/Functions/today.cpp
+++ b/src/Functions/today.cpp
@@ -71,7 +71,7 @@ public:
 
     size_t getNumberOfArguments() const override { return 0; }
 
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<TodayOverloadResolver>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<TodayOverloadResolver>(); }
 
     DataTypePtr getReturnType(const DataTypes &) const override { return std::make_shared<DataTypeDate>(); }
 
diff --git a/src/Functions/transform.cpp b/src/Functions/transform.cpp
index 07fbd5a7b96..b7c2b584ba0 100644
--- a/src/Functions/transform.cpp
+++ b/src/Functions/transform.cpp
@@ -58,7 +58,7 @@ class FunctionTransform : public IFunction
 {
 public:
     static constexpr auto name = "transform";
-    static FunctionPtr create(const Context &) { return std::make_shared<FunctionTransform>(); }
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionTransform>(); }
 
     String getName() const override
     {
diff --git a/src/Functions/trap.cpp b/src/Functions/trap.cpp
index 61ec52a1d07..f946a7fabfb 100644
--- a/src/Functions/trap.cpp
+++ b/src/Functions/trap.cpp
@@ -32,16 +32,16 @@ namespace ErrorCodes
 class FunctionTrap : public IFunction
 {
 private:
-    const Context & context;
+    ContextPtr context;
 
 public:
     static constexpr auto name = "trap";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
         return std::make_shared<FunctionTrap>(context);
     }
 
-    FunctionTrap(const Context & context_) : context(context_) {}
+    FunctionTrap(ContextPtr context_) : context(context_) {}
 
     String getName() const override
     {
diff --git a/src/Functions/tuple.cpp b/src/Functions/tuple.cpp
index 308090eb9bb..80a6f284bea 100644
--- a/src/Functions/tuple.cpp
+++ b/src/Functions/tuple.cpp
@@ -24,7 +24,7 @@ class FunctionTuple : public IFunction
 public:
     static constexpr auto name = "tuple";
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionTuple>();
     }
diff --git a/src/Functions/tupleElement.cpp b/src/Functions/tupleElement.cpp
index dbfa802a414..ecf1ed5203f 100644
--- a/src/Functions/tupleElement.cpp
+++ b/src/Functions/tupleElement.cpp
@@ -30,7 +30,7 @@ class FunctionTupleElement : public IFunction
 {
 public:
     static constexpr auto name = "tupleElement";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionTupleElement>();
     }
diff --git a/src/Functions/tupleHammingDistance.cpp b/src/Functions/tupleHammingDistance.cpp
index 0fd21e0ea91..9d660e388cb 100644
--- a/src/Functions/tupleHammingDistance.cpp
+++ b/src/Functions/tupleHammingDistance.cpp
@@ -19,14 +19,14 @@ namespace ErrorCodes
 class FunctionTupleHammingDistance : public IFunction
 {
 private:
-    const Context & context;
+    ContextPtr context;
 
 public:
     static constexpr auto name = "tupleHammingDistance";
     using ResultType = UInt8;
 
-    explicit FunctionTupleHammingDistance(const Context & context_) : context(context_) {}
-    static FunctionPtr create(const Context & context) { return std::make_shared<FunctionTupleHammingDistance>(context); }
+    explicit FunctionTupleHammingDistance(ContextPtr context_) : context(context_) {}
+    static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionTupleHammingDistance>(context); }
 
     String getName() const override { return name; }
 
diff --git a/src/Functions/uptime.cpp b/src/Functions/uptime.cpp
index b5662a87c93..f31cb2b0d17 100644
--- a/src/Functions/uptime.cpp
+++ b/src/Functions/uptime.cpp
@@ -13,9 +13,9 @@ class FunctionUptime : public IFunction
 {
 public:
     static constexpr auto name = "uptime";
-    static FunctionPtr create(const Context & context)
+    static FunctionPtr create(ContextPtr context)
     {
-        return std::make_shared<FunctionUptime>(context.getUptimeSeconds());
+        return std::make_shared<FunctionUptime>(context->getUptimeSeconds());
     }
 
     explicit FunctionUptime(time_t uptime_) : uptime(uptime_)
diff --git a/src/Functions/version.cpp b/src/Functions/version.cpp
index 37f9c7b1e98..0af269d8f89 100644
--- a/src/Functions/version.cpp
+++ b/src/Functions/version.cpp
@@ -16,7 +16,7 @@ class FunctionVersion : public IFunction
 {
 public:
     static constexpr auto name = "version";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionVersion>();
     }
diff --git a/src/Functions/visibleWidth.cpp b/src/Functions/visibleWidth.cpp
index ed4d2b3d501..7a2a2f54f45 100644
--- a/src/Functions/visibleWidth.cpp
+++ b/src/Functions/visibleWidth.cpp
@@ -19,7 +19,7 @@ class FunctionVisibleWidth : public IFunction
 {
 public:
     static constexpr auto name = "visibleWidth";
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionVisibleWidth>();
     }
diff --git a/src/Functions/wkt.cpp b/src/Functions/wkt.cpp
index 1d509a7c508..b5567a19e89 100644
--- a/src/Functions/wkt.cpp
+++ b/src/Functions/wkt.cpp
@@ -16,7 +16,7 @@ public:
 
     explicit FunctionWkt() = default;
 
-    static FunctionPtr create(const Context &)
+    static FunctionPtr create(ContextPtr)
     {
         return std::make_shared<FunctionWkt>();
     }
diff --git a/src/Functions/yesterday.cpp b/src/Functions/yesterday.cpp
index 7c0d1ebd38b..76c4e1c1d16 100644
--- a/src/Functions/yesterday.cpp
+++ b/src/Functions/yesterday.cpp
@@ -69,7 +69,7 @@ public:
 
     size_t getNumberOfArguments() const override { return 0; }
 
-    static FunctionOverloadResolverImplPtr create(const Context &) { return std::make_unique<YesterdayOverloadResolver>(); }
+    static FunctionOverloadResolverImplPtr create(ContextPtr) { return std::make_unique<YesterdayOverloadResolver>(); }
 
     DataTypePtr getReturnType(const DataTypes &) const override { return std::make_shared<DataTypeDate>(); }
 
diff --git a/src/IO/ConnectionTimeouts.h b/src/IO/ConnectionTimeouts.h
index 5f12a4edc79..ba3be840e77 100644
--- a/src/IO/ConnectionTimeouts.h
+++ b/src/IO/ConnectionTimeouts.h
@@ -1,11 +1,12 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+
 #include <Poco/Timespan.h>
 
 namespace DB
 {
 
-class Context;
 struct Settings;
 
 struct ConnectionTimeouts
@@ -110,7 +111,7 @@ struct ConnectionTimeouts
     static ConnectionTimeouts getTCPTimeoutsWithoutFailover(const Settings & settings);
     /// Timeouts for the case when we will try many addresses in a loop.
     static ConnectionTimeouts getTCPTimeoutsWithFailover(const Settings & settings);
-    static ConnectionTimeouts getHTTPTimeouts(const Context & context);
+    static ConnectionTimeouts getHTTPTimeouts(ContextPtr context);
 };
 
 }
diff --git a/src/IO/ConnectionTimeoutsContext.h b/src/IO/ConnectionTimeoutsContext.h
index 1e688ff3798..8d6f96b82a3 100644
--- a/src/IO/ConnectionTimeoutsContext.h
+++ b/src/IO/ConnectionTimeoutsContext.h
@@ -27,10 +27,10 @@ inline ConnectionTimeouts ConnectionTimeouts::getTCPTimeoutsWithFailover(const S
         settings.receive_data_timeout_ms);
 }
 
-inline ConnectionTimeouts ConnectionTimeouts::getHTTPTimeouts(const Context & context)
+inline ConnectionTimeouts ConnectionTimeouts::getHTTPTimeouts(ContextPtr context)
 {
-    const auto & settings = context.getSettingsRef();
-    const auto & config = context.getConfigRef();
+    const auto & settings = context->getSettingsRef();
+    const auto & config = context->getConfigRef();
     Poco::Timespan http_keep_alive_timeout{config.getUInt("keep_alive_timeout", 10), 0};
     return ConnectionTimeouts(settings.http_connection_timeout, settings.http_send_timeout, settings.http_receive_timeout, settings.tcp_keep_alive_timeout, http_keep_alive_timeout);
 }
diff --git a/src/Interpreters/ActionLocksManager.cpp b/src/Interpreters/ActionLocksManager.cpp
index 76e5228bec3..0f9b4d01bdf 100644
--- a/src/Interpreters/ActionLocksManager.cpp
+++ b/src/Interpreters/ActionLocksManager.cpp
@@ -19,29 +19,27 @@ namespace ActionLocks
 }
 
 
-ActionLocksManager::ActionLocksManager(const Context & context)
-        : global_context(context.getGlobalContext())
+ActionLocksManager::ActionLocksManager(ContextPtr context_) : WithContext(context_->getGlobalContext())
 {
 }
 
 template <typename F>
-inline void forEachTable(F && f, const Context & context)
+inline void forEachTable(F && f, ContextPtr context)
 {
     for (auto & elem : DatabaseCatalog::instance().getDatabases())
         for (auto iterator = elem.second->getTablesIterator(context); iterator->isValid(); iterator->next())
             if (auto table = iterator->table())
                 f(table);
-
 }
 
-void ActionLocksManager::add(StorageActionBlockType action_type, const Context & context)
+void ActionLocksManager::add(StorageActionBlockType action_type, ContextPtr context_)
 {
-    forEachTable([&](const StoragePtr & table) { add(table, action_type); }, context);
+    forEachTable([&](const StoragePtr & table) { add(table, action_type); }, context_);
 }
 
 void ActionLocksManager::add(const StorageID & table_id, StorageActionBlockType action_type)
 {
-    if (auto table = DatabaseCatalog::instance().tryGetTable(table_id, global_context))
+    if (auto table = DatabaseCatalog::instance().tryGetTable(table_id, getContext()))
         add(table, action_type);
 }
 
@@ -66,7 +64,7 @@ void ActionLocksManager::remove(StorageActionBlockType action_type)
 
 void ActionLocksManager::remove(const StorageID & table_id, StorageActionBlockType action_type)
 {
-    if (auto table = DatabaseCatalog::instance().tryGetTable(table_id, global_context))
+    if (auto table = DatabaseCatalog::instance().tryGetTable(table_id, getContext()))
         remove(table, action_type);
 }
 
diff --git a/src/Interpreters/ActionLocksManager.h b/src/Interpreters/ActionLocksManager.h
index a39d8b5784f..f030afec891 100644
--- a/src/Interpreters/ActionLocksManager.h
+++ b/src/Interpreters/ActionLocksManager.h
@@ -1,9 +1,10 @@
 #pragma once
 
-#include <common/types.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/StorageID.h>
 #include <Storages/IStorage_fwd.h>
 #include <Common/ActionLock.h>
-#include <Interpreters/StorageID.h>
+#include <common/types.h>
 
 #include <mutex>
 #include <unordered_map>
@@ -12,17 +13,15 @@
 namespace DB
 {
 
-class Context;
-
 /// Holds ActionLocks for tables
 /// Does not store pointers to tables
-class ActionLocksManager
+class ActionLocksManager : WithContext
 {
 public:
-    ActionLocksManager(const Context & context);
+    explicit ActionLocksManager(ContextPtr context);
 
     /// Adds new locks for each table
-    void add(StorageActionBlockType action_type, const Context & context);
+    void add(StorageActionBlockType action_type, ContextPtr context);
     /// Add new lock for a table if it has not been already added
     void add(const StorageID & table_id, StorageActionBlockType action_type);
     void add(const StoragePtr & table, StorageActionBlockType action_type);
@@ -43,7 +42,6 @@ private:
 
     mutable std::mutex mutex;
     StorageLocks storage_locks;
-    const Context & global_context;
 };
 
 }
diff --git a/src/Interpreters/ActionsDAG.h b/src/Interpreters/ActionsDAG.h
index 6fd9d1f8f3a..bdfb4644f5b 100644
--- a/src/Interpreters/ActionsDAG.h
+++ b/src/Interpreters/ActionsDAG.h
@@ -3,6 +3,7 @@
 #include <Core/ColumnsWithTypeAndName.h>
 #include <Core/NamesAndTypes.h>
 #include <Core/Names.h>
+#include <Interpreters/Context_fwd.h>
 
 #if !defined(ARCADIA_BUILD)
 #    include "config_core.h"
diff --git a/src/Interpreters/ActionsVisitor.cpp b/src/Interpreters/ActionsVisitor.cpp
index 9045ed2c64f..21abf36c51c 100644
--- a/src/Interpreters/ActionsVisitor.cpp
+++ b/src/Interpreters/ActionsVisitor.cpp
@@ -127,7 +127,7 @@ static Block createBlockFromCollection(const Collection & collection, const Data
     return res;
 }
 
-static Field extractValueFromNode(const ASTPtr & node, const IDataType & type, const Context & context)
+static Field extractValueFromNode(const ASTPtr & node, const IDataType & type, ContextPtr context)
 {
     if (const auto * lit = node->as<ASTLiteral>())
     {
@@ -142,7 +142,7 @@ static Field extractValueFromNode(const ASTPtr & node, const IDataType & type, c
         throw Exception("Incorrect element of set. Must be literal or constant expression.", ErrorCodes::INCORRECT_ELEMENT_OF_SET);
 }
 
-static Block createBlockFromAST(const ASTPtr & node, const DataTypes & types, const Context & context)
+static Block createBlockFromAST(const ASTPtr & node, const DataTypes & types, ContextPtr context)
 {
     /// Will form a block with values from the set.
 
@@ -156,7 +156,7 @@ static Block createBlockFromAST(const ASTPtr & node, const DataTypes & types, co
     DataTypePtr tuple_type;
     Row tuple_values;
     const auto & list = node->as<ASTExpressionList &>();
-    bool transform_null_in = context.getSettingsRef().transform_null_in;
+    bool transform_null_in = context->getSettingsRef().transform_null_in;
     for (const auto & elem : list.children)
     {
         if (num_columns == 1)
@@ -245,7 +245,7 @@ Block createBlockForSet(
     const DataTypePtr & left_arg_type,
     const ASTPtr & right_arg,
     const DataTypes & set_element_types,
-    const Context & context)
+    ContextPtr context)
 {
     auto [right_arg_value, right_arg_type] = evaluateConstantExpression(right_arg, context);
 
@@ -259,7 +259,7 @@ Block createBlockForSet(
     };
 
     Block block;
-    bool tranform_null_in = context.getSettingsRef().transform_null_in;
+    bool tranform_null_in = context->getSettingsRef().transform_null_in;
 
     /// 1 in 1; (1, 2) in (1, 2); identity(tuple(tuple(tuple(1)))) in tuple(tuple(tuple(1))); etc.
     if (left_type_depth == right_type_depth)
@@ -288,9 +288,9 @@ Block createBlockForSet(
     const DataTypePtr & left_arg_type,
     const std::shared_ptr<ASTFunction> & right_arg,
     const DataTypes & set_element_types,
-    const Context & context)
+    ContextPtr context)
 {
-    auto get_tuple_type_from_ast = [&context](const auto & func) -> DataTypePtr
+    auto get_tuple_type_from_ast = [context](const auto & func) -> DataTypePtr
     {
         if (func && (func->name == "tuple" || func->name == "array") && !func->arguments->children.empty())
         {
@@ -337,7 +337,7 @@ Block createBlockForSet(
 
 SetPtr makeExplicitSet(
     const ASTFunction * node, const ActionsDAG & actions, bool create_ordered_set,
-    const Context & context, const SizeLimits & size_limits, PreparedSets & prepared_sets)
+    ContextPtr context, const SizeLimits & size_limits, PreparedSets & prepared_sets)
 {
     const IAST & args = *node->arguments;
 
@@ -371,7 +371,8 @@ SetPtr makeExplicitSet(
     else
         block = createBlockForSet(left_arg_type, right_arg, set_element_types, context);
 
-    SetPtr set = std::make_shared<Set>(size_limits, create_ordered_set, context.getSettingsRef().transform_null_in);
+    SetPtr set
+        = std::make_shared<Set>(size_limits, create_ordered_set, context->getSettingsRef().transform_null_in);
     set->setHeader(block.cloneEmpty());
     set->insertFromBlock(block);
     set->finishInsert();
@@ -429,11 +430,11 @@ public:
 };
 
 ActionsMatcher::Data::Data(
-    const Context & context_, SizeLimits set_size_limit_, size_t subquery_depth_,
+    ContextPtr context_, SizeLimits set_size_limit_, size_t subquery_depth_,
     const NamesAndTypesList & source_columns_, ActionsDAGPtr actions_dag,
     PreparedSets & prepared_sets_, SubqueriesForSets & subqueries_for_sets_,
     bool no_subqueries_, bool no_makeset_, bool only_consts_, bool create_source_for_in_)
-    : context(context_)
+    : WithContext(context_)
     , set_size_limit(set_size_limit_)
     , subquery_depth(subquery_depth_)
     , source_columns(source_columns_)
@@ -444,7 +445,7 @@ ActionsMatcher::Data::Data(
     , only_consts(only_consts_)
     , create_source_for_in(create_source_for_in_)
     , visit_depth(0)
-    , actions_stack(std::move(actions_dag), context)
+    , actions_stack(std::move(actions_dag), context_)
     , next_unique_suffix(actions_stack.getLastActions().getIndex().size() + 1)
 {
 }
@@ -454,8 +455,7 @@ bool ActionsMatcher::Data::hasColumn(const String & column_name) const
     return actions_stack.getLastActionsIndex().contains(column_name);
 }
 
-ScopeStack::ScopeStack(ActionsDAGPtr actions_dag, const Context & context_)
-    : context(context_)
+ScopeStack::ScopeStack(ActionsDAGPtr actions_dag, ContextPtr context_) : WithContext(context_)
 {
     auto & level = stack.emplace_back();
     level.actions_dag = std::move(actions_dag);
@@ -698,7 +698,7 @@ ASTs ActionsMatcher::doUntuple(const ASTFunction * function, ActionsMatcher::Dat
         else
             func->setAlias(data.getUniqueName("_ut_" + name));
 
-        auto function_builder = FunctionFactory::instance().get(func->name, data.context);
+        auto function_builder = FunctionFactory::instance().get(func->name, data.getContext());
         data.addFunction(function_builder, {tuple_name_type->name, literal->getColumnName()}, func->getColumnName());
 
         columns.push_back(std::move(func));
@@ -803,7 +803,7 @@ void ActionsMatcher::visit(const ASTFunction & node, const ASTPtr & ast, Data &
                 auto argument_name = node.arguments->children.at(0)->getColumnName();
 
                 data.addFunction(
-                        FunctionFactory::instance().get(node.name + "IgnoreSet", data.context),
+                        FunctionFactory::instance().get(node.name + "IgnoreSet", data.getContext()),
                         { argument_name, argument_name },
                         column_name);
             }
@@ -846,7 +846,7 @@ void ActionsMatcher::visit(const ASTFunction & node, const ASTPtr & ast, Data &
     FunctionOverloadResolverPtr function_builder;
     try
     {
-        function_builder = FunctionFactory::instance().get(node.name, data.context);
+        function_builder = FunctionFactory::instance().get(node.name, data.getContext());
     }
     catch (Exception & e)
     {
@@ -941,7 +941,7 @@ void ActionsMatcher::visit(const ASTFunction & node, const ASTPtr & ast, Data &
             else if (identifier && (functionIsJoinGet(node.name) || functionIsDictGet(node.name)) && arg == 0)
             {
                 auto table_id = IdentifierSemantic::extractDatabaseAndTable(*identifier);
-                table_id = data.context.resolveStorageID(table_id, Context::ResolveOrdinary);
+                table_id = data.getContext()->resolveStorageID(table_id, Context::ResolveOrdinary);
                 auto column_string = ColumnString::create();
                 column_string->insert(table_id.getDatabaseName() + "." + table_id.getTableName());
                 ColumnWithTypeAndName column(
@@ -1005,7 +1005,7 @@ void ActionsMatcher::visit(const ASTFunction & node, const ASTPtr & ast, Data &
 
                     auto lambda_actions = std::make_shared<ExpressionActions>(
                         lambda_dag,
-                        ExpressionActionsSettings::fromContext(data.context));
+                        ExpressionActionsSettings::fromContext(data.getContext()));
 
                     DataTypePtr result_type = lambda_actions->getSampleBlock().getByName(result_name).type;
 
@@ -1125,8 +1125,8 @@ SetPtr ActionsMatcher::makeSet(const ASTFunction & node, Data & data, bool no_su
         ///  and the table has the type Set (a previously prepared set).
         if (identifier)
         {
-            auto table_id = data.context.resolveStorageID(right_in_operand);
-            StoragePtr table = DatabaseCatalog::instance().tryGetTable(table_id, data.context);
+            auto table_id = data.getContext()->resolveStorageID(right_in_operand);
+            StoragePtr table = DatabaseCatalog::instance().tryGetTable(table_id, data.getContext());
 
             if (table)
             {
@@ -1151,7 +1151,7 @@ SetPtr ActionsMatcher::makeSet(const ASTFunction & node, Data & data, bool no_su
             return subquery_for_set.set;
         }
 
-        SetPtr set = std::make_shared<Set>(data.set_size_limit, false, data.context.getSettingsRef().transform_null_in);
+        SetPtr set = std::make_shared<Set>(data.set_size_limit, false, data.getContext()->getSettingsRef().transform_null_in);
 
         /** The following happens for GLOBAL INs or INs:
           * - in the addExternalStorage function, the IN (SELECT ...) subquery is replaced with IN _data1,
@@ -1163,7 +1163,7 @@ SetPtr ActionsMatcher::makeSet(const ASTFunction & node, Data & data, bool no_su
           */
         if (!subquery_for_set.source && data.create_source_for_in)
         {
-            auto interpreter = interpretSubquery(right_in_operand, data.context, data.subquery_depth, {});
+            auto interpreter = interpretSubquery(right_in_operand, data.getContext(), data.subquery_depth, {});
             subquery_for_set.source = std::make_unique<QueryPlan>();
             interpreter->buildQueryPlan(*subquery_for_set.source);
         }
@@ -1178,7 +1178,7 @@ SetPtr ActionsMatcher::makeSet(const ASTFunction & node, Data & data, bool no_su
         const auto & index = data.actions_stack.getLastActionsIndex();
         if (index.contains(left_in_operand->getColumnName()))
             /// An explicit enumeration of values in parentheses.
-            return makeExplicitSet(&node, last_actions, false, data.context, data.set_size_limit, data.prepared_sets);
+            return makeExplicitSet(&node, last_actions, false, data.getContext(), data.set_size_limit, data.prepared_sets);
         else
             return {};
     }
diff --git a/src/Interpreters/ActionsVisitor.h b/src/Interpreters/ActionsVisitor.h
index 42c3ea1e5bc..1d7d64f739a 100644
--- a/src/Interpreters/ActionsVisitor.h
+++ b/src/Interpreters/ActionsVisitor.h
@@ -1,15 +1,15 @@
 #pragma once
 
-#include <Parsers/IAST.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/InDepthNodeVisitor.h>
 #include <Interpreters/PreparedSets.h>
 #include <Interpreters/SubqueryForSet.h>
-#include <Interpreters/InDepthNodeVisitor.h>
+#include <Parsers/IAST.h>
 
 
 namespace DB
 {
 
-class Context;
 class ASTFunction;
 
 class ExpressionActions;
@@ -24,7 +24,7 @@ using FunctionOverloadResolverPtr = std::shared_ptr<IFunctionOverloadResolver>;
 /// The case of an explicit enumeration of values.
 SetPtr makeExplicitSet(
     const ASTFunction * node, const ActionsDAG & actions, bool create_ordered_set,
-    const Context & context, const SizeLimits & limits, PreparedSets & prepared_sets);
+    ContextPtr context, const SizeLimits & limits, PreparedSets & prepared_sets);
 
 /** Create a block for set from expression.
   * 'set_element_types' - types of what are on the left hand side of IN.
@@ -41,7 +41,7 @@ Block createBlockForSet(
     const DataTypePtr & left_arg_type,
     const std::shared_ptr<ASTFunction> & right_arg,
     const DataTypes & set_element_types,
-    const Context & context);
+    ContextPtr context);
 
 /** Create a block for set from literal.
   * 'set_element_types' - types of what are on the left hand side of IN.
@@ -51,7 +51,7 @@ Block createBlockForSet(
     const DataTypePtr & left_arg_type,
     const ASTPtr & right_arg,
     const DataTypes & set_element_types,
-    const Context & context);
+    ContextPtr context);
 
 /** For ActionsVisitor
   * A stack of ExpressionActions corresponding to nested lambda expressions.
@@ -60,7 +60,7 @@ Block createBlockForSet(
   *  calculation of the product must be done outside the lambda expression (it does not depend on x),
   *  and the calculation of the sum is inside (depends on x).
   */
-struct ScopeStack
+struct ScopeStack : WithContext
 {
     class Index;
     using IndexPtr = std::unique_ptr<Index>;
@@ -80,9 +80,7 @@ struct ScopeStack
 
     Levels stack;
 
-    const Context & context;
-
-    ScopeStack(ActionsDAGPtr actions_dag, const Context & context_);
+    ScopeStack(ActionsDAGPtr actions_dag, ContextPtr context_);
 
     void pushLevel(const NamesAndTypesList & input_columns);
 
@@ -113,9 +111,8 @@ class ActionsMatcher
 public:
     using Visitor = ConstInDepthNodeVisitor<ActionsMatcher, true>;
 
-    struct Data
+    struct Data : public WithContext
     {
-        const Context & context;
         SizeLimits set_size_limit;
         size_t subquery_depth;
         const NamesAndTypesList & source_columns;
@@ -135,10 +132,18 @@ public:
          */
         int next_unique_suffix;
 
-        Data(const Context & context_, SizeLimits set_size_limit_, size_t subquery_depth_,
-                const NamesAndTypesList & source_columns_, ActionsDAGPtr actions_dag,
-                PreparedSets & prepared_sets_, SubqueriesForSets & subqueries_for_sets_,
-                bool no_subqueries_, bool no_makeset_, bool only_consts_, bool create_source_for_in_);
+        Data(
+            ContextPtr context_,
+            SizeLimits set_size_limit_,
+            size_t subquery_depth_,
+            const NamesAndTypesList & source_columns_,
+            ActionsDAGPtr actions_dag,
+            PreparedSets & prepared_sets_,
+            SubqueriesForSets & subqueries_for_sets_,
+            bool no_subqueries_,
+            bool no_makeset_,
+            bool only_consts_,
+            bool create_source_for_in_);
 
         /// Does result of the calculation already exists in the block.
         bool hasColumn(const String & column_name) const;
diff --git a/src/Interpreters/ArrayJoinAction.cpp b/src/Interpreters/ArrayJoinAction.cpp
index 77d63bd7752..3d176857601 100644
--- a/src/Interpreters/ArrayJoinAction.cpp
+++ b/src/Interpreters/ArrayJoinAction.cpp
@@ -16,10 +16,10 @@ namespace ErrorCodes
     extern const int TYPE_MISMATCH;
 }
 
-ArrayJoinAction::ArrayJoinAction(const NameSet & array_joined_columns_, bool array_join_is_left, const Context & context)
+ArrayJoinAction::ArrayJoinAction(const NameSet & array_joined_columns_, bool array_join_is_left, ContextPtr context)
     : columns(array_joined_columns_)
     , is_left(array_join_is_left)
-    , is_unaligned(context.getSettingsRef().enable_unaligned_array_join)
+    , is_unaligned(context->getSettingsRef().enable_unaligned_array_join)
 {
     if (columns.empty())
         throw Exception("No arrays to join", ErrorCodes::LOGICAL_ERROR);
diff --git a/src/Interpreters/ArrayJoinAction.h b/src/Interpreters/ArrayJoinAction.h
index 81f720f00ef..975bf25a953 100644
--- a/src/Interpreters/ArrayJoinAction.h
+++ b/src/Interpreters/ArrayJoinAction.h
@@ -2,13 +2,12 @@
 
 #include <Core/Names.h>
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
 {
 
-class Context;
-
 class IFunctionOverloadResolver;
 using FunctionOverloadResolverPtr = std::shared_ptr<IFunctionOverloadResolver>;
 
@@ -27,7 +26,7 @@ public:
     /// For LEFT ARRAY JOIN.
     FunctionOverloadResolverPtr function_builder;
 
-    ArrayJoinAction(const NameSet & array_joined_columns_, bool array_join_is_left, const Context & context);
+    ArrayJoinAction(const NameSet & array_joined_columns_, bool array_join_is_left, ContextPtr context);
     void prepare(ColumnsWithTypeAndName & sample) const;
     void execute(Block & block);
 };
diff --git a/src/Interpreters/AsynchronousMetrics.cpp b/src/Interpreters/AsynchronousMetrics.cpp
index 3d582293190..6eb143d17df 100644
--- a/src/Interpreters/AsynchronousMetrics.cpp
+++ b/src/Interpreters/AsynchronousMetrics.cpp
@@ -172,7 +172,7 @@ void AsynchronousMetrics::update()
     AsynchronousMetricValues new_values;
 
     {
-        if (auto mark_cache = global_context.getMarkCache())
+        if (auto mark_cache = getContext()->getMarkCache())
         {
             new_values["MarkCacheBytes"] = mark_cache->weight();
             new_values["MarkCacheFiles"] = mark_cache->count();
@@ -180,7 +180,7 @@ void AsynchronousMetrics::update()
     }
 
     {
-        if (auto uncompressed_cache = global_context.getUncompressedCache())
+        if (auto uncompressed_cache = getContext()->getUncompressedCache())
         {
             new_values["UncompressedCacheBytes"] = uncompressed_cache->weight();
             new_values["UncompressedCacheCells"] = uncompressed_cache->count();
@@ -188,7 +188,7 @@ void AsynchronousMetrics::update()
     }
 
     {
-        if (auto mmap_cache = global_context.getMMappedFileCache())
+        if (auto mmap_cache = getContext()->getMMappedFileCache())
         {
             new_values["MMapCacheCells"] = mmap_cache->count();
         }
@@ -201,7 +201,7 @@ void AsynchronousMetrics::update()
     }
 #endif
 
-    new_values["Uptime"] = global_context.getUptimeSeconds();
+    new_values["Uptime"] = getContext()->getUptimeSeconds();
 
     /// Process memory usage according to OS
 #if defined(OS_LINUX)
@@ -264,7 +264,7 @@ void AsynchronousMetrics::update()
             /// Check if database can contain MergeTree tables
             if (!db.second->canContainMergeTreeTables())
                 continue;
-            for (auto iterator = db.second->getTablesIterator(global_context); iterator->isValid(); iterator->next())
+            for (auto iterator = db.second->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
             {
                 ++total_number_of_tables;
                 const auto & table = iterator->table();
@@ -307,14 +307,14 @@ void AsynchronousMetrics::update()
                 if (table_merge_tree)
                 {
                     calculateMax(max_part_count_for_partition, table_merge_tree->getMaxPartsCountForPartition());
-                    const auto & settings = global_context.getSettingsRef();
+                    const auto & settings = getContext()->getSettingsRef();
                     total_number_of_bytes += table_merge_tree->totalBytes(settings).value();
                     total_number_of_rows += table_merge_tree->totalRows(settings).value();
                     total_number_of_parts += table_merge_tree->getPartsCount();
                 }
                 if (table_replicated_merge_tree)
                 {
-                    const auto & settings = global_context.getSettingsRef();
+                    const auto & settings = getContext()->getSettingsRef();
                     total_number_of_bytes += table_replicated_merge_tree->totalBytes(settings).value();
                     total_number_of_rows += table_replicated_merge_tree->totalRows(settings).value();
                     total_number_of_parts += table_replicated_merge_tree->getPartsCount();
@@ -454,7 +454,7 @@ void AsynchronousMetrics::update()
     /// Add more metrics as you wish.
 
     // Log the new metrics.
-    if (auto log = global_context.getAsynchronousMetricLog())
+    if (auto log = getContext()->getAsynchronousMetricLog())
     {
         log->addValues(new_values);
     }
diff --git a/src/Interpreters/AsynchronousMetrics.h b/src/Interpreters/AsynchronousMetrics.h
index f727b1d6b48..38875c21edd 100644
--- a/src/Interpreters/AsynchronousMetrics.h
+++ b/src/Interpreters/AsynchronousMetrics.h
@@ -1,18 +1,19 @@
 #pragma once
 
-#include <thread>
-#include <mutex>
-#include <condition_variable>
-#include <unordered_map>
-#include <string>
-#include <Common/ThreadPool.h>
+#include <Interpreters/Context_fwd.h>
 #include <Common/MemoryStatisticsOS.h>
+#include <Common/ThreadPool.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <unordered_map>
 
 
 namespace DB
 {
 
-class Context;
 class ProtocolServerAdapter;
 
 using AsynchronousMetricValue = double;
@@ -23,16 +24,16 @@ using AsynchronousMetricValues = std::unordered_map<std::string, AsynchronousMet
   *  calculates and updates some metrics,
   *  that are not updated automatically (so, need to be asynchronously calculated).
   */
-class AsynchronousMetrics
+class AsynchronousMetrics : WithContext
 {
 public:
 #if defined(ARCADIA_BUILD)
     /// This constructor needs only to provide backward compatibility with some other projects (hello, Arcadia).
     /// Never use this in the ClickHouse codebase.
     AsynchronousMetrics(
-        Context & global_context_,
+        ContextPtr global_context_,
         int update_period_seconds = 60)
-        : global_context(global_context_)
+        : WithContext(global_context_)
         , update_period(update_period_seconds)
     {
     }
@@ -42,11 +43,11 @@ public:
     /// in Arcadia -- it uses its own server implementation that also uses these
     /// metrics.
     AsynchronousMetrics(
-        Context & global_context_,
+        ContextPtr global_context_,
         int update_period_seconds,
         std::shared_ptr<std::vector<ProtocolServerAdapter>> servers_to_start_before_tables_,
         std::shared_ptr<std::vector<ProtocolServerAdapter>> servers_)
-        : global_context(global_context_)
+        : WithContext(global_context_)
         , update_period(update_period_seconds)
         , servers_to_start_before_tables(servers_to_start_before_tables_)
         , servers(servers_)
@@ -68,7 +69,6 @@ public:
     AsynchronousMetricValues getValues() const;
 
 private:
-    Context & global_context;
     const std::chrono::seconds update_period;
     std::shared_ptr<std::vector<ProtocolServerAdapter>> servers_to_start_before_tables{nullptr};
     std::shared_ptr<std::vector<ProtocolServerAdapter>> servers{nullptr};
diff --git a/src/Interpreters/Cluster.h b/src/Interpreters/Cluster.h
index 0fb75211bd2..3837cc6726a 100644
--- a/src/Interpreters/Cluster.h
+++ b/src/Interpreters/Cluster.h
@@ -1,10 +1,12 @@
 #pragma once
 
-#include <map>
 #include <Client/ConnectionPool.h>
 #include <Client/ConnectionPoolWithFailover.h>
+
 #include <Poco/Net/SocketAddress.h>
 
+#include <map>
+
 namespace Poco
 {
     namespace Util
diff --git a/src/Interpreters/ClusterProxy/IStreamFactory.h b/src/Interpreters/ClusterProxy/IStreamFactory.h
index 3cf100cd85c..ccd06c78985 100644
--- a/src/Interpreters/ClusterProxy/IStreamFactory.h
+++ b/src/Interpreters/ClusterProxy/IStreamFactory.h
@@ -8,7 +8,6 @@ namespace DB
 {
 
 struct Settings;
-class Context;
 class Cluster;
 class Throttler;
 struct SelectQueryInfo;
@@ -27,12 +26,12 @@ namespace ClusterProxy
 class IStreamFactory
 {
 public:
-    virtual ~IStreamFactory() {}
+    virtual ~IStreamFactory() = default;
 
     virtual void createForShard(
             const Cluster::ShardInfo & shard_info,
             const String & query, const ASTPtr & query_ast,
-            const std::shared_ptr<Context> & context_ptr, const ThrottlerPtr & throttler,
+            ContextPtr context, const ThrottlerPtr & throttler,
             const SelectQueryInfo & query_info,
             std::vector<QueryPlanPtr> & res,
             Pipes & remote_pipes,
diff --git a/src/Interpreters/ClusterProxy/SelectStreamFactory.cpp b/src/Interpreters/ClusterProxy/SelectStreamFactory.cpp
index 0b1f964af32..07d554e4dc8 100644
--- a/src/Interpreters/ClusterProxy/SelectStreamFactory.cpp
+++ b/src/Interpreters/ClusterProxy/SelectStreamFactory.cpp
@@ -76,7 +76,7 @@ namespace
 std::unique_ptr<QueryPlan> createLocalPlan(
     const ASTPtr & query_ast,
     const Block & header,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum processed_stage)
 {
     checkStackSize();
@@ -116,23 +116,21 @@ String formattedAST(const ASTPtr & ast)
 void SelectStreamFactory::createForShard(
     const Cluster::ShardInfo & shard_info,
     const String &, const ASTPtr & query_ast,
-    const std::shared_ptr<Context> & context_ptr, const ThrottlerPtr & throttler,
+    ContextPtr context, const ThrottlerPtr & throttler,
     const SelectQueryInfo &,
     std::vector<QueryPlanPtr> & plans,
     Pipes & remote_pipes,
     Pipes & delayed_pipes,
     Poco::Logger * log)
 {
-    const auto & context = *context_ptr;
-
     bool add_agg_info = processed_stage == QueryProcessingStage::WithMergeableState;
     bool add_totals = false;
     bool add_extremes = false;
-    bool async_read = context_ptr->getSettingsRef().async_socket_for_remote;
+    bool async_read = context->getSettingsRef().async_socket_for_remote;
     if (processed_stage == QueryProcessingStage::Complete)
     {
         add_totals = query_ast->as<ASTSelectQuery &>().group_by_with_totals;
-        add_extremes = context.getSettingsRef().extremes;
+        add_extremes = context->getSettingsRef().extremes;
     }
 
     auto modified_query_ast = query_ast->clone();
@@ -157,10 +155,10 @@ void SelectStreamFactory::createForShard(
             remote_query_executor->setMainTable(main_table);
 
         remote_pipes.emplace_back(createRemoteSourcePipe(remote_query_executor, add_agg_info, add_totals, add_extremes, async_read));
-        remote_pipes.back().addInterpreterContext(context_ptr);
+        remote_pipes.back().addInterpreterContext(context);
     };
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
 
     if (settings.prefer_localhost_replica && shard_info.isLocal())
     {
@@ -173,7 +171,7 @@ void SelectStreamFactory::createForShard(
         }
         else
         {
-            auto resolved_id = context.resolveStorageID(main_table);
+            auto resolved_id = context->resolveStorageID(main_table);
             main_table_storage = DatabaseCatalog::instance().tryGetTable(resolved_id, context);
         }
 
@@ -250,12 +248,12 @@ void SelectStreamFactory::createForShard(
 
         auto lazily_create_stream = [
                 pool = shard_info.pool, shard_num = shard_info.shard_num, modified_query, header = header, modified_query_ast,
-                &context, context_ptr, throttler,
+                context, throttler,
                 main_table = main_table, table_func_ptr = table_func_ptr, scalars = scalars, external_tables = external_tables,
                 stage = processed_stage, local_delay, add_agg_info, add_totals, add_extremes, async_read]()
             -> Pipe
         {
-            auto current_settings = context.getSettingsRef();
+            auto current_settings = context->getSettingsRef();
             auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(
                 current_settings).getSaturated(
                     current_settings.max_execution_time);
@@ -287,8 +285,8 @@ void SelectStreamFactory::createForShard(
             {
                 auto plan = createLocalPlan(modified_query_ast, header, context, stage);
                 return QueryPipeline::getPipe(std::move(*plan->buildQueryPipeline(
-                    QueryPlanOptimizationSettings::fromContext(*context_ptr),
-                    BuildQueryPipelineSettings::fromContext(*context_ptr))));
+                    QueryPlanOptimizationSettings::fromContext(context),
+                    BuildQueryPipelineSettings::fromContext(context))));
             }
             else
             {
@@ -305,7 +303,7 @@ void SelectStreamFactory::createForShard(
         };
 
         delayed_pipes.emplace_back(createDelayedPipe(header, lazily_create_stream, add_totals, add_extremes));
-        delayed_pipes.back().addInterpreterContext(context_ptr);
+        delayed_pipes.back().addInterpreterContext(context);
     }
     else
         emplace_remote_stream();
diff --git a/src/Interpreters/ClusterProxy/SelectStreamFactory.h b/src/Interpreters/ClusterProxy/SelectStreamFactory.h
index 596e99b8a18..5f414bc7c9a 100644
--- a/src/Interpreters/ClusterProxy/SelectStreamFactory.h
+++ b/src/Interpreters/ClusterProxy/SelectStreamFactory.h
@@ -8,8 +8,6 @@
 namespace DB
 {
 
-using Scalars = std::map<String, Block>;
-
 namespace ClusterProxy
 {
 
@@ -37,7 +35,7 @@ public:
     void createForShard(
         const Cluster::ShardInfo & shard_info,
         const String & query, const ASTPtr & query_ast,
-        const std::shared_ptr<Context> & context_ptr, const ThrottlerPtr & throttler,
+        ContextPtr context, const ThrottlerPtr & throttler,
         const SelectQueryInfo & query_info,
         std::vector<QueryPlanPtr> & plans,
         Pipes & remote_pipes,
diff --git a/src/Interpreters/ClusterProxy/executeQuery.cpp b/src/Interpreters/ClusterProxy/executeQuery.cpp
index 17e593481eb..ac5044ba781 100644
--- a/src/Interpreters/ClusterProxy/executeQuery.cpp
+++ b/src/Interpreters/ClusterProxy/executeQuery.cpp
@@ -24,7 +24,7 @@ namespace ErrorCodes
 namespace ClusterProxy
 {
 
-std::shared_ptr<Context> updateSettingsForCluster(const Cluster & cluster, const Context & context, const Settings & settings, Poco::Logger * log)
+ContextPtr updateSettingsForCluster(const Cluster & cluster, ContextPtr context, const Settings & settings, Poco::Logger * log)
 {
     Settings new_settings = settings;
     new_settings.queue_max_wait_ms = Cluster::saturate(new_settings.queue_max_wait_ms, settings.max_execution_time);
@@ -83,7 +83,7 @@ std::shared_ptr<Context> updateSettingsForCluster(const Cluster & cluster, const
         }
     }
 
-    auto new_context = std::make_shared<Context>(context);
+    auto new_context = Context::createCopy(context);
     new_context->setSettings(new_settings);
     return new_context;
 }
@@ -91,13 +91,13 @@ std::shared_ptr<Context> updateSettingsForCluster(const Cluster & cluster, const
 void executeQuery(
     QueryPlan & query_plan,
     IStreamFactory & stream_factory, Poco::Logger * log,
-    const ASTPtr & query_ast, const Context & context, const SelectQueryInfo & query_info)
+    const ASTPtr & query_ast, ContextPtr context, const SelectQueryInfo & query_info)
 {
     assert(log);
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
-    if (settings.max_distributed_depth && context.getClientInfo().distributed_depth > settings.max_distributed_depth)
+    if (settings.max_distributed_depth && context->getClientInfo().distributed_depth > settings.max_distributed_depth)
         throw Exception("Maximum distributed depth exceeded", ErrorCodes::TOO_LARGE_DISTRIBUTED_DEPTH);
 
     std::vector<QueryPlanPtr> plans;
@@ -111,7 +111,7 @@ void executeQuery(
     new_context->getClientInfo().distributed_depth += 1;
 
     ThrottlerPtr user_level_throttler;
-    if (auto * process_list_element = context.getProcessListElement())
+    if (auto * process_list_element = context->getProcessListElement())
         user_level_throttler = process_list_element->getUserNetworkThrottler();
 
     /// Network bandwidth limit, if needed.
diff --git a/src/Interpreters/ClusterProxy/executeQuery.h b/src/Interpreters/ClusterProxy/executeQuery.h
index 8840b82d5b2..59e4d9e7f98 100644
--- a/src/Interpreters/ClusterProxy/executeQuery.h
+++ b/src/Interpreters/ClusterProxy/executeQuery.h
@@ -1,12 +1,12 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST.h>
 
 namespace DB
 {
 
 struct Settings;
-class Context;
 class Cluster;
 struct SelectQueryInfo;
 
@@ -27,7 +27,7 @@ class IStreamFactory;
 ///   - optimize_skip_unused_shards_nesting
 ///
 /// @return new Context with adjusted settings
-std::shared_ptr<Context> updateSettingsForCluster(const Cluster & cluster, const Context & context, const Settings & settings, Poco::Logger * log = nullptr);
+ContextPtr updateSettingsForCluster(const Cluster & cluster, ContextPtr context, const Settings & settings, Poco::Logger * log = nullptr);
 
 /// Execute a distributed query, creating a vector of BlockInputStreams, from which the result can be read.
 /// `stream_factory` object encapsulates the logic of creating streams for a different type of query
@@ -35,7 +35,7 @@ std::shared_ptr<Context> updateSettingsForCluster(const Cluster & cluster, const
 void executeQuery(
     QueryPlan & query_plan,
     IStreamFactory & stream_factory, Poco::Logger * log,
-    const ASTPtr & query_ast, const Context & context, const SelectQueryInfo & query_info);
+    const ASTPtr & query_ast, ContextPtr context, const SelectQueryInfo & query_info);
 
 }
 
diff --git a/src/Interpreters/ColumnAliasesVisitor.h b/src/Interpreters/ColumnAliasesVisitor.h
index 2cd9ad796cd..a1f8e79f64c 100644
--- a/src/Interpreters/ColumnAliasesVisitor.h
+++ b/src/Interpreters/ColumnAliasesVisitor.h
@@ -56,12 +56,12 @@ public:
         /// Do not analyze joined columns.
         /// They may have aliases and come to description as is.
         const NameSet & forbidden_columns;
-        const Context & context;
+        ContextPtr context;
 
         /// private_aliases are from lambda, so these are local names.
         NameSet private_aliases;
 
-        Data(const ColumnsDescription & columns_, const NameSet & forbidden_columns_, const Context & context_)
+        Data(const ColumnsDescription & columns_, const NameSet & forbidden_columns_, ContextPtr context_)
         : columns(columns_)
         , forbidden_columns(forbidden_columns_)
         , context(context_)
diff --git a/src/Interpreters/Context.cpp b/src/Interpreters/Context.cpp
index a914b62e99b..5ea52556d48 100644
--- a/src/Interpreters/Context.cpp
+++ b/src/Interpreters/Context.cpp
@@ -139,13 +139,13 @@ public:
     /// Find existing session or create a new.
     std::shared_ptr<NamedSession> acquireSession(
         const String & session_id,
-        Context & context,
+        ContextPtr context,
         std::chrono::steady_clock::duration timeout,
         bool throw_if_not_found)
     {
         std::unique_lock lock(mutex);
 
-        auto & user_name = context.client_info.current_user;
+        auto & user_name = context->client_info.current_user;
 
         if (user_name.empty())
             throw Exception("Empty user name.", ErrorCodes::LOGICAL_ERROR);
@@ -161,7 +161,7 @@ public:
             /// Create a new session from current context.
             it = sessions.insert(std::make_pair(key, std::make_shared<NamedSession>(key, context, timeout, *this))).first;
         }
-        else if (it->second->key.first != context.client_info.current_user)
+        else if (it->second->key.first != context->client_info.current_user)
         {
             throw Exception("Session belongs to a different user", ErrorCodes::SESSION_IS_LOCKED);
         }
@@ -172,7 +172,7 @@ public:
         if (!session.unique())
             throw Exception("Session is locked by a concurrent client.", ErrorCodes::SESSION_IS_LOCKED);
 
-        session->context.client_info = context.client_info;
+        session->context->client_info = context->client_info;
 
         return session;
     }
@@ -293,7 +293,7 @@ void NamedSession::release()
 /** Set of known objects (environment), that could be used in query.
   * Shared (global) part. Order of members (especially, order of destruction) is very important.
   */
-struct ContextShared
+struct ContextSharedPart
 {
     Poco::Logger * log = &Poco::Logger::get("Context");
 
@@ -395,7 +395,7 @@ struct ContextShared
 
     Context::ConfigReloadCallback config_reload_callback;
 
-    ContextShared()
+    ContextSharedPart()
         : macros(std::make_unique<Macros>())
     {
         /// TODO: make it singleton (?)
@@ -409,7 +409,7 @@ struct ContextShared
     }
 
 
-    ~ContextShared()
+    ~ContextSharedPart()
     {
         try
         {
@@ -484,27 +484,48 @@ SharedContextHolder::SharedContextHolder(SharedContextHolder &&) noexcept = defa
 SharedContextHolder & SharedContextHolder::operator=(SharedContextHolder &&) = default;
 SharedContextHolder::SharedContextHolder() = default;
 SharedContextHolder::~SharedContextHolder() = default;
-SharedContextHolder::SharedContextHolder(std::unique_ptr<ContextShared> shared_context)
+SharedContextHolder::SharedContextHolder(std::unique_ptr<ContextSharedPart> shared_context)
     : shared(std::move(shared_context)) {}
 
 void SharedContextHolder::reset() { shared.reset(); }
 
-
-Context Context::createGlobal(ContextShared * shared)
+ContextPtr Context::createGlobal(ContextSharedPart * shared)
 {
-    Context res;
-    res.shared = shared;
+    auto res = std::shared_ptr<Context>(new Context);
+    res->shared = shared;
     return res;
 }
 
 void Context::initGlobal()
 {
-    DatabaseCatalog::init(*this);
+    DatabaseCatalog::init(shared_from_this());
 }
 
 SharedContextHolder Context::createShared()
 {
-    return SharedContextHolder(std::make_unique<ContextShared>());
+    return SharedContextHolder(std::make_unique<ContextSharedPart>());
+}
+
+ContextPtr Context::createCopy(const ContextConstPtr & other)
+{
+    return std::shared_ptr<Context>(new Context(*other));
+}
+
+ContextPtr Context::createCopy(const ContextWeakConstPtr & other)
+{
+    auto ptr = other.lock();
+    if (!ptr) throw Exception("Can't copy an expired context", ErrorCodes::LOGICAL_ERROR);
+    return createCopy(ptr);
+}
+
+ContextPtr Context::createCopy(const ContextPtr & other)
+{
+    return createCopy(std::const_pointer_cast<const Context>(other));
+}
+
+void Context::copyFrom(const ContextPtr & other)
+{
+    *this = *other;
 }
 
 Context::~Context() = default;
@@ -532,12 +553,13 @@ void Context::enableNamedSessions()
     shared->named_sessions.emplace();
 }
 
-std::shared_ptr<NamedSession> Context::acquireNamedSession(const String & session_id, std::chrono::steady_clock::duration timeout, bool session_check)
+std::shared_ptr<NamedSession>
+Context::acquireNamedSession(const String & session_id, std::chrono::steady_clock::duration timeout, bool session_check)
 {
     if (!shared->named_sessions)
         throw Exception("Support for named sessions is not enabled", ErrorCodes::NOT_IMPLEMENTED);
 
-    return shared->named_sessions->acquireSession(session_id, *this, timeout, session_check);
+    return shared->named_sessions->acquireSession(session_id, shared_from_this(), timeout, session_check);
 }
 
 String Context::resolveDatabase(const String & database_name) const
@@ -890,21 +912,23 @@ const Block & Context::getScalar(const String & name) const
 
 Tables Context::getExternalTables() const
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     auto lock = getLock();
 
     Tables res;
     for (const auto & table : external_tables_mapping)
         res[table.first] = table.second->getTable();
 
-    if (query_context && query_context != this)
+    auto query_context_ptr = query_context.lock();
+    auto session_context_ptr = session_context.lock();
+    if (query_context_ptr && query_context_ptr.get() != this)
     {
-        Tables buf = query_context->getExternalTables();
+        Tables buf = query_context_ptr->getExternalTables();
         res.insert(buf.begin(), buf.end());
     }
-    else if (session_context && session_context != this)
+    else if (session_context_ptr && session_context_ptr.get() != this)
     {
-        Tables buf = session_context->getExternalTables();
+        Tables buf = session_context_ptr->getExternalTables();
         res.insert(buf.begin(), buf.end());
     }
     return res;
@@ -913,7 +937,7 @@ Tables Context::getExternalTables() const
 
 void Context::addExternalTable(const String & table_name, TemporaryTableHolder && temporary_table)
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     auto lock = getLock();
     if (external_tables_mapping.end() != external_tables_mapping.find(table_name))
         throw Exception("Temporary table " + backQuoteIfNeed(table_name) + " already exists.", ErrorCodes::TABLE_ALREADY_EXISTS);
@@ -923,7 +947,7 @@ void Context::addExternalTable(const String & table_name, TemporaryTableHolder &
 
 std::shared_ptr<TemporaryTableHolder> Context::removeExternalTable(const String & table_name)
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     std::shared_ptr<TemporaryTableHolder> holder;
     {
         auto lock = getLock();
@@ -939,21 +963,21 @@ std::shared_ptr<TemporaryTableHolder> Context::removeExternalTable(const String
 
 void Context::addScalar(const String & name, const Block & block)
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     scalars[name] = block;
 }
 
 
 bool Context::hasScalar(const String & name) const
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     return scalars.count(name);
 }
 
 
 void Context::addQueryAccessInfo(const String & quoted_database_name, const String & full_quoted_table_name, const Names & column_names)
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     std::lock_guard<std::mutex> lock(query_access_info.mutex);
     query_access_info.databases.emplace(quoted_database_name);
     query_access_info.tables.emplace(full_quoted_table_name);
@@ -964,7 +988,7 @@ void Context::addQueryAccessInfo(const String & quoted_database_name, const Stri
 
 void Context::addQueryFactoriesInfo(QueryLogFactories factory_type, const String & created_object) const
 {
-    assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+    assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
     auto lock = getLock();
 
     switch (factory_type)
@@ -1009,10 +1033,10 @@ StoragePtr Context::executeTableFunction(const ASTPtr & table_expression)
 
     if (!res)
     {
-        TableFunctionPtr table_function_ptr = TableFunctionFactory::instance().get(table_expression, *this);
+        TableFunctionPtr table_function_ptr = TableFunctionFactory::instance().get(table_expression, shared_from_this());
 
         /// Run it and remember the result
-        res = table_function_ptr->execute(table_expression, *this, table_function_ptr->getName());
+        res = table_function_ptr->execute(table_expression, shared_from_this(), table_function_ptr->getName());
     }
 
     return res;
@@ -1153,7 +1177,7 @@ String Context::getInitialQueryId() const
 
 void Context::setCurrentDatabaseNameInGlobalContext(const String & name)
 {
-    if (global_context != this)
+    if (!isGlobalContext())
         throw Exception("Cannot set current database for non global context, this method should be used during server initialization",
                         ErrorCodes::LOGICAL_ERROR);
     auto lock = getLock();
@@ -1262,53 +1286,37 @@ void Context::setMacros(std::unique_ptr<Macros> && macros)
     shared->macros.set(std::move(macros));
 }
 
-const Context & Context::getQueryContext() const
+ContextPtr Context::getQueryContext() const
 {
-    if (!query_context)
-        throw Exception("There is no query", ErrorCodes::THERE_IS_NO_QUERY);
-    return *query_context;
+    auto ptr = query_context.lock();
+    if (!ptr) throw Exception("There is no query or query context has expired", ErrorCodes::THERE_IS_NO_QUERY);
+    return ptr;
 }
 
-Context & Context::getQueryContext()
+bool Context::isInternalSubquery() const
 {
-    if (!query_context)
-        throw Exception("There is no query", ErrorCodes::THERE_IS_NO_QUERY);
-    return *query_context;
+    auto ptr = query_context.lock();
+    return ptr && ptr.get() != this;
 }
 
-const Context & Context::getSessionContext() const
+ContextPtr Context::getSessionContext() const
 {
-    if (!session_context)
-        throw Exception("There is no session", ErrorCodes::THERE_IS_NO_SESSION);
-    return *session_context;
+    auto ptr = session_context.lock();
+    if (!ptr) throw Exception("There is no session or session context has expired", ErrorCodes::THERE_IS_NO_SESSION);
+    return ptr;
 }
 
-Context & Context::getSessionContext()
+ContextPtr Context::getGlobalContext() const
 {
-    if (!session_context)
-        throw Exception("There is no session", ErrorCodes::THERE_IS_NO_SESSION);
-    return *session_context;
+    auto ptr = global_context.lock();
+    if (!ptr) throw Exception("There is no global context or global context has expired", ErrorCodes::LOGICAL_ERROR);
+    return ptr;
 }
 
-const Context & Context::getGlobalContext() const
+ContextPtr Context::getBufferContext() const
 {
-    if (!global_context)
-        throw Exception("Logical error: there is no global context", ErrorCodes::LOGICAL_ERROR);
-    return *global_context;
-}
-
-Context & Context::getGlobalContext()
-{
-    if (!global_context)
-        throw Exception("Logical error: there is no global context", ErrorCodes::LOGICAL_ERROR);
-    return *global_context;
-}
-
-const Context & Context::getBufferContext() const
-{
-    if (!buffer_context)
-        throw Exception("Logical error: there is no buffer context", ErrorCodes::LOGICAL_ERROR);
-    return *buffer_context;
+    if (!buffer_context) throw Exception("There is no buffer context", ErrorCodes::LOGICAL_ERROR);
+    return buffer_context;
 }
 
 
@@ -1325,39 +1333,29 @@ EmbeddedDictionaries & Context::getEmbeddedDictionaries()
 
 const ExternalDictionariesLoader & Context::getExternalDictionariesLoader() const
 {
-    std::lock_guard lock(shared->external_dictionaries_mutex);
-    if (!shared->external_dictionaries_loader)
-    {
-        if (!this->global_context)
-            throw Exception("Logical error: there is no global context", ErrorCodes::LOGICAL_ERROR);
-
-        shared->external_dictionaries_loader.emplace(*this->global_context);
-    }
-    return *shared->external_dictionaries_loader;
+    return const_cast<Context *>(this)->getExternalDictionariesLoader();
 }
 
 ExternalDictionariesLoader & Context::getExternalDictionariesLoader()
 {
-    return const_cast<ExternalDictionariesLoader &>(const_cast<const Context *>(this)->getExternalDictionariesLoader());
+    std::lock_guard lock(shared->external_dictionaries_mutex);
+    if (!shared->external_dictionaries_loader)
+        shared->external_dictionaries_loader.emplace(getGlobalContext());
+    return *shared->external_dictionaries_loader;
 }
 
 
 const ExternalModelsLoader & Context::getExternalModelsLoader() const
 {
-    std::lock_guard lock(shared->external_models_mutex);
-    if (!shared->external_models_loader)
-    {
-        if (!this->global_context)
-            throw Exception("Logical error: there is no global context", ErrorCodes::LOGICAL_ERROR);
-
-        shared->external_models_loader.emplace(*this->global_context);
-    }
-    return *shared->external_models_loader;
+    return const_cast<Context *>(this)->getExternalModelsLoader();
 }
 
 ExternalModelsLoader & Context::getExternalModelsLoader()
 {
-    return const_cast<ExternalModelsLoader &>(const_cast<const Context *>(this)->getExternalModelsLoader());
+    std::lock_guard lock(shared->external_models_mutex);
+    if (!shared->external_models_loader)
+        shared->external_models_loader.emplace(getGlobalContext());
+    return *shared->external_models_loader;
 }
 
 
@@ -1371,7 +1369,7 @@ EmbeddedDictionaries & Context::getEmbeddedDictionariesImpl(const bool throw_on_
 
         shared->embedded_dictionaries.emplace(
             std::move(geo_dictionaries_loader),
-            *this->global_context,
+            getGlobalContext(),
             throw_on_error);
     }
 
@@ -1891,7 +1889,7 @@ void Context::setCluster(const String & cluster_name, const std::shared_ptr<Clus
 void Context::initializeSystemLogs()
 {
     auto lock = getLock();
-    shared->system_logs.emplace(*global_context, getConfigRef());
+    shared->system_logs.emplace(getGlobalContext(), getConfigRef());
 }
 
 void Context::initializeTraceCollector()
@@ -1978,7 +1976,7 @@ std::shared_ptr<MetricLog> Context::getMetricLog()
 }
 
 
-std::shared_ptr<AsynchronousMetricLog> Context::getAsynchronousMetricLog()
+std::shared_ptr<AsynchronousMetricLog> Context::getAsynchronousMetricLog() const
 {
     auto lock = getLock();
 
@@ -2057,7 +2055,7 @@ DiskSelectorPtr Context::getDiskSelector(std::lock_guard<std::mutex> & /* lock *
         constexpr auto config_name = "storage_configuration.disks";
         const auto & config = getConfigRef();
 
-        shared->merge_tree_disk_selector = std::make_shared<DiskSelector>(config, config_name, *this);
+        shared->merge_tree_disk_selector = std::make_shared<DiskSelector>(config, config_name, shared_from_this());
     }
     return shared->merge_tree_disk_selector;
 }
@@ -2080,17 +2078,20 @@ void Context::updateStorageConfiguration(const Poco::Util::AbstractConfiguration
     std::lock_guard lock(shared->storage_policies_mutex);
 
     if (shared->merge_tree_disk_selector)
-        shared->merge_tree_disk_selector = shared->merge_tree_disk_selector->updateFromConfig(config, "storage_configuration.disks", *this);
+        shared->merge_tree_disk_selector
+            = shared->merge_tree_disk_selector->updateFromConfig(config, "storage_configuration.disks", shared_from_this());
 
     if (shared->merge_tree_storage_policy_selector)
     {
         try
         {
-            shared->merge_tree_storage_policy_selector = shared->merge_tree_storage_policy_selector->updateFromConfig(config, "storage_configuration.policies", shared->merge_tree_disk_selector);
+            shared->merge_tree_storage_policy_selector = shared->merge_tree_storage_policy_selector->updateFromConfig(
+                config, "storage_configuration.policies", shared->merge_tree_disk_selector);
         }
         catch (Exception & e)
         {
-            LOG_ERROR(shared->log, "An error has occurred while reloading storage policies, storage policies were not applied: {}", e.message());
+            LOG_ERROR(
+                shared->log, "An error has occurred while reloading storage policies, storage policies were not applied: {}", e.message());
         }
     }
 
@@ -2223,27 +2224,28 @@ void Context::checkPartitionCanBeDropped(const String & database, const String &
 
 BlockInputStreamPtr Context::getInputFormat(const String & name, ReadBuffer & buf, const Block & sample, UInt64 max_block_size) const
 {
-    return std::make_shared<InputStreamFromInputFormat>(FormatFactory::instance().getInput(name, buf, sample, *this, max_block_size));
+    return std::make_shared<InputStreamFromInputFormat>(
+        FormatFactory::instance().getInput(name, buf, sample, shared_from_this(), max_block_size));
 }
 
 BlockOutputStreamPtr Context::getOutputStreamParallelIfPossible(const String & name, WriteBuffer & buf, const Block & sample) const
 {
-    return FormatFactory::instance().getOutputStreamParallelIfPossible(name, buf, sample, *this);
+    return FormatFactory::instance().getOutputStreamParallelIfPossible(name, buf, sample, shared_from_this());
 }
 
 BlockOutputStreamPtr Context::getOutputStream(const String & name, WriteBuffer & buf, const Block & sample) const
 {
-    return FormatFactory::instance().getOutputStream(name, buf, sample, *this);
+    return FormatFactory::instance().getOutputStream(name, buf, sample, shared_from_this());
 }
 
 OutputFormatPtr Context::getOutputFormatParallelIfPossible(const String & name, WriteBuffer & buf, const Block & sample) const
 {
-    return FormatFactory::instance().getOutputFormatParallelIfPossible(name, buf, sample, *this);
+    return FormatFactory::instance().getOutputFormatParallelIfPossible(name, buf, sample, shared_from_this());
 }
 
 OutputFormatPtr Context::getOutputFormat(const String & name, WriteBuffer & buf, const Block & sample) const
 {
-    return FormatFactory::instance().getOutputFormat(name, buf, sample, *this);
+    return FormatFactory::instance().getOutputFormat(name, buf, sample, shared_from_this());
 }
 
 
@@ -2309,7 +2311,7 @@ void Context::setDefaultProfiles(const Poco::Util::AbstractConfiguration & confi
     applySettingsQuirks(settings, &Poco::Logger::get("SettingsQuirks"));
 
     shared->buffer_profile_name = config.getString("buffer_profile", shared->system_profile_name);
-    buffer_context = std::make_shared<Context>(*this);
+    buffer_context = Context::createCopy(shared_from_this());
     buffer_context->setProfile(shared->buffer_profile_name);
 }
 
@@ -2335,7 +2337,7 @@ void Context::setFormatSchemaPath(const String & path)
 
 Context::SampleBlockCache & Context::getSampleBlockCache() const
 {
-    return getQueryContext().sample_block_cache;
+    return getQueryContext()->sample_block_cache;
 }
 
 
@@ -2382,7 +2384,7 @@ std::shared_ptr<ActionLocksManager> Context::getActionLocksManager()
     auto lock = getLock();
 
     if (!shared->action_locks_manager)
-        shared->action_locks_manager = std::make_shared<ActionLocksManager>(*this);
+        shared->action_locks_manager = std::make_shared<ActionLocksManager>(shared_from_this());
 
     return shared->action_locks_manager;
 }
@@ -2400,7 +2402,7 @@ void Context::initializeExternalTablesIfSet()
 {
     if (external_tables_initializer_callback)
     {
-        external_tables_initializer_callback(*this);
+        external_tables_initializer_callback(shared_from_this());
         /// Reset callback
         external_tables_initializer_callback = {};
     }
@@ -2421,7 +2423,7 @@ void Context::initializeInput(const StoragePtr & input_storage)
     if (!input_initializer_callback)
         throw Exception("Input initializer is not set", ErrorCodes::LOGICAL_ERROR);
 
-    input_initializer_callback(*this, input_storage);
+    input_initializer_callback(shared_from_this(), input_storage);
     /// Reset callback
     input_initializer_callback = {};
 }
@@ -2520,12 +2522,12 @@ StorageID Context::resolveStorageIDImpl(StorageID storage_id, StorageNamespace w
     if (look_for_external_table)
     {
         /// Global context should not contain temporary tables
-        assert(global_context != this || getApplicationType() == ApplicationType::LOCAL);
+        assert(!isGlobalContext() || getApplicationType() == ApplicationType::LOCAL);
 
         auto resolved_id = StorageID::createEmpty();
-        auto try_resolve = [&](const Context & context) -> bool
+        auto try_resolve = [&](ContextConstPtr context) -> bool
         {
-            const auto & tables = context.external_tables_mapping;
+            const auto & tables = context->external_tables_mapping;
             auto it = tables.find(storage_id.getTableName());
             if (it == tables.end())
                 return false;
@@ -2534,17 +2536,19 @@ StorageID Context::resolveStorageIDImpl(StorageID storage_id, StorageNamespace w
         };
 
         /// Firstly look for temporary table in current context
-        if (try_resolve(*this))
+        if (try_resolve(shared_from_this()))
             return resolved_id;
 
         /// If not found and current context was created from some query context, look for temporary table in query context
-        bool is_local_context = query_context && query_context != this;
-        if (is_local_context && try_resolve(*query_context))
+        auto query_context_ptr = query_context.lock();
+        bool is_local_context = query_context_ptr && query_context_ptr.get() != this;
+        if (is_local_context && try_resolve(query_context_ptr))
             return resolved_id;
 
         /// If not found and current context was created from some session context, look for temporary table in session context
-        bool is_local_or_query_context = session_context && session_context != this;
-        if (is_local_or_query_context && try_resolve(*session_context))
+        auto session_context_ptr = session_context.lock();
+        bool is_local_or_query_context = session_context_ptr && session_context_ptr.get() != this;
+        if (is_local_or_query_context && try_resolve(session_context_ptr))
             return resolved_id;
     }
 
@@ -2571,7 +2575,7 @@ StorageID Context::resolveStorageIDImpl(StorageID storage_id, StorageNamespace w
 void Context::initZooKeeperMetadataTransaction(ZooKeeperMetadataTransactionPtr txn, [[maybe_unused]] bool attach_existing)
 {
     assert(!metadata_transaction);
-    assert(attach_existing || query_context == this);
+    assert(attach_existing || query_context.lock().get() == this);
     metadata_transaction = std::move(txn);
 }
 
diff --git a/src/Interpreters/Context.h b/src/Interpreters/Context.h
index 8cc3b2f22d2..eda72c1f2d2 100644
--- a/src/Interpreters/Context.h
+++ b/src/Interpreters/Context.h
@@ -1,19 +1,26 @@
 #pragma once
 
+#include <Access/RowPolicy.h>
 #include <Core/Block.h>
 #include <Core/NamesAndTypes.h>
 #include <Core/Settings.h>
-#include <common/types.h>
 #include <Core/UUID.h>
 #include <DataStreams/IBlockStream_fwd.h>
 #include <Interpreters/ClientInfo.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/DatabaseCatalog.h>
 #include <Parsers/IAST_fwd.h>
-#include <Access/RowPolicy.h>
-#include <Common/MultiVersion.h>
-#include <Common/ThreadPool.h>
-#include <Common/OpenTelemetryTraceContext.h>
 #include <Storages/IStorage_fwd.h>
+#include <Common/MultiVersion.h>
+#include <Common/OpenTelemetryTraceContext.h>
+#include <Common/RemoteHostFilter.h>
+#include <Common/ThreadPool.h>
+#include <common/types.h>
+
+#if !defined(ARCADIA_BUILD)
+#    include "config_core.h"
+#endif
+
 #include <atomic>
 #include <chrono>
 #include <condition_variable>
@@ -22,32 +29,16 @@
 #include <mutex>
 #include <optional>
 #include <thread>
-#include <Common/RemoteHostFilter.h>
-
-#if !defined(ARCADIA_BUILD)
-#    include "config_core.h"
-#endif
 
 
-namespace Poco
-{
-    namespace Net
-    {
-        class IPAddress;
-    }
-}
-
-namespace zkutil
-{
-    class ZooKeeper;
-}
+namespace Poco::Net { class IPAddress; }
+namespace zkutil { class ZooKeeper; }
 
 
 namespace DB
 {
 
-struct ContextShared;
-class Context;
+struct ContextSharedPart;
 class ContextAccess;
 struct User;
 using UserPtr = std::shared_ptr<const User>;
@@ -130,15 +121,12 @@ class CompiledExpressionCache;
 #endif
 
 /// Callback for external tables initializer
-using ExternalTablesInitializer = std::function<void(Context &)>;
+using ExternalTablesInitializer = std::function<void(ContextPtr)>;
 
 /// Callback for initialize input()
-using InputInitializer = std::function<void(Context &, const StoragePtr &)>;
+using InputInitializer = std::function<void(ContextPtr, const StoragePtr &)>;
 /// Callback for reading blocks of data from client for function input()
-using InputBlocksReader = std::function<Block(Context &)>;
-
-/// Scalar results of sub queries
-using Scalars = std::map<String, Block>;
+using InputBlocksReader = std::function<Block(ContextPtr)>;
 
 /// An empty interface for an arbitrary object that may be attached by a shared pointer
 /// to query context, when using ClickHouse as a library.
@@ -155,15 +143,16 @@ struct SharedContextHolder
 {
     ~SharedContextHolder();
     SharedContextHolder();
-    SharedContextHolder(std::unique_ptr<ContextShared> shared_context);
+    explicit SharedContextHolder(std::unique_ptr<ContextSharedPart> shared_context);
     SharedContextHolder(SharedContextHolder &&) noexcept;
 
     SharedContextHolder & operator=(SharedContextHolder &&);
 
-    ContextShared * get() const { return shared.get(); }
+    ContextSharedPart * get() const { return shared.get(); }
     void reset();
+
 private:
-    std::unique_ptr<ContextShared> shared;
+    std::unique_ptr<ContextSharedPart> shared;
 };
 
 /** A set of known objects that can be used in the query.
@@ -172,10 +161,10 @@ private:
   *
   * Everything is encapsulated for all sorts of checks and locks.
   */
-class Context
+class Context: public std::enable_shared_from_this<Context>
 {
 private:
-    ContextShared * shared;
+    ContextSharedPart * shared;
 
     ClientInfo client_info;
     ExternalTablesInitializer external_tables_initializer_callback;
@@ -254,18 +243,19 @@ private:
     /// Needs to be chandged while having const context in factories methods
     mutable QueryFactoriesInfo query_factories_info;
 
-    //TODO maybe replace with temporary tables?
+    /// TODO: maybe replace with temporary tables?
     StoragePtr view_source;                 /// Temporary StorageValues used to generate alias columns for materialized views
     Tables table_function_results;          /// Temporary tables obtained by execution of table functions. Keyed by AST tree id.
 
-    Context * query_context = nullptr;
-    Context * session_context = nullptr;    /// Session context or nullptr. Could be equal to this.
-    Context * global_context = nullptr;     /// Global context. Could be equal to this.
-    std::shared_ptr<Context> buffer_context;/// Buffer context. Could be equal to this.
+    ContextWeakPtr query_context;
+    ContextWeakPtr session_context;  /// Session context or nullptr. Could be equal to this.
+    ContextWeakPtr global_context;   /// Global context. Could be equal to this.
+
+    /// XXX: move this stuff to shared part instead.
+    ContextPtr buffer_context;  /// Buffer context. Could be equal to this.
 
 public:
-    // Top-level OpenTelemetry trace context for the query. Makes sense only for
-    // a query context.
+    // Top-level OpenTelemetry trace context for the query. Makes sense only for a query context.
     OpenTelemetryTraceContext query_trace_context;
 
 private:
@@ -283,7 +273,7 @@ private:
     IHostContextPtr host_context;  /// Arbitrary object that may used to attach some host specific information to query context,
                                    /// when using ClickHouse as a library in some project. For example, it may contain host
                                    /// logger, some query identification information, profiling guards, etc. This field is
-                                   /// to be customized in HTTP and TCP servers by overloading the customizeContext(DB::Context&)
+                                   /// to be customized in HTTP and TCP servers by overloading the customizeContext(DB::ContextPtr)
                                    /// methods.
 
     ZooKeeperMetadataTransactionPtr metadata_transaction;    /// Distributed DDL context. I'm not sure if it's a suitable place for this,
@@ -292,16 +282,20 @@ private:
                                                     /// thousands of signatures.
                                                     /// And I hope it will be replaced with more common Transaction sometime.
 
-    /// Use copy constructor or createGlobal() instead
     Context();
+    Context(const Context &);
+    Context & operator=(const Context &);
 
 public:
     /// Create initial Context with ContextShared and etc.
-    static Context createGlobal(ContextShared * shared);
+    static ContextPtr createGlobal(ContextSharedPart * shared);
+    static ContextPtr createCopy(const ContextWeakConstPtr & other);
+    static ContextPtr createCopy(const ContextConstPtr & other);
+    static ContextPtr createCopy(const ContextPtr & other);
     static SharedContextHolder createShared();
 
-    Context(const Context &);
-    Context & operator=(const Context &);
+    void copyFrom(const ContextPtr & other);
+
     ~Context();
 
     String getPath() const;
@@ -548,27 +542,29 @@ public:
 
     /// For methods below you may need to acquire the context lock by yourself.
 
-    const Context & getQueryContext() const;
-    Context & getQueryContext();
-    bool hasQueryContext() const { return query_context != nullptr; }
-    bool isInternalSubquery() const { return hasQueryContext() && query_context != this; }
+    ContextPtr getQueryContext() const;
+    bool hasQueryContext() const { return !query_context.expired(); }
+    bool isInternalSubquery() const;
 
-    const Context & getSessionContext() const;
-    Context & getSessionContext();
-    bool hasSessionContext() const { return session_context != nullptr; }
+    ContextPtr getSessionContext() const;
+    bool hasSessionContext() const { return !session_context.expired(); }
 
-    const Context & getGlobalContext() const;
-    Context & getGlobalContext();
-    bool hasGlobalContext() const { return global_context != nullptr; }
+    ContextPtr getGlobalContext() const;
+    bool hasGlobalContext() const { return !global_context.expired(); }
+    bool isGlobalContext() const
+    {
+        auto ptr = global_context.lock();
+        return ptr && ptr.get() == this;
+    }
 
-    const Context & getBufferContext() const;
+    ContextPtr getBufferContext() const;
 
-    void setQueryContext(Context & context_) { query_context = &context_; }
-    void setSessionContext(Context & context_) { session_context = &context_; }
+    void setQueryContext(ContextPtr context_) { query_context = context_; }
+    void setSessionContext(ContextPtr context_) { session_context = context_; }
 
-    void makeQueryContext() { query_context = this; }
-    void makeSessionContext() { session_context = this; }
-    void makeGlobalContext() { initGlobal(); global_context = this; }
+    void makeQueryContext() { query_context = shared_from_this(); }
+    void makeSessionContext() { session_context = shared_from_this(); }
+    void makeGlobalContext() { initGlobal(); global_context = shared_from_this(); }
 
     const Settings & getSettingsRef() const { return settings; }
 
@@ -677,7 +673,7 @@ public:
     std::shared_ptr<TraceLog> getTraceLog();
     std::shared_ptr<TextLog> getTextLog();
     std::shared_ptr<MetricLog> getMetricLog();
-    std::shared_ptr<AsynchronousMetricLog> getAsynchronousMetricLog();
+    std::shared_ptr<AsynchronousMetricLog> getAsynchronousMetricLog() const;
     std::shared_ptr<OpenTelemetrySpanLog> getOpenTelemetrySpanLog();
 
     /// Returns an object used to log operations with parts if it possible.
@@ -806,12 +802,12 @@ struct NamedSession
 {
     NamedSessionKey key;
     UInt64 close_cycle = 0;
-    Context context;
+    ContextPtr context;
     std::chrono::steady_clock::duration timeout;
     NamedSessions & parent;
 
-    NamedSession(NamedSessionKey key_, Context & context_, std::chrono::steady_clock::duration timeout_, NamedSessions & parent_)
-        : key(key_), context(context_), timeout(timeout_), parent(parent_)
+    NamedSession(NamedSessionKey key_, ContextPtr context_, std::chrono::steady_clock::duration timeout_, NamedSessions & parent_)
+        : key(key_), context(Context::createCopy(context_)), timeout(timeout_), parent(parent_)
     {
     }
 
diff --git a/src/Interpreters/Context_fwd.h b/src/Interpreters/Context_fwd.h
new file mode 100644
index 00000000000..d7232717bb2
--- /dev/null
+++ b/src/Interpreters/Context_fwd.h
@@ -0,0 +1,54 @@
+#pragma once
+
+#include <Common/Exception.h>
+
+#include <map>
+#include <memory>
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int LOGICAL_ERROR;
+}
+
+class Block;
+
+/// Scalar results of subqueries
+using Scalars = std::map<String, Block>;
+
+class Context;
+
+/// Most used types have shorter names
+/// TODO: in the first part of refactoring all the context pointers are non-const.
+using ContextPtr = std::shared_ptr<Context>;
+using ContextConstPtr = std::shared_ptr<const Context>;
+using ContextWeakPtr = std::weak_ptr<Context>;
+using ContextWeakConstPtr = std::weak_ptr<const Context>;
+
+template <class Shared = ContextPtr>
+struct WithContextImpl
+{
+    using Weak = typename Shared::weak_type;
+    using ConstShared = std::shared_ptr<const typename Shared::element_type>;
+    using ConstWeak = typename ConstShared::weak_type;
+
+    WithContextImpl() = default;
+    explicit WithContextImpl(Weak context_) : context(context_) {}
+
+    inline Shared getContext() const
+    {
+        auto ptr = context.lock();
+        if (!ptr) throw Exception("Context has expired", ErrorCodes::LOGICAL_ERROR);
+        return ptr;
+    }
+
+protected:
+    Weak context;
+};
+
+using WithContext = WithContextImpl<>;
+using WithConstContext = WithContextImpl<ContextConstPtr>;
+
+}
diff --git a/src/Interpreters/DDLTask.cpp b/src/Interpreters/DDLTask.cpp
index d446422124a..087e5504672 100644
--- a/src/Interpreters/DDLTask.cpp
+++ b/src/Interpreters/DDLTask.cpp
@@ -52,11 +52,11 @@ void DDLLogEntry::assertVersion() const
                                                             "Maximum supported version is {}", version, max_version);
 }
 
-void DDLLogEntry::setSettingsIfRequired(const Context & context)
+void DDLLogEntry::setSettingsIfRequired(ContextPtr context)
 {
-    version = context.getSettingsRef().distributed_ddl_entry_format_version;
+    version = context->getSettingsRef().distributed_ddl_entry_format_version;
     if (version == 2)
-        settings.emplace(context.getSettingsRef().changes());
+        settings.emplace(context->getSettingsRef().changes());
 }
 
 String DDLLogEntry::toString() const
@@ -135,19 +135,19 @@ void DDLLogEntry::parse(const String & data)
 }
 
 
-void DDLTaskBase::parseQueryFromEntry(const Context & context)
+void DDLTaskBase::parseQueryFromEntry(ContextPtr context)
 {
     const char * begin = entry.query.data();
     const char * end = begin + entry.query.size();
 
     ParserQuery parser_query(end);
     String description;
-    query = parseQuery(parser_query, begin, end, description, 0, context.getSettingsRef().max_parser_depth);
+    query = parseQuery(parser_query, begin, end, description, 0, context->getSettingsRef().max_parser_depth);
 }
 
-std::unique_ptr<Context> DDLTaskBase::makeQueryContext(Context & from_context, const ZooKeeperPtr & /*zookeeper*/)
+ContextPtr DDLTaskBase::makeQueryContext(ContextPtr from_context, const ZooKeeperPtr & /*zookeeper*/)
 {
-    auto query_context = std::make_unique<Context>(from_context);
+    auto query_context = Context::createCopy(from_context);
     query_context->makeQueryContext();
     query_context->setCurrentQueryId(""); // generate random query_id
     query_context->getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
@@ -157,17 +157,17 @@ std::unique_ptr<Context> DDLTaskBase::makeQueryContext(Context & from_context, c
 }
 
 
-bool DDLTask::findCurrentHostID(const Context & global_context, Poco::Logger * log)
+bool DDLTask::findCurrentHostID(ContextPtr global_context, Poco::Logger * log)
 {
     bool host_in_hostlist = false;
 
     for (const HostID & host : entry.hosts)
     {
-        auto maybe_secure_port = global_context.getTCPPortSecure();
+        auto maybe_secure_port = global_context->getTCPPortSecure();
 
         /// The port is considered local if it matches TCP or TCP secure port that the server is listening.
         bool is_local_port = (maybe_secure_port && host.isLocalAddress(*maybe_secure_port))
-                             || host.isLocalAddress(global_context.getTCPPort());
+                             || host.isLocalAddress(global_context->getTCPPort());
 
         if (!is_local_port)
             continue;
@@ -189,14 +189,14 @@ bool DDLTask::findCurrentHostID(const Context & global_context, Poco::Logger * l
     return host_in_hostlist;
 }
 
-void DDLTask::setClusterInfo(const Context & context, Poco::Logger * log)
+void DDLTask::setClusterInfo(ContextPtr context, Poco::Logger * log)
 {
     auto * query_on_cluster = dynamic_cast<ASTQueryWithOnCluster *>(query.get());
     if (!query_on_cluster)
         throw Exception("Received unknown DDL query", ErrorCodes::UNKNOWN_TYPE_OF_QUERY);
 
     cluster_name = query_on_cluster->cluster;
-    cluster = context.tryGetCluster(cluster_name);
+    cluster = context->tryGetCluster(cluster_name);
 
     if (!cluster)
         throw Exception(ErrorCodes::INCONSISTENT_CLUSTER_DEFINITION,
@@ -277,7 +277,7 @@ bool DDLTask::tryFindHostInCluster()
     return found_exact_match;
 }
 
-bool DDLTask::tryFindHostInClusterViaResolving(const Context & context)
+bool DDLTask::tryFindHostInClusterViaResolving(ContextPtr context)
 {
     const auto & shards = cluster->getShardsAddresses();
     bool found_via_resolving = false;
@@ -288,9 +288,9 @@ bool DDLTask::tryFindHostInClusterViaResolving(const Context & context)
         {
             const Cluster::Address & address = shards[shard_num][replica_num];
 
-            if (auto resolved = address.getResolvedAddress();
-                resolved && (isLocalAddress(*resolved, context.getTCPPort())
-                             || (context.getTCPPortSecure() && isLocalAddress(*resolved, *context.getTCPPortSecure()))))
+            if (auto resolved = address.getResolvedAddress(); resolved
+                && (isLocalAddress(*resolved, context->getTCPPort())
+                    || (context->getTCPPortSecure() && isLocalAddress(*resolved, *context->getTCPPortSecure()))))
             {
                 if (found_via_resolving)
                 {
@@ -344,7 +344,7 @@ String DatabaseReplicatedTask::getShardID() const
     return database->shard_name;
 }
 
-void DatabaseReplicatedTask::parseQueryFromEntry(const Context & context)
+void DatabaseReplicatedTask::parseQueryFromEntry(ContextPtr context)
 {
     DDLTaskBase::parseQueryFromEntry(context);
     if (auto * ddl_query = dynamic_cast<ASTQueryWithTableAndOutput *>(query.get()))
@@ -355,7 +355,7 @@ void DatabaseReplicatedTask::parseQueryFromEntry(const Context & context)
     }
 }
 
-std::unique_ptr<Context> DatabaseReplicatedTask::makeQueryContext(Context & from_context, const ZooKeeperPtr & zookeeper)
+ContextPtr DatabaseReplicatedTask::makeQueryContext(ContextPtr from_context, const ZooKeeperPtr & zookeeper)
 {
     auto query_context = DDLTaskBase::makeQueryContext(from_context, zookeeper);
     query_context->getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
diff --git a/src/Interpreters/DDLTask.h b/src/Interpreters/DDLTask.h
index a333bb1af45..874a29f051d 100644
--- a/src/Interpreters/DDLTask.h
+++ b/src/Interpreters/DDLTask.h
@@ -1,4 +1,5 @@
 #pragma once
+
 #include <Core/Types.h>
 #include <Interpreters/Cluster.h>
 #include <Common/ZooKeeper/Types.h>
@@ -63,7 +64,7 @@ struct DDLLogEntry
     String initiator; // optional
     std::optional<SettingsChanges> settings;
 
-    void setSettingsIfRequired(const Context & context);
+    void setSettingsIfRequired(ContextPtr context);
     String toString() const;
     void parse(const String & data);
     void assertVersion() const;
@@ -93,11 +94,11 @@ struct DDLTaskBase
     DDLTaskBase(const DDLTaskBase &) = delete;
     virtual ~DDLTaskBase() = default;
 
-    virtual void parseQueryFromEntry(const Context & context);
+    virtual void parseQueryFromEntry(ContextPtr context);
 
     virtual String getShardID() const = 0;
 
-    virtual std::unique_ptr<Context> makeQueryContext(Context & from_context, const ZooKeeperPtr & zookeeper);
+    virtual ContextPtr makeQueryContext(ContextPtr from_context, const ZooKeeperPtr & zookeeper);
 
     inline String getActiveNodePath() const { return entry_path + "/active/" + host_id_str; }
     inline String getFinishedNodePath() const { return entry_path + "/finished/" + host_id_str; }
@@ -111,15 +112,15 @@ struct DDLTask : public DDLTaskBase
 {
     DDLTask(const String & name, const String & path) : DDLTaskBase(name, path) {}
 
-    bool findCurrentHostID(const Context & global_context, Poco::Logger * log);
+    bool findCurrentHostID(ContextPtr global_context, Poco::Logger * log);
 
-    void setClusterInfo(const Context & context, Poco::Logger * log);
+    void setClusterInfo(ContextPtr context, Poco::Logger * log);
 
     String getShardID() const override;
 
 private:
     bool tryFindHostInCluster();
-    bool tryFindHostInClusterViaResolving(const Context & context);
+    bool tryFindHostInClusterViaResolving(ContextPtr context);
 
     HostID host_id;
     String cluster_name;
@@ -134,8 +135,8 @@ struct DatabaseReplicatedTask : public DDLTaskBase
     DatabaseReplicatedTask(const String & name, const String & path, DatabaseReplicated * database_);
 
     String getShardID() const override;
-    void parseQueryFromEntry(const Context & context) override;
-    std::unique_ptr<Context> makeQueryContext(Context & from_context, const ZooKeeperPtr & zookeeper) override;
+    void parseQueryFromEntry(ContextPtr context) override;
+    ContextPtr makeQueryContext(ContextPtr from_context, const ZooKeeperPtr & zookeeper) override;
 
     DatabaseReplicated * database;
 };
diff --git a/src/Interpreters/DDLWorker.cpp b/src/Interpreters/DDLWorker.cpp
index 9021f48057e..6081f06b25f 100644
--- a/src/Interpreters/DDLWorker.cpp
+++ b/src/Interpreters/DDLWorker.cpp
@@ -149,9 +149,15 @@ std::unique_ptr<ZooKeeperLock> createSimpleZooKeeperLock(
 }
 
 
-DDLWorker::DDLWorker(int pool_size_, const std::string & zk_root_dir, const Context & context_, const Poco::Util::AbstractConfiguration * config, const String & prefix,
-                     const String & logger_name, const CurrentMetrics::Metric * max_entry_metric_)
-    : context(context_)
+DDLWorker::DDLWorker(
+    int pool_size_,
+    const std::string & zk_root_dir,
+    ContextPtr context_,
+    const Poco::Util::AbstractConfiguration * config,
+    const String & prefix,
+    const String & logger_name,
+    const CurrentMetrics::Metric * max_entry_metric_)
+    : context(Context::createCopy(context_))
     , log(&Poco::Logger::get(logger_name))
     , pool_size(pool_size_)
     , max_entry_metric(max_entry_metric_)
@@ -177,16 +183,16 @@ DDLWorker::DDLWorker(int pool_size_, const std::string & zk_root_dir, const Cont
         max_tasks_in_queue = std::max<UInt64>(1, config->getUInt64(prefix + ".max_tasks_in_queue", max_tasks_in_queue));
 
         if (config->has(prefix + ".profile"))
-            context.setSetting("profile", config->getString(prefix + ".profile"));
+            context->setSetting("profile", config->getString(prefix + ".profile"));
     }
 
-    if (context.getSettingsRef().readonly)
+    if (context->getSettingsRef().readonly)
     {
         LOG_WARNING(log, "Distributed DDL worker is run with readonly settings, it will not be able to execute DDL queries Set appropriate system_profile or distributed_ddl.profile to fix this.");
     }
 
     host_fqdn = getFQDNOrHostName();
-    host_fqdn_id = Cluster::Address::toString(host_fqdn, context.getTCPPort());
+    host_fqdn_id = Cluster::Address::toString(host_fqdn, context->getTCPPort());
 }
 
 void DDLWorker::startup()
@@ -225,7 +231,7 @@ ZooKeeperPtr DDLWorker::getAndSetZooKeeper()
     std::lock_guard lock(zookeeper_mutex);
 
     if (!current_zookeeper || current_zookeeper->expired())
-        current_zookeeper = context.getZooKeeper();
+        current_zookeeper = context->getZooKeeper();
 
     return current_zookeeper;
 }
@@ -492,8 +498,8 @@ bool DDLWorker::tryExecuteQuery(const String & query, DDLTaskBase & task, const
     {
         auto query_context = task.makeQueryContext(context, zookeeper);
         if (!task.is_initial_query)
-            query_scope.emplace(*query_context);
-        executeQuery(istr, ostr, !task.is_initial_query, *query_context, {});
+            query_scope.emplace(query_context);
+        executeQuery(istr, ostr, !task.is_initial_query, query_context, {});
 
         if (auto txn = query_context->getZooKeeperMetadataTransaction())
         {
@@ -639,7 +645,7 @@ void DDLWorker::processTask(DDLTaskBase & task, const ZooKeeperPtr & zookeeper)
                 if (!query_with_table->table.empty())
                 {
                     /// It's not CREATE DATABASE
-                    auto table_id = context.tryResolveStorageID(*query_with_table, Context::ResolveOrdinary);
+                    auto table_id = context->tryResolveStorageID(*query_with_table, Context::ResolveOrdinary);
                     storage = DatabaseCatalog::instance().tryGetTable(table_id, context);
                 }
 
diff --git a/src/Interpreters/DDLWorker.h b/src/Interpreters/DDLWorker.h
index 4814f232ce2..e92644f0f99 100644
--- a/src/Interpreters/DDLWorker.h
+++ b/src/Interpreters/DDLWorker.h
@@ -42,7 +42,7 @@ class AccessRightsElements;
 class DDLWorker
 {
 public:
-    DDLWorker(int pool_size_, const std::string & zk_root_dir, const Context & context_, const Poco::Util::AbstractConfiguration * config, const String & prefix,
+    DDLWorker(int pool_size_, const std::string & zk_root_dir, ContextPtr context_, const Poco::Util::AbstractConfiguration * config, const String & prefix,
               const String & logger_name = "DDLWorker", const CurrentMetrics::Metric * max_entry_metric_ = nullptr);
     virtual ~DDLWorker();
 
@@ -110,8 +110,7 @@ protected:
     void runMainThread();
     void runCleanupThread();
 
-protected:
-    Context context;
+    ContextPtr context;
     Poco::Logger * log;
 
     std::string host_fqdn;      /// current host domain name
diff --git a/src/Interpreters/DNSCacheUpdater.cpp b/src/Interpreters/DNSCacheUpdater.cpp
index 723945165e3..27d0c3abd92 100644
--- a/src/Interpreters/DNSCacheUpdater.cpp
+++ b/src/Interpreters/DNSCacheUpdater.cpp
@@ -1,15 +1,16 @@
 #include "DNSCacheUpdater.h"
-#include <Common/DNSResolver.h>
+
 #include <Interpreters/Context.h>
+#include <Common/DNSResolver.h>
 
 
 namespace DB
 {
 
-DNSCacheUpdater::DNSCacheUpdater(Context & context_, Int32 update_period_seconds_)
-    : context(context_),
-    update_period_seconds(update_period_seconds_),
-    pool(context_.getSchedulePool())
+DNSCacheUpdater::DNSCacheUpdater(ContextPtr context_, Int32 update_period_seconds_)
+    : WithContext(context_)
+    , update_period_seconds(update_period_seconds_)
+    , pool(getContext()->getSchedulePool())
 {
     task_handle = pool.createTask("DNSCacheUpdater", [this]{ run(); });
 }
@@ -24,7 +25,7 @@ void DNSCacheUpdater::run()
         LOG_INFO(&Poco::Logger::get("DNSCacheUpdater"), "IPs of some hosts have been changed. Will reload cluster config.");
         try
         {
-            context.reloadClusterConfig();
+            getContext()->reloadClusterConfig();
         }
         catch (...)
         {
diff --git a/src/Interpreters/DNSCacheUpdater.h b/src/Interpreters/DNSCacheUpdater.h
index 2cc0f9f0f21..bbbc2ab3d21 100644
--- a/src/Interpreters/DNSCacheUpdater.h
+++ b/src/Interpreters/DNSCacheUpdater.h
@@ -1,26 +1,24 @@
 #pragma once
 
 #include <Core/BackgroundSchedulePool.h>
+#include <Interpreters/Context_fwd.h>
 #include <Common/Stopwatch.h>
 
 
 namespace DB
 {
 
-class Context;
-
 /// Add a task to BackgroundProcessingPool that resolves all hosts and updates cache with constant period.
-class DNSCacheUpdater
+class DNSCacheUpdater : WithContext
 {
 public:
-    explicit DNSCacheUpdater(Context & context, Int32 update_period_seconds_);
+    DNSCacheUpdater(ContextPtr context, Int32 update_period_seconds_);
     ~DNSCacheUpdater();
     void start();
 
 private:
     void run();
 
-    Context & context;
     Int32 update_period_seconds;
 
     BackgroundSchedulePool & pool;
diff --git a/src/Interpreters/DatabaseAndTableWithAlias.h b/src/Interpreters/DatabaseAndTableWithAlias.h
index 709c310d281..d2b1d655de7 100644
--- a/src/Interpreters/DatabaseAndTableWithAlias.h
+++ b/src/Interpreters/DatabaseAndTableWithAlias.h
@@ -16,8 +16,6 @@ namespace DB
 class ASTSelectQuery;
 class ASTIdentifier;
 struct ASTTableExpression;
-class Context;
-
 
 /// Extracts database name (and/or alias) from table expression or identifier
 struct DatabaseAndTableWithAlias
diff --git a/src/Interpreters/DatabaseCatalog.cpp b/src/Interpreters/DatabaseCatalog.cpp
index 3088dbabd11..d88b87a73d4 100644
--- a/src/Interpreters/DatabaseCatalog.cpp
+++ b/src/Interpreters/DatabaseCatalog.cpp
@@ -48,9 +48,8 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-TemporaryTableHolder::TemporaryTableHolder(const Context & context_,
-                                           const TemporaryTableHolder::Creator & creator, const ASTPtr & query)
-    : global_context(context_.getGlobalContext())
+TemporaryTableHolder::TemporaryTableHolder(ContextPtr context_, const TemporaryTableHolder::Creator & creator, const ASTPtr & query)
+    : WithContext(context_->getGlobalContext())
     , temporary_tables(DatabaseCatalog::instance().getDatabaseForTemporaryTables().get())
 {
     ASTPtr original_create;
@@ -73,13 +72,13 @@ TemporaryTableHolder::TemporaryTableHolder(const Context & context_,
     }
     auto table_id = StorageID(DatabaseCatalog::TEMPORARY_DATABASE, global_name, id);
     auto table = creator(table_id);
-    temporary_tables->createTable(global_context, global_name, table, original_create);
+    temporary_tables->createTable(getContext(), global_name, table, original_create);
     table->startup();
 }
 
 
 TemporaryTableHolder::TemporaryTableHolder(
-    const Context & context_,
+    ContextPtr context_,
     const ColumnsDescription & columns,
     const ConstraintsDescription & constraints,
     const ASTPtr & query,
@@ -103,7 +102,7 @@ TemporaryTableHolder::TemporaryTableHolder(
 }
 
 TemporaryTableHolder::TemporaryTableHolder(TemporaryTableHolder && rhs)
-        : global_context(rhs.global_context), temporary_tables(rhs.temporary_tables), id(rhs.id)
+        : WithContext(rhs.context), temporary_tables(rhs.temporary_tables), id(rhs.id)
 {
     rhs.id = UUIDHelpers::Nil;
 }
@@ -118,7 +117,7 @@ TemporaryTableHolder & TemporaryTableHolder::operator = (TemporaryTableHolder &&
 TemporaryTableHolder::~TemporaryTableHolder()
 {
     if (id != UUIDHelpers::Nil)
-        temporary_tables->dropTable(global_context, "_tmp_" + toString(id));
+        temporary_tables->dropTable(getContext(), "_tmp_" + toString(id));
 }
 
 StorageID TemporaryTableHolder::getGlobalTableID() const
@@ -128,7 +127,7 @@ StorageID TemporaryTableHolder::getGlobalTableID() const
 
 StoragePtr TemporaryTableHolder::getTable() const
 {
-    auto table = temporary_tables->tryGetTable("_tmp_" + toString(id), global_context);
+    auto table = temporary_tables->tryGetTable("_tmp_" + toString(id), getContext());
     if (!table)
         throw Exception("Temporary table " + getGlobalTableID().getNameForLogs() + " not found", ErrorCodes::LOGICAL_ERROR);
     return table;
@@ -137,13 +136,13 @@ StoragePtr TemporaryTableHolder::getTable() const
 
 void DatabaseCatalog::loadDatabases()
 {
-    drop_delay_sec = global_context.getConfigRef().getInt("database_atomic_delay_before_drop_table_sec", default_drop_delay_sec);
+    drop_delay_sec = getContext()->getConfigRef().getInt("database_atomic_delay_before_drop_table_sec", default_drop_delay_sec);
 
-    auto db_for_temporary_and_external_tables = std::make_shared<DatabaseMemory>(TEMPORARY_DATABASE, global_context);
+    auto db_for_temporary_and_external_tables = std::make_shared<DatabaseMemory>(TEMPORARY_DATABASE, getContext());
     attachDatabase(TEMPORARY_DATABASE, db_for_temporary_and_external_tables);
 
     loadMarkedAsDroppedTables();
-    auto task_holder = global_context.getSchedulePool().createTask("DatabaseCatalog", [this](){ this->dropTableDataTask(); });
+    auto task_holder = getContext()->getSchedulePool().createTask("DatabaseCatalog", [this](){ this->dropTableDataTask(); });
     drop_task = std::make_unique<BackgroundSchedulePoolTaskHolder>(std::move(task_holder));
     (*drop_task)->activate();
     std::lock_guard lock{tables_marked_dropped_mutex};
@@ -212,7 +211,7 @@ DatabaseAndTable DatabaseCatalog::tryGetByUUID(const UUID & uuid) const
 
 DatabaseAndTable DatabaseCatalog::getTableImpl(
     const StorageID & table_id,
-    const Context & context,
+    ContextPtr context_,
     std::optional<Exception> * exception) const
 {
     if (!table_id)
@@ -268,7 +267,7 @@ DatabaseAndTable DatabaseCatalog::getTableImpl(
         database = it->second;
     }
 
-    auto table = database->tryGetTable(table_id.table_name, context);
+    auto table = database->tryGetTable(table_id.table_name, context_);
     if (!table && exception)
             exception->emplace(ErrorCodes::UNKNOWN_TABLE, "Table {} doesn't exist", table_id.getNameForLogs());
     if (!table)
@@ -351,11 +350,11 @@ DatabasePtr DatabaseCatalog::detachDatabase(const String & database_name, bool d
     if (drop)
     {
         /// Delete the database.
-        db->drop(global_context);
+        db->drop(getContext());
 
         /// Old ClickHouse versions did not store database.sql files
         Poco::File database_metadata_file(
-                global_context.getPath() + "metadata/" + escapeForFileName(database_name) + ".sql");
+                getContext()->getPath() + "metadata/" + escapeForFileName(database_name) + ".sql");
         if (database_metadata_file.exists())
             database_metadata_file.remove(false);
     }
@@ -423,7 +422,7 @@ Databases DatabaseCatalog::getDatabases() const
     return databases;
 }
 
-bool DatabaseCatalog::isTableExist(const DB::StorageID & table_id, const Context & context) const
+bool DatabaseCatalog::isTableExist(const DB::StorageID & table_id, ContextPtr context_) const
 {
     if (table_id.hasUUID())
         return tryGetByUUID(table_id.uuid).second != nullptr;
@@ -435,12 +434,12 @@ bool DatabaseCatalog::isTableExist(const DB::StorageID & table_id, const Context
         if (iter != databases.end())
             db = iter->second;
     }
-    return db && db->isTableExist(table_id.table_name, context);
+    return db && db->isTableExist(table_id.table_name, context_);
 }
 
-void DatabaseCatalog::assertTableDoesntExist(const StorageID & table_id, const Context & context) const
+void DatabaseCatalog::assertTableDoesntExist(const StorageID & table_id, ContextPtr context_) const
 {
-    if (isTableExist(table_id, context))
+    if (isTableExist(table_id, context_))
         throw Exception("Table " + table_id.getNameForLogs() + " already exists.", ErrorCodes::TABLE_ALREADY_EXISTS);
 }
 
@@ -528,13 +527,13 @@ void DatabaseCatalog::updateUUIDMapping(const UUID & uuid, DatabasePtr database,
 
 std::unique_ptr<DatabaseCatalog> DatabaseCatalog::database_catalog;
 
-DatabaseCatalog::DatabaseCatalog(Context & global_context_)
-    : global_context(global_context_), log(&Poco::Logger::get("DatabaseCatalog"))
+DatabaseCatalog::DatabaseCatalog(ContextPtr global_context_)
+    : WithContext(global_context_), log(&Poco::Logger::get("DatabaseCatalog"))
 {
-    TemporaryLiveViewCleaner::init(global_context);
+    TemporaryLiveViewCleaner::init(global_context_);
 }
 
-DatabaseCatalog & DatabaseCatalog::init(Context & global_context_)
+DatabaseCatalog & DatabaseCatalog::init(ContextPtr global_context_)
 {
     if (database_catalog)
     {
@@ -568,9 +567,9 @@ void DatabaseCatalog::shutdown()
     }
 }
 
-DatabasePtr DatabaseCatalog::getDatabase(const String & database_name, const Context & local_context) const
+DatabasePtr DatabaseCatalog::getDatabase(const String & database_name, ContextPtr local_context) const
 {
-    String resolved_database = local_context.resolveDatabase(database_name);
+    String resolved_database = local_context->resolveDatabase(database_name);
     return getDatabase(resolved_database);
 }
 
@@ -635,32 +634,32 @@ bool DatabaseCatalog::isDictionaryExist(const StorageID & table_id) const
     return db && db->isDictionaryExist(table_id.getTableName());
 }
 
-StoragePtr DatabaseCatalog::getTable(const StorageID & table_id, const Context & context) const
+StoragePtr DatabaseCatalog::getTable(const StorageID & table_id, ContextPtr local_context) const
 {
     std::optional<Exception> exc;
-    auto res = getTableImpl(table_id, context, &exc);
+    auto res = getTableImpl(table_id, local_context, &exc);
     if (!res.second)
         throw Exception(*exc);
     return res.second;
 }
 
-StoragePtr DatabaseCatalog::tryGetTable(const StorageID & table_id, const Context & context) const
+StoragePtr DatabaseCatalog::tryGetTable(const StorageID & table_id, ContextPtr local_context) const
 {
-    return getTableImpl(table_id, context, nullptr).second;
+    return getTableImpl(table_id, local_context, nullptr).second;
 }
 
-DatabaseAndTable DatabaseCatalog::getDatabaseAndTable(const StorageID & table_id, const Context & context) const
+DatabaseAndTable DatabaseCatalog::getDatabaseAndTable(const StorageID & table_id, ContextPtr local_context) const
 {
     std::optional<Exception> exc;
-    auto res = getTableImpl(table_id, context, &exc);
+    auto res = getTableImpl(table_id, local_context, &exc);
     if (!res.second)
         throw Exception(*exc);
     return res;
 }
 
-DatabaseAndTable DatabaseCatalog::tryGetDatabaseAndTable(const StorageID & table_id, const Context & context) const
+DatabaseAndTable DatabaseCatalog::tryGetDatabaseAndTable(const StorageID & table_id, ContextPtr local_context) const
 {
-    return getTableImpl(table_id, context, nullptr);
+    return getTableImpl(table_id, local_context, nullptr);
 }
 
 void DatabaseCatalog::loadMarkedAsDroppedTables()
@@ -673,7 +672,7 @@ void DatabaseCatalog::loadMarkedAsDroppedTables()
     /// we should load them and enqueue cleanup to remove data from store/ and metadata from ZooKeeper
 
     std::map<String, StorageID> dropped_metadata;
-    String path = global_context.getPath() + "metadata_dropped/";
+    String path = getContext()->getPath() + "metadata_dropped/";
 
     if (!std::filesystem::exists(path))
     {
@@ -728,7 +727,7 @@ void DatabaseCatalog::loadMarkedAsDroppedTables()
 
 String DatabaseCatalog::getPathForDroppedMetadata(const StorageID & table_id) const
 {
-    return global_context.getPath() + "metadata_dropped/" +
+    return getContext()->getPath() + "metadata_dropped/" +
            escapeForFileName(table_id.getDatabaseName()) + "." +
            escapeForFileName(table_id.getTableName()) + "." +
            toString(table_id.uuid) + ".sql";
@@ -751,7 +750,8 @@ void DatabaseCatalog::enqueueDroppedTableCleanup(StorageID table_id, StoragePtr
     {
         /// Try load table from metadata to drop it correctly (e.g. remove metadata from zk or remove data from all volumes)
         LOG_INFO(log, "Trying load partially dropped table {} from {}", table_id.getNameForLogs(), dropped_metadata_path);
-        ASTPtr ast = DatabaseOnDisk::parseQueryFromMetadata(log, global_context, dropped_metadata_path, /*throw_on_error*/ false, /*remove_empty*/false);
+        ASTPtr ast = DatabaseOnDisk::parseQueryFromMetadata(
+            log, getContext(), dropped_metadata_path, /*throw_on_error*/ false, /*remove_empty*/ false);
         auto * create = typeid_cast<ASTCreateQuery *>(ast.get());
         assert(!create || create->uuid == table_id.uuid);
 
@@ -762,7 +762,7 @@ void DatabaseCatalog::enqueueDroppedTableCleanup(StorageID table_id, StoragePtr
             create->table = table_id.table_name;
             try
             {
-                table = createTableFromAST(*create, table_id.getDatabaseName(), data_path, global_context, false).second;
+                table = createTableFromAST(*create, table_id.getDatabaseName(), data_path, getContext(), false).second;
                 table->is_dropped = true;
             }
             catch (...)
@@ -889,7 +889,7 @@ void DatabaseCatalog::dropTableFinally(const TableMarkedAsDropped & table)
 
     /// Even if table is not loaded, try remove its data from disk.
     /// TODO remove data from all volumes
-    String data_path = global_context.getPath() + "store/" + getPathForUUID(table.table_id.uuid);
+    String data_path = getContext()->getPath() + "store/" + getPathForUUID(table.table_id.uuid);
     Poco::File table_data_dir{data_path};
     if (table_data_dir.exists())
     {
diff --git a/src/Interpreters/DatabaseCatalog.h b/src/Interpreters/DatabaseCatalog.h
index dad9846da0b..388079b54f2 100644
--- a/src/Interpreters/DatabaseCatalog.h
+++ b/src/Interpreters/DatabaseCatalog.h
@@ -1,25 +1,28 @@
 #pragma once
-#include <Storages/IStorage_fwd.h>
+
+#include <Core/UUID.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/StorageID.h>
 #include <Parsers/IAST_fwd.h>
-#include <Core/UUID.h>
-#include <Poco/Logger.h>
+#include <Storages/IStorage_fwd.h>
+
 #include <boost/noncopyable.hpp>
-#include <memory>
-#include <map>
-#include <set>
-#include <unordered_map>
-#include <unordered_set>
-#include <mutex>
-#include <shared_mutex>
+#include <Poco/Logger.h>
+
 #include <array>
 #include <list>
+#include <map>
+#include <memory>
+#include <mutex>
+#include <set>
+#include <shared_mutex>
+#include <unordered_map>
+#include <unordered_set>
 
 
 namespace DB
 {
 
-class Context;
 class IDatabase;
 class Exception;
 class ColumnsDescription;
@@ -51,7 +54,12 @@ public:
     /// NOTE: using std::map here (and not std::unordered_map) to avoid iterator invalidation on insertion.
     using Map = std::map<String, Entry>;
 
-    DDLGuard(Map & map_, std::shared_mutex & db_mutex_, std::unique_lock<std::mutex> guards_lock_, const String & elem, const String & database_name);
+    DDLGuard(
+        Map & map_,
+        std::shared_mutex & db_mutex_,
+        std::unique_lock<std::mutex> guards_lock_,
+        const String & elem,
+        const String & database_name);
     ~DDLGuard();
 
     /// Unlocks table name, keeps holding read lock for database name
@@ -74,15 +82,15 @@ using DDLGuardPtr = std::unique_ptr<DDLGuard>;
 /// Such table can be accessed from everywhere by its ID.
 /// Removes the table from database on destruction.
 /// TemporaryTableHolder object can be attached to a query or session Context, so table will be accessible through the context.
-struct TemporaryTableHolder : boost::noncopyable
+struct TemporaryTableHolder : boost::noncopyable, WithContext
 {
-    typedef std::function<StoragePtr(const StorageID &)> Creator;
+    using Creator = std::function<StoragePtr (const StorageID &)>;
 
-    TemporaryTableHolder(const Context & context, const Creator & creator, const ASTPtr & query = {});
+    TemporaryTableHolder(ContextPtr context, const Creator & creator, const ASTPtr & query = {});
 
     /// Creates temporary table with Engine=Memory
     TemporaryTableHolder(
-        const Context & context,
+        ContextPtr context,
         const ColumnsDescription & columns,
         const ConstraintsDescription & constraints,
         const ASTPtr & query = {},
@@ -99,7 +107,6 @@ struct TemporaryTableHolder : boost::noncopyable
 
     operator bool () const { return id != UUIDHelpers::Nil; }
 
-    const Context & global_context;
     IDatabase * temporary_tables = nullptr;
     UUID id = UUIDHelpers::Nil;
 };
@@ -109,13 +116,14 @@ using TemporaryTablesMapping = std::map<String, std::shared_ptr<TemporaryTableHo
 
 class BackgroundSchedulePoolTaskHolder;
 
-class DatabaseCatalog : boost::noncopyable
+/// For some reason Context is required to get Storage from Database object
+class DatabaseCatalog : boost::noncopyable, WithContext
 {
 public:
     static constexpr const char * TEMPORARY_DATABASE = "_temporary_and_external_tables";
     static constexpr const char * SYSTEM_DATABASE = "system";
 
-    static DatabaseCatalog & init(Context & global_context_);
+    static DatabaseCatalog & init(ContextPtr global_context_);
     static DatabaseCatalog & instance();
     static void shutdown();
 
@@ -146,19 +154,19 @@ public:
     Databases getDatabases() const;
 
     /// Same as getDatabase(const String & database_name), but if database_name is empty, current database of local_context is used
-    DatabasePtr getDatabase(const String & database_name, const Context & local_context) const;
+    DatabasePtr getDatabase(const String & database_name, ContextPtr local_context) const;
 
     /// For all of the following methods database_name in table_id must be not empty (even for temporary tables).
-    void assertTableDoesntExist(const StorageID & table_id, const Context & context) const;
-    bool isTableExist(const StorageID & table_id, const Context & context) const;
+    void assertTableDoesntExist(const StorageID & table_id, ContextPtr context) const;
+    bool isTableExist(const StorageID & table_id, ContextPtr context) const;
     bool isDictionaryExist(const StorageID & table_id) const;
 
-    StoragePtr getTable(const StorageID & table_id, const Context & context) const;
-    StoragePtr tryGetTable(const StorageID & table_id, const Context & context) const;
-    DatabaseAndTable getDatabaseAndTable(const StorageID & table_id, const Context & context) const;
-    DatabaseAndTable tryGetDatabaseAndTable(const StorageID & table_id, const Context & context) const;
+    StoragePtr getTable(const StorageID & table_id, ContextPtr context) const;
+    StoragePtr tryGetTable(const StorageID & table_id, ContextPtr context) const;
+    DatabaseAndTable getDatabaseAndTable(const StorageID & table_id, ContextPtr context) const;
+    DatabaseAndTable tryGetDatabaseAndTable(const StorageID & table_id, ContextPtr context) const;
     DatabaseAndTable getTableImpl(const StorageID & table_id,
-                                  const Context & context,
+                                  ContextPtr context,
                                   std::optional<Exception> * exception = nullptr) const;
 
     void addDependency(const StorageID & from, const StorageID & where);
@@ -200,7 +208,7 @@ private:
     // make emplace(global_context_) compile with private constructor ¯\_(ツ)_/¯.
     static std::unique_ptr<DatabaseCatalog> database_catalog;
 
-    DatabaseCatalog(Context & global_context_);
+    explicit DatabaseCatalog(ContextPtr global_context_);
     void assertDatabaseExistsUnlocked(const String & database_name) const;
     void assertDatabaseDoesntExistUnlocked(const String & database_name) const;
 
@@ -216,7 +224,7 @@ private:
     static constexpr UInt64 bits_for_first_level = 4;
     using UUIDToStorageMap = std::array<UUIDToStorageMapPart, 1ull << bits_for_first_level>;
 
-    inline size_t getFirstLevelIdx(const UUID & uuid) const
+    static inline size_t getFirstLevelIdx(const UUID & uuid)
     {
         return uuid.toUnderType().low >> (64 - bits_for_first_level);
     }
@@ -237,11 +245,8 @@ private:
     static constexpr size_t reschedule_time_ms = 100;
     static constexpr time_t drop_error_cooldown_sec = 5;
 
-private:
     using UUIDToDatabaseMap = std::unordered_map<UUID, DatabasePtr>;
 
-    /// For some reason Context is required to get Storage from Database object
-    Context & global_context;
     mutable std::mutex databases_mutex;
 
     ViewDependencies view_dependencies;
diff --git a/src/Interpreters/DictionaryReader.cpp b/src/Interpreters/DictionaryReader.cpp
index 1b503bd8313..fc795b9cdfb 100644
--- a/src/Interpreters/DictionaryReader.cpp
+++ b/src/Interpreters/DictionaryReader.cpp
@@ -44,7 +44,7 @@ DictionaryReader::FunctionWrapper::FunctionWrapper(FunctionOverloadResolverPtr r
 static constexpr const size_t key_size = 1;
 
 DictionaryReader::DictionaryReader(const String & dictionary_name, const Names & src_column_names, const NamesAndTypesList & result_columns,
-                                   const Context & context)
+                                   ContextPtr context)
     : result_header(makeResultBlock(result_columns))
     , key_position(key_size + result_header.columns())
 {
diff --git a/src/Interpreters/DictionaryReader.h b/src/Interpreters/DictionaryReader.h
index b49a15debb3..bfb21e2f050 100644
--- a/src/Interpreters/DictionaryReader.h
+++ b/src/Interpreters/DictionaryReader.h
@@ -3,12 +3,11 @@
 #include <Core/Block.h>
 #include <Columns/ColumnVector.h>
 #include <Functions/IFunctionAdaptors.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
 
-class Context;
-
 /// Read block of required columns from Dictionary by UInt64 key column. Rename columns if needed.
 /// Current implementation uses dictHas() + N * dictGet() functions.
 class DictionaryReader
@@ -35,7 +34,7 @@ public:
     };
 
     DictionaryReader(const String & dictionary_name, const Names & src_column_names, const NamesAndTypesList & result_columns,
-                     const Context & context);
+                     ContextPtr context);
     void readKeys(const IColumn & keys, Block & out_block, ColumnVector<UInt8>::Container & found, std::vector<size_t> & positions) const;
 
 private:
diff --git a/src/Interpreters/DuplicateOrderByVisitor.h b/src/Interpreters/DuplicateOrderByVisitor.h
index f5e5763c719..4f95854e17b 100644
--- a/src/Interpreters/DuplicateOrderByVisitor.h
+++ b/src/Interpreters/DuplicateOrderByVisitor.h
@@ -21,7 +21,7 @@ class ASTFunctionStatefulData
 public:
     using TypeToVisit = ASTFunction;
 
-    const Context & context;
+    ContextPtr context;
     bool & is_stateful;
     void visit(ASTFunction & ast_function, ASTPtr &)
     {
@@ -80,7 +80,7 @@ class DuplicateOrderByData
 public:
     using TypeToVisit = ASTSelectQuery;
 
-    const Context & context;
+    ContextPtr context;
 
     void visit(ASTSelectQuery & select_query, ASTPtr &)
     {
diff --git a/src/Interpreters/EmbeddedDictionaries.cpp b/src/Interpreters/EmbeddedDictionaries.cpp
index 58b21fdda52..947768ad3d7 100644
--- a/src/Interpreters/EmbeddedDictionaries.cpp
+++ b/src/Interpreters/EmbeddedDictionaries.cpp
@@ -35,7 +35,7 @@ bool EmbeddedDictionaries::reloadDictionary(
     const bool throw_on_error,
     const bool force_reload)
 {
-    const auto & config = context.getConfigRef();
+    const auto & config = getContext()->getConfigRef();
 
     bool not_initialized = dictionary.get() == nullptr;
 
@@ -122,12 +122,12 @@ void EmbeddedDictionaries::reloadPeriodically()
 
 EmbeddedDictionaries::EmbeddedDictionaries(
     std::unique_ptr<GeoDictionariesLoader> geo_dictionaries_loader_,
-    Context & context_,
+    ContextPtr context_,
     const bool throw_on_error)
-    : log(&Poco::Logger::get("EmbeddedDictionaries"))
-    , context(context_)
+    : WithContext(context_)
+    , log(&Poco::Logger::get("EmbeddedDictionaries"))
     , geo_dictionaries_loader(std::move(geo_dictionaries_loader_))
-    , reload_period(context_.getConfigRef().getInt("builtin_dictionaries_reload_interval", 3600))
+    , reload_period(getContext()->getConfigRef().getInt("builtin_dictionaries_reload_interval", 3600))
 {
     reloadImpl(throw_on_error);
     reloading_thread = ThreadFromGlobalPool([this] { reloadPeriodically(); });
diff --git a/src/Interpreters/EmbeddedDictionaries.h b/src/Interpreters/EmbeddedDictionaries.h
index 69b21d4b39a..674b3a7f01e 100644
--- a/src/Interpreters/EmbeddedDictionaries.h
+++ b/src/Interpreters/EmbeddedDictionaries.h
@@ -1,10 +1,13 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+#include <Common/MultiVersion.h>
+#include <Common/ThreadPool.h>
+
+#include <Poco/Event.h>
+
 #include <thread>
 #include <functional>
-#include <Common/MultiVersion.h>
-#include <Common/ThreadPool.h>
-#include <Poco/Event.h>
 
 
 namespace Poco { class Logger; namespace Util { class AbstractConfiguration; } }
@@ -17,16 +20,12 @@ class GeoDictionariesLoader;
 namespace DB
 {
 
-class Context;
-
-
 /// Metrica's Dictionaries which can be used in functions.
 
-class EmbeddedDictionaries
+class EmbeddedDictionaries : WithContext
 {
 private:
     Poco::Logger * log;
-    Context & context;
 
     MultiVersion<RegionsHierarchies> regions_hierarchies;
     MultiVersion<RegionsNames> regions_names;
@@ -44,7 +43,7 @@ private:
     Poco::Event destroy;
 
 
-    void handleException(const bool throw_on_error) const;
+    void handleException(bool throw_on_error) const;
 
     /** Updates directories (dictionaries) every reload_period seconds.
      * If all dictionaries are not loaded at least once, try reload them with exponential delay (1, 2, ... reload_period).
@@ -53,7 +52,7 @@ private:
     void reloadPeriodically();
 
     /// Updates dictionaries.
-    bool reloadImpl(const bool throw_on_error, const bool force_reload = false);
+    bool reloadImpl(bool throw_on_error, bool force_reload = false);
 
     template <typename Dictionary>
     using DictionaryReloader = std::function<std::unique_ptr<Dictionary>(const Poco::Util::AbstractConfiguration & config)>;
@@ -62,15 +61,15 @@ private:
     bool reloadDictionary(
         MultiVersion<Dictionary> & dictionary,
         DictionaryReloader<Dictionary> reload_dictionary,
-        const bool throw_on_error,
-        const bool force_reload);
+        bool throw_on_error,
+        bool force_reload);
 
 public:
     /// Every reload_period seconds directories are updated inside a separate thread.
     EmbeddedDictionaries(
         std::unique_ptr<GeoDictionariesLoader> geo_dictionaries_loader,
-        Context & context,
-        const bool throw_on_error);
+        ContextPtr context,
+        bool throw_on_error);
 
     /// Forcibly reloads all dictionaries.
     void reload();
diff --git a/src/Interpreters/ExecuteScalarSubqueriesVisitor.cpp b/src/Interpreters/ExecuteScalarSubqueriesVisitor.cpp
index 94b3a5218b4..97ad191289c 100644
--- a/src/Interpreters/ExecuteScalarSubqueriesVisitor.cpp
+++ b/src/Interpreters/ExecuteScalarSubqueriesVisitor.cpp
@@ -1,26 +1,22 @@
-#include <Parsers/ASTFunction.h>
-#include <Parsers/ASTLiteral.h>
-#include <Parsers/ASTSubquery.h>
-#include <Parsers/ASTSelectQuery.h>
-#include <Parsers/ASTTablesInSelectQuery.h>
-#include <Parsers/ASTExpressionList.h>
-#include <Parsers/ASTWithElement.h>
-
-#include <Interpreters/Context.h>
-#include <Interpreters/misc.h>
-#include <Interpreters/InterpreterSelectWithUnionQuery.h>
 #include <Interpreters/ExecuteScalarSubqueriesVisitor.h>
-#include <Interpreters/addTypeConversionToAST.h>
 
+#include <Columns/ColumnTuple.h>
 #include <DataStreams/IBlockInputStream.h>
 #include <DataStreams/materializeBlock.h>
 #include <DataTypes/DataTypeAggregateFunction.h>
 #include <DataTypes/DataTypeTuple.h>
-
-#include <Columns/ColumnTuple.h>
-
 #include <IO/WriteHelpers.h>
-
+#include <Interpreters/Context.h>
+#include <Interpreters/InterpreterSelectWithUnionQuery.h>
+#include <Interpreters/addTypeConversionToAST.h>
+#include <Interpreters/misc.h>
+#include <Parsers/ASTExpressionList.h>
+#include <Parsers/ASTFunction.h>
+#include <Parsers/ASTLiteral.h>
+#include <Parsers/ASTSelectQuery.h>
+#include <Parsers/ASTSubquery.h>
+#include <Parsers/ASTTablesInSelectQuery.h>
+#include <Parsers/ASTWithElement.h>
 #include <Processors/Executors/PullingAsyncPipelineExecutor.h>
 
 namespace DB
@@ -82,17 +78,17 @@ void ExecuteScalarSubqueriesMatcher::visit(const ASTSubquery & subquery, ASTPtr
     auto scalar_query_hash_str = toString(hash.first) + "_" + toString(hash.second);
 
     Block scalar;
-    if (data.context.hasQueryContext() && data.context.getQueryContext().hasScalar(scalar_query_hash_str))
-        scalar = data.context.getQueryContext().getScalar(scalar_query_hash_str);
+    if (data.getContext()->hasQueryContext() && data.getContext()->getQueryContext()->hasScalar(scalar_query_hash_str))
+        scalar = data.getContext()->getQueryContext()->getScalar(scalar_query_hash_str);
     else if (data.scalars.count(scalar_query_hash_str))
         scalar = data.scalars[scalar_query_hash_str];
     else
     {
-        Context subquery_context = data.context;
-        Settings subquery_settings = data.context.getSettings();
+        auto subquery_context = Context::createCopy(data.getContext());
+        Settings subquery_settings = data.getContext()->getSettings();
         subquery_settings.max_result_rows = 1;
         subquery_settings.extremes = false;
-        subquery_context.setSettings(subquery_settings);
+        subquery_context->setSettings(subquery_settings);
 
         ASTPtr subquery_select = subquery.children.at(0);
 
@@ -167,10 +163,11 @@ void ExecuteScalarSubqueriesMatcher::visit(const ASTSubquery & subquery, ASTPtr
         }
     }
 
-    const Settings & settings = data.context.getSettingsRef();
+    const Settings & settings = data.getContext()->getSettingsRef();
 
     // Always convert to literals when there is no query context.
-    if (data.only_analyze || !settings.enable_scalar_subquery_optimization || worthConvertingToLiteral(scalar) || !data.context.hasQueryContext())
+    if (data.only_analyze || !settings.enable_scalar_subquery_optimization || worthConvertingToLiteral(scalar)
+        || !data.getContext()->hasQueryContext())
     {
         auto lit = std::make_unique<ASTLiteral>((*scalar.safeGetByPosition(0).column)[0]);
         lit->alias = subquery.alias;
diff --git a/src/Interpreters/ExecuteScalarSubqueriesVisitor.h b/src/Interpreters/ExecuteScalarSubqueriesVisitor.h
index 02949ad6d59..c230f346779 100644
--- a/src/Interpreters/ExecuteScalarSubqueriesVisitor.h
+++ b/src/Interpreters/ExecuteScalarSubqueriesVisitor.h
@@ -1,13 +1,13 @@
 #pragma once
 
-#include <Common/typeid_cast.h>
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/InDepthNodeVisitor.h>
+#include <Common/typeid_cast.h>
 
 namespace DB
 {
 
-class Context;
 class ASTSubquery;
 class ASTFunction;
 struct ASTTableExpression;
@@ -33,9 +33,8 @@ class ExecuteScalarSubqueriesMatcher
 public:
     using Visitor = InDepthNodeVisitor<ExecuteScalarSubqueriesMatcher, true>;
 
-    struct Data
+    struct Data : public WithContext
     {
-        const Context & context;
         size_t subquery_depth;
         Scalars & scalars;
         bool only_analyze;
diff --git a/src/Interpreters/ExpressionActions.h b/src/Interpreters/ExpressionActions.h
index 5d48ed84b7c..40a4cdcbc02 100644
--- a/src/Interpreters/ExpressionActions.h
+++ b/src/Interpreters/ExpressionActions.h
@@ -133,9 +133,9 @@ private:
   *     2) calculate the expression in the SELECT section,
   * and between the two steps do the filtering by value in the WHERE clause.
   */
-struct ExpressionActionsChain
+struct ExpressionActionsChain : WithContext
 {
-    explicit ExpressionActionsChain(const Context & context_) : context(context_) {}
+    explicit ExpressionActionsChain(ContextPtr context_) : WithContext(context_) {}
 
 
     struct Step
@@ -241,7 +241,6 @@ struct ExpressionActionsChain
     using StepPtr = std::unique_ptr<Step>;
     using Steps = std::vector<StepPtr>;
 
-    const Context & context;
     Steps steps;
 
     void addStep(NameSet non_constant_inputs = {});
diff --git a/src/Interpreters/ExpressionActionsSettings.cpp b/src/Interpreters/ExpressionActionsSettings.cpp
index e23a2a14cc7..a9495628d6f 100644
--- a/src/Interpreters/ExpressionActionsSettings.cpp
+++ b/src/Interpreters/ExpressionActionsSettings.cpp
@@ -1,4 +1,5 @@
 #include <Interpreters/ExpressionActionsSettings.h>
+
 #include <Core/Settings.h>
 #include <Interpreters/Context.h>
 
@@ -16,9 +17,9 @@ ExpressionActionsSettings ExpressionActionsSettings::fromSettings(const Settings
     return settings;
 }
 
-ExpressionActionsSettings ExpressionActionsSettings::fromContext(const Context & from)
+ExpressionActionsSettings ExpressionActionsSettings::fromContext(ContextPtr from)
 {
-    return fromSettings(from.getSettingsRef());
+    return fromSettings(from->getSettingsRef());
 }
 
 }
diff --git a/src/Interpreters/ExpressionActionsSettings.h b/src/Interpreters/ExpressionActionsSettings.h
index f424445e7a4..06351136a9a 100644
--- a/src/Interpreters/ExpressionActionsSettings.h
+++ b/src/Interpreters/ExpressionActionsSettings.h
@@ -1,12 +1,13 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+
 #include <cstddef>
 
 namespace DB
 {
 
 struct Settings;
-class Context;
 
 struct ExpressionActionsSettings
 {
@@ -17,7 +18,7 @@ struct ExpressionActionsSettings
     size_t max_temporary_non_const_columns = 0;
 
     static ExpressionActionsSettings fromSettings(const Settings & from);
-    static ExpressionActionsSettings fromContext(const Context & from);
+    static ExpressionActionsSettings fromContext(ContextPtr from);
 };
 
 }
diff --git a/src/Interpreters/ExpressionAnalyzer.cpp b/src/Interpreters/ExpressionAnalyzer.cpp
index 4d2cebc9900..0a281436183 100644
--- a/src/Interpreters/ExpressionAnalyzer.cpp
+++ b/src/Interpreters/ExpressionAnalyzer.cpp
@@ -128,11 +128,12 @@ ExpressionAnalyzer::ExtractedSettings::ExtractedSettings(const Settings & settin
 ExpressionAnalyzer::ExpressionAnalyzer(
     const ASTPtr & query_,
     const TreeRewriterResultPtr & syntax_analyzer_result_,
-    const Context & context_,
+    ContextPtr context_,
     size_t subquery_depth_,
     bool do_global,
     SubqueriesForSets subqueries_for_sets_)
-    : query(query_), context(context_), settings(context.getSettings())
+    : WithContext(context_)
+    , query(query_), settings(getContext()->getSettings())
     , subquery_depth(subquery_depth_)
     , syntax(syntax_analyzer_result_)
 {
@@ -292,7 +293,7 @@ void ExpressionAnalyzer::initGlobalSubqueriesAndExternalTables(bool do_global)
 {
     if (do_global)
     {
-        GlobalSubqueriesVisitor::Data subqueries_data(context, subquery_depth, isRemoteStorage(),
+        GlobalSubqueriesVisitor::Data subqueries_data(getContext(), subquery_depth, isRemoteStorage(),
                                                    external_tables, subqueries_for_sets, has_global_subqueries);
         GlobalSubqueriesVisitor(subqueries_data).visit(query);
     }
@@ -312,11 +313,11 @@ void ExpressionAnalyzer::tryMakeSetForIndexFromSubquery(const ASTPtr & subquery_
         return;
     }
 
-    auto interpreter_subquery = interpretSubquery(subquery_or_table_name, context, {}, query_options);
+    auto interpreter_subquery = interpretSubquery(subquery_or_table_name, getContext(), {}, query_options);
     auto io = interpreter_subquery->execute();
     PullingAsyncPipelineExecutor executor(io.pipeline);
 
-    SetPtr set = std::make_shared<Set>(settings.size_limits_for_set, true, context.getSettingsRef().transform_null_in);
+    SetPtr set = std::make_shared<Set>(settings.size_limits_for_set, true, getContext()->getSettingsRef().transform_null_in);
     set->setHeader(executor.getHeader());
 
     Block block;
@@ -340,8 +341,8 @@ SetPtr ExpressionAnalyzer::isPlainStorageSetInSubquery(const ASTPtr & subquery_o
     const auto * table = subquery_or_table_name->as<ASTIdentifier>();
     if (!table)
         return nullptr;
-    auto table_id = context.resolveStorageID(subquery_or_table_name);
-    const auto storage = DatabaseCatalog::instance().getTable(table_id, context);
+    auto table_id = getContext()->resolveStorageID(subquery_or_table_name);
+    const auto storage = DatabaseCatalog::instance().getTable(table_id, getContext());
     if (storage->getName() != "Set")
         return nullptr;
     const auto storage_set = std::dynamic_pointer_cast<StorageSet>(storage);
@@ -375,7 +376,7 @@ void SelectQueryExpressionAnalyzer::makeSetsForIndex(const ASTPtr & node)
         const IAST & args = *func->arguments;
         const ASTPtr & left_in_operand = args.children.at(0);
 
-        if (storage()->mayBenefitFromIndexForIn(left_in_operand, context, metadata_snapshot))
+        if (storage()->mayBenefitFromIndexForIn(left_in_operand, getContext(), metadata_snapshot))
         {
             const ASTPtr & arg = args.children.at(1);
             if (arg->as<ASTSubquery>() || arg->as<ASTIdentifier>())
@@ -389,7 +390,7 @@ void SelectQueryExpressionAnalyzer::makeSetsForIndex(const ASTPtr & node)
                 getRootActions(left_in_operand, true, temp_actions);
 
                 if (temp_actions->tryFindInIndex(left_in_operand->getColumnName()))
-                    makeExplicitSet(func, *temp_actions, true, context,
+                    makeExplicitSet(func, *temp_actions, true, getContext(),
                         settings.size_limits_for_set, prepared_sets);
             }
         }
@@ -400,7 +401,7 @@ void SelectQueryExpressionAnalyzer::makeSetsForIndex(const ASTPtr & node)
 void ExpressionAnalyzer::getRootActions(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts)
 {
     LogAST log;
-    ActionsVisitor::Data visitor_data(context, settings.size_limits_for_set, subquery_depth,
+    ActionsVisitor::Data visitor_data(getContext(), settings.size_limits_for_set, subquery_depth,
                                    sourceColumns(), std::move(actions), prepared_sets, subqueries_for_sets,
                                    no_subqueries, false, only_consts, !isRemoteStorage());
     ActionsVisitor(visitor_data, log.stream()).visit(ast);
@@ -411,7 +412,7 @@ void ExpressionAnalyzer::getRootActions(const ASTPtr & ast, bool no_subqueries,
 void ExpressionAnalyzer::getRootActionsNoMakeSet(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts)
 {
     LogAST log;
-    ActionsVisitor::Data visitor_data(context, settings.size_limits_for_set, subquery_depth,
+    ActionsVisitor::Data visitor_data(getContext(), settings.size_limits_for_set, subquery_depth,
                                    sourceColumns(), std::move(actions), prepared_sets, subqueries_for_sets,
                                    no_subqueries, true, only_consts, !isRemoteStorage());
     ActionsVisitor(visitor_data, log.stream()).visit(ast);
@@ -421,7 +422,7 @@ void ExpressionAnalyzer::getRootActionsNoMakeSet(const ASTPtr & ast, bool no_sub
 void ExpressionAnalyzer::getRootActionsForHaving(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts)
 {
     LogAST log;
-    ActionsVisitor::Data visitor_data(context, settings.size_limits_for_set, subquery_depth,
+    ActionsVisitor::Data visitor_data(getContext(), settings.size_limits_for_set, subquery_depth,
                                    sourceColumns(), std::move(actions), prepared_sets, subqueries_for_sets,
                                    no_subqueries, false, only_consts, true);
     ActionsVisitor(visitor_data, log.stream()).visit(ast);
@@ -532,7 +533,7 @@ void ExpressionAnalyzer::makeWindowDescriptions(ActionsDAGPtr actions)
 {
     // Convenient to check here because at least we have the Context.
     if (!syntax->window_function_asts.empty() &&
-        !context.getSettingsRef().allow_experimental_window_functions)
+        !getContext()->getSettingsRef().allow_experimental_window_functions)
     {
         throw Exception(ErrorCodes::NOT_IMPLEMENTED,
             "The support for window functions is experimental and will change"
@@ -685,7 +686,7 @@ ArrayJoinActionPtr ExpressionAnalyzer::addMultipleArrayJoinAction(ActionsDAGPtr
         result_columns.insert(result_source.first);
     }
 
-    return std::make_shared<ArrayJoinAction>(result_columns, array_join_is_left, context);
+    return std::make_shared<ArrayJoinAction>(result_columns, array_join_is_left, getContext());
 }
 
 ArrayJoinActionPtr SelectQueryExpressionAnalyzer::appendArrayJoin(ExpressionActionsChain & chain, ActionsDAGPtr & before_array_join, bool only_types)
@@ -745,21 +746,21 @@ static JoinPtr tryGetStorageJoin(std::shared_ptr<TableJoin> analyzed_join)
     return {};
 }
 
-static ExpressionActionsPtr createJoinedBlockActions(const Context & context, const TableJoin & analyzed_join)
+static ExpressionActionsPtr createJoinedBlockActions(ContextPtr context, const TableJoin & analyzed_join)
 {
     ASTPtr expression_list = analyzed_join.rightKeysList();
     auto syntax_result = TreeRewriter(context).analyze(expression_list, analyzed_join.columnsFromJoinedTable());
     return ExpressionAnalyzer(expression_list, syntax_result, context).getActions(true, false);
 }
 
-static bool allowDictJoin(StoragePtr joined_storage, const Context & context, String & dict_name, String & key_name)
+static bool allowDictJoin(StoragePtr joined_storage, ContextPtr context, String & dict_name, String & key_name)
 {
     const auto * dict = dynamic_cast<const StorageDictionary *>(joined_storage.get());
     if (!dict)
         return false;
 
     dict_name = dict->dictionaryName();
-    auto dictionary = context.getExternalDictionariesLoader().getDictionary(dict_name, context);
+    auto dictionary = context->getExternalDictionariesLoader().getDictionary(dict_name, context);
     if (!dictionary)
         return false;
 
@@ -772,7 +773,7 @@ static bool allowDictJoin(StoragePtr joined_storage, const Context & context, St
     return false;
 }
 
-static std::shared_ptr<IJoin> makeJoin(std::shared_ptr<TableJoin> analyzed_join, const Block & sample_block, const Context & context)
+static std::shared_ptr<IJoin> makeJoin(std::shared_ptr<TableJoin> analyzed_join, const Block & sample_block, ContextPtr context)
 {
     bool allow_merge_join = analyzed_join->allowMergeJoin();
 
@@ -813,7 +814,7 @@ JoinPtr SelectQueryExpressionAnalyzer::makeTableJoin(
     if (!subquery_for_join.join)
     {
         /// Actions which need to be calculated on joined block.
-        ExpressionActionsPtr joined_block_actions = createJoinedBlockActions(context, analyzedJoin());
+        ExpressionActionsPtr joined_block_actions = createJoinedBlockActions(getContext(), analyzedJoin());
 
         Names original_right_columns;
         if (!subquery_for_join.source)
@@ -828,7 +829,7 @@ JoinPtr SelectQueryExpressionAnalyzer::makeTableJoin(
                 *   in the subquery_for_set object this subquery is exposed as source and the temporary table _data1 as the `table`.
                 * - this function shows the expression JOIN _data1.
                 */
-            auto interpreter = interpretSubquery(join_element.table_expression, context, original_right_columns, query_options);
+            auto interpreter = interpretSubquery(join_element.table_expression, getContext(), original_right_columns, query_options);
 
             subquery_for_join.makeSource(interpreter, std::move(required_columns_with_aliases));
         }
@@ -841,9 +842,9 @@ JoinPtr SelectQueryExpressionAnalyzer::makeTableJoin(
         if (need_convert)
             subquery_for_join.addJoinActions(std::make_shared<ExpressionActions>(
                 syntax->analyzed_join->rightConvertingActions(),
-                ExpressionActionsSettings::fromContext(context)));
+                ExpressionActionsSettings::fromContext(getContext())));
 
-        subquery_for_join.join = makeJoin(syntax->analyzed_join, subquery_for_join.sample_block, context);
+        subquery_for_join.join = makeJoin(syntax->analyzed_join, subquery_for_join.sample_block, getContext());
 
         /// Do not make subquery for join over dictionary.
         if (syntax->analyzed_join->dictionary_reader)
@@ -893,7 +894,7 @@ ActionsDAGPtr SelectQueryExpressionAnalyzer::appendPrewhere(
         auto tmp_actions_dag = std::make_shared<ActionsDAG>(sourceColumns());
         getRootActions(select_query->prewhere(), only_types, tmp_actions_dag);
         tmp_actions_dag->removeUnusedActions(NameSet{prewhere_column_name});
-        auto tmp_actions = std::make_shared<ExpressionActions>(tmp_actions_dag, ExpressionActionsSettings::fromContext(context));
+        auto tmp_actions = std::make_shared<ExpressionActions>(tmp_actions_dag, ExpressionActionsSettings::fromContext(getContext()));
         auto required_columns = tmp_actions->getRequiredColumns();
         NameSet required_source_columns(required_columns.begin(), required_columns.end());
         required_source_columns.insert(first_action_names.begin(), first_action_names.end());
@@ -1011,7 +1012,8 @@ bool SelectQueryExpressionAnalyzer::appendGroupBy(ExpressionActionsChain & chain
         {
             auto actions_dag = std::make_shared<ActionsDAG>(columns_after_join);
             getRootActions(child, only_types, actions_dag);
-            group_by_elements_actions.emplace_back(std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(context)));
+            group_by_elements_actions.emplace_back(
+                std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(getContext())));
         }
     }
 
@@ -1170,7 +1172,7 @@ ActionsDAGPtr SelectQueryExpressionAnalyzer::appendOrderBy(ExpressionActionsChai
             auto actions_dag = std::make_shared<ActionsDAG>(columns_after_join);
             getRootActions(child, only_types, actions_dag);
             order_by_elements_actions.emplace_back(
-                std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(context)));
+                std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(getContext())));
         }
     }
 
@@ -1330,7 +1332,8 @@ ActionsDAGPtr ExpressionAnalyzer::getActionsDAG(bool add_aliases, bool project_r
 
 ExpressionActionsPtr ExpressionAnalyzer::getActions(bool add_aliases, bool project_result)
 {
-    return std::make_shared<ExpressionActions>(getActionsDAG(add_aliases, project_result), ExpressionActionsSettings::fromContext(context));
+    return std::make_shared<ExpressionActions>(
+        getActionsDAG(add_aliases, project_result), ExpressionActionsSettings::fromContext(getContext()));
 }
 
 
@@ -1339,12 +1342,12 @@ ExpressionActionsPtr ExpressionAnalyzer::getConstActions(const ColumnsWithTypeAn
     auto actions = std::make_shared<ActionsDAG>(constant_inputs);
 
     getRootActions(query, true, actions, true);
-    return std::make_shared<ExpressionActions>(actions, ExpressionActionsSettings::fromContext(context));
+    return std::make_shared<ExpressionActions>(actions, ExpressionActionsSettings::fromContext(getContext()));
 }
 
 ActionsDAGPtr SelectQueryExpressionAnalyzer::simpleSelectActions()
 {
-    ExpressionActionsChain new_chain(context);
+    ExpressionActionsChain new_chain(getContext());
     appendSelect(new_chain, false);
     return new_chain.getLastActions();
 }
@@ -1371,8 +1374,8 @@ ExpressionAnalysisResult::ExpressionAnalysisResult(
         */
 
     const ASTSelectQuery & query = *query_analyzer.getSelectQuery();
-    const Context & context = query_analyzer.context;
-    const Settings & settings = context.getSettingsRef();
+    auto context = query_analyzer.getContext();
+    const Settings & settings = context->getSettingsRef();
     const ConstStoragePtr & storage = query_analyzer.storage();
 
     bool finalized = false;
@@ -1432,7 +1435,7 @@ ExpressionAnalysisResult::ExpressionAnalysisResult(
                 {
                     ExpressionActions(
                         prewhere_info->prewhere_actions,
-                        ExpressionActionsSettings::fromSettings(context.getSettingsRef())).execute(before_prewhere_sample);
+                        ExpressionActionsSettings::fromSettings(context->getSettingsRef())).execute(before_prewhere_sample);
                     auto & column_elem = before_prewhere_sample.getByName(query.prewhere()->getColumnName());
                     /// If the filter column is a constant, record it.
                     if (column_elem.column)
@@ -1467,7 +1470,7 @@ ExpressionAnalysisResult::ExpressionAnalysisResult(
                 {
                     ExpressionActions(
                         before_where,
-                        ExpressionActionsSettings::fromSettings(context.getSettingsRef())).execute(before_where_sample);
+                        ExpressionActionsSettings::fromSettings(context->getSettingsRef())).execute(before_where_sample);
                     auto & column_elem = before_where_sample.getByName(query.where()->getColumnName());
                     /// If the filter column is a constant, record it.
                     if (column_elem.column)
@@ -1481,7 +1484,7 @@ ExpressionAnalysisResult::ExpressionAnalysisResult(
         {
             /// TODO correct conditions
             optimize_aggregation_in_order =
-                    context.getSettingsRef().optimize_aggregation_in_order
+                    context->getSettingsRef().optimize_aggregation_in_order
                     && storage && query.groupBy();
 
             query_analyzer.appendGroupBy(chain, only_types || !first_stage, optimize_aggregation_in_order, group_by_elements_actions);
diff --git a/src/Interpreters/ExpressionAnalyzer.h b/src/Interpreters/ExpressionAnalyzer.h
index 58893091882..fe53b44690e 100644
--- a/src/Interpreters/ExpressionAnalyzer.h
+++ b/src/Interpreters/ExpressionAnalyzer.h
@@ -16,7 +16,6 @@ namespace DB
 {
 
 class Block;
-class Context;
 struct Settings;
 
 struct ExpressionActionsChain;
@@ -78,7 +77,7 @@ struct ExpressionAnalyzerData
   *
   * NOTE: if `ast` is a SELECT query from a table, the structure of this table should not change during the lifetime of ExpressionAnalyzer.
   */
-class ExpressionAnalyzer : protected ExpressionAnalyzerData, private boost::noncopyable
+class ExpressionAnalyzer : protected ExpressionAnalyzerData, private boost::noncopyable, protected WithContext
 {
 private:
     /// Extracts settings to enlight which are used (and avoid copy of others).
@@ -96,7 +95,7 @@ public:
     ExpressionAnalyzer(
         const ASTPtr & query_,
         const TreeRewriterResultPtr & syntax_analyzer_result_,
-        const Context & context_)
+        ContextPtr context_)
     :   ExpressionAnalyzer(query_, syntax_analyzer_result_, context_, 0, false, {})
     {}
 
@@ -145,13 +144,12 @@ protected:
     ExpressionAnalyzer(
         const ASTPtr & query_,
         const TreeRewriterResultPtr & syntax_analyzer_result_,
-        const Context & context_,
+        ContextPtr context_,
         size_t subquery_depth_,
         bool do_global_,
         SubqueriesForSets subqueries_for_sets_);
 
     ASTPtr query;
-    const Context & context;
     const ExtractedSettings settings;
     size_t subquery_depth;
 
@@ -272,7 +270,7 @@ public:
     SelectQueryExpressionAnalyzer(
         const ASTPtr & query_,
         const TreeRewriterResultPtr & syntax_analyzer_result_,
-        const Context & context_,
+        ContextPtr context_,
         const StorageMetadataPtr & metadata_snapshot_,
         const NameSet & required_result_columns_ = {},
         bool do_global_ = false,
diff --git a/src/Interpreters/ExternalDictionariesLoader.cpp b/src/Interpreters/ExternalDictionariesLoader.cpp
index 8df29459b72..1fc0f95c846 100644
--- a/src/Interpreters/ExternalDictionariesLoader.cpp
+++ b/src/Interpreters/ExternalDictionariesLoader.cpp
@@ -23,9 +23,9 @@ namespace ErrorCodes
 }
 
 /// Must not acquire Context lock in constructor to avoid possibility of deadlocks.
-ExternalDictionariesLoader::ExternalDictionariesLoader(Context & global_context_)
+ExternalDictionariesLoader::ExternalDictionariesLoader(ContextPtr global_context_)
     : ExternalLoader("external dictionary", &Poco::Logger::get("ExternalDictionariesLoader"))
-    , global_context(global_context_)
+    , WithContext(global_context_)
 {
     setConfigSettings({"dictionary", "name", "database", "uuid"});
     enableAsyncLoading(true);
@@ -40,31 +40,31 @@ ExternalLoader::LoadablePtr ExternalDictionariesLoader::create(
     /// For dictionaries from databases (created with DDL queries) we have to perform
     /// additional checks, so we identify them here.
     bool dictionary_from_database = !repository_name.empty();
-    return DictionaryFactory::instance().create(name, config, key_in_config, global_context, dictionary_from_database);
+    return DictionaryFactory::instance().create(name, config, key_in_config, getContext(), dictionary_from_database);
 }
 
-ExternalDictionariesLoader::DictPtr ExternalDictionariesLoader::getDictionary(const std::string & dictionary_name, const Context & context) const
+ExternalDictionariesLoader::DictPtr ExternalDictionariesLoader::getDictionary(const std::string & dictionary_name, ContextPtr local_context) const
 {
-    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, context.getCurrentDatabase());
+    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, local_context->getCurrentDatabase());
     return std::static_pointer_cast<const IDictionary>(load(resolved_dictionary_name));
 }
 
-ExternalDictionariesLoader::DictPtr ExternalDictionariesLoader::tryGetDictionary(const std::string & dictionary_name, const Context & context) const
+ExternalDictionariesLoader::DictPtr ExternalDictionariesLoader::tryGetDictionary(const std::string & dictionary_name, ContextPtr local_context) const
 {
-    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, context.getCurrentDatabase());
+    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, local_context->getCurrentDatabase());
     return std::static_pointer_cast<const IDictionary>(tryLoad(resolved_dictionary_name));
 }
 
 
-void ExternalDictionariesLoader::reloadDictionary(const std::string & dictionary_name, const Context & context) const
+void ExternalDictionariesLoader::reloadDictionary(const std::string & dictionary_name, ContextPtr local_context) const
 {
-    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, context.getCurrentDatabase());
+    std::string resolved_dictionary_name = resolveDictionaryName(dictionary_name, local_context->getCurrentDatabase());
     loadOrReload(resolved_dictionary_name);
 }
 
-DictionaryStructure ExternalDictionariesLoader::getDictionaryStructure(const std::string & dictionary_name, const Context & query_context) const
+DictionaryStructure ExternalDictionariesLoader::getDictionaryStructure(const std::string & dictionary_name, ContextPtr query_context) const
 {
-    std::string resolved_name = resolveDictionaryName(dictionary_name, query_context.getCurrentDatabase());
+    std::string resolved_name = resolveDictionaryName(dictionary_name, query_context->getCurrentDatabase());
 
     auto load_result = getLoadResult(resolved_name);
     if (!load_result.config)
@@ -110,7 +110,7 @@ std::string ExternalDictionariesLoader::resolveDictionaryNameFromDatabaseCatalog
     std::string maybe_database_name = name.substr(0, pos);
     std::string maybe_table_name = name.substr(pos + 1);
 
-    auto [db, table] = DatabaseCatalog::instance().tryGetDatabaseAndTable({maybe_database_name, maybe_table_name}, global_context);
+    auto [db, table] = DatabaseCatalog::instance().tryGetDatabaseAndTable({maybe_database_name, maybe_table_name}, getContext());
     if (!db)
         return name;
     assert(table);
diff --git a/src/Interpreters/ExternalDictionariesLoader.h b/src/Interpreters/ExternalDictionariesLoader.h
index ce5b2512741..06f64ef30c5 100644
--- a/src/Interpreters/ExternalDictionariesLoader.h
+++ b/src/Interpreters/ExternalDictionariesLoader.h
@@ -1,32 +1,33 @@
 #pragma once
 
+#include <Dictionaries/IDictionary.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/ExternalLoader.h>
+#include <Common/quoteString.h>
+
 #include <memory>
 
-#include <Common/quoteString.h>
-#include <Interpreters/ExternalLoader.h>
-#include <Dictionaries/IDictionary.h>
-
 namespace DB
 {
-class Context;
+
 class IExternalLoaderConfigRepository;
 
 /// Manages user-defined dictionaries.
-class ExternalDictionariesLoader : public ExternalLoader
+class ExternalDictionariesLoader : public ExternalLoader, WithContext
 {
 public:
     using DictPtr = std::shared_ptr<const IDictionary>;
 
     /// Dictionaries will be loaded immediately and then will be updated in separate thread, each 'reload_period' seconds.
-    explicit ExternalDictionariesLoader(Context & global_context_);
+    explicit ExternalDictionariesLoader(ContextPtr global_context_);
 
-    DictPtr getDictionary(const std::string & dictionary_name, const Context & context) const;
+    DictPtr getDictionary(const std::string & dictionary_name, ContextPtr context) const;
 
-    DictPtr tryGetDictionary(const std::string & dictionary_name, const Context & context) const;
+    DictPtr tryGetDictionary(const std::string & dictionary_name, ContextPtr context) const;
 
-    void reloadDictionary(const std::string & dictionary_name, const Context & context) const;
+    void reloadDictionary(const std::string & dictionary_name, ContextPtr context) const;
 
-    DictionaryStructure getDictionaryStructure(const std::string & dictionary_name, const Context & context) const;
+    DictionaryStructure getDictionaryStructure(const std::string & dictionary_name, ContextPtr context) const;
 
     static DictionaryStructure getDictionaryStructure(const Poco::Util::AbstractConfiguration & config, const std::string & key_in_config = "dictionary");
 
@@ -45,9 +46,6 @@ protected:
 
     friend class StorageSystemDictionaries;
     friend class DatabaseDictionary;
-
-private:
-    Context & global_context;
 };
 
 }
diff --git a/src/Interpreters/ExternalLoaderDatabaseConfigRepository.cpp b/src/Interpreters/ExternalLoaderDatabaseConfigRepository.cpp
index 41269b91b5f..a8b65a18983 100644
--- a/src/Interpreters/ExternalLoaderDatabaseConfigRepository.cpp
+++ b/src/Interpreters/ExternalLoaderDatabaseConfigRepository.cpp
@@ -17,7 +17,7 @@ namespace ErrorCodes
 namespace
 {
     String trimDatabaseName(const std::string & loadable_definition_name, const String & database_name,
-                            const IDatabase & database, const Context & global_context)
+                            const IDatabase & database, ContextPtr global_context)
     {
         bool is_atomic_database = database.getUUID() != UUIDHelpers::Nil;
         if (is_atomic_database)
@@ -42,8 +42,8 @@ namespace
 }
 
 
-ExternalLoaderDatabaseConfigRepository::ExternalLoaderDatabaseConfigRepository(IDatabase & database_, const Context & context_)
-    : global_context(context_.getGlobalContext())
+ExternalLoaderDatabaseConfigRepository::ExternalLoaderDatabaseConfigRepository(IDatabase & database_, ContextPtr context_)
+    : WithContext(context_->getGlobalContext())
     , database_name(database_.getDatabaseName())
     , database(database_)
 {
@@ -51,19 +51,19 @@ ExternalLoaderDatabaseConfigRepository::ExternalLoaderDatabaseConfigRepository(I
 
 LoadablesConfigurationPtr ExternalLoaderDatabaseConfigRepository::load(const std::string & loadable_definition_name)
 {
-    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, global_context);
+    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, getContext());
     return database.getDictionaryConfiguration(dict_name);
 }
 
 bool ExternalLoaderDatabaseConfigRepository::exists(const std::string & loadable_definition_name)
 {
-    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, global_context);
+    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, getContext());
     return database.isDictionaryExist(dict_name);
 }
 
 Poco::Timestamp ExternalLoaderDatabaseConfigRepository::getUpdateTime(const std::string & loadable_definition_name)
 {
-    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, global_context);
+    auto dict_name = trimDatabaseName(loadable_definition_name, database_name, database, getContext());
     return database.getObjectMetadataModificationTime(dict_name);
 }
 
diff --git a/src/Interpreters/ExternalLoaderDatabaseConfigRepository.h b/src/Interpreters/ExternalLoaderDatabaseConfigRepository.h
index 59dad1274e0..baa99bc5610 100644
--- a/src/Interpreters/ExternalLoaderDatabaseConfigRepository.h
+++ b/src/Interpreters/ExternalLoaderDatabaseConfigRepository.h
@@ -9,10 +9,10 @@ namespace DB
 
 /// Repository from database, which stores dictionary definitions on disk.
 /// Tracks update time and existence of .sql files through IDatabase.
-class ExternalLoaderDatabaseConfigRepository : public IExternalLoaderConfigRepository
+class ExternalLoaderDatabaseConfigRepository : public IExternalLoaderConfigRepository, WithContext
 {
 public:
-    ExternalLoaderDatabaseConfigRepository(IDatabase & database_, const Context & global_context_);
+    ExternalLoaderDatabaseConfigRepository(IDatabase & database_, ContextPtr global_context_);
 
     const std::string & getName() const override { return database_name; }
 
@@ -25,7 +25,6 @@ public:
     LoadablesConfigurationPtr load(const std::string & loadable_definition_name) override;
 
 private:
-    const Context & global_context;
     const String database_name;
     IDatabase & database;
 };
diff --git a/src/Interpreters/ExternalModelsLoader.cpp b/src/Interpreters/ExternalModelsLoader.cpp
index 4e9ddb78241..317cf0bf1c9 100644
--- a/src/Interpreters/ExternalModelsLoader.cpp
+++ b/src/Interpreters/ExternalModelsLoader.cpp
@@ -10,9 +10,8 @@ namespace ErrorCodes
 }
 
 
-ExternalModelsLoader::ExternalModelsLoader(Context & context_)
-    : ExternalLoader("external model", &Poco::Logger::get("ExternalModelsLoader"))
-    , context(context_)
+ExternalModelsLoader::ExternalModelsLoader(ContextPtr context_)
+    : ExternalLoader("external model", &Poco::Logger::get("ExternalModelsLoader")), WithContext(context_)
 {
     setConfigSettings({"model", "name", {}, {}});
     enablePeriodicUpdates(true);
@@ -30,7 +29,7 @@ std::shared_ptr<const IExternalLoadable> ExternalModelsLoader::create(
     {
         return std::make_unique<CatBoostModel>(
                 name, config.getString(config_prefix + ".path"),
-                context.getConfigRef().getString("catboost_dynamic_library_path"),
+                getContext()->getConfigRef().getString("catboost_dynamic_library_path"),
                 lifetime
         );
     }
diff --git a/src/Interpreters/ExternalModelsLoader.h b/src/Interpreters/ExternalModelsLoader.h
index 3f09512338d..ebf6de67540 100644
--- a/src/Interpreters/ExternalModelsLoader.h
+++ b/src/Interpreters/ExternalModelsLoader.h
@@ -1,24 +1,24 @@
 #pragma once
 
 #include <Interpreters/CatBoostModel.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/ExternalLoader.h>
 #include <common/logger_useful.h>
+
 #include <memory>
 
 
 namespace DB
 {
 
-class Context;
-
 /// Manages user-defined models.
-class ExternalModelsLoader : public ExternalLoader
+class ExternalModelsLoader : public ExternalLoader, WithContext
 {
 public:
     using ModelPtr = std::shared_ptr<const IModel>;
 
     /// Models will be loaded immediately and then will be updated in separate thread, each 'reload_period' seconds.
-    ExternalModelsLoader(Context & context_);
+    explicit ExternalModelsLoader(ContextPtr context_);
 
     ModelPtr getModel(const std::string & name) const
     {
@@ -30,9 +30,6 @@ protected:
             const std::string & config_prefix, const std::string & repository_name) const override;
 
     friend class StorageSystemModels;
-private:
-
-    Context & context;
 };
 
 }
diff --git a/src/Interpreters/ExtractExpressionInfoVisitor.cpp b/src/Interpreters/ExtractExpressionInfoVisitor.cpp
index 64c23cd4fd1..2d46fe08e95 100644
--- a/src/Interpreters/ExtractExpressionInfoVisitor.cpp
+++ b/src/Interpreters/ExtractExpressionInfoVisitor.cpp
@@ -40,7 +40,7 @@ void ExpressionInfoMatcher::visit(const ASTFunction & ast_function, const ASTPtr
     }
     else
     {
-        const auto & function = FunctionFactory::instance().tryGet(ast_function.name, data.context);
+        const auto & function = FunctionFactory::instance().tryGet(ast_function.name, data.getContext());
 
         /// Skip lambda, tuple and other special functions
         if (function)
@@ -82,11 +82,12 @@ bool ExpressionInfoMatcher::needChildVisit(const ASTPtr & node, const ASTPtr &)
     return !node->as<ASTSubquery>();
 }
 
-bool hasNonRewritableFunction(const ASTPtr & node, const Context & context)
+bool hasNonRewritableFunction(const ASTPtr & node, ContextPtr context)
 {
     for (const auto & select_expression : node->children)
     {
-        ExpressionInfoVisitor::Data expression_info{.context = context, .tables = {}};
+        TablesWithColumns tables;
+        ExpressionInfoVisitor::Data expression_info{WithContext{context}, tables};
         ExpressionInfoVisitor(expression_info).visit(select_expression);
 
         if (expression_info.is_stateful_function
diff --git a/src/Interpreters/ExtractExpressionInfoVisitor.h b/src/Interpreters/ExtractExpressionInfoVisitor.h
index d05415490e6..c84e243ce2e 100644
--- a/src/Interpreters/ExtractExpressionInfoVisitor.h
+++ b/src/Interpreters/ExtractExpressionInfoVisitor.h
@@ -1,21 +1,20 @@
 #pragma once
 
-#include <Parsers/IAST_fwd.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Interpreters/InDepthNodeVisitor.h>
 #include <Parsers/ASTFunction.h>
 #include <Parsers/ASTIdentifier.h>
-#include <Interpreters/InDepthNodeVisitor.h>
-#include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Parsers/IAST_fwd.h>
 
 namespace DB
 {
 
-class Context;
 
 struct ExpressionInfoMatcher
 {
-    struct Data
+    struct Data : public WithContext
     {
-        const Context & context;
         const TablesWithColumns & tables;
 
         bool is_array_join = false;
@@ -37,6 +36,6 @@ struct ExpressionInfoMatcher
 
 using ExpressionInfoVisitor = ConstInDepthNodeVisitor<ExpressionInfoMatcher, true>;
 
-bool hasNonRewritableFunction(const ASTPtr & node, const Context & context);
+bool hasNonRewritableFunction(const ASTPtr & node, ContextPtr context);
 
 }
diff --git a/src/Interpreters/GlobalSubqueriesVisitor.h b/src/Interpreters/GlobalSubqueriesVisitor.h
index 80d133ebea6..1aac27396ed 100644
--- a/src/Interpreters/GlobalSubqueriesVisitor.h
+++ b/src/Interpreters/GlobalSubqueriesVisitor.h
@@ -1,37 +1,36 @@
 #pragma once
 
-#include <Parsers/IAST.h>
-#include <Parsers/ASTSubquery.h>
-#include <Parsers/ASTLiteral.h>
-#include <Parsers/ASTFunction.h>
-#include <Parsers/ASTTablesInSelectQuery.h>
-#include <Parsers/ASTSelectQuery.h>
-#include <Parsers/ASTIdentifier.h>
-#include <Interpreters/interpretSubquery.h>
-#include <Common/typeid_cast.h>
 #include <Core/Block.h>
 #include <Core/NamesAndTypes.h>
 #include <Databases/IDatabase.h>
 #include <IO/WriteHelpers.h>
-#include <Interpreters/InDepthNodeVisitor.h>
-#include <Interpreters/IdentifierSemantic.h>
 #include <Interpreters/Context.h>
+#include <Interpreters/IdentifierSemantic.h>
+#include <Interpreters/InDepthNodeVisitor.h>
+#include <Interpreters/interpretSubquery.h>
+#include <Parsers/ASTFunction.h>
+#include <Parsers/ASTIdentifier.h>
+#include <Parsers/ASTLiteral.h>
+#include <Parsers/ASTSelectQuery.h>
+#include <Parsers/ASTSubquery.h>
+#include <Parsers/ASTTablesInSelectQuery.h>
+#include <Parsers/IAST.h>
 #include <Processors/Executors/PullingPipelineExecutor.h>
+#include <Common/typeid_cast.h>
 
 namespace DB
 {
+
 namespace ErrorCodes
 {
     extern const int WRONG_GLOBAL_SUBQUERY;
 }
 
-
 class GlobalSubqueriesMatcher
 {
 public:
-    struct Data
+    struct Data : WithContext
     {
-        const Context & context;
         size_t subquery_depth;
         bool is_remote;
         size_t external_table_id;
@@ -39,16 +38,22 @@ public:
         SubqueriesForSets & subqueries_for_sets;
         bool & has_global_subqueries;
 
-        Data(const Context & context_, size_t subquery_depth_, bool is_remote_,
-             TemporaryTablesMapping & tables, SubqueriesForSets & subqueries_for_sets_, bool & has_global_subqueries_)
-        :   context(context_),
-            subquery_depth(subquery_depth_),
-            is_remote(is_remote_),
-            external_table_id(1),
-            external_tables(tables),
-            subqueries_for_sets(subqueries_for_sets_),
-            has_global_subqueries(has_global_subqueries_)
-        {}
+        Data(
+            ContextPtr context_,
+            size_t subquery_depth_,
+            bool is_remote_,
+            TemporaryTablesMapping & tables,
+            SubqueriesForSets & subqueries_for_sets_,
+            bool & has_global_subqueries_)
+            : WithContext(context_)
+            , subquery_depth(subquery_depth_)
+            , is_remote(is_remote_)
+            , external_table_id(1)
+            , external_tables(tables)
+            , subqueries_for_sets(subqueries_for_sets_)
+            , has_global_subqueries(has_global_subqueries_)
+        {
+        }
 
         void addExternalStorage(ASTPtr & ast, bool set_alias = false)
         {
@@ -80,7 +85,7 @@ public:
                 /// If this is already an external table, you do not need to add anything. Just remember its presence.
                 auto temporary_table_name = getIdentifierName(subquery_or_table_name);
                 bool exists_in_local_map = external_tables.end() != external_tables.find(temporary_table_name);
-                bool exists_in_context = context.tryResolveStorageID(StorageID("", temporary_table_name), Context::ResolveExternal);
+                bool exists_in_context = getContext()->tryResolveStorageID(StorageID("", temporary_table_name), Context::ResolveExternal);
                 if (exists_in_local_map || exists_in_context)
                     return;
             }
@@ -97,14 +102,17 @@ public:
                 }
             }
 
-            auto interpreter = interpretSubquery(subquery_or_table_name, context, subquery_depth, {});
+            auto interpreter = interpretSubquery(subquery_or_table_name, getContext(), subquery_depth, {});
 
             Block sample = interpreter->getSampleBlock();
             NamesAndTypesList columns = sample.getNamesAndTypesList();
 
             auto external_storage_holder = std::make_shared<TemporaryTableHolder>(
-                    context, ColumnsDescription{columns}, ConstraintsDescription{}, nullptr,
-                    /*create_for_global_subquery*/ true);
+                getContext(),
+                ColumnsDescription{columns},
+                ConstraintsDescription{},
+                nullptr,
+                /*create_for_global_subquery*/ true);
             StoragePtr external_storage = external_storage_holder->getTable();
 
             /** We replace the subquery with the name of the temporary table.
@@ -136,10 +144,10 @@ public:
 
             external_tables[external_table_name] = external_storage_holder;
 
-            if (context.getSettingsRef().use_index_for_in_with_subqueries)
+            if (getContext()->getSettingsRef().use_index_for_in_with_subqueries)
             {
                 auto external_table = external_storage_holder->getTable();
-                auto table_out = external_table->write({}, external_table->getInMemoryMetadataPtr(), context);
+                auto table_out = external_table->write({}, external_table->getInMemoryMetadataPtr(), getContext());
                 auto io = interpreter->execute();
                 PullingPipelineExecutor executor(io.pipeline);
 
@@ -176,9 +184,7 @@ public:
     static bool needChildVisit(ASTPtr &, const ASTPtr & child)
     {
         /// We do not go into subqueries.
-        if (child->as<ASTSelectQuery>())
-            return false;
-        return true;
+        return !child->as<ASTSelectQuery>();
     }
 
 private:
diff --git a/src/Interpreters/IInterpreter.cpp b/src/Interpreters/IInterpreter.cpp
index b219a9cd923..1b0e9738429 100644
--- a/src/Interpreters/IInterpreter.cpp
+++ b/src/Interpreters/IInterpreter.cpp
@@ -4,7 +4,7 @@
 namespace DB
 {
 void IInterpreter::extendQueryLogElem(
-    QueryLogElement & elem, const ASTPtr & ast, const Context & context, const String & query_database, const String & query_table) const
+    QueryLogElement & elem, const ASTPtr & ast, ContextPtr context, const String & query_database, const String & query_table) const
 {
     if (!query_database.empty() && query_table.empty())
     {
@@ -12,7 +12,8 @@ void IInterpreter::extendQueryLogElem(
     }
     else if (!query_table.empty())
     {
-        auto quoted_database = query_database.empty() ? backQuoteIfNeed(context.getCurrentDatabase()) : backQuoteIfNeed(query_database);
+        auto quoted_database = query_database.empty() ? backQuoteIfNeed(context->getCurrentDatabase())
+                                                      : backQuoteIfNeed(query_database);
         elem.query_databases.insert(quoted_database);
         elem.query_tables.insert(quoted_database + "." + backQuoteIfNeed(query_table));
     }
diff --git a/src/Interpreters/IInterpreter.h b/src/Interpreters/IInterpreter.h
index aaecf735e60..1b4eada3c9f 100644
--- a/src/Interpreters/IInterpreter.h
+++ b/src/Interpreters/IInterpreter.h
@@ -1,13 +1,13 @@
 #pragma once
 
 #include <DataStreams/BlockIO.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
 
 namespace DB
 {
 
 struct QueryLogElement;
-class Context;
 
 /** Interpreters interface for different queries.
   */
@@ -27,11 +27,11 @@ public:
     void extendQueryLogElem(
         QueryLogElement & elem,
         const ASTPtr & ast,
-        const Context & context,
+        ContextPtr context,
         const String & query_database,
         const String & query_table) const;
 
-    virtual void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, const Context &) const {}
+    virtual void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, ContextPtr) const {}
 
     virtual ~IInterpreter() = default;
 };
diff --git a/src/Interpreters/IInterpreterUnionOrSelectQuery.cpp b/src/Interpreters/IInterpreterUnionOrSelectQuery.cpp
index 833625a6f3e..7233ab332dd 100644
--- a/src/Interpreters/IInterpreterUnionOrSelectQuery.cpp
+++ b/src/Interpreters/IInterpreterUnionOrSelectQuery.cpp
@@ -4,7 +4,7 @@
 namespace DB
 {
 
-void IInterpreterUnionOrSelectQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context &) const
+void IInterpreterUnionOrSelectQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr) const
 {
     elem.query_kind = "Select";
 }
diff --git a/src/Interpreters/IInterpreterUnionOrSelectQuery.h b/src/Interpreters/IInterpreterUnionOrSelectQuery.h
index 128072fb103..72723d68161 100644
--- a/src/Interpreters/IInterpreterUnionOrSelectQuery.h
+++ b/src/Interpreters/IInterpreterUnionOrSelectQuery.h
@@ -10,9 +10,9 @@ namespace DB
 class IInterpreterUnionOrSelectQuery : public IInterpreter
 {
 public:
-    IInterpreterUnionOrSelectQuery(const ASTPtr & query_ptr_, const Context & context_, const SelectQueryOptions & options_)
+    IInterpreterUnionOrSelectQuery(const ASTPtr & query_ptr_, ContextPtr context_, const SelectQueryOptions & options_)
         : query_ptr(query_ptr_)
-        , context(std::make_shared<Context>(context_))
+        , context(Context::createCopy(context_))
         , options(options_)
         , max_streams(context->getSettingsRef().max_threads)
     {
@@ -28,11 +28,11 @@ public:
 
     size_t getMaxStreams() const { return max_streams; }
 
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr) const override;
 
 protected:
     ASTPtr query_ptr;
-    std::shared_ptr<Context> context;
+    ContextPtr context;
     Block result_header;
     SelectQueryOptions options;
     size_t max_streams = 1;
diff --git a/src/Interpreters/IdentifierSemantic.cpp b/src/Interpreters/IdentifierSemantic.cpp
index 7c289e03b91..8b8eab219ba 100644
--- a/src/Interpreters/IdentifierSemantic.cpp
+++ b/src/Interpreters/IdentifierSemantic.cpp
@@ -301,7 +301,7 @@ void IdentifiersCollector::visit(const ASTPtr & node, IdentifiersCollector::Data
 }
 
 
-IdentifierMembershipCollector::IdentifierMembershipCollector(const ASTSelectQuery & select, const Context & context)
+IdentifierMembershipCollector::IdentifierMembershipCollector(const ASTSelectQuery & select, ContextPtr context)
 {
     if (ASTPtr with = select.with())
         QueryAliasesNoSubqueriesVisitor(aliases).visit(with);
diff --git a/src/Interpreters/IdentifierSemantic.h b/src/Interpreters/IdentifierSemantic.h
index 9f11d8bdb9d..20ef3248f7c 100644
--- a/src/Interpreters/IdentifierSemantic.h
+++ b/src/Interpreters/IdentifierSemantic.h
@@ -99,7 +99,7 @@ public:
 class IdentifierMembershipCollector
 {
 public:
-    IdentifierMembershipCollector(const ASTSelectQuery & select, const Context & context);
+    IdentifierMembershipCollector(const ASTSelectQuery & select, ContextPtr context);
     std::optional<size_t> getIdentsMembership(ASTPtr ast) const;
 
 private:
diff --git a/src/Interpreters/InJoinSubqueriesPreprocessor.cpp b/src/Interpreters/InJoinSubqueriesPreprocessor.cpp
index 2e922393131..8dc5d95bd89 100644
--- a/src/Interpreters/InJoinSubqueriesPreprocessor.cpp
+++ b/src/Interpreters/InJoinSubqueriesPreprocessor.cpp
@@ -25,9 +25,9 @@ namespace ErrorCodes
 namespace
 {
 
-StoragePtr tryGetTable(const ASTPtr & database_and_table, const Context & context)
+StoragePtr tryGetTable(const ASTPtr & database_and_table, ContextPtr context)
 {
-    auto table_id = context.tryResolveStorageID(database_and_table);
+    auto table_id = context->tryResolveStorageID(database_and_table);
     if (!table_id)
         return {};
     return DatabaseCatalog::instance().tryGetTable(table_id, context);
@@ -35,12 +35,21 @@ StoragePtr tryGetTable(const ASTPtr & database_and_table, const Context & contex
 
 using CheckShardsAndTables = InJoinSubqueriesPreprocessor::CheckShardsAndTables;
 
-struct NonGlobalTableData
+struct NonGlobalTableData : public WithContext
 {
     using TypeToVisit = ASTTableExpression;
 
+    NonGlobalTableData(
+        ContextPtr context_,
+        const CheckShardsAndTables & checker_,
+        std::vector<ASTPtr> & renamed_tables_,
+        ASTFunction * function_,
+        ASTTableJoin * table_join_)
+        : WithContext(context_), checker(checker_), renamed_tables(renamed_tables_), function(function_), table_join(table_join_)
+    {
+    }
+
     const CheckShardsAndTables & checker;
-    const Context & context;
     std::vector<ASTPtr> & renamed_tables;
     ASTFunction * function = nullptr;
     ASTTableJoin * table_join = nullptr;
@@ -55,9 +64,9 @@ struct NonGlobalTableData
 private:
     void renameIfNeeded(ASTPtr & database_and_table)
     {
-        const DistributedProductMode distributed_product_mode = context.getSettingsRef().distributed_product_mode;
+        const DistributedProductMode distributed_product_mode = getContext()->getSettingsRef().distributed_product_mode;
 
-        StoragePtr storage = tryGetTable(database_and_table, context);
+        StoragePtr storage = tryGetTable(database_and_table, getContext());
         if (!storage || !checker.hasAtLeastTwoShards(*storage))
             return;
 
@@ -119,11 +128,17 @@ using NonGlobalTableVisitor = InDepthNodeVisitor<NonGlobalTableMatcher, true>;
 class NonGlobalSubqueryMatcher
 {
 public:
-    struct Data
+    struct Data : public WithContext
     {
+        using RenamedTables = std::vector<std::pair<ASTPtr, std::vector<ASTPtr>>>;
+
+        Data(ContextPtr context_, const CheckShardsAndTables & checker_, RenamedTables & renamed_tables_)
+        : WithContext(context_), checker(checker_), renamed_tables(renamed_tables_)
+        {
+        }
+
         const CheckShardsAndTables & checker;
-        const Context & context;
-        std::vector<std::pair<ASTPtr, std::vector<ASTPtr>>> & renamed_tables;
+        RenamedTables & renamed_tables;
     };
 
     static void visit(ASTPtr & node, Data & data)
@@ -161,7 +176,7 @@ private:
             }
             auto & subquery = node.arguments->children.at(1);
             std::vector<ASTPtr> renamed;
-            NonGlobalTableVisitor::Data table_data{data.checker, data.context, renamed, &node, nullptr};
+            NonGlobalTableVisitor::Data table_data(data.getContext(), data.checker, renamed, &node, nullptr);
             NonGlobalTableVisitor(table_data).visit(subquery);
             if (!renamed.empty())
                 data.renamed_tables.emplace_back(subquery, std::move(renamed));
@@ -179,7 +194,7 @@ private:
             if (auto & subquery = node.table_expression->as<ASTTableExpression>()->subquery)
             {
                 std::vector<ASTPtr> renamed;
-                NonGlobalTableVisitor::Data table_data{data.checker, data.context, renamed, nullptr, table_join};
+                NonGlobalTableVisitor::Data table_data(data.getContext(), data.checker, renamed, nullptr, table_join);
                 NonGlobalTableVisitor(table_data).visit(subquery);
                 if (!renamed.empty())
                     data.renamed_tables.emplace_back(subquery, std::move(renamed));
@@ -202,7 +217,7 @@ void InJoinSubqueriesPreprocessor::visit(ASTPtr & ast) const
     if (!query || !query->tables())
         return;
 
-    if (context.getSettingsRef().distributed_product_mode == DistributedProductMode::ALLOW)
+    if (getContext()->getSettingsRef().distributed_product_mode == DistributedProductMode::ALLOW)
         return;
 
     const auto & tables_in_select_query = query->tables()->as<ASTTablesInSelectQuery &>();
@@ -221,12 +236,12 @@ void InJoinSubqueriesPreprocessor::visit(ASTPtr & ast) const
 
     /// If not really distributed table, skip it.
     {
-        StoragePtr storage = tryGetTable(table_expression->database_and_table_name, context);
+        StoragePtr storage = tryGetTable(table_expression->database_and_table_name, getContext());
         if (!storage || !checker->hasAtLeastTwoShards(*storage))
             return;
     }
 
-    NonGlobalSubqueryVisitor::Data visitor_data{*checker, context, renamed_tables};
+    NonGlobalSubqueryVisitor::Data visitor_data{getContext(), *checker, renamed_tables};
     NonGlobalSubqueryVisitor(visitor_data).visit(ast);
 }
 
diff --git a/src/Interpreters/InJoinSubqueriesPreprocessor.h b/src/Interpreters/InJoinSubqueriesPreprocessor.h
index 4d46fabfd99..92a408e7ae3 100644
--- a/src/Interpreters/InJoinSubqueriesPreprocessor.h
+++ b/src/Interpreters/InJoinSubqueriesPreprocessor.h
@@ -1,19 +1,18 @@
 #pragma once
 
-#include <common/types.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
 #include <Storages/IStorage_fwd.h>
+#include <common/types.h>
 
-#include <string>
 #include <memory>
+#include <string>
 
 
 namespace DB
 {
 
 class ASTSelectQuery;
-class Context;
-
 
 /** Scheme of operation:
   *
@@ -32,7 +31,7 @@ class Context;
   * Do not recursively preprocess subqueries, as it will be done by calling code.
   */
 
-class InJoinSubqueriesPreprocessor
+class InJoinSubqueriesPreprocessor : WithContext
 {
 public:
     using SubqueryTables = std::vector<std::pair<ASTPtr, std::vector<ASTPtr>>>;  /// {subquery, renamed_tables}
@@ -47,17 +46,17 @@ public:
         virtual ~CheckShardsAndTables() {}
     };
 
-    InJoinSubqueriesPreprocessor(const Context & context_, SubqueryTables & renamed_tables_,
-                                 CheckShardsAndTables::Ptr _checker = std::make_unique<CheckShardsAndTables>())
-        : context(context_)
-        , renamed_tables(renamed_tables_)
-        , checker(std::move(_checker))
-    {}
+    InJoinSubqueriesPreprocessor(
+        ContextPtr context_,
+        SubqueryTables & renamed_tables_,
+        CheckShardsAndTables::Ptr _checker = std::make_unique<CheckShardsAndTables>())
+        : WithContext(context_), renamed_tables(renamed_tables_), checker(std::move(_checker))
+    {
+    }
 
     void visit(ASTPtr & ast) const;
 
 private:
-    const Context & context;
     SubqueryTables & renamed_tables;
     CheckShardsAndTables::Ptr checker;
 };
diff --git a/src/Interpreters/InterpreterAlterQuery.cpp b/src/Interpreters/InterpreterAlterQuery.cpp
index 4a8aef414e4..9553dc87c31 100644
--- a/src/Interpreters/InterpreterAlterQuery.cpp
+++ b/src/Interpreters/InterpreterAlterQuery.cpp
@@ -1,24 +1,27 @@
 #include <Interpreters/InterpreterAlterQuery.h>
-#include <Interpreters/executeDDLQueryOnCluster.h>
-#include <Interpreters/MutationsInterpreter.h>
+
+#include <Access/AccessRightsElement.h>
+#include <Databases/DatabaseFactory.h>
+#include <Databases/DatabaseReplicated.h>
+#include <Databases/IDatabase.h>
 #include <Interpreters/AddDefaultDatabaseVisitor.h>
 #include <Interpreters/Context.h>
+#include <Interpreters/MutationsInterpreter.h>
 #include <Interpreters/QueryLog.h>
+#include <Interpreters/executeDDLQueryOnCluster.h>
 #include <Parsers/ASTAlterQuery.h>
 #include <Parsers/ASTAssignment.h>
-#include <Storages/IStorage.h>
 #include <Storages/AlterCommands.h>
-#include <Storages/MutationCommands.h>
-#include <Storages/PartitionCommands.h>
+#include <Storages/IStorage.h>
 #include <Storages/LiveView/LiveViewCommands.h>
 #include <Storages/LiveView/StorageLiveView.h>
-#include <Access/AccessRightsElement.h>
+#include <Storages/MutationCommands.h>
+#include <Storages/PartitionCommands.h>
 #include <Common/typeid_cast.h>
+
 #include <boost/range/algorithm_ext/push_back.hpp>
+
 #include <algorithm>
-#include <Databases/IDatabase.h>
-#include <Databases/DatabaseReplicated.h>
-#include <Databases/DatabaseFactory.h>
 
 
 namespace DB
@@ -32,8 +35,7 @@ namespace ErrorCodes
 }
 
 
-InterpreterAlterQuery::InterpreterAlterQuery(const ASTPtr & query_ptr_, const Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterAlterQuery::InterpreterAlterQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -44,22 +46,23 @@ BlockIO InterpreterAlterQuery::execute()
 
 
     if (!alter.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccess());
 
-    context.checkAccess(getRequiredAccess());
-    auto table_id = context.resolveStorageID(alter, Context::ResolveOrdinary);
+    getContext()->checkAccess(getRequiredAccess());
+    auto table_id = getContext()->resolveStorageID(alter, Context::ResolveOrdinary);
     query_ptr->as<ASTAlterQuery &>().database = table_id.database_name;
 
     DatabasePtr database = DatabaseCatalog::instance().getDatabase(table_id.database_name);
-    if (typeid_cast<DatabaseReplicated *>(database.get()) && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+    if (typeid_cast<DatabaseReplicated *>(database.get())
+        && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
     {
         auto guard = DatabaseCatalog::instance().getDDLGuard(table_id.database_name, table_id.table_name);
         guard->releaseTableLock();
-        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
     }
 
-    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, context);
-    auto alter_lock = table->lockForAlter(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
+    auto alter_lock = table->lockForAlter(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
 
     /// Add default database to table identifiers that we can encounter in e.g. default expressions,
@@ -105,15 +108,15 @@ BlockIO InterpreterAlterQuery::execute()
 
     if (!mutation_commands.empty())
     {
-        table->checkMutationIsPossible(mutation_commands, context.getSettingsRef());
-        MutationsInterpreter(table, metadata_snapshot, mutation_commands, context, false).validate();
-        table->mutate(mutation_commands, context);
+        table->checkMutationIsPossible(mutation_commands, getContext()->getSettingsRef());
+        MutationsInterpreter(table, metadata_snapshot, mutation_commands, getContext(), false).validate();
+        table->mutate(mutation_commands, getContext());
     }
 
     if (!partition_commands.empty())
     {
-        table->checkAlterPartitionIsPossible(partition_commands, metadata_snapshot, context.getSettingsRef());
-        auto partition_commands_pipe = table->alterPartition(metadata_snapshot, partition_commands, context);
+        table->checkAlterPartitionIsPossible(partition_commands, metadata_snapshot, getContext()->getSettingsRef());
+        auto partition_commands_pipe = table->alterPartition(metadata_snapshot, partition_commands, getContext());
         if (!partition_commands_pipe.empty())
             res.pipeline.init(std::move(partition_commands_pipe));
     }
@@ -136,10 +139,10 @@ BlockIO InterpreterAlterQuery::execute()
     if (!alter_commands.empty())
     {
         StorageInMemoryMetadata metadata = table->getInMemoryMetadata();
-        alter_commands.validate(metadata, context);
+        alter_commands.validate(metadata, getContext());
         alter_commands.prepare(metadata);
-        table->checkAlterIsPossible(alter_commands, context);
-        table->alter(alter_commands, context, alter_lock);
+        table->checkAlterIsPossible(alter_commands, getContext());
+        table->alter(alter_commands, getContext(), alter_lock);
     }
 
     return res;
@@ -328,7 +331,7 @@ AccessRightsElements InterpreterAlterQuery::getRequiredAccessForCommand(const AS
     return required_access;
 }
 
-void InterpreterAlterQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context &) const
+void InterpreterAlterQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const
 {
     const auto & alter = ast->as<const ASTAlterQuery &>();
 
@@ -358,14 +361,14 @@ void InterpreterAlterQuery::extendQueryLogElemImpl(QueryLogElement & elem, const
 
             if (!command->from_table.empty())
             {
-                String database = command->from_database.empty() ? context.getCurrentDatabase() : command->from_database;
+                String database = command->from_database.empty() ? getContext()->getCurrentDatabase() : command->from_database;
                 elem.query_databases.insert(database);
                 elem.query_tables.insert(database + "." + command->from_table);
             }
 
             if (!command->to_table.empty())
             {
-                String database = command->to_database.empty() ? context.getCurrentDatabase() : command->to_database;
+                String database = command->to_database.empty() ? getContext()->getCurrentDatabase() : command->to_database;
                 elem.query_databases.insert(database);
                 elem.query_tables.insert(database + "." + command->to_table);
             }
diff --git a/src/Interpreters/InterpreterAlterQuery.h b/src/Interpreters/InterpreterAlterQuery.h
index 37084844f6c..ae9750b0b62 100644
--- a/src/Interpreters/InterpreterAlterQuery.h
+++ b/src/Interpreters/InterpreterAlterQuery.h
@@ -6,7 +6,7 @@
 
 namespace DB
 {
-class Context;
+
 class AccessRightsElements;
 class ASTAlterCommand;
 
@@ -14,23 +14,21 @@ class ASTAlterCommand;
 /** Allows you add or remove a column in the table.
   * It also allows you to manipulate the partitions of the MergeTree family tables.
   */
-class InterpreterAlterQuery : public IInterpreter
+class InterpreterAlterQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterAlterQuery(const ASTPtr & query_ptr_, const Context & context_);
+    InterpreterAlterQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
     static AccessRightsElements getRequiredAccessForCommand(const ASTAlterCommand & command, const String & database, const String & table);
 
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context & context) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr context) const override;
 
 private:
     AccessRightsElements getRequiredAccess() const;
 
     ASTPtr query_ptr;
-
-    const Context & context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterCheckQuery.cpp b/src/Interpreters/InterpreterCheckQuery.cpp
index b3cd807abe5..e8a4f884dd0 100644
--- a/src/Interpreters/InterpreterCheckQuery.cpp
+++ b/src/Interpreters/InterpreterCheckQuery.cpp
@@ -29,8 +29,7 @@ NamesAndTypes getBlockStructure()
 }
 
 
-InterpreterCheckQuery::InterpreterCheckQuery(const ASTPtr & query_ptr_, const Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterCheckQuery::InterpreterCheckQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -38,14 +37,14 @@ InterpreterCheckQuery::InterpreterCheckQuery(const ASTPtr & query_ptr_, const Co
 BlockIO InterpreterCheckQuery::execute()
 {
     const auto & check = query_ptr->as<ASTCheckQuery &>();
-    auto table_id = context.resolveStorageID(check, Context::ResolveOrdinary);
+    auto table_id = getContext()->resolveStorageID(check, Context::ResolveOrdinary);
 
-    context.checkAccess(AccessType::SHOW_TABLES, table_id);
-    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, context);
-    auto check_results = table->checkData(query_ptr, context);
+    getContext()->checkAccess(AccessType::SHOW_TABLES, table_id);
+    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
+    auto check_results = table->checkData(query_ptr, getContext());
 
     Block block;
-    if (context.getSettingsRef().check_query_single_value_result)
+    if (getContext()->getSettingsRef().check_query_single_value_result)
     {
         bool result = std::all_of(check_results.begin(), check_results.end(), [] (const CheckResult & res) { return res.success; });
         auto column = ColumnUInt8::create();
diff --git a/src/Interpreters/InterpreterCheckQuery.h b/src/Interpreters/InterpreterCheckQuery.h
index c667ca74c22..557faddfe9c 100644
--- a/src/Interpreters/InterpreterCheckQuery.h
+++ b/src/Interpreters/InterpreterCheckQuery.h
@@ -7,20 +7,17 @@
 namespace DB
 {
 
-class Context;
 class Cluster;
 
-class InterpreterCheckQuery : public IInterpreter
+class InterpreterCheckQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCheckQuery(const ASTPtr & query_ptr_, const Context & context_);
+    InterpreterCheckQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
 private:
     ASTPtr query_ptr;
-
-    const Context & context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterCreateQuery.cpp b/src/Interpreters/InterpreterCreateQuery.cpp
index 8cd93546ad0..5d58d19ffaa 100644
--- a/src/Interpreters/InterpreterCreateQuery.cpp
+++ b/src/Interpreters/InterpreterCreateQuery.cpp
@@ -90,8 +90,8 @@ namespace ErrorCodes
 
 namespace fs = std::filesystem;
 
-InterpreterCreateQuery::InterpreterCreateQuery(const ASTPtr & query_ptr_, Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterCreateQuery::InterpreterCreateQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+    : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -113,7 +113,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
 
     /// Will write file with database metadata, if needed.
     String database_name_escaped = escapeForFileName(database_name);
-    fs::path metadata_path = fs::canonical(context.getPath());
+    fs::path metadata_path = fs::canonical(getContext()->getPath());
     fs::path metadata_file_tmp_path = metadata_path / "metadata" / (database_name_escaped + ".sql.tmp");
     fs::path metadata_file_path = metadata_path / "metadata" / (database_name_escaped + ".sql");
 
@@ -122,7 +122,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         if (!fs::exists(metadata_file_path))
             throw Exception("Database engine must be specified for ATTACH DATABASE query", ErrorCodes::UNKNOWN_DATABASE_ENGINE);
         /// Short syntax: try read database definition from file
-        auto ast = DatabaseOnDisk::parseQueryFromMetadata(nullptr, context, metadata_file_path);
+        auto ast = DatabaseOnDisk::parseQueryFromMetadata(nullptr, getContext(), metadata_file_path);
         create = ast->as<ASTCreateQuery &>();
         if (!create.table.empty() || !create.storage)
             throw Exception(ErrorCodes::INCORRECT_QUERY, "Metadata file {} contains incorrect CREATE DATABASE query", metadata_file_path.string());
@@ -136,7 +136,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         /// When attaching old-style database during server startup, we must always use Ordinary engine
         if (create.attach)
             throw Exception("Database engine must be specified for ATTACH DATABASE query", ErrorCodes::UNKNOWN_DATABASE_ENGINE);
-        bool old_style_database = context.getSettingsRef().default_database_engine.value == DefaultDatabaseEngine::Ordinary;
+        bool old_style_database = getContext()->getSettingsRef().default_database_engine.value == DefaultDatabaseEngine::Ordinary;
         auto engine = std::make_shared<ASTFunction>();
         auto storage = std::make_shared<ASTStorage>();
         engine->name = old_style_database ? "Ordinary" : "Atomic";
@@ -174,7 +174,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
 
         if (create_from_user)
         {
-            const auto & default_engine = context.getSettingsRef().default_database_engine.value;
+            const auto & default_engine = getContext()->getSettingsRef().default_database_engine.value;
             if (create.uuid == UUIDHelpers::Nil && default_engine == DefaultDatabaseEngine::Atomic)
                 create.uuid = UUIDHelpers::generateV4();    /// Will enable Atomic engine for nested database
         }
@@ -194,7 +194,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
     }
     else
     {
-        bool is_on_cluster = context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
+        bool is_on_cluster = getContext()->getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
         if (create.uuid != UUIDHelpers::Nil && !is_on_cluster)
             throw Exception("Ordinary database engine does not support UUID", ErrorCodes::INCORRECT_QUERY);
 
@@ -203,19 +203,20 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         metadata_path = metadata_path / "metadata" / database_name_escaped;
     }
 
-    if (create.storage->engine->name == "MaterializeMySQL" && !context.getSettingsRef().allow_experimental_database_materialize_mysql && !internal)
+    if (create.storage->engine->name == "MaterializeMySQL" && !getContext()->getSettingsRef().allow_experimental_database_materialize_mysql
+        && !internal)
     {
         throw Exception("MaterializeMySQL is an experimental database engine. "
                         "Enable allow_experimental_database_materialize_mysql to use it.", ErrorCodes::UNKNOWN_DATABASE_ENGINE);
     }
 
-    if (create.storage->engine->name == "Replicated" && !context.getSettingsRef().allow_experimental_database_replicated && !internal)
+    if (create.storage->engine->name == "Replicated" && !getContext()->getSettingsRef().allow_experimental_database_replicated && !internal)
     {
         throw Exception("Replicated is an experimental database engine. "
                         "Enable allow_experimental_database_replicated to use it.", ErrorCodes::UNKNOWN_DATABASE_ENGINE);
     }
 
-    DatabasePtr database = DatabaseFactory::get(create, metadata_path / "", context);
+    DatabasePtr database = DatabaseFactory::get(create, metadata_path / "", getContext());
 
     if (create.uuid != UUIDHelpers::Nil)
         create.database = TABLE_WITH_UUID_NAME_PLACEHOLDER;
@@ -237,7 +238,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         writeString(statement, out);
 
         out.next();
-        if (context.getSettingsRef().fsync_metadata)
+        if (getContext()->getSettingsRef().fsync_metadata)
             out.sync();
         out.close();
     }
@@ -261,7 +262,7 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         }
 
         /// We use global context here, because storages lifetime is bigger than query context lifetime
-        database->loadStoredObjects(context.getGlobalContext(), has_force_restore_data_flag, create.attach && force_attach);
+        database->loadStoredObjects(getContext()->getGlobalContext(), has_force_restore_data_flag, create.attach && force_attach);
     }
     catch (...)
     {
@@ -361,7 +362,7 @@ ASTPtr InterpreterCreateQuery::formatConstraints(const ConstraintsDescription &
 }
 
 ColumnsDescription InterpreterCreateQuery::getColumnsDescription(
-    const ASTExpressionList & columns_ast, const Context & context, bool sanity_check_compression_codecs)
+    const ASTExpressionList & columns_ast, ContextPtr context_, bool sanity_check_compression_codecs)
 {
     /// First, deduce implicit types.
 
@@ -388,7 +389,8 @@ ColumnsDescription InterpreterCreateQuery::getColumnsDescription(
                 if (*col_decl.null_modifier)
                     column_type = makeNullable(column_type);
             }
-            else if (context.getSettingsRef().data_type_default_nullable)
+            /// XXX: context_ or context ?
+            else if (context_->getSettingsRef().data_type_default_nullable)
             {
                 column_type = makeNullable(column_type);
             }
@@ -431,7 +433,7 @@ ColumnsDescription InterpreterCreateQuery::getColumnsDescription(
     Block defaults_sample_block;
     /// set missing types and wrap default_expression's in a conversion-function if necessary
     if (!default_expr_list->children.empty())
-        defaults_sample_block = validateColumnsDefaultsAndGetSampleBlock(default_expr_list, column_names_and_types, context);
+        defaults_sample_block = validateColumnsDefaultsAndGetSampleBlock(default_expr_list, column_names_and_types, context_);
 
     ColumnsDescription res;
     auto name_type_it = column_names_and_types.begin();
@@ -476,7 +478,7 @@ ColumnsDescription InterpreterCreateQuery::getColumnsDescription(
         res.add(std::move(column));
     }
 
-    if (context.getSettingsRef().flatten_nested)
+    if (context_->getSettingsRef().flatten_nested)
         res.flattenNested();
 
     if (res.getAllPhysical().empty())
@@ -508,24 +510,24 @@ InterpreterCreateQuery::TableProperties InterpreterCreateQuery::setProperties(AS
 
         if (create.columns_list->columns)
         {
-            bool sanity_check_compression_codecs = !create.attach && !context.getSettingsRef().allow_suspicious_codecs;
-            properties.columns = getColumnsDescription(*create.columns_list->columns, context, sanity_check_compression_codecs);
+            bool sanity_check_compression_codecs = !create.attach && !getContext()->getSettingsRef().allow_suspicious_codecs;
+            properties.columns = getColumnsDescription(*create.columns_list->columns, getContext(), sanity_check_compression_codecs);
         }
 
         if (create.columns_list->indices)
             for (const auto & index : create.columns_list->indices->children)
                 properties.indices.push_back(
-                    IndexDescription::getIndexFromAST(index->clone(), properties.columns, context));
+                    IndexDescription::getIndexFromAST(index->clone(), properties.columns, getContext()));
 
         properties.constraints = getConstraintsDescription(create.columns_list->constraints);
     }
     else if (!create.as_table.empty())
     {
-        String as_database_name = context.resolveDatabase(create.as_database);
-        StoragePtr as_storage = DatabaseCatalog::instance().getTable({as_database_name, create.as_table}, context);
+        String as_database_name = getContext()->resolveDatabase(create.as_database);
+        StoragePtr as_storage = DatabaseCatalog::instance().getTable({as_database_name, create.as_table}, getContext());
 
         /// as_storage->getColumns() and setEngine(...) must be called under structure lock of other_table for CREATE ... AS other_table.
-        as_storage_lock = as_storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+        as_storage_lock = as_storage->lockForShare(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
         auto as_storage_metadata = as_storage->getInMemoryMetadataPtr();
         properties.columns = as_storage_metadata->getColumns();
 
@@ -538,14 +540,14 @@ InterpreterCreateQuery::TableProperties InterpreterCreateQuery::setProperties(AS
     }
     else if (create.select)
     {
-        Block as_select_sample = InterpreterSelectWithUnionQuery::getSampleBlock(create.select->clone(), context);
+        Block as_select_sample = InterpreterSelectWithUnionQuery::getSampleBlock(create.select->clone(), getContext());
         properties.columns = ColumnsDescription(as_select_sample.getNamesAndTypesList());
     }
     else if (create.as_table_function)
     {
         /// Table function without columns list.
-        auto table_function = TableFunctionFactory::instance().get(create.as_table_function, context);
-        properties.columns = table_function->getActualTableStructure(context);
+        auto table_function = TableFunctionFactory::instance().get(create.as_table_function, getContext());
+        properties.columns = table_function->getActualTableStructure(getContext());
         assert(!properties.columns.empty());
     }
     else
@@ -586,7 +588,7 @@ void InterpreterCreateQuery::validateTableStructure(const ASTCreateQuery & creat
             throw Exception("Column " + backQuoteIfNeed(column.name) + " already exists", ErrorCodes::DUPLICATE_COLUMN);
     }
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
 
     /// Check low cardinality types in creating table if it was not allowed in setting
     if (!create.attach && !settings.allow_suspicious_low_cardinality_types && !create.is_materialized_view)
@@ -681,10 +683,10 @@ void InterpreterCreateQuery::setEngine(ASTCreateQuery & create) const
     {
         /// NOTE Getting the structure from the table specified in the AS is done not atomically with the creation of the table.
 
-        String as_database_name = context.resolveDatabase(create.as_database);
+        String as_database_name = getContext()->resolveDatabase(create.as_database);
         String as_table_name = create.as_table;
 
-        ASTPtr as_create_ptr = DatabaseCatalog::instance().getDatabase(as_database_name)->getCreateTableQuery(as_table_name, context);
+        ASTPtr as_create_ptr = DatabaseCatalog::instance().getDatabase(as_database_name)->getCreateTableQuery(as_table_name, getContext());
         const auto & as_create = as_create_ptr->as<ASTCreateQuery &>();
 
         const String qualified_name = backQuoteIfNeed(as_database_name) + "." + backQuoteIfNeed(as_table_name);
@@ -731,7 +733,8 @@ void InterpreterCreateQuery::assertOrSetUUID(ASTCreateQuery & create, const Data
     const auto * kind = create.is_dictionary ? "Dictionary" : "Table";
     const auto * kind_upper = create.is_dictionary ? "DICTIONARY" : "TABLE";
 
-    if (database->getEngineName() == "Replicated" && context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY && !internal)
+    if (database->getEngineName() == "Replicated" && getContext()->getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY
+        && !internal)
     {
         if (create.uuid == UUIDHelpers::Nil)
             throw Exception("Table UUID is not specified in DDL log", ErrorCodes::LOGICAL_ERROR);
@@ -761,7 +764,7 @@ void InterpreterCreateQuery::assertOrSetUUID(ASTCreateQuery & create, const Data
     }
     else
     {
-        bool is_on_cluster = context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
+        bool is_on_cluster = getContext()->getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
         bool has_uuid = create.uuid != UUIDHelpers::Nil || create.to_inner_uuid != UUIDHelpers::Nil;
         if (has_uuid && !is_on_cluster)
             throw Exception(ErrorCodes::INCORRECT_QUERY,
@@ -782,19 +785,19 @@ void InterpreterCreateQuery::assertOrSetUUID(ASTCreateQuery & create, const Data
         UUID uuid_of_table_to_replace;
         if (create.create_or_replace)
         {
-            uuid_of_table_to_replace = context.tryResolveStorageID(StorageID(create.database, create.table)).uuid;
+            uuid_of_table_to_replace = getContext()->tryResolveStorageID(StorageID(create.database, create.table)).uuid;
             if (uuid_of_table_to_replace == UUIDHelpers::Nil)
             {
                 /// Convert to usual CREATE
                 create.replace_table = false;
-                assert(!database->isTableExist(create.table, context));
+                assert(!database->isTableExist(create.table, getContext()));
             }
             else
                 create.table = "_tmp_replace_" + toString(uuid_of_table_to_replace);
         }
         else
         {
-            uuid_of_table_to_replace = context.resolveStorageID(StorageID(create.database, create.table)).uuid;
+            uuid_of_table_to_replace = getContext()->resolveStorageID(StorageID(create.database, create.table)).uuid;
             if (uuid_of_table_to_replace == UUIDHelpers::Nil)
                 throw Exception(ErrorCodes::UNKNOWN_TABLE, "Table {}.{} doesn't exist",
                                 backQuoteIfNeed(create.database), backQuoteIfNeed(create.table));
@@ -811,7 +814,7 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
         throw Exception("Temporary tables cannot be inside a database. You should not specify a database for a temporary table.",
             ErrorCodes::BAD_DATABASE_FOR_TEMPORARY_TABLE);
 
-    String current_database = context.getCurrentDatabase();
+    String current_database = getContext()->getCurrentDatabase();
     auto database_name = create.database.empty() ? current_database : create.database;
 
     // If this is a stub ATTACH query, read the query definition from the database
@@ -821,18 +824,18 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
         if (database->getEngineName() == "Replicated")
         {
             auto guard = DatabaseCatalog::instance().getDDLGuard(database_name, create.table);
-            if (typeid_cast<DatabaseReplicated *>(database.get()) && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+            if (typeid_cast<DatabaseReplicated *>(database.get()) && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
             {
                 create.database = database_name;
                 guard->releaseTableLock();
-                return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+                return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
             }
         }
 
         bool if_not_exists = create.if_not_exists;
 
         // Table SQL definition is available even if the table is detached (even permanently)
-        auto query = database->getCreateTableQuery(create.table, context);
+        auto query = database->getCreateTableQuery(create.table, getContext());
         create = query->as<ASTCreateQuery &>(); // Copy the saved create query, but use ATTACH instead of CREATE
         if (create.is_dictionary)
             throw Exception(ErrorCodes::INCORRECT_QUERY,
@@ -847,10 +850,10 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
 
     if (create.attach_from_path)
     {
-        fs::path user_files = fs::path(context.getUserFilesPath()).lexically_normal();
-        fs::path root_path = fs::path(context.getPath()).lexically_normal();
+        fs::path user_files = fs::path(getContext()->getUserFilesPath()).lexically_normal();
+        fs::path root_path = fs::path(getContext()->getPath()).lexically_normal();
 
-        if (context.getClientInfo().query_kind == ClientInfo::QueryKind::INITIAL_QUERY)
+        if (getContext()->getClientInfo().query_kind == ClientInfo::QueryKind::INITIAL_QUERY)
         {
             fs::path data_path = fs::path(*create.attach_from_path).lexically_normal();
             if (data_path.is_relative())
@@ -870,7 +873,7 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
                                 "Data directory {} must be inside {} to attach it", String(data_path), String(user_files));
         }
     }
-    else if (create.attach && !create.attach_short_syntax && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+    else if (create.attach && !create.attach_short_syntax && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
     {
         auto * log = &Poco::Logger::get("InterpreterCreateQuery");
         LOG_WARNING(log, "ATTACH TABLE query with full table definition is not recommended: "
@@ -902,11 +905,11 @@ BlockIO InterpreterCreateQuery::createTable(ASTCreateQuery & create)
     if (need_add_to_database && database->getEngineName() == "Replicated")
     {
         auto guard = DatabaseCatalog::instance().getDDLGuard(create.database, create.table);
-        if (typeid_cast<DatabaseReplicated *>(database.get()) && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+        if (typeid_cast<DatabaseReplicated *>(database.get()) && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
         {
             assertOrSetUUID(create, database);
             guard->releaseTableLock();
-            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
         }
     }
 
@@ -942,7 +945,7 @@ bool InterpreterCreateQuery::doCreateTable(ASTCreateQuery & create,
         assertOrSetUUID(create, database);
 
         /// Table can be created before or it can be created concurrently in another thread, while we were waiting in DDLGuard.
-        if (database->isTableExist(create.table, context))
+        if (database->isTableExist(create.table, getContext()))
         {
             /// TODO Check structure of table
             if (create.if_not_exists)
@@ -955,7 +958,7 @@ bool InterpreterCreateQuery::doCreateTable(ASTCreateQuery & create,
                 drop_ast->table = create.table;
                 drop_ast->no_ddl_lock = true;
 
-                Context drop_context = context;
+                auto drop_context = Context::createCopy(context);
                 InterpreterDropQuery interpreter(drop_ast, drop_context);
                 interpreter.execute();
             }
@@ -964,17 +967,17 @@ bool InterpreterCreateQuery::doCreateTable(ASTCreateQuery & create,
         }
 
         data_path = database->getTableDataPath(create);
-        if (!create.attach && !data_path.empty() && fs::exists(fs::path{context.getPath()} / data_path))
+        if (!create.attach && !data_path.empty() && fs::exists(fs::path{getContext()->getPath()} / data_path))
             throw Exception(ErrorCodes::TABLE_ALREADY_EXISTS, "Directory for table data {} already exists", String(data_path));
     }
     else
     {
-        if (create.if_not_exists && context.tryResolveStorageID({"", create.table}, Context::ResolveExternal))
+        if (create.if_not_exists && getContext()->tryResolveStorageID({"", create.table}, Context::ResolveExternal))
             return false;
 
         String temporary_table_name = create.table;
-        auto temporary_table = TemporaryTableHolder(context, properties.columns, properties.constraints, query_ptr);
-        context.getSessionContext().addExternalTable(temporary_table_name, std::move(temporary_table));
+        auto temporary_table = TemporaryTableHolder(getContext(), properties.columns, properties.constraints, query_ptr);
+        getContext()->getSessionContext()->addExternalTable(temporary_table_name, std::move(temporary_table));
         return true;
     }
 
@@ -995,16 +998,16 @@ bool InterpreterCreateQuery::doCreateTable(ASTCreateQuery & create,
     if (create.as_table_function)
     {
         const auto & factory = TableFunctionFactory::instance();
-        auto table_func = factory.get(create.as_table_function, context);
-        res = table_func->execute(create.as_table_function, context, create.table, properties.columns);
+        auto table_func = factory.get(create.as_table_function, getContext());
+        res = table_func->execute(create.as_table_function, getContext(), create.table, properties.columns);
         res->renameInMemory({create.database, create.table, create.uuid});
     }
     else
     {
         res = StorageFactory::instance().get(create,
             data_path,
-            context,
-            context.getGlobalContext(),
+            getContext(),
+            getContext()->getGlobalContext(),
             properties.columns,
             properties.constraints,
             false);
@@ -1015,7 +1018,7 @@ bool InterpreterCreateQuery::doCreateTable(ASTCreateQuery & create,
                         "ATTACH ... FROM ... query is not supported for {} table engine, "
                         "because such tables do not store any data on disk. Use CREATE instead.", res->getName());
 
-    database->createTable(context, create.table, res, query_ptr);
+    database->createTable(getContext(), create.table, res, query_ptr);
 
     /// Move table data to the proper place. Wo do not move data earlier to avoid situations
     /// when data directory moved, but table has not been created due to some error.
@@ -1067,10 +1070,10 @@ BlockIO InterpreterCreateQuery::doCreateOrReplaceTable(ASTCreateQuery & create,
         };
         ast_rename->elements.push_back(std::move(elem));
         ast_rename->exchange = true;
-        InterpreterRenameQuery(ast_rename, context).execute();
+        InterpreterRenameQuery(ast_rename, getContext()).execute();
         replaced = true;
 
-        InterpreterDropQuery(ast_drop, context).execute();
+        InterpreterDropQuery(ast_drop, getContext()).execute();
 
         create.table = table_to_replace_name;
         return fillTableIfNeeded(create);
@@ -1078,7 +1081,7 @@ BlockIO InterpreterCreateQuery::doCreateOrReplaceTable(ASTCreateQuery & create,
     catch (...)
     {
         if (created && create.replace_table && !replaced)
-            InterpreterDropQuery(ast_drop, context).execute();
+            InterpreterDropQuery(ast_drop, getContext()).execute();
         throw;
     }
 }
@@ -1093,12 +1096,12 @@ BlockIO InterpreterCreateQuery::fillTableIfNeeded(const ASTCreateQuery & create)
         insert->table_id = {create.database, create.table, create.uuid};
         insert->select = create.select->clone();
 
-        if (create.temporary && !context.getSessionContext().hasQueryContext())
-            context.getSessionContext().makeQueryContext();
+        if (create.temporary && !getContext()->getSessionContext()->hasQueryContext())
+            getContext()->getSessionContext()->makeQueryContext();
 
         return InterpreterInsertQuery(insert,
-            create.temporary ? context.getSessionContext() : context,
-            context.getSettingsRef().insert_allow_materialized_columns).execute();
+            create.temporary ? getContext()->getSessionContext() : getContext(),
+            getContext()->getSettingsRef().insert_allow_materialized_columns).execute();
     }
 
     return {};
@@ -1108,18 +1111,19 @@ BlockIO InterpreterCreateQuery::createDictionary(ASTCreateQuery & create)
 {
     String dictionary_name = create.table;
 
-    create.database = context.resolveDatabase(create.database);
+    create.database = getContext()->resolveDatabase(create.database);
     const String & database_name = create.database;
 
     auto guard = DatabaseCatalog::instance().getDDLGuard(database_name, dictionary_name);
     DatabasePtr database = DatabaseCatalog::instance().getDatabase(database_name);
 
-    if (typeid_cast<DatabaseReplicated *>(database.get()) && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+    if (typeid_cast<DatabaseReplicated *>(database.get())
+        && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
     {
         if (!create.attach)
             assertOrSetUUID(create, database);
         guard->releaseTableLock();
-        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
     }
 
     if (database->isDictionaryExist(dictionary_name))
@@ -1143,17 +1147,17 @@ BlockIO InterpreterCreateQuery::createDictionary(ASTCreateQuery & create)
 
     if (create.attach)
     {
-        auto config = getDictionaryConfigurationFromAST(create, context);
+        auto config = getDictionaryConfigurationFromAST(create, getContext());
         auto modification_time = database->getObjectMetadataModificationTime(dictionary_name);
         database->attachDictionary(dictionary_name, DictionaryAttachInfo{query_ptr, config, modification_time});
     }
     else
-        database->createDictionary(context, dictionary_name, query_ptr);
+        database->createDictionary(getContext(), dictionary_name, query_ptr);
 
     return {};
 }
 
-void InterpreterCreateQuery::prepareOnClusterQuery(ASTCreateQuery & create, const Context & context, const String & cluster_name)
+void InterpreterCreateQuery::prepareOnClusterQuery(ASTCreateQuery & create, ContextPtr local_context, const String & cluster_name)
 {
     if (create.attach)
         return;
@@ -1163,8 +1167,8 @@ void InterpreterCreateQuery::prepareOnClusterQuery(ASTCreateQuery & create, cons
     generateUUIDForTable(create);
 
     /// For cross-replication cluster we cannot use UUID in replica path.
-    String cluster_name_expanded = context.getMacros()->expand(cluster_name);
-    ClusterPtr cluster = context.getCluster(cluster_name_expanded);
+    String cluster_name_expanded = local_context->getMacros()->expand(cluster_name);
+    ClusterPtr cluster = local_context->getCluster(cluster_name_expanded);
 
     if (cluster->maybeCrossReplication())
     {
@@ -1188,7 +1192,7 @@ void InterpreterCreateQuery::prepareOnClusterQuery(ASTCreateQuery & create, cons
             Macros::MacroExpansionInfo info;
             info.table_id.uuid = create.uuid;
             info.ignore_unknown = true;
-            context.getMacros()->expand(zk_path, info);
+            local_context->getMacros()->expand(zk_path, info);
             if (!info.expanded_uuid)
                 return;
         }
@@ -1206,11 +1210,11 @@ BlockIO InterpreterCreateQuery::execute()
     auto & create = query_ptr->as<ASTCreateQuery &>();
     if (!create.cluster.empty())
     {
-        prepareOnClusterQuery(create, context, create.cluster);
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
+        prepareOnClusterQuery(create, getContext(), create.cluster);
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccess());
     }
 
-    context.checkAccess(getRequiredAccess());
+    getContext()->checkAccess(getRequiredAccess());
 
     ASTQueryWithOutput::resetOutputASTIfExist(create);
 
@@ -1274,12 +1278,12 @@ AccessRightsElements InterpreterCreateQuery::getRequiredAccess() const
     return required_access;
 }
 
-void InterpreterCreateQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context &) const
+void InterpreterCreateQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr) const
 {
     elem.query_kind = "Create";
     if (!as_table_saved.empty())
     {
-        String database = backQuoteIfNeed(as_database_saved.empty() ? context.getCurrentDatabase() : as_database_saved);
+        String database = backQuoteIfNeed(as_database_saved.empty() ? getContext()->getCurrentDatabase() : as_database_saved);
         elem.query_databases.insert(database);
         elem.query_tables.insert(database + "." + backQuoteIfNeed(as_table_saved));
     }
diff --git a/src/Interpreters/InterpreterCreateQuery.h b/src/Interpreters/InterpreterCreateQuery.h
index d88357fe412..30db7dbdc8e 100644
--- a/src/Interpreters/InterpreterCreateQuery.h
+++ b/src/Interpreters/InterpreterCreateQuery.h
@@ -1,18 +1,17 @@
 #pragma once
 
+#include <Access/AccessRightsElement.h>
 #include <Interpreters/IInterpreter.h>
 #include <Storages/ColumnsDescription.h>
+#include <Storages/ConstraintsDescription.h>
 #include <Storages/IStorage_fwd.h>
 #include <Storages/StorageInMemoryMetadata.h>
-#include <Storages/ConstraintsDescription.h>
 #include <Common/ThreadPool.h>
-#include <Access/AccessRightsElement.h>
 
 
 namespace DB
 {
 
-class Context;
 class ASTCreateQuery;
 class ASTExpressionList;
 class ASTConstraintDeclaration;
@@ -23,10 +22,10 @@ using DatabasePtr = std::shared_ptr<IDatabase>;
 /** Allows to create new table or database,
   *  or create an object for existing table or database.
   */
-class InterpreterCreateQuery : public IInterpreter
+class InterpreterCreateQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterCreateQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
@@ -54,12 +53,12 @@ public:
 
     /// Obtain information about columns, their types, default values and column comments,
     ///  for case when columns in CREATE query is specified explicitly.
-    static ColumnsDescription getColumnsDescription(const ASTExpressionList & columns, const Context & context, bool sanity_check_compression_codecs);
+    static ColumnsDescription getColumnsDescription(const ASTExpressionList & columns, ContextPtr context, bool sanity_check_compression_codecs);
     static ConstraintsDescription getConstraintsDescription(const ASTExpressionList * constraints);
 
-    static void prepareOnClusterQuery(ASTCreateQuery & create, const Context & context, const String & cluster_name);
+    static void prepareOnClusterQuery(ASTCreateQuery & create, ContextPtr context, const String & cluster_name);
 
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const override;
 
 private:
     struct TableProperties
@@ -88,7 +87,6 @@ private:
     void assertOrSetUUID(ASTCreateQuery & create, const DatabasePtr & database) const;
 
     ASTPtr query_ptr;
-    Context & context;
 
     /// Skip safety threshold when loading tables.
     bool has_force_restore_data_flag = false;
diff --git a/src/Interpreters/InterpreterCreateQuotaQuery.cpp b/src/Interpreters/InterpreterCreateQuotaQuery.cpp
index 4c35aaf573b..223215624b3 100644
--- a/src/Interpreters/InterpreterCreateQuotaQuery.cpp
+++ b/src/Interpreters/InterpreterCreateQuotaQuery.cpp
@@ -73,18 +73,18 @@ namespace
 BlockIO InterpreterCreateQuotaQuery::execute()
 {
     auto & query = query_ptr->as<ASTCreateQuotaQuery &>();
-    auto & access_control = context.getAccessControlManager();
-    context.checkAccess(query.alter ? AccessType::ALTER_QUOTA : AccessType::CREATE_QUOTA);
+    auto & access_control = getContext()->getAccessControlManager();
+    getContext()->checkAccess(query.alter ? AccessType::ALTER_QUOTA : AccessType::CREATE_QUOTA);
 
     if (!query.cluster.empty())
     {
-        query.replaceCurrentUserTag(context.getUserName());
-        return executeDDLQueryOnCluster(query_ptr, context);
+        query.replaceCurrentUserTag(getContext()->getUserName());
+        return executeDDLQueryOnCluster(query_ptr, getContext());
     }
 
     std::optional<RolesOrUsersSet> roles_from_query;
     if (query.roles)
-        roles_from_query = RolesOrUsersSet{*query.roles, access_control, context.getUserID()};
+        roles_from_query = RolesOrUsersSet{*query.roles, access_control, getContext()->getUserID()};
 
     if (query.alter)
     {
diff --git a/src/Interpreters/InterpreterCreateQuotaQuery.h b/src/Interpreters/InterpreterCreateQuotaQuery.h
index ca0e7b44713..d8edd24b2d9 100644
--- a/src/Interpreters/InterpreterCreateQuotaQuery.h
+++ b/src/Interpreters/InterpreterCreateQuotaQuery.h
@@ -2,19 +2,18 @@
 
 #include <Interpreters/IInterpreter.h>
 #include <Parsers/IAST_fwd.h>
-#include <optional>
 
 
 namespace DB
 {
+
 class ASTCreateQuotaQuery;
 struct Quota;
 
-
-class InterpreterCreateQuotaQuery : public IInterpreter
+class InterpreterCreateQuotaQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateQuotaQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterCreateQuotaQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -25,6 +24,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterCreateRoleQuery.cpp b/src/Interpreters/InterpreterCreateRoleQuery.cpp
index 72ad3234b95..b9debc259be 100644
--- a/src/Interpreters/InterpreterCreateRoleQuery.cpp
+++ b/src/Interpreters/InterpreterCreateRoleQuery.cpp
@@ -34,14 +34,14 @@ namespace
 BlockIO InterpreterCreateRoleQuery::execute()
 {
     const auto & query = query_ptr->as<const ASTCreateRoleQuery &>();
-    auto & access_control = context.getAccessControlManager();
+    auto & access_control = getContext()->getAccessControlManager();
     if (query.alter)
-        context.checkAccess(AccessType::ALTER_ROLE);
+        getContext()->checkAccess(AccessType::ALTER_ROLE);
     else
-        context.checkAccess(AccessType::CREATE_ROLE);
+        getContext()->checkAccess(AccessType::CREATE_ROLE);
 
     if (!query.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context);
+        return executeDDLQueryOnCluster(query_ptr, getContext());
 
     std::optional<SettingsProfileElements> settings_from_query;
     if (query.settings)
diff --git a/src/Interpreters/InterpreterCreateRoleQuery.h b/src/Interpreters/InterpreterCreateRoleQuery.h
index 768fd6d1d6b..18b3f946837 100644
--- a/src/Interpreters/InterpreterCreateRoleQuery.h
+++ b/src/Interpreters/InterpreterCreateRoleQuery.h
@@ -6,14 +6,14 @@
 
 namespace DB
 {
+
 class ASTCreateRoleQuery;
 struct Role;
 
-
-class InterpreterCreateRoleQuery : public IInterpreter
+class InterpreterCreateRoleQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateRoleQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterCreateRoleQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -21,6 +21,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterCreateRowPolicyQuery.cpp b/src/Interpreters/InterpreterCreateRowPolicyQuery.cpp
index 0932f74cdc5..5e4b9b30e66 100644
--- a/src/Interpreters/InterpreterCreateRowPolicyQuery.cpp
+++ b/src/Interpreters/InterpreterCreateRowPolicyQuery.cpp
@@ -44,21 +44,21 @@ namespace
 BlockIO InterpreterCreateRowPolicyQuery::execute()
 {
     auto & query = query_ptr->as<ASTCreateRowPolicyQuery &>();
-    auto & access_control = context.getAccessControlManager();
-    context.checkAccess(query.alter ? AccessType::ALTER_ROW_POLICY : AccessType::CREATE_ROW_POLICY);
+    auto & access_control = getContext()->getAccessControlManager();
+    getContext()->checkAccess(query.alter ? AccessType::ALTER_ROW_POLICY : AccessType::CREATE_ROW_POLICY);
 
     if (!query.cluster.empty())
     {
-        query.replaceCurrentUserTag(context.getUserName());
-        return executeDDLQueryOnCluster(query_ptr, context);
+        query.replaceCurrentUserTag(getContext()->getUserName());
+        return executeDDLQueryOnCluster(query_ptr, getContext());
     }
 
     assert(query.names->cluster.empty());
     std::optional<RolesOrUsersSet> roles_from_query;
     if (query.roles)
-        roles_from_query = RolesOrUsersSet{*query.roles, access_control, context.getUserID()};
+        roles_from_query = RolesOrUsersSet{*query.roles, access_control, getContext()->getUserID()};
 
-    query.replaceEmptyDatabase(context.getCurrentDatabase());
+    query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
 
     if (query.alter)
     {
diff --git a/src/Interpreters/InterpreterCreateRowPolicyQuery.h b/src/Interpreters/InterpreterCreateRowPolicyQuery.h
index feb583310c0..10167bac669 100644
--- a/src/Interpreters/InterpreterCreateRowPolicyQuery.h
+++ b/src/Interpreters/InterpreterCreateRowPolicyQuery.h
@@ -2,19 +2,18 @@
 
 #include <Interpreters/IInterpreter.h>
 #include <Parsers/IAST_fwd.h>
-#include <optional>
 
 
 namespace DB
 {
+
 class ASTCreateRowPolicyQuery;
 struct RowPolicy;
 
-
-class InterpreterCreateRowPolicyQuery : public IInterpreter
+class InterpreterCreateRowPolicyQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateRowPolicyQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterCreateRowPolicyQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -22,6 +21,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterCreateSettingsProfileQuery.cpp b/src/Interpreters/InterpreterCreateSettingsProfileQuery.cpp
index 0931b48e723..fb5fb258b10 100644
--- a/src/Interpreters/InterpreterCreateSettingsProfileQuery.cpp
+++ b/src/Interpreters/InterpreterCreateSettingsProfileQuery.cpp
@@ -42,16 +42,16 @@ namespace
 BlockIO InterpreterCreateSettingsProfileQuery::execute()
 {
     auto & query = query_ptr->as<ASTCreateSettingsProfileQuery &>();
-    auto & access_control = context.getAccessControlManager();
+    auto & access_control = getContext()->getAccessControlManager();
     if (query.alter)
-        context.checkAccess(AccessType::ALTER_SETTINGS_PROFILE);
+        getContext()->checkAccess(AccessType::ALTER_SETTINGS_PROFILE);
     else
-        context.checkAccess(AccessType::CREATE_SETTINGS_PROFILE);
+        getContext()->checkAccess(AccessType::CREATE_SETTINGS_PROFILE);
 
     if (!query.cluster.empty())
     {
-        query.replaceCurrentUserTag(context.getUserName());
-        return executeDDLQueryOnCluster(query_ptr, context);
+        query.replaceCurrentUserTag(getContext()->getUserName());
+        return executeDDLQueryOnCluster(query_ptr, getContext());
     }
 
     std::optional<SettingsProfileElements> settings_from_query;
@@ -60,7 +60,7 @@ BlockIO InterpreterCreateSettingsProfileQuery::execute()
 
     std::optional<RolesOrUsersSet> roles_from_query;
     if (query.to_roles)
-        roles_from_query = RolesOrUsersSet{*query.to_roles, access_control, context.getUserID()};
+        roles_from_query = RolesOrUsersSet{*query.to_roles, access_control, getContext()->getUserID()};
 
     if (query.alter)
     {
diff --git a/src/Interpreters/InterpreterCreateSettingsProfileQuery.h b/src/Interpreters/InterpreterCreateSettingsProfileQuery.h
index fd420779cf4..9ef1f0354a9 100644
--- a/src/Interpreters/InterpreterCreateSettingsProfileQuery.h
+++ b/src/Interpreters/InterpreterCreateSettingsProfileQuery.h
@@ -6,14 +6,14 @@
 
 namespace DB
 {
+
 class ASTCreateSettingsProfileQuery;
 struct SettingsProfile;
 
-
-class InterpreterCreateSettingsProfileQuery : public IInterpreter
+class InterpreterCreateSettingsProfileQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateSettingsProfileQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterCreateSettingsProfileQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -21,6 +21,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterCreateUserQuery.cpp b/src/Interpreters/InterpreterCreateUserQuery.cpp
index 777cf7de297..7f4969ff9ef 100644
--- a/src/Interpreters/InterpreterCreateUserQuery.cpp
+++ b/src/Interpreters/InterpreterCreateUserQuery.cpp
@@ -75,8 +75,8 @@ namespace
 BlockIO InterpreterCreateUserQuery::execute()
 {
     const auto & query = query_ptr->as<const ASTCreateUserQuery &>();
-    auto & access_control = context.getAccessControlManager();
-    auto access = context.getAccess();
+    auto & access_control = getContext()->getAccessControlManager();
+    auto access = getContext()->getAccess();
     access->checkAccess(query.alter ? AccessType::ALTER_USER : AccessType::CREATE_USER);
 
     std::optional<RolesOrUsersSet> default_roles_from_query;
@@ -91,7 +91,7 @@ BlockIO InterpreterCreateUserQuery::execute()
     }
 
     if (!query.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context);
+        return executeDDLQueryOnCluster(query_ptr, getContext());
 
     std::optional<SettingsProfileElements> settings_from_query;
     if (query.settings)
diff --git a/src/Interpreters/InterpreterCreateUserQuery.h b/src/Interpreters/InterpreterCreateUserQuery.h
index e5b614b5cbb..e9f4e82e767 100644
--- a/src/Interpreters/InterpreterCreateUserQuery.h
+++ b/src/Interpreters/InterpreterCreateUserQuery.h
@@ -6,14 +6,14 @@
 
 namespace DB
 {
+
 class ASTCreateUserQuery;
 struct User;
 
-
-class InterpreterCreateUserQuery : public IInterpreter
+class InterpreterCreateUserQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterCreateUserQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterCreateUserQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -21,6 +21,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterDescribeQuery.cpp b/src/Interpreters/InterpreterDescribeQuery.cpp
index 27d8ac48bc8..705e52da72c 100644
--- a/src/Interpreters/InterpreterDescribeQuery.cpp
+++ b/src/Interpreters/InterpreterDescribeQuery.cpp
@@ -69,20 +69,20 @@ BlockInputStreamPtr InterpreterDescribeQuery::executeImpl()
     if (table_expression.subquery)
     {
         auto names_and_types = InterpreterSelectWithUnionQuery::getSampleBlock(
-            table_expression.subquery->children.at(0), context).getNamesAndTypesList();
+            table_expression.subquery->children.at(0), getContext()).getNamesAndTypesList();
         columns = ColumnsDescription(std::move(names_and_types));
     }
     else if (table_expression.table_function)
     {
-        TableFunctionPtr table_function_ptr = TableFunctionFactory::instance().get(table_expression.table_function, context);
-        columns = table_function_ptr->getActualTableStructure(context);
+        TableFunctionPtr table_function_ptr = TableFunctionFactory::instance().get(table_expression.table_function, getContext());
+        columns = table_function_ptr->getActualTableStructure(getContext());
     }
     else
     {
-        auto table_id = context.resolveStorageID(table_expression.database_and_table_name);
-        context.checkAccess(AccessType::SHOW_COLUMNS, table_id);
-        auto table = DatabaseCatalog::instance().getTable(table_id, context);
-        auto table_lock = table->lockForShare(context.getInitialQueryId(), context.getSettingsRef().lock_acquire_timeout);
+        auto table_id = getContext()->resolveStorageID(table_expression.database_and_table_name);
+        getContext()->checkAccess(AccessType::SHOW_COLUMNS, table_id);
+        auto table = DatabaseCatalog::instance().getTable(table_id, getContext());
+        auto table_lock = table->lockForShare(getContext()->getInitialQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
         auto metadata_snapshot = table->getInMemoryMetadataPtr();
         columns = metadata_snapshot->getColumns();
     }
diff --git a/src/Interpreters/InterpreterDescribeQuery.h b/src/Interpreters/InterpreterDescribeQuery.h
index 4fafe61f229..627d1ca0353 100644
--- a/src/Interpreters/InterpreterDescribeQuery.h
+++ b/src/Interpreters/InterpreterDescribeQuery.h
@@ -7,16 +7,12 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Return names, types and other information about columns in specified table.
   */
-class InterpreterDescribeQuery : public IInterpreter
+class InterpreterDescribeQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterDescribeQuery(const ASTPtr & query_ptr_, const Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterDescribeQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -24,7 +20,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    const Context & context;
 
     BlockInputStreamPtr executeImpl();
 };
diff --git a/src/Interpreters/InterpreterDropAccessEntityQuery.cpp b/src/Interpreters/InterpreterDropAccessEntityQuery.cpp
index e02c047e75d..a9b8db6d74e 100644
--- a/src/Interpreters/InterpreterDropAccessEntityQuery.cpp
+++ b/src/Interpreters/InterpreterDropAccessEntityQuery.cpp
@@ -25,13 +25,13 @@ using EntityType = IAccessEntity::Type;
 BlockIO InterpreterDropAccessEntityQuery::execute()
 {
     auto & query = query_ptr->as<ASTDropAccessEntityQuery &>();
-    auto & access_control = context.getAccessControlManager();
-    context.checkAccess(getRequiredAccess());
+    auto & access_control = getContext()->getAccessControlManager();
+    getContext()->checkAccess(getRequiredAccess());
 
     if (!query.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context);
+        return executeDDLQueryOnCluster(query_ptr, getContext());
 
-    query.replaceEmptyDatabase(context.getCurrentDatabase());
+    query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
 
     auto do_drop = [&](const Strings & names)
     {
diff --git a/src/Interpreters/InterpreterDropAccessEntityQuery.h b/src/Interpreters/InterpreterDropAccessEntityQuery.h
index 0db68a0ad78..7f0f6348610 100644
--- a/src/Interpreters/InterpreterDropAccessEntityQuery.h
+++ b/src/Interpreters/InterpreterDropAccessEntityQuery.h
@@ -6,12 +6,13 @@
 
 namespace DB
 {
+
 class AccessRightsElements;
 
-class InterpreterDropAccessEntityQuery : public IInterpreter
+class InterpreterDropAccessEntityQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterDropAccessEntityQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterDropAccessEntityQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -19,6 +20,6 @@ private:
     AccessRightsElements getRequiredAccess() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterDropQuery.cpp b/src/Interpreters/InterpreterDropQuery.cpp
index 276f61d244a..8ac6a0ae3a8 100644
--- a/src/Interpreters/InterpreterDropQuery.cpp
+++ b/src/Interpreters/InterpreterDropQuery.cpp
@@ -43,16 +43,18 @@ static DatabasePtr tryGetDatabase(const String & database_name, bool if_exists)
 }
 
 
-InterpreterDropQuery::InterpreterDropQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+InterpreterDropQuery::InterpreterDropQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_)
+{
+}
 
 
 BlockIO InterpreterDropQuery::execute()
 {
     auto & drop = query_ptr->as<ASTDropQuery &>();
     if (!drop.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccessForDDLOnCluster());
 
-    if (context.getSettingsRef().database_atomic_wait_for_drop_and_detach_synchronously)
+    if (getContext()->getSettingsRef().database_atomic_wait_for_drop_and_detach_synchronously)
         drop.no_delay = true;
 
     if (!drop.table.empty())
@@ -98,10 +100,10 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
     auto table_id = StorageID(query);
     if (query.temporary || table_id.database_name.empty())
     {
-        if (context.tryResolveStorageID(table_id, Context::ResolveExternal))
+        if (getContext()->tryResolveStorageID(table_id, Context::ResolveExternal))
             return executeToTemporaryTable(table_id.getTableName(), query.kind);
         else
-            query.database = table_id.database_name = context.getCurrentDatabase();
+            query.database = table_id.database_name = getContext()->getCurrentDatabase();
     }
 
     if (query.temporary)
@@ -115,8 +117,8 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
     auto ddl_guard = (!query.no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(table_id.database_name, table_id.table_name) : nullptr);
 
     /// If table was already dropped by anyone, an exception will be thrown
-    auto [database, table] = query.if_exists ? DatabaseCatalog::instance().tryGetDatabaseAndTable(table_id, context)
-                                             : DatabaseCatalog::instance().getDatabaseAndTable(table_id, context);
+    auto [database, table] = query.if_exists ? DatabaseCatalog::instance().tryGetDatabaseAndTable(table_id, getContext())
+                                             : DatabaseCatalog::instance().getDatabaseAndTable(table_id, getContext());
 
     if (database && table)
     {
@@ -129,36 +131,36 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
         /// Prevents recursive drop from drop database query. The original query must specify a table.
         bool is_drop_or_detach_database = query_ptr->as<ASTDropQuery>()->table.empty();
         bool is_replicated_ddl_query = typeid_cast<DatabaseReplicated *>(database.get()) &&
-                                       context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY &&
+                                       getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY &&
                                        !is_drop_or_detach_database;
         if (is_replicated_ddl_query)
         {
             if (query.kind == ASTDropQuery::Kind::Detach)
-                context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
+                getContext()->checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
             else if (query.kind == ASTDropQuery::Kind::Truncate)
-                context.checkAccess(AccessType::TRUNCATE, table_id);
+                getContext()->checkAccess(AccessType::TRUNCATE, table_id);
             else if (query.kind == ASTDropQuery::Kind::Drop)
-                context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
+                getContext()->checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
 
             ddl_guard->releaseTableLock();
             table.reset();
-            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query.clone(), context);
+            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query.clone(), getContext());
         }
 
         if (query.kind == ASTDropQuery::Kind::Detach)
         {
-            context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
+            getContext()->checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
             table->checkTableCanBeDetached();
             table->shutdown();
             TableExclusiveLockHolder table_lock;
 
             if (database->getUUID() == UUIDHelpers::Nil)
-                table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+                table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
 
             if (query.permanently)
             {
                 /// Drop table from memory, don't touch data, metadata file renamed and will be skipped during server restart
-                database->detachTablePermanently(context, table_id.table_name);
+                database->detachTablePermanently(getContext(), table_id.table_name);
             }
             else
             {
@@ -168,26 +170,26 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
         }
         else if (query.kind == ASTDropQuery::Kind::Truncate)
         {
-            context.checkAccess(AccessType::TRUNCATE, table_id);
+            getContext()->checkAccess(AccessType::TRUNCATE, table_id);
             table->checkTableCanBeDropped();
 
-            auto table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+            auto table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
             auto metadata_snapshot = table->getInMemoryMetadataPtr();
             /// Drop table data, don't touch metadata
-            table->truncate(query_ptr, metadata_snapshot, context, table_lock);
+            table->truncate(query_ptr, metadata_snapshot, getContext(), table_lock);
         }
         else if (query.kind == ASTDropQuery::Kind::Drop)
         {
-            context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
+            getContext()->checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
             table->checkTableCanBeDropped();
 
             table->shutdown();
 
             TableExclusiveLockHolder table_lock;
             if (database->getUUID() == UUIDHelpers::Nil)
-                table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+                table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
 
-            database->dropTable(context, table_id.table_name, query.no_delay);
+            database->dropTable(getContext(), table_id.table_name, query.no_delay);
         }
 
         db = database;
@@ -209,7 +211,7 @@ BlockIO InterpreterDropQuery::executeToDictionary(
     if (is_temporary)
         throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
 
-    String database_name = context.resolveDatabase(database_name_);
+    String database_name = getContext()->resolveDatabase(database_name_);
 
     auto ddl_guard = (!no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(database_name, dictionary_name) : nullptr);
     query_ptr->as<ASTDropQuery>()->database = database_name;
@@ -217,17 +219,17 @@ BlockIO InterpreterDropQuery::executeToDictionary(
 
     bool is_drop_or_detach_database = query_ptr->as<ASTDropQuery>()->table.empty();
     bool is_replicated_ddl_query = typeid_cast<DatabaseReplicated *>(database.get()) &&
-                                   context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY &&
+                                   getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY &&
                                    !is_drop_or_detach_database;
     if (is_replicated_ddl_query)
     {
         if (kind == ASTDropQuery::Kind::Detach)
             throw Exception(ErrorCodes::INCORRECT_QUERY, "DETACH DICTIONARY is not allowed for Replicated databases.");
 
-        context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
+        getContext()->checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
 
         ddl_guard->releaseTableLock();
-        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+        return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
     }
 
     if (!database || !database->isDictionaryExist(dictionary_name))
@@ -243,7 +245,7 @@ BlockIO InterpreterDropQuery::executeToDictionary(
     if (kind == ASTDropQuery::Kind::Detach)
     {
         /// Drop dictionary from memory, don't touch data and metadata
-        context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
+        getContext()->checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
         database->detachDictionary(dictionary_name);
     }
     else if (kind == ASTDropQuery::Kind::Truncate)
@@ -252,8 +254,8 @@ BlockIO InterpreterDropQuery::executeToDictionary(
     }
     else if (kind == ASTDropQuery::Kind::Drop)
     {
-        context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
-        database->removeDictionary(context, dictionary_name);
+        getContext()->checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
+        database->removeDictionary(getContext(), dictionary_name);
     }
     return {};
 }
@@ -264,23 +266,24 @@ BlockIO InterpreterDropQuery::executeToTemporaryTable(const String & table_name,
         throw Exception("Unable to detach temporary table.", ErrorCodes::SYNTAX_ERROR);
     else
     {
-        auto & context_handle = context.hasSessionContext() ? context.getSessionContext() : context;
-        auto resolved_id = context_handle.tryResolveStorageID(StorageID("", table_name), Context::ResolveExternal);
+        auto context_handle = getContext()->hasSessionContext() ? getContext()->getSessionContext() : getContext();
+        auto resolved_id = context_handle->tryResolveStorageID(StorageID("", table_name), Context::ResolveExternal);
         if (resolved_id)
         {
-            StoragePtr table = DatabaseCatalog::instance().getTable(resolved_id, context);
+            StoragePtr table = DatabaseCatalog::instance().getTable(resolved_id, getContext());
             if (kind == ASTDropQuery::Kind::Truncate)
             {
-                auto table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+                auto table_lock
+                    = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
                 /// Drop table data, don't touch metadata
                 auto metadata_snapshot = table->getInMemoryMetadataPtr();
-                table->truncate(query_ptr, metadata_snapshot, context, table_lock);
+                table->truncate(query_ptr, metadata_snapshot, getContext(), table_lock);
             }
             else if (kind == ASTDropQuery::Kind::Drop)
             {
-                context_handle.removeExternalTable(table_name);
+                context_handle->removeExternalTable(table_name);
                 table->shutdown();
-                auto table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+                auto table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
                 /// Delete table data
                 table->drop();
                 table->is_dropped = true;
@@ -334,7 +337,7 @@ BlockIO InterpreterDropQuery::executeToDatabaseImpl(const ASTDropQuery & query,
         else if (query.kind == ASTDropQuery::Kind::Detach || query.kind == ASTDropQuery::Kind::Drop)
         {
             bool drop = query.kind == ASTDropQuery::Kind::Drop;
-            context.checkAccess(AccessType::DROP_DATABASE, database_name);
+            getContext()->checkAccess(AccessType::DROP_DATABASE, database_name);
 
             if (query.kind == ASTDropQuery::Kind::Detach && query.permanently)
                 throw Exception("DETACH PERMANENTLY is not implemented for databases", ErrorCodes::NOT_IMPLEMENTED);
@@ -363,7 +366,7 @@ BlockIO InterpreterDropQuery::executeToDatabaseImpl(const ASTDropQuery & query,
                 query_for_table.database = database_name;
                 query_for_table.no_delay = query.no_delay;
 
-                for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next())
+                for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
                 {
                     DatabasePtr db;
                     UUID table_to_wait = UUIDHelpers::Nil;
@@ -421,7 +424,7 @@ AccessRightsElements InterpreterDropQuery::getRequiredAccessForDDLOnCluster() co
     return required_access;
 }
 
-void InterpreterDropQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context &) const
+void InterpreterDropQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr) const
 {
     elem.query_kind = "Drop";
 }
diff --git a/src/Interpreters/InterpreterDropQuery.h b/src/Interpreters/InterpreterDropQuery.h
index 4a67857767f..8e8d577deec 100644
--- a/src/Interpreters/InterpreterDropQuery.h
+++ b/src/Interpreters/InterpreterDropQuery.h
@@ -16,20 +16,19 @@ class AccessRightsElements;
   * or remove information about table (just forget) from server (DETACH),
   * or just clear all data in table (TRUNCATE).
   */
-class InterpreterDropQuery : public IInterpreter
+class InterpreterDropQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterDropQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterDropQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     /// Drop table or database.
     BlockIO execute() override;
 
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr) const override;
 
 private:
     AccessRightsElements getRequiredAccessForDDLOnCluster() const;
     ASTPtr query_ptr;
-    Context & context;
 
     BlockIO executeToDatabase(const ASTDropQuery & query);
     BlockIO executeToDatabaseImpl(const ASTDropQuery & query, DatabasePtr & database, std::vector<UUID> & uuids_to_wait);
diff --git a/src/Interpreters/InterpreterExistsQuery.cpp b/src/Interpreters/InterpreterExistsQuery.cpp
index 335ee452e39..cbdb8561920 100644
--- a/src/Interpreters/InterpreterExistsQuery.cpp
+++ b/src/Interpreters/InterpreterExistsQuery.cpp
@@ -44,34 +44,34 @@ BlockInputStreamPtr InterpreterExistsQuery::executeImpl()
     {
         if (exists_query->temporary)
         {
-            result = context.tryResolveStorageID({"", exists_query->table}, Context::ResolveExternal);
+            result = getContext()->tryResolveStorageID({"", exists_query->table}, Context::ResolveExternal);
         }
         else
         {
-            String database = context.resolveDatabase(exists_query->database);
-            context.checkAccess(AccessType::SHOW_TABLES, database, exists_query->table);
-            result = DatabaseCatalog::instance().isTableExist({database, exists_query->table}, context);
+            String database = getContext()->resolveDatabase(exists_query->database);
+            getContext()->checkAccess(AccessType::SHOW_TABLES, database, exists_query->table);
+            result = DatabaseCatalog::instance().isTableExist({database, exists_query->table}, getContext());
         }
     }
     else if ((exists_query = query_ptr->as<ASTExistsViewQuery>()))
     {
-        String database = context.resolveDatabase(exists_query->database);
-        context.checkAccess(AccessType::SHOW_TABLES, database, exists_query->table);
-        auto table = DatabaseCatalog::instance().tryGetTable({database, exists_query->table}, context);
+        String database = getContext()->resolveDatabase(exists_query->database);
+        getContext()->checkAccess(AccessType::SHOW_TABLES, database, exists_query->table);
+        auto table = DatabaseCatalog::instance().tryGetTable({database, exists_query->table}, getContext());
         result = table && table->isView();
     }
     else if ((exists_query = query_ptr->as<ASTExistsDatabaseQuery>()))
     {
-        String database = context.resolveDatabase(exists_query->database);
-        context.checkAccess(AccessType::SHOW_DATABASES, database);
+        String database = getContext()->resolveDatabase(exists_query->database);
+        getContext()->checkAccess(AccessType::SHOW_DATABASES, database);
         result = DatabaseCatalog::instance().isDatabaseExist(database);
     }
     else if ((exists_query = query_ptr->as<ASTExistsDictionaryQuery>()))
     {
         if (exists_query->temporary)
             throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
-        String database = context.resolveDatabase(exists_query->database);
-        context.checkAccess(AccessType::SHOW_DICTIONARIES, database, exists_query->table);
+        String database = getContext()->resolveDatabase(exists_query->database);
+        getContext()->checkAccess(AccessType::SHOW_DICTIONARIES, database, exists_query->table);
         result = DatabaseCatalog::instance().isDictionaryExist({database, exists_query->table});
     }
 
diff --git a/src/Interpreters/InterpreterExistsQuery.h b/src/Interpreters/InterpreterExistsQuery.h
index 1860e1d0aa9..efc664f07c3 100644
--- a/src/Interpreters/InterpreterExistsQuery.h
+++ b/src/Interpreters/InterpreterExistsQuery.h
@@ -7,16 +7,12 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Check that table exists. Return single row with single column "result" of type UInt8 and value 0 or 1.
   */
-class InterpreterExistsQuery : public IInterpreter
+class InterpreterExistsQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterExistsQuery(const ASTPtr & query_ptr_, const Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterExistsQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) { }
 
     BlockIO execute() override;
 
@@ -24,7 +20,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    const Context & context;
 
     BlockInputStreamPtr executeImpl();
 };
diff --git a/src/Interpreters/InterpreterExplainQuery.cpp b/src/Interpreters/InterpreterExplainQuery.cpp
index 4eff8b8456d..a0195ec85e6 100644
--- a/src/Interpreters/InterpreterExplainQuery.cpp
+++ b/src/Interpreters/InterpreterExplainQuery.cpp
@@ -33,9 +33,9 @@ namespace
 {
     struct ExplainAnalyzedSyntaxMatcher
     {
-        struct Data
+        struct Data : public WithContext
         {
-            const Context & context;
+            explicit Data(ContextPtr context_) : WithContext(context_) {}
         };
 
         static bool needChildVisit(ASTPtr & node, ASTPtr &)
@@ -52,7 +52,7 @@ namespace
         static void visit(ASTSelectQuery & select, ASTPtr & node, Data & data)
         {
             InterpreterSelectQuery interpreter(
-                node, data.context, SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify());
+                node, data.getContext(), SelectQueryOptions(QueryProcessingStage::FetchColumns).analyze().modify());
 
             const SelectQueryInfo & query_info = interpreter.getQueryInfo();
             if (query_info.view_query)
@@ -236,7 +236,7 @@ BlockInputStreamPtr InterpreterExplainQuery::executeImpl()
         if (ast.getSettings())
             throw Exception("Settings are not supported for EXPLAIN SYNTAX query.", ErrorCodes::UNKNOWN_SETTING);
 
-        ExplainAnalyzedSyntaxVisitor::Data data{.context = context};
+        ExplainAnalyzedSyntaxVisitor::Data data(getContext());
         ExplainAnalyzedSyntaxVisitor(data).visit(query);
 
         ast.getExplainedQuery()->format(IAST::FormatSettings(buf, false));
@@ -249,11 +249,11 @@ BlockInputStreamPtr InterpreterExplainQuery::executeImpl()
         auto settings = checkAndGetSettings<QueryPlanSettings>(ast.getSettings());
         QueryPlan plan;
 
-        InterpreterSelectWithUnionQuery interpreter(ast.getExplainedQuery(), context, SelectQueryOptions());
+        InterpreterSelectWithUnionQuery interpreter(ast.getExplainedQuery(), getContext(), SelectQueryOptions());
         interpreter.buildQueryPlan(plan);
 
         if (settings.optimize)
-            plan.optimize(QueryPlanOptimizationSettings::fromContext(context));
+            plan.optimize(QueryPlanOptimizationSettings::fromContext(getContext()));
 
         plan.explainPlan(buf, settings.query_plan_options);
     }
@@ -265,11 +265,11 @@ BlockInputStreamPtr InterpreterExplainQuery::executeImpl()
         auto settings = checkAndGetSettings<QueryPipelineSettings>(ast.getSettings());
         QueryPlan plan;
 
-        InterpreterSelectWithUnionQuery interpreter(ast.getExplainedQuery(), context, SelectQueryOptions());
+        InterpreterSelectWithUnionQuery interpreter(ast.getExplainedQuery(), getContext(), SelectQueryOptions());
         interpreter.buildQueryPlan(plan);
         auto pipeline = plan.buildQueryPipeline(
-            QueryPlanOptimizationSettings::fromContext(context),
-            BuildQueryPipelineSettings::fromContext(context));
+            QueryPlanOptimizationSettings::fromContext(getContext()),
+            BuildQueryPipelineSettings::fromContext(getContext()));
 
         if (settings.graph)
         {
diff --git a/src/Interpreters/InterpreterExplainQuery.h b/src/Interpreters/InterpreterExplainQuery.h
index fbc8a998f2c..f16b1a8f69d 100644
--- a/src/Interpreters/InterpreterExplainQuery.h
+++ b/src/Interpreters/InterpreterExplainQuery.h
@@ -7,15 +7,11 @@
 namespace DB
 {
 
-class Context;
-
 /// Returns single row with explain results
-class InterpreterExplainQuery : public IInterpreter
+class InterpreterExplainQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterExplainQuery(const ASTPtr & query_, const Context & context_)
-        : query(query_), context(context_)
-    {}
+    InterpreterExplainQuery(const ASTPtr & query_, ContextPtr context_) : WithContext(context_), query(query_) { }
 
     BlockIO execute() override;
 
@@ -23,7 +19,6 @@ public:
 
 private:
     ASTPtr query;
-    const Context & context;
 
     BlockInputStreamPtr executeImpl();
 };
diff --git a/src/Interpreters/InterpreterExternalDDLQuery.cpp b/src/Interpreters/InterpreterExternalDDLQuery.cpp
index 4a93c0fa753..8f9f0cf9ddb 100644
--- a/src/Interpreters/InterpreterExternalDDLQuery.cpp
+++ b/src/Interpreters/InterpreterExternalDDLQuery.cpp
@@ -26,8 +26,8 @@ namespace ErrorCodes
     extern const int BAD_ARGUMENTS;
 }
 
-InterpreterExternalDDLQuery::InterpreterExternalDDLQuery(const ASTPtr & query_, Context & context_)
-    : query(query_), context(context_)
+InterpreterExternalDDLQuery::InterpreterExternalDDLQuery(const ASTPtr & query_, ContextPtr context_)
+    : WithContext(context_), query(query_)
 {
 }
 
@@ -35,7 +35,7 @@ BlockIO InterpreterExternalDDLQuery::execute()
 {
     const ASTExternalDDLQuery & external_ddl_query = query->as<ASTExternalDDLQuery &>();
 
-    if (context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+    if (getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
         throw Exception("Cannot parse and execute EXTERNAL DDL FROM.", ErrorCodes::SYNTAX_ERROR);
 
     if (external_ddl_query.from->name == "MySQL")
@@ -48,19 +48,19 @@ BlockIO InterpreterExternalDDLQuery::execute()
 
         if (external_ddl_query.external_ddl->as<ASTDropQuery>())
             return MySQLInterpreter::InterpreterMySQLDropQuery(
-                external_ddl_query.external_ddl, context, getIdentifierName(arguments[0]),
+                external_ddl_query.external_ddl, getContext(), getIdentifierName(arguments[0]),
                 getIdentifierName(arguments[1])).execute();
         else if (external_ddl_query.external_ddl->as<ASTRenameQuery>())
             return MySQLInterpreter::InterpreterMySQLRenameQuery(
-                external_ddl_query.external_ddl, context, getIdentifierName(arguments[0]),
+                external_ddl_query.external_ddl, getContext(), getIdentifierName(arguments[0]),
                 getIdentifierName(arguments[1])).execute();
         else if (external_ddl_query.external_ddl->as<MySQLParser::ASTAlterQuery>())
             return MySQLInterpreter::InterpreterMySQLAlterQuery(
-                external_ddl_query.external_ddl, context, getIdentifierName(arguments[0]),
+                external_ddl_query.external_ddl, getContext(), getIdentifierName(arguments[0]),
                 getIdentifierName(arguments[1])).execute();
         else if (external_ddl_query.external_ddl->as<MySQLParser::ASTCreateQuery>())
             return MySQLInterpreter::InterpreterMySQLCreateQuery(
-                external_ddl_query.external_ddl, context, getIdentifierName(arguments[0]),
+                external_ddl_query.external_ddl, getContext(), getIdentifierName(arguments[0]),
                 getIdentifierName(arguments[1])).execute();
 #endif
     }
diff --git a/src/Interpreters/InterpreterExternalDDLQuery.h b/src/Interpreters/InterpreterExternalDDLQuery.h
index f6b29c20c70..15a842a2611 100644
--- a/src/Interpreters/InterpreterExternalDDLQuery.h
+++ b/src/Interpreters/InterpreterExternalDDLQuery.h
@@ -6,15 +6,15 @@
 namespace DB
 {
 
-class InterpreterExternalDDLQuery : public IInterpreter
+class InterpreterExternalDDLQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterExternalDDLQuery(const ASTPtr & query_, Context & context_);
+    InterpreterExternalDDLQuery(const ASTPtr & query_, ContextPtr context_);
 
     BlockIO execute() override;
+
 private:
     const ASTPtr query;
-    Context & context;
 
 };
 
diff --git a/src/Interpreters/InterpreterFactory.cpp b/src/Interpreters/InterpreterFactory.cpp
index 15e4c52f040..4af8b6ffa7d 100644
--- a/src/Interpreters/InterpreterFactory.cpp
+++ b/src/Interpreters/InterpreterFactory.cpp
@@ -92,7 +92,7 @@ namespace ErrorCodes
 }
 
 
-std::unique_ptr<IInterpreter> InterpreterFactory::get(ASTPtr & query, Context & context, const SelectQueryOptions & options)
+std::unique_ptr<IInterpreter> InterpreterFactory::get(ASTPtr & query, ContextPtr context, const SelectQueryOptions & options)
 {
     OpenTelemetrySpanHolder span("InterpreterFactory::get()");
 
@@ -112,7 +112,7 @@ std::unique_ptr<IInterpreter> InterpreterFactory::get(ASTPtr & query, Context &
     else if (query->as<ASTInsertQuery>())
     {
         ProfileEvents::increment(ProfileEvents::InsertQuery);
-        bool allow_materialized = static_cast<bool>(context.getSettingsRef().insert_allow_materialized_columns);
+        bool allow_materialized = static_cast<bool>(context->getSettingsRef().insert_allow_materialized_columns);
         return std::make_unique<InterpreterInsertQuery>(query, context, allow_materialized);
     }
     else if (query->as<ASTCreateQuery>())
diff --git a/src/Interpreters/InterpreterFactory.h b/src/Interpreters/InterpreterFactory.h
index 22a6ab7e8f3..c122fe11b7d 100644
--- a/src/Interpreters/InterpreterFactory.h
+++ b/src/Interpreters/InterpreterFactory.h
@@ -16,7 +16,7 @@ class InterpreterFactory
 public:
     static std::unique_ptr<IInterpreter> get(
         ASTPtr & query,
-        Context & context,
+        ContextPtr context,
         const SelectQueryOptions & options = {});
 };
 
diff --git a/src/Interpreters/InterpreterGrantQuery.cpp b/src/Interpreters/InterpreterGrantQuery.cpp
index b518178f6d0..7487ca79bde 100644
--- a/src/Interpreters/InterpreterGrantQuery.cpp
+++ b/src/Interpreters/InterpreterGrantQuery.cpp
@@ -225,7 +225,7 @@ BlockIO InterpreterGrantQuery::execute()
 {
     auto & query = query_ptr->as<ASTGrantQuery &>();
 
-    query.replaceCurrentUserTag(context.getUserName());
+    query.replaceCurrentUserTag(getContext()->getUserName());
     query.access_rights_elements.eraseNonGrantable();
 
     if (!query.access_rights_elements.sameOptions())
@@ -233,32 +233,32 @@ BlockIO InterpreterGrantQuery::execute()
     if (!query.access_rights_elements.empty() && query.access_rights_elements[0].is_partial_revoke && !query.is_revoke)
         throw Exception("A partial revoke should be revoked, not granted", ErrorCodes::LOGICAL_ERROR);
 
-    auto & access_control = context.getAccessControlManager();
+    auto & access_control = getContext()->getAccessControlManager();
     std::optional<RolesOrUsersSet> roles_set;
     if (query.roles)
         roles_set = RolesOrUsersSet{*query.roles, access_control};
 
-    std::vector<UUID> grantees = RolesOrUsersSet{*query.grantees, access_control, context.getUserID()}.getMatchingIDs(access_control);
+    std::vector<UUID> grantees = RolesOrUsersSet{*query.grantees, access_control, getContext()->getUserID()}.getMatchingIDs(access_control);
 
     /// Check if the current user has corresponding roles granted with admin option.
     std::vector<UUID> roles;
     if (roles_set)
-        roles = getRoleIDsAndCheckAdminOption(access_control, *context.getAccess(), query, *roles_set, grantees);
+        roles = getRoleIDsAndCheckAdminOption(access_control, *getContext()->getAccess(), query, *roles_set, grantees);
 
     if (!query.cluster.empty())
     {
         /// To execute the command GRANT the current user needs to have the access granted with GRANT OPTION.
         auto required_access = query.access_rights_elements;
         std::for_each(required_access.begin(), required_access.end(), [&](AccessRightsElement & element) { element.grant_option = true; });
-        checkGranteesAreAllowed(access_control, *context.getAccess(), grantees);
-        return executeDDLQueryOnCluster(query_ptr, context, std::move(required_access));
+        checkGranteesAreAllowed(access_control, *getContext()->getAccess(), grantees);
+        return executeDDLQueryOnCluster(query_ptr, getContext(), std::move(required_access));
     }
 
-    query.replaceEmptyDatabase(context.getCurrentDatabase());
+    query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
 
     /// Check if the current user has corresponding access rights with grant option.
     if (!query.access_rights_elements.empty())
-        checkGrantOption(access_control, *context.getAccess(), query, grantees);
+        checkGrantOption(access_control, *getContext()->getAccess(), query, grantees);
 
     /// Update roles and users listed in `grantees`.
     auto update_func = [&](const AccessEntityPtr & entity) -> AccessEntityPtr
@@ -291,7 +291,7 @@ void InterpreterGrantQuery::updateRoleFromQuery(Role & role, const ASTGrantQuery
     updateFromQueryImpl(role, query, roles_to_grant_or_revoke);
 }
 
-void InterpreterGrantQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, const Context &) const
+void InterpreterGrantQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, ContextPtr) const
 {
     auto & query = query_ptr->as<ASTGrantQuery &>();
     if (query.is_revoke)
diff --git a/src/Interpreters/InterpreterGrantQuery.h b/src/Interpreters/InterpreterGrantQuery.h
index 645b33346c3..f5939ff3cb7 100644
--- a/src/Interpreters/InterpreterGrantQuery.h
+++ b/src/Interpreters/InterpreterGrantQuery.h
@@ -1,30 +1,30 @@
 #pragma once
 
+#include <Core/UUID.h>
 #include <Interpreters/IInterpreter.h>
 #include <Parsers/IAST_fwd.h>
-#include <Core/UUID.h>
 
 
 namespace DB
 {
+
 class ASTGrantQuery;
 struct User;
 struct Role;
 
-
-class InterpreterGrantQuery : public IInterpreter
+class InterpreterGrantQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterGrantQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterGrantQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
     static void updateUserFromQuery(User & user, const ASTGrantQuery & query);
     static void updateRoleFromQuery(Role & role, const ASTGrantQuery & query);
-    void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, ContextPtr) const override;
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterInsertQuery.cpp b/src/Interpreters/InterpreterInsertQuery.cpp
index 933a5bc6c77..33cfe4bf7a2 100644
--- a/src/Interpreters/InterpreterInsertQuery.cpp
+++ b/src/Interpreters/InterpreterInsertQuery.cpp
@@ -44,9 +44,9 @@ namespace ErrorCodes
 }
 
 InterpreterInsertQuery::InterpreterInsertQuery(
-    const ASTPtr & query_ptr_, const Context & context_, bool allow_materialized_, bool no_squash_, bool no_destination_)
-    : query_ptr(query_ptr_)
-    , context(context_)
+    const ASTPtr & query_ptr_, ContextPtr context_, bool allow_materialized_, bool no_squash_, bool no_destination_)
+    : WithContext(context_)
+    , query_ptr(query_ptr_)
     , allow_materialized(allow_materialized_)
     , no_squash(no_squash_)
     , no_destination(no_destination_)
@@ -60,12 +60,12 @@ StoragePtr InterpreterInsertQuery::getTable(ASTInsertQuery & query)
     if (query.table_function)
     {
         const auto & factory = TableFunctionFactory::instance();
-        TableFunctionPtr table_function_ptr = factory.get(query.table_function, context);
-        return table_function_ptr->execute(query.table_function, context, table_function_ptr->getName());
+        TableFunctionPtr table_function_ptr = factory.get(query.table_function, getContext());
+        return table_function_ptr->execute(query.table_function, getContext(), table_function_ptr->getName());
     }
 
-    query.table_id = context.resolveStorageID(query.table_id);
-    return DatabaseCatalog::instance().getTable(query.table_id, context);
+    query.table_id = getContext()->resolveStorageID(query.table_id);
+    return DatabaseCatalog::instance().getTable(query.table_id, getContext());
 }
 
 Block InterpreterInsertQuery::getSampleBlock(
@@ -85,7 +85,7 @@ Block InterpreterInsertQuery::getSampleBlock(
 
     Block table_sample = metadata_snapshot->getSampleBlock();
 
-    const auto columns_ast = processColumnTransformers(context.getCurrentDatabase(), table, metadata_snapshot, query.columns);
+    const auto columns_ast = processColumnTransformers(getContext()->getCurrentDatabase(), table, metadata_snapshot, query.columns);
 
     /// Form the block based on the column names from the query
     Block res;
@@ -150,25 +150,25 @@ static bool isTrivialSelect(const ASTPtr & select)
 
 BlockIO InterpreterInsertQuery::execute()
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
     auto & query = query_ptr->as<ASTInsertQuery &>();
 
     BlockIO res;
 
     StoragePtr table = getTable(query);
-    auto table_lock = table->lockForShare(context.getInitialQueryId(), settings.lock_acquire_timeout);
+    auto table_lock = table->lockForShare(getContext()->getInitialQueryId(), settings.lock_acquire_timeout);
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
 
     auto query_sample_block = getSampleBlock(query, table, metadata_snapshot);
     if (!query.table_function)
-        context.checkAccess(AccessType::INSERT, query.table_id, query_sample_block.getNames());
+        getContext()->checkAccess(AccessType::INSERT, query.table_id, query_sample_block.getNames());
 
     bool is_distributed_insert_select = false;
 
     if (query.select && table->isRemote() && settings.parallel_distributed_insert_select)
     {
         // Distributed INSERT SELECT
-        if (auto maybe_pipeline = table->distributedWrite(query, context))
+        if (auto maybe_pipeline = table->distributedWrite(query, getContext()))
         {
             res.pipeline = std::move(*maybe_pipeline);
             is_distributed_insert_select = true;
@@ -206,15 +206,15 @@ BlockIO InterpreterInsertQuery::execute()
                   * to avoid unnecessary squashing.
                   */
 
-                Settings new_settings = context.getSettings();
+                Settings new_settings = getContext()->getSettings();
 
                 new_settings.max_threads = std::max<UInt64>(1, settings.max_insert_threads);
 
                 if (settings.min_insert_block_size_rows && table->prefersLargeBlocks())
                     new_settings.max_block_size = settings.min_insert_block_size_rows;
 
-                Context new_context = context;
-                new_context.setSettings(new_settings);
+                auto new_context = Context::createCopy(context);
+                new_context->setSettings(new_settings);
 
                 InterpreterSelectWithUnionQuery interpreter_select{
                     query.select, new_context, SelectQueryOptions(QueryProcessingStage::Complete, 1)};
@@ -224,7 +224,7 @@ BlockIO InterpreterInsertQuery::execute()
             {
                 /// Passing 1 as subquery_depth will disable limiting size of intermediate result.
                 InterpreterSelectWithUnionQuery interpreter_select{
-                    query.select, context, SelectQueryOptions(QueryProcessingStage::Complete, 1)};
+                    query.select, getContext(), SelectQueryOptions(QueryProcessingStage::Complete, 1)};
                 res = interpreter_select.execute();
             }
 
@@ -235,7 +235,7 @@ BlockIO InterpreterInsertQuery::execute()
         }
         else if (query.watch)
         {
-            InterpreterWatchQuery interpreter_watch{ query.watch, context };
+            InterpreterWatchQuery interpreter_watch{ query.watch, getContext() };
             res = interpreter_watch.execute();
             res.pipeline.init(Pipe(std::make_shared<SourceFromInputStream>(std::move(res.in))));
         }
@@ -248,21 +248,21 @@ BlockIO InterpreterInsertQuery::execute()
             /// NOTE: we explicitly ignore bound materialized views when inserting into Kafka Storage.
             ///       Otherwise we'll get duplicates when MV reads same rows again from Kafka.
             if (table->noPushingToViews() && !no_destination)
-                out = table->write(query_ptr, metadata_snapshot, context);
+                out = table->write(query_ptr, metadata_snapshot, getContext());
             else
-                out = std::make_shared<PushingToViewsBlockOutputStream>(table, metadata_snapshot, context, query_ptr, no_destination);
+                out = std::make_shared<PushingToViewsBlockOutputStream>(table, metadata_snapshot, getContext(), query_ptr, no_destination);
 
             /// Note that we wrap transforms one on top of another, so we write them in reverse of data processing order.
 
             /// Checking constraints. It must be done after calculation of all defaults, so we can check them on calculated columns.
             if (const auto & constraints = metadata_snapshot->getConstraints(); !constraints.empty())
                 out = std::make_shared<CheckConstraintsBlockOutputStream>(
-                    query.table_id, out, out->getHeader(), metadata_snapshot->getConstraints(), context);
+                    query.table_id, out, out->getHeader(), metadata_snapshot->getConstraints(), getContext());
 
             /// Actually we don't know structure of input blocks from query/table,
             /// because some clients break insertion protocol (columns != header)
             out = std::make_shared<AddingDefaultBlockOutputStream>(
-                out, query_sample_block, metadata_snapshot->getColumns(), context);
+                out, query_sample_block, metadata_snapshot->getColumns(), getContext());
 
             /// It's important to squash blocks as early as possible (before other transforms),
             ///  because other transforms may work inefficient if block size is small.
@@ -281,7 +281,7 @@ BlockIO InterpreterInsertQuery::execute()
             }
 
             auto out_wrapper = std::make_shared<CountingBlockOutputStream>(out);
-            out_wrapper->setProcessListElement(context.getProcessListElement());
+            out_wrapper->setProcessListElement(getContext()->getProcessListElement());
             out = std::move(out_wrapper);
             out_streams.emplace_back(std::move(out));
         }
@@ -299,7 +299,7 @@ BlockIO InterpreterInsertQuery::execute()
                 res.pipeline.getHeader().getColumnsWithTypeAndName(),
                 header.getColumnsWithTypeAndName(),
                 ActionsDAG::MatchColumnsMode::Position);
-        auto actions = std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(context));
+        auto actions = std::make_shared<ExpressionActions>(actions_dag, ExpressionActionsSettings::fromContext(getContext()));
 
         res.pipeline.addSimpleTransform([&](const Block & in_header) -> ProcessorPtr
         {
@@ -327,7 +327,7 @@ BlockIO InterpreterInsertQuery::execute()
     else if (query.data && !query.has_tail) /// can execute without additional data
     {
         // res.out = std::move(out_streams.at(0));
-        res.in = std::make_shared<InputStreamFromASTInsertQuery>(query_ptr, nullptr, query_sample_block, context, nullptr);
+        res.in = std::make_shared<InputStreamFromASTInsertQuery>(query_ptr, nullptr, query_sample_block, getContext(), nullptr);
         res.in = std::make_shared<NullAndDoCopyBlockInputStream>(res.in, out_streams.at(0));
     }
     else
@@ -350,10 +350,10 @@ StorageID InterpreterInsertQuery::getDatabaseTable() const
 }
 
 
-void InterpreterInsertQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, const Context & context_) const
+void InterpreterInsertQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr &, ContextPtr context_) const
 {
     elem.query_kind = "Insert";
-    const auto & insert_table = context_.getInsertionTable();
+    const auto & insert_table = context_->getInsertionTable();
     if (!insert_table.empty())
     {
         elem.query_databases.insert(insert_table.getDatabaseName());
diff --git a/src/Interpreters/InterpreterInsertQuery.h b/src/Interpreters/InterpreterInsertQuery.h
index 85178bc73ad..71b8c827702 100644
--- a/src/Interpreters/InterpreterInsertQuery.h
+++ b/src/Interpreters/InterpreterInsertQuery.h
@@ -9,17 +9,14 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Interprets the INSERT query.
   */
-class InterpreterInsertQuery : public IInterpreter
+class InterpreterInsertQuery : public IInterpreter, WithContext
 {
 public:
     InterpreterInsertQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         bool allow_materialized_ = false,
         bool no_squash_ = false,
         bool no_destination_ = false);
@@ -33,14 +30,13 @@ public:
 
     StorageID getDatabaseTable() const;
 
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context & context_) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr context_) const override;
 
 private:
     StoragePtr getTable(ASTInsertQuery & query);
     Block getSampleBlock(const ASTInsertQuery & query, const StoragePtr & table, const StorageMetadataPtr & metadata_snapshot) const;
 
     ASTPtr query_ptr;
-    const Context & context;
     const bool allow_materialized;
     const bool no_squash;
     const bool no_destination;
diff --git a/src/Interpreters/InterpreterKillQueryQuery.cpp b/src/Interpreters/InterpreterKillQueryQuery.cpp
index c50659c6c45..88ddfefef63 100644
--- a/src/Interpreters/InterpreterKillQueryQuery.cpp
+++ b/src/Interpreters/InterpreterKillQueryQuery.cpp
@@ -74,7 +74,7 @@ static void insertResultRow(size_t n, CancellationCode code, const Block & sourc
         columns[col_num]->insertFrom(*source.getByName(header.getByPosition(col_num).name).column, n);
 }
 
-static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & processes_block, Context & context)
+static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & processes_block, ContextPtr context)
 {
     QueryDescriptors res;
     size_t num_processes = processes_block.rows();
@@ -82,7 +82,7 @@ static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & proce
 
     const ColumnString & query_id_col = typeid_cast<const ColumnString &>(*processes_block.getByName("query_id").column);
     const ColumnString & user_col = typeid_cast<const ColumnString &>(*processes_block.getByName("user").column);
-    const ClientInfo & my_client = context.getProcessListElement()->getClientInfo();
+    const ClientInfo & my_client = context->getProcessListElement()->getClientInfo();
 
     bool access_denied = false;
     std::optional<bool> is_kill_query_granted_value;
@@ -90,7 +90,7 @@ static QueryDescriptors extractQueriesExceptMeAndCheckAccess(const Block & proce
     {
         if (!is_kill_query_granted_value)
         {
-            is_kill_query_granted_value = context.getAccess()->isGranted(AccessType::KILL_QUERY);
+            is_kill_query_granted_value = context->getAccess()->isGranted(AccessType::KILL_QUERY);
             if (!*is_kill_query_granted_value)
                 access_denied = true;
         }
@@ -195,7 +195,7 @@ BlockIO InterpreterKillQueryQuery::execute()
     const auto & query = query_ptr->as<ASTKillQueryQuery &>();
 
     if (!query.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccessForDDLOnCluster());
 
     BlockIO res_io;
     switch (query.type)
@@ -206,8 +206,8 @@ BlockIO InterpreterKillQueryQuery::execute()
         if (!processes_block)
             return res_io;
 
-        ProcessList & process_list = context.getProcessList();
-        QueryDescriptors queries_to_stop = extractQueriesExceptMeAndCheckAccess(processes_block, context);
+        ProcessList & process_list = getContext()->getProcessList();
+        QueryDescriptors queries_to_stop = extractQueriesExceptMeAndCheckAccess(processes_block, getContext());
 
         auto header = processes_block.cloneEmpty();
         header.insert(0, {ColumnString::create(), std::make_shared<DataTypeString>(), "kill_status"});
@@ -248,7 +248,7 @@ BlockIO InterpreterKillQueryQuery::execute()
         MutableColumns res_columns = header.cloneEmptyColumns();
         auto table_id = StorageID::createEmpty();
         AccessRightsElements required_access_rights;
-        auto access = context.getAccess();
+        auto access = getContext()->getAccess();
         bool access_denied = false;
 
         for (size_t i = 0; i < mutations_block.rows(); ++i)
@@ -259,14 +259,16 @@ BlockIO InterpreterKillQueryQuery::execute()
             CancellationCode code = CancellationCode::Unknown;
             if (!query.test)
             {
-                auto storage = DatabaseCatalog::instance().tryGetTable(table_id, context);
+                auto storage = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
                 if (!storage)
                     code = CancellationCode::NotFound;
                 else
                 {
                     ParserAlterCommand parser;
-                    auto command_ast = parseQuery(parser, command_col.getDataAt(i).toString(), 0, context.getSettingsRef().max_parser_depth);
-                    required_access_rights = InterpreterAlterQuery::getRequiredAccessForCommand(command_ast->as<const ASTAlterCommand &>(), table_id.database_name, table_id.table_name);
+                    auto command_ast
+                        = parseQuery(parser, command_col.getDataAt(i).toString(), 0, getContext()->getSettingsRef().max_parser_depth);
+                    required_access_rights = InterpreterAlterQuery::getRequiredAccessForCommand(
+                        command_ast->as<const ASTAlterCommand &>(), table_id.database_name, table_id.table_name);
                     if (!access->isGranted(required_access_rights))
                     {
                         access_denied = true;
@@ -300,7 +302,7 @@ Block InterpreterKillQueryQuery::getSelectResult(const String & columns, const S
     if (where_expression)
         select_query += " WHERE " + queryToString(where_expression);
 
-    auto stream = executeQuery(select_query, context.getGlobalContext(), true).getInputStream();
+    auto stream = executeQuery(select_query, getContext()->getGlobalContext(), true).getInputStream();
     Block res = stream->read();
 
     if (res && stream->read())
diff --git a/src/Interpreters/InterpreterKillQueryQuery.h b/src/Interpreters/InterpreterKillQueryQuery.h
index 788703f8e6d..5ffd9a525a2 100644
--- a/src/Interpreters/InterpreterKillQueryQuery.h
+++ b/src/Interpreters/InterpreterKillQueryQuery.h
@@ -8,15 +8,12 @@
 namespace DB
 {
 
-class Context;
 class AccessRightsElements;
 
-
-class InterpreterKillQueryQuery final : public IInterpreter
+class InterpreterKillQueryQuery final : public IInterpreter, WithContext
 {
 public:
-    InterpreterKillQueryQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterKillQueryQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) { }
 
     BlockIO execute() override;
 
@@ -25,8 +22,6 @@ private:
     Block getSelectResult(const String & columns, const String & table);
 
     ASTPtr query_ptr;
-    Context & context;
 };
 
-
 }
diff --git a/src/Interpreters/InterpreterOptimizeQuery.cpp b/src/Interpreters/InterpreterOptimizeQuery.cpp
index d8e9013e397..64de5ee0479 100644
--- a/src/Interpreters/InterpreterOptimizeQuery.cpp
+++ b/src/Interpreters/InterpreterOptimizeQuery.cpp
@@ -25,12 +25,12 @@ BlockIO InterpreterOptimizeQuery::execute()
     const auto & ast = query_ptr->as<ASTOptimizeQuery &>();
 
     if (!ast.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccess());
 
-    context.checkAccess(getRequiredAccess());
+    getContext()->checkAccess(getRequiredAccess());
 
-    auto table_id = context.resolveStorageID(ast, Context::ResolveOrdinary);
-    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, context);
+    auto table_id = getContext()->resolveStorageID(ast, Context::ResolveOrdinary);
+    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
 
     // Empty list of names means we deduplicate by all columns, but user can explicitly state which columns to use.
@@ -40,7 +40,8 @@ BlockIO InterpreterOptimizeQuery::execute()
         // User requested custom set of columns for deduplication, possibly with Column Transformer expression.
         {
             // Expand asterisk, column transformers, etc into list of column names.
-            const auto cols = processColumnTransformers(context.getCurrentDatabase(), table, metadata_snapshot, ast.deduplicate_by_columns);
+            const auto cols
+                = processColumnTransformers(getContext()->getCurrentDatabase(), table, metadata_snapshot, ast.deduplicate_by_columns);
             for (const auto & col : cols->children)
                 column_names.emplace_back(col->getColumnName());
         }
@@ -68,7 +69,7 @@ BlockIO InterpreterOptimizeQuery::execute()
         }
     }
 
-    table->optimize(query_ptr, metadata_snapshot, ast.partition, ast.final, ast.deduplicate, column_names, context);
+    table->optimize(query_ptr, metadata_snapshot, ast.partition, ast.final, ast.deduplicate, column_names, getContext());
 
     return {};
 }
diff --git a/src/Interpreters/InterpreterOptimizeQuery.h b/src/Interpreters/InterpreterOptimizeQuery.h
index faf336a0e98..8491fe8df49 100644
--- a/src/Interpreters/InterpreterOptimizeQuery.h
+++ b/src/Interpreters/InterpreterOptimizeQuery.h
@@ -6,19 +6,15 @@
 
 namespace DB
 {
-class Context;
-class AccessRightsElements;
 
+class AccessRightsElements;
 
 /** Just call method "optimize" for table.
   */
-class InterpreterOptimizeQuery : public IInterpreter
+class InterpreterOptimizeQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterOptimizeQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_)
-    {
-    }
+    InterpreterOptimizeQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -26,7 +22,6 @@ private:
     AccessRightsElements getRequiredAccess() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterRenameQuery.cpp b/src/Interpreters/InterpreterRenameQuery.cpp
index 923a342d9ea..515559ad903 100644
--- a/src/Interpreters/InterpreterRenameQuery.cpp
+++ b/src/Interpreters/InterpreterRenameQuery.cpp
@@ -18,8 +18,8 @@ namespace ErrorCodes
     extern const int NOT_IMPLEMENTED;
 }
 
-InterpreterRenameQuery::InterpreterRenameQuery(const ASTPtr & query_ptr_, Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterRenameQuery::InterpreterRenameQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+    : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -29,12 +29,12 @@ BlockIO InterpreterRenameQuery::execute()
     const auto & rename = query_ptr->as<const ASTRenameQuery &>();
 
     if (!rename.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccess());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccess());
 
-    context.checkAccess(getRequiredAccess());
+    getContext()->checkAccess(getRequiredAccess());
 
-    String path = context.getPath();
-    String current_database = context.getCurrentDatabase();
+    String path = getContext()->getPath();
+    String current_database = getContext()->getCurrentDatabase();
 
     /** In case of error while renaming, it is possible that only part of tables was renamed
       *  or we will be in inconsistent state. (It is worth to be fixed.)
@@ -77,10 +77,11 @@ BlockIO InterpreterRenameQuery::executeToTables(const ASTRenameQuery & rename, c
     for (const auto & elem : descriptions)
     {
         if (!rename.exchange)
-            database_catalog.assertTableDoesntExist(StorageID(elem.to_database_name, elem.to_table_name), context);
+            database_catalog.assertTableDoesntExist(StorageID(elem.to_database_name, elem.to_table_name), getContext());
 
         DatabasePtr database = database_catalog.getDatabase(elem.from_database_name);
-        if (typeid_cast<DatabaseReplicated *>(database.get()) && context.getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
+        if (typeid_cast<DatabaseReplicated *>(database.get())
+            && getContext()->getClientInfo().query_kind != ClientInfo::QueryKind::SECONDARY_QUERY)
         {
             if (1 < descriptions.size())
                 throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Database {} is Replicated, "
@@ -90,12 +91,12 @@ BlockIO InterpreterRenameQuery::executeToTables(const ASTRenameQuery & rename, c
             UniqueTableName to(elem.to_database_name, elem.to_table_name);
             ddl_guards[from]->releaseTableLock();
             ddl_guards[to]->releaseTableLock();
-            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, context);
+            return typeid_cast<DatabaseReplicated *>(database.get())->tryEnqueueReplicatedDDL(query_ptr, getContext());
         }
         else
         {
             database->renameTable(
-                context,
+                getContext(),
                 elem.from_table_name,
                 *database_catalog.getDatabase(elem.to_database_name),
                 elem.to_table_name,
@@ -140,19 +141,19 @@ AccessRightsElements InterpreterRenameQuery::getRequiredAccess() const
     return required_access;
 }
 
-void InterpreterRenameQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context &) const
+void InterpreterRenameQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const
 {
     elem.query_kind = "Rename";
     const auto & rename = ast->as<const ASTRenameQuery &>();
     for (const auto & element : rename.elements)
     {
         {
-            String database = backQuoteIfNeed(element.from.database.empty() ? context.getCurrentDatabase() : element.from.database);
+            String database = backQuoteIfNeed(element.from.database.empty() ? getContext()->getCurrentDatabase() : element.from.database);
             elem.query_databases.insert(database);
             elem.query_tables.insert(database + "." + backQuoteIfNeed(element.from.table));
         }
         {
-            String database = backQuoteIfNeed(element.to.database.empty() ? context.getCurrentDatabase() : element.to.database);
+            String database = backQuoteIfNeed(element.to.database.empty() ? getContext()->getCurrentDatabase() : element.to.database);
             elem.query_databases.insert(database);
             elem.query_tables.insert(database + "." + backQuoteIfNeed(element.to.table));
         }
diff --git a/src/Interpreters/InterpreterRenameQuery.h b/src/Interpreters/InterpreterRenameQuery.h
index 0da25f63e8d..49fdd50f52d 100644
--- a/src/Interpreters/InterpreterRenameQuery.h
+++ b/src/Interpreters/InterpreterRenameQuery.h
@@ -7,7 +7,6 @@
 namespace DB
 {
 
-class Context;
 class AccessRightsElements;
 class DDLGuard;
 
@@ -49,12 +48,12 @@ using TableGuards = std::map<UniqueTableName, std::unique_ptr<DDLGuard>>;
 /** Rename one table
   *  or rename many tables at once.
   */
-class InterpreterRenameQuery : public IInterpreter
+class InterpreterRenameQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterRenameQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterRenameQuery(const ASTPtr & query_ptr_, ContextPtr context_);
     BlockIO execute() override;
-    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const override;
 
 private:
     BlockIO executeToTables(const ASTRenameQuery & rename, const RenameDescriptions & descriptions, TableGuards & ddl_guards);
@@ -63,7 +62,6 @@ private:
     AccessRightsElements getRequiredAccess() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterSelectQuery.cpp b/src/Interpreters/InterpreterSelectQuery.cpp
index bef45c920df..f44e55a3df9 100644
--- a/src/Interpreters/InterpreterSelectQuery.cpp
+++ b/src/Interpreters/InterpreterSelectQuery.cpp
@@ -137,8 +137,8 @@ String InterpreterSelectQuery::generateFilterActions(ActionsDAGPtr & actions, co
     table_expr->children.push_back(table_expr->database_and_table_name);
 
     /// Using separate expression analyzer to prevent any possible alias injection
-    auto syntax_result = TreeRewriter(*context).analyzeSelect(query_ast, TreeRewriterResult({}, storage, metadata_snapshot));
-    SelectQueryExpressionAnalyzer analyzer(query_ast, syntax_result, *context, metadata_snapshot);
+    auto syntax_result = TreeRewriter(context).analyzeSelect(query_ast, TreeRewriterResult({}, storage, metadata_snapshot));
+    SelectQueryExpressionAnalyzer analyzer(query_ast, syntax_result, context, metadata_snapshot);
     actions = analyzer.simpleSelectActions();
 
     auto column_name = expr_list->children.at(0)->getColumnName();
@@ -153,7 +153,7 @@ String InterpreterSelectQuery::generateFilterActions(ActionsDAGPtr & actions, co
 
 InterpreterSelectQuery::InterpreterSelectQuery(
     const ASTPtr & query_ptr_,
-    const Context & context_,
+    ContextPtr context_,
     const SelectQueryOptions & options_,
     const Names & required_result_column_names_)
     : InterpreterSelectQuery(query_ptr_, context_, nullptr, std::nullopt, nullptr, options_, required_result_column_names_)
@@ -162,7 +162,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
 
 InterpreterSelectQuery::InterpreterSelectQuery(
     const ASTPtr & query_ptr_,
-    const Context & context_,
+    ContextPtr context_,
     const BlockInputStreamPtr & input_,
     const SelectQueryOptions & options_)
     : InterpreterSelectQuery(query_ptr_, context_, input_, std::nullopt, nullptr, options_.copy().noSubquery())
@@ -170,7 +170,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
 
 InterpreterSelectQuery::InterpreterSelectQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         Pipe input_pipe_,
         const SelectQueryOptions & options_)
         : InterpreterSelectQuery(query_ptr_, context_, nullptr, std::move(input_pipe_), nullptr, options_.copy().noSubquery())
@@ -178,7 +178,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
 
 InterpreterSelectQuery::InterpreterSelectQuery(
     const ASTPtr & query_ptr_,
-    const Context & context_,
+    ContextPtr context_,
     const StoragePtr & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
     const SelectQueryOptions & options_)
@@ -191,15 +191,15 @@ InterpreterSelectQuery::~InterpreterSelectQuery() = default;
 /** There are no limits on the maximum size of the result for the subquery.
   *  Since the result of the query is not the result of the entire query.
   */
-static Context getSubqueryContext(const Context & context)
+static ContextPtr getSubqueryContext(ContextPtr context)
 {
-    Context subquery_context = context;
-    Settings subquery_settings = context.getSettings();
+    auto subquery_context = Context::createCopy(context);
+    Settings subquery_settings = context->getSettings();
     subquery_settings.max_result_rows = 0;
     subquery_settings.max_result_bytes = 0;
     /// The calculation of extremes does not make sense and is not necessary (if you do it, then the extremes of the subquery can be taken for whole query).
     subquery_settings.extremes = false;
-    subquery_context.setSettings(subquery_settings);
+    subquery_context->setSettings(subquery_settings);
     return subquery_context;
 }
 
@@ -222,7 +222,7 @@ static void rewriteMultipleJoins(ASTPtr & query, const TablesWithColumns & table
 
 /// Checks that the current user has the SELECT privilege.
 static void checkAccessRightsForSelect(
-    const Context & context,
+    ContextPtr context,
     const StorageID & table_id,
     const StorageMetadataPtr & table_metadata,
     const Strings & required_columns,
@@ -235,19 +235,19 @@ static void checkAccessRightsForSelect(
         /// In this case just checking access for `required_columns` doesn't work correctly
         /// because `required_columns` will contain the name of a column of minimum size (see TreeRewriterResult::collectUsedColumns())
         /// which is probably not the same column as the column the current user has access to.
-        auto access = context.getAccess();
+        auto access = context->getAccess();
         for (const auto & column : table_metadata->getColumns())
         {
             if (access->isGranted(AccessType::SELECT, table_id.database_name, table_id.table_name, column.name))
                 return;
         }
-        throw Exception(context.getUserName() + ": Not enough privileges. "
+        throw Exception(context->getUserName() + ": Not enough privileges. "
                         "To execute this query it's necessary to have grant SELECT for at least one column on " + table_id.getFullTableName(),
                         ErrorCodes::ACCESS_DENIED);
     }
 
     /// General check.
-    context.checkAccess(AccessType::SELECT, table_id, required_columns);
+    context->checkAccess(AccessType::SELECT, table_id, required_columns);
 }
 
 /// Returns true if we should ignore quotas and limits for a specified table in the system database.
@@ -264,7 +264,7 @@ static bool shouldIgnoreQuotaAndLimits(const StorageID & table_id)
 
 InterpreterSelectQuery::InterpreterSelectQuery(
     const ASTPtr & query_ptr_,
-    const Context & context_,
+    ContextPtr context_,
     const BlockInputStreamPtr & input_,
     std::optional<Pipe> input_pipe_,
     const StoragePtr & storage_,
@@ -308,7 +308,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
         ApplyWithSubqueryVisitor().visit(query_ptr);
     }
 
-    JoinedTables joined_tables(getSubqueryContext(*context), getSelectQuery());
+    JoinedTables joined_tables(getSubqueryContext(context), getSelectQuery());
 
     bool got_storage_from_query = false;
     if (!has_input && !storage)
@@ -375,7 +375,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
         if (view)
             view->replaceWithSubquery(getSelectQuery(), view_table, metadata_snapshot);
 
-        syntax_analyzer_result = TreeRewriter(*context).analyzeSelect(
+        syntax_analyzer_result = TreeRewriter(context).analyzeSelect(
             query_ptr,
             TreeRewriterResult(source_header.getNamesAndTypesList(), storage, metadata_snapshot),
             options, joined_tables.tablesWithColumns(), required_result_column_names, table_join);
@@ -383,7 +383,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
         /// Save scalar sub queries's results in the query context
         if (!options.only_analyze && context->hasQueryContext())
             for (const auto & it : syntax_analyzer_result->getScalars())
-                context->getQueryContext().addScalar(it.first, it.second);
+                context->getQueryContext()->addScalar(it.first, it.second);
 
         if (view)
         {
@@ -406,12 +406,18 @@ InterpreterSelectQuery::InterpreterSelectQuery(
                 current_info.query = query_ptr;
                 current_info.syntax_analyzer_result = syntax_analyzer_result;
 
-                MergeTreeWhereOptimizer{current_info, *context, std::move(column_compressed_sizes), metadata_snapshot, syntax_analyzer_result->requiredSourceColumns(), log};
+                MergeTreeWhereOptimizer{
+                    current_info,
+                    context,
+                    std::move(column_compressed_sizes),
+                    metadata_snapshot,
+                    syntax_analyzer_result->requiredSourceColumns(),
+                    log};
             }
         }
 
         query_analyzer = std::make_unique<SelectQueryExpressionAnalyzer>(
-                query_ptr, syntax_analyzer_result, *context, metadata_snapshot,
+                query_ptr, syntax_analyzer_result, context, metadata_snapshot,
                 NameSet(required_result_column_names.begin(), required_result_column_names.end()),
                 !options.only_analyze, options, std::move(subquery_for_sets));
 
@@ -519,7 +525,7 @@ InterpreterSelectQuery::InterpreterSelectQuery(
     {
         /// The current user should have the SELECT privilege.
         /// If this table_id is for a table function we don't check access rights here because in this case they have been already checked in ITableFunction::execute().
-        checkAccessRightsForSelect(*context, table_id, metadata_snapshot, required_columns, *syntax_analyzer_result);
+        checkAccessRightsForSelect(context, table_id, metadata_snapshot, required_columns, *syntax_analyzer_result);
 
         /// Remove limits for some tables in the `system` database.
         if (shouldIgnoreQuotaAndLimits(table_id) && (joined_tables.tablesCount() <= 1))
@@ -561,8 +567,8 @@ BlockIO InterpreterSelectQuery::execute()
     buildQueryPlan(query_plan);
 
     res.pipeline = std::move(*query_plan.buildQueryPipeline(
-        QueryPlanOptimizationSettings::fromContext(*context),
-        BuildQueryPipelineSettings::fromContext(*context)));
+        QueryPlanOptimizationSettings::fromContext(context),
+        BuildQueryPipelineSettings::fromContext(context)));
     return res;
 }
 
@@ -573,7 +579,7 @@ Block InterpreterSelectQuery::getSampleBlockImpl()
     query_info.query = query_ptr;
 
     if (storage && !options.only_analyze)
-        from_stage = storage->getQueryProcessingStage(*context, options.to_stage, query_info);
+        from_stage = storage->getQueryProcessingStage(context, options.to_stage, query_info);
 
     /// Do I need to perform the first part of the pipeline?
     /// Running on remote servers during distributed processing or if query is not distributed.
@@ -609,7 +615,7 @@ Block InterpreterSelectQuery::getSampleBlockImpl()
         {
             ExpressionActions(
                 analysis_result.prewhere_info->prewhere_actions,
-                ExpressionActionsSettings::fromContext(*context)).execute(header);
+                ExpressionActionsSettings::fromContext(context)).execute(header);
             if (analysis_result.prewhere_info->remove_prewhere_column)
                 header.erase(analysis_result.prewhere_info->prewhere_column_name);
         }
@@ -655,7 +661,7 @@ Block InterpreterSelectQuery::getSampleBlockImpl()
     return analysis_result.final_projection->getResultColumns();
 }
 
-static Field getWithFillFieldValue(const ASTPtr & node, const Context & context)
+static Field getWithFillFieldValue(const ASTPtr & node, ContextPtr context)
 {
     const auto & [field, type] = evaluateConstantExpression(node, context);
 
@@ -665,7 +671,7 @@ static Field getWithFillFieldValue(const ASTPtr & node, const Context & context)
     return field;
 }
 
-static FillColumnDescription getWithFillDescription(const ASTOrderByElement & order_by_elem, const Context & context)
+static FillColumnDescription getWithFillDescription(const ASTOrderByElement & order_by_elem, ContextPtr context)
 {
     FillColumnDescription descr;
     if (order_by_elem.fill_from)
@@ -710,7 +716,7 @@ static FillColumnDescription getWithFillDescription(const ASTOrderByElement & or
     return descr;
 }
 
-static SortDescription getSortDescription(const ASTSelectQuery & query, const Context & context)
+static SortDescription getSortDescription(const ASTSelectQuery & query, ContextPtr context)
 {
     SortDescription order_descr;
     order_descr.reserve(query.orderBy()->children.size());
@@ -750,7 +756,7 @@ static SortDescription getSortDescriptionFromGroupBy(const ASTSelectQuery & quer
     return order_descr;
 }
 
-static UInt64 getLimitUIntValue(const ASTPtr & node, const Context & context, const std::string & expr)
+static UInt64 getLimitUIntValue(const ASTPtr & node, ContextPtr context, const std::string & expr)
 {
     const auto & [field, type] = evaluateConstantExpression(node, context);
 
@@ -765,7 +771,7 @@ static UInt64 getLimitUIntValue(const ASTPtr & node, const Context & context, co
 }
 
 
-static std::pair<UInt64, UInt64> getLimitLengthAndOffset(const ASTSelectQuery & query, const Context & context)
+static std::pair<UInt64, UInt64> getLimitLengthAndOffset(const ASTSelectQuery & query, ContextPtr context)
 {
     UInt64 length = 0;
     UInt64 offset = 0;
@@ -782,7 +788,7 @@ static std::pair<UInt64, UInt64> getLimitLengthAndOffset(const ASTSelectQuery &
 }
 
 
-static UInt64 getLimitForSorting(const ASTSelectQuery & query, const Context & context)
+static UInt64 getLimitForSorting(const ASTSelectQuery & query, ContextPtr context)
 {
     /// Partial sort can be done if there is LIMIT but no DISTINCT or LIMIT BY, neither ARRAY JOIN.
     if (!query.distinct && !query.limitBy() && !query.limit_with_ties && !query.arrayJoinExpressionList() && query.limitLength())
@@ -1184,7 +1190,7 @@ void InterpreterSelectQuery::executeImpl(QueryPlan & query_plan, const BlockInpu
             bool has_withfill = false;
             if (query.orderBy())
             {
-                SortDescription order_descr = getSortDescription(query, *context);
+                SortDescription order_descr = getSortDescription(query, context);
                 for (auto & desc : order_descr)
                     if (desc.with_fill)
                     {
@@ -1376,7 +1382,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
             temp_query_info.syntax_analyzer_result = syntax_analyzer_result;
             temp_query_info.sets = query_analyzer->getPreparedSets();
 
-            num_rows = storage->totalRowsByPartitionPredicate(temp_query_info, *context);
+            num_rows = storage->totalRowsByPartitionPredicate(temp_query_info, context);
         }
 
         if (num_rows)
@@ -1475,9 +1481,9 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
                     auto column_decl = storage_columns.get(column);
                     column_expr = column_default->expression->clone();
                     // recursive visit for alias to alias
-                    replaceAliasColumnsInQuery(column_expr, metadata_snapshot->getColumns(), syntax_analyzer_result->getArrayJoinSourceNameSet(), *context);
+                    replaceAliasColumnsInQuery(column_expr, metadata_snapshot->getColumns(), syntax_analyzer_result->getArrayJoinSourceNameSet(), context);
 
-                    column_expr = addTypeConversionToAST(std::move(column_expr), column_decl.type->getName(), metadata_snapshot->getColumns().getAll(), *context);
+                    column_expr = addTypeConversionToAST(std::move(column_expr), column_decl.type->getName(), metadata_snapshot->getColumns().getAll(), context);
                     column_expr = setAlias(column_expr, column);
                 }
                 else
@@ -1522,8 +1528,8 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
                     = ext::map<NameSet>(required_columns_after_prewhere, [](const auto & it) { return it.name; });
             }
 
-            auto syntax_result = TreeRewriter(*context).analyze(required_columns_all_expr, required_columns_after_prewhere, storage, metadata_snapshot);
-            alias_actions = ExpressionAnalyzer(required_columns_all_expr, syntax_result, *context).getActionsDAG(true);
+            auto syntax_result = TreeRewriter(context).analyze(required_columns_all_expr, required_columns_after_prewhere, storage, metadata_snapshot);
+            alias_actions = ExpressionAnalyzer(required_columns_all_expr, syntax_result, context).getActionsDAG(true);
 
             /// The set of required columns could be added as a result of adding an action to calculate ALIAS.
             required_columns = alias_actions->getRequiredColumns().getNames();
@@ -1547,9 +1553,9 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
                     prewhere_info->prewhere_actions->tryRestoreColumn(name);
 
                 auto analyzed_result
-                    = TreeRewriter(*context).analyze(required_columns_from_prewhere_expr, metadata_snapshot->getColumns().getAllPhysical());
+                    = TreeRewriter(context).analyze(required_columns_from_prewhere_expr, metadata_snapshot->getColumns().getAllPhysical());
                 prewhere_info->alias_actions
-                    = ExpressionAnalyzer(required_columns_from_prewhere_expr, analyzed_result, *context).getActionsDAG(true, false);
+                    = ExpressionAnalyzer(required_columns_from_prewhere_expr, analyzed_result, context).getActionsDAG(true, false);
 
                 /// Add (physical?) columns required by alias actions.
                 auto required_columns_from_alias = prewhere_info->alias_actions->getRequiredColumns();
@@ -1595,7 +1601,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
 
     UInt64 max_block_size = settings.max_block_size;
 
-    auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, *context);
+    auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, context);
 
     /** Optimization - if not specified DISTINCT, WHERE, GROUP, HAVING, ORDER, LIMIT BY, WITH TIES but LIMIT is specified, and limit + offset < max_block_size,
      *  then as the block size we will use limit + offset (not to read more from the table than requested),
@@ -1638,7 +1644,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
                 throw Exception("Subquery expected", ErrorCodes::LOGICAL_ERROR);
 
             interpreter_subquery = std::make_unique<InterpreterSelectWithUnionQuery>(
-                subquery, getSubqueryContext(*context),
+                subquery, getSubqueryContext(context),
                 options.copy().subquery().noModify(), required_columns);
 
             if (query_analyzer->hasAggregation())
@@ -1660,7 +1666,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
 
         query_info.syntax_analyzer_result = syntax_analyzer_result;
         query_info.sets = query_analyzer->getPreparedSets();
-        auto actions_settings = ExpressionActionsSettings::fromContext(*context);
+        auto actions_settings = ExpressionActionsSettings::fromContext(context);
 
         if (prewhere_info)
         {
@@ -1687,7 +1693,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
             if (analysis_result.optimize_read_in_order)
                 query_info.order_optimizer = std::make_shared<ReadInOrderOptimizer>(
                     analysis_result.order_by_elements_actions,
-                    getSortDescription(query, *context),
+                    getSortDescription(query, context),
                     query_info.syntax_analyzer_result);
             else
                 query_info.order_optimizer = std::make_shared<ReadInOrderOptimizer>(
@@ -1695,7 +1701,7 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
                     getSortDescriptionFromGroupBy(query),
                     query_info.syntax_analyzer_result);
 
-            query_info.input_order_info = query_info.order_optimizer->getInputOrder(metadata_snapshot, *context);
+            query_info.input_order_info = query_info.order_optimizer->getInputOrder(metadata_snapshot, context);
         }
 
         StreamLocalLimits limits;
@@ -1715,12 +1721,12 @@ void InterpreterSelectQuery::executeFetchColumns(QueryProcessingStage::Enum proc
             quota = context->getQuota();
 
         storage->read(query_plan, required_columns, metadata_snapshot,
-                      query_info, *context, processing_stage, max_block_size, max_streams);
+                      query_info, context, processing_stage, max_block_size, max_streams);
 
         if (context->hasQueryContext() && !options.is_internal)
         {
             auto local_storage_id = storage->getStorageID();
-            context->getQueryContext().addQueryAccessInfo(
+            context->getQueryContext()->addQueryAccessInfo(
                 backQuoteIfNeed(local_storage_id.getDatabaseName()), local_storage_id.getFullTableName(), required_columns);
         }
 
@@ -2102,8 +2108,8 @@ void InterpreterSelectQuery::executeOrderOptimized(QueryPlan & query_plan, Input
 void InterpreterSelectQuery::executeOrder(QueryPlan & query_plan, InputOrderInfoPtr input_sorting_info)
 {
     auto & query = getSelectQuery();
-    SortDescription output_order_descr = getSortDescription(query, *context);
-    UInt64 limit = getLimitForSorting(query, *context);
+    SortDescription output_order_descr = getSortDescription(query, context);
+    UInt64 limit = getLimitForSorting(query, context);
 
     if (input_sorting_info)
     {
@@ -2151,8 +2157,8 @@ void InterpreterSelectQuery::executeOrder(QueryPlan & query_plan, InputOrderInfo
 void InterpreterSelectQuery::executeMergeSorted(QueryPlan & query_plan, const std::string & description)
 {
     auto & query = getSelectQuery();
-    SortDescription order_descr = getSortDescription(query, *context);
-    UInt64 limit = getLimitForSorting(query, *context);
+    SortDescription order_descr = getSortDescription(query, context);
+    UInt64 limit = getLimitForSorting(query, context);
 
     executeMergeSorted(query_plan, order_descr, limit, description);
 }
@@ -2186,7 +2192,7 @@ void InterpreterSelectQuery::executeDistinct(QueryPlan & query_plan, bool before
     {
         const Settings & settings = context->getSettingsRef();
 
-        auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, *context);
+        auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, context);
         UInt64 limit_for_distinct = 0;
 
         /// If after this stage of DISTINCT ORDER BY is not executed,
@@ -2215,7 +2221,7 @@ void InterpreterSelectQuery::executePreLimit(QueryPlan & query_plan, bool do_not
     /// If there is LIMIT
     if (query.limitLength())
     {
-        auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, *context);
+        auto [limit_length, limit_offset] = getLimitLengthAndOffset(query, context);
 
         if (do_not_skip_offset)
         {
@@ -2243,8 +2249,8 @@ void InterpreterSelectQuery::executeLimitBy(QueryPlan & query_plan)
     for (const auto & elem : query.limitBy()->children)
         columns.emplace_back(elem->getColumnName());
 
-    UInt64 length = getLimitUIntValue(query.limitByLength(), *context, "LIMIT");
-    UInt64 offset = (query.limitByOffset() ? getLimitUIntValue(query.limitByOffset(), *context, "OFFSET") : 0);
+    UInt64 length = getLimitUIntValue(query.limitByLength(), context, "LIMIT");
+    UInt64 offset = (query.limitByOffset() ? getLimitUIntValue(query.limitByOffset(), context, "OFFSET") : 0);
 
     auto limit_by = std::make_unique<LimitByStep>(query_plan.getCurrentDataStream(), length, offset, columns);
     query_plan.addStep(std::move(limit_by));
@@ -2255,7 +2261,7 @@ void InterpreterSelectQuery::executeWithFill(QueryPlan & query_plan)
     auto & query = getSelectQuery();
     if (query.orderBy())
     {
-        SortDescription order_descr = getSortDescription(query, *context);
+        SortDescription order_descr = getSortDescription(query, context);
         SortDescription fill_descr;
         for (auto & desc : order_descr)
         {
@@ -2297,14 +2303,14 @@ void InterpreterSelectQuery::executeLimit(QueryPlan & query_plan)
 
         UInt64 limit_length;
         UInt64 limit_offset;
-        std::tie(limit_length, limit_offset) = getLimitLengthAndOffset(query, *context);
+        std::tie(limit_length, limit_offset) = getLimitLengthAndOffset(query, context);
 
         SortDescription order_descr;
         if (query.limit_with_ties)
         {
             if (!query.orderBy())
                 throw Exception("LIMIT WITH TIES without ORDER BY", ErrorCodes::LOGICAL_ERROR);
-            order_descr = getSortDescription(query, *context);
+            order_descr = getSortDescription(query, context);
         }
 
         auto limit = std::make_unique<LimitStep>(
@@ -2327,7 +2333,7 @@ void InterpreterSelectQuery::executeOffset(QueryPlan & query_plan)
     {
         UInt64 limit_length;
         UInt64 limit_offset;
-        std::tie(limit_length, limit_offset) = getLimitLengthAndOffset(query, *context);
+        std::tie(limit_length, limit_offset) = getLimitLengthAndOffset(query, context);
 
         auto offsets_step = std::make_unique<OffsetStep>(query_plan.getCurrentDataStream(), limit_offset);
         query_plan.addStep(std::move(offsets_step));
@@ -2351,7 +2357,7 @@ void InterpreterSelectQuery::executeSubqueriesInSetsAndJoins(QueryPlan & query_p
     const Settings & settings = context->getSettingsRef();
 
     SizeLimits limits(settings.max_rows_to_transfer, settings.max_bytes_to_transfer, settings.transfer_overflow_mode);
-    addCreatingSetsStep(query_plan, std::move(subqueries_for_sets), limits, *context);
+    addCreatingSetsStep(query_plan, std::move(subqueries_for_sets), limits, context);
 }
 
 
@@ -2365,7 +2371,7 @@ void InterpreterSelectQuery::initSettings()
 {
     auto & query = getSelectQuery();
     if (query.settings())
-        InterpreterSetQuery(query.settings(), *context).executeForCurrentContext();
+        InterpreterSetQuery(query.settings(), context).executeForCurrentContext();
 }
 
 }
diff --git a/src/Interpreters/InterpreterSelectQuery.h b/src/Interpreters/InterpreterSelectQuery.h
index 13f4755d431..66b3fc65eff 100644
--- a/src/Interpreters/InterpreterSelectQuery.h
+++ b/src/Interpreters/InterpreterSelectQuery.h
@@ -46,28 +46,28 @@ public:
 
     InterpreterSelectQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         const SelectQueryOptions &,
         const Names & required_result_column_names_ = Names{});
 
     /// Read data not from the table specified in the query, but from the prepared source `input`.
     InterpreterSelectQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         const BlockInputStreamPtr & input_,
         const SelectQueryOptions & = {});
 
     /// Read data not from the table specified in the query, but from the prepared pipe `input`.
     InterpreterSelectQuery(
             const ASTPtr & query_ptr_,
-            const Context & context_,
+            ContextPtr context_,
             Pipe input_pipe_,
             const SelectQueryOptions & = {});
 
     /// Read data not from the table specified in the query, but from the specified `storage_`.
     InterpreterSelectQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         const StoragePtr & storage_,
         const StorageMetadataPtr & metadata_snapshot_ = nullptr,
         const SelectQueryOptions & = {});
@@ -94,7 +94,7 @@ public:
 private:
     InterpreterSelectQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         const BlockInputStreamPtr & input_,
         std::optional<Pipe> input_pipe,
         const StoragePtr & storage_,
diff --git a/src/Interpreters/InterpreterSelectWithUnionQuery.cpp b/src/Interpreters/InterpreterSelectWithUnionQuery.cpp
index 48610731ef8..3cf4a905d38 100644
--- a/src/Interpreters/InterpreterSelectWithUnionQuery.cpp
+++ b/src/Interpreters/InterpreterSelectWithUnionQuery.cpp
@@ -29,7 +29,7 @@ namespace ErrorCodes
 }
 
 InterpreterSelectWithUnionQuery::InterpreterSelectWithUnionQuery(
-    const ASTPtr & query_ptr_, const Context & context_, const SelectQueryOptions & options_, const Names & required_result_column_names)
+    const ASTPtr & query_ptr_, ContextPtr context_, const SelectQueryOptions & options_, const Names & required_result_column_names)
     : IInterpreterUnionOrSelectQuery(query_ptr_, context_, options_)
 {
     ASTSelectWithUnionQuery * ast = query_ptr->as<ASTSelectWithUnionQuery>();
@@ -197,26 +197,26 @@ Block InterpreterSelectWithUnionQuery::getCommonHeaderForUnion(const Blocks & he
 Block InterpreterSelectWithUnionQuery::getCurrentChildResultHeader(const ASTPtr & ast_ptr_, const Names & required_result_column_names)
 {
     if (ast_ptr_->as<ASTSelectWithUnionQuery>())
-        return InterpreterSelectWithUnionQuery(ast_ptr_, *context, options.copy().analyze().noModify(), required_result_column_names)
+        return InterpreterSelectWithUnionQuery(ast_ptr_, context, options.copy().analyze().noModify(), required_result_column_names)
             .getSampleBlock();
     else
-        return InterpreterSelectQuery(ast_ptr_, *context, options.copy().analyze().noModify()).getSampleBlock();
+        return InterpreterSelectQuery(ast_ptr_, context, options.copy().analyze().noModify()).getSampleBlock();
 }
 
 std::unique_ptr<IInterpreterUnionOrSelectQuery>
 InterpreterSelectWithUnionQuery::buildCurrentChildInterpreter(const ASTPtr & ast_ptr_, const Names & current_required_result_column_names)
 {
     if (ast_ptr_->as<ASTSelectWithUnionQuery>())
-        return std::make_unique<InterpreterSelectWithUnionQuery>(ast_ptr_, *context, options, current_required_result_column_names);
+        return std::make_unique<InterpreterSelectWithUnionQuery>(ast_ptr_, context, options, current_required_result_column_names);
     else
-        return std::make_unique<InterpreterSelectQuery>(ast_ptr_, *context, options, current_required_result_column_names);
+        return std::make_unique<InterpreterSelectQuery>(ast_ptr_, context, options, current_required_result_column_names);
 }
 
 InterpreterSelectWithUnionQuery::~InterpreterSelectWithUnionQuery() = default;
 
-Block InterpreterSelectWithUnionQuery::getSampleBlock(const ASTPtr & query_ptr_, const Context & context_, bool is_subquery)
+Block InterpreterSelectWithUnionQuery::getSampleBlock(const ASTPtr & query_ptr_, ContextPtr context_, bool is_subquery)
 {
-    auto & cache = context_.getSampleBlockCache();
+    auto & cache = context_->getSampleBlockCache();
     /// Using query string because query_ptr changes for every internal SELECT
     auto key = queryToString(query_ptr_);
     if (cache.find(key) != cache.end())
@@ -311,8 +311,8 @@ BlockIO InterpreterSelectWithUnionQuery::execute()
     buildQueryPlan(query_plan);
 
     auto pipeline = query_plan.buildQueryPipeline(
-        QueryPlanOptimizationSettings::fromContext(*context),
-        BuildQueryPipelineSettings::fromContext(*context));
+        QueryPlanOptimizationSettings::fromContext(context),
+        BuildQueryPipelineSettings::fromContext(context));
 
     res.pipeline = std::move(*pipeline);
     res.pipeline.addInterpreterContext(context);
diff --git a/src/Interpreters/InterpreterSelectWithUnionQuery.h b/src/Interpreters/InterpreterSelectWithUnionQuery.h
index f4062b2005e..bd18b8e7907 100644
--- a/src/Interpreters/InterpreterSelectWithUnionQuery.h
+++ b/src/Interpreters/InterpreterSelectWithUnionQuery.h
@@ -6,7 +6,6 @@
 namespace DB
 {
 
-class Context;
 class InterpreterSelectQuery;
 class QueryPlan;
 
@@ -19,7 +18,7 @@ public:
 
     InterpreterSelectWithUnionQuery(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         const SelectQueryOptions &,
         const Names & required_result_column_names = {});
 
@@ -35,7 +34,7 @@ public:
 
     static Block getSampleBlock(
         const ASTPtr & query_ptr_,
-        const Context & context_,
+        ContextPtr context_,
         bool is_subquery = false);
 
     virtual void ignoreWithTotals() override;
diff --git a/src/Interpreters/InterpreterSetQuery.cpp b/src/Interpreters/InterpreterSetQuery.cpp
index f92e9638822..1c6a4236bf6 100644
--- a/src/Interpreters/InterpreterSetQuery.cpp
+++ b/src/Interpreters/InterpreterSetQuery.cpp
@@ -9,8 +9,8 @@ namespace DB
 BlockIO InterpreterSetQuery::execute()
 {
     const auto & ast = query_ptr->as<ASTSetQuery &>();
-    context.checkSettingsConstraints(ast.changes);
-    context.getSessionContext().applySettingsChanges(ast.changes);
+    getContext()->checkSettingsConstraints(ast.changes);
+    getContext()->getSessionContext()->applySettingsChanges(ast.changes);
     return {};
 }
 
@@ -18,8 +18,8 @@ BlockIO InterpreterSetQuery::execute()
 void InterpreterSetQuery::executeForCurrentContext()
 {
     const auto & ast = query_ptr->as<ASTSetQuery &>();
-    context.checkSettingsConstraints(ast.changes);
-    context.applySettingsChanges(ast.changes);
+    getContext()->checkSettingsConstraints(ast.changes);
+    getContext()->applySettingsChanges(ast.changes);
 }
 
 }
diff --git a/src/Interpreters/InterpreterSetQuery.h b/src/Interpreters/InterpreterSetQuery.h
index 6e8e8b8b733..31519be6f29 100644
--- a/src/Interpreters/InterpreterSetQuery.h
+++ b/src/Interpreters/InterpreterSetQuery.h
@@ -7,17 +7,14 @@
 namespace DB
 {
 
-class Context;
 class ASTSetQuery;
 
-
 /** Change one or several settings for the session or just for the current context.
   */
-class InterpreterSetQuery : public IInterpreter
+class InterpreterSetQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterSetQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterSetQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     /** Usual SET query. Set setting for the session.
       */
@@ -30,8 +27,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
 
-
 }
diff --git a/src/Interpreters/InterpreterSetRoleQuery.cpp b/src/Interpreters/InterpreterSetRoleQuery.cpp
index 8d314606329..057ccd447ef 100644
--- a/src/Interpreters/InterpreterSetRoleQuery.cpp
+++ b/src/Interpreters/InterpreterSetRoleQuery.cpp
@@ -28,13 +28,13 @@ BlockIO InterpreterSetRoleQuery::execute()
 
 void InterpreterSetRoleQuery::setRole(const ASTSetRoleQuery & query)
 {
-    auto & access_control = context.getAccessControlManager();
-    auto & session_context = context.getSessionContext();
-    auto user = session_context.getUser();
+    auto & access_control = getContext()->getAccessControlManager();
+    auto session_context = getContext()->getSessionContext();
+    auto user = session_context->getUser();
 
     if (query.kind == ASTSetRoleQuery::Kind::SET_ROLE_DEFAULT)
     {
-        session_context.setCurrentRolesDefault();
+        session_context->setCurrentRolesDefault();
     }
     else
     {
@@ -53,17 +53,17 @@ void InterpreterSetRoleQuery::setRole(const ASTSetRoleQuery & query)
                 new_current_roles.emplace_back(id);
             }
         }
-        session_context.setCurrentRoles(new_current_roles);
+        session_context->setCurrentRoles(new_current_roles);
     }
 }
 
 
 void InterpreterSetRoleQuery::setDefaultRole(const ASTSetRoleQuery & query)
 {
-    context.checkAccess(AccessType::ALTER_USER);
+    getContext()->checkAccess(AccessType::ALTER_USER);
 
-    auto & access_control = context.getAccessControlManager();
-    std::vector<UUID> to_users = RolesOrUsersSet{*query.to_users, access_control, context.getUserID()}.getMatchingIDs(access_control);
+    auto & access_control = getContext()->getAccessControlManager();
+    std::vector<UUID> to_users = RolesOrUsersSet{*query.to_users, access_control, getContext()->getUserID()}.getMatchingIDs(access_control);
     RolesOrUsersSet roles_from_query{*query.roles, access_control};
 
     auto update_func = [&](const AccessEntityPtr & entity) -> AccessEntityPtr
diff --git a/src/Interpreters/InterpreterSetRoleQuery.h b/src/Interpreters/InterpreterSetRoleQuery.h
index 0919b0f23f9..70ba3c381ab 100644
--- a/src/Interpreters/InterpreterSetRoleQuery.h
+++ b/src/Interpreters/InterpreterSetRoleQuery.h
@@ -7,16 +7,14 @@
 namespace DB
 {
 
-class Context;
 class ASTSetRoleQuery;
 struct RolesOrUsersSet;
 struct User;
 
-
-class InterpreterSetRoleQuery : public IInterpreter
+class InterpreterSetRoleQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterSetRoleQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterSetRoleQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -27,6 +25,6 @@ private:
     void setDefaultRole(const ASTSetRoleQuery & query);
 
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterShowAccessEntitiesQuery.cpp b/src/Interpreters/InterpreterShowAccessEntitiesQuery.cpp
index 31c1ef874df..afd685ea983 100644
--- a/src/Interpreters/InterpreterShowAccessEntitiesQuery.cpp
+++ b/src/Interpreters/InterpreterShowAccessEntitiesQuery.cpp
@@ -17,22 +17,22 @@ namespace ErrorCodes
 using EntityType = IAccessEntity::Type;
 
 
-InterpreterShowAccessEntitiesQuery::InterpreterShowAccessEntitiesQuery(const ASTPtr & query_ptr_, Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterShowAccessEntitiesQuery::InterpreterShowAccessEntitiesQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+    : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
 
 BlockIO InterpreterShowAccessEntitiesQuery::execute()
 {
-    return executeQuery(getRewrittenQuery(), context, true);
+    return executeQuery(getRewrittenQuery(), getContext(), true);
 }
 
 
 String InterpreterShowAccessEntitiesQuery::getRewrittenQuery() const
 {
     auto & query = query_ptr->as<ASTShowAccessEntitiesQuery &>();
-    query.replaceEmptyDatabase(context.getCurrentDatabase());
+    query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
     String origin;
     String expr = "*";
     String filter, order;
diff --git a/src/Interpreters/InterpreterShowAccessEntitiesQuery.h b/src/Interpreters/InterpreterShowAccessEntitiesQuery.h
index 8fcd70919ba..7224f0d593b 100644
--- a/src/Interpreters/InterpreterShowAccessEntitiesQuery.h
+++ b/src/Interpreters/InterpreterShowAccessEntitiesQuery.h
@@ -6,12 +6,11 @@
 
 namespace DB
 {
-class Context;
 
-class InterpreterShowAccessEntitiesQuery : public IInterpreter
+class InterpreterShowAccessEntitiesQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowAccessEntitiesQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterShowAccessEntitiesQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
@@ -22,7 +21,6 @@ private:
     String getRewrittenQuery() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterShowAccessQuery.cpp b/src/Interpreters/InterpreterShowAccessQuery.cpp
index a1f8b5ed656..d2e21b71ae5 100644
--- a/src/Interpreters/InterpreterShowAccessQuery.cpp
+++ b/src/Interpreters/InterpreterShowAccessQuery.cpp
@@ -49,8 +49,8 @@ BlockInputStreamPtr InterpreterShowAccessQuery::executeImpl() const
 
 std::vector<AccessEntityPtr> InterpreterShowAccessQuery::getEntities() const
 {
-    const auto & access_control = context.getAccessControlManager();
-    context.checkAccess(AccessType::SHOW_ACCESS);
+    const auto & access_control = getContext()->getAccessControlManager();
+    getContext()->checkAccess(AccessType::SHOW_ACCESS);
 
     std::vector<AccessEntityPtr> entities;
     for (auto type : ext::range(EntityType::MAX))
@@ -71,7 +71,7 @@ std::vector<AccessEntityPtr> InterpreterShowAccessQuery::getEntities() const
 ASTs InterpreterShowAccessQuery::getCreateAndGrantQueries() const
 {
     auto entities = getEntities();
-    const auto & access_control = context.getAccessControlManager();
+    const auto & access_control = getContext()->getAccessControlManager();
 
     ASTs create_queries, grant_queries;
     for (const auto & entity : entities)
diff --git a/src/Interpreters/InterpreterShowAccessQuery.h b/src/Interpreters/InterpreterShowAccessQuery.h
index eb548c56241..d08d8962abc 100644
--- a/src/Interpreters/InterpreterShowAccessQuery.h
+++ b/src/Interpreters/InterpreterShowAccessQuery.h
@@ -6,17 +6,16 @@
 
 namespace DB
 {
-class Context;
+
 struct IAccessEntity;
 using AccessEntityPtr = std::shared_ptr<const IAccessEntity>;
 
 /** Return all queries for creating access entities and grants.
   */
-class InterpreterShowAccessQuery : public IInterpreter
+class InterpreterShowAccessQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowAccessQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterShowAccessQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -29,8 +28,6 @@ private:
     std::vector<AccessEntityPtr> getEntities() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
 
-
 }
diff --git a/src/Interpreters/InterpreterShowCreateAccessEntityQuery.cpp b/src/Interpreters/InterpreterShowCreateAccessEntityQuery.cpp
index c39fed8fb62..33e29d2b7bd 100644
--- a/src/Interpreters/InterpreterShowCreateAccessEntityQuery.cpp
+++ b/src/Interpreters/InterpreterShowCreateAccessEntityQuery.cpp
@@ -225,8 +225,8 @@ namespace
 }
 
 
-InterpreterShowCreateAccessEntityQuery::InterpreterShowCreateAccessEntityQuery(const ASTPtr & query_ptr_, const Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterShowCreateAccessEntityQuery::InterpreterShowCreateAccessEntityQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+    : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -270,9 +270,9 @@ BlockInputStreamPtr InterpreterShowCreateAccessEntityQuery::executeImpl()
 std::vector<AccessEntityPtr> InterpreterShowCreateAccessEntityQuery::getEntities() const
 {
     auto & show_query = query_ptr->as<ASTShowCreateAccessEntityQuery &>();
-    const auto & access_control = context.getAccessControlManager();
-    context.checkAccess(getRequiredAccess());
-    show_query.replaceEmptyDatabase(context.getCurrentDatabase());
+    const auto & access_control = getContext()->getAccessControlManager();
+    getContext()->checkAccess(getRequiredAccess());
+    show_query.replaceEmptyDatabase(getContext()->getCurrentDatabase());
     std::vector<AccessEntityPtr> entities;
 
     if (show_query.all)
@@ -286,12 +286,12 @@ std::vector<AccessEntityPtr> InterpreterShowCreateAccessEntityQuery::getEntities
     }
     else if (show_query.current_user)
     {
-        if (auto user = context.getUser())
+        if (auto user = getContext()->getUser())
             entities.push_back(user);
     }
     else if (show_query.current_quota)
     {
-        auto usage = context.getQuotaUsage();
+        auto usage = getContext()->getQuotaUsage();
         if (usage)
             entities.push_back(access_control.read<Quota>(usage->quota_id));
     }
@@ -341,7 +341,7 @@ ASTs InterpreterShowCreateAccessEntityQuery::getCreateQueries() const
     auto entities = getEntities();
 
     ASTs list;
-    const auto & access_control = context.getAccessControlManager();
+    const auto & access_control = getContext()->getAccessControlManager();
     for (const auto & entity : entities)
         list.push_back(getCreateQuery(*entity, access_control));
 
diff --git a/src/Interpreters/InterpreterShowCreateAccessEntityQuery.h b/src/Interpreters/InterpreterShowCreateAccessEntityQuery.h
index 5bacbd42988..6d026d2b81b 100644
--- a/src/Interpreters/InterpreterShowCreateAccessEntityQuery.h
+++ b/src/Interpreters/InterpreterShowCreateAccessEntityQuery.h
@@ -16,10 +16,10 @@ using AccessEntityPtr = std::shared_ptr<const IAccessEntity>;
 
 /** Returns a single item containing a statement which could be used to create a specified role.
   */
-class InterpreterShowCreateAccessEntityQuery : public IInterpreter
+class InterpreterShowCreateAccessEntityQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowCreateAccessEntityQuery(const ASTPtr & query_ptr_, const Context & context_);
+    InterpreterShowCreateAccessEntityQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
@@ -36,7 +36,6 @@ private:
     AccessRightsElements getRequiredAccess() const;
 
     ASTPtr query_ptr;
-    const Context & context;
 };
 
 
diff --git a/src/Interpreters/InterpreterShowCreateQuery.cpp b/src/Interpreters/InterpreterShowCreateQuery.cpp
index a853c4b9a9b..1a247dbf6e6 100644
--- a/src/Interpreters/InterpreterShowCreateQuery.cpp
+++ b/src/Interpreters/InterpreterShowCreateQuery.cpp
@@ -48,9 +48,9 @@ BlockInputStreamPtr InterpreterShowCreateQuery::executeImpl()
         (show_query = query_ptr->as<ASTShowCreateViewQuery>()))
     {
         auto resolve_table_type = show_query->temporary ? Context::ResolveExternal : Context::ResolveOrdinary;
-        auto table_id = context.resolveStorageID(*show_query, resolve_table_type);
-        context.checkAccess(AccessType::SHOW_COLUMNS, table_id);
-        create_query = DatabaseCatalog::instance().getDatabase(table_id.database_name)->getCreateTableQuery(table_id.table_name, context);
+        auto table_id = getContext()->resolveStorageID(*show_query, resolve_table_type);
+        getContext()->checkAccess(AccessType::SHOW_COLUMNS, table_id);
+        create_query = DatabaseCatalog::instance().getDatabase(table_id.database_name)->getCreateTableQuery(table_id.table_name, getContext());
         if (query_ptr->as<ASTShowCreateViewQuery>())
         {
             auto & ast_create_query = create_query->as<ASTCreateQuery &>();
@@ -62,23 +62,23 @@ BlockInputStreamPtr InterpreterShowCreateQuery::executeImpl()
     {
         if (show_query->temporary)
             throw Exception("Temporary databases are not possible.", ErrorCodes::SYNTAX_ERROR);
-        show_query->database = context.resolveDatabase(show_query->database);
-        context.checkAccess(AccessType::SHOW_DATABASES, show_query->database);
+        show_query->database = getContext()->resolveDatabase(show_query->database);
+        getContext()->checkAccess(AccessType::SHOW_DATABASES, show_query->database);
         create_query = DatabaseCatalog::instance().getDatabase(show_query->database)->getCreateDatabaseQuery();
     }
     else if ((show_query = query_ptr->as<ASTShowCreateDictionaryQuery>()))
     {
         if (show_query->temporary)
             throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
-        show_query->database = context.resolveDatabase(show_query->database);
-        context.checkAccess(AccessType::SHOW_DICTIONARIES, show_query->database, show_query->table);
+        show_query->database = getContext()->resolveDatabase(show_query->database);
+        getContext()->checkAccess(AccessType::SHOW_DICTIONARIES, show_query->database, show_query->table);
         create_query = DatabaseCatalog::instance().getDatabase(show_query->database)->getCreateDictionaryQuery(show_query->table);
     }
 
     if (!create_query)
         throw Exception("Unable to show the create query of " + show_query->table + ". Maybe it was created by the system.", ErrorCodes::THERE_IS_NO_QUERY);
 
-    if (!context.getSettingsRef().show_table_uuid_in_table_create_query_if_not_nil)
+    if (!getContext()->getSettingsRef().show_table_uuid_in_table_create_query_if_not_nil)
     {
         auto & create = create_query->as<ASTCreateQuery &>();
         create.uuid = UUIDHelpers::Nil;
diff --git a/src/Interpreters/InterpreterShowCreateQuery.h b/src/Interpreters/InterpreterShowCreateQuery.h
index 5ac98509b23..53f587d3e7d 100644
--- a/src/Interpreters/InterpreterShowCreateQuery.h
+++ b/src/Interpreters/InterpreterShowCreateQuery.h
@@ -7,16 +7,12 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Return single row with single column "statement" of type String with text of query to CREATE specified table.
   */
-class InterpreterShowCreateQuery : public IInterpreter
+class InterpreterShowCreateQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowCreateQuery(const ASTPtr & query_ptr_, const Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterShowCreateQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -24,7 +20,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    const Context & context;
 
     BlockInputStreamPtr executeImpl();
 };
diff --git a/src/Interpreters/InterpreterShowGrantsQuery.cpp b/src/Interpreters/InterpreterShowGrantsQuery.cpp
index bda5ef0f8b1..f3e554122e1 100644
--- a/src/Interpreters/InterpreterShowGrantsQuery.cpp
+++ b/src/Interpreters/InterpreterShowGrantsQuery.cpp
@@ -136,8 +136,8 @@ BlockInputStreamPtr InterpreterShowGrantsQuery::executeImpl()
 std::vector<AccessEntityPtr> InterpreterShowGrantsQuery::getEntities() const
 {
     const auto & show_query = query_ptr->as<ASTShowGrantsQuery &>();
-    const auto & access_control = context.getAccessControlManager();
-    auto ids = RolesOrUsersSet{*show_query.for_roles, access_control, context.getUserID()}.getMatchingIDs(access_control);
+    const auto & access_control = getContext()->getAccessControlManager();
+    auto ids = RolesOrUsersSet{*show_query.for_roles, access_control, getContext()->getUserID()}.getMatchingIDs(access_control);
 
     std::vector<AccessEntityPtr> entities;
     for (const auto & id : ids)
@@ -155,7 +155,7 @@ std::vector<AccessEntityPtr> InterpreterShowGrantsQuery::getEntities() const
 ASTs InterpreterShowGrantsQuery::getGrantQueries() const
 {
     auto entities = getEntities();
-    const auto & access_control = context.getAccessControlManager();
+    const auto & access_control = getContext()->getAccessControlManager();
 
     ASTs grant_queries;
     for (const auto & entity : entities)
diff --git a/src/Interpreters/InterpreterShowGrantsQuery.h b/src/Interpreters/InterpreterShowGrantsQuery.h
index f5dbd110fd0..c23aa1e3b94 100644
--- a/src/Interpreters/InterpreterShowGrantsQuery.h
+++ b/src/Interpreters/InterpreterShowGrantsQuery.h
@@ -1,22 +1,22 @@
 #pragma once
 
+#include <Core/UUID.h>
 #include <Interpreters/IInterpreter.h>
 #include <Parsers/IAST_fwd.h>
-#include <Core/UUID.h>
 
 
 namespace DB
 {
+
 class AccessControlManager;
 class ASTShowGrantsQuery;
 struct IAccessEntity;
 using AccessEntityPtr = std::shared_ptr<const IAccessEntity>;
 
-
-class InterpreterShowGrantsQuery : public IInterpreter
+class InterpreterShowGrantsQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowGrantsQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
+    InterpreterShowGrantsQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -32,6 +32,6 @@ private:
     std::vector<AccessEntityPtr> getEntities() const;
 
     ASTPtr query_ptr;
-    Context & context;
 };
+
 }
diff --git a/src/Interpreters/InterpreterShowPrivilegesQuery.cpp b/src/Interpreters/InterpreterShowPrivilegesQuery.cpp
index e88b97d8671..c566d31e2fc 100644
--- a/src/Interpreters/InterpreterShowPrivilegesQuery.cpp
+++ b/src/Interpreters/InterpreterShowPrivilegesQuery.cpp
@@ -4,7 +4,7 @@
 
 namespace DB
 {
-InterpreterShowPrivilegesQuery::InterpreterShowPrivilegesQuery(const ASTPtr & query_ptr_, Context & context_)
+InterpreterShowPrivilegesQuery::InterpreterShowPrivilegesQuery(const ASTPtr & query_ptr_, ContextPtr context_)
     : query_ptr(query_ptr_), context(context_)
 {
 }
diff --git a/src/Interpreters/InterpreterShowPrivilegesQuery.h b/src/Interpreters/InterpreterShowPrivilegesQuery.h
index 0c1a30107c0..75989263405 100644
--- a/src/Interpreters/InterpreterShowPrivilegesQuery.h
+++ b/src/Interpreters/InterpreterShowPrivilegesQuery.h
@@ -11,7 +11,7 @@ class Context;
 class InterpreterShowPrivilegesQuery : public IInterpreter
 {
 public:
-    InterpreterShowPrivilegesQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterShowPrivilegesQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
@@ -20,7 +20,7 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
+    ContextPtr context;
 };
 
 }
diff --git a/src/Interpreters/InterpreterShowProcesslistQuery.cpp b/src/Interpreters/InterpreterShowProcesslistQuery.cpp
index 697b286fe75..780ba688a89 100644
--- a/src/Interpreters/InterpreterShowProcesslistQuery.cpp
+++ b/src/Interpreters/InterpreterShowProcesslistQuery.cpp
@@ -12,7 +12,7 @@ namespace DB
 
 BlockIO InterpreterShowProcesslistQuery::execute()
 {
-    return executeQuery("SELECT * FROM system.processes", context, true);
+    return executeQuery("SELECT * FROM system.processes", getContext(), true);
 }
 
 }
diff --git a/src/Interpreters/InterpreterShowProcesslistQuery.h b/src/Interpreters/InterpreterShowProcesslistQuery.h
index fa0bbf075bd..5eedb67595e 100644
--- a/src/Interpreters/InterpreterShowProcesslistQuery.h
+++ b/src/Interpreters/InterpreterShowProcesslistQuery.h
@@ -7,16 +7,13 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Return list of currently executing queries.
   */
-class InterpreterShowProcesslistQuery : public IInterpreter
+class InterpreterShowProcesslistQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowProcesslistQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterShowProcesslistQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+        : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
@@ -27,8 +24,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
 
-
 }
diff --git a/src/Interpreters/InterpreterShowTablesQuery.cpp b/src/Interpreters/InterpreterShowTablesQuery.cpp
index 49c55fa3a93..901999f004f 100644
--- a/src/Interpreters/InterpreterShowTablesQuery.cpp
+++ b/src/Interpreters/InterpreterShowTablesQuery.cpp
@@ -18,8 +18,8 @@ namespace ErrorCodes
 }
 
 
-InterpreterShowTablesQuery::InterpreterShowTablesQuery(const ASTPtr & query_ptr_, Context & context_)
-    : query_ptr(query_ptr_), context(context_)
+InterpreterShowTablesQuery::InterpreterShowTablesQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+    : WithContext(context_), query_ptr(query_ptr_)
 {
 }
 
@@ -102,7 +102,7 @@ String InterpreterShowTablesQuery::getRewrittenQuery()
     if (query.temporary && !query.from.empty())
         throw Exception("The `FROM` and `TEMPORARY` cannot be used together in `SHOW TABLES`", ErrorCodes::SYNTAX_ERROR);
 
-    String database = context.resolveDatabase(query.from);
+    String database = getContext()->resolveDatabase(query.from);
     DatabaseCatalog::instance().assertDatabaseExists(database);
 
     WriteBufferFromOwnString rewritten_query;
@@ -142,7 +142,7 @@ String InterpreterShowTablesQuery::getRewrittenQuery()
 
 BlockIO InterpreterShowTablesQuery::execute()
 {
-    return executeQuery(getRewrittenQuery(), context, true);
+    return executeQuery(getRewrittenQuery(), getContext(), true);
 }
 
 
diff --git a/src/Interpreters/InterpreterShowTablesQuery.h b/src/Interpreters/InterpreterShowTablesQuery.h
index 4f720e68622..b61be568e35 100644
--- a/src/Interpreters/InterpreterShowTablesQuery.h
+++ b/src/Interpreters/InterpreterShowTablesQuery.h
@@ -13,10 +13,10 @@ class Context;
 /** Return a list of tables or databases meets specified conditions.
   * Interprets a query through replacing it to SELECT query from system.tables or system.databases.
   */
-class InterpreterShowTablesQuery : public IInterpreter
+class InterpreterShowTablesQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterShowTablesQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterShowTablesQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
@@ -27,7 +27,6 @@ public:
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 
     String getRewrittenQuery();
 };
diff --git a/src/Interpreters/InterpreterSystemQuery.cpp b/src/Interpreters/InterpreterSystemQuery.cpp
index 67576836d52..c13b9d97037 100644
--- a/src/Interpreters/InterpreterSystemQuery.cpp
+++ b/src/Interpreters/InterpreterSystemQuery.cpp
@@ -134,7 +134,7 @@ AccessType getRequiredAccessType(StorageActionBlockType action_type)
 /// Implements SYSTEM [START|STOP] <something action from ActionLocks>
 void InterpreterSystemQuery::startStopAction(StorageActionBlockType action_type, bool start)
 {
-    auto manager = context.getActionLocksManager();
+    auto manager = getContext()->getActionLocksManager();
     manager->cleanExpired();
 
     if (volume_ptr && action_type == ActionLocks::PartsMerge)
@@ -143,7 +143,7 @@ void InterpreterSystemQuery::startStopAction(StorageActionBlockType action_type,
     }
     else if (table_id)
     {
-        auto table = DatabaseCatalog::instance().tryGetTable(table_id, context);
+        auto table = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
         if (table)
         {
             if (start)
@@ -157,10 +157,10 @@ void InterpreterSystemQuery::startStopAction(StorageActionBlockType action_type,
     }
     else
     {
-        auto access = context.getAccess();
+        auto access = getContext()->getAccess();
         for (auto & elem : DatabaseCatalog::instance().getDatabases())
         {
-            for (auto iterator = elem.second->getTablesIterator(context); iterator->isValid(); iterator->next())
+            for (auto iterator = elem.second->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
             {
                 StoragePtr table = iterator->table();
                 if (!table)
@@ -190,8 +190,8 @@ void InterpreterSystemQuery::startStopAction(StorageActionBlockType action_type,
 }
 
 
-InterpreterSystemQuery::InterpreterSystemQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_->clone()), context(context_), log(&Poco::Logger::get("InterpreterSystemQuery"))
+InterpreterSystemQuery::InterpreterSystemQuery(const ASTPtr & query_ptr_, ContextPtr context_)
+        : WithContext(context_), query_ptr(query_ptr_->clone()), log(&Poco::Logger::get("InterpreterSystemQuery"))
 {
 }
 
@@ -201,37 +201,37 @@ BlockIO InterpreterSystemQuery::execute()
     auto & query = query_ptr->as<ASTSystemQuery &>();
 
     if (!query.cluster.empty())
-        return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster());
+        return executeDDLQueryOnCluster(query_ptr, getContext(), getRequiredAccessForDDLOnCluster());
 
     using Type = ASTSystemQuery::Type;
 
     /// Use global context with fresh system profile settings
-    Context system_context = context.getGlobalContext();
-    system_context.setSetting("profile", context.getSystemProfileName());
+    auto system_context = Context::createCopy(getContext()->getGlobalContext());
+    system_context->setSetting("profile", getContext()->getSystemProfileName());
 
     /// Make canonical query for simpler processing
     if (!query.table.empty())
-        table_id = context.resolveStorageID(StorageID(query.database, query.table), Context::ResolveOrdinary);
+        table_id = getContext()->resolveStorageID(StorageID(query.database, query.table), Context::ResolveOrdinary);
 
     if (!query.target_dictionary.empty() && !query.database.empty())
         query.target_dictionary = query.database + "." + query.target_dictionary;
 
     volume_ptr = {};
     if (!query.storage_policy.empty() && !query.volume.empty())
-        volume_ptr = context.getStoragePolicy(query.storage_policy)->getVolumeByName(query.volume);
+        volume_ptr = getContext()->getStoragePolicy(query.storage_policy)->getVolumeByName(query.volume);
 
     switch (query.type)
     {
         case Type::SHUTDOWN:
         {
-            context.checkAccess(AccessType::SYSTEM_SHUTDOWN);
+            getContext()->checkAccess(AccessType::SYSTEM_SHUTDOWN);
             if (kill(0, SIGTERM))
                 throwFromErrno("System call kill(0, SIGTERM) failed", ErrorCodes::CANNOT_KILL);
             break;
         }
         case Type::KILL:
         {
-            context.checkAccess(AccessType::SYSTEM_SHUTDOWN);
+            getContext()->checkAccess(AccessType::SYSTEM_SHUTDOWN);
             /// Exit with the same code as it is usually set by shell when process is terminated by SIGKILL.
             /// It's better than doing 'raise' or 'kill', because they have no effect for 'init' process (with pid = 0, usually in Docker).
             LOG_INFO(log, "Exit immediately as the SYSTEM KILL command has been issued.");
@@ -254,63 +254,63 @@ BlockIO InterpreterSystemQuery::execute()
         }
         case Type::DROP_DNS_CACHE:
         {
-            context.checkAccess(AccessType::SYSTEM_DROP_DNS_CACHE);
+            getContext()->checkAccess(AccessType::SYSTEM_DROP_DNS_CACHE);
             DNSResolver::instance().dropCache();
             /// Reinitialize clusters to update their resolved_addresses
-            system_context.reloadClusterConfig();
+            system_context->reloadClusterConfig();
             break;
         }
         case Type::DROP_MARK_CACHE:
-            context.checkAccess(AccessType::SYSTEM_DROP_MARK_CACHE);
-            system_context.dropMarkCache();
+            getContext()->checkAccess(AccessType::SYSTEM_DROP_MARK_CACHE);
+            system_context->dropMarkCache();
             break;
         case Type::DROP_UNCOMPRESSED_CACHE:
-            context.checkAccess(AccessType::SYSTEM_DROP_UNCOMPRESSED_CACHE);
-            system_context.dropUncompressedCache();
+            getContext()->checkAccess(AccessType::SYSTEM_DROP_UNCOMPRESSED_CACHE);
+            system_context->dropUncompressedCache();
             break;
         case Type::DROP_MMAP_CACHE:
-            context.checkAccess(AccessType::SYSTEM_DROP_MMAP_CACHE);
-            system_context.dropMMappedFileCache();
+            getContext()->checkAccess(AccessType::SYSTEM_DROP_MMAP_CACHE);
+            system_context->dropMMappedFileCache();
             break;
 #if USE_EMBEDDED_COMPILER
         case Type::DROP_COMPILED_EXPRESSION_CACHE:
-            context.checkAccess(AccessType::SYSTEM_DROP_COMPILED_EXPRESSION_CACHE);
+            getContext()->checkAccess(AccessType::SYSTEM_DROP_COMPILED_EXPRESSION_CACHE);
             if (auto * cache = CompiledExpressionCacheFactory::instance().tryGetCache())
                 cache->reset();
             break;
 #endif
         case Type::RELOAD_DICTIONARY:
         {
-            context.checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
+            getContext()->checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
 
-            auto & external_dictionaries_loader = system_context.getExternalDictionariesLoader();
-            external_dictionaries_loader.reloadDictionary(query.target_dictionary, context);
+            auto & external_dictionaries_loader = system_context->getExternalDictionariesLoader();
+            external_dictionaries_loader.reloadDictionary(query.target_dictionary, getContext());
 
             ExternalDictionariesLoader::resetAll();
             break;
         }
         case Type::RELOAD_DICTIONARIES:
         {
-            context.checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
+            getContext()->checkAccess(AccessType::SYSTEM_RELOAD_DICTIONARY);
             executeCommandsAndThrowIfError(
-                    [&] () { system_context.getExternalDictionariesLoader().reloadAllTriedToLoad(); },
-                    [&] () { system_context.getEmbeddedDictionaries().reload(); }
+                    [&] () { system_context->getExternalDictionariesLoader().reloadAllTriedToLoad(); },
+                    [&] () { system_context->getEmbeddedDictionaries().reload(); }
             );
             ExternalDictionariesLoader::resetAll();
             break;
         }
         case Type::RELOAD_EMBEDDED_DICTIONARIES:
-            context.checkAccess(AccessType::SYSTEM_RELOAD_EMBEDDED_DICTIONARIES);
-            system_context.getEmbeddedDictionaries().reload();
+            getContext()->checkAccess(AccessType::SYSTEM_RELOAD_EMBEDDED_DICTIONARIES);
+            system_context->getEmbeddedDictionaries().reload();
             break;
         case Type::RELOAD_CONFIG:
-            context.checkAccess(AccessType::SYSTEM_RELOAD_CONFIG);
-            system_context.reloadConfig();
+            getContext()->checkAccess(AccessType::SYSTEM_RELOAD_CONFIG);
+            system_context->reloadConfig();
             break;
         case Type::RELOAD_SYMBOLS:
         {
 #if defined(__ELF__) && !defined(__FreeBSD__)
-            context.checkAccess(AccessType::SYSTEM_RELOAD_SYMBOLS);
+            getContext()->checkAccess(AccessType::SYSTEM_RELOAD_SYMBOLS);
             (void)SymbolIndex::instance(true);
             break;
 #else
@@ -378,16 +378,16 @@ BlockIO InterpreterSystemQuery::execute()
             break;
         case Type::FLUSH_LOGS:
         {
-            context.checkAccess(AccessType::SYSTEM_FLUSH_LOGS);
+            getContext()->checkAccess(AccessType::SYSTEM_FLUSH_LOGS);
             executeCommandsAndThrowIfError(
-                    [&] () { if (auto query_log = context.getQueryLog()) query_log->flush(true); },
-                    [&] () { if (auto part_log = context.getPartLog("")) part_log->flush(true); },
-                    [&] () { if (auto query_thread_log = context.getQueryThreadLog()) query_thread_log->flush(true); },
-                    [&] () { if (auto trace_log = context.getTraceLog()) trace_log->flush(true); },
-                    [&] () { if (auto text_log = context.getTextLog()) text_log->flush(true); },
-                    [&] () { if (auto metric_log = context.getMetricLog()) metric_log->flush(true); },
-                    [&] () { if (auto asynchronous_metric_log = context.getAsynchronousMetricLog()) asynchronous_metric_log->flush(true); },
-                    [&] () { if (auto opentelemetry_span_log = context.getOpenTelemetrySpanLog()) opentelemetry_span_log->flush(true); }
+                    [&] () { if (auto query_log = getContext()->getQueryLog()) query_log->flush(true); },
+                    [&] () { if (auto part_log = getContext()->getPartLog("")) part_log->flush(true); },
+                    [&] () { if (auto query_thread_log = getContext()->getQueryThreadLog()) query_thread_log->flush(true); },
+                    [&] () { if (auto trace_log = getContext()->getTraceLog()) trace_log->flush(true); },
+                    [&] () { if (auto text_log = getContext()->getTextLog()) text_log->flush(true); },
+                    [&] () { if (auto metric_log = getContext()->getMetricLog()) metric_log->flush(true); },
+                    [&] () { if (auto asynchronous_metric_log = getContext()->getAsynchronousMetricLog()) asynchronous_metric_log->flush(true); },
+                    [&] () { if (auto opentelemetry_span_log = getContext()->getOpenTelemetrySpanLog()) opentelemetry_span_log->flush(true); }
             );
             break;
         }
@@ -402,12 +402,12 @@ BlockIO InterpreterSystemQuery::execute()
 }
 
 
-StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica, Context & system_context, bool need_ddl_guard)
+StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica, ContextPtr system_context, bool need_ddl_guard)
 {
-    context.checkAccess(AccessType::SYSTEM_RESTART_REPLICA, replica);
+    getContext()->checkAccess(AccessType::SYSTEM_RESTART_REPLICA, replica);
 
     auto table_ddl_guard = need_ddl_guard ? DatabaseCatalog::instance().getDDLGuard(replica.getDatabaseName(), replica.getTableName()) : nullptr;
-    auto [database, table] = DatabaseCatalog::instance().tryGetDatabaseAndTable(replica, context);
+    auto [database, table] = DatabaseCatalog::instance().tryGetDatabaseAndTable(replica, getContext());
     ASTPtr create_ast;
 
     /// Detach actions
@@ -417,8 +417,8 @@ StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica,
     table->shutdown();
     {
         /// If table was already dropped by anyone, an exception will be thrown
-        auto table_lock = table->lockExclusively(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
-        create_ast = database->getCreateTableQuery(replica.table_name, context);
+        auto table_lock = table->lockExclusively(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
+        create_ast = database->getCreateTableQuery(replica.table_name, getContext());
 
         database->detachTable(replica.table_name);
     }
@@ -436,7 +436,7 @@ StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica,
     table = StorageFactory::instance().get(create,
         data_path,
         system_context,
-        system_context.getGlobalContext(),
+        system_context->getGlobalContext(),
         columns,
         constraints,
         false);
@@ -447,7 +447,7 @@ StoragePtr InterpreterSystemQuery::tryRestartReplica(const StorageID & replica,
     return table;
 }
 
-void InterpreterSystemQuery::restartReplicas(Context & system_context)
+void InterpreterSystemQuery::restartReplicas(ContextPtr system_context)
 {
     std::vector<StorageID> replica_names;
     auto & catalog = DatabaseCatalog::instance();
@@ -455,7 +455,7 @@ void InterpreterSystemQuery::restartReplicas(Context & system_context)
     for (auto & elem : catalog.getDatabases())
     {
         DatabasePtr & database = elem.second;
-        for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next())
+        for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
         {
             if (auto table = iterator->table())
             {
@@ -490,43 +490,43 @@ void InterpreterSystemQuery::dropReplica(ASTSystemQuery & query)
 
     if (!table_id.empty())
     {
-        context.checkAccess(AccessType::SYSTEM_DROP_REPLICA, table_id);
-        StoragePtr table = DatabaseCatalog::instance().getTable(table_id, context);
+        getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA, table_id);
+        StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
 
         if (!dropReplicaImpl(query, table))
             throw Exception("Table " + table_id.getNameForLogs() + " is not replicated", ErrorCodes::BAD_ARGUMENTS);
     }
     else if (!query.database.empty())
     {
-        context.checkAccess(AccessType::SYSTEM_DROP_REPLICA, query.database);
+        getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA, query.database);
         DatabasePtr database = DatabaseCatalog::instance().getDatabase(query.database);
-        for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next())
+        for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
             dropReplicaImpl(query, iterator->table());
         LOG_TRACE(log, "Dropped replica {} from database {}", query.replica, backQuoteIfNeed(database->getDatabaseName()));
     }
     else if (query.is_drop_whole_replica)
     {
-        context.checkAccess(AccessType::SYSTEM_DROP_REPLICA);
+        getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA);
         auto databases = DatabaseCatalog::instance().getDatabases();
 
         for (auto & elem : databases)
         {
             DatabasePtr & database = elem.second;
-            for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next())
+            for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
                 dropReplicaImpl(query, iterator->table());
             LOG_TRACE(log, "Dropped replica {} from database {}", query.replica, backQuoteIfNeed(database->getDatabaseName()));
         }
     }
     else if (!query.replica_zk_path.empty())
     {
-        context.checkAccess(AccessType::SYSTEM_DROP_REPLICA);
+        getContext()->checkAccess(AccessType::SYSTEM_DROP_REPLICA);
         auto remote_replica_path = query.replica_zk_path  + "/replicas/" + query.replica;
 
         /// This check is actually redundant, but it may prevent from some user mistakes
         for (auto & elem : DatabaseCatalog::instance().getDatabases())
         {
             DatabasePtr & database = elem.second;
-            for (auto iterator = database->getTablesIterator(context); iterator->isValid(); iterator->next())
+            for (auto iterator = database->getTablesIterator(getContext()); iterator->isValid(); iterator->next())
             {
                 if (auto * storage_replicated = dynamic_cast<StorageReplicatedMergeTree *>(iterator->table().get()))
                 {
@@ -541,7 +541,7 @@ void InterpreterSystemQuery::dropReplica(ASTSystemQuery & query)
             }
         }
 
-        auto zookeeper = context.getZooKeeper();
+        auto zookeeper = getContext()->getZooKeeper();
 
         bool looks_like_table_path = zookeeper->exists(query.replica_zk_path + "/replicas") ||
                                      zookeeper->exists(query.replica_zk_path + "/dropped");
@@ -567,7 +567,7 @@ bool InterpreterSystemQuery::dropReplicaImpl(ASTSystemQuery & query, const Stora
         return false;
 
     StorageReplicatedMergeTree::Status status;
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = getContext()->getZooKeeper();
     storage_replicated->getStatus(status);
 
     /// Do not allow to drop local replicas and active remote replicas
@@ -590,13 +590,13 @@ bool InterpreterSystemQuery::dropReplicaImpl(ASTSystemQuery & query, const Stora
 
 void InterpreterSystemQuery::syncReplica(ASTSystemQuery &)
 {
-    context.checkAccess(AccessType::SYSTEM_SYNC_REPLICA, table_id);
-    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, context);
+    getContext()->checkAccess(AccessType::SYSTEM_SYNC_REPLICA, table_id);
+    StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
 
     if (auto * storage_replicated = dynamic_cast<StorageReplicatedMergeTree *>(table.get()))
     {
         LOG_TRACE(log, "Synchronizing entries in replica's queue with table's log and waiting for it to become empty");
-        if (!storage_replicated->waitForShrinkingQueueSize(0, context.getSettingsRef().receive_timeout.totalMilliseconds()))
+        if (!storage_replicated->waitForShrinkingQueueSize(0, getContext()->getSettingsRef().receive_timeout.totalMilliseconds()))
         {
             LOG_ERROR(log, "SYNC REPLICA {}: Timed out!", table_id.getNameForLogs());
             throw Exception(
@@ -611,10 +611,10 @@ void InterpreterSystemQuery::syncReplica(ASTSystemQuery &)
 
 void InterpreterSystemQuery::flushDistributed(ASTSystemQuery &)
 {
-    context.checkAccess(AccessType::SYSTEM_FLUSH_DISTRIBUTED, table_id);
+    getContext()->checkAccess(AccessType::SYSTEM_FLUSH_DISTRIBUTED, table_id);
 
-    if (auto * storage_distributed = dynamic_cast<StorageDistributed *>(DatabaseCatalog::instance().getTable(table_id, context).get()))
-        storage_distributed->flushClusterNodesAllData(context);
+    if (auto * storage_distributed = dynamic_cast<StorageDistributed *>(DatabaseCatalog::instance().getTable(table_id, getContext()).get()))
+        storage_distributed->flushClusterNodesAllData(getContext());
     else
         throw Exception("Table " + table_id.getNameForLogs() + " is not distributed", ErrorCodes::BAD_ARGUMENTS);
 }
@@ -763,7 +763,7 @@ AccessRightsElements InterpreterSystemQuery::getRequiredAccessForDDLOnCluster()
     return required_access;
 }
 
-void InterpreterSystemQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, const Context &) const
+void InterpreterSystemQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & /*ast*/, ContextPtr) const
 {
     elem.query_kind = "System";
 }
diff --git a/src/Interpreters/InterpreterSystemQuery.h b/src/Interpreters/InterpreterSystemQuery.h
index 39f8bf69a6e..d9f9e6c5d96 100644
--- a/src/Interpreters/InterpreterSystemQuery.h
+++ b/src/Interpreters/InterpreterSystemQuery.h
@@ -30,25 +30,24 @@ class ASTSystemQuery;
   * - start/stop actions for all existing tables.
   * Note that the actions for tables that will be created after this query will not be affected.
   */
-class InterpreterSystemQuery : public IInterpreter
+class InterpreterSystemQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterSystemQuery(const ASTPtr & query_ptr_, Context & context_);
+    InterpreterSystemQuery(const ASTPtr & query_ptr_, ContextPtr context_);
 
     BlockIO execute() override;
 
 private:
     ASTPtr query_ptr;
-    Context & context;
     Poco::Logger * log = nullptr;
     StorageID table_id = StorageID::createEmpty();      /// Will be set up if query contains table name
     VolumePtr volume_ptr;
 
     /// Tries to get a replicated table and restart it
     /// Returns pointer to a newly created table if the restart was successful
-    StoragePtr tryRestartReplica(const StorageID & replica, Context & context, bool need_ddl_guard = true);
+    StoragePtr tryRestartReplica(const StorageID & replica, ContextPtr context, bool need_ddl_guard = true);
 
-    void restartReplicas(Context & system_context);
+    void restartReplicas(ContextPtr system_context);
     void syncReplica(ASTSystemQuery & query);
     void dropReplica(ASTSystemQuery & query);
     bool dropReplicaImpl(ASTSystemQuery & query, const StoragePtr & table);
@@ -57,7 +56,7 @@ private:
     AccessRightsElements getRequiredAccessForDDLOnCluster() const;
     void startStopAction(StorageActionBlockType action_type, bool start);
 
-    void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, const Context &) const override;
+    void extendQueryLogElemImpl(QueryLogElement &, const ASTPtr &, ContextPtr) const override;
 };
 
 
diff --git a/src/Interpreters/InterpreterUseQuery.cpp b/src/Interpreters/InterpreterUseQuery.cpp
index 58f5b6c9a32..626d2f499c7 100644
--- a/src/Interpreters/InterpreterUseQuery.cpp
+++ b/src/Interpreters/InterpreterUseQuery.cpp
@@ -11,8 +11,8 @@ namespace DB
 BlockIO InterpreterUseQuery::execute()
 {
     const String & new_database = query_ptr->as<ASTUseQuery &>().database;
-    context.checkAccess(AccessType::SHOW_DATABASES, new_database);
-    context.getSessionContext().setCurrentDatabase(new_database);
+    getContext()->checkAccess(AccessType::SHOW_DATABASES, new_database);
+    getContext()->getSessionContext()->setCurrentDatabase(new_database);
     return {};
 }
 
diff --git a/src/Interpreters/InterpreterUseQuery.h b/src/Interpreters/InterpreterUseQuery.h
index ae409117afd..d1ce57dc64a 100644
--- a/src/Interpreters/InterpreterUseQuery.h
+++ b/src/Interpreters/InterpreterUseQuery.h
@@ -7,23 +7,17 @@
 namespace DB
 {
 
-class Context;
-
-
 /** Change default database for session.
   */
-class InterpreterUseQuery : public IInterpreter
+class InterpreterUseQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterUseQuery(const ASTPtr & query_ptr_, Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterUseQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
 private:
     ASTPtr query_ptr;
-    Context & context;
 };
 
-
 }
diff --git a/src/Interpreters/InterpreterWatchQuery.cpp b/src/Interpreters/InterpreterWatchQuery.cpp
index 757a2d1738b..84959f2f624 100644
--- a/src/Interpreters/InterpreterWatchQuery.cpp
+++ b/src/Interpreters/InterpreterWatchQuery.cpp
@@ -32,15 +32,15 @@ namespace ErrorCodes
 
 BlockIO InterpreterWatchQuery::execute()
 {
-    if (!context.getSettingsRef().allow_experimental_live_view)
+    if (!getContext()->getSettingsRef().allow_experimental_live_view)
         throw Exception("Experimental LIVE VIEW feature is not enabled (the setting 'allow_experimental_live_view')", ErrorCodes::SUPPORT_IS_DISABLED);
 
     BlockIO res;
     const ASTWatchQuery & query = typeid_cast<const ASTWatchQuery &>(*query_ptr);
-    auto table_id = context.resolveStorageID(query, Context::ResolveOrdinary);
+    auto table_id = getContext()->resolveStorageID(query, Context::ResolveOrdinary);
 
     /// Get storage
-    storage = DatabaseCatalog::instance().tryGetTable(table_id, context);
+    storage = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
 
     if (!storage)
         throw Exception("Table " + table_id.getNameForLogs() + " doesn't exist.",
@@ -48,10 +48,10 @@ BlockIO InterpreterWatchQuery::execute()
 
     /// List of columns to read to execute the query.
     Names required_columns = storage->getInMemoryMetadataPtr()->getColumns().getNamesOfPhysical();
-    context.checkAccess(AccessType::SELECT, table_id, required_columns);
+    getContext()->checkAccess(AccessType::SELECT, table_id, required_columns);
 
     /// Get context settings for this query
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
 
     /// Limitation on the number of columns to read.
     if (settings.max_columns_to_read && required_columns.size() > settings.max_columns_to_read)
@@ -71,7 +71,7 @@ BlockIO InterpreterWatchQuery::execute()
     QueryProcessingStage::Enum from_stage = QueryProcessingStage::FetchColumns;
 
     /// Watch storage
-    streams = storage->watch(required_columns, query_info, context, from_stage, max_block_size, max_streams);
+    streams = storage->watch(required_columns, query_info, getContext(), from_stage, max_block_size, max_streams);
 
     /// Constraints on the result, the quota on the result, and also callback for progress.
     if (IBlockInputStream * stream = dynamic_cast<IBlockInputStream *>(streams[0].get()))
@@ -83,7 +83,7 @@ BlockIO InterpreterWatchQuery::execute()
         limits.size_limits.overflow_mode = settings.result_overflow_mode;
 
         stream->setLimits(limits);
-        stream->setQuota(context.getQuota());
+        stream->setQuota(getContext()->getQuota());
     }
 
     res.in = streams[0];
diff --git a/src/Interpreters/InterpreterWatchQuery.h b/src/Interpreters/InterpreterWatchQuery.h
index c4aa5b9ca99..45b61a18b66 100644
--- a/src/Interpreters/InterpreterWatchQuery.h
+++ b/src/Interpreters/InterpreterWatchQuery.h
@@ -14,30 +14,27 @@ limitations under the License. */
 #include <Core/QueryProcessingStage.h>
 #include <DataStreams/BlockIO.h>
 #include <DataStreams/IBlockInputStream.h>
-#include <Parsers/IAST_fwd.h>
 #include <Interpreters/IInterpreter.h>
-#include <Storages/SelectQueryInfo.h>
+#include <Parsers/IAST_fwd.h>
 #include <Storages/IStorage.h>
+#include <Storages/SelectQueryInfo.h>
 
 namespace DB
 {
 
-class Context;
 class IAST;
 using ASTPtr = std::shared_ptr<IAST>;
 using StoragePtr = std::shared_ptr<IStorage>;
 
-class InterpreterWatchQuery : public IInterpreter
+class InterpreterWatchQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterWatchQuery(const ASTPtr & query_ptr_, const Context & context_)
-        : query_ptr(query_ptr_), context(context_) {}
+    InterpreterWatchQuery(const ASTPtr & query_ptr_, ContextPtr context_) : WithContext(context_), query_ptr(query_ptr_) {}
 
     BlockIO execute() override;
 
 private:
     ASTPtr query_ptr;
-    const Context & context;
 
     /// Table from where to read data, if not subquery.
     StoragePtr storage;
@@ -45,5 +42,4 @@ private:
     BlockInputStreams streams;
 };
 
-
 }
diff --git a/src/Interpreters/JoinedTables.cpp b/src/Interpreters/JoinedTables.cpp
index 17d7949e478..d947a3e2a48 100644
--- a/src/Interpreters/JoinedTables.cpp
+++ b/src/Interpreters/JoinedTables.cpp
@@ -1,25 +1,24 @@
 #include <Interpreters/JoinedTables.h>
-#include <Interpreters/TableJoin.h>
-#include <Interpreters/getTableExpressions.h>
-#include <Interpreters/InJoinSubqueriesPreprocessor.h>
+
 #include <Interpreters/IdentifierSemantic.h>
 #include <Interpreters/InDepthNodeVisitor.h>
-
-#include <Storages/IStorage.h>
-#include <Storages/ColumnsDescription.h>
-#include <Storages/StorageValues.h>
-#include <Storages/StorageJoin.h>
-#include <Storages/StorageDictionary.h>
-
+#include <Interpreters/InJoinSubqueriesPreprocessor.h>
+#include <Interpreters/TableJoin.h>
+#include <Interpreters/getTableExpressions.h>
 #include <Parsers/ASTFunction.h>
+#include <Parsers/ASTIdentifier.h>
+#include <Parsers/ASTQualifiedAsterisk.h>
 #include <Parsers/ASTSelectQuery.h>
 #include <Parsers/ASTSelectWithUnionQuery.h>
 #include <Parsers/ASTSubquery.h>
 #include <Parsers/ASTTablesInSelectQuery.h>
-#include <Parsers/ASTIdentifier.h>
-#include <Parsers/ASTQualifiedAsterisk.h>
 #include <Parsers/ParserTablesInSelectQuery.h>
 #include <Parsers/parseQuery.h>
+#include <Storages/ColumnsDescription.h>
+#include <Storages/IStorage.h>
+#include <Storages/StorageDictionary.h>
+#include <Storages/StorageJoin.h>
+#include <Storages/StorageValues.h>
 
 namespace DB
 {
@@ -129,7 +128,7 @@ using RenameQualifiedIdentifiersVisitor = InDepthNodeVisitor<RenameQualifiedIden
 
 }
 
-JoinedTables::JoinedTables(Context && context_, const ASTSelectQuery & select_query)
+JoinedTables::JoinedTables(ContextPtr context_, const ASTSelectQuery & select_query)
     : context(context_)
     , table_expressions(getTableExpressions(select_query))
     , left_table_expression(extractTableExpression(select_query, 0))
@@ -159,26 +158,26 @@ StoragePtr JoinedTables::getLeftTableStorage()
         return {};
 
     if (isLeftTableFunction())
-        return context.getQueryContext().executeTableFunction(left_table_expression);
+        return context->getQueryContext()->executeTableFunction(left_table_expression);
 
     StorageID table_id = StorageID::createEmpty();
     if (left_db_and_table)
     {
-        table_id = context.resolveStorageID(StorageID(left_db_and_table->database, left_db_and_table->table, left_db_and_table->uuid));
+        table_id = context->resolveStorageID(StorageID(left_db_and_table->database, left_db_and_table->table, left_db_and_table->uuid));
     }
     else /// If the table is not specified - use the table `system.one`.
     {
         table_id = StorageID("system", "one");
     }
 
-    if (auto view_source = context.getViewSource())
+    if (auto view_source = context->getViewSource())
     {
         const auto & storage_values = static_cast<const StorageValues &>(*view_source);
         auto tmp_table_id = storage_values.getStorageID();
         if (tmp_table_id.database_name == table_id.database_name && tmp_table_id.table_name == table_id.table_name)
         {
             /// Read from view source.
-            return context.getViewSource();
+            return context->getViewSource();
         }
     }
 
@@ -192,7 +191,7 @@ bool JoinedTables::resolveTables()
     if (tables_with_columns.size() != table_expressions.size())
         throw Exception("Unexpected tables count", ErrorCodes::LOGICAL_ERROR);
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
     if (settings.joined_subquery_requires_alias && tables_with_columns.size() > 1)
     {
         for (size_t i = 0; i < tables_with_columns.size(); ++i)
@@ -234,7 +233,7 @@ void JoinedTables::rewriteDistributedInAndJoins(ASTPtr & query)
 
     String database;
     if (!renamed_tables.empty())
-        database = context.getCurrentDatabase();
+        database = context->getCurrentDatabase();
 
     for (auto & [subquery, ast_tables] : renamed_tables)
     {
@@ -254,8 +253,8 @@ std::shared_ptr<TableJoin> JoinedTables::makeTableJoin(const ASTSelectQuery & se
     if (tables_with_columns.size() < 2)
         return {};
 
-    auto settings = context.getSettingsRef();
-    auto table_join = std::make_shared<TableJoin>(settings, context.getTemporaryVolume());
+    auto settings = context->getSettingsRef();
+    auto table_join = std::make_shared<TableJoin>(settings, context->getTemporaryVolume());
 
     const ASTTablesInSelectQueryElement * ast_join = select_query.join();
     const auto & table_to_join = ast_join->table_expression->as<ASTTableExpression &>();
@@ -263,7 +262,7 @@ std::shared_ptr<TableJoin> JoinedTables::makeTableJoin(const ASTSelectQuery & se
     /// TODO This syntax does not support specifying a database name.
     if (table_to_join.database_and_table_name)
     {
-        auto joined_table_id = context.resolveStorageID(table_to_join.database_and_table_name);
+        auto joined_table_id = context->resolveStorageID(table_to_join.database_and_table_name);
         StoragePtr table = DatabaseCatalog::instance().tryGetTable(joined_table_id, context);
         if (table)
         {
diff --git a/src/Interpreters/JoinedTables.h b/src/Interpreters/JoinedTables.h
index 812808fed61..52eb71e419d 100644
--- a/src/Interpreters/JoinedTables.h
+++ b/src/Interpreters/JoinedTables.h
@@ -22,11 +22,11 @@ using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
 class JoinedTables
 {
 public:
-    JoinedTables(Context && context, const ASTSelectQuery & select_query);
+    JoinedTables(ContextPtr context, const ASTSelectQuery & select_query);
 
     void reset(const ASTSelectQuery & select_query)
     {
-        *this = JoinedTables(std::move(context), select_query);
+        *this = JoinedTables(Context::createCopy(context), select_query);
     }
 
     StoragePtr getLeftTableStorage();
@@ -48,7 +48,7 @@ public:
     std::unique_ptr<InterpreterSelectWithUnionQuery> makeLeftTableSubquery(const SelectQueryOptions & select_options);
 
 private:
-    Context context;
+    ContextPtr context;
     std::vector<const ASTTableExpression *> table_expressions;
     TablesWithColumns tables_with_columns;
 
diff --git a/src/Interpreters/MonotonicityCheckVisitor.h b/src/Interpreters/MonotonicityCheckVisitor.h
index 87571a44eb0..350318047c7 100644
--- a/src/Interpreters/MonotonicityCheckVisitor.h
+++ b/src/Interpreters/MonotonicityCheckVisitor.h
@@ -26,7 +26,7 @@ public:
     struct Data
     {
         const TablesWithColumns & tables;
-        const Context & context;
+        ContextPtr context;
         const std::unordered_set<String> & group_by_function_hashes;
         Monotonicity monotonicity{true, true, true};
         ASTIdentifier * identifier = nullptr;
diff --git a/src/Interpreters/MutationsInterpreter.cpp b/src/Interpreters/MutationsInterpreter.cpp
index 3573d48b837..f7872e0f742 100644
--- a/src/Interpreters/MutationsInterpreter.cpp
+++ b/src/Interpreters/MutationsInterpreter.cpp
@@ -50,7 +50,7 @@ class FirstNonDeterministicFunctionMatcher
 public:
     struct Data
     {
-        const Context & context;
+        ContextPtr context;
         std::optional<String> nondeterministic_function_name;
     };
 
@@ -80,7 +80,7 @@ public:
 
 using FirstNonDeterministicFunctionFinder = InDepthNodeVisitor<FirstNonDeterministicFunctionMatcher, true>;
 
-std::optional<String> findFirstNonDeterministicFunctionName(const MutationCommand & command, const Context & context)
+std::optional<String> findFirstNonDeterministicFunctionName(const MutationCommand & command, ContextPtr context)
 {
     FirstNonDeterministicFunctionMatcher::Data finder_data{context, std::nullopt};
 
@@ -113,7 +113,7 @@ std::optional<String> findFirstNonDeterministicFunctionName(const MutationComman
     return {};
 }
 
-ASTPtr prepareQueryAffectedAST(const std::vector<MutationCommand> & commands, const StoragePtr & storage, const Context & context)
+ASTPtr prepareQueryAffectedAST(const std::vector<MutationCommand> & commands, const StoragePtr & storage, ContextPtr context)
 {
     /// Execute `SELECT count() FROM storage WHERE predicate1 OR predicate2 OR ...` query.
     /// The result can differ from the number of affected rows (e.g. if there is an UPDATE command that
@@ -178,7 +178,7 @@ bool isStorageTouchedByMutations(
     const StoragePtr & storage,
     const StorageMetadataPtr & metadata_snapshot,
     const std::vector<MutationCommand> & commands,
-    Context context_copy)
+    ContextPtr context_copy)
 {
     if (commands.empty())
         return false;
@@ -206,8 +206,8 @@ bool isStorageTouchedByMutations(
     if (all_commands_can_be_skipped)
         return false;
 
-    context_copy.setSetting("max_streams_to_max_threads_ratio", 1);
-    context_copy.setSetting("max_threads", 1);
+    context_copy->setSetting("max_streams_to_max_threads_ratio", 1);
+    context_copy->setSetting("max_threads", 1);
 
     ASTPtr select_query = prepareQueryAffectedAST(commands, storage, context_copy);
 
@@ -232,7 +232,7 @@ bool isStorageTouchedByMutations(
 ASTPtr getPartitionAndPredicateExpressionForMutationCommand(
     const MutationCommand & command,
     const StoragePtr & storage,
-    const Context & context
+    ContextPtr context
 )
 {
     ASTPtr partition_predicate_as_ast_func;
@@ -266,7 +266,7 @@ MutationsInterpreter::MutationsInterpreter(
     StoragePtr storage_,
     const StorageMetadataPtr & metadata_snapshot_,
     MutationCommands commands_,
-    const Context & context_,
+    ContextPtr context_,
     bool can_execute_)
     : storage(std::move(storage_))
     , metadata_snapshot(metadata_snapshot_)
@@ -649,9 +649,9 @@ ASTPtr MutationsInterpreter::prepareInterpreterSelectQuery(std::vector<Stage> &
             all_asts->children.push_back(std::make_shared<ASTIdentifier>(column));
 
         auto syntax_result = TreeRewriter(context).analyze(all_asts, all_columns, storage, metadata_snapshot);
-        if (context.hasQueryContext())
+        if (context->hasQueryContext())
             for (const auto & it : syntax_result->getScalars())
-                context.getQueryContext().addScalar(it.first, it.second);
+                context->getQueryContext()->addScalar(it.first, it.second);
 
         stage.analyzer = std::make_unique<ExpressionAnalyzer>(all_asts, syntax_result, context);
 
@@ -756,7 +756,7 @@ QueryPipelinePtr MutationsInterpreter::addStreamsForLaterStages(const std::vecto
         SubqueriesForSets & subqueries_for_sets = stage.analyzer->getSubqueriesForSets();
         if (!subqueries_for_sets.empty())
         {
-            const Settings & settings = context.getSettingsRef();
+            const Settings & settings = context->getSettingsRef();
             SizeLimits network_transfer_limits(
                     settings.max_rows_to_transfer, settings.max_bytes_to_transfer, settings.transfer_overflow_mode);
             addCreatingSetsStep(plan, std::move(subqueries_for_sets), network_transfer_limits, context);
@@ -780,7 +780,7 @@ void MutationsInterpreter::validate()
     if (!select_interpreter)
         select_interpreter = std::make_unique<InterpreterSelectQuery>(mutation_ast, context, storage, metadata_snapshot, select_limits);
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     /// For Replicated* storages mutations cannot employ non-deterministic functions
     /// because that produces inconsistencies between replicas
diff --git a/src/Interpreters/MutationsInterpreter.h b/src/Interpreters/MutationsInterpreter.h
index dcebba5743e..34a9b61771d 100644
--- a/src/Interpreters/MutationsInterpreter.h
+++ b/src/Interpreters/MutationsInterpreter.h
@@ -23,13 +23,13 @@ bool isStorageTouchedByMutations(
     const StoragePtr & storage,
     const StorageMetadataPtr & metadata_snapshot,
     const std::vector<MutationCommand> & commands,
-    Context context_copy
+    ContextPtr context_copy
 );
 
 ASTPtr getPartitionAndPredicateExpressionForMutationCommand(
     const MutationCommand & command,
     const StoragePtr & storage,
-    const Context & context
+    ContextPtr context
 );
 
 /// Create an input stream that will read data from storage and apply mutation commands (UPDATEs, DELETEs, MATERIALIZEs)
@@ -43,7 +43,7 @@ public:
         StoragePtr storage_,
         const StorageMetadataPtr & metadata_snapshot_,
         MutationCommands commands_,
-        const Context & context_,
+        ContextPtr context_,
         bool can_execute_);
 
     void validate();
@@ -74,7 +74,7 @@ private:
     StoragePtr storage;
     StorageMetadataPtr metadata_snapshot;
     MutationCommands commands;
-    Context context;
+    ContextPtr context;
     bool can_execute;
     SelectQueryOptions select_limits;
 
@@ -101,7 +101,7 @@ private:
 
     struct Stage
     {
-        Stage(const Context & context_) : expressions_chain(context_) {}
+        explicit Stage(ContextPtr context_) : expressions_chain(context_) {}
 
         ASTs filters;
         std::unordered_map<String, ASTPtr> column_to_updated;
diff --git a/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.cpp b/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.cpp
index dfc126a6c24..2420255c5c1 100644
--- a/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.cpp
+++ b/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.cpp
@@ -41,7 +41,7 @@ namespace MySQLInterpreter
 {
 
 static inline String resolveDatabase(
-    const String & database_in_query, const String & replica_mysql_database, const String & replica_clickhouse_database, const Context & context)
+    const String & database_in_query, const String & replica_mysql_database, const String & replica_clickhouse_database, ContextPtr context)
 {
     if (!database_in_query.empty())
     {
@@ -63,7 +63,7 @@ static inline String resolveDatabase(
     /// context.getCurrentDatabase() is always return `default database`
     /// When USE replica_mysql_database; CREATE TABLE table_name;
     /// context.getCurrentDatabase() is always return replica_clickhouse_database
-    const String & current_database = context.getCurrentDatabase();
+    const String & current_database = context->getCurrentDatabase();
     return current_database != replica_clickhouse_database ? "" : replica_clickhouse_database;
 }
 
@@ -117,7 +117,7 @@ static inline NamesAndTypesList getColumnsList(ASTExpressionList * columns_defin
     return columns_name_and_type;
 }
 
-static NamesAndTypesList getNames(const ASTFunction & expr, const Context & context, const NamesAndTypesList & columns)
+static NamesAndTypesList getNames(const ASTFunction & expr, ContextPtr context, const NamesAndTypesList & columns)
 {
     if (expr.arguments->children.empty())
         return NamesAndTypesList{};
@@ -158,7 +158,7 @@ static NamesAndTypesList modifyPrimaryKeysToNonNullable(const NamesAndTypesList
 }
 
 static inline std::tuple<NamesAndTypesList, NamesAndTypesList, NamesAndTypesList, NameSet> getKeys(
-    ASTExpressionList * columns_define, ASTExpressionList * indices_define, const Context & context, NamesAndTypesList & columns)
+    ASTExpressionList * columns_define, ASTExpressionList * indices_define, ContextPtr context, NamesAndTypesList & columns)
 {
     NameSet increment_columns;
     auto keys = makeASTFunction("tuple");
@@ -370,7 +370,7 @@ static ASTPtr getOrderByPolicy(
     return order_by_expression;
 }
 
-void InterpreterCreateImpl::validate(const InterpreterCreateImpl::TQuery & create_query, const Context &)
+void InterpreterCreateImpl::validate(const InterpreterCreateImpl::TQuery & create_query, ContextPtr)
 {
     /// This is dangerous, because the like table may not exists in ClickHouse
     if (create_query.like_table)
@@ -383,7 +383,7 @@ void InterpreterCreateImpl::validate(const InterpreterCreateImpl::TQuery & creat
 }
 
 ASTs InterpreterCreateImpl::getRewrittenQueries(
-    const TQuery & create_query, const Context & context, const String & mapped_to_database, const String & mysql_database)
+    const TQuery & create_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database)
 {
     auto rewritten_query = std::make_shared<ASTCreateQuery>();
     if (resolveDatabase(create_query.database, mysql_database, mapped_to_database, context) != mapped_to_database)
@@ -453,12 +453,12 @@ ASTs InterpreterCreateImpl::getRewrittenQueries(
     return ASTs{rewritten_query};
 }
 
-void InterpreterDropImpl::validate(const InterpreterDropImpl::TQuery & /*query*/, const Context & /*context*/)
+void InterpreterDropImpl::validate(const InterpreterDropImpl::TQuery & /*query*/, ContextPtr /*context*/)
 {
 }
 
 ASTs InterpreterDropImpl::getRewrittenQueries(
-    const InterpreterDropImpl::TQuery & drop_query, const Context & context, const String & mapped_to_database, const String & mysql_database)
+    const InterpreterDropImpl::TQuery & drop_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database)
 {
     const auto & database_name = resolveDatabase(drop_query.database, mysql_database, mapped_to_database, context);
 
@@ -471,14 +471,14 @@ ASTs InterpreterDropImpl::getRewrittenQueries(
     return ASTs{rewritten_query};
 }
 
-void InterpreterRenameImpl::validate(const InterpreterRenameImpl::TQuery & rename_query, const Context & /*context*/)
+void InterpreterRenameImpl::validate(const InterpreterRenameImpl::TQuery & rename_query, ContextPtr /*context*/)
 {
     if (rename_query.exchange)
         throw Exception("Cannot execute exchange for external ddl query.", ErrorCodes::NOT_IMPLEMENTED);
 }
 
 ASTs InterpreterRenameImpl::getRewrittenQueries(
-    const InterpreterRenameImpl::TQuery & rename_query, const Context & context, const String & mapped_to_database, const String & mysql_database)
+    const InterpreterRenameImpl::TQuery & rename_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database)
 {
     ASTRenameQuery::Elements elements;
     for (const auto & rename_element : rename_query.elements)
@@ -507,12 +507,12 @@ ASTs InterpreterRenameImpl::getRewrittenQueries(
     return ASTs{rewritten_query};
 }
 
-void InterpreterAlterImpl::validate(const InterpreterAlterImpl::TQuery & /*query*/, const Context & /*context*/)
+void InterpreterAlterImpl::validate(const InterpreterAlterImpl::TQuery & /*query*/, ContextPtr /*context*/)
 {
 }
 
 ASTs InterpreterAlterImpl::getRewrittenQueries(
-    const InterpreterAlterImpl::TQuery & alter_query, const Context & context, const String & mapped_to_database, const String & mysql_database)
+    const InterpreterAlterImpl::TQuery & alter_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database)
 {
     if (resolveDatabase(alter_query.database, mysql_database, mapped_to_database, context) != mapped_to_database)
         return {};
diff --git a/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.h b/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.h
index 497a661cc7f..3202612ac94 100644
--- a/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.h
+++ b/src/Interpreters/MySQL/InterpretersMySQLDDLQuery.h
@@ -1,62 +1,66 @@
 #pragma once
 
-#include <Parsers/IAST_fwd.h>
-#include <Parsers/queryToString.h>
 #include <Interpreters/IInterpreter.h>
 #include <Interpreters/executeQuery.h>
 #include <Parsers/ASTDropQuery.h>
 #include <Parsers/ASTRenameQuery.h>
+#include <Parsers/IAST_fwd.h>
 #include <Parsers/MySQL/ASTAlterQuery.h>
 #include <Parsers/MySQL/ASTCreateQuery.h>
+#include <Parsers/queryToString.h>
 
 namespace DB
 {
 
 namespace MySQLInterpreter
 {
+    struct InterpreterDropImpl
+    {
+        using TQuery = ASTDropQuery;
 
-struct InterpreterDropImpl
-{
-    using TQuery = ASTDropQuery;
+        static void validate(const TQuery & query, ContextPtr context);
 
-    static void validate(const TQuery & query, const Context & context);
+        static ASTs getRewrittenQueries(
+            const TQuery & drop_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database);
+    };
 
-    static ASTs getRewrittenQueries(const TQuery & drop_query, const Context & context, const String & mapped_to_database, const String & mysql_database);
-};
+    struct InterpreterAlterImpl
+    {
+        using TQuery = MySQLParser::ASTAlterQuery;
 
-struct InterpreterAlterImpl
-{
-    using TQuery = MySQLParser::ASTAlterQuery;
+        static void validate(const TQuery & query, ContextPtr context);
 
-    static void validate(const TQuery & query, const Context & context);
+        static ASTs getRewrittenQueries(
+            const TQuery & alter_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database);
+    };
 
-    static ASTs getRewrittenQueries(const TQuery & alter_query, const Context & context, const String & mapped_to_database, const String & mysql_database);
-};
+    struct InterpreterRenameImpl
+    {
+        using TQuery = ASTRenameQuery;
 
-struct InterpreterRenameImpl
-{
-    using TQuery = ASTRenameQuery;
+        static void validate(const TQuery & query, ContextPtr context);
 
-    static void validate(const TQuery & query, const Context & context);
+        static ASTs getRewrittenQueries(
+            const TQuery & rename_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database);
+    };
 
-    static ASTs getRewrittenQueries(const TQuery & rename_query, const Context & context, const String & mapped_to_database, const String & mysql_database);
-};
+    struct InterpreterCreateImpl
+    {
+        using TQuery = MySQLParser::ASTCreateQuery;
 
-struct InterpreterCreateImpl
-{
-    using TQuery = MySQLParser::ASTCreateQuery;
+        static void validate(const TQuery & query, ContextPtr context);
 
-    static void validate(const TQuery & query, const Context & context);
-
-    static ASTs getRewrittenQueries(const TQuery & create_query, const Context & context, const String & mapped_to_database, const String & mysql_database);
-};
+        static ASTs getRewrittenQueries(
+            const TQuery & create_query, ContextPtr context, const String & mapped_to_database, const String & mysql_database);
+    };
 
 template <typename InterpreterImpl>
-class InterpreterMySQLDDLQuery : public IInterpreter
+class InterpreterMySQLDDLQuery : public IInterpreter, WithContext
 {
 public:
-    InterpreterMySQLDDLQuery(const ASTPtr & query_ptr_, Context & context_, const String & mapped_to_database_, const String & mysql_database_)
-        : query_ptr(query_ptr_), context(context_), mapped_to_database(mapped_to_database_), mysql_database(mysql_database_)
+    InterpreterMySQLDDLQuery(
+        const ASTPtr & query_ptr_, ContextPtr context_, const String & mapped_to_database_, const String & mysql_database_)
+        : WithContext(context_), query_ptr(query_ptr_), mapped_to_database(mapped_to_database_), mysql_database(mysql_database_)
     {
     }
 
@@ -64,18 +68,17 @@ public:
     {
         const typename InterpreterImpl::TQuery & query = query_ptr->as<typename InterpreterImpl::TQuery &>();
 
-        InterpreterImpl::validate(query, context);
-        ASTs rewritten_queries = InterpreterImpl::getRewrittenQueries(query, context, mapped_to_database, mysql_database);
+        InterpreterImpl::validate(query, getContext());
+        ASTs rewritten_queries = InterpreterImpl::getRewrittenQueries(query, getContext(), mapped_to_database, mysql_database);
 
         for (const auto & rewritten_query : rewritten_queries)
-            executeQuery("/* Rewritten MySQL DDL Query */ " + queryToString(rewritten_query), context, true);
+            executeQuery("/* Rewritten MySQL DDL Query */ " + queryToString(rewritten_query), getContext(), true);
 
         return BlockIO{};
     }
 
 private:
     ASTPtr query_ptr;
-    Context & context;
     const String mapped_to_database;
     const String mysql_database;
 };
diff --git a/src/Interpreters/MySQL/tests/gtest_create_rewritten.cpp b/src/Interpreters/MySQL/tests/gtest_create_rewritten.cpp
index 5a82a570db0..77a14e780c5 100644
--- a/src/Interpreters/MySQL/tests/gtest_create_rewritten.cpp
+++ b/src/Interpreters/MySQL/tests/gtest_create_rewritten.cpp
@@ -18,7 +18,7 @@
 
 using namespace DB;
 
-static inline ASTPtr tryRewrittenCreateQuery(const String & query, const Context & context)
+static inline ASTPtr tryRewrittenCreateQuery(const String & query, ContextPtr context)
 {
     ParserExternalDDLQuery external_ddl_parser;
     ASTPtr ast = parseQuery(external_ddl_parser, "EXTERNAL DDL FROM MySQL(test_database, test_database) " + query, 0, 0);
diff --git a/src/Interpreters/OpenTelemetrySpanLog.cpp b/src/Interpreters/OpenTelemetrySpanLog.cpp
index f9ae6518af0..c72b0f3d326 100644
--- a/src/Interpreters/OpenTelemetrySpanLog.cpp
+++ b/src/Interpreters/OpenTelemetrySpanLog.cpp
@@ -116,7 +116,7 @@ OpenTelemetrySpanHolder::~OpenTelemetrySpanHolder()
             return;
         }
 
-        auto * context = thread_group->query_context;
+        auto context = thread_group->query_context.lock();
         if (!context)
         {
             // Both global and query contexts can be null when executing a
diff --git a/src/Interpreters/PartLog.cpp b/src/Interpreters/PartLog.cpp
index c180a4dd254..e4459399336 100644
--- a/src/Interpreters/PartLog.cpp
+++ b/src/Interpreters/PartLog.cpp
@@ -103,7 +103,7 @@ void PartLogElement::appendToBlock(MutableColumns & columns) const
 
 
 bool PartLog::addNewPart(
-    Context & current_context, const MutableDataPartPtr & part, UInt64 elapsed_ns, const ExecutionStatus & execution_status)
+    ContextPtr current_context, const MutableDataPartPtr & part, UInt64 elapsed_ns, const ExecutionStatus & execution_status)
 {
     return addNewParts(current_context, {part}, elapsed_ns, execution_status);
 }
@@ -120,7 +120,7 @@ inline UInt64 time_in_seconds(std::chrono::time_point<std::chrono::system_clock>
 }
 
 bool PartLog::addNewParts(
-    Context & current_context, const PartLog::MutableDataPartsVector & parts, UInt64 elapsed_ns, const ExecutionStatus & execution_status)
+    ContextPtr current_context, const PartLog::MutableDataPartsVector & parts, UInt64 elapsed_ns, const ExecutionStatus & execution_status)
 {
     if (parts.empty())
         return true;
@@ -130,7 +130,7 @@ bool PartLog::addNewParts(
     try
     {
         auto table_id = parts.front()->storage.getStorageID();
-        part_log = current_context.getPartLog(table_id.database_name); // assume parts belong to the same table
+        part_log = current_context->getPartLog(table_id.database_name); // assume parts belong to the same table
         if (!part_log)
             return false;
 
diff --git a/src/Interpreters/PartLog.h b/src/Interpreters/PartLog.h
index c946d6ce85f..edb6ab4a45f 100644
--- a/src/Interpreters/PartLog.h
+++ b/src/Interpreters/PartLog.h
@@ -69,9 +69,9 @@ class PartLog : public SystemLog<PartLogElement>
 
 public:
     /// Add a record about creation of new part.
-    static bool addNewPart(Context & context, const MutableDataPartPtr & part, UInt64 elapsed_ns,
+    static bool addNewPart(ContextPtr context, const MutableDataPartPtr & part, UInt64 elapsed_ns,
                            const ExecutionStatus & execution_status = {});
-    static bool addNewParts(Context & context, const MutableDataPartsVector & parts, UInt64 elapsed_ns,
+    static bool addNewParts(ContextPtr context, const MutableDataPartsVector & parts, UInt64 elapsed_ns,
                             const ExecutionStatus & execution_status = {});
 };
 
diff --git a/src/Interpreters/PredicateExpressionsOptimizer.cpp b/src/Interpreters/PredicateExpressionsOptimizer.cpp
index 476bdaaceea..f2e55441fb6 100644
--- a/src/Interpreters/PredicateExpressionsOptimizer.cpp
+++ b/src/Interpreters/PredicateExpressionsOptimizer.cpp
@@ -19,11 +19,11 @@ namespace ErrorCodes
 }
 
 PredicateExpressionsOptimizer::PredicateExpressionsOptimizer(
-    const Context & context_, const TablesWithColumns & tables_with_columns_, const Settings & settings)
-    : enable_optimize_predicate_expression(settings.enable_optimize_predicate_expression)
+    ContextPtr context_, const TablesWithColumns & tables_with_columns_, const Settings & settings)
+    : WithContext(context_)
+    , enable_optimize_predicate_expression(settings.enable_optimize_predicate_expression)
     , enable_optimize_predicate_expression_to_final_subquery(settings.enable_optimize_predicate_expression_to_final_subquery)
     , allow_push_predicate_when_subquery_contains_with(settings.allow_push_predicate_when_subquery_contains_with)
-    , context(context_)
     , tables_with_columns(tables_with_columns_)
 {
 }
@@ -87,7 +87,7 @@ std::vector<ASTs> PredicateExpressionsOptimizer::extractTablesPredicates(const A
 
     for (const auto & predicate_expression : splitConjunctionPredicate({where, prewhere}))
     {
-        ExpressionInfoVisitor::Data expression_info{.context = context, .tables = tables_with_columns};
+        ExpressionInfoVisitor::Data expression_info{WithContext{getContext()}, tables_with_columns};
         ExpressionInfoVisitor(expression_info).visit(predicate_expression);
 
         if (expression_info.is_stateful_function
@@ -162,7 +162,7 @@ bool PredicateExpressionsOptimizer::tryRewritePredicatesToTable(ASTPtr & table_e
     {
         auto optimize_final = enable_optimize_predicate_expression_to_final_subquery;
         auto optimize_with = allow_push_predicate_when_subquery_contains_with;
-        PredicateRewriteVisitor::Data data(context, table_predicates, table_columns, optimize_final, optimize_with);
+        PredicateRewriteVisitor::Data data(getContext(), table_predicates, table_columns, optimize_final, optimize_with);
 
         PredicateRewriteVisitor(data).visit(table_element);
         return data.is_rewrite;
@@ -187,7 +187,8 @@ bool PredicateExpressionsOptimizer::tryMovePredicatesFromHavingToWhere(ASTSelect
 
     for (const auto & moving_predicate: splitConjunctionPredicate({select_query.having()}))
     {
-        ExpressionInfoVisitor::Data expression_info{.context = context, .tables = {}};
+        TablesWithColumns tables;
+        ExpressionInfoVisitor::Data expression_info{WithContext{getContext()}, tables};
         ExpressionInfoVisitor(expression_info).visit(moving_predicate);
 
         /// TODO: If there is no group by, where, and prewhere expression, we can push down the stateful function
diff --git a/src/Interpreters/PredicateExpressionsOptimizer.h b/src/Interpreters/PredicateExpressionsOptimizer.h
index 223ac1e8998..a31b9907da6 100644
--- a/src/Interpreters/PredicateExpressionsOptimizer.h
+++ b/src/Interpreters/PredicateExpressionsOptimizer.h
@@ -1,12 +1,12 @@
 #pragma once
 
-#include <Parsers/ASTSelectQuery.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Parsers/ASTSelectQuery.h>
 
 namespace DB
 {
 
-class Context;
 struct Settings;
 
 /** Predicate optimization based on rewriting ast rules
@@ -15,10 +15,10 @@ struct Settings;
  *      - Move predicates from having to where
  *      - Push the predicate down from the current query to the having of the subquery
  */
-class PredicateExpressionsOptimizer
+class PredicateExpressionsOptimizer : WithContext
 {
 public:
-    PredicateExpressionsOptimizer(const Context & context_, const TablesWithColumns & tables_with_columns_, const Settings & settings_);
+    PredicateExpressionsOptimizer(ContextPtr context_, const TablesWithColumns & tables_with_columns_, const Settings & settings_);
 
     bool optimize(ASTSelectQuery & select_query);
 
@@ -26,7 +26,6 @@ private:
     const bool enable_optimize_predicate_expression;
     const bool enable_optimize_predicate_expression_to_final_subquery;
     const bool allow_push_predicate_when_subquery_contains_with;
-    const Context & context;
     const TablesWithColumns & tables_with_columns;
 
     std::vector<ASTs> extractTablesPredicates(const ASTPtr & where, const ASTPtr & prewhere);
diff --git a/src/Interpreters/PredicateRewriteVisitor.cpp b/src/Interpreters/PredicateRewriteVisitor.cpp
index 6f28b9050df..092d37d78dd 100644
--- a/src/Interpreters/PredicateRewriteVisitor.cpp
+++ b/src/Interpreters/PredicateRewriteVisitor.cpp
@@ -17,8 +17,16 @@ namespace DB
 {
 
 PredicateRewriteVisitorData::PredicateRewriteVisitorData(
-    const Context & context_, const ASTs & predicates_, const TableWithColumnNamesAndTypes & table_columns_, bool optimize_final_, bool optimize_with_)
-    : context(context_), predicates(predicates_), table_columns(table_columns_), optimize_final(optimize_final_), optimize_with(optimize_with_)
+    ContextPtr context_,
+    const ASTs & predicates_,
+    const TableWithColumnNamesAndTypes & table_columns_,
+    bool optimize_final_,
+    bool optimize_with_)
+    : WithContext(context_)
+    , predicates(predicates_)
+    , table_columns(table_columns_)
+    , optimize_final(optimize_final_)
+    , optimize_with(optimize_with_)
 {
 }
 
@@ -64,7 +72,7 @@ void PredicateRewriteVisitorData::visitOtherInternalSelect(ASTSelectQuery & sele
     }
 
     const Names & internal_columns = InterpreterSelectQuery(
-        temp_internal_select, context, SelectQueryOptions().analyze()).getSampleBlock().getNames();
+        temp_internal_select, getContext(), SelectQueryOptions().analyze()).getSampleBlock().getNames();
 
     if (rewriteSubquery(*temp_select_query, internal_columns))
     {
@@ -96,7 +104,7 @@ bool PredicateRewriteVisitorData::rewriteSubquery(ASTSelectQuery & subquery, con
         || (!optimize_with && subquery.with())
         || subquery.withFill()
         || subquery.limitBy() || subquery.limitLength()
-        || hasNonRewritableFunction(subquery.select(), context))
+        || hasNonRewritableFunction(subquery.select(), getContext()))
         return false;
 
     Names outer_columns = table_columns.columns.getNames();
diff --git a/src/Interpreters/PredicateRewriteVisitor.h b/src/Interpreters/PredicateRewriteVisitor.h
index 1132d93a5ec..fc076464925 100644
--- a/src/Interpreters/PredicateRewriteVisitor.h
+++ b/src/Interpreters/PredicateRewriteVisitor.h
@@ -1,15 +1,16 @@
 #pragma once
 
-#include <Parsers/IAST.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Interpreters/InDepthNodeVisitor.h>
 #include <Parsers/ASTSelectQuery.h>
 #include <Parsers/ASTSelectWithUnionQuery.h>
-#include <Interpreters/InDepthNodeVisitor.h>
-#include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Parsers/IAST.h>
 
 namespace DB
 {
 
-class PredicateRewriteVisitorData
+class PredicateRewriteVisitorData : WithContext
 {
 public:
     bool is_rewrite = false;
@@ -19,17 +20,17 @@ public:
 
     static bool needChild(const ASTPtr & node, const ASTPtr &)
     {
-        if (node && node->as<TypeToVisit>())
-            return false;
-
-        return true;
+        return !(node && node->as<TypeToVisit>());
     }
 
-    PredicateRewriteVisitorData(const Context & context_, const ASTs & predicates_,
-                                const TableWithColumnNamesAndTypes & table_columns_, bool optimize_final_, bool optimize_with_);
+    PredicateRewriteVisitorData(
+        ContextPtr context_,
+        const ASTs & predicates_,
+        const TableWithColumnNamesAndTypes & table_columns_,
+        bool optimize_final_,
+        bool optimize_with_);
 
 private:
-    const Context & context;
     const ASTs & predicates;
     const TableWithColumnNamesAndTypes & table_columns;
     bool optimize_final;
@@ -44,4 +45,5 @@ private:
 
 using PredicateRewriteMatcher = OneTypeMatcher<PredicateRewriteVisitorData, PredicateRewriteVisitorData::needChild>;
 using PredicateRewriteVisitor = InDepthNodeVisitor<PredicateRewriteMatcher, true>;
+
 }
diff --git a/src/Interpreters/ProcessList.cpp b/src/Interpreters/ProcessList.cpp
index 15bda5d213d..951ff6420c4 100644
--- a/src/Interpreters/ProcessList.cpp
+++ b/src/Interpreters/ProcessList.cpp
@@ -60,12 +60,12 @@ static bool isUnlimitedQuery(const IAST * ast)
 }
 
 
-ProcessList::EntryPtr ProcessList::insert(const String & query_, const IAST * ast, Context & query_context)
+ProcessList::EntryPtr ProcessList::insert(const String & query_, const IAST * ast, ContextPtr query_context)
 {
     EntryPtr res;
 
-    const ClientInfo & client_info = query_context.getClientInfo();
-    const Settings & settings = query_context.getSettingsRef();
+    const ClientInfo & client_info = query_context->getClientInfo();
+    const Settings & settings = query_context->getSettingsRef();
 
     if (client_info.current_query_id.empty())
         throw Exception("Query id cannot be empty", ErrorCodes::LOGICAL_ERROR);
@@ -174,12 +174,10 @@ ProcessList::EntryPtr ProcessList::insert(const String & query_, const IAST * as
         }
 
         auto process_it = processes.emplace(processes.end(),
-            query_, client_info, priorities.insert(settings.priority));
+            query_context, query_, client_info, priorities.insert(settings.priority));
 
         res = std::make_shared<Entry>(*this, process_it);
 
-        process_it->query_context = &query_context;
-
         ProcessListForUser & user_process_list = user_to_queries[client_info.current_user];
         user_process_list.queries.emplace(client_info.current_query_id, &res->get());
 
@@ -201,7 +199,7 @@ ProcessList::EntryPtr ProcessList::insert(const String & query_, const IAST * as
             /// Set query-level memory trackers
             thread_group->memory_tracker.setOrRaiseHardLimit(settings.max_memory_usage);
 
-            if (query_context.hasTraceCollector())
+            if (query_context->hasTraceCollector())
             {
                 /// Set up memory profiling
                 thread_group->memory_tracker.setOrRaiseProfilerLimit(settings.memory_profiler_step);
@@ -290,14 +288,12 @@ ProcessListEntry::~ProcessListEntry()
 
 
 QueryStatus::QueryStatus(
-    const String & query_,
-    const ClientInfo & client_info_,
-    QueryPriorities::Handle && priority_handle_)
-    :
-    query(query_),
-    client_info(client_info_),
-    priority_handle(std::move(priority_handle_)),
-    num_queries_increment{CurrentMetrics::Query}
+    ContextPtr context_, const String & query_, const ClientInfo & client_info_, QueryPriorities::Handle && priority_handle_)
+    : WithContext(context_)
+    , query(query_)
+    , client_info(client_info_)
+    , priority_handle(std::move(priority_handle_))
+    , num_queries_increment{CurrentMetrics::Query}
 {
 }
 
@@ -454,10 +450,10 @@ QueryStatusInfo QueryStatus::getInfo(bool get_thread_list, bool get_profile_even
             res.profile_counters = std::make_shared<ProfileEvents::Counters>(thread_group->performance_counters.getPartiallyAtomicSnapshot());
     }
 
-    if (get_settings && query_context)
+    if (get_settings && getContext())
     {
-        res.query_settings = std::make_shared<Settings>(query_context->getSettings());
-        res.current_database = query_context->getCurrentDatabase();
+        res.query_settings = std::make_shared<Settings>(getContext()->getSettings());
+        res.current_database = getContext()->getCurrentDatabase();
     }
 
     return res;
diff --git a/src/Interpreters/ProcessList.h b/src/Interpreters/ProcessList.h
index bc93ce7e191..3eeea9c8e5b 100644
--- a/src/Interpreters/ProcessList.h
+++ b/src/Interpreters/ProcessList.h
@@ -1,6 +1,5 @@
 #pragma once
 
-
 #include <Core/Defines.h>
 #include <DataStreams/BlockIO.h>
 #include <IO/Progress.h>
@@ -33,7 +32,6 @@ namespace CurrentMetrics
 namespace DB
 {
 
-class Context;
 struct Settings;
 class IAST;
 
@@ -72,7 +70,7 @@ struct QueryStatusInfo
 };
 
 /// Query and information about its execution.
-class QueryStatus
+class QueryStatus : public WithContext
 {
 protected:
     friend class ProcessList;
@@ -83,9 +81,6 @@ protected:
     String query;
     ClientInfo client_info;
 
-    /// Is set once when init
-    Context * query_context = nullptr;
-
     /// Info about all threads involved in query execution
     ThreadGroupStatusPtr thread_group;
 
@@ -128,6 +123,7 @@ protected:
 public:
 
     QueryStatus(
+        ContextPtr context_,
         const String & query_,
         const ClientInfo & client_info_,
         QueryPriorities::Handle && priority_handle_);
@@ -172,9 +168,6 @@ public:
 
     QueryStatusInfo getInfo(bool get_thread_list = false, bool get_profile_events = false, bool get_settings = false) const;
 
-    Context * tryGetQueryContext() { return query_context; }
-    const Context * tryGetQueryContext() const { return query_context; }
-
     /// Copies pointers to in/out streams
     void setQueryStreams(const BlockIO & io);
 
@@ -305,7 +298,7 @@ public:
       * If timeout is passed - throw an exception.
       * Don't count KILL QUERY queries.
       */
-    EntryPtr insert(const String & query_, const IAST * ast, Context & query_context);
+    EntryPtr insert(const String & query_, const IAST * ast, ContextPtr query_context);
 
     /// Number of currently executing queries.
     size_t size() const { return processes.size(); }
diff --git a/src/Interpreters/RedundantFunctionsInOrderByVisitor.h b/src/Interpreters/RedundantFunctionsInOrderByVisitor.h
index d737e877f01..f807849fb86 100644
--- a/src/Interpreters/RedundantFunctionsInOrderByVisitor.h
+++ b/src/Interpreters/RedundantFunctionsInOrderByVisitor.h
@@ -16,7 +16,7 @@ public:
     struct Data
     {
         std::unordered_set<String> & keys;
-        const Context & context;
+        ContextPtr context;
         bool redundant = true;
         bool done = false;
 
diff --git a/src/Interpreters/RemoveInjectiveFunctionsVisitor.cpp b/src/Interpreters/RemoveInjectiveFunctionsVisitor.cpp
index ae575b8aae7..f46e80a6370 100644
--- a/src/Interpreters/RemoveInjectiveFunctionsVisitor.cpp
+++ b/src/Interpreters/RemoveInjectiveFunctionsVisitor.cpp
@@ -16,7 +16,7 @@ static bool isUniq(const ASTFunction & func)
 }
 
 /// Remove injective functions of one argument: replace with a child
-static bool removeInjectiveFunction(ASTPtr & ast, const Context & context, const FunctionFactory & function_factory)
+static bool removeInjectiveFunction(ASTPtr & ast, ContextPtr context, const FunctionFactory & function_factory)
 {
     const ASTFunction * func = ast->as<ASTFunction>();
     if (!func)
@@ -46,7 +46,7 @@ void RemoveInjectiveFunctionsMatcher::visit(ASTFunction & func, ASTPtr &, const
 
         for (auto & arg : func.arguments->children)
         {
-            while (removeInjectiveFunction(arg, data.context, function_factory))
+            while (removeInjectiveFunction(arg, data.getContext(), function_factory))
                 ;
         }
     }
diff --git a/src/Interpreters/RemoveInjectiveFunctionsVisitor.h b/src/Interpreters/RemoveInjectiveFunctionsVisitor.h
index 1adde0d35b0..a3bbd562407 100644
--- a/src/Interpreters/RemoveInjectiveFunctionsVisitor.h
+++ b/src/Interpreters/RemoveInjectiveFunctionsVisitor.h
@@ -1,7 +1,8 @@
 #pragma once
 
-#include <Parsers/IAST.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/InDepthNodeVisitor.h>
+#include <Parsers/IAST.h>
 
 namespace DB
 {
@@ -12,9 +13,9 @@ class ASTFunction;
 class RemoveInjectiveFunctionsMatcher
 {
 public:
-    struct Data
+    struct Data : public WithContext
     {
-        const Context & context;
+        explicit Data(ContextPtr context_) : WithContext(context_) {}
     };
 
     static void visit(ASTPtr & ast, const Data & data);
diff --git a/src/Interpreters/SystemLog.cpp b/src/Interpreters/SystemLog.cpp
index 1667d845d77..31ceca8ec05 100644
--- a/src/Interpreters/SystemLog.cpp
+++ b/src/Interpreters/SystemLog.cpp
@@ -30,7 +30,7 @@ constexpr size_t DEFAULT_METRIC_LOG_COLLECT_INTERVAL_MILLISECONDS = 1000;
 /// Creates a system log with MergeTree engine using parameters from config
 template <typename TSystemLog>
 std::shared_ptr<TSystemLog> createSystemLog(
-    Context & context,
+    ContextPtr context,
     const String & default_database_name,
     const String & default_table_name,
     const Poco::Util::AbstractConfiguration & config,
@@ -88,7 +88,7 @@ std::shared_ptr<TSystemLog> createSystemLog(
 }
 
 
-SystemLogs::SystemLogs(Context & global_context, const Poco::Util::AbstractConfiguration & config)
+SystemLogs::SystemLogs(ContextPtr global_context, const Poco::Util::AbstractConfiguration & config)
 {
     query_log = createSystemLog<QueryLog>(global_context, "system", "query_log", config, "query_log");
     query_thread_log = createSystemLog<QueryThreadLog>(global_context, "system", "query_thread_log", config, "query_thread_log");
diff --git a/src/Interpreters/SystemLog.h b/src/Interpreters/SystemLog.h
index 4d322ce6e2c..2f7bdd4a22f 100644
--- a/src/Interpreters/SystemLog.h
+++ b/src/Interpreters/SystemLog.h
@@ -93,7 +93,7 @@ public:
 ///  because SystemLog destruction makes insert query while flushing data into underlying tables
 struct SystemLogs
 {
-    SystemLogs(Context & global_context, const Poco::Util::AbstractConfiguration & config);
+    SystemLogs(ContextPtr global_context, const Poco::Util::AbstractConfiguration & config);
     ~SystemLogs();
 
     void shutdown();
@@ -115,7 +115,7 @@ struct SystemLogs
 
 
 template <typename LogElement>
-class SystemLog : public ISystemLog, private boost::noncopyable
+class SystemLog : public ISystemLog, private boost::noncopyable, WithContext
 {
 public:
     using Self = SystemLog;
@@ -129,7 +129,7 @@ public:
       *   and new table get created - as if previous table was not exist.
       */
     SystemLog(
-        Context & context_,
+        ContextPtr context_,
         const String & database_name_,
         const String & table_name_,
         const String & storage_def_,
@@ -166,7 +166,6 @@ protected:
 
 private:
     /* Saving thread data */
-    Context & context;
     const StorageID table_id;
     const String storage_def;
     StoragePtr table;
@@ -208,12 +207,13 @@ private:
 
 
 template <typename LogElement>
-SystemLog<LogElement>::SystemLog(Context & context_,
+SystemLog<LogElement>::SystemLog(
+    ContextPtr context_,
     const String & database_name_,
     const String & table_name_,
     const String & storage_def_,
     size_t flush_interval_milliseconds_)
-    : context(context_)
+    : WithContext(context_)
     , table_id(database_name_, table_name_)
     , storage_def(storage_def_)
     , flush_interval_milliseconds(flush_interval_milliseconds_)
@@ -463,8 +463,8 @@ void SystemLog<LogElement>::flushImpl(const std::vector<LogElement> & to_flush,
         ASTPtr query_ptr(insert.release());
 
         // we need query context to do inserts to target table with MV containing subqueries or joins
-        Context insert_context(context);
-        insert_context.makeQueryContext();
+        auto insert_context = Context::createCopy(context);
+        insert_context->makeQueryContext();
 
         InterpreterInsertQuery interpreter(query_ptr, insert_context);
         BlockIO io = interpreter.execute();
@@ -494,7 +494,7 @@ void SystemLog<LogElement>::prepareTable()
 {
     String description = table_id.getNameForLogs();
 
-    table = DatabaseCatalog::instance().tryGetTable(table_id, context);
+    table = DatabaseCatalog::instance().tryGetTable(table_id, getContext());
 
     if (table)
     {
@@ -506,7 +506,8 @@ void SystemLog<LogElement>::prepareTable()
         {
             /// Rename the existing table.
             int suffix = 0;
-            while (DatabaseCatalog::instance().isTableExist({table_id.database_name, table_id.table_name + "_" + toString(suffix)}, context))
+            while (DatabaseCatalog::instance().isTableExist(
+                {table_id.database_name, table_id.table_name + "_" + toString(suffix)}, getContext()))
                 ++suffix;
 
             auto rename = std::make_shared<ASTRenameQuery>();
@@ -525,10 +526,14 @@ void SystemLog<LogElement>::prepareTable()
 
             rename->elements.emplace_back(elem);
 
-            LOG_DEBUG(log, "Existing table {} for system log has obsolete or different structure. Renaming it to {}", description, backQuoteIfNeed(to.table));
+            LOG_DEBUG(
+                log,
+                "Existing table {} for system log has obsolete or different structure. Renaming it to {}",
+                description,
+                backQuoteIfNeed(to.table));
 
-            Context query_context = context;
-            query_context.makeQueryContext();
+            auto query_context = Context::createCopy(context);
+            query_context->makeQueryContext();
             InterpreterRenameQuery(rename, query_context).execute();
 
             /// The required table will be created.
@@ -546,13 +551,14 @@ void SystemLog<LogElement>::prepareTable()
         auto create = getCreateTableQuery();
 
 
-        Context query_context = context;
-        query_context.makeQueryContext();
+        auto query_context = Context::createCopy(context);
+        query_context->makeQueryContext();
+
         InterpreterCreateQuery interpreter(create, query_context);
         interpreter.setInternal(true);
         interpreter.execute();
 
-        table = DatabaseCatalog::instance().getTable(table_id, context);
+        table = DatabaseCatalog::instance().getTable(table_id, getContext());
     }
 
     is_prepared = true;
diff --git a/src/Interpreters/TextLog.cpp b/src/Interpreters/TextLog.cpp
index 489bb302ad0..f5a0ce51d49 100644
--- a/src/Interpreters/TextLog.cpp
+++ b/src/Interpreters/TextLog.cpp
@@ -74,7 +74,7 @@ void TextLogElement::appendToBlock(MutableColumns & columns) const
     columns[i++]->insert(source_line);
 }
 
-TextLog::TextLog(Context & context_, const String & database_name_,
+TextLog::TextLog(ContextPtr context_, const String & database_name_,
         const String & table_name_, const String & storage_def_,
         size_t flush_interval_milliseconds_)
   : SystemLog<TextLogElement>(context_, database_name_, table_name_,
diff --git a/src/Interpreters/TextLog.h b/src/Interpreters/TextLog.h
index da678868be3..7ff55128a90 100644
--- a/src/Interpreters/TextLog.h
+++ b/src/Interpreters/TextLog.h
@@ -33,7 +33,7 @@ class TextLog : public SystemLog<TextLogElement>
 {
 public:
     TextLog(
-        Context & context_,
+        ContextPtr context_,
         const String & database_name_,
         const String & table_name_,
         const String & storage_def_,
diff --git a/src/Interpreters/ThreadStatusExt.cpp b/src/Interpreters/ThreadStatusExt.cpp
index c45902ae497..ec6bdb8d526 100644
--- a/src/Interpreters/ThreadStatusExt.cpp
+++ b/src/Interpreters/ThreadStatusExt.cpp
@@ -33,9 +33,11 @@ namespace ErrorCodes
 
 void ThreadStatus::applyQuerySettings()
 {
-    const Settings & settings = query_context->getSettingsRef();
+    auto query_context_ptr = query_context.lock();
+    assert(query_context_ptr);
+    const Settings & settings = query_context_ptr->getSettingsRef();
 
-    query_id = query_context->getCurrentQueryId();
+    query_id = query_context_ptr->getCurrentQueryId();
     initQueryProfiler();
 
     untracked_memory_limit = settings.max_untracked_memory;
@@ -58,26 +60,26 @@ void ThreadStatus::applyQuerySettings()
 }
 
 
-void ThreadStatus::attachQueryContext(Context & query_context_)
+void ThreadStatus::attachQueryContext(ContextPtr query_context_)
 {
-    query_context = &query_context_;
+    query_context = query_context_;
 
-    if (!global_context)
-        global_context = &query_context->getGlobalContext();
+    if (global_context.expired())
+        global_context = query_context_->getGlobalContext();
 
     if (thread_group)
     {
         std::lock_guard lock(thread_group->mutex);
 
         thread_group->query_context = query_context;
-        if (!thread_group->global_context)
+        if (thread_group->global_context.expired())
             thread_group->global_context = global_context;
     }
 
     // Generate new span for thread manually here, because we can't depend
     // on OpenTelemetrySpanHolder due to link order issues.
     // FIXME why and how is this different from setupState()?
-    thread_trace_context = query_context->query_trace_context;
+    thread_trace_context = query_context_->query_trace_context;
     if (thread_trace_context.trace_id)
     {
         thread_trace_context.span_id = thread_local_rng();
@@ -113,17 +115,17 @@ void ThreadStatus::setupState(const ThreadGroupStatusPtr & thread_group_)
         fatal_error_callback = thread_group->fatal_error_callback;
         query_context = thread_group->query_context;
 
-        if (!global_context)
+        if (global_context.expired())
             global_context = thread_group->global_context;
     }
 
-    if (query_context)
+    if (auto query_context_ptr = query_context.lock())
     {
         applyQuerySettings();
 
         // Generate new span for thread manually here, because we can't depend
         // on OpenTelemetrySpanHolder due to link order issues.
-        thread_trace_context = query_context->query_trace_context;
+        thread_trace_context = query_context_ptr->query_trace_context;
         if (thread_trace_context.trace_id)
         {
             thread_trace_context.span_id = thread_local_rng();
@@ -201,9 +203,9 @@ void ThreadStatus::initPerformanceCounters()
     // query_start_time_nanoseconds cannot be used here since RUsageCounters expect CLOCK_MONOTONIC
     *last_rusage = RUsageCounters::current();
 
-    if (query_context)
+    if (auto query_context_ptr = query_context.lock())
     {
-        const Settings & settings = query_context->getSettingsRef();
+        const Settings & settings = query_context_ptr->getSettingsRef();
         if (settings.metrics_perf_events_enabled)
         {
             try
@@ -246,8 +248,8 @@ void ThreadStatus::finalizePerformanceCounters()
     // 'select 1 settings metrics_perf_events_enabled = 1', I still get
     // query_context->getSettingsRef().metrics_perf_events_enabled == 0 *shrug*.
     bool close_perf_descriptors = true;
-    if (query_context)
-        close_perf_descriptors = !query_context->getSettingsRef().metrics_perf_events_enabled;
+    if (auto query_context_ptr = query_context.lock())
+        close_perf_descriptors = !query_context_ptr->getSettingsRef().metrics_perf_events_enabled;
 
     try
     {
@@ -262,17 +264,19 @@ void ThreadStatus::finalizePerformanceCounters()
 
     try
     {
-        if (global_context && query_context)
+        auto global_context_ptr = global_context.lock();
+        auto query_context_ptr = query_context.lock();
+        if (global_context_ptr && query_context_ptr)
         {
-            const auto & settings = query_context->getSettingsRef();
+            const auto & settings = query_context_ptr->getSettingsRef();
             if (settings.log_queries && settings.log_query_threads)
             {
                 const auto now = std::chrono::system_clock::now();
                 Int64 query_duration_ms = (time_in_microseconds(now) - query_start_time_microseconds) / 1000;
                 if (query_duration_ms >= settings.log_queries_min_query_duration_ms.totalMilliseconds())
                 {
-                    if (auto thread_log = global_context->getQueryThreadLog())
-                        logToQueryThreadLog(*thread_log, query_context->getCurrentDatabase(), now);
+                    if (auto thread_log = global_context_ptr->getQueryThreadLog())
+                        logToQueryThreadLog(*thread_log, query_context_ptr->getCurrentDatabase(), now);
                 }
             }
         }
@@ -286,10 +290,13 @@ void ThreadStatus::finalizePerformanceCounters()
 void ThreadStatus::initQueryProfiler()
 {
     /// query profilers are useless without trace collector
-    if (!global_context || !global_context->hasTraceCollector())
+    auto global_context_ptr = global_context.lock();
+    if (!global_context_ptr || !global_context_ptr->hasTraceCollector())
         return;
 
-    const auto & settings = query_context->getSettingsRef();
+    auto query_context_ptr = query_context.lock();
+    assert(query_context_ptr);
+    const auto & settings = query_context_ptr->getSettingsRef();
 
     try
     {
@@ -327,9 +334,10 @@ void ThreadStatus::detachQuery(bool exit_if_already_detached, bool thread_exits)
     assertState({ThreadState::AttachedToQuery}, __PRETTY_FUNCTION__);
 
     std::shared_ptr<OpenTelemetrySpanLog> opentelemetry_span_log;
-    if (thread_trace_context.trace_id && query_context)
+    auto query_context_ptr = query_context.lock();
+    if (thread_trace_context.trace_id && query_context_ptr)
     {
-        opentelemetry_span_log = query_context->getOpenTelemetrySpanLog();
+        opentelemetry_span_log = query_context_ptr->getOpenTelemetrySpanLog();
     }
 
     if (opentelemetry_span_log)
@@ -349,7 +357,8 @@ void ThreadStatus::detachQuery(bool exit_if_already_detached, bool thread_exits)
         // is going to fail, because we're going to reset it to zero later in
         // this function.
         span.span_id = thread_trace_context.span_id;
-        span.parent_span_id = query_context->query_trace_context.span_id;
+        assert(query_context_ptr);
+        span.parent_span_id = query_context_ptr->query_trace_context.span_id;
         span.operation_name = getThreadName();
         span.start_time_us = query_start_time_microseconds;
         span.finish_time_us =
@@ -372,7 +381,7 @@ void ThreadStatus::detachQuery(bool exit_if_already_detached, bool thread_exits)
     memory_tracker.setParent(thread_group->memory_tracker.getParent());
 
     query_id.clear();
-    query_context = nullptr;
+    query_context.reset();
     thread_trace_context.trace_id = 0;
     thread_trace_context.span_id = 0;
     thread_group.reset();
@@ -431,11 +440,12 @@ void ThreadStatus::logToQueryThreadLog(QueryThreadLog & thread_log, const String
         }
     }
 
-    if (query_context)
+    auto query_context_ptr = query_context.lock();
+    if (query_context_ptr)
     {
-        elem.client_info = query_context->getClientInfo();
+        elem.client_info = query_context_ptr->getClientInfo();
 
-        if (query_context->getSettingsRef().log_profile_events != 0)
+        if (query_context_ptr->getSettingsRef().log_profile_events != 0)
         {
             /// NOTE: Here we are in the same thread, so we can make memcpy()
             elem.profile_counters = std::make_shared<ProfileEvents::Counters>(performance_counters.getPartiallyAtomicSnapshot());
@@ -469,7 +479,7 @@ void CurrentThread::attachToIfDetached(const ThreadGroupStatusPtr & thread_group
     current_thread->deleter = CurrentThread::defaultThreadDeleter;
 }
 
-void CurrentThread::attachQueryContext(Context & query_context)
+void CurrentThread::attachQueryContext(ContextPtr query_context)
 {
     if (unlikely(!current_thread))
         return;
@@ -498,12 +508,12 @@ void CurrentThread::detachQueryIfNotDetached()
 }
 
 
-CurrentThread::QueryScope::QueryScope(Context & query_context)
+CurrentThread::QueryScope::QueryScope(ContextPtr query_context)
 {
     CurrentThread::initializeQuery();
     CurrentThread::attachQueryContext(query_context);
-    if (!query_context.hasQueryContext())
-        query_context.makeQueryContext();
+    if (!query_context->hasQueryContext())
+        query_context->makeQueryContext();
 }
 
 void CurrentThread::QueryScope::logPeakMemoryUsage()
diff --git a/src/Interpreters/TreeOptimizer.cpp b/src/Interpreters/TreeOptimizer.cpp
index 3f4c2e74e23..5b06c00435a 100644
--- a/src/Interpreters/TreeOptimizer.cpp
+++ b/src/Interpreters/TreeOptimizer.cpp
@@ -81,7 +81,7 @@ void appendUnusedGroupByColumn(ASTSelectQuery * select_query, const NameSet & so
 }
 
 /// Eliminates injective function calls and constant expressions from group by statement.
-void optimizeGroupBy(ASTSelectQuery * select_query, const NameSet & source_columns, const Context & context)
+void optimizeGroupBy(ASTSelectQuery * select_query, const NameSet & source_columns, ContextPtr context)
 {
     const FunctionFactory & function_factory = FunctionFactory::instance();
 
@@ -135,7 +135,7 @@ void optimizeGroupBy(ASTSelectQuery * select_query, const NameSet & source_colum
                 const auto & dict_name = dict_name_ast->value.safeGet<String>();
                 const auto & attr_name = attr_name_ast->value.safeGet<String>();
 
-                const auto & dict_ptr = context.getExternalDictionariesLoader().getDictionary(dict_name, context);
+                const auto & dict_ptr = context->getExternalDictionariesLoader().getDictionary(dict_name, context);
                 if (!dict_ptr->isInjective(attr_name))
                 {
                     ++i;
@@ -270,7 +270,7 @@ void optimizeDuplicatesInOrderBy(const ASTSelectQuery * select_query)
 }
 
 /// Optimize duplicate ORDER BY
-void optimizeDuplicateOrderBy(ASTPtr & query, const Context & context)
+void optimizeDuplicateOrderBy(ASTPtr & query, ContextPtr context)
 {
     DuplicateOrderByVisitor::Data order_by_data{context};
     DuplicateOrderByVisitor(order_by_data).visit(query);
@@ -396,7 +396,7 @@ void optimizeDuplicateDistinct(ASTSelectQuery & select)
 
 /// Replace monotonous functions in ORDER BY if they don't participate in GROUP BY expression,
 /// has a single argument and not an aggregate functions.
-void optimizeMonotonousFunctionsInOrderBy(ASTSelectQuery * select_query, const Context & context,
+void optimizeMonotonousFunctionsInOrderBy(ASTSelectQuery * select_query, ContextPtr context,
                                           const TablesWithColumns & tables_with_columns,
                                           const Names & sorting_key_columns)
 {
@@ -448,7 +448,7 @@ void optimizeMonotonousFunctionsInOrderBy(ASTSelectQuery * select_query, const C
 /// Optimize ORDER BY x, y, f(x), g(x, y), f(h(x)), t(f(x), g(x)) into ORDER BY x, y
 /// in case if f(), g(), h(), t() are deterministic (in scope of query).
 /// Don't optimize ORDER BY f(x), g(x), x even if f(x) is bijection for x or g(x).
-void optimizeRedundantFunctionsInOrderBy(const ASTSelectQuery * select_query, const Context & context)
+void optimizeRedundantFunctionsInOrderBy(const ASTSelectQuery * select_query, ContextPtr context)
 {
     const auto & order_by = select_query->orderBy();
     if (!order_by)
@@ -561,9 +561,9 @@ void optimizeCountConstantAndSumOne(ASTPtr & query)
 }
 
 
-void optimizeInjectiveFunctionsInsideUniq(ASTPtr & query, const Context & context)
+void optimizeInjectiveFunctionsInsideUniq(ASTPtr & query, ContextPtr context)
 {
-    RemoveInjectiveFunctionsVisitor::Data data = {context};
+    RemoveInjectiveFunctionsVisitor::Data data(context);
     RemoveInjectiveFunctionsVisitor(data).visit(query);
 }
 
@@ -592,10 +592,10 @@ void TreeOptimizer::optimizeIf(ASTPtr & query, Aliases & aliases, bool if_chain_
 
 void TreeOptimizer::apply(ASTPtr & query, Aliases & aliases, const NameSet & source_columns_set,
                           const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns,
-                          const Context & context, const StorageMetadataPtr & metadata_snapshot,
+                          ContextPtr context, const StorageMetadataPtr & metadata_snapshot,
                           bool & rewrite_subqueries)
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
 
     auto * select_query = query->as<ASTSelectQuery>();
     if (!select_query)
diff --git a/src/Interpreters/TreeOptimizer.h b/src/Interpreters/TreeOptimizer.h
index a10dfc57451..b268b230f4e 100644
--- a/src/Interpreters/TreeOptimizer.h
+++ b/src/Interpreters/TreeOptimizer.h
@@ -1,13 +1,13 @@
 #pragma once
 
-#include <Parsers/IAST_fwd.h>
 #include <Interpreters/Aliases.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Parsers/IAST_fwd.h>
 
 namespace DB
 {
 
-class Context;
 struct StorageInMemoryMetadata;
 using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
 
@@ -16,10 +16,14 @@ using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
 class TreeOptimizer
 {
 public:
-    static void apply(ASTPtr & query, Aliases & aliases, const NameSet & source_columns_set,
-                      const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns,
-                      const Context & context, const StorageMetadataPtr & metadata_snapshot,
-                      bool & rewrite_subqueries);
+    static void apply(
+        ASTPtr & query,
+        Aliases & aliases,
+        const NameSet & source_columns_set,
+        const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns,
+        ContextPtr context,
+        const StorageMetadataPtr & metadata_snapshot,
+        bool & rewrite_subqueries);
 
     static void optimizeIf(ASTPtr & query, Aliases & aliases, bool if_chain_to_multiif);
 };
diff --git a/src/Interpreters/TreeRewriter.cpp b/src/Interpreters/TreeRewriter.cpp
index 73d7d3d004c..70f191c579d 100644
--- a/src/Interpreters/TreeRewriter.cpp
+++ b/src/Interpreters/TreeRewriter.cpp
@@ -307,10 +307,10 @@ void removeUnneededColumnsFromSelectClause(const ASTSelectQuery * select_query,
 }
 
 /// Replacing scalar subqueries with constant values.
-void executeScalarSubqueries(ASTPtr & query, const Context & context, size_t subquery_depth, Scalars & scalars, bool only_analyze)
+void executeScalarSubqueries(ASTPtr & query, ContextPtr context, size_t subquery_depth, Scalars & scalars, bool only_analyze)
 {
     LogAST log;
-    ExecuteScalarSubqueriesVisitor::Data visitor_data{context, subquery_depth, scalars, only_analyze};
+    ExecuteScalarSubqueriesVisitor::Data visitor_data{WithContext{context}, subquery_depth, scalars, only_analyze};
     ExecuteScalarSubqueriesVisitor(visitor_data, log.stream()).visit(query);
 }
 
@@ -789,7 +789,7 @@ TreeRewriterResultPtr TreeRewriter::analyzeSelect(
     size_t subquery_depth = select_options.subquery_depth;
     bool remove_duplicates = select_options.remove_duplicates;
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
 
     const NameSet & source_columns_set = result.source_columns_set;
 
@@ -832,9 +832,10 @@ TreeRewriterResultPtr TreeRewriter::analyzeSelect(
     removeUnneededColumnsFromSelectClause(select_query, required_result_columns, remove_duplicates);
 
     /// Executing scalar subqueries - replacing them with constant values.
-    executeScalarSubqueries(query, context, subquery_depth, result.scalars, select_options.only_analyze);
+    executeScalarSubqueries(query, getContext(), subquery_depth, result.scalars, select_options.only_analyze);
 
-    TreeOptimizer::apply(query, result.aliases, source_columns_set, tables_with_columns, context, result.metadata_snapshot, result.rewrite_subqueries);
+    TreeOptimizer::apply(
+        query, result.aliases, source_columns_set, tables_with_columns, getContext(), result.metadata_snapshot, result.rewrite_subqueries);
 
     /// array_join_alias_to_name, array_join_result_to_source.
     getArrayJoinedColumns(query, result, select_query, result.source_columns, source_columns_set);
@@ -850,7 +851,7 @@ TreeRewriterResultPtr TreeRewriter::analyzeSelect(
     /// rewrite filters for select query, must go after getArrayJoinedColumns
     if (settings.optimize_respect_aliases && result.metadata_snapshot)
     {
-        replaceAliasColumnsInQuery(query, result.metadata_snapshot->getColumns(), result.getArrayJoinSourceNameSet(), context);
+        replaceAliasColumnsInQuery(query, result.metadata_snapshot->getColumns(), result.getArrayJoinSourceNameSet(), getContext());
     }
 
     result.aggregates = getAggregates(query, *select_query);
@@ -877,14 +878,14 @@ TreeRewriterResultPtr TreeRewriter::analyze(
     if (query->as<ASTSelectQuery>())
         throw Exception("Not select analyze for select asts.", ErrorCodes::LOGICAL_ERROR);
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = getContext()->getSettingsRef();
 
     TreeRewriterResult result(source_columns, storage, metadata_snapshot, false);
 
     normalize(query, result.aliases, result.source_columns_set, settings);
 
     /// Executing scalar subqueries. Column defaults could be a scalar subquery.
-    executeScalarSubqueries(query, context, 0, result.scalars, false);
+    executeScalarSubqueries(query, getContext(), 0, result.scalars, false);
 
     TreeOptimizer::optimizeIf(query, result.aliases, settings.optimize_if_chain_to_multiif);
 
diff --git a/src/Interpreters/TreeRewriter.h b/src/Interpreters/TreeRewriter.h
index 4e3fe21bde9..26cfaad1fbb 100644
--- a/src/Interpreters/TreeRewriter.h
+++ b/src/Interpreters/TreeRewriter.h
@@ -3,8 +3,9 @@
 #include <Core/Block.h>
 #include <Core/NamesAndTypes.h>
 #include <Interpreters/Aliases.h>
-#include <Interpreters/SelectQueryOptions.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/DatabaseAndTableWithAlias.h>
+#include <Interpreters/SelectQueryOptions.h>
 #include <Storages/IStorage_fwd.h>
 
 namespace DB
@@ -13,7 +14,6 @@ namespace DB
 class ASTFunction;
 struct ASTTablesInSelectQueryElement;
 class TableJoin;
-class Context;
 struct Settings;
 struct SelectQueryOptions;
 using Scalars = std::map<String, Block>;
@@ -92,12 +92,10 @@ using TreeRewriterResultPtr = std::shared_ptr<const TreeRewriterResult>;
 ///  * scalar subqueries are executed replaced with constants
 ///  * unneeded columns are removed from SELECT clause
 ///  * duplicated columns are removed from ORDER BY, LIMIT BY, USING(...).
-class TreeRewriter
+class TreeRewriter : WithContext
 {
 public:
-    TreeRewriter(const Context & context_)
-        : context(context_)
-    {}
+    explicit TreeRewriter(ContextPtr context_) : WithContext(context_) {}
 
     /// Analyze and rewrite not select query
     TreeRewriterResultPtr analyze(
@@ -117,8 +115,6 @@ public:
         std::shared_ptr<TableJoin> table_join = {}) const;
 
 private:
-    const Context & context;
-
     static void normalize(ASTPtr & query, Aliases & aliases, const NameSet & source_columns_set, const Settings & settings);
 };
 
diff --git a/src/Interpreters/addMissingDefaults.cpp b/src/Interpreters/addMissingDefaults.cpp
index bb444103d8e..ef3e4e095bc 100644
--- a/src/Interpreters/addMissingDefaults.cpp
+++ b/src/Interpreters/addMissingDefaults.cpp
@@ -19,7 +19,7 @@ ActionsDAGPtr addMissingDefaults(
     const Block & header,
     const NamesAndTypesList & required_columns,
     const ColumnsDescription & columns,
-    const Context & context)
+    ContextPtr context)
 {
     auto actions = std::make_shared<ActionsDAG>(header.getColumnsWithTypeAndName());
     auto & index = actions->getIndex();
diff --git a/src/Interpreters/addMissingDefaults.h b/src/Interpreters/addMissingDefaults.h
index e746c7cc9e6..90376c41216 100644
--- a/src/Interpreters/addMissingDefaults.h
+++ b/src/Interpreters/addMissingDefaults.h
@@ -1,15 +1,16 @@
 #pragma once
 
-#include <unordered_map>
-#include <string>
+#include <Interpreters/Context_fwd.h>
+
 #include <memory>
+#include <string>
+#include <unordered_map>
 
 
 namespace DB
 {
 
 class Block;
-class Context;
 class NamesAndTypesList;
 class ColumnsDescription;
 
@@ -23,9 +24,5 @@ using ActionsDAGPtr = std::shared_ptr<ActionsDAG>;
   * All three types of columns are materialized (not constants).
   */
 ActionsDAGPtr addMissingDefaults(
-    const Block & header,
-    const NamesAndTypesList & required_columns,
-    const ColumnsDescription & columns,
-    const Context & context);
-
+    const Block & header, const NamesAndTypesList & required_columns, const ColumnsDescription & columns, ContextPtr context);
 }
diff --git a/src/Interpreters/addTypeConversionToAST.cpp b/src/Interpreters/addTypeConversionToAST.cpp
index 18591fd732c..73c95bd9a8c 100644
--- a/src/Interpreters/addTypeConversionToAST.cpp
+++ b/src/Interpreters/addTypeConversionToAST.cpp
@@ -32,7 +32,7 @@ ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name)
     return func;
 }
 
-ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name, const NamesAndTypesList & all_columns, const Context & context)
+ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name, const NamesAndTypesList & all_columns, ContextPtr context)
 {
     auto syntax_analyzer_result = TreeRewriter(context).analyze(ast, all_columns);
     const auto actions = ExpressionAnalyzer(ast, syntax_analyzer_result, context).getActions(true);
diff --git a/src/Interpreters/addTypeConversionToAST.h b/src/Interpreters/addTypeConversionToAST.h
index 16fa98f6e0c..eb391b2c749 100644
--- a/src/Interpreters/addTypeConversionToAST.h
+++ b/src/Interpreters/addTypeConversionToAST.h
@@ -1,17 +1,19 @@
 #pragma once
 
-#include <common/types.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
+#include <common/types.h>
 
 
 namespace DB
 {
-class Context;
+
 class NamesAndTypesList;
+
 /// It will produce an expression with CAST to get an AST with the required type.
 ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name);
 
 // If same type, then ignore the wrapper of CAST function
-ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name, const NamesAndTypesList & all_columns, const Context & context);
+ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name, const NamesAndTypesList & all_columns, ContextPtr context);
 
 }
diff --git a/src/Interpreters/evaluateConstantExpression.cpp b/src/Interpreters/evaluateConstantExpression.cpp
index a3301bcf55b..89924025c08 100644
--- a/src/Interpreters/evaluateConstantExpression.cpp
+++ b/src/Interpreters/evaluateConstantExpression.cpp
@@ -30,14 +30,14 @@ namespace ErrorCodes
 }
 
 
-std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(const ASTPtr & node, const Context & context)
+std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(const ASTPtr & node, ContextPtr context)
 {
     NamesAndTypesList source_columns = {{ "_dummy", std::make_shared<DataTypeUInt8>() }};
     auto ast = node->clone();
-    ReplaceQueryParameterVisitor param_visitor(context.getQueryParameters());
+    ReplaceQueryParameterVisitor param_visitor(context->getQueryParameters());
     param_visitor.visit(ast);
 
-    if (context.getSettingsRef().normalize_function_names)
+    if (context->getSettingsRef().normalize_function_names)
         FunctionNameNormalizer().visit(ast.get());
 
     String name = ast->getColumnName();
@@ -66,7 +66,7 @@ std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(co
 }
 
 
-ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, const Context & context)
+ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, ContextPtr context)
 {
     /// If it's already a literal.
     if (node->as<ASTLiteral>())
@@ -74,7 +74,7 @@ ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, const Context &
     return std::make_shared<ASTLiteral>(evaluateConstantExpression(node, context).first);
 }
 
-ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, const Context & context)
+ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, ContextPtr context)
 {
     if (const auto * id = node->as<ASTIdentifier>())
         return std::make_shared<ASTLiteral>(id->name());
@@ -82,18 +82,18 @@ ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, cons
     return evaluateConstantExpressionAsLiteral(node, context);
 }
 
-ASTPtr evaluateConstantExpressionForDatabaseName(const ASTPtr & node, const Context & context)
+ASTPtr evaluateConstantExpressionForDatabaseName(const ASTPtr & node, ContextPtr context)
 {
     ASTPtr res = evaluateConstantExpressionOrIdentifierAsLiteral(node, context);
     auto & literal = res->as<ASTLiteral &>();
     if (literal.value.safeGet<String>().empty())
     {
-        String current_database = context.getCurrentDatabase();
+        String current_database = context->getCurrentDatabase();
         if (current_database.empty())
         {
             /// Table was created on older version of ClickHouse and CREATE contains not folded expression.
             /// Current database is not set yet during server startup, so we cannot evaluate it correctly.
-            literal.value = context.getConfigRef().getString("default_database", "default");
+            literal.value = context->getConfigRef().getString("default_database", "default");
         }
         else
             literal.value = current_database;
diff --git a/src/Interpreters/evaluateConstantExpression.h b/src/Interpreters/evaluateConstantExpression.h
index c797b8461de..b95982f5b99 100644
--- a/src/Interpreters/evaluateConstantExpression.h
+++ b/src/Interpreters/evaluateConstantExpression.h
@@ -2,6 +2,7 @@
 
 #include <Core/Block.h>
 #include <Core/Field.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST.h>
 #include <Parsers/IParser.h>
 
@@ -12,7 +13,6 @@
 namespace DB
 {
 
-class Context;
 class ExpressionActions;
 class IDataType;
 
@@ -23,25 +23,25 @@ using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
   * Throws exception if it's not a constant expression.
   * Quite suboptimal.
   */
-std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(const ASTPtr & node, const Context & context);
+std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(const ASTPtr & node, ContextPtr context);
 
 
 /** Evaluate constant expression and returns ASTLiteral with its value.
   */
-ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, const Context & context);
+ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, ContextPtr context);
 
 
 /** Evaluate constant expression and returns ASTLiteral with its value.
   * Also, if AST is identifier, then return string literal with its name.
   * Useful in places where some name may be specified as identifier, or as result of a constant expression.
   */
-ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, const Context & context);
+ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, ContextPtr context);
 
 /** The same as evaluateConstantExpressionOrIdentifierAsLiteral(...),
  *  but if result is an empty string, replace it with current database name
  *  or default database name.
  */
-ASTPtr evaluateConstantExpressionForDatabaseName(const ASTPtr & node, const Context & context);
+ASTPtr evaluateConstantExpressionForDatabaseName(const ASTPtr & node, ContextPtr context);
 
 /** Try to fold condition to countable set of constant values.
   * @param node a condition that we try to fold.
diff --git a/src/Interpreters/executeDDLQueryOnCluster.cpp b/src/Interpreters/executeDDLQueryOnCluster.cpp
index d4e8d06e613..99ece6bb14c 100644
--- a/src/Interpreters/executeDDLQueryOnCluster.cpp
+++ b/src/Interpreters/executeDDLQueryOnCluster.cpp
@@ -48,17 +48,17 @@ bool isSupportedAlterType(int type)
 }
 
 
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & context)
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, ContextPtr context)
 {
     return executeDDLQueryOnCluster(query_ptr_, context, {});
 }
 
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, const Context & context, const AccessRightsElements & query_requires_access)
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, ContextPtr context, const AccessRightsElements & query_requires_access)
 {
     return executeDDLQueryOnCluster(query_ptr, context, AccessRightsElements{query_requires_access});
 }
 
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & context, AccessRightsElements && query_requires_access)
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, ContextPtr context, AccessRightsElements && query_requires_access)
 {
     /// Remove FORMAT <fmt> and INTO OUTFILE <file> if exists
     ASTPtr query_ptr = query_ptr_->clone();
@@ -71,7 +71,7 @@ BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & cont
         throw Exception("Distributed execution is not supported for such DDL queries", ErrorCodes::NOT_IMPLEMENTED);
     }
 
-    if (!context.getSettingsRef().allow_distributed_ddl)
+    if (!context->getSettingsRef().allow_distributed_ddl)
         throw Exception("Distributed DDL queries are prohibited for the user", ErrorCodes::QUERY_IS_PROHIBITED);
 
     if (const auto * query_alter = query_ptr->as<ASTAlterQuery>())
@@ -83,9 +83,9 @@ BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & cont
         }
     }
 
-    query->cluster = context.getMacros()->expand(query->cluster);
-    ClusterPtr cluster = context.getCluster(query->cluster);
-    DDLWorker & ddl_worker = context.getDDLWorker();
+    query->cluster = context->getMacros()->expand(query->cluster);
+    ClusterPtr cluster = context->getCluster(query->cluster);
+    DDLWorker & ddl_worker = context->getDDLWorker();
 
     /// Enumerate hosts which will be used to send query.
     Cluster::AddressesWithFailover shards = cluster->getShardsAddresses();
@@ -109,7 +109,7 @@ BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & cont
            != query_requires_access.end());
 
     bool use_local_default_database = false;
-    const String & current_database = context.getCurrentDatabase();
+    const String & current_database = context->getCurrentDatabase();
 
     if (need_replace_current_database)
     {
@@ -157,7 +157,7 @@ BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & cont
     visitor.visitDDL(query_ptr);
 
     /// Check access rights, assume that all servers have the same users config
-    context.checkAccess(query_requires_access);
+    context->checkAccess(query_requires_access);
 
     DDLLogEntry entry;
     entry.hosts = std::move(hosts);
@@ -169,14 +169,14 @@ BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr_, const Context & cont
     return getDistributedDDLStatus(node_path, entry, context);
 }
 
-BlockIO getDistributedDDLStatus(const String & node_path, const DDLLogEntry & entry, const Context & context, const std::optional<Strings> & hosts_to_wait)
+BlockIO getDistributedDDLStatus(const String & node_path, const DDLLogEntry & entry, ContextPtr context, const std::optional<Strings> & hosts_to_wait)
 {
     BlockIO io;
-    if (context.getSettingsRef().distributed_ddl_task_timeout == 0)
+    if (context->getSettingsRef().distributed_ddl_task_timeout == 0)
         return io;
 
     auto stream = std::make_shared<DDLQueryStatusInputStream>(node_path, entry, context, hosts_to_wait);
-    if (context.getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NONE)
+    if (context->getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NONE)
     {
         /// Wait for query to finish, but ignore output
         NullBlockOutputStream output{Block{}};
@@ -189,18 +189,18 @@ BlockIO getDistributedDDLStatus(const String & node_path, const DDLLogEntry & en
     return io;
 }
 
-DDLQueryStatusInputStream::DDLQueryStatusInputStream(const String & zk_node_path, const DDLLogEntry & entry, const Context & context_,
+DDLQueryStatusInputStream::DDLQueryStatusInputStream(const String & zk_node_path, const DDLLogEntry & entry, ContextPtr context_,
                                                      const std::optional<Strings> & hosts_to_wait)
     : node_path(zk_node_path)
     , context(context_)
     , watch(CLOCK_MONOTONIC_COARSE)
     , log(&Poco::Logger::get("DDLQueryStatusInputStream"))
 {
-    if (context.getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::THROW ||
-        context.getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NONE)
+    if (context->getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::THROW ||
+        context->getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NONE)
         throw_on_timeout = true;
-    else if (context.getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NULL_STATUS_ON_TIMEOUT ||
-             context.getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NEVER_THROW)
+    else if (context->getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NULL_STATUS_ON_TIMEOUT ||
+             context->getSettingsRef().distributed_ddl_output_mode == DistributedDDLOutputMode::NEVER_THROW)
         throw_on_timeout = false;
     else
         throw Exception(ErrorCodes::LOGICAL_ERROR, "Unknown output mode");
@@ -235,7 +235,7 @@ DDLQueryStatusInputStream::DDLQueryStatusInputStream(const String & zk_node_path
 
     addTotalRowsApprox(waiting_hosts.size());
 
-    timeout_seconds = context.getSettingsRef().distributed_ddl_task_timeout;
+    timeout_seconds = context->getSettingsRef().distributed_ddl_task_timeout;
 }
 
 std::pair<String, UInt16> DDLQueryStatusInputStream::parseHostAndPort(const String & host_id) const
@@ -259,21 +259,21 @@ Block DDLQueryStatusInputStream::readImpl()
     assert(num_hosts_finished <= waiting_hosts.size());
     if (all_hosts_finished || timeout_exceeded)
     {
-        bool throw_if_error_on_host = context.getSettingsRef().distributed_ddl_output_mode != DistributedDDLOutputMode::NEVER_THROW;
+        bool throw_if_error_on_host = context->getSettingsRef().distributed_ddl_output_mode != DistributedDDLOutputMode::NEVER_THROW;
         if (first_exception && throw_if_error_on_host)
             throw Exception(*first_exception);
 
         return res;
     }
 
-    auto zookeeper = context.getZooKeeper();
+    auto zookeeper = context->getZooKeeper();
     size_t try_number = 0;
 
     while (res.rows() == 0)
     {
         if (isCancelled())
         {
-            bool throw_if_error_on_host = context.getSettingsRef().distributed_ddl_output_mode != DistributedDDLOutputMode::NEVER_THROW;
+            bool throw_if_error_on_host = context->getSettingsRef().distributed_ddl_output_mode != DistributedDDLOutputMode::NEVER_THROW;
             if (first_exception && throw_if_error_on_host)
                 throw Exception(*first_exception);
 
diff --git a/src/Interpreters/executeDDLQueryOnCluster.h b/src/Interpreters/executeDDLQueryOnCluster.h
index a33b89d0cb3..bbd39a6e8ec 100644
--- a/src/Interpreters/executeDDLQueryOnCluster.h
+++ b/src/Interpreters/executeDDLQueryOnCluster.h
@@ -1,5 +1,7 @@
 #pragma once
+
 #include <DataStreams/BlockIO.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
 
 namespace zkutil
@@ -10,7 +12,6 @@ namespace zkutil
 namespace DB
 {
 
-class Context;
 class AccessRightsElements;
 struct DDLLogEntry;
 
@@ -20,16 +21,16 @@ bool isSupportedAlterType(int type);
 
 /// Pushes distributed DDL query to the queue.
 /// Returns DDLQueryStatusInputStream, which reads results of query execution on each host in the cluster.
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, const Context & context);
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, const Context & context, const AccessRightsElements & query_requires_access);
-BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, const Context & context, AccessRightsElements && query_requires_access);
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, ContextPtr context);
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, ContextPtr context, const AccessRightsElements & query_requires_access);
+BlockIO executeDDLQueryOnCluster(const ASTPtr & query_ptr, ContextPtr context, AccessRightsElements && query_requires_access);
 
-BlockIO getDistributedDDLStatus(const String & node_path, const DDLLogEntry & entry, const Context & context, const std::optional<Strings> & hosts_to_wait = {});
+BlockIO getDistributedDDLStatus(const String & node_path, const DDLLogEntry & entry, ContextPtr context, const std::optional<Strings> & hosts_to_wait = {});
 
 class DDLQueryStatusInputStream final : public IBlockInputStream
 {
 public:
-    DDLQueryStatusInputStream(const String & zk_node_path, const DDLLogEntry & entry, const Context & context_, const std::optional<Strings> & hosts_to_wait = {});
+    DDLQueryStatusInputStream(const String & zk_node_path, const DDLLogEntry & entry, ContextPtr context_, const std::optional<Strings> & hosts_to_wait = {});
 
     String getName() const override { return "DDLQueryStatusInputStream"; }
 
@@ -48,7 +49,7 @@ private:
     std::pair<String, UInt16> parseHostAndPort(const String & host_id) const;
 
     String node_path;
-    const Context & context;
+    ContextPtr context;
     Stopwatch watch;
     Poco::Logger * log;
 
diff --git a/src/Interpreters/executeQuery.cpp b/src/Interpreters/executeQuery.cpp
index a5c21405ff1..5df245f9f26 100644
--- a/src/Interpreters/executeQuery.cpp
+++ b/src/Interpreters/executeQuery.cpp
@@ -121,7 +121,7 @@ static String joinLines(const String & query)
 }
 
 
-static String prepareQueryForLogging(const String & query, Context & context)
+static String prepareQueryForLogging(const String & query, ContextPtr context)
 {
     String res = query;
 
@@ -136,14 +136,14 @@ static String prepareQueryForLogging(const String & query, Context & context)
         }
     }
 
-    res = res.substr(0, context.getSettingsRef().log_queries_cut_to_length);
+    res = res.substr(0, context->getSettingsRef().log_queries_cut_to_length);
 
     return res;
 }
 
 
 /// Log query into text log (not into system table).
-static void logQuery(const String & query, const Context & context, bool internal)
+static void logQuery(const String & query, ContextPtr context, bool internal)
 {
     if (internal)
     {
@@ -151,14 +151,14 @@ static void logQuery(const String & query, const Context & context, bool interna
     }
     else
     {
-        const auto & client_info = context.getClientInfo();
+        const auto & client_info = context->getClientInfo();
 
         const auto & current_query_id = client_info.current_query_id;
         const auto & initial_query_id = client_info.initial_query_id;
         const auto & current_user = client_info.current_user;
 
-        String comment = context.getSettingsRef().log_comment;
-        size_t max_query_size = context.getSettingsRef().max_query_size;
+        String comment = context->getSettingsRef().log_comment;
+        size_t max_query_size = context->getSettingsRef().max_query_size;
 
         if (comment.size() > max_query_size)
             comment.resize(max_query_size);
@@ -170,7 +170,7 @@ static void logQuery(const String & query, const Context & context, bool interna
             client_info.current_address.toString(),
             (current_user != "default" ? ", user: " + current_user : ""),
             (!initial_query_id.empty() && current_query_id != initial_query_id ? ", initial_query_id: " + initial_query_id : std::string()),
-            (context.getSettingsRef().use_antlr_parser ? "experimental" : "production"),
+            (context->getSettingsRef().use_antlr_parser ? "experimental" : "production"),
             comment,
             joinLines(query));
 
@@ -204,19 +204,30 @@ static void setExceptionStackTrace(QueryLogElement & elem)
 
 
 /// Log exception (with query info) into text log (not into system table).
-static void logException(Context & context, QueryLogElement & elem)
+static void logException(ContextPtr context, QueryLogElement & elem)
 {
     String comment;
     if (!elem.log_comment.empty())
         comment = fmt::format(" (comment: {})", elem.log_comment);
 
     if (elem.stack_trace.empty())
-        LOG_ERROR(&Poco::Logger::get("executeQuery"), "{} (from {}){} (in query: {})",
-            elem.exception, context.getClientInfo().current_address.toString(), comment, joinLines(elem.query));
+        LOG_ERROR(
+            &Poco::Logger::get("executeQuery"),
+            "{} (from {}){} (in query: {})",
+            elem.exception,
+            context->getClientInfo().current_address.toString(),
+            comment,
+            joinLines(elem.query));
     else
-        LOG_ERROR(&Poco::Logger::get("executeQuery"), "{} (from {}){} (in query: {})"
+        LOG_ERROR(
+            &Poco::Logger::get("executeQuery"),
+            "{} (from {}){} (in query: {})"
             ", Stack trace (when copying this message, always include the lines below):\n\n{}",
-            elem.exception, context.getClientInfo().current_address.toString(), comment, joinLines(elem.query), elem.stack_trace);
+            elem.exception,
+            context->getClientInfo().current_address.toString(),
+            comment,
+            joinLines(elem.query),
+            elem.stack_trace);
 }
 
 inline UInt64 time_in_microseconds(std::chrono::time_point<std::chrono::system_clock> timepoint)
@@ -230,13 +241,13 @@ inline UInt64 time_in_seconds(std::chrono::time_point<std::chrono::system_clock>
     return std::chrono::duration_cast<std::chrono::seconds>(timepoint.time_since_epoch()).count();
 }
 
-static void onExceptionBeforeStart(const String & query_for_logging, Context & context, UInt64 current_time_us, ASTPtr ast)
+static void onExceptionBeforeStart(const String & query_for_logging, ContextPtr context, UInt64 current_time_us, ASTPtr ast)
 {
     /// Exception before the query execution.
-    if (auto quota = context.getQuota())
+    if (auto quota = context->getQuota())
         quota->used(Quota::ERRORS, 1, /* check_exceeded = */ false);
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     /// Log the start of query execution into the table if necessary.
     QueryLogElement elem;
@@ -251,7 +262,7 @@ static void onExceptionBeforeStart(const String & query_for_logging, Context & c
     elem.query_start_time = current_time_us / 1000000;
     elem.query_start_time_microseconds = current_time_us;
 
-    elem.current_database = context.getCurrentDatabase();
+    elem.current_database = context->getCurrentDatabase();
     elem.query = query_for_logging;
     elem.normalized_query_hash = normalizedQueryHash<false>(query_for_logging);
 
@@ -260,7 +271,7 @@ static void onExceptionBeforeStart(const String & query_for_logging, Context & c
     elem.exception_code = getCurrentExceptionCode();
     elem.exception = getCurrentExceptionMessage(false);
 
-    elem.client_info = context.getClientInfo();
+    elem.client_info = context->getClientInfo();
 
     elem.log_comment = settings.log_comment;
     if (elem.log_comment.size() > settings.max_query_size)
@@ -274,17 +285,17 @@ static void onExceptionBeforeStart(const String & query_for_logging, Context & c
     CurrentThread::finalizePerformanceCounters();
 
     if (settings.log_queries && elem.type >= settings.log_queries_min_type && !settings.log_queries_min_query_duration_ms.totalMilliseconds())
-        if (auto query_log = context.getQueryLog())
+        if (auto query_log = context->getQueryLog())
             query_log->add(elem);
 
-    if (auto opentelemetry_span_log = context.getOpenTelemetrySpanLog();
-        context.query_trace_context.trace_id
+    if (auto opentelemetry_span_log = context->getOpenTelemetrySpanLog();
+        context->query_trace_context.trace_id
             && opentelemetry_span_log)
     {
         OpenTelemetrySpanLogElement span;
-        span.trace_id = context.query_trace_context.trace_id;
-        span.span_id = context.query_trace_context.span_id;
-        span.parent_span_id = context.getClientInfo().client_trace_context.span_id;
+        span.trace_id = context->query_trace_context.trace_id;
+        span.span_id = context->query_trace_context.span_id;
+        span.parent_span_id = context->getClientInfo().client_trace_context.span_id;
         span.operation_name = "query";
         span.start_time_us = current_time_us;
         span.finish_time_us = current_time_us;
@@ -299,11 +310,11 @@ static void onExceptionBeforeStart(const String & query_for_logging, Context & c
         span.attribute_names.push_back("clickhouse.query_id");
         span.attribute_values.push_back(elem.client_info.current_query_id);
 
-        if (!context.query_trace_context.tracestate.empty())
+        if (!context->query_trace_context.tracestate.empty())
         {
             span.attribute_names.push_back("clickhouse.tracestate");
             span.attribute_values.push_back(
-                context.query_trace_context.tracestate);
+                context->query_trace_context.tracestate);
         }
 
         opentelemetry_span_log->add(span);
@@ -324,19 +335,19 @@ static void onExceptionBeforeStart(const String & query_for_logging, Context & c
     }
 }
 
-static void setQuerySpecificSettings(ASTPtr & ast, Context & context)
+static void setQuerySpecificSettings(ASTPtr & ast, ContextPtr context)
 {
     if (auto * ast_insert_into = dynamic_cast<ASTInsertQuery *>(ast.get()))
     {
         if (ast_insert_into->watch)
-            context.setSetting("output_format_enable_streaming", 1);
+            context->setSetting("output_format_enable_streaming", 1);
     }
 }
 
 static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
     const char * begin,
     const char * end,
-    Context & context,
+    ContextPtr context,
     bool internal,
     QueryProcessingStage::Enum stage,
     bool has_query_tail,
@@ -349,7 +360,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
     assert(internal || CurrentThread::get().getQueryContext()->getCurrentQueryId() == CurrentThread::getQueryId());
 #endif
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     ASTPtr ast;
     const char * query_end;
@@ -365,7 +376,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
 #if !defined(ARCADIA_BUILD)
         if (settings.use_antlr_parser)
         {
-            ast = parseQuery(begin, end, max_query_size, settings.max_parser_depth, context.getCurrentDatabase());
+            ast = parseQuery(begin, end, max_query_size, settings.max_parser_depth, context->getCurrentDatabase());
         }
         else
         {
@@ -456,9 +467,9 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
     try
     {
         /// Replace ASTQueryParameter with ASTLiteral for prepared statements.
-        if (context.hasQueryParameters())
+        if (context->hasQueryParameters())
         {
-            ReplaceQueryParameterVisitor visitor(context.getQueryParameters());
+            ReplaceQueryParameterVisitor visitor(context->getQueryParameters());
             visitor.visit(ast);
             query = serializeAST(*ast);
         }
@@ -476,7 +487,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
         }
 
         /// Normalize SelectWithUnionQuery
-        NormalizeSelectWithUnionQueryVisitor::Data data{context.getSettingsRef().union_default_mode};
+        NormalizeSelectWithUnionQueryVisitor::Data data{context->getSettingsRef().union_default_mode};
         NormalizeSelectWithUnionQueryVisitor{data}.visit(ast);
 
         /// Check the limits.
@@ -487,12 +498,12 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
         if (!internal && !ast->as<ASTShowProcesslistQuery>())
         {
             /// processlist also has query masked now, to avoid secrets leaks though SHOW PROCESSLIST by other users.
-            process_list_entry = context.getProcessList().insert(query_for_logging, ast.get(), context);
-            context.setProcessListElement(&process_list_entry->get());
+            process_list_entry = context->getProcessList().insert(query_for_logging, ast.get(), context);
+            context->setProcessListElement(&process_list_entry->get());
         }
 
         /// Load external tables if they were provided
-        context.initializeExternalTablesIfSet();
+        context->initializeExternalTablesIfSet();
 
         auto * insert_query = ast->as<ASTInsertQuery>();
         if (insert_query && insert_query->select)
@@ -504,7 +515,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 insert_query->tryFindInputFunction(input_function);
                 if (input_function)
                 {
-                    StoragePtr storage = context.executeTableFunction(input_function);
+                    StoragePtr storage = context->executeTableFunction(input_function);
                     auto & input_storage = dynamic_cast<StorageInput &>(*storage);
                     auto input_metadata_snapshot = input_storage.getInMemoryMetadataPtr();
                     BlockInputStreamPtr input_stream = std::make_shared<InputStreamFromASTInsertQuery>(
@@ -515,14 +526,14 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
         }
         else
             /// reset Input callbacks if query is not INSERT SELECT
-            context.resetInputCallbacks();
+            context->resetInputCallbacks();
 
         auto interpreter = InterpreterFactory::get(ast, context, SelectQueryOptions(stage).setInternal(internal));
 
         std::shared_ptr<const EnabledQuota> quota;
         if (!interpreter->ignoreQuota())
         {
-            quota = context.getQuota();
+            quota = context->getQuota();
             if (quota)
             {
                 if (ast->as<ASTSelectQuery>() || ast->as<ASTSelectWithUnionQuery>())
@@ -558,7 +569,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             /// Save insertion table (not table function). TODO: support remote() table function.
             auto table_id = insert_interpreter->getDatabaseTable();
             if (!table_id.empty())
-                context.setInsertionTable(std::move(table_id));
+                context->setInsertionTable(std::move(table_id));
         }
 
         if (process_list_entry)
@@ -578,8 +589,8 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
         {
             /// Limits on the result, the quota on the result, and also callback for progress.
             /// Limits apply only to the final result.
-            pipeline.setProgressCallback(context.getProgressCallback());
-            pipeline.setProcessListElement(context.getProcessListElement());
+            pipeline.setProgressCallback(context->getProgressCallback());
+            pipeline.setProcessListElement(context->getProcessListElement());
             if (stage == QueryProcessingStage::Complete && !pipeline.isCompleted())
             {
                 pipeline.resize(1);
@@ -597,8 +608,8 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             /// Limits apply only to the final result.
             if (res.in)
             {
-                res.in->setProgressCallback(context.getProgressCallback());
-                res.in->setProcessListElement(context.getProcessListElement());
+                res.in->setProgressCallback(context->getProgressCallback());
+                res.in->setProcessListElement(context->getProcessListElement());
                 if (stage == QueryProcessingStage::Complete)
                 {
                     if (!interpreter->ignoreQuota())
@@ -612,7 +623,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             {
                 if (auto * stream = dynamic_cast<CountingBlockOutputStream *>(res.out.get()))
                 {
-                    stream->setProcessListElement(context.getProcessListElement());
+                    stream->setProcessListElement(context->getProcessListElement());
                 }
             }
         }
@@ -628,11 +639,11 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             elem.query_start_time = time_in_seconds(current_time);
             elem.query_start_time_microseconds = time_in_microseconds(current_time);
 
-            elem.current_database = context.getCurrentDatabase();
+            elem.current_database = context->getCurrentDatabase();
             elem.query = query_for_logging;
             elem.normalized_query_hash = normalizedQueryHash<false>(query_for_logging);
 
-            elem.client_info = context.getClientInfo();
+            elem.client_info = context->getClientInfo();
 
             bool log_queries = settings.log_queries && !internal;
 
@@ -641,7 +652,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             {
                 if (use_processors)
                 {
-                    const auto & info = context.getQueryAccessInfo();
+                    const auto & info = context->getQueryAccessInfo();
                     elem.query_databases = info.databases;
                     elem.query_tables = info.tables;
                     elem.query_columns = info.columns;
@@ -650,7 +661,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 interpreter->extendQueryLogElem(elem, ast, context, query_database, query_table);
 
                 if (settings.log_query_settings)
-                    elem.query_settings = std::make_shared<Settings>(context.getSettingsRef());
+                    elem.query_settings = std::make_shared<Settings>(context->getSettingsRef());
 
                 elem.log_comment = settings.log_comment;
                 if (elem.log_comment.size() > settings.max_query_size)
@@ -658,7 +669,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
 
                 if (elem.type >= settings.log_queries_min_type && !settings.log_queries_min_query_duration_ms.totalMilliseconds())
                 {
-                    if (auto query_log = context.getQueryLog())
+                    if (auto query_log = context->getQueryLog())
                         query_log->add(elem);
                 }
             }
@@ -692,7 +703,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             };
 
             /// Also make possible for caller to log successful query finish and exception during execution.
-            auto finish_callback = [elem, &context, ast,
+            auto finish_callback = [elem, context, ast,
                  log_queries,
                  log_queries_min_type = settings.log_queries_min_type,
                  log_queries_min_query_duration_ms = settings.log_queries_min_query_duration_ms.totalMilliseconds(),
@@ -700,7 +711,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
             ]
                 (IBlockInputStream * stream_in, IBlockOutputStream * stream_out, QueryPipeline * query_pipeline) mutable
             {
-                QueryStatus * process_list_elem = context.getProcessListElement();
+                QueryStatus * process_list_elem = context->getProcessListElement();
 
                 if (!process_list_elem)
                     return;
@@ -708,7 +719,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 /// Update performance counters before logging to query_log
                 CurrentThread::finalizePerformanceCounters();
 
-                QueryStatusInfo info = process_list_elem->getInfo(true, context.getSettingsRef().log_profile_events);
+                QueryStatusInfo info = process_list_elem->getInfo(true, context->getSettingsRef().log_profile_events);
 
                 double elapsed_seconds = info.elapsed_seconds;
 
@@ -721,7 +732,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 elem.event_time_microseconds = time_in_microseconds(finish_time);
                 status_info_to_query_log(elem, info, ast);
 
-                auto progress_callback = context.getProgressCallback();
+                auto progress_callback = context->getProgressCallback();
 
                 if (progress_callback)
                     progress_callback(Progress(WriteProgress(info.written_rows, info.written_bytes)));
@@ -763,7 +774,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 elem.thread_ids = std::move(info.thread_ids);
                 elem.profile_counters = std::move(info.profile_counters);
 
-                const auto & factories_info = context.getQueryFactoriesInfo();
+                const auto & factories_info = context->getQueryFactoriesInfo();
                 elem.used_aggregate_functions = factories_info.aggregate_functions;
                 elem.used_aggregate_function_combinators = factories_info.aggregate_function_combinators;
                 elem.used_database_engines = factories_info.database_engines;
@@ -776,18 +787,18 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
 
                 if (log_queries && elem.type >= log_queries_min_type && Int64(elem.query_duration_ms) >= log_queries_min_query_duration_ms)
                 {
-                    if (auto query_log = context.getQueryLog())
+                    if (auto query_log = context->getQueryLog())
                         query_log->add(elem);
                 }
 
-                if (auto opentelemetry_span_log = context.getOpenTelemetrySpanLog();
-                    context.query_trace_context.trace_id
+                if (auto opentelemetry_span_log = context->getOpenTelemetrySpanLog();
+                    context->query_trace_context.trace_id
                         && opentelemetry_span_log)
                 {
                     OpenTelemetrySpanLogElement span;
-                    span.trace_id = context.query_trace_context.trace_id;
-                    span.span_id = context.query_trace_context.span_id;
-                    span.parent_span_id = context.getClientInfo().client_trace_context.span_id;
+                    span.trace_id = context->query_trace_context.trace_id;
+                    span.span_id = context->query_trace_context.span_id;
+                    span.parent_span_id = context->getClientInfo().client_trace_context.span_id;
                     span.operation_name = "query";
                     span.start_time_us = elem.query_start_time_microseconds;
                     span.finish_time_us = time_in_microseconds(finish_time);
@@ -801,18 +812,18 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
 
                     span.attribute_names.push_back("clickhouse.query_id");
                     span.attribute_values.push_back(elem.client_info.current_query_id);
-                    if (!context.query_trace_context.tracestate.empty())
+                    if (!context->query_trace_context.tracestate.empty())
                     {
                         span.attribute_names.push_back("clickhouse.tracestate");
                         span.attribute_values.push_back(
-                            context.query_trace_context.tracestate);
+                            context->query_trace_context.tracestate);
                     }
 
                     opentelemetry_span_log->add(span);
                 }
             };
 
-            auto exception_callback = [elem, &context, ast,
+            auto exception_callback = [elem, context, ast,
                  log_queries,
                  log_queries_min_type = settings.log_queries_min_type,
                  log_queries_min_query_duration_ms = settings.log_queries_min_query_duration_ms.totalMilliseconds(),
@@ -833,8 +844,8 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 elem.exception_code = getCurrentExceptionCode();
                 elem.exception = getCurrentExceptionMessage(false);
 
-                QueryStatus * process_list_elem = context.getProcessListElement();
-                const Settings & current_settings = context.getSettingsRef();
+                QueryStatus * process_list_elem = context->getProcessListElement();
+                const Settings & current_settings = context->getSettingsRef();
 
                 /// Update performance counters before logging to query_log
                 CurrentThread::finalizePerformanceCounters();
@@ -852,7 +863,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                 /// In case of exception we log internal queries also
                 if (log_queries && elem.type >= log_queries_min_type && Int64(elem.query_duration_ms) >= log_queries_min_query_duration_ms)
                 {
-                    if (auto query_log = context.getQueryLog())
+                    if (auto query_log = context->getQueryLog())
                         query_log->add(elem);
                 }
 
@@ -898,7 +909,7 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
 
 BlockIO executeQuery(
     const String & query,
-    Context & context,
+    ContextPtr context,
     bool internal,
     QueryProcessingStage::Enum stage,
     bool may_have_embedded_data)
@@ -912,7 +923,7 @@ BlockIO executeQuery(
     {
         String format_name = ast_query_with_output->format
                 ? getIdentifierName(ast_query_with_output->format)
-                : context.getDefaultFormat();
+                : context->getDefaultFormat();
 
         if (format_name == "Null")
             streams.null_format = true;
@@ -923,7 +934,7 @@ BlockIO executeQuery(
 
 BlockIO executeQuery(
     const String & query,
-    Context & context,
+    ContextPtr context,
     bool internal,
     QueryProcessingStage::Enum stage,
     bool may_have_embedded_data,
@@ -942,7 +953,7 @@ void executeQuery(
     ReadBuffer & istr,
     WriteBuffer & ostr,
     bool allow_into_outfile,
-    Context & context,
+    ContextPtr context,
     std::function<void(const String &, const String &, const String &, const String &)> set_result_details)
 {
     PODArray<char> parse_buf;
@@ -953,7 +964,7 @@ void executeQuery(
     if (!istr.hasPendingData())
         istr.next();
 
-    size_t max_query_size = context.getSettingsRef().max_query_size;
+    size_t max_query_size = context->getSettingsRef().max_query_size;
 
     bool may_have_tail;
     if (istr.buffer().end() - istr.position() > static_cast<ssize_t>(max_query_size))
@@ -1012,12 +1023,12 @@ void executeQuery(
 
             String format_name = ast_query_with_output && (ast_query_with_output->format != nullptr)
                 ? getIdentifierName(ast_query_with_output->format)
-                : context.getDefaultFormat();
+                : context->getDefaultFormat();
 
-            auto out = context.getOutputStreamParallelIfPossible(format_name, *out_buf, streams.in->getHeader());
+            auto out = context->getOutputStreamParallelIfPossible(format_name, *out_buf, streams.in->getHeader());
 
             /// Save previous progress callback if any. TODO Do it more conveniently.
-            auto previous_progress_callback = context.getProgressCallback();
+            auto previous_progress_callback = context->getProgressCallback();
 
             /// NOTE Progress callback takes shared ownership of 'out'.
             streams.in->setProgressCallback([out, previous_progress_callback] (const Progress & progress)
@@ -1028,7 +1039,8 @@ void executeQuery(
             });
 
             if (set_result_details)
-                set_result_details(context.getClientInfo().current_query_id, out->getContentType(), format_name, DateLUT::instance().getTimeZone());
+                set_result_details(
+                    context->getClientInfo().current_query_id, out->getContentType(), format_name, DateLUT::instance().getTimeZone());
 
             copyData(*streams.in, *out, [](){ return false; }, [&out](const Block &) { out->flush(); });
         }
@@ -1050,7 +1062,7 @@ void executeQuery(
 
             String format_name = ast_query_with_output && (ast_query_with_output->format != nullptr)
                                  ? getIdentifierName(ast_query_with_output->format)
-                                 : context.getDefaultFormat();
+                                 : context->getDefaultFormat();
 
             if (!pipeline.isCompleted())
             {
@@ -1059,11 +1071,11 @@ void executeQuery(
                     return std::make_shared<MaterializingTransform>(header);
                 });
 
-                auto out = context.getOutputFormatParallelIfPossible(format_name, *out_buf, pipeline.getHeader());
+                auto out = context->getOutputFormatParallelIfPossible(format_name, *out_buf, pipeline.getHeader());
                 out->setAutoFlush();
 
                 /// Save previous progress callback if any. TODO Do it more conveniently.
-                auto previous_progress_callback = context.getProgressCallback();
+                auto previous_progress_callback = context->getProgressCallback();
 
                 /// NOTE Progress callback takes shared ownership of 'out'.
                 pipeline.setProgressCallback([out, previous_progress_callback] (const Progress & progress)
@@ -1074,13 +1086,14 @@ void executeQuery(
                 });
 
                 if (set_result_details)
-                    set_result_details(context.getClientInfo().current_query_id, out->getContentType(), format_name, DateLUT::instance().getTimeZone());
+                    set_result_details(
+                        context->getClientInfo().current_query_id, out->getContentType(), format_name, DateLUT::instance().getTimeZone());
 
                 pipeline.setOutputFormat(std::move(out));
             }
             else
             {
-                pipeline.setProgressCallback(context.getProgressCallback());
+                pipeline.setProgressCallback(context->getProgressCallback());
             }
 
             {
diff --git a/src/Interpreters/executeQuery.h b/src/Interpreters/executeQuery.h
index 2850bb3baf4..bdb1f877ce3 100644
--- a/src/Interpreters/executeQuery.h
+++ b/src/Interpreters/executeQuery.h
@@ -2,7 +2,6 @@
 
 #include <Core/QueryProcessingStage.h>
 #include <DataStreams/BlockIO.h>
-
 #include <Processors/QueryPipeline.h>
 
 namespace DB
@@ -10,7 +9,6 @@ namespace DB
 
 class ReadBuffer;
 class WriteBuffer;
-class Context;
 
 
 /// Parse and execute a query.
@@ -18,7 +16,7 @@ void executeQuery(
     ReadBuffer & istr,                  /// Where to read query from (and data for INSERT, if present).
     WriteBuffer & ostr,                 /// Where to write query output to.
     bool allow_into_outfile,            /// If true and the query contains INTO OUTFILE section, redirect output to that file.
-    Context & context,                  /// DB, tables, data types, storage engines, functions, aggregate functions...
+    ContextPtr context,                 /// DB, tables, data types, storage engines, functions, aggregate functions...
     std::function<void(const String &, const String &, const String &, const String &)> set_result_details /// If a non-empty callback is passed, it will be called with the query id, the content-type, the format, and the timezone.
 );
 
@@ -39,7 +37,7 @@ void executeQuery(
 /// must be done separately.
 BlockIO executeQuery(
     const String & query,     /// Query text without INSERT data. The latter must be written to BlockIO::out.
-    Context & context,        /// DB, tables, data types, storage engines, functions, aggregate functions...
+    ContextPtr context,       /// DB, tables, data types, storage engines, functions, aggregate functions...
     bool internal = false,    /// If true, this query is caused by another query and thus needn't be registered in the ProcessList.
     QueryProcessingStage::Enum stage = QueryProcessingStage::Complete,    /// To which stage the query must be executed.
     bool may_have_embedded_data = false /// If insert query may have embedded data
@@ -48,7 +46,7 @@ BlockIO executeQuery(
 /// Old interface with allow_processors flag. For compatibility.
 BlockIO executeQuery(
     const String & query,
-    Context & context,
+    ContextPtr context,
     bool internal,
     QueryProcessingStage::Enum stage,
     bool may_have_embedded_data,
diff --git a/src/Interpreters/getHeaderForProcessingStage.cpp b/src/Interpreters/getHeaderForProcessingStage.cpp
index 4de636007e0..9c7c86a0b88 100644
--- a/src/Interpreters/getHeaderForProcessingStage.cpp
+++ b/src/Interpreters/getHeaderForProcessingStage.cpp
@@ -40,7 +40,7 @@ Block getHeaderForProcessingStage(
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage)
 {
     switch (processed_stage)
diff --git a/src/Interpreters/getHeaderForProcessingStage.h b/src/Interpreters/getHeaderForProcessingStage.h
index e06d22f6b76..75a89bc5d39 100644
--- a/src/Interpreters/getHeaderForProcessingStage.h
+++ b/src/Interpreters/getHeaderForProcessingStage.h
@@ -1,7 +1,9 @@
 #pragma once
+
 #include <Core/Block.h>
 #include <Core/Names.h>
 #include <Core/QueryProcessingStage.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
@@ -11,7 +13,6 @@ class IStorage;
 struct StorageInMemoryMetadata;
 using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
 struct SelectQueryInfo;
-class Context;
 class ASTSelectQuery;
 
 bool hasJoin(const ASTSelectQuery & select);
@@ -22,7 +23,7 @@ Block getHeaderForProcessingStage(
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage);
 
 }
diff --git a/src/Interpreters/getTableExpressions.cpp b/src/Interpreters/getTableExpressions.cpp
index a4e971c302c..22eb307071c 100644
--- a/src/Interpreters/getTableExpressions.cpp
+++ b/src/Interpreters/getTableExpressions.cpp
@@ -75,7 +75,7 @@ ASTPtr extractTableExpression(const ASTSelectQuery & select, size_t table_number
 
 static NamesAndTypesList getColumnsFromTableExpression(
     const ASTTableExpression & table_expression,
-    const Context & context,
+    ContextPtr context,
     NamesAndTypesList & materialized,
     NamesAndTypesList & aliases,
     NamesAndTypesList & virtuals)
@@ -89,7 +89,7 @@ static NamesAndTypesList getColumnsFromTableExpression(
     else if (table_expression.table_function)
     {
         const auto table_function = table_expression.table_function;
-        auto * query_context = const_cast<Context *>(&context.getQueryContext());
+        auto query_context = context->getQueryContext();
         const auto & function_storage = query_context->executeTableFunction(table_function);
         auto function_metadata_snapshot = function_storage->getInMemoryMetadataPtr();
         const auto & columns = function_metadata_snapshot->getColumns();
@@ -100,7 +100,7 @@ static NamesAndTypesList getColumnsFromTableExpression(
     }
     else if (table_expression.database_and_table_name)
     {
-        auto table_id = context.resolveStorageID(table_expression.database_and_table_name);
+        auto table_id = context->resolveStorageID(table_expression.database_and_table_name);
         const auto & table = DatabaseCatalog::instance().getTable(table_id, context);
         auto table_metadata_snapshot = table->getInMemoryMetadataPtr();
         const auto & columns = table_metadata_snapshot->getColumns();
@@ -113,7 +113,7 @@ static NamesAndTypesList getColumnsFromTableExpression(
     return names_and_type_list;
 }
 
-NamesAndTypesList getColumnsFromTableExpression(const ASTTableExpression & table_expression, const Context & context)
+NamesAndTypesList getColumnsFromTableExpression(const ASTTableExpression & table_expression, ContextPtr context)
 {
     NamesAndTypesList materialized;
     NamesAndTypesList aliases;
@@ -121,15 +121,15 @@ NamesAndTypesList getColumnsFromTableExpression(const ASTTableExpression & table
     return getColumnsFromTableExpression(table_expression, context, materialized, aliases, virtuals);
 }
 
-TablesWithColumns getDatabaseAndTablesWithColumns(const std::vector<const ASTTableExpression *> & table_expressions, const Context & context)
+TablesWithColumns getDatabaseAndTablesWithColumns(const std::vector<const ASTTableExpression *> & table_expressions, ContextPtr context)
 {
     TablesWithColumns tables_with_columns;
 
     if (!table_expressions.empty())
     {
-        String current_database = context.getCurrentDatabase();
-        bool include_alias_cols = context.getSettingsRef().asterisk_include_alias_columns;
-        bool include_materialized_cols = context.getSettingsRef().asterisk_include_materialized_columns;
+        String current_database = context->getCurrentDatabase();
+        bool include_alias_cols = context->getSettingsRef().asterisk_include_alias_columns;
+        bool include_materialized_cols = context->getSettingsRef().asterisk_include_materialized_columns;
 
         for (const ASTTableExpression * table_expression : table_expressions)
         {
diff --git a/src/Interpreters/getTableExpressions.h b/src/Interpreters/getTableExpressions.h
index 9254fb9d6a0..961176437b5 100644
--- a/src/Interpreters/getTableExpressions.h
+++ b/src/Interpreters/getTableExpressions.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Core/NamesAndTypes.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/DatabaseAndTableWithAlias.h>
 
 namespace DB
@@ -8,7 +9,6 @@ namespace DB
 
 struct ASTTableExpression;
 class ASTSelectQuery;
-class Context;
 
 NameSet removeDuplicateColumns(NamesAndTypesList & columns);
 
@@ -16,7 +16,7 @@ std::vector<const ASTTableExpression *> getTableExpressions(const ASTSelectQuery
 const ASTTableExpression * getTableExpression(const ASTSelectQuery & select, size_t table_number);
 ASTPtr extractTableExpression(const ASTSelectQuery & select, size_t table_number);
 
-NamesAndTypesList getColumnsFromTableExpression(const ASTTableExpression & table_expression, const Context & context);
-TablesWithColumns getDatabaseAndTablesWithColumns(const std::vector<const ASTTableExpression *> & table_expressions, const Context & context);
+NamesAndTypesList getColumnsFromTableExpression(const ASTTableExpression & table_expression, ContextPtr context);
+TablesWithColumns getDatabaseAndTablesWithColumns(const std::vector<const ASTTableExpression *> & table_expressions, ContextPtr context);
 
 }
diff --git a/src/Interpreters/inplaceBlockConversions.cpp b/src/Interpreters/inplaceBlockConversions.cpp
index 47cd6cc20f6..ec625ff186e 100644
--- a/src/Interpreters/inplaceBlockConversions.cpp
+++ b/src/Interpreters/inplaceBlockConversions.cpp
@@ -92,7 +92,7 @@ ActionsDAGPtr createExpressions(
     ASTPtr expr_list,
     bool save_unneeded_columns,
     const NamesAndTypesList & required_columns,
-    const Context & context)
+    ContextPtr context)
 {
     if (!expr_list)
         return nullptr;
@@ -114,7 +114,7 @@ ActionsDAGPtr createExpressions(
 
 }
 
-void performRequiredConversions(Block & block, const NamesAndTypesList & required_columns, const Context & context)
+void performRequiredConversions(Block & block, const NamesAndTypesList & required_columns, ContextPtr context)
 {
     ASTPtr conversion_expr_list = convertRequiredExpressions(block, required_columns);
     if (conversion_expr_list->children.empty())
@@ -131,7 +131,7 @@ ActionsDAGPtr evaluateMissingDefaults(
     const Block & header,
     const NamesAndTypesList & required_columns,
     const ColumnsDescription & columns,
-    const Context & context, bool save_unneeded_columns)
+    ContextPtr context, bool save_unneeded_columns)
 {
     if (!columns.hasDefaults())
         return nullptr;
diff --git a/src/Interpreters/inplaceBlockConversions.h b/src/Interpreters/inplaceBlockConversions.h
index 63540e2994d..3d46523fafb 100644
--- a/src/Interpreters/inplaceBlockConversions.h
+++ b/src/Interpreters/inplaceBlockConversions.h
@@ -1,15 +1,16 @@
 #pragma once
 
-#include <unordered_map>
-#include <string>
+#include <Interpreters/Context_fwd.h>
+
 #include <memory>
+#include <string>
+#include <unordered_map>
 
 
 namespace DB
 {
 
 class Block;
-class Context;
 class NamesAndTypesList;
 class ColumnsDescription;
 
@@ -22,10 +23,9 @@ ActionsDAGPtr evaluateMissingDefaults(
     const Block & header,
     const NamesAndTypesList & required_columns,
     const ColumnsDescription & columns,
-    const Context & context, bool save_unneeded_columns = true);
+    ContextPtr context, bool save_unneeded_columns = true);
 
 /// Tries to convert columns in block to required_columns
-void performRequiredConversions(Block & block,
-    const NamesAndTypesList & required_columns,
-    const Context & context);
+void performRequiredConversions(Block & block, const NamesAndTypesList & required_columns, ContextPtr context);
+
 }
diff --git a/src/Interpreters/interpretSubquery.cpp b/src/Interpreters/interpretSubquery.cpp
index cf343a4fda2..2fb2f390b67 100644
--- a/src/Interpreters/interpretSubquery.cpp
+++ b/src/Interpreters/interpretSubquery.cpp
@@ -22,14 +22,14 @@ namespace ErrorCodes
 }
 
 std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
-    const ASTPtr & table_expression, const Context & context, size_t subquery_depth, const Names & required_source_columns)
+    const ASTPtr & table_expression, ContextPtr context, size_t subquery_depth, const Names & required_source_columns)
 {
     auto subquery_options = SelectQueryOptions(QueryProcessingStage::Complete, subquery_depth);
     return interpretSubquery(table_expression, context, required_source_columns, subquery_options);
 }
 
 std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
-    const ASTPtr & table_expression, const Context & context, const Names & required_source_columns, const SelectQueryOptions & options)
+    const ASTPtr & table_expression, ContextPtr context, const Names & required_source_columns, const SelectQueryOptions & options)
 {
     if (auto * expr = table_expression->as<ASTTableExpression>())
     {
@@ -59,13 +59,13 @@ std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
       *  max_rows_in_join, max_bytes_in_join, join_overflow_mode,
       *  which are checked separately (in the Set, Join objects).
       */
-    Context subquery_context = context;
-    Settings subquery_settings = context.getSettings();
+    auto subquery_context = Context::createCopy(context);
+    Settings subquery_settings = context->getSettings();
     subquery_settings.max_result_rows = 0;
     subquery_settings.max_result_bytes = 0;
     /// The calculation of `extremes` does not make sense and is not necessary (if you do it, then the `extremes` of the subquery can be taken instead of the whole query).
     subquery_settings.extremes = false;
-    subquery_context.setSettings(subquery_settings);
+    subquery_context->setSettings(subquery_settings);
 
     auto subquery_options = options.subquery();
 
@@ -88,14 +88,14 @@ std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
         /// get columns list for target table
         if (function)
         {
-            auto * query_context = const_cast<Context *>(&context.getQueryContext());
+            auto query_context = context->getQueryContext();
             const auto & storage = query_context->executeTableFunction(table_expression);
             columns = storage->getInMemoryMetadataPtr()->getColumns().getOrdinary();
             select_query->addTableFunction(*const_cast<ASTPtr *>(&table_expression)); // XXX: const_cast should be avoided!
         }
         else
         {
-            auto table_id = context.resolveStorageID(table_expression);
+            auto table_id = context->resolveStorageID(table_expression);
             const auto & storage = DatabaseCatalog::instance().getTable(table_id, context);
             columns = storage->getInMemoryMetadataPtr()->getColumns().getOrdinary();
             select_query->replaceDatabaseAndTable(table_id);
diff --git a/src/Interpreters/interpretSubquery.h b/src/Interpreters/interpretSubquery.h
index 2aee6ffd81a..3836d1f7664 100644
--- a/src/Interpreters/interpretSubquery.h
+++ b/src/Interpreters/interpretSubquery.h
@@ -6,12 +6,10 @@
 namespace DB
 {
 
-class Context;
+std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
+    const ASTPtr & table_expression, ContextPtr context, size_t subquery_depth, const Names & required_source_columns);
 
 std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
-    const ASTPtr & table_expression, const Context & context, size_t subquery_depth, const Names & required_source_columns);
-
-std::shared_ptr<InterpreterSelectWithUnionQuery> interpretSubquery(
-    const ASTPtr & table_expression, const Context & context, const Names & required_source_columns, const SelectQueryOptions & options);
+    const ASTPtr & table_expression, ContextPtr context, const Names & required_source_columns, const SelectQueryOptions & options);
 
 }
diff --git a/src/Interpreters/loadMetadata.cpp b/src/Interpreters/loadMetadata.cpp
index 71d3c7e6e5b..79076e57328 100644
--- a/src/Interpreters/loadMetadata.cpp
+++ b/src/Interpreters/loadMetadata.cpp
@@ -25,13 +25,14 @@ namespace DB
 
 static void executeCreateQuery(
     const String & query,
-    Context & context,
+    ContextPtr context,
     const String & database,
     const String & file_name,
     bool has_force_restore_data_flag)
 {
     ParserCreateQuery parser;
-    ASTPtr ast = parseQuery(parser, query.data(), query.data() + query.size(), "in file " + file_name, 0, context.getSettingsRef().max_parser_depth);
+    ASTPtr ast = parseQuery(
+        parser, query.data(), query.data() + query.size(), "in file " + file_name, 0, context->getSettingsRef().max_parser_depth);
 
     auto & ast_create_query = ast->as<ASTCreateQuery &>();
     ast_create_query.database = database;
@@ -45,7 +46,7 @@ static void executeCreateQuery(
 
 
 static void loadDatabase(
-    Context & context,
+    ContextPtr context,
     const String & database,
     const String & database_path,
     bool force_restore_data)
@@ -73,8 +74,7 @@ static void loadDatabase(
 
     try
     {
-        executeCreateQuery(database_attach_query, context, database,
-            database_metadata_file, force_restore_data);
+        executeCreateQuery(database_attach_query, context, database, database_metadata_file, force_restore_data);
     }
     catch (Exception & e)
     {
@@ -84,18 +84,18 @@ static void loadDatabase(
 }
 
 
-void loadMetadata(Context & context, const String & default_database_name)
+void loadMetadata(ContextPtr context, const String & default_database_name)
 {
     Poco::Logger * log = &Poco::Logger::get("loadMetadata");
 
-    String path = context.getPath() + "metadata";
+    String path = context->getPath() + "metadata";
 
     /** There may exist 'force_restore_data' file, that means,
       *  skip safety threshold on difference of data parts while initializing tables.
       * This file is deleted after successful loading of tables.
       * (flag is "one-shot")
       */
-    Poco::File force_restore_data_flag_file(context.getFlagsPath() + "force_restore_data");
+    Poco::File force_restore_data_flag_file(context->getFlagsPath() + "force_restore_data");
     bool has_force_restore_data_flag = force_restore_data_flag_file.exists();
 
     /// Loop over databases.
@@ -168,9 +168,9 @@ void loadMetadata(Context & context, const String & default_database_name)
 }
 
 
-void loadMetadataSystem(Context & context)
+void loadMetadataSystem(ContextPtr context)
 {
-    String path = context.getPath() + "metadata/" + DatabaseCatalog::SYSTEM_DATABASE;
+    String path = context->getPath() + "metadata/" + DatabaseCatalog::SYSTEM_DATABASE;
     String metadata_file = path + ".sql";
     if (Poco::File(path).exists() || Poco::File(metadata_file).exists())
     {
diff --git a/src/Interpreters/loadMetadata.h b/src/Interpreters/loadMetadata.h
index b23887d5282..047def84bba 100644
--- a/src/Interpreters/loadMetadata.h
+++ b/src/Interpreters/loadMetadata.h
@@ -1,16 +1,16 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+
 
 namespace DB
 {
 
-class Context;
-
 /// Load tables from system database. Only real tables like query_log, part_log.
 /// You should first load system database, then attach system tables that you need into it, then load other databases.
-void loadMetadataSystem(Context & context);
+void loadMetadataSystem(ContextPtr context);
 
 /// Load tables from databases and add them to context. Database 'system' is ignored. Use separate function to load system tables.
-void loadMetadata(Context & context, const String & default_database_name = {});
+void loadMetadata(ContextPtr context, const String & default_database_name = {});
 
 }
diff --git a/src/Interpreters/replaceAliasColumnsInQuery.cpp b/src/Interpreters/replaceAliasColumnsInQuery.cpp
index 4daa787c397..4c8367b269a 100644
--- a/src/Interpreters/replaceAliasColumnsInQuery.cpp
+++ b/src/Interpreters/replaceAliasColumnsInQuery.cpp
@@ -6,7 +6,7 @@
 namespace DB
 {
 
-void replaceAliasColumnsInQuery(ASTPtr & ast, const ColumnsDescription & columns, const NameSet & forbidden_columns, const Context & context)
+void replaceAliasColumnsInQuery(ASTPtr & ast, const ColumnsDescription & columns, const NameSet & forbidden_columns, ContextPtr context)
 {
     ColumnAliasesVisitor::Data aliase_column_data(columns, forbidden_columns, context);
     ColumnAliasesVisitor aliase_column_visitor(aliase_column_data);
diff --git a/src/Interpreters/replaceAliasColumnsInQuery.h b/src/Interpreters/replaceAliasColumnsInQuery.h
index bf7143ba099..92d2686b45b 100644
--- a/src/Interpreters/replaceAliasColumnsInQuery.h
+++ b/src/Interpreters/replaceAliasColumnsInQuery.h
@@ -1,14 +1,15 @@
 #pragma once
 
-#include <common/types.h>
 #include <Core/Names.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
+#include <common/types.h>
 
 namespace DB
 {
 
 class ColumnsDescription;
-class Context;
-void replaceAliasColumnsInQuery(ASTPtr & ast, const ColumnsDescription & columns, const NameSet & forbidden_columns, const Context & context);
+
+void replaceAliasColumnsInQuery(ASTPtr & ast, const ColumnsDescription & columns, const NameSet & forbidden_columns, ContextPtr context);
 
 }
diff --git a/src/Interpreters/tests/in_join_subqueries_preprocessor.cpp b/src/Interpreters/tests/in_join_subqueries_preprocessor.cpp
index 2b53277d02f..efe3882d086 100644
--- a/src/Interpreters/tests/in_join_subqueries_preprocessor.cpp
+++ b/src/Interpreters/tests/in_join_subqueries_preprocessor.cpp
@@ -1156,9 +1156,9 @@ static bool run()
 
 TestResult check(const TestEntry & entry)
 {
-    static DB::SharedContextHolder shared_context = DB::Context::createShared();
-    static DB::Context context = DB::Context::createGlobal(shared_context.get());
-    context.makeGlobalContext();
+    static auto shared_context = DB::Context::createShared();
+    static auto context = DB::Context::createGlobal(shared_context.get());
+    context->makeGlobalContext();
 
     try
     {
@@ -1170,8 +1170,8 @@ TestResult check(const TestEntry & entry)
         DB::DatabaseCatalog::instance().attachDatabase("test", database);
         database->attachTable("visits_all", storage_distributed_visits);
         database->attachTable("hits_all", storage_distributed_hits);
-        context.setCurrentDatabase("test");
-        context.setSetting("distributed_product_mode", entry.mode);
+        context->setCurrentDatabase("test");
+        context->setSetting("distributed_product_mode", entry.mode);
 
         /// Parse and process the incoming query.
         DB::ASTPtr ast_input;
diff --git a/src/Processors/Formats/Impl/ConstantExpressionTemplate.cpp b/src/Processors/Formats/Impl/ConstantExpressionTemplate.cpp
index caf57ded8b7..288c6ee09ef 100644
--- a/src/Processors/Formats/Impl/ConstantExpressionTemplate.cpp
+++ b/src/Processors/Formats/Impl/ConstantExpressionTemplate.cpp
@@ -144,9 +144,9 @@ class ReplaceLiteralsVisitor
 {
 public:
     LiteralsInfo replaced_literals;
-    const Context & context;
+    ContextPtr context;
 
-    explicit ReplaceLiteralsVisitor(const Context & context_) : context(context_) { }
+    explicit ReplaceLiteralsVisitor(ContextPtr context_) : context(context_) { }
 
     void visit(ASTPtr & ast, bool force_nullable)
     {
@@ -293,7 +293,7 @@ private:
 /// E.g. template of "position('some string', 'other string') != 0" is
 /// ["position", "(", DataTypeString, ",", DataTypeString, ")", "!=", DataTypeUInt64]
 ConstantExpressionTemplate::TemplateStructure::TemplateStructure(LiteralsInfo & replaced_literals, TokenIterator expression_begin, TokenIterator expression_end,
-                                                                 ASTPtr & expression, const IDataType & result_type, bool null_as_default_, const Context & context)
+                                                                 ASTPtr & expression, const IDataType & result_type, bool null_as_default_, ContextPtr context)
 {
     null_as_default = null_as_default_;
 
@@ -377,7 +377,7 @@ ConstantExpressionTemplate::Cache::getFromCacheOrConstruct(const DataTypePtr & r
                                                            TokenIterator expression_begin,
                                                            TokenIterator expression_end,
                                                            const ASTPtr & expression_,
-                                                           const Context & context,
+                                                           ContextPtr context,
                                                            bool * found_in_cache,
                                                            const String & salt)
 {
@@ -385,7 +385,7 @@ ConstantExpressionTemplate::Cache::getFromCacheOrConstruct(const DataTypePtr & r
     ASTPtr expression = expression_->clone();
     ReplaceLiteralsVisitor visitor(context);
     visitor.visit(expression, result_column_type->isNullable() || null_as_default);
-    ReplaceQueryParameterVisitor param_visitor(context.getQueryParameters());
+    ReplaceQueryParameterVisitor param_visitor(context->getQueryParameters());
     param_visitor.visit(expression);
 
     size_t template_hash = TemplateStructure::getTemplateHash(expression, visitor.replaced_literals, result_column_type, null_as_default, salt);
diff --git a/src/Processors/Formats/Impl/ConstantExpressionTemplate.h b/src/Processors/Formats/Impl/ConstantExpressionTemplate.h
index 4317cf4a3da..6659243df63 100644
--- a/src/Processors/Formats/Impl/ConstantExpressionTemplate.h
+++ b/src/Processors/Formats/Impl/ConstantExpressionTemplate.h
@@ -23,7 +23,7 @@ class ConstantExpressionTemplate : boost::noncopyable
     struct TemplateStructure : boost::noncopyable
     {
         TemplateStructure(LiteralsInfo & replaced_literals, TokenIterator expression_begin, TokenIterator expression_end,
-                          ASTPtr & expr, const IDataType & result_type, bool null_as_default_, const Context & context);
+                          ASTPtr & expr, const IDataType & result_type, bool null_as_default_, ContextPtr context);
 
         static void addNodesToCastResult(const IDataType & result_column_type, ASTPtr & expr, bool null_as_default);
         static size_t getTemplateHash(const ASTPtr & expression, const LiteralsInfo & replaced_literals,
@@ -59,7 +59,7 @@ public:
                                                      TokenIterator expression_begin,
                                                      TokenIterator expression_end,
                                                      const ASTPtr & expression_,
-                                                     const Context & context,
+                                                     ContextPtr context,
                                                      bool * found_in_cache = nullptr,
                                                      const String & salt = {});
     };
diff --git a/src/Processors/Formats/Impl/MySQLOutputFormat.cpp b/src/Processors/Formats/Impl/MySQLOutputFormat.cpp
index 9733d479a77..0f73349c271 100644
--- a/src/Processors/Formats/Impl/MySQLOutputFormat.cpp
+++ b/src/Processors/Formats/Impl/MySQLOutputFormat.cpp
@@ -40,7 +40,7 @@ void MySQLOutputFormat::initialize()
             packet_endpoint->sendPacket(getColumnDefinition(column_name, data_types[i]->getTypeId()));
         }
 
-        if (!(context->mysql.client_capabilities & Capability::CLIENT_DEPRECATE_EOF))
+        if (!(getContext()->mysql.client_capabilities & Capability::CLIENT_DEPRECATE_EOF))
         {
             packet_endpoint->sendPacket(EOFPacket(0, 0));
         }
@@ -64,7 +64,7 @@ void MySQLOutputFormat::finalize()
 {
     size_t affected_rows = 0;
     std::string human_readable_info;
-    if (QueryStatus * process_list_elem = context->getProcessListElement())
+    if (QueryStatus * process_list_elem = getContext()->getProcessListElement())
     {
         CurrentThread::finalizePerformanceCounters();
         QueryStatusInfo info = process_list_elem->getInfo();
@@ -78,10 +78,11 @@ void MySQLOutputFormat::finalize()
 
     const auto & header = getPort(PortKind::Main).getHeader();
     if (header.columns() == 0)
-        packet_endpoint->sendPacket(OKPacket(0x0, context->mysql.client_capabilities, affected_rows, 0, 0, "", human_readable_info), true);
-    else
-    if (context->mysql.client_capabilities & CLIENT_DEPRECATE_EOF)
-        packet_endpoint->sendPacket(OKPacket(0xfe, context->mysql.client_capabilities, affected_rows, 0, 0, "", human_readable_info), true);
+        packet_endpoint->sendPacket(
+            OKPacket(0x0, getContext()->mysql.client_capabilities, affected_rows, 0, 0, "", human_readable_info), true);
+    else if (getContext()->mysql.client_capabilities & CLIENT_DEPRECATE_EOF)
+        packet_endpoint->sendPacket(
+            OKPacket(0xfe, getContext()->mysql.client_capabilities, affected_rows, 0, 0, "", human_readable_info), true);
     else
         packet_endpoint->sendPacket(EOFPacket(0, 0), true);
 }
diff --git a/src/Processors/Formats/Impl/MySQLOutputFormat.h b/src/Processors/Formats/Impl/MySQLOutputFormat.h
index c47bbaadc33..01a892410df 100644
--- a/src/Processors/Formats/Impl/MySQLOutputFormat.h
+++ b/src/Processors/Formats/Impl/MySQLOutputFormat.h
@@ -15,21 +15,20 @@ namespace DB
 class IColumn;
 class IDataType;
 class WriteBuffer;
-class Context;
 
 /** A stream for outputting data in a binary line-by-line format.
   */
-class MySQLOutputFormat final : public IOutputFormat
+class MySQLOutputFormat final : public IOutputFormat, WithConstContext
 {
 public:
     MySQLOutputFormat(WriteBuffer & out_, const Block & header_, const FormatSettings & settings_);
 
     String getName() const override { return "MySQLOutputFormat"; }
 
-    void setContext(const Context & context_)
+    void setContext(ContextConstPtr context_)
     {
-        context = &context_;
-        packet_endpoint = std::make_unique<MySQLProtocol::PacketEndpoint>(out, const_cast<uint8_t &>(context_.mysql.sequence_id)); /// TODO: fix it
+        context = context_;
+        packet_endpoint = std::make_unique<MySQLProtocol::PacketEndpoint>(out, const_cast<uint8_t &>(getContext()->mysql.sequence_id)); /// TODO: fix it
     }
 
     void consume(Chunk) override;
@@ -40,10 +39,8 @@ public:
     void initialize();
 
 private:
-
     bool initialized = false;
 
-    const Context * context = nullptr;
     std::unique_ptr<MySQLProtocol::PacketEndpoint> packet_endpoint;
     FormatSettings format_settings;
     DataTypes data_types;
diff --git a/src/Processors/Formats/Impl/ValuesBlockInputFormat.cpp b/src/Processors/Formats/Impl/ValuesBlockInputFormat.cpp
index c054145016d..701385447b4 100644
--- a/src/Processors/Formats/Impl/ValuesBlockInputFormat.cpp
+++ b/src/Processors/Formats/Impl/ValuesBlockInputFormat.cpp
@@ -358,7 +358,7 @@ bool ValuesBlockInputFormat::parseExpression(IColumn & column, size_t column_idx
                 TokenIterator(tokens),
                 token_iterator,
                 ast,
-                *context,
+                context,
                 &found_in_cache,
                 delimiter);
             templates[column_idx].emplace(structure);
@@ -400,7 +400,7 @@ bool ValuesBlockInputFormat::parseExpression(IColumn & column, size_t column_idx
     /// Try to evaluate single expression if other parsers don't work
     buf.position() = const_cast<char *>(token_iterator->begin);
 
-    std::pair<Field, DataTypePtr> value_raw = evaluateConstantExpression(ast, *context);
+    std::pair<Field, DataTypePtr> value_raw = evaluateConstantExpression(ast, context);
 
     Field & expression_value = value_raw.first;
 
diff --git a/src/Processors/Formats/Impl/ValuesBlockInputFormat.h b/src/Processors/Formats/Impl/ValuesBlockInputFormat.h
index 8e7e15c572d..ea5ab9239e0 100644
--- a/src/Processors/Formats/Impl/ValuesBlockInputFormat.h
+++ b/src/Processors/Formats/Impl/ValuesBlockInputFormat.h
@@ -1,21 +1,19 @@
 #pragma once
 
 #include <Core/Block.h>
-#include <Processors/Formats/IInputFormat.h>
-#include <Processors/Formats/IRowInputFormat.h>
 #include <Formats/FormatSettings.h>
-#include <Processors/Formats/Impl/ConstantExpressionTemplate.h>
-
+#include <Interpreters/Context.h>
 #include <IO/PeekableReadBuffer.h>
 #include <Parsers/ExpressionListParsers.h>
+#include <Processors/Formats/IInputFormat.h>
+#include <Processors/Formats/IRowInputFormat.h>
+#include <Processors/Formats/Impl/ConstantExpressionTemplate.h>
 
 namespace DB
 {
 
-class Context;
 class ReadBuffer;
 
-
 /** Stream to read data in VALUES format (as in INSERT query).
   */
 class ValuesBlockInputFormat final : public IInputFormat
@@ -36,7 +34,7 @@ public:
     void resetParser() override;
 
     /// TODO: remove context somehow.
-    void setContext(const Context & context_) { context = std::make_unique<Context>(context_); }
+    void setContext(ContextConstPtr context_) { context = Context::createCopy(context_); }
 
     const BlockMissingValues & getMissingValues() const override { return block_missing_values; }
 
@@ -68,12 +66,11 @@ private:
 
     bool skipToNextRow(size_t min_chunk_bytes = 0, int balance = 0);
 
-private:
     PeekableReadBuffer buf;
 
     const RowInputFormatParams params;
 
-    std::unique_ptr<Context> context;   /// pimpl
+    ContextPtr context;   /// pimpl
     const FormatSettings format_settings;
 
     const size_t num_columns;
diff --git a/src/Processors/Pipe.h b/src/Processors/Pipe.h
index b74dfb60ecb..4ba08787579 100644
--- a/src/Processors/Pipe.h
+++ b/src/Processors/Pipe.h
@@ -1,8 +1,9 @@
 #pragma once
+
 #include <Processors/IProcessor.h>
-#include <Processors/Sources/SourceWithProgress.h>
 #include <Processors/QueryPlan/QueryIdHolder.h>
 #include <Processors/QueryPlan/QueryPlan.h>
+#include <Processors/Sources/SourceWithProgress.h>
 
 namespace DB
 {
diff --git a/src/Processors/QueryPipeline.cpp b/src/Processors/QueryPipeline.cpp
index f4bb7ca15cc..cabf5f19190 100644
--- a/src/Processors/QueryPipeline.cpp
+++ b/src/Processors/QueryPipeline.cpp
@@ -258,7 +258,7 @@ QueryPipeline QueryPipeline::unitePipelines(
 }
 
 
-void QueryPipeline::addCreatingSetsTransform(const Block & res_header, SubqueryForSet subquery_for_set, const SizeLimits & limits, const Context & context)
+void QueryPipeline::addCreatingSetsTransform(const Block & res_header, SubqueryForSet subquery_for_set, const SizeLimits & limits, ContextPtr context)
 {
     resize(1);
 
diff --git a/src/Processors/QueryPipeline.h b/src/Processors/QueryPipeline.h
index 1c1243e288f..ac0777d22c6 100644
--- a/src/Processors/QueryPipeline.h
+++ b/src/Processors/QueryPipeline.h
@@ -1,19 +1,16 @@
 #pragma once
-#include <Processors/IProcessor.h>
-#include <Processors/Executors/PipelineExecutor.h>
-#include <Processors/Pipe.h>
 
 #include <DataStreams/IBlockInputStream.h>
 #include <DataStreams/IBlockOutputStream.h>
-
+#include <Processors/Executors/PipelineExecutor.h>
+#include <Processors/IProcessor.h>
+#include <Processors/Pipe.h>
 #include <Storages/IStorage_fwd.h>
 #include <Storages/TableLockHolder.h>
 
 namespace DB
 {
 
-class Context;
-
 class IOutputFormat;
 
 class QueryPipelineProcessorsCollector;
@@ -98,7 +95,7 @@ public:
     /// This is used for CreatingSets.
     void addPipelineBefore(QueryPipeline pipeline);
 
-    void addCreatingSetsTransform(const Block & res_header, SubqueryForSet subquery_for_set, const SizeLimits & limits, const Context & context);
+    void addCreatingSetsTransform(const Block & res_header, SubqueryForSet subquery_for_set, const SizeLimits & limits, ContextPtr context);
 
     PipelineExecutorPtr execute();
 
diff --git a/src/Processors/QueryPlan/BuildQueryPipelineSettings.cpp b/src/Processors/QueryPlan/BuildQueryPipelineSettings.cpp
index 0ff77770793..9691da4a362 100644
--- a/src/Processors/QueryPlan/BuildQueryPipelineSettings.cpp
+++ b/src/Processors/QueryPlan/BuildQueryPipelineSettings.cpp
@@ -13,9 +13,9 @@ BuildQueryPipelineSettings BuildQueryPipelineSettings::fromSettings(const Settin
     return settings;
 }
 
-BuildQueryPipelineSettings BuildQueryPipelineSettings::fromContext(const Context & from)
+BuildQueryPipelineSettings BuildQueryPipelineSettings::fromContext(ContextPtr from)
 {
-    return fromSettings(from.getSettingsRef());
+    return fromSettings(from->getSettingsRef());
 }
 
 }
diff --git a/src/Processors/QueryPlan/BuildQueryPipelineSettings.h b/src/Processors/QueryPlan/BuildQueryPipelineSettings.h
index 3fd37b6042e..c3282d43778 100644
--- a/src/Processors/QueryPlan/BuildQueryPipelineSettings.h
+++ b/src/Processors/QueryPlan/BuildQueryPipelineSettings.h
@@ -1,12 +1,13 @@
 #pragma once
-#include <cstddef>
+
 #include <Interpreters/ExpressionActionsSettings.h>
 
+#include <cstddef>
+
 namespace DB
 {
 
 struct Settings;
-class Context;
 
 struct BuildQueryPipelineSettings
 {
@@ -15,7 +16,7 @@ struct BuildQueryPipelineSettings
     const ExpressionActionsSettings & getActionsSettings() const { return actions_settings; }
 
     static BuildQueryPipelineSettings fromSettings(const Settings & from);
-    static BuildQueryPipelineSettings fromContext(const Context & from);
+    static BuildQueryPipelineSettings fromContext(ContextPtr from);
 };
 
 }
diff --git a/src/Processors/QueryPlan/CreatingSetsStep.cpp b/src/Processors/QueryPlan/CreatingSetsStep.cpp
index ec710d493ed..9ea8e7b237b 100644
--- a/src/Processors/QueryPlan/CreatingSetsStep.cpp
+++ b/src/Processors/QueryPlan/CreatingSetsStep.cpp
@@ -33,18 +33,18 @@ CreatingSetStep::CreatingSetStep(
     String description_,
     SubqueryForSet subquery_for_set_,
     SizeLimits network_transfer_limits_,
-    const Context & context_)
+    ContextPtr context_)
     : ITransformingStep(input_stream_, Block{}, getTraits())
+    , WithContext(context_)
     , description(std::move(description_))
     , subquery_for_set(std::move(subquery_for_set_))
     , network_transfer_limits(std::move(network_transfer_limits_))
-    , context(context_)
 {
 }
 
 void CreatingSetStep::transformPipeline(QueryPipeline & pipeline, const BuildQueryPipelineSettings &)
 {
-    pipeline.addCreatingSetsTransform(getOutputStream().header, std::move(subquery_for_set), network_transfer_limits, context);
+    pipeline.addCreatingSetsTransform(getOutputStream().header, std::move(subquery_for_set), network_transfer_limits, getContext());
 }
 
 void CreatingSetStep::describeActions(FormatSettings & settings) const
@@ -109,7 +109,7 @@ void CreatingSetsStep::describePipeline(FormatSettings & settings) const
 }
 
 void addCreatingSetsStep(
-    QueryPlan & query_plan, SubqueriesForSets subqueries_for_sets, const SizeLimits & limits, const Context & context)
+    QueryPlan & query_plan, SubqueriesForSets subqueries_for_sets, const SizeLimits & limits, ContextPtr context)
 {
     DataStreams input_streams;
     input_streams.emplace_back(query_plan.getCurrentDataStream());
diff --git a/src/Processors/QueryPlan/CreatingSetsStep.h b/src/Processors/QueryPlan/CreatingSetsStep.h
index 14006a1a384..c2b452ecdf5 100644
--- a/src/Processors/QueryPlan/CreatingSetsStep.h
+++ b/src/Processors/QueryPlan/CreatingSetsStep.h
@@ -1,13 +1,15 @@
 #pragma once
+
 #include <Processors/QueryPlan/ITransformingStep.h>
 #include <DataStreams/SizeLimits.h>
 #include <Interpreters/SubqueryForSet.h>
+#include <Interpreters/Context_fwd.h>
 
 namespace DB
 {
 
 /// Creates sets for subqueries and JOIN. See CreatingSetsTransform.
-class CreatingSetStep : public ITransformingStep
+class CreatingSetStep : public ITransformingStep, WithContext
 {
 public:
     CreatingSetStep(
@@ -15,7 +17,7 @@ public:
             String description_,
             SubqueryForSet subquery_for_set_,
             SizeLimits network_transfer_limits_,
-            const Context & context_);
+            ContextPtr context_);
 
     String getName() const override { return "CreatingSet"; }
 
@@ -27,7 +29,6 @@ private:
     String description;
     SubqueryForSet subquery_for_set;
     SizeLimits network_transfer_limits;
-    const Context & context;
 };
 
 class CreatingSetsStep : public IQueryPlanStep
@@ -49,6 +50,6 @@ void addCreatingSetsStep(
     QueryPlan & query_plan,
     SubqueriesForSets subqueries_for_sets,
     const SizeLimits & limits,
-    const Context & context);
+    ContextPtr context);
 
 }
diff --git a/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.cpp b/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.cpp
index 2de67585efb..1472fb87a89 100644
--- a/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.cpp
+++ b/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.cpp
@@ -14,9 +14,9 @@ QueryPlanOptimizationSettings QueryPlanOptimizationSettings::fromSettings(const
     return settings;
 }
 
-QueryPlanOptimizationSettings QueryPlanOptimizationSettings::fromContext(const Context & from)
+QueryPlanOptimizationSettings QueryPlanOptimizationSettings::fromContext(ContextPtr from)
 {
-    return fromSettings(from.getSettingsRef());
+    return fromSettings(from->getSettingsRef());
 }
 
 }
diff --git a/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h b/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h
index af1ad59566c..b5a37bf69d6 100644
--- a/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h
+++ b/src/Processors/QueryPlan/Optimizations/QueryPlanOptimizationSettings.h
@@ -1,12 +1,13 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+
 #include <cstddef>
 
 namespace DB
 {
 
 struct Settings;
-class Context;
 
 struct QueryPlanOptimizationSettings
 {
@@ -21,7 +22,7 @@ struct QueryPlanOptimizationSettings
     bool filter_push_down = true;
 
     static QueryPlanOptimizationSettings fromSettings(const Settings & from);
-    static QueryPlanOptimizationSettings fromContext(const Context & from);
+    static QueryPlanOptimizationSettings fromContext(ContextPtr from);
 };
 
 }
diff --git a/src/Processors/QueryPlan/QueryPlan.h b/src/Processors/QueryPlan/QueryPlan.h
index d5cc2e8f4e8..bf7ed81fdc1 100644
--- a/src/Processors/QueryPlan/QueryPlan.h
+++ b/src/Processors/QueryPlan/QueryPlan.h
@@ -1,10 +1,12 @@
 #pragma once
-#include <memory>
-#include <list>
-#include <vector>
-#include <set>
 
 #include <Core/Names.h>
+#include <Interpreters/Context_fwd.h>
+
+#include <list>
+#include <memory>
+#include <set>
+#include <vector>
 
 namespace DB
 {
@@ -17,7 +19,6 @@ using QueryPlanStepPtr = std::unique_ptr<IQueryPlanStep>;
 class QueryPipeline;
 using QueryPipelinePtr = std::unique_ptr<QueryPipeline>;
 
-class Context;
 class WriteBuffer;
 
 class QueryPlan;
diff --git a/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.cpp b/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.cpp
index e1f72b2bb04..734e6db318d 100644
--- a/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.cpp
+++ b/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.cpp
@@ -28,7 +28,7 @@ SettingQuotaAndLimitsStep::SettingQuotaAndLimitsStep(
     StreamLocalLimits & limits_,
     SizeLimits & leaf_limits_,
     std::shared_ptr<const EnabledQuota> quota_,
-    std::shared_ptr<Context> context_)
+    ContextPtr context_)
     : ITransformingStep(input_stream_, input_stream_.header, getTraits())
     , context(std::move(context_))
     , storage(std::move(storage_))
diff --git a/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.h b/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.h
index 167e644e26d..3c73c208b70 100644
--- a/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.h
+++ b/src/Processors/QueryPlan/SettingQuotaAndLimitsStep.h
@@ -1,4 +1,6 @@
 #pragma once
+
+#include <Interpreters/Context_fwd.h>
 #include <Processors/QueryPlan/ITransformingStep.h>
 #include <Storages/TableLockHolder.h>
 #include <DataStreams/StreamLocalLimits.h>
@@ -26,14 +28,14 @@ public:
         StreamLocalLimits & limits_,
         SizeLimits & leaf_limits_,
         std::shared_ptr<const EnabledQuota> quota_,
-        std::shared_ptr<Context> context_);
+        ContextPtr context_);
 
     String getName() const override { return "SettingQuotaAndLimits"; }
 
     void transformPipeline(QueryPipeline & pipeline, const BuildQueryPipelineSettings &) override;
 
 private:
-    std::shared_ptr<Context> context;
+    ContextPtr context;
     StoragePtr storage;
     TableLockHolder table_lock;
     StreamLocalLimits limits;
diff --git a/src/Processors/Transforms/CreatingSetsTransform.cpp b/src/Processors/Transforms/CreatingSetsTransform.cpp
index c5fb4f3a952..a5b5958eff1 100644
--- a/src/Processors/Transforms/CreatingSetsTransform.cpp
+++ b/src/Processors/Transforms/CreatingSetsTransform.cpp
@@ -25,11 +25,11 @@ CreatingSetsTransform::CreatingSetsTransform(
     Block out_header_,
     SubqueryForSet subquery_for_set_,
     SizeLimits network_transfer_limits_,
-    const Context & context_)
+    ContextPtr context_)
     : IAccumulatingTransform(std::move(in_header_), std::move(out_header_))
+    , WithContext(context_)
     , subquery(std::move(subquery_for_set_))
     , network_transfer_limits(std::move(network_transfer_limits_))
-    , context(context_)
 {
 }
 
@@ -51,7 +51,7 @@ void CreatingSetsTransform::startSubquery()
         LOG_TRACE(log, "Filling temporary table.");
 
     if (subquery.table)
-        table_out = subquery.table->write({}, subquery.table->getInMemoryMetadataPtr(), context);
+        table_out = subquery.table->write({}, subquery.table->getInMemoryMetadataPtr(), getContext());
 
     done_with_set = !subquery.set;
     done_with_join = !subquery.join;
diff --git a/src/Processors/Transforms/CreatingSetsTransform.h b/src/Processors/Transforms/CreatingSetsTransform.h
index 3452de63ea0..a5787b0a5f5 100644
--- a/src/Processors/Transforms/CreatingSetsTransform.h
+++ b/src/Processors/Transforms/CreatingSetsTransform.h
@@ -1,9 +1,12 @@
 #pragma once
-#include <Poco/Logger.h>
-#include <Processors/IAccumulatingTransform.h>
-#include <Interpreters/SubqueryForSet.h>
-#include <Common/Stopwatch.h>
+
 #include <DataStreams/SizeLimits.h>
+#include <Interpreters/Context_fwd.h>
+#include <Interpreters/SubqueryForSet.h>
+#include <Processors/IAccumulatingTransform.h>
+#include <Common/Stopwatch.h>
+
+#include <Poco/Logger.h>
 
 namespace DB
 {
@@ -16,7 +19,7 @@ using ProgressCallback = std::function<void(const Progress & progress)>;
 /// Don't return any data. Sets are created when Finish status is returned.
 /// In general, several work() methods need to be called to finish.
 /// Independent processors is created for each subquery.
-class CreatingSetsTransform : public IAccumulatingTransform
+class CreatingSetsTransform : public IAccumulatingTransform, WithContext
 {
 public:
     CreatingSetsTransform(
@@ -24,7 +27,7 @@ public:
         Block out_header_,
         SubqueryForSet subquery_for_set_,
         SizeLimits network_transfer_limits_,
-        const Context & context_);
+        ContextPtr context_);
 
     String getName() const override { return "CreatingSetsTransform"; }
 
@@ -44,7 +47,6 @@ private:
     bool done_with_table = true;
 
     SizeLimits network_transfer_limits;
-    const Context & context;
 
     size_t rows_to_transfer = 0;
     size_t bytes_to_transfer = 0;
diff --git a/src/Server/GRPCServer.cpp b/src/Server/GRPCServer.cpp
index 52a2c106488..6f0f2d30123 100644
--- a/src/Server/GRPCServer.cpp
+++ b/src/Server/GRPCServer.cpp
@@ -521,7 +521,7 @@ namespace
         Poco::Logger * log = nullptr;
 
         std::shared_ptr<NamedSession> session;
-        std::optional<Context> query_context;
+        ContextPtr query_context;
         std::optional<CurrentThread::QueryScope> query_scope;
         String query_text;
         ASTPtr ast;
@@ -651,7 +651,7 @@ namespace
         }
 
         /// Create context.
-        query_context.emplace(iserver.context());
+        query_context = Context::createCopy(iserver.context());
 
         /// Authentication.
         query_context->setUser(user, password, user_address);
@@ -665,11 +665,11 @@ namespace
         {
             session = query_context->acquireNamedSession(
                 query_info.session_id(), getSessionTimeout(query_info, iserver.config()), query_info.session_check());
-            query_context = session->context;
+            query_context = Context::createCopy(session->context);
             query_context->setSessionContext(session->context);
         }
 
-        query_scope.emplace(*query_context);
+        query_scope.emplace(query_context);
 
         /// Set client info.
         ClientInfo & client_info = query_context->getClientInfo();
@@ -741,26 +741,26 @@ namespace
             output_format = query_context->getDefaultFormat();
 
         /// Set callback to create and fill external tables
-        query_context->setExternalTablesInitializer([this] (Context & context)
+        query_context->setExternalTablesInitializer([this] (ContextPtr context)
         {
-            if (&context != &*query_context)
+            if (context != query_context)
                 throw Exception("Unexpected context in external tables initializer", ErrorCodes::LOGICAL_ERROR);
             createExternalTables();
         });
 
         /// Set callbacks to execute function input().
-        query_context->setInputInitializer([this] (Context & context, const StoragePtr & input_storage)
+        query_context->setInputInitializer([this] (ContextPtr context, const StoragePtr & input_storage)
         {
-            if (&context != &query_context.value())
+            if (context != query_context)
                 throw Exception("Unexpected context in Input initializer", ErrorCodes::LOGICAL_ERROR);
             input_function_is_used = true;
             initializeBlockInputStream(input_storage->getInMemoryMetadataPtr()->getSampleBlock());
             block_input_stream->readPrefix();
         });
 
-        query_context->setInputBlocksReaderCallback([this](Context & context) -> Block
+        query_context->setInputBlocksReaderCallback([this](ContextPtr context) -> Block
         {
-            if (&context != &query_context.value())
+            if (context != query_context)
                 throw Exception("Unexpected context in InputBlocksReader", ErrorCodes::LOGICAL_ERROR);
             auto block = block_input_stream->read();
             if (!block)
@@ -775,7 +775,7 @@ namespace
             query_end = insert_query->data;
         }
         String query(begin, query_end);
-        io = ::DB::executeQuery(query, *query_context, false, QueryProcessingStage::Complete, true, true);
+        io = ::DB::executeQuery(query, query_context, false, QueryProcessingStage::Complete, true, true);
     }
 
     void Call::processInput()
@@ -878,10 +878,10 @@ namespace
                 auto table_id = query_context->resolveStorageID(insert_query->table_id, Context::ResolveOrdinary);
                 if (query_context->getSettingsRef().input_format_defaults_for_omitted_fields && table_id)
                 {
-                    StoragePtr storage = DatabaseCatalog::instance().getTable(table_id, *query_context);
+                    StoragePtr storage = DatabaseCatalog::instance().getTable(table_id, query_context);
                     const auto & columns = storage->getInMemoryMetadataPtr()->getColumns();
                     if (!columns.empty())
-                        block_input_stream = std::make_shared<AddingDefaultsBlockInputStream>(block_input_stream, columns, *query_context);
+                        block_input_stream = std::make_shared<AddingDefaultsBlockInputStream>(block_input_stream, columns, query_context);
                 }
             }
         }
@@ -903,7 +903,7 @@ namespace
                 StoragePtr storage;
                 if (auto resolved = query_context->tryResolveStorageID(temporary_id, Context::ResolveExternal))
                 {
-                    storage = DatabaseCatalog::instance().getTable(resolved, *query_context);
+                    storage = DatabaseCatalog::instance().getTable(resolved, query_context);
                 }
                 else
                 {
@@ -918,7 +918,7 @@ namespace
                         column.type = DataTypeFactory::instance().get(name_and_type.type());
                         columns.emplace_back(std::move(column));
                     }
-                    auto temporary_table = TemporaryTableHolder(*query_context, ColumnsDescription{columns}, {});
+                    auto temporary_table = TemporaryTableHolder(query_context, ColumnsDescription{columns}, {});
                     storage = temporary_table.getTable();
                     query_context->addExternalTable(temporary_id.table_name, std::move(temporary_table));
                 }
@@ -927,17 +927,17 @@ namespace
                 {
                     /// The data will be written directly to the table.
                     auto metadata_snapshot = storage->getInMemoryMetadataPtr();
-                    auto out_stream = storage->write(ASTPtr(), metadata_snapshot, *query_context);
+                    auto out_stream = storage->write(ASTPtr(), metadata_snapshot, query_context);
                     ReadBufferFromMemory data(external_table.data().data(), external_table.data().size());
                     String format = external_table.format();
                     if (format.empty())
                         format = "TabSeparated";
-                    Context * external_table_context = &*query_context;
-                    std::optional<Context> temp_context;
+                    ContextPtr external_table_context = query_context;
+                    ContextPtr temp_context;
                     if (!external_table.settings().empty())
                     {
-                        temp_context = *query_context;
-                        external_table_context = &*temp_context;
+                        temp_context = Context::createCopy(query_context);
+                        external_table_context = temp_context;
                         SettingsChanges settings_changes;
                         for (const auto & [key, value] : external_table.settings())
                             settings_changes.push_back({key, value});
diff --git a/src/Server/HTTP/HTTPServer.cpp b/src/Server/HTTP/HTTPServer.cpp
index 5554a0ee31d..42e6467d0af 100644
--- a/src/Server/HTTP/HTTPServer.cpp
+++ b/src/Server/HTTP/HTTPServer.cpp
@@ -6,7 +6,7 @@
 namespace DB
 {
 HTTPServer::HTTPServer(
-    const Context & context,
+    ContextPtr context,
     HTTPRequestHandlerFactoryPtr factory_,
     UInt16 port_number,
     Poco::Net::HTTPServerParams::Ptr params)
@@ -15,7 +15,7 @@ HTTPServer::HTTPServer(
 }
 
 HTTPServer::HTTPServer(
-    const Context & context,
+    ContextPtr context,
     HTTPRequestHandlerFactoryPtr factory_,
     const Poco::Net::ServerSocket & socket,
     Poco::Net::HTTPServerParams::Ptr params)
@@ -24,7 +24,7 @@ HTTPServer::HTTPServer(
 }
 
 HTTPServer::HTTPServer(
-    const Context & context,
+    ContextPtr context,
     HTTPRequestHandlerFactoryPtr factory_,
     Poco::ThreadPool & thread_pool,
     const Poco::Net::ServerSocket & socket,
diff --git a/src/Server/HTTP/HTTPServer.h b/src/Server/HTTP/HTTPServer.h
index 3d2a2ac9cf4..d95bdff0baa 100644
--- a/src/Server/HTTP/HTTPServer.h
+++ b/src/Server/HTTP/HTTPServer.h
@@ -17,19 +17,19 @@ class HTTPServer : public Poco::Net::TCPServer
 {
 public:
     explicit HTTPServer(
-        const Context & context,
+        ContextPtr context,
         HTTPRequestHandlerFactoryPtr factory,
         UInt16 port_number = 80,
         Poco::Net::HTTPServerParams::Ptr params = new Poco::Net::HTTPServerParams);
 
     HTTPServer(
-        const Context & context,
+        ContextPtr context,
         HTTPRequestHandlerFactoryPtr factory,
         const Poco::Net::ServerSocket & socket,
         Poco::Net::HTTPServerParams::Ptr params);
 
     HTTPServer(
-        const Context & context,
+        ContextPtr context,
         HTTPRequestHandlerFactoryPtr factory,
         Poco::ThreadPool & thread_pool,
         const Poco::Net::ServerSocket & socket,
diff --git a/src/Server/HTTP/HTTPServerConnection.cpp b/src/Server/HTTP/HTTPServerConnection.cpp
index 7a6cd4cab54..19985949005 100644
--- a/src/Server/HTTP/HTTPServerConnection.cpp
+++ b/src/Server/HTTP/HTTPServerConnection.cpp
@@ -6,11 +6,11 @@ namespace DB
 {
 
 HTTPServerConnection::HTTPServerConnection(
-    const Context & context_,
+    ContextPtr context_,
     const Poco::Net::StreamSocket & socket,
     Poco::Net::HTTPServerParams::Ptr params_,
     HTTPRequestHandlerFactoryPtr factory_)
-    : TCPServerConnection(socket), context(context_), params(params_), factory(factory_), stopped(false)
+    : TCPServerConnection(socket), context(Context::createCopy(context_)), params(params_), factory(factory_), stopped(false)
 {
     poco_check_ptr(factory);
 }
diff --git a/src/Server/HTTP/HTTPServerConnection.h b/src/Server/HTTP/HTTPServerConnection.h
index 55b6e921d9f..1c7ae6cd2b7 100644
--- a/src/Server/HTTP/HTTPServerConnection.h
+++ b/src/Server/HTTP/HTTPServerConnection.h
@@ -14,7 +14,7 @@ class HTTPServerConnection : public Poco::Net::TCPServerConnection
 {
 public:
     HTTPServerConnection(
-        const Context & context,
+        ContextPtr context,
         const Poco::Net::StreamSocket & socket,
         Poco::Net::HTTPServerParams::Ptr params,
         HTTPRequestHandlerFactoryPtr factory);
@@ -25,7 +25,7 @@ protected:
     static void sendErrorResponse(Poco::Net::HTTPServerSession & session, Poco::Net::HTTPResponse::HTTPStatus status);
 
 private:
-    Context context;
+    ContextPtr context;
     Poco::Net::HTTPServerParams::Ptr params;
     HTTPRequestHandlerFactoryPtr factory;
     bool stopped;
diff --git a/src/Server/HTTP/HTTPServerConnectionFactory.cpp b/src/Server/HTTP/HTTPServerConnectionFactory.cpp
index 876ccb9096b..0e4fb6cfcec 100644
--- a/src/Server/HTTP/HTTPServerConnectionFactory.cpp
+++ b/src/Server/HTTP/HTTPServerConnectionFactory.cpp
@@ -5,8 +5,8 @@
 namespace DB
 {
 HTTPServerConnectionFactory::HTTPServerConnectionFactory(
-    const Context & context_, Poco::Net::HTTPServerParams::Ptr params_, HTTPRequestHandlerFactoryPtr factory_)
-    : context(context_), params(params_), factory(factory_)
+    ContextPtr context_, Poco::Net::HTTPServerParams::Ptr params_, HTTPRequestHandlerFactoryPtr factory_)
+    : context(Context::createCopy(context_)), params(params_), factory(factory_)
 {
     poco_check_ptr(factory);
 }
diff --git a/src/Server/HTTP/HTTPServerConnectionFactory.h b/src/Server/HTTP/HTTPServerConnectionFactory.h
index 4f8ca43cbfb..3f11eca0f69 100644
--- a/src/Server/HTTP/HTTPServerConnectionFactory.h
+++ b/src/Server/HTTP/HTTPServerConnectionFactory.h
@@ -12,12 +12,12 @@ namespace DB
 class HTTPServerConnectionFactory : public Poco::Net::TCPServerConnectionFactory
 {
 public:
-    HTTPServerConnectionFactory(const Context & context, Poco::Net::HTTPServerParams::Ptr params, HTTPRequestHandlerFactoryPtr factory);
+    HTTPServerConnectionFactory(ContextPtr context, Poco::Net::HTTPServerParams::Ptr params, HTTPRequestHandlerFactoryPtr factory);
 
     Poco::Net::TCPServerConnection * createConnection(const Poco::Net::StreamSocket & socket) override;
 
 private:
-    Context context;
+    ContextPtr context;
     Poco::Net::HTTPServerParams::Ptr params;
     HTTPRequestHandlerFactoryPtr factory;
 };
diff --git a/src/Server/HTTP/HTTPServerRequest.cpp b/src/Server/HTTP/HTTPServerRequest.cpp
index ab8b803c29d..69dc8d4dbda 100644
--- a/src/Server/HTTP/HTTPServerRequest.cpp
+++ b/src/Server/HTTP/HTTPServerRequest.cpp
@@ -15,8 +15,8 @@
 
 namespace DB
 {
-HTTPServerRequest::HTTPServerRequest(const Context & context, HTTPServerResponse & response, Poco::Net::HTTPServerSession & session)
-    : max_uri_size(context.getSettingsRef().http_max_uri_size)
+HTTPServerRequest::HTTPServerRequest(ContextPtr context, HTTPServerResponse & response, Poco::Net::HTTPServerSession & session)
+    : max_uri_size(context->getSettingsRef().http_max_uri_size)
 {
     response.attachRequest(this);
 
@@ -24,8 +24,8 @@ HTTPServerRequest::HTTPServerRequest(const Context & context, HTTPServerResponse
     client_address = session.clientAddress();
     server_address = session.serverAddress();
 
-    auto receive_timeout = context.getSettingsRef().http_receive_timeout;
-    auto send_timeout = context.getSettingsRef().http_send_timeout;
+    auto receive_timeout = context->getSettingsRef().http_receive_timeout;
+    auto send_timeout = context->getSettingsRef().http_send_timeout;
 
     session.socket().setReceiveTimeout(receive_timeout);
     session.socket().setSendTimeout(send_timeout);
diff --git a/src/Server/HTTP/HTTPServerRequest.h b/src/Server/HTTP/HTTPServerRequest.h
index a0f022f32ec..a560f907cf0 100644
--- a/src/Server/HTTP/HTTPServerRequest.h
+++ b/src/Server/HTTP/HTTPServerRequest.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
 #include <IO/ReadBuffer.h>
 #include <Server/HTTP/HTTPRequest.h>
 
@@ -8,14 +9,13 @@
 namespace DB
 {
 
-class Context;
 class HTTPServerResponse;
 class ReadBufferFromPocoSocket;
 
 class HTTPServerRequest : public HTTPRequest
 {
 public:
-    HTTPServerRequest(const Context & context, HTTPServerResponse & response, Poco::Net::HTTPServerSession & session);
+    HTTPServerRequest(ContextPtr context, HTTPServerResponse & response, Poco::Net::HTTPServerSession & session);
 
     /// FIXME: it's a little bit inconvenient interface. The rationale is that all other ReadBuffer's wrap each other
     ///        via unique_ptr - but we can't inherit HTTPServerRequest from ReadBuffer and pass it around,
diff --git a/src/Server/HTTPHandler.cpp b/src/Server/HTTPHandler.cpp
index 6b4981beae0..8aed5d20f74 100644
--- a/src/Server/HTTPHandler.cpp
+++ b/src/Server/HTTPHandler.cpp
@@ -277,7 +277,7 @@ HTTPHandler::~HTTPHandler()
 
 
 bool HTTPHandler::authenticateUser(
-    Context & context,
+    ContextPtr context,
     HTTPServerRequest & request,
     HTMLForm & params,
     HTTPServerResponse & response)
@@ -381,7 +381,7 @@ bool HTTPHandler::authenticateUser(
 
     /// Set client info. It will be used for quota accounting parameters in 'setUser' method.
 
-    ClientInfo & client_info = context.getClientInfo();
+    ClientInfo & client_info = context->getClientInfo();
     client_info.query_kind = ClientInfo::QueryKind::INITIAL_QUERY;
     client_info.interface = ClientInfo::Interface::HTTP;
 
@@ -398,7 +398,7 @@ bool HTTPHandler::authenticateUser(
 
     try
     {
-        context.setUser(*request_credentials, request.clientAddress());
+        context->setUser(*request_credentials, request.clientAddress());
     }
     catch (const Authentication::Require<BasicCredentials> & required_credentials)
     {
@@ -430,7 +430,7 @@ bool HTTPHandler::authenticateUser(
     request_credentials.reset();
 
     if (!quota_key.empty())
-        context.setQuotaKey(quota_key);
+        context->setQuotaKey(quota_key);
 
     /// Query sent through HTTP interface is initial.
     client_info.initial_user = client_info.current_user;
@@ -441,7 +441,7 @@ bool HTTPHandler::authenticateUser(
 
 
 void HTTPHandler::processQuery(
-    Context & context,
+    ContextPtr context,
     HTTPServerRequest & request,
     HTMLForm & params,
     HTTPServerResponse & response,
@@ -470,10 +470,10 @@ void HTTPHandler::processQuery(
         session_timeout = parseSessionTimeout(config, params);
         std::string session_check = params.get("session_check", "");
 
-        session = context.acquireNamedSession(session_id, session_timeout, session_check == "1");
+        session = context->acquireNamedSession(session_id, session_timeout, session_check == "1");
 
-        context = session->context;
-        context.setSessionContext(session->context);
+        context->copyFrom(session->context);  /// FIXME: maybe move this part to HandleRequest(), copyFrom() is used only here.
+        context->setSessionContext(session->context);
     }
 
     SCOPE_EXIT({
@@ -489,7 +489,7 @@ void HTTPHandler::processQuery(
     {
         std::string opentelemetry_traceparent = request.get("traceparent");
         std::string error;
-        if (!context.getClientInfo().client_trace_context.parseTraceparentHeader(
+        if (!context->getClientInfo().client_trace_context.parseTraceparentHeader(
             opentelemetry_traceparent, error))
         {
             throw Exception(ErrorCodes::BAD_REQUEST_PARAMETER,
@@ -497,14 +497,14 @@ void HTTPHandler::processQuery(
                 opentelemetry_traceparent, error);
         }
 
-        context.getClientInfo().client_trace_context.tracestate = request.get("tracestate", "");
+        context->getClientInfo().client_trace_context.tracestate = request.get("tracestate", "");
     }
 #endif
 
     // Set the query id supplied by the user, if any, and also update the OpenTelemetry fields.
-    context.setCurrentQueryId(params.get("query_id", request.get("X-ClickHouse-Query-Id", "")));
+    context->setCurrentQueryId(params.get("query_id", request.get("X-ClickHouse-Query-Id", "")));
 
-    ClientInfo & client_info = context.getClientInfo();
+    ClientInfo & client_info = context->getClientInfo();
     client_info.initial_query_id = client_info.current_query_id;
 
     /// The client can pass a HTTP header indicating supported compression method (gzip or deflate).
@@ -570,7 +570,7 @@ void HTTPHandler::processQuery(
 
         if (buffer_until_eof)
         {
-            const std::string tmp_path(context.getTemporaryVolume()->getDisk()->getPath());
+            const std::string tmp_path(context->getTemporaryVolume()->getDisk()->getPath());
             const std::string tmp_path_template(tmp_path + "http_buffers/");
 
             auto create_tmp_disk_buffer = [tmp_path_template] (const WriteBufferPtr &)
@@ -658,13 +658,13 @@ void HTTPHandler::processQuery(
 
     /// In theory if initially readonly = 0, the client can change any setting and then set readonly
     /// to some other value.
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
 
     /// Only readonly queries are allowed for HTTP GET requests.
     if (request.getMethod() == HTTPServerRequest::HTTP_GET)
     {
         if (settings.readonly == 0)
-            context.setSetting("readonly", 2);
+            context->setSetting("readonly", 2);
     }
 
     bool has_external_data = startsWith(request.getContentType(), "multipart/form-data");
@@ -707,14 +707,14 @@ void HTTPHandler::processQuery(
     }
 
     if (!database.empty())
-        context.setCurrentDatabase(database);
+        context->setCurrentDatabase(database);
 
     if (!default_format.empty())
-        context.setDefaultFormat(default_format);
+        context->setDefaultFormat(default_format);
 
     /// For external data we also want settings
-    context.checkSettingsConstraints(settings_changes);
-    context.applySettingsChanges(settings_changes);
+    context->checkSettingsConstraints(settings_changes);
+    context->applySettingsChanges(settings_changes);
 
     const auto & query = getQuery(request, params, context);
     std::unique_ptr<ReadBuffer> in_param = std::make_unique<ReadBufferFromString>(query);
@@ -737,11 +737,11 @@ void HTTPHandler::processQuery(
     /// Origin header.
     used_output.out->addHeaderCORS(settings.add_http_cors_header && !request.get("Origin", "").empty());
 
-    auto append_callback = [&context] (ProgressCallback callback)
+    auto append_callback = [context] (ProgressCallback callback)
     {
-        auto prev = context.getProgressCallback();
+        auto prev = context->getProgressCallback();
 
-        context.setProgressCallback([prev, callback] (const Progress & progress)
+        context->setProgressCallback([prev, callback] (const Progress & progress)
         {
             if (prev)
                 prev(progress);
@@ -756,12 +756,12 @@ void HTTPHandler::processQuery(
 
     if (settings.readonly > 0 && settings.cancel_http_readonly_queries_on_client_close)
     {
-        append_callback([&context, &request](const Progress &)
+        append_callback([context, &request](const Progress &)
         {
             /// Assume that at the point this method is called no one is reading data from the socket any more:
             /// should be true for read-only queries.
             if (!request.checkPeerConnected())
-                context.killCurrentQuery();
+                context->killCurrentQuery();
         });
     }
 
@@ -877,7 +877,7 @@ void HTTPHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse
     if (!request_context)
     {
         // Context should be initialized before anything, for correct memory accounting.
-        request_context = std::make_unique<Context>(server.context());
+        request_context = Context::createCopy(server.context());
         request_credentials.reset();
     }
 
@@ -899,6 +899,7 @@ void HTTPHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse
         HTMLForm params(request);
         with_stacktrace = params.getParsed<bool>("stacktrace", false);
 
+        /// FIXME: maybe this check is already unnecessary.
         /// Workaround. Poco does not detect 411 Length Required case.
         if (request.getMethod() == HTTPRequest::HTTP_POST && !request.getChunkedTransferEncoding() && !request.hasContentLength())
         {
@@ -907,7 +908,7 @@ void HTTPHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse
                 ErrorCodes::HTTP_LENGTH_REQUIRED);
         }
 
-        processQuery(*request_context, request, params, response, used_output, query_scope);
+        processQuery(request_context, request, params, response, used_output, query_scope);
         LOG_DEBUG(log, (request_credentials ? "Authentication in progress..." : "Done processing query"));
     }
     catch (...)
@@ -936,7 +937,7 @@ DynamicQueryHandler::DynamicQueryHandler(IServer & server_, const std::string &
 {
 }
 
-bool DynamicQueryHandler::customizeQueryParam(Context & context, const std::string & key, const std::string & value)
+bool DynamicQueryHandler::customizeQueryParam(ContextPtr context, const std::string & key, const std::string & value)
 {
     if (key == param_name)
         return true;    /// do nothing
@@ -945,14 +946,14 @@ bool DynamicQueryHandler::customizeQueryParam(Context & context, const std::stri
     {
         /// Save name and values of substitution in dictionary.
         const String parameter_name = key.substr(strlen("param_"));
-        context.setQueryParameter(parameter_name, value);
+        context->setQueryParameter(parameter_name, value);
         return true;
     }
 
     return false;
 }
 
-std::string DynamicQueryHandler::getQuery(HTTPServerRequest & request, HTMLForm & params, Context & context)
+std::string DynamicQueryHandler::getQuery(HTTPServerRequest & request, HTMLForm & params, ContextPtr context)
 {
     if (likely(!startsWith(request.getContentType(), "multipart/form-data")))
     {
@@ -978,25 +979,31 @@ std::string DynamicQueryHandler::getQuery(HTTPServerRequest & request, HTMLForm
 }
 
 PredefinedQueryHandler::PredefinedQueryHandler(
-    IServer & server_, const NameSet & receive_params_, const std::string & predefined_query_
-    , const CompiledRegexPtr & url_regex_, const std::unordered_map<String, CompiledRegexPtr> & header_name_with_regex_)
-    : HTTPHandler(server_, "PredefinedQueryHandler"), receive_params(receive_params_), predefined_query(predefined_query_)
-    , url_regex(url_regex_), header_name_with_capture_regex(header_name_with_regex_)
+    IServer & server_,
+    const NameSet & receive_params_,
+    const std::string & predefined_query_,
+    const CompiledRegexPtr & url_regex_,
+    const std::unordered_map<String, CompiledRegexPtr> & header_name_with_regex_)
+    : HTTPHandler(server_, "PredefinedQueryHandler")
+    , receive_params(receive_params_)
+    , predefined_query(predefined_query_)
+    , url_regex(url_regex_)
+    , header_name_with_capture_regex(header_name_with_regex_)
 {
 }
 
-bool PredefinedQueryHandler::customizeQueryParam(Context & context, const std::string & key, const std::string & value)
+bool PredefinedQueryHandler::customizeQueryParam(ContextPtr context, const std::string & key, const std::string & value)
 {
     if (receive_params.count(key))
     {
-        context.setQueryParameter(key, value);
+        context->setQueryParameter(key, value);
         return true;
     }
 
     return false;
 }
 
-void PredefinedQueryHandler::customizeContext(HTTPServerRequest & request, DB::Context & context)
+void PredefinedQueryHandler::customizeContext(HTTPServerRequest & request, ContextPtr context)
 {
     /// If in the configuration file, the handler's header is regex and contains named capture group
     /// We will extract regex named capture groups as query parameters
@@ -1014,7 +1021,7 @@ void PredefinedQueryHandler::customizeContext(HTTPServerRequest & request, DB::C
                 const auto & capturing_value = matches[capturing_index];
 
                 if (capturing_value.data())
-                    context.setQueryParameter(capturing_name, String(capturing_value.data(), capturing_value.size()));
+                    context->setQueryParameter(capturing_name, String(capturing_value.data(), capturing_value.size()));
             }
         }
     };
@@ -1032,7 +1039,7 @@ void PredefinedQueryHandler::customizeContext(HTTPServerRequest & request, DB::C
     }
 }
 
-std::string PredefinedQueryHandler::getQuery(HTTPServerRequest & request, HTMLForm & params, Context & context)
+std::string PredefinedQueryHandler::getQuery(HTTPServerRequest & request, HTMLForm & params, ContextPtr context)
 {
     if (unlikely(startsWith(request.getContentType(), "multipart/form-data")))
     {
diff --git a/src/Server/HTTPHandler.h b/src/Server/HTTPHandler.h
index 0f1d75664bd..4715949cb87 100644
--- a/src/Server/HTTPHandler.h
+++ b/src/Server/HTTPHandler.h
@@ -18,7 +18,6 @@ namespace Poco { class Logger; }
 namespace DB
 {
 
-class Context;
 class Credentials;
 class IServer;
 class WriteBufferFromHTTPServerResponse;
@@ -34,11 +33,11 @@ public:
     void handleRequest(HTTPServerRequest & request, HTTPServerResponse & response) override;
 
     /// This method is called right before the query execution.
-    virtual void customizeContext(HTTPServerRequest & /* request */, Context & /* context */) {}
+    virtual void customizeContext(HTTPServerRequest & /* request */, ContextPtr /* context */) {}
 
-    virtual bool customizeQueryParam(Context & context, const std::string & key, const std::string & value) = 0;
+    virtual bool customizeQueryParam(ContextPtr context, const std::string & key, const std::string & value) = 0;
 
-    virtual std::string getQuery(HTTPServerRequest & request, HTMLForm & params, Context & context) = 0;
+    virtual std::string getQuery(HTTPServerRequest & request, HTMLForm & params, ContextPtr context) = 0;
 
 private:
     struct Output
@@ -74,7 +73,7 @@ private:
 
     // The request_context and the request_credentials instances may outlive a single request/response loop.
     // This happens only when the authentication mechanism requires more than a single request/response exchange (e.g., SPNEGO).
-    std::unique_ptr<Context> request_context;
+    ContextPtr request_context;
     std::unique_ptr<Credentials> request_credentials;
 
     // Returns true when the user successfully authenticated,
@@ -83,14 +82,14 @@ private:
     //  the request_context and request_credentials instances are preserved.
     // Throws an exception if authentication failed.
     bool authenticateUser(
-        Context & context,
+        ContextPtr context,
         HTTPServerRequest & request,
         HTMLForm & params,
         HTTPServerResponse & response);
 
     /// Also initializes 'used_output'.
     void processQuery(
-        Context & context,
+        ContextPtr context,
         HTTPServerRequest & request,
         HTMLForm & params,
         HTTPServerResponse & response,
@@ -114,9 +113,9 @@ private:
 public:
     explicit DynamicQueryHandler(IServer & server_, const std::string & param_name_ = "query");
 
-    std::string getQuery(HTTPServerRequest & request, HTMLForm & params, Context & context) override;
+    std::string getQuery(HTTPServerRequest & request, HTMLForm & params, ContextPtr context) override;
 
-    bool customizeQueryParam(Context &context, const std::string &key, const std::string &value) override;
+    bool customizeQueryParam(ContextPtr context, const std::string &key, const std::string &value) override;
 };
 
 class PredefinedQueryHandler : public HTTPHandler
@@ -131,11 +130,11 @@ public:
         IServer & server_, const NameSet & receive_params_, const std::string & predefined_query_
         , const CompiledRegexPtr & url_regex_, const std::unordered_map<String, CompiledRegexPtr> & header_name_with_regex_);
 
-    virtual void customizeContext(HTTPServerRequest & request, Context & context) override;
+    virtual void customizeContext(HTTPServerRequest & request, ContextPtr context) override;
 
-    std::string getQuery(HTTPServerRequest & request, HTMLForm & params, Context & context) override;
+    std::string getQuery(HTTPServerRequest & request, HTMLForm & params, ContextPtr context) override;
 
-    bool customizeQueryParam(Context & context, const std::string & key, const std::string & value) override;
+    bool customizeQueryParam(ContextPtr context, const std::string & key, const std::string & value) override;
 };
 
 }
diff --git a/src/Server/IServer.h b/src/Server/IServer.h
index 131e7443646..80736fda3ea 100644
--- a/src/Server/IServer.h
+++ b/src/Server/IServer.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
+
 namespace Poco
 {
 
@@ -7,6 +9,7 @@ namespace Util
 {
 class LayeredConfiguration;
 }
+
 class Logger;
 
 }
@@ -15,8 +18,6 @@ class Logger;
 namespace DB
 {
 
-class Context;
-
 class IServer
 {
 public:
@@ -27,12 +28,12 @@ public:
     virtual Poco::Logger & logger() const = 0;
 
     /// Returns global application's context.
-    virtual Context & context() const = 0;
+    virtual ContextPtr context() const = 0;
 
     /// Returns true if shutdown signaled.
     virtual bool isCancelled() const = 0;
 
-    virtual ~IServer() {}
+    virtual ~IServer() = default;
 };
 
 }
diff --git a/src/Server/InterserverIOHTTPHandler.cpp b/src/Server/InterserverIOHTTPHandler.cpp
index 98dfae7d0cb..64af8860b23 100644
--- a/src/Server/InterserverIOHTTPHandler.cpp
+++ b/src/Server/InterserverIOHTTPHandler.cpp
@@ -25,7 +25,7 @@ namespace ErrorCodes
 
 std::pair<String, bool> InterserverIOHTTPHandler::checkAuthentication(HTTPServerRequest & request) const
 {
-    auto server_credentials = server.context().getInterserverCredentials();
+    auto server_credentials = server.context()->getInterserverCredentials();
     if (server_credentials)
     {
         if (!request.hasCredentials())
@@ -59,7 +59,7 @@ void InterserverIOHTTPHandler::processQuery(HTTPServerRequest & request, HTTPSer
 
     auto & body = request.getStream();
 
-    auto endpoint = server.context().getInterserverIOHandler().getEndpoint(endpoint_name);
+    auto endpoint = server.context()->getInterserverIOHandler().getEndpoint(endpoint_name);
     /// Locked for read while query processing
     std::shared_lock lock(endpoint->rwlock);
     if (endpoint->blocker.isCancelled())
diff --git a/src/Server/KeeperTCPHandler.cpp b/src/Server/KeeperTCPHandler.cpp
index bf725581a29..1dadd3437f7 100644
--- a/src/Server/KeeperTCPHandler.cpp
+++ b/src/Server/KeeperTCPHandler.cpp
@@ -192,11 +192,11 @@ struct SocketInterruptablePollWrapper
 KeeperTCPHandler::KeeperTCPHandler(IServer & server_, const Poco::Net::StreamSocket & socket_)
     : Poco::Net::TCPServerConnection(socket_)
     , server(server_)
-    , log(&Poco::Logger::get("KeeperTCPHandler"))
-    , global_context(server.context())
-    , nu_keeper_storage_dispatcher(global_context.getKeeperStorageDispatcher())
-    , operation_timeout(0, global_context.getConfigRef().getUInt("keeper_server.operation_timeout_ms", Coordination::DEFAULT_OPERATION_TIMEOUT_MS) * 1000)
-    , session_timeout(0, global_context.getConfigRef().getUInt("keeper_server.session_timeout_ms", Coordination::DEFAULT_SESSION_TIMEOUT_MS) * 1000)
+    , log(&Poco::Logger::get("NuKeeperTCPHandler"))
+    , global_context(Context::createCopy(server.context()))
+    , nu_keeper_storage_dispatcher(global_context->getKeeperStorageDispatcher())
+    , operation_timeout(0, global_context->getConfigRef().getUInt("test_keeper_server.operation_timeout_ms", Coordination::DEFAULT_OPERATION_TIMEOUT_MS) * 1000)
+    , session_timeout(0, global_context->getConfigRef().getUInt("test_keeper_server.session_timeout_ms", Coordination::DEFAULT_SESSION_TIMEOUT_MS) * 1000)
     , poll_wrapper(std::make_unique<SocketInterruptablePollWrapper>(socket_))
     , responses(std::make_unique<ThreadSafeResponseQueue>())
 {
@@ -258,8 +258,8 @@ void KeeperTCPHandler::runImpl()
 {
     setThreadName("TstKprHandler");
     ThreadStatus thread_status;
-    auto global_receive_timeout = global_context.getSettingsRef().receive_timeout;
-    auto global_send_timeout = global_context.getSettingsRef().send_timeout;
+    auto global_receive_timeout = global_context->getSettingsRef().receive_timeout;
+    auto global_send_timeout = global_context->getSettingsRef().send_timeout;
 
     socket().setReceiveTimeout(global_receive_timeout);
     socket().setSendTimeout(global_send_timeout);
diff --git a/src/Server/KeeperTCPHandler.h b/src/Server/KeeperTCPHandler.h
index fecaf1cc38f..6c3929198c0 100644
--- a/src/Server/KeeperTCPHandler.h
+++ b/src/Server/KeeperTCPHandler.h
@@ -37,7 +37,7 @@ public:
 private:
     IServer & server;
     Poco::Logger * log;
-    Context global_context;
+    ContextPtr global_context;
     std::shared_ptr<KeeperStorageDispatcher> nu_keeper_storage_dispatcher;
     Poco::Timespan operation_timeout;
     Poco::Timespan session_timeout;
diff --git a/src/Server/MySQLHandler.cpp b/src/Server/MySQLHandler.cpp
index 75c88a6ff93..7b1df092aa1 100644
--- a/src/Server/MySQLHandler.cpp
+++ b/src/Server/MySQLHandler.cpp
@@ -72,7 +72,7 @@ MySQLHandler::MySQLHandler(IServer & server_, const Poco::Net::StreamSocket & so
     : Poco::Net::TCPServerConnection(socket_)
     , server(server_)
     , log(&Poco::Logger::get("MySQLHandler"))
-    , connection_context(server.context())
+    , connection_context(Context::createCopy(server.context()))
     , connection_id(connection_id_)
     , auth_plugin(new MySQLProtocol::Authentication::Native41())
 {
@@ -89,14 +89,14 @@ void MySQLHandler::run()
 {
     setThreadName("MySQLHandler");
     ThreadStatus thread_status;
-    connection_context.makeSessionContext();
-    connection_context.getClientInfo().interface = ClientInfo::Interface::MYSQL;
-    connection_context.setDefaultFormat("MySQLWire");
-    connection_context.getClientInfo().connection_id = connection_id;
+    connection_context->makeSessionContext();
+    connection_context->getClientInfo().interface = ClientInfo::Interface::MYSQL;
+    connection_context->setDefaultFormat("MySQLWire");
+    connection_context->getClientInfo().connection_id = connection_id;
 
     in = std::make_shared<ReadBufferFromPocoSocket>(socket());
     out = std::make_shared<WriteBufferFromPocoSocket>(socket());
-    packet_endpoint = std::make_shared<PacketEndpoint>(*in, *out, connection_context.mysql.sequence_id);
+    packet_endpoint = std::make_shared<PacketEndpoint>(*in, *out, connection_context->mysql.sequence_id);
 
     try
     {
@@ -108,11 +108,11 @@ void MySQLHandler::run()
 
         HandshakeResponse handshake_response;
         finishHandshake(handshake_response);
-        connection_context.mysql.client_capabilities = handshake_response.capability_flags;
+        connection_context->mysql.client_capabilities = handshake_response.capability_flags;
         if (handshake_response.max_packet_size)
-            connection_context.mysql.max_packet_size = handshake_response.max_packet_size;
-        if (!connection_context.mysql.max_packet_size)
-            connection_context.mysql.max_packet_size = MAX_PACKET_LENGTH;
+            connection_context->mysql.max_packet_size = handshake_response.max_packet_size;
+        if (!connection_context->mysql.max_packet_size)
+            connection_context->mysql.max_packet_size = MAX_PACKET_LENGTH;
 
         LOG_TRACE(log,
             "Capabilities: {}, max_packet_size: {}, character_set: {}, user: {}, auth_response length: {}, database: {}, auth_plugin_name: {}",
@@ -133,8 +133,8 @@ void MySQLHandler::run()
         try
         {
             if (!handshake_response.database.empty())
-                connection_context.setCurrentDatabase(handshake_response.database);
-            connection_context.setCurrentQueryId(Poco::format("mysql:%lu", connection_id));
+                connection_context->setCurrentDatabase(handshake_response.database);
+            connection_context->setCurrentQueryId(Poco::format("mysql:%lu", connection_id));
 
         }
         catch (const Exception & exc)
@@ -252,7 +252,7 @@ void MySQLHandler::authenticate(const String & user_name, const String & auth_pl
     try
     {
         // For compatibility with JavaScript MySQL client, Native41 authentication plugin is used when possible (if password is specified using double SHA1). Otherwise SHA256 plugin is used.
-        auto user = connection_context.getAccessControlManager().read<User>(user_name);
+        auto user = connection_context->getAccessControlManager().read<User>(user_name);
         const DB::Authentication::Type user_auth_type = user->authentication.getType();
         if (user_auth_type == DB::Authentication::SHA256_PASSWORD)
         {
@@ -276,7 +276,7 @@ void MySQLHandler::comInitDB(ReadBuffer & payload)
     String database;
     readStringUntilEOF(database, payload);
     LOG_DEBUG(log, "Setting current database to {}", database);
-    connection_context.setCurrentDatabase(database);
+    connection_context->setCurrentDatabase(database);
     packet_endpoint->sendPacket(OKPacket(0, client_capability_flags, 0, 0, 1), true);
 }
 
@@ -284,7 +284,7 @@ void MySQLHandler::comFieldList(ReadBuffer & payload)
 {
     ComFieldList packet;
     packet.readPayloadWithUnpacked(payload);
-    String database = connection_context.getCurrentDatabase();
+    String database = connection_context->getCurrentDatabase();
     StoragePtr table_ptr = DatabaseCatalog::instance().getTable({database, packet.table}, connection_context);
     auto metadata_snapshot = table_ptr->getInMemoryMetadataPtr();
     for (const NameAndTypePair & column : metadata_snapshot->getColumns().getAll())
@@ -332,11 +332,11 @@ void MySQLHandler::comQuery(ReadBuffer & payload)
 
         ReadBufferFromString replacement(replacement_query);
 
-        Context query_context = connection_context;
+        auto query_context = Context::createCopy(connection_context);
 
         std::atomic<size_t> affected_rows {0};
-        auto prev = query_context.getProgressCallback();
-        query_context.setProgressCallback([&, prev = prev](const Progress & progress)
+        auto prev = query_context->getProgressCallback();
+        query_context->setProgressCallback([&, prev = prev](const Progress & progress)
         {
             if (prev)
                 prev(progress);
@@ -391,14 +391,14 @@ void MySQLHandlerSSL::finishHandshakeSSL(
     ReadBufferFromMemory payload(buf, pos);
     payload.ignore(PACKET_HEADER_SIZE);
     ssl_request.readPayloadWithUnpacked(payload);
-    connection_context.mysql.client_capabilities = ssl_request.capability_flags;
-    connection_context.mysql.max_packet_size = ssl_request.max_packet_size ? ssl_request.max_packet_size : MAX_PACKET_LENGTH;
+    connection_context->mysql.client_capabilities = ssl_request.capability_flags;
+    connection_context->mysql.max_packet_size = ssl_request.max_packet_size ? ssl_request.max_packet_size : MAX_PACKET_LENGTH;
     secure_connection = true;
     ss = std::make_shared<SecureStreamSocket>(SecureStreamSocket::attach(socket(), SSLManager::instance().defaultServerContext()));
     in = std::make_shared<ReadBufferFromPocoSocket>(*ss);
     out = std::make_shared<WriteBufferFromPocoSocket>(*ss);
-    connection_context.mysql.sequence_id = 2;
-    packet_endpoint = std::make_shared<PacketEndpoint>(*in, *out, connection_context.mysql.sequence_id);
+    connection_context->mysql.sequence_id = 2;
+    packet_endpoint = std::make_shared<PacketEndpoint>(*in, *out, connection_context->mysql.sequence_id);
     packet_endpoint->receivePacket(packet); /// Reading HandshakeResponse from secure socket.
 }
 
diff --git a/src/Server/MySQLHandler.h b/src/Server/MySQLHandler.h
index 1418d068ffd..f5fb82b5bef 100644
--- a/src/Server/MySQLHandler.h
+++ b/src/Server/MySQLHandler.h
@@ -56,7 +56,7 @@ private:
 protected:
     Poco::Logger * log;
 
-    Context connection_context;
+    ContextPtr connection_context;
 
     std::shared_ptr<MySQLProtocol::PacketEndpoint> packet_endpoint;
 
diff --git a/src/Server/PostgreSQLHandler.cpp b/src/Server/PostgreSQLHandler.cpp
index b3a3bbf2aaa..01887444c65 100644
--- a/src/Server/PostgreSQLHandler.cpp
+++ b/src/Server/PostgreSQLHandler.cpp
@@ -33,7 +33,7 @@ PostgreSQLHandler::PostgreSQLHandler(
     std::vector<std::shared_ptr<PostgreSQLProtocol::PGAuthentication::AuthenticationMethod>> & auth_methods_)
     : Poco::Net::TCPServerConnection(socket_)
     , server(server_)
-    , connection_context(server.context())
+    , connection_context(Context::createCopy(server.context()))
     , ssl_enabled(ssl_enabled_)
     , connection_id(connection_id_)
     , authentication_manager(auth_methods_)
@@ -52,9 +52,9 @@ void PostgreSQLHandler::run()
 {
     setThreadName("PostgresHandler");
     ThreadStatus thread_status;
-    connection_context.makeSessionContext();
-    connection_context.getClientInfo().interface = ClientInfo::Interface::POSTGRESQL;
-    connection_context.setDefaultFormat("PostgreSQLWire");
+    connection_context->makeSessionContext();
+    connection_context->getClientInfo().interface = ClientInfo::Interface::POSTGRESQL;
+    connection_context->setDefaultFormat("PostgreSQLWire");
 
     try
     {
@@ -132,8 +132,8 @@ bool PostgreSQLHandler::startup()
     try
     {
         if (!start_up_msg->database.empty())
-            connection_context.setCurrentDatabase(start_up_msg->database);
-        connection_context.setCurrentQueryId(Poco::format("postgres:%d:%d", connection_id, secret_key));
+            connection_context->setCurrentDatabase(start_up_msg->database);
+        connection_context->setCurrentQueryId(Poco::format("postgres:%d:%d", connection_id, secret_key));
     }
     catch (const Exception & exc)
     {
@@ -213,8 +213,8 @@ void PostgreSQLHandler::sendParameterStatusData(PostgreSQLProtocol::Messaging::S
 
 void PostgreSQLHandler::cancelRequest()
 {
-    connection_context.setCurrentQueryId("");
-    connection_context.setDefaultFormat("Null");
+    connection_context->setCurrentQueryId("");
+    connection_context->setDefaultFormat("Null");
 
     std::unique_ptr<PostgreSQLProtocol::Messaging::CancelRequest> msg =
         message_transport->receiveWithPayloadSize<PostgreSQLProtocol::Messaging::CancelRequest>(8);
@@ -268,7 +268,7 @@ void PostgreSQLHandler::processQuery()
             return;
         }
 
-        const auto & settings = connection_context.getSettingsRef();
+        const auto & settings = connection_context->getSettingsRef();
         std::vector<String> queries;
         auto parse_res = splitMultipartQuery(query->query, queries, settings.max_query_size, settings.max_parser_depth);
         if (!parse_res.second)
diff --git a/src/Server/PostgreSQLHandler.h b/src/Server/PostgreSQLHandler.h
index 697aa9b6744..cc30c85d8bb 100644
--- a/src/Server/PostgreSQLHandler.h
+++ b/src/Server/PostgreSQLHandler.h
@@ -37,7 +37,7 @@ private:
     Poco::Logger * log = &Poco::Logger::get("PostgreSQLHandler");
 
     IServer & server;
-    Context connection_context;
+    ContextPtr connection_context;
     bool ssl_enabled;
     Int32 connection_id;
     Int32 secret_key;
diff --git a/src/Server/ReplicasStatusHandler.cpp b/src/Server/ReplicasStatusHandler.cpp
index 778f9827131..86295cc5170 100644
--- a/src/Server/ReplicasStatusHandler.cpp
+++ b/src/Server/ReplicasStatusHandler.cpp
@@ -34,7 +34,7 @@ void ReplicasStatusHandler::handleRequest(HTTPServerRequest & request, HTTPServe
         /// Even if lag is small, output detailed information about the lag.
         bool verbose = params.get("verbose", "") == "1";
 
-        const MergeTreeSettings & settings = context.getReplicatedMergeTreeSettings();
+        const MergeTreeSettings & settings = context->getReplicatedMergeTreeSettings();
 
         bool ok = true;
         WriteBufferFromOwnString message;
@@ -73,7 +73,7 @@ void ReplicasStatusHandler::handleRequest(HTTPServerRequest & request, HTTPServe
             }
         }
 
-        const auto & config = context.getConfigRef();
+        const auto & config = context->getConfigRef();
         setResponseDefaultHeaders(response, config.getUInt("keep_alive_timeout", 10));
 
         if (!ok)
diff --git a/src/Server/ReplicasStatusHandler.h b/src/Server/ReplicasStatusHandler.h
index 8a790b13ad6..eda0b15ed6f 100644
--- a/src/Server/ReplicasStatusHandler.h
+++ b/src/Server/ReplicasStatusHandler.h
@@ -12,7 +12,7 @@ class IServer;
 class ReplicasStatusHandler : public HTTPRequestHandler
 {
 private:
-    Context & context;
+    ContextPtr context;
 
 public:
     explicit ReplicasStatusHandler(IServer & server_);
diff --git a/src/Server/StaticRequestHandler.cpp b/src/Server/StaticRequestHandler.cpp
index 9f959239be9..169d6859b43 100644
--- a/src/Server/StaticRequestHandler.cpp
+++ b/src/Server/StaticRequestHandler.cpp
@@ -137,7 +137,7 @@ void StaticRequestHandler::writeResponse(WriteBuffer & out)
 
     if (startsWith(response_expression, file_prefix))
     {
-        const auto & user_files_absolute_path = Poco::Path(server.context().getUserFilesPath()).makeAbsolute().makeDirectory().toString();
+        const auto & user_files_absolute_path = Poco::Path(server.context()->getUserFilesPath()).makeAbsolute().makeDirectory().toString();
         const auto & file_name = response_expression.substr(file_prefix.size(), response_expression.size() - file_prefix.size());
 
         const auto & file_path = Poco::Path(user_files_absolute_path, file_name).makeAbsolute().toString();
diff --git a/src/Server/TCPHandler.cpp b/src/Server/TCPHandler.cpp
index 7ff18b3c0f5..d1a0ea61066 100644
--- a/src/Server/TCPHandler.cpp
+++ b/src/Server/TCPHandler.cpp
@@ -62,8 +62,8 @@ TCPHandler::TCPHandler(IServer & server_, const Poco::Net::StreamSocket & socket
     , server(server_)
     , parse_proxy_protocol(parse_proxy_protocol_)
     , log(&Poco::Logger::get("TCPHandler"))
-    , connection_context(server.context())
-    , query_context(server.context())
+    , connection_context(Context::createCopy(server.context()))
+    , query_context(Context::createCopy(server.context()))
     , server_display_name(std::move(server_display_name_))
 {
 }
@@ -86,13 +86,13 @@ void TCPHandler::runImpl()
     setThreadName("TCPHandler");
     ThreadStatus thread_status;
 
-    connection_context = server.context();
-    connection_context.makeSessionContext();
+    connection_context = Context::createCopy(server.context());
+    connection_context->makeSessionContext();
 
     /// These timeouts can be changed after receiving query.
 
-    auto global_receive_timeout = connection_context.getSettingsRef().receive_timeout;
-    auto global_send_timeout = connection_context.getSettingsRef().send_timeout;
+    auto global_receive_timeout = connection_context->getSettingsRef().receive_timeout;
+    auto global_send_timeout = connection_context->getSettingsRef().send_timeout;
 
     socket().setReceiveTimeout(global_receive_timeout);
     socket().setSendTimeout(global_send_timeout);
@@ -133,7 +133,7 @@ void TCPHandler::runImpl()
         try
         {
             /// We try to send error information to the client.
-            sendException(e, connection_context.getSettingsRef().calculate_text_stack_trace);
+            sendException(e, connection_context->getSettingsRef().calculate_text_stack_trace);
         }
         catch (...) {}
 
@@ -147,18 +147,18 @@ void TCPHandler::runImpl()
         {
             Exception e("Database " + backQuote(default_database) + " doesn't exist", ErrorCodes::UNKNOWN_DATABASE);
             LOG_ERROR(log, "Code: {}, e.displayText() = {}, Stack trace:\n\n{}", e.code(), e.displayText(), e.getStackTraceString());
-            sendException(e, connection_context.getSettingsRef().calculate_text_stack_trace);
+            sendException(e, connection_context->getSettingsRef().calculate_text_stack_trace);
             return;
         }
 
-        connection_context.setCurrentDatabase(default_database);
+        connection_context->setCurrentDatabase(default_database);
     }
 
-    Settings connection_settings = connection_context.getSettings();
+    Settings connection_settings = connection_context->getSettings();
 
     sendHello();
 
-    connection_context.setProgressCallback([this] (const Progress & value) { return this->updateProgress(value); });
+    connection_context->setProgressCallback([this] (const Progress & value) { return this->updateProgress(value); });
 
     while (true)
     {
@@ -181,7 +181,7 @@ void TCPHandler::runImpl()
             break;
 
         /// Set context of request.
-        query_context = connection_context;
+        query_context = Context::createCopy(connection_context);
 
         Stopwatch watch;
         state.reset();
@@ -214,7 +214,7 @@ void TCPHandler::runImpl()
             if (state.empty() && state.part_uuids && !receivePacket())
                 continue;
 
-            query_scope.emplace(*query_context);
+            query_scope.emplace(query_context);
 
             send_exception_with_stack_trace = query_context->getSettingsRef().calculate_text_stack_trace;
 
@@ -229,9 +229,9 @@ void TCPHandler::runImpl()
                 CurrentThread::setFatalErrorCallback([this]{ sendLogs(); });
             }
 
-            query_context->setExternalTablesInitializer([&connection_settings, this] (Context & context)
+            query_context->setExternalTablesInitializer([&connection_settings, this] (ContextPtr context)
             {
-                if (&context != &*query_context)
+                if (context != query_context)
                     throw Exception("Unexpected context in external tables initializer", ErrorCodes::LOGICAL_ERROR);
 
                 /// Get blocks of temporary tables
@@ -246,9 +246,9 @@ void TCPHandler::runImpl()
             });
 
             /// Send structure of columns to client for function input()
-            query_context->setInputInitializer([this] (Context & context, const StoragePtr & input_storage)
+            query_context->setInputInitializer([this] (ContextPtr context, const StoragePtr & input_storage)
             {
-                if (&context != &query_context.value())
+                if (context != query_context)
                     throw Exception("Unexpected context in Input initializer", ErrorCodes::LOGICAL_ERROR);
 
                 auto metadata_snapshot = input_storage->getInMemoryMetadataPtr();
@@ -266,9 +266,9 @@ void TCPHandler::runImpl()
                 sendData(state.input_header);
             });
 
-            query_context->setInputBlocksReaderCallback([&connection_settings, this] (Context & context) -> Block
+            query_context->setInputBlocksReaderCallback([&connection_settings, this] (ContextPtr context) -> Block
             {
-                if (&context != &query_context.value())
+                if (context != query_context)
                     throw Exception("Unexpected context in InputBlocksReader", ErrorCodes::LOGICAL_ERROR);
 
                 size_t poll_interval;
@@ -283,11 +283,11 @@ void TCPHandler::runImpl()
                 return state.block_for_input;
             });
 
-            customizeContext(*query_context);
+            customizeContext(query_context);
 
             bool may_have_embedded_data = client_tcp_protocol_version >= DBMS_MIN_REVISION_WITH_CLIENT_SUPPORT_EMBEDDED_DATA;
             /// Processing Query
-            state.io = executeQuery(state.query, *query_context, false, state.stage, may_have_embedded_data);
+            state.io = executeQuery(state.query, query_context, false, state.stage, may_have_embedded_data);
 
             after_check_cancelled.restart();
             after_send_progress.restart();
@@ -537,7 +537,7 @@ void TCPHandler::processInsertQuery(const Settings & connection_settings)
         {
             if (!table_id.empty())
             {
-                auto storage_ptr = DatabaseCatalog::instance().getTable(table_id, *query_context);
+                auto storage_ptr = DatabaseCatalog::instance().getTable(table_id, query_context);
                 sendTableColumns(storage_ptr->getInMemoryMetadataPtr()->getColumns());
             }
         }
@@ -701,7 +701,7 @@ void TCPHandler::processTablesStatusRequest()
     TablesStatusResponse response;
     for (const QualifiedTableName & table_name: request.tables)
     {
-        auto resolved_id = connection_context.tryResolveStorageID({table_name.database, table_name.table});
+        auto resolved_id = connection_context->tryResolveStorageID({table_name.database, table_name.table});
         StoragePtr table = DatabaseCatalog::instance().tryGetTable(resolved_id, connection_context);
         if (!table)
             continue;
@@ -862,7 +862,7 @@ bool TCPHandler::receiveProxyHeader()
     }
 
     LOG_TRACE(log, "Forwarded client address from PROXY header: {}", forwarded_address);
-    connection_context.getClientInfo().forwarded_for = forwarded_address;
+    connection_context->getClientInfo().forwarded_for = forwarded_address;
     return true;
 }
 
@@ -915,7 +915,7 @@ void TCPHandler::receiveHello()
 
     if (user != USER_INTERSERVER_MARKER)
     {
-        connection_context.setUser(user, password, socket().peerAddress());
+        connection_context->setUser(user, password, socket().peerAddress());
     }
     else
     {
@@ -1033,7 +1033,7 @@ void TCPHandler::receiveClusterNameAndSalt()
         try
         {
             /// We try to send error information to the client.
-            sendException(e, connection_context.getSettingsRef().calculate_text_stack_trace);
+            sendException(e, connection_context->getSettingsRef().calculate_text_stack_trace);
         }
         catch (...) {}
 
@@ -1236,18 +1236,18 @@ bool TCPHandler::receiveData(bool scalar)
             /// If such a table does not exist, create it.
             if (resolved)
             {
-                storage = DatabaseCatalog::instance().getTable(resolved, *query_context);
+                storage = DatabaseCatalog::instance().getTable(resolved, query_context);
             }
             else
             {
                 NamesAndTypesList columns = block.getNamesAndTypesList();
-                auto temporary_table = TemporaryTableHolder(*query_context, ColumnsDescription{columns}, {});
+                auto temporary_table = TemporaryTableHolder(query_context, ColumnsDescription{columns}, {});
                 storage = temporary_table.getTable();
                 query_context->addExternalTable(temporary_id.table_name, std::move(temporary_table));
             }
             auto metadata_snapshot = storage->getInMemoryMetadataPtr();
             /// The data will be written directly to the table.
-            auto temporary_table_out = storage->write(ASTPtr(), metadata_snapshot, *query_context);
+            auto temporary_table_out = storage->write(ASTPtr(), metadata_snapshot, query_context);
             temporary_table_out->write(block);
             temporary_table_out->writeSuffix();
 
@@ -1346,7 +1346,7 @@ void TCPHandler::initBlockOutput(const Block & block)
             *state.maybe_compressed_out,
             client_tcp_protocol_version,
             block.cloneEmpty(),
-            !connection_context.getSettingsRef().low_cardinality_allow_in_native_format);
+            !connection_context->getSettingsRef().low_cardinality_allow_in_native_format);
     }
 }
 
@@ -1359,7 +1359,7 @@ void TCPHandler::initLogsBlockOutput(const Block & block)
             *out,
             client_tcp_protocol_version,
             block.cloneEmpty(),
-            !connection_context.getSettingsRef().low_cardinality_allow_in_native_format);
+            !connection_context->getSettingsRef().low_cardinality_allow_in_native_format);
     }
 }
 
diff --git a/src/Server/TCPHandler.h b/src/Server/TCPHandler.h
index c3dd8346c8e..e0160b82962 100644
--- a/src/Server/TCPHandler.h
+++ b/src/Server/TCPHandler.h
@@ -113,14 +113,13 @@ public:
       *  because it allows to check the IP ranges of the trusted proxy.
       * Proxy-forwarded (original client) IP address is used for quota accounting if quota is keyed by forwarded IP.
       */
-    TCPHandler(IServer & server_, const Poco::Net::StreamSocket & socket_, bool parse_proxy_protocol_,
-        std::string server_display_name_);
+    TCPHandler(IServer & server_, const Poco::Net::StreamSocket & socket_, bool parse_proxy_protocol_, std::string server_display_name_);
     ~TCPHandler() override;
 
     void run() override;
 
     /// This method is called right before the query execution.
-    virtual void customizeContext(DB::Context & /*context*/) {}
+    virtual void customizeContext(ContextPtr /*context*/) {}
 
 private:
     IServer & server;
@@ -133,8 +132,8 @@ private:
     UInt64 client_version_patch = 0;
     UInt64 client_tcp_protocol_version = 0;
 
-    Context connection_context;
-    std::optional<Context> query_context;
+    ContextPtr connection_context;
+    ContextPtr query_context;
 
     /// Streams for reading/writing from/to client connection socket.
     std::shared_ptr<ReadBuffer> in;
diff --git a/src/Storages/AlterCommands.cpp b/src/Storages/AlterCommands.cpp
index 7043a32760b..e3177c167c5 100644
--- a/src/Storages/AlterCommands.cpp
+++ b/src/Storages/AlterCommands.cpp
@@ -299,7 +299,7 @@ std::optional<AlterCommand> AlterCommand::parse(const ASTAlterCommand * command_
 }
 
 
-void AlterCommand::apply(StorageInMemoryMetadata & metadata, const Context & context) const
+void AlterCommand::apply(StorageInMemoryMetadata & metadata, ContextPtr context) const
 {
     if (type == ADD_COLUMN)
     {
@@ -320,7 +320,7 @@ void AlterCommand::apply(StorageInMemoryMetadata & metadata, const Context & con
         metadata.columns.add(column, after_column, first);
 
         /// Slow, because each time a list is copied
-        if (context.getSettingsRef().flatten_nested)
+        if (context->getSettingsRef().flatten_nested)
             metadata.columns.flattenNested();
     }
     else if (type == DROP_COLUMN)
@@ -702,7 +702,7 @@ bool AlterCommand::isRemovingProperty() const
     return to_remove != RemoveProperty::NO_PROPERTY;
 }
 
-std::optional<MutationCommand> AlterCommand::tryConvertToMutationCommand(StorageInMemoryMetadata & metadata, const Context & context) const
+std::optional<MutationCommand> AlterCommand::tryConvertToMutationCommand(StorageInMemoryMetadata & metadata, ContextPtr context) const
 {
     if (!isRequireMutationStage(metadata))
         return {};
@@ -788,7 +788,7 @@ String alterTypeToString(const AlterCommand::Type type)
     __builtin_unreachable();
 }
 
-void AlterCommands::apply(StorageInMemoryMetadata & metadata, const Context & context) const
+void AlterCommands::apply(StorageInMemoryMetadata & metadata, ContextPtr context) const
 {
     if (!prepared)
         throw DB::Exception("Alter commands is not prepared. Cannot apply. It's a bug", ErrorCodes::LOGICAL_ERROR);
@@ -880,7 +880,7 @@ void AlterCommands::prepare(const StorageInMemoryMetadata & metadata)
     prepared = true;
 }
 
-void AlterCommands::validate(const StorageInMemoryMetadata & metadata, const Context & context) const
+void AlterCommands::validate(const StorageInMemoryMetadata & metadata, ContextPtr context) const
 {
     auto all_columns = metadata.columns;
     /// Default expression for all added/modified columns
@@ -907,7 +907,7 @@ void AlterCommands::validate(const StorageInMemoryMetadata & metadata, const Con
                                 ErrorCodes::BAD_ARGUMENTS};
 
             if (command.codec)
-                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context.getSettingsRef().allow_suspicious_codecs);
+                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context->getSettingsRef().allow_suspicious_codecs);
 
             all_columns.add(ColumnDescription(column_name, command.data_type));
         }
@@ -927,7 +927,7 @@ void AlterCommands::validate(const StorageInMemoryMetadata & metadata, const Con
                                 ErrorCodes::NOT_IMPLEMENTED};
 
             if (command.codec)
-                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context.getSettingsRef().allow_suspicious_codecs);
+                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context->getSettingsRef().allow_suspicious_codecs);
             auto column_default = all_columns.getDefault(column_name);
             if (column_default)
             {
@@ -1172,7 +1172,7 @@ static MutationCommand createMaterializeTTLCommand()
     return command;
 }
 
-MutationCommands AlterCommands::getMutationCommands(StorageInMemoryMetadata metadata, bool materialize_ttl, const Context & context) const
+MutationCommands AlterCommands::getMutationCommands(StorageInMemoryMetadata metadata, bool materialize_ttl, ContextPtr context) const
 {
     MutationCommands result;
     for (const auto & alter_cmd : *this)
diff --git a/src/Storages/AlterCommands.h b/src/Storages/AlterCommands.h
index c973b0b6a6f..d6c80bc5ed4 100644
--- a/src/Storages/AlterCommands.h
+++ b/src/Storages/AlterCommands.h
@@ -128,7 +128,7 @@ struct AlterCommand
 
     static std::optional<AlterCommand> parse(const ASTAlterCommand * command);
 
-    void apply(StorageInMemoryMetadata & metadata, const Context & context) const;
+    void apply(StorageInMemoryMetadata & metadata, ContextPtr context) const;
 
     /// Check that alter command require data modification (mutation) to be
     /// executed. For example, cast from Date to UInt16 type can be executed
@@ -151,7 +151,7 @@ struct AlterCommand
     /// If possible, convert alter command to mutation command. In other case
     /// return empty optional. Some storages may execute mutations after
     /// metadata changes.
-    std::optional<MutationCommand> tryConvertToMutationCommand(StorageInMemoryMetadata & metadata, const Context & context) const;
+    std::optional<MutationCommand> tryConvertToMutationCommand(StorageInMemoryMetadata & metadata, ContextPtr context) const;
 };
 
 /// Return string representation of AlterCommand::Type
@@ -170,7 +170,7 @@ public:
     /// Checks that all columns exist and dependencies between them.
     /// This check is lightweight and base only on metadata.
     /// More accurate check have to be performed with storage->checkAlterIsPossible.
-    void validate(const StorageInMemoryMetadata & metadata, const Context & context) const;
+    void validate(const StorageInMemoryMetadata & metadata, ContextPtr context) const;
 
     /// Prepare alter commands. Set ignore flag to some of them and set some
     /// parts to commands from storage's metadata (for example, absent default)
@@ -178,7 +178,7 @@ public:
 
     /// Apply all alter command in sequential order to storage metadata.
     /// Commands have to be prepared before apply.
-    void apply(StorageInMemoryMetadata & metadata, const Context & context) const;
+    void apply(StorageInMemoryMetadata & metadata, ContextPtr context) const;
 
     /// At least one command modify settings.
     bool isSettingsAlter() const;
@@ -190,7 +190,7 @@ public:
     /// alter. If alter can be performed as pure metadata update, than result is
     /// empty. If some TTL changes happened than, depending on materialize_ttl
     /// additional mutation command (MATERIALIZE_TTL) will be returned.
-    MutationCommands getMutationCommands(StorageInMemoryMetadata metadata, bool materialize_ttl, const Context & context) const;
+    MutationCommands getMutationCommands(StorageInMemoryMetadata metadata, bool materialize_ttl, ContextPtr context) const;
 };
 
 }
diff --git a/src/Storages/ColumnDefault.h b/src/Storages/ColumnDefault.h
index 1035bfcc834..38b61415a9a 100644
--- a/src/Storages/ColumnDefault.h
+++ b/src/Storages/ColumnDefault.h
@@ -1,10 +1,10 @@
 #pragma once
 
+#include <Parsers/IAST.h>
+
 #include <string>
 #include <unordered_map>
 
-#include <Parsers/IAST.h>
-
 
 namespace DB
 {
@@ -18,7 +18,7 @@ enum class ColumnDefaultKind
 
 
 ColumnDefaultKind columnDefaultKindFromString(const std::string & str);
-std::string toString(const ColumnDefaultKind kind);
+std::string toString(ColumnDefaultKind kind);
 
 
 struct ColumnDefault
diff --git a/src/Storages/ColumnsDescription.cpp b/src/Storages/ColumnsDescription.cpp
index fc6bb661986..545911f1465 100644
--- a/src/Storages/ColumnsDescription.cpp
+++ b/src/Storages/ColumnsDescription.cpp
@@ -582,7 +582,7 @@ void ColumnsDescription::removeSubcolumns(const String & name_in_storage, const
         subcolumns.erase(name_in_storage + "." + subcolumn_name);
 }
 
-Block validateColumnsDefaultsAndGetSampleBlock(ASTPtr default_expr_list, const NamesAndTypesList & all_columns, const Context & context)
+Block validateColumnsDefaultsAndGetSampleBlock(ASTPtr default_expr_list, const NamesAndTypesList & all_columns, ContextPtr context)
 {
     for (const auto & child : default_expr_list->children)
         if (child->as<ASTSelectQuery>() || child->as<ASTSelectWithUnionQuery>() || child->as<ASTSubquery>())
diff --git a/src/Storages/ColumnsDescription.h b/src/Storages/ColumnsDescription.h
index 26e30004544..7fff22abf71 100644
--- a/src/Storages/ColumnsDescription.h
+++ b/src/Storages/ColumnsDescription.h
@@ -1,18 +1,20 @@
 #pragma once
 
-#include <Core/NamesAndTypes.h>
-#include <Core/Names.h>
-#include <Core/Block.h>
-#include <Common/Exception.h>
-#include <Storages/ColumnDefault.h>
-#include <Storages/ColumnCodec.h>
-#include <optional>
 #include <Compression/CompressionFactory.h>
+#include <Core/Block.h>
+#include <Core/Names.h>
+#include <Core/NamesAndTypes.h>
+#include <Interpreters/Context_fwd.h>
+#include <Storages/ColumnCodec.h>
+#include <Storages/ColumnDefault.h>
+#include <Common/Exception.h>
 
-#include <boost/multi_index_container.hpp>
-#include <boost/multi_index/sequenced_index.hpp>
-#include <boost/multi_index/ordered_index.hpp>
 #include <boost/multi_index/member.hpp>
+#include <boost/multi_index/ordered_index.hpp>
+#include <boost/multi_index/sequenced_index.hpp>
+#include <boost/multi_index_container.hpp>
+
+#include <optional>
 
 
 namespace DB
@@ -159,5 +161,5 @@ private:
 /// default expression result can be casted to column_type. Also checks, that we
 /// don't have strange constructions in default expression like SELECT query or
 /// arrayJoin function.
-Block validateColumnsDefaultsAndGetSampleBlock(ASTPtr default_expr_list, const NamesAndTypesList & all_columns, const Context & context);
+Block validateColumnsDefaultsAndGetSampleBlock(ASTPtr default_expr_list, const NamesAndTypesList & all_columns, ContextPtr context);
 }
diff --git a/src/Storages/ConstraintsDescription.cpp b/src/Storages/ConstraintsDescription.cpp
index e6315872a66..1e86a17523b 100644
--- a/src/Storages/ConstraintsDescription.cpp
+++ b/src/Storages/ConstraintsDescription.cpp
@@ -41,7 +41,7 @@ ConstraintsDescription ConstraintsDescription::parse(const String & str)
     return res;
 }
 
-ConstraintsExpressions ConstraintsDescription::getExpressions(const DB::Context & context,
+ConstraintsExpressions ConstraintsDescription::getExpressions(const DB::ContextPtr context,
                                                               const DB::NamesAndTypesList & source_columns_) const
 {
     ConstraintsExpressions res;
diff --git a/src/Storages/ConstraintsDescription.h b/src/Storages/ConstraintsDescription.h
index d6d2baefbd2..5e6416822bb 100644
--- a/src/Storages/ConstraintsDescription.h
+++ b/src/Storages/ConstraintsDescription.h
@@ -19,7 +19,7 @@ struct ConstraintsDescription
 
     static ConstraintsDescription parse(const String & str);
 
-    ConstraintsExpressions getExpressions(const Context & context, const NamesAndTypesList & source_columns_) const;
+    ConstraintsExpressions getExpressions(ContextPtr context, const NamesAndTypesList & source_columns_) const;
 
     ConstraintsDescription(const ConstraintsDescription & other);
     ConstraintsDescription & operator=(const ConstraintsDescription & other);
diff --git a/src/Storages/Distributed/DirectoryMonitor.cpp b/src/Storages/Distributed/DirectoryMonitor.cpp
index 162c8cd978c..2afa9747c60 100644
--- a/src/Storages/Distributed/DirectoryMonitor.cpp
+++ b/src/Storages/Distributed/DirectoryMonitor.cpp
@@ -280,14 +280,14 @@ StorageDistributedDirectoryMonitor::StorageDistributedDirectoryMonitor(
     , disk(disk_)
     , relative_path(relative_path_)
     , path(disk->getPath() + relative_path + '/')
-    , should_batch_inserts(storage.global_context.getSettingsRef().distributed_directory_monitor_batch_inserts)
+    , should_batch_inserts(storage.getContext()->getSettingsRef().distributed_directory_monitor_batch_inserts)
     , dir_fsync(storage.getDistributedSettingsRef().fsync_directories)
-    , min_batched_block_size_rows(storage.global_context.getSettingsRef().min_insert_block_size_rows)
-    , min_batched_block_size_bytes(storage.global_context.getSettingsRef().min_insert_block_size_bytes)
+    , min_batched_block_size_rows(storage.getContext()->getSettingsRef().min_insert_block_size_rows)
+    , min_batched_block_size_bytes(storage.getContext()->getSettingsRef().min_insert_block_size_bytes)
     , current_batch_file_path(path + "current_batch.txt")
-    , default_sleep_time(storage.global_context.getSettingsRef().distributed_directory_monitor_sleep_time_ms.totalMilliseconds())
+    , default_sleep_time(storage.getContext()->getSettingsRef().distributed_directory_monitor_sleep_time_ms.totalMilliseconds())
     , sleep_time(default_sleep_time)
-    , max_sleep_time(storage.global_context.getSettingsRef().distributed_directory_monitor_max_sleep_time_ms.totalMilliseconds())
+    , max_sleep_time(storage.getContext()->getSettingsRef().distributed_directory_monitor_max_sleep_time_ms.totalMilliseconds())
     , log(&Poco::Logger::get(getLoggerName()))
     , monitor_blocker(monitor_blocker_)
     , metric_pending_files(CurrentMetrics::DistributedFilesToInsert, 0)
@@ -462,7 +462,7 @@ ConnectionPoolPtr StorageDistributedDirectoryMonitor::createPool(const std::stri
 
     auto pools = createPoolsForAddresses(name, pool_factory, storage.log);
 
-    const auto settings = storage.global_context.getSettings();
+    const auto settings = storage.getContext()->getSettings();
     return pools.size() == 1 ? pools.front() : std::make_shared<ConnectionPoolWithFailover>(pools,
         settings.load_balancing,
         settings.distributed_replica_error_half_life.totalSeconds(),
@@ -526,7 +526,7 @@ bool StorageDistributedDirectoryMonitor::processFiles(const std::map<UInt64, std
 void StorageDistributedDirectoryMonitor::processFile(const std::string & file_path)
 {
     Stopwatch watch;
-    auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(storage.global_context.getSettingsRef());
+    auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(storage.getContext()->getSettingsRef());
 
     try
     {
@@ -661,7 +661,7 @@ struct StorageDistributedDirectoryMonitor::Batch
 
             Poco::File{tmp_file}.renameTo(parent.current_batch_file_path);
         }
-        auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(parent.storage.global_context.getSettingsRef());
+        auto timeouts = ConnectionTimeouts::getTCPTimeoutsWithFailover(parent.storage.getContext()->getSettingsRef());
         auto connection = parent.pool->get(timeouts);
 
         bool batch_broken = false;
diff --git a/src/Storages/Distributed/DistributedBlockOutputStream.cpp b/src/Storages/Distributed/DistributedBlockOutputStream.cpp
index 72b90f9751d..d05fbae60d9 100644
--- a/src/Storages/Distributed/DistributedBlockOutputStream.cpp
+++ b/src/Storages/Distributed/DistributedBlockOutputStream.cpp
@@ -87,14 +87,14 @@ static void writeBlockConvert(const BlockOutputStreamPtr & out, const Block & bl
 
 
 DistributedBlockOutputStream::DistributedBlockOutputStream(
-    const Context & context_,
+    ContextPtr context_,
     StorageDistributed & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
     const ASTPtr & query_ast_,
     const ClusterPtr & cluster_,
     bool insert_sync_,
     UInt64 insert_timeout_)
-    : context(std::make_unique<Context>(context_))
+    : context(Context::createCopy(context_))
     , storage(storage_)
     , metadata_snapshot(metadata_snapshot_)
     , query_ast(query_ast_)
@@ -363,7 +363,7 @@ DistributedBlockOutputStream::runWritingJob(DistributedBlockOutputStream::JobRep
             if (!job.stream)
             {
                 /// Forward user settings
-                job.local_context = std::make_unique<Context>(*context);
+                job.local_context = Context::createCopy(context);
 
                 /// Copying of the query AST is required to avoid race,
                 /// in case of INSERT into multiple local shards.
@@ -373,7 +373,7 @@ DistributedBlockOutputStream::runWritingJob(DistributedBlockOutputStream::JobRep
                 /// to resolve tables (in InterpreterInsertQuery::getTable())
                 auto copy_query_ast = query_ast->clone();
 
-                InterpreterInsertQuery interp(copy_query_ast, *job.local_context);
+                InterpreterInsertQuery interp(copy_query_ast, job.local_context);
                 auto block_io = interp.execute();
 
                 job.stream = block_io.out;
@@ -604,7 +604,7 @@ void DistributedBlockOutputStream::writeAsyncImpl(const Block & block, size_t sh
 void DistributedBlockOutputStream::writeToLocal(const Block & block, size_t repeats)
 {
     /// Async insert does not support settings forwarding yet whereas sync one supports
-    InterpreterInsertQuery interp(query_ast, *context);
+    InterpreterInsertQuery interp(query_ast, context);
 
     auto block_io = interp.execute();
 
diff --git a/src/Storages/Distributed/DistributedBlockOutputStream.h b/src/Storages/Distributed/DistributedBlockOutputStream.h
index 8a1cef43f44..a9425a98ebf 100644
--- a/src/Storages/Distributed/DistributedBlockOutputStream.h
+++ b/src/Storages/Distributed/DistributedBlockOutputStream.h
@@ -38,7 +38,7 @@ class DistributedBlockOutputStream : public IBlockOutputStream
 {
 public:
     DistributedBlockOutputStream(
-        const Context & context_,
+        ContextPtr context_,
         StorageDistributed & storage_,
         const StorageMetadataPtr & metadata_snapshot_,
         const ASTPtr & query_ast_,
@@ -83,8 +83,7 @@ private:
     /// Returns the number of blocks was written for each cluster node. Uses during exception handling.
     std::string getCurrentStateDescription();
 
-private:
-    std::unique_ptr<Context> context;
+    ContextPtr context;
     StorageDistributed & storage;
     StorageMetadataPtr metadata_snapshot;
     ASTPtr query_ast;
@@ -115,7 +114,7 @@ private:
         Block current_shard_block;
 
         ConnectionPool::Entry connection_entry;
-        std::unique_ptr<Context> local_context;
+        ContextPtr local_context;
         BlockOutputStreamPtr stream;
 
         UInt64 blocks_written = 0;
diff --git a/src/Storages/HDFS/StorageHDFS.cpp b/src/Storages/HDFS/StorageHDFS.cpp
index e26d3375c33..392495ff77f 100644
--- a/src/Storages/HDFS/StorageHDFS.cpp
+++ b/src/Storages/HDFS/StorageHDFS.cpp
@@ -40,15 +40,15 @@ StorageHDFS::StorageHDFS(const String & uri_,
     const String & format_name_,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    Context & context_,
+    ContextPtr context_,
     const String & compression_method_ = "")
     : IStorage(table_id_)
+    , WithContext(context_)
     , uri(uri_)
     , format_name(format_name_)
-    , context(context_)
     , compression_method(compression_method_)
 {
-    context.getRemoteHostFilter().checkURL(Poco::URI(uri));
+    context_->getRemoteHostFilter().checkURL(Poco::URI(uri));
 
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -59,7 +59,7 @@ StorageHDFS::StorageHDFS(const String & uri_,
 namespace
 {
 
-class HDFSSource : public SourceWithProgress
+class HDFSSource : public SourceWithProgress, WithContext
 {
 public:
     struct SourcesInfo
@@ -90,16 +90,16 @@ public:
         String format_,
         String compression_method_,
         Block sample_block_,
-        const Context & context_,
+        ContextPtr context_,
         UInt64 max_block_size_)
         : SourceWithProgress(getHeader(sample_block_, source_info_->need_path_column, source_info_->need_file_column))
+        , WithContext(context_)
         , source_info(std::move(source_info_))
         , uri(std::move(uri_))
         , format(std::move(format_))
         , compression_method(compression_method_)
         , max_block_size(max_block_size_)
         , sample_block(std::move(sample_block_))
-        , context(context_)
     {
     }
 
@@ -122,8 +122,8 @@ public:
                 current_path = uri + path;
 
                 auto compression = chooseCompressionMethod(path, compression_method);
-                auto read_buf = wrapReadBufferWithCompressionMethod(std::make_unique<ReadBufferFromHDFS>(current_path, context.getGlobalContext().getConfigRef()), compression);
-                auto input_format = FormatFactory::instance().getInput(format, *read_buf, sample_block, context, max_block_size);
+                auto read_buf = wrapReadBufferWithCompressionMethod(std::make_unique<ReadBufferFromHDFS>(current_path, getContext()->getGlobalContext()->getConfigRef()), compression);
+                auto input_format = FormatFactory::instance().getInput(format, *read_buf, sample_block, getContext(), max_block_size);
                 auto input_stream = std::make_shared<InputStreamFromInputFormat>(input_format);
 
                 reader = std::make_shared<OwningBlockInputStream<ReadBuffer>>(input_stream, std::move(read_buf));
@@ -169,7 +169,6 @@ private:
 
     UInt64 max_block_size;
     Block sample_block;
-    const Context & context;
 };
 
 class HDFSBlockOutputStream : public IBlockOutputStream
@@ -178,11 +177,11 @@ public:
     HDFSBlockOutputStream(const String & uri,
         const String & format,
         const Block & sample_block_,
-        const Context & context,
+        ContextPtr context,
         const CompressionMethod compression_method)
         : sample_block(sample_block_)
     {
-        write_buf = wrapWriteBufferWithCompressionMethod(std::make_unique<WriteBufferFromHDFS>(uri, context.getGlobalContext().getConfigRef()), compression_method, 3);
+        write_buf = wrapWriteBufferWithCompressionMethod(std::make_unique<WriteBufferFromHDFS>(uri, context->getGlobalContext()->getConfigRef()), compression_method, 3);
         writer = FormatFactory::instance().getOutputStreamParallelIfPossible(format, *write_buf, sample_block, context);
     }
 
@@ -267,7 +266,7 @@ Pipe StorageHDFS::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context_,
+    ContextPtr context_,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
@@ -276,7 +275,7 @@ Pipe StorageHDFS::read(
     const String path_from_uri = uri.substr(begin_of_path);
     const String uri_without_path = uri.substr(0, begin_of_path);
 
-    HDFSBuilderWrapper builder = createHDFSBuilder(uri_without_path + "/", context_.getGlobalContext().getConfigRef());
+    HDFSBuilderWrapper builder = createHDFSBuilder(uri_without_path + "/", context_->getGlobalContext()->getConfigRef());
     HDFSFSPtr fs = createHDFSFS(builder.get());
 
     auto sources_info = std::make_shared<HDFSSource::SourcesInfo>();
@@ -302,12 +301,12 @@ Pipe StorageHDFS::read(
     return Pipe::unitePipes(std::move(pipes));
 }
 
-BlockOutputStreamPtr StorageHDFS::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
+BlockOutputStreamPtr StorageHDFS::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/)
 {
     return std::make_shared<HDFSBlockOutputStream>(uri,
         format_name,
         metadata_snapshot->getSampleBlock(),
-        context,
+        getContext(),
         chooseCompressionMethod(uri, compression_method));
 }
 
@@ -321,22 +320,22 @@ void registerStorageHDFS(StorageFactory & factory)
             throw Exception(
                 "Storage HDFS requires 2 or 3 arguments: url, name of used format and optional compression method.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
-        engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.local_context);
+        engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.getLocalContext());
 
         String url = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
 
-        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
+        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.getLocalContext());
 
         String format_name = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
 
         String compression_method;
         if (engine_args.size() == 3)
         {
-            engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.local_context);
+            engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.getLocalContext());
             compression_method = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
         } else compression_method = "auto";
 
-        return StorageHDFS::create(url, args.table_id, format_name, args.columns, args.constraints, args.context, compression_method);
+        return StorageHDFS::create(url, args.table_id, format_name, args.columns, args.constraints, args.getContext(), compression_method);
     },
     {
         .source_access_type = AccessType::HDFS,
diff --git a/src/Storages/HDFS/StorageHDFS.h b/src/Storages/HDFS/StorageHDFS.h
index 4172bce1cd1..0dd57685354 100644
--- a/src/Storages/HDFS/StorageHDFS.h
+++ b/src/Storages/HDFS/StorageHDFS.h
@@ -13,7 +13,7 @@ namespace DB
  * This class represents table engine for external hdfs files.
  * Read method is supported for now.
  */
-class StorageHDFS final : public ext::shared_ptr_helper<StorageHDFS>, public IStorage
+class StorageHDFS final : public ext::shared_ptr_helper<StorageHDFS>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageHDFS>;
 public:
@@ -23,12 +23,12 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     NamesAndTypesList getVirtuals() const override;
 
@@ -38,13 +38,12 @@ protected:
         const String & format_name_,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        Context & context_,
+        ContextPtr context_,
         const String & compression_method_);
 
 private:
     String uri;
     String format_name;
-    Context & context;
     String compression_method;
 
     Poco::Logger * log = &Poco::Logger::get("StorageHDFS");
diff --git a/src/Storages/IStorage.cpp b/src/Storages/IStorage.cpp
index 39f6d1f632e..f7fb359432e 100644
--- a/src/Storages/IStorage.cpp
+++ b/src/Storages/IStorage.cpp
@@ -84,7 +84,7 @@ Pipe IStorage::read(
     const Names & /*column_names*/,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t /*max_block_size*/,
     unsigned /*num_streams*/)
@@ -97,7 +97,7 @@ void IStorage::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned num_streams)
@@ -116,12 +116,12 @@ void IStorage::read(
 }
 
 Pipe IStorage::alterPartition(
-    const StorageMetadataPtr & /* metadata_snapshot */, const PartitionCommands & /* commands */, const Context & /* context */)
+    const StorageMetadataPtr & /* metadata_snapshot */, const PartitionCommands & /* commands */, ContextPtr /* context */)
 {
     throw Exception("Partition operations are not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);
 }
 
-void IStorage::alter(const AlterCommands & params, const Context & context, TableLockHolder &)
+void IStorage::alter(const AlterCommands & params, ContextPtr context, TableLockHolder &)
 {
     auto table_id = getStorageID();
     StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
@@ -131,7 +131,7 @@ void IStorage::alter(const AlterCommands & params, const Context & context, Tabl
 }
 
 
-void IStorage::checkAlterIsPossible(const AlterCommands & commands, const Context & /* context */) const
+void IStorage::checkAlterIsPossible(const AlterCommands & commands, ContextPtr /* context */) const
 {
     for (const auto & command : commands)
     {
@@ -179,7 +179,7 @@ Names IStorage::getAllRegisteredNames() const
     return result;
 }
 
-NameDependencies IStorage::getDependentViewsByColumn(const Context & context) const
+NameDependencies IStorage::getDependentViewsByColumn(ContextPtr context) const
 {
     NameDependencies name_deps;
     auto dependencies = DatabaseCatalog::instance().getDependencies(storage_id);
diff --git a/src/Storages/IStorage.h b/src/Storages/IStorage.h
index b859e654967..e48e9e49919 100644
--- a/src/Storages/IStorage.h
+++ b/src/Storages/IStorage.h
@@ -5,14 +5,15 @@
 #include <DataStreams/IBlockStream_fwd.h>
 #include <Databases/IDatabase.h>
 #include <Interpreters/CancellationCode.h>
-#include <Storages/IStorage_fwd.h>
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/StorageID.h>
-#include <Storages/TableLockHolder.h>
-#include <Storages/CheckResults.h>
-#include <Storages/StorageInMemoryMetadata.h>
-#include <Storages/ColumnDependency.h>
-#include <Storages/SelectQueryDescription.h>
 #include <Processors/QueryPipeline.h>
+#include <Storages/CheckResults.h>
+#include <Storages/ColumnDependency.h>
+#include <Storages/IStorage_fwd.h>
+#include <Storages/SelectQueryDescription.h>
+#include <Storages/StorageInMemoryMetadata.h>
+#include <Storages/TableLockHolder.h>
 #include <Common/ActionLock.h>
 #include <Common/Exception.h>
 #include <Common/RWLock.h>
@@ -30,8 +31,6 @@ namespace ErrorCodes
     extern const int NOT_IMPLEMENTED;
 }
 
-class Context;
-
 using StorageActionBlockType = size_t;
 
 class ASTCreateQuery;
@@ -181,7 +180,7 @@ public:
 
     Names getAllRegisteredNames() const override;
 
-    NameDependencies getDependentViewsByColumn(const Context & context) const;
+    NameDependencies getDependentViewsByColumn(ContextPtr context) const;
 
 protected:
     /// Returns whether the column is virtual - by default all columns are real.
@@ -231,7 +230,7 @@ public:
       * QueryProcessingStage::Enum required for Distributed over Distributed,
       * since it cannot return Complete for intermediate queries never.
       */
-    virtual QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const
+    virtual QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const
     {
         return QueryProcessingStage::FetchColumns;
     }
@@ -258,7 +257,7 @@ public:
     virtual BlockInputStreams watch(
         const Names & /*column_names*/,
         const SelectQueryInfo & /*query_info*/,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum & /*processed_stage*/,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/)
@@ -290,7 +289,7 @@ public:
         const Names & /*column_names*/,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & /*query_info*/,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/);
@@ -302,7 +301,7 @@ public:
         const Names & /*column_names*/,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & /*query_info*/,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/);
@@ -319,7 +318,7 @@ public:
     virtual BlockOutputStreamPtr write(
         const ASTPtr & /*query*/,
         const StorageMetadataPtr & /*metadata_snapshot*/,
-        const Context & /*context*/)
+        ContextPtr /*context*/)
     {
         throw Exception("Method write is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);
     }
@@ -332,7 +331,7 @@ public:
       */
     virtual QueryPipelinePtr distributedWrite(
         const ASTInsertQuery & /*query*/,
-        const Context & /*context*/)
+        ContextPtr /*context*/)
     {
         return nullptr;
     }
@@ -351,7 +350,7 @@ public:
     virtual void truncate(
         const ASTPtr & /*query*/,
         const StorageMetadataPtr & /* metadata_snapshot */,
-        const Context & /* context */,
+        ContextPtr /* context */,
         TableExclusiveLockHolder &)
     {
         throw Exception("Truncate is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);
@@ -379,12 +378,12 @@ public:
     /** ALTER tables in the form of column changes that do not affect the change
       * to Storage or its parameters. Executes under alter lock (lockForAlter).
       */
-    virtual void alter(const AlterCommands & params, const Context & context, TableLockHolder & alter_lock_holder);
+    virtual void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & alter_lock_holder);
 
     /** Checks that alter commands can be applied to storage. For example, columns can be modified,
       * or primary key can be changes, etc.
       */
-    virtual void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const;
+    virtual void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const;
 
     /**
       * Checks that mutation commands can be applied to storage.
@@ -397,7 +396,7 @@ public:
     virtual Pipe alterPartition(
         const StorageMetadataPtr & /* metadata_snapshot */,
         const PartitionCommands & /* commands */,
-        const Context & /* context */);
+        ContextPtr /* context */);
 
     /// Checks that partition commands can be applied to storage.
     virtual void checkAlterPartitionIsPossible(const PartitionCommands & commands, const StorageMetadataPtr & metadata_snapshot, const Settings & settings) const;
@@ -412,13 +411,13 @@ public:
         bool /*final*/,
         bool /*deduplicate*/,
         const Names & /* deduplicate_by_columns */,
-        const Context & /*context*/)
+        ContextPtr /*context*/)
     {
         throw Exception("Method optimize is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);
     }
 
     /// Mutate the table contents
-    virtual void mutate(const MutationCommands &, const Context &)
+    virtual void mutate(const MutationCommands &, ContextPtr)
     {
         throw Exception("Mutations are not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);
     }
@@ -462,10 +461,10 @@ public:
     virtual bool supportsIndexForIn() const { return false; }
 
     /// Provides a hint that the storage engine may evaluate the IN-condition by using an index.
-    virtual bool mayBenefitFromIndexForIn(const ASTPtr & /* left_in_operand */, const Context & /* query_context */, const StorageMetadataPtr & /* metadata_snapshot */) const { return false; }
+    virtual bool mayBenefitFromIndexForIn(const ASTPtr & /* left_in_operand */, ContextPtr /* query_context */, const StorageMetadataPtr & /* metadata_snapshot */) const { return false; }
 
     /// Checks validity of the data
-    virtual CheckResults checkData(const ASTPtr & /* query */, const Context & /* context */) { throw Exception("Check query is not supported for " + getName() + " storage", ErrorCodes::NOT_IMPLEMENTED); }
+    virtual CheckResults checkData(const ASTPtr & /* query */, ContextPtr /* context */) { throw Exception("Check query is not supported for " + getName() + " storage", ErrorCodes::NOT_IMPLEMENTED); }
 
     /// Checks that table could be dropped right now
     /// Otherwise - throws an exception with detailed information.
@@ -498,7 +497,7 @@ public:
     virtual std::optional<UInt64> totalRows(const Settings &) const { return {}; }
 
     /// Same as above but also take partition predicate into account.
-    virtual std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo &, const Context &) const { return {}; }
+    virtual std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo &, ContextPtr) const { return {}; }
 
     /// If it is possible to quickly determine exact number of bytes for the table on storage:
     /// - memory (approximated, resident)
diff --git a/src/Storages/IndicesDescription.cpp b/src/Storages/IndicesDescription.cpp
index dbc95615383..3147ad70696 100644
--- a/src/Storages/IndicesDescription.cpp
+++ b/src/Storages/IndicesDescription.cpp
@@ -67,7 +67,7 @@ IndexDescription & IndexDescription::operator=(const IndexDescription & other)
     return *this;
 }
 
-IndexDescription IndexDescription::getIndexFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, const Context & context)
+IndexDescription IndexDescription::getIndexFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, ContextPtr context)
 {
     const auto * index_definition = definition_ast->as<ASTIndexDeclaration>();
     if (!index_definition)
@@ -118,7 +118,7 @@ IndexDescription IndexDescription::getIndexFromAST(const ASTPtr & definition_ast
     return result;
 }
 
-void IndexDescription::recalculateWithNewColumns(const ColumnsDescription & new_columns, const Context & context)
+void IndexDescription::recalculateWithNewColumns(const ColumnsDescription & new_columns, ContextPtr context)
 {
     *this = getIndexFromAST(definition_ast, new_columns, context);
 }
@@ -144,7 +144,7 @@ String IndicesDescription::toString() const
 }
 
 
-IndicesDescription IndicesDescription::parse(const String & str, const ColumnsDescription & columns, const Context & context)
+IndicesDescription IndicesDescription::parse(const String & str, const ColumnsDescription & columns, ContextPtr context)
 {
     IndicesDescription result;
     if (str.empty())
@@ -160,7 +160,7 @@ IndicesDescription IndicesDescription::parse(const String & str, const ColumnsDe
 }
 
 
-ExpressionActionsPtr IndicesDescription::getSingleExpressionForIndices(const ColumnsDescription & columns, const Context & context) const
+ExpressionActionsPtr IndicesDescription::getSingleExpressionForIndices(const ColumnsDescription & columns, ContextPtr context) const
 {
     ASTPtr combined_expr_list = std::make_shared<ASTExpressionList>();
     for (const auto & index : *this)
diff --git a/src/Storages/IndicesDescription.h b/src/Storages/IndicesDescription.h
index f383029837e..d9c7efdb75c 100644
--- a/src/Storages/IndicesDescription.h
+++ b/src/Storages/IndicesDescription.h
@@ -46,7 +46,7 @@ struct IndexDescription
     size_t granularity;
 
     /// Parse index from definition AST
-    static IndexDescription getIndexFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, const Context & context);
+    static IndexDescription getIndexFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, ContextPtr context);
 
     IndexDescription() = default;
 
@@ -57,7 +57,7 @@ struct IndexDescription
 
     /// Recalculate index with new columns because index expression may change
     /// if something change in columns.
-    void recalculateWithNewColumns(const ColumnsDescription & new_columns, const Context & context);
+    void recalculateWithNewColumns(const ColumnsDescription & new_columns, ContextPtr context);
 };
 
 /// All secondary indices in storage
@@ -68,10 +68,10 @@ struct IndicesDescription : public std::vector<IndexDescription>
     /// Convert description to string
     String toString() const;
     /// Parse description from string
-    static IndicesDescription parse(const String & str, const ColumnsDescription & columns, const Context & context);
+    static IndicesDescription parse(const String & str, const ColumnsDescription & columns, ContextPtr context);
 
     /// Return common expression for all stored indices
-    ExpressionActionsPtr getSingleExpressionForIndices(const ColumnsDescription & columns, const Context & context) const;
+    ExpressionActionsPtr getSingleExpressionForIndices(const ColumnsDescription & columns, ContextPtr context) const;
 };
 
 }
diff --git a/src/Storages/Kafka/KafkaBlockInputStream.cpp b/src/Storages/Kafka/KafkaBlockInputStream.cpp
index 6b6158ff62a..5d9b19b1972 100644
--- a/src/Storages/Kafka/KafkaBlockInputStream.cpp
+++ b/src/Storages/Kafka/KafkaBlockInputStream.cpp
@@ -84,7 +84,7 @@ Block KafkaBlockInputStream::readImpl()
     auto put_error_to_stream = handle_error_mode == HandleKafkaErrorMode::STREAM;
 
     auto input_format = FormatFactory::instance().getInputFormat(
-        storage.getFormatName(), *buffer, non_virtual_header, *context, max_block_size);
+        storage.getFormatName(), *buffer, non_virtual_header, context, max_block_size);
 
     InputPort port(input_format->getPort().getHeader(), input_format.get());
     connect(input_format->getPort(), port);
diff --git a/src/Storages/Kafka/KafkaBlockInputStream.h b/src/Storages/Kafka/KafkaBlockInputStream.h
index c77f17803e7..98e4b8982e0 100644
--- a/src/Storages/Kafka/KafkaBlockInputStream.h
+++ b/src/Storages/Kafka/KafkaBlockInputStream.h
@@ -39,7 +39,7 @@ public:
 private:
     StorageKafka & storage;
     StorageMetadataPtr metadata_snapshot;
-    const std::shared_ptr<Context> context;
+    ContextPtr context;
     Names column_names;
     Poco::Logger * log;
     UInt64 max_block_size;
diff --git a/src/Storages/Kafka/KafkaBlockOutputStream.cpp b/src/Storages/Kafka/KafkaBlockOutputStream.cpp
index 2cb0fd98c71..21de27708b4 100644
--- a/src/Storages/Kafka/KafkaBlockOutputStream.cpp
+++ b/src/Storages/Kafka/KafkaBlockOutputStream.cpp
@@ -9,7 +9,7 @@ namespace DB
 KafkaBlockOutputStream::KafkaBlockOutputStream(
     StorageKafka & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
-    const std::shared_ptr<Context> & context_)
+    const ContextPtr & context_)
     : storage(storage_)
     , metadata_snapshot(metadata_snapshot_)
     , context(context_)
@@ -25,11 +25,11 @@ void KafkaBlockOutputStream::writePrefix()
 {
     buffer = storage.createWriteBuffer(getHeader());
 
-    auto format_settings = getFormatSettings(*context);
+    auto format_settings = getFormatSettings(context);
     format_settings.protobuf.allow_multiple_rows_without_delimiter = true;
 
     child = FormatFactory::instance().getOutputStream(storage.getFormatName(), *buffer,
-        getHeader(), *context,
+        getHeader(), context,
         [this](const Columns & columns, size_t row)
         {
             buffer->countRow(columns, row);
diff --git a/src/Storages/Kafka/StorageKafka.cpp b/src/Storages/Kafka/StorageKafka.cpp
index 88bc177ef0b..e2b5ce7c325 100644
--- a/src/Storages/Kafka/StorageKafka.cpp
+++ b/src/Storages/Kafka/StorageKafka.cpp
@@ -169,20 +169,19 @@ namespace
 }
 
 StorageKafka::StorageKafka(
-    const StorageID & table_id_,
-    const Context & context_,
-    const ColumnsDescription & columns_,
-    std::unique_ptr<KafkaSettings> kafka_settings_)
+    const StorageID & table_id_, ContextPtr context_, const ColumnsDescription & columns_, std::unique_ptr<KafkaSettings> kafka_settings_)
     : IStorage(table_id_)
-    , global_context(context_.getGlobalContext())
+    , WithContext(context_->getGlobalContext())
     , kafka_settings(std::move(kafka_settings_))
-    , topics(parseTopics(global_context.getMacros()->expand(kafka_settings->kafka_topic_list.value)))
-    , brokers(global_context.getMacros()->expand(kafka_settings->kafka_broker_list.value))
-    , group(global_context.getMacros()->expand(kafka_settings->kafka_group_name.value))
-    , client_id(kafka_settings->kafka_client_id.value.empty() ? getDefaultClientId(table_id_) : global_context.getMacros()->expand(kafka_settings->kafka_client_id.value))
-    , format_name(global_context.getMacros()->expand(kafka_settings->kafka_format.value))
+    , topics(parseTopics(getContext()->getMacros()->expand(kafka_settings->kafka_topic_list.value)))
+    , brokers(getContext()->getMacros()->expand(kafka_settings->kafka_broker_list.value))
+    , group(getContext()->getMacros()->expand(kafka_settings->kafka_group_name.value))
+    , client_id(
+          kafka_settings->kafka_client_id.value.empty() ? getDefaultClientId(table_id_)
+                                                        : getContext()->getMacros()->expand(kafka_settings->kafka_client_id.value))
+    , format_name(getContext()->getMacros()->expand(kafka_settings->kafka_format.value))
     , row_delimiter(kafka_settings->kafka_row_delimiter.value)
-    , schema_name(global_context.getMacros()->expand(kafka_settings->kafka_schema.value))
+    , schema_name(getContext()->getMacros()->expand(kafka_settings->kafka_schema.value))
     , num_consumers(kafka_settings->kafka_num_consumers.value)
     , log(&Poco::Logger::get("StorageKafka (" + table_id_.table_name + ")"))
     , semaphore(0, num_consumers)
@@ -201,7 +200,7 @@ StorageKafka::StorageKafka(
     auto task_count = thread_per_consumer ? num_consumers : 1;
     for (size_t i = 0; i < task_count; ++i)
     {
-        auto task = global_context.getMessageBrokerSchedulePool().createTask(log->name(), [this, i]{ threadFunc(i); });
+        auto task = getContext()->getMessageBrokerSchedulePool().createTask(log->name(), [this, i]{ threadFunc(i); });
         task->deactivate();
         tasks.emplace_back(std::make_shared<TaskContext>(std::move(task)));
     }
@@ -260,7 +259,7 @@ Pipe StorageKafka::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /* query_info */,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum /* processed_stage */,
     size_t /* max_block_size */,
     unsigned /* num_streams */)
@@ -271,7 +270,7 @@ Pipe StorageKafka::read(
     /// Always use all consumers at once, otherwise SELECT may not read messages from all partitions.
     Pipes pipes;
     pipes.reserve(num_created_consumers);
-    auto modified_context = std::make_shared<Context>(context);
+    auto modified_context = Context::createCopy(local_context);
     modified_context->applySettingsChanges(settings_adjustments);
 
     // Claim as many consumers as requested, but don't block
@@ -289,9 +288,9 @@ Pipe StorageKafka::read(
 }
 
 
-BlockOutputStreamPtr StorageKafka::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageKafka::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
-    auto modified_context = std::make_shared<Context>(context);
+    auto modified_context = Context::createCopy(local_context);
     modified_context->applySettingsChanges(settings_adjustments);
 
     if (topics.size() > 1)
@@ -387,7 +386,7 @@ ProducerBufferPtr StorageKafka::createWriteBuffer(const Block & header)
     updateConfiguration(conf);
 
     auto producer = std::make_shared<cppkafka::Producer>(conf);
-    const Settings & settings = global_context.getSettingsRef();
+    const Settings & settings = getContext()->getSettingsRef();
     size_t poll_timeout = settings.stream_poll_timeout_ms.totalMilliseconds();
 
     return std::make_shared<WriteBufferToKafkaProducer>(
@@ -443,14 +442,14 @@ size_t StorageKafka::getMaxBlockSize() const
 {
     return kafka_settings->kafka_max_block_size.changed
         ? kafka_settings->kafka_max_block_size.value
-        : (global_context.getSettingsRef().max_insert_block_size.value / num_consumers);
+        : (getContext()->getSettingsRef().max_insert_block_size.value / num_consumers);
 }
 
 size_t StorageKafka::getPollMaxBatchSize() const
 {
     size_t batch_size = kafka_settings->kafka_poll_max_batch_size.changed
                         ? kafka_settings->kafka_poll_max_batch_size.value
-                        : global_context.getSettingsRef().max_block_size.value;
+                        : getContext()->getSettingsRef().max_block_size.value;
 
     return std::min(batch_size,getMaxBlockSize());
 }
@@ -459,13 +458,13 @@ size_t StorageKafka::getPollTimeoutMillisecond() const
 {
     return kafka_settings->kafka_poll_timeout_ms.changed
         ? kafka_settings->kafka_poll_timeout_ms.totalMilliseconds()
-        : global_context.getSettingsRef().stream_poll_timeout_ms.totalMilliseconds();
+        : getContext()->getSettingsRef().stream_poll_timeout_ms.totalMilliseconds();
 }
 
 void StorageKafka::updateConfiguration(cppkafka::Configuration & conf)
 {
     // Update consumer configuration from the configuration
-    const auto & config = global_context.getConfigRef();
+    const auto & config = getContext()->getConfigRef();
     if (config.has(CONFIG_PREFIX))
         loadFromConfig(conf, config, CONFIG_PREFIX);
 
@@ -517,7 +516,7 @@ bool StorageKafka::checkDependencies(const StorageID & table_id)
     // Check the dependencies are ready?
     for (const auto & db_tab : dependencies)
     {
-        auto table = DatabaseCatalog::instance().tryGetTable(db_tab, global_context);
+        auto table = DatabaseCatalog::instance().tryGetTable(db_tab, getContext());
         if (!table)
             return false;
 
@@ -587,7 +586,7 @@ void StorageKafka::threadFunc(size_t idx)
 bool StorageKafka::streamToViews()
 {
     auto table_id = getStorageID();
-    auto table = DatabaseCatalog::instance().getTable(table_id, global_context);
+    auto table = DatabaseCatalog::instance().getTable(table_id, getContext());
     if (!table)
         throw Exception("Engine table " + table_id.getNameForLogs() + " doesn't exist.", ErrorCodes::LOGICAL_ERROR);
     auto metadata_snapshot = getInMemoryMetadataPtr();
@@ -598,13 +597,13 @@ bool StorageKafka::streamToViews()
 
     size_t block_size = getMaxBlockSize();
 
-    auto kafka_context = std::make_shared<Context>(global_context);
+    auto kafka_context = Context::createCopy(getContext());
     kafka_context->makeQueryContext();
     kafka_context->applySettingsChanges(settings_adjustments);
 
     // Create a stream for each consumer and join them in a union stream
     // Only insert into dependent views and expect that input blocks contain virtual columns
-    InterpreterInsertQuery interpreter(insert, *kafka_context, false, true, true);
+    InterpreterInsertQuery interpreter(insert, kafka_context, false, true, true);
     auto block_io = interpreter.execute();
 
     // Create a stream for each consumer and join them in a union stream
@@ -622,7 +621,7 @@ bool StorageKafka::streamToViews()
 
         limits.speed_limits.max_execution_time = kafka_settings->kafka_flush_interval_ms.changed
                                                  ? kafka_settings->kafka_flush_interval_ms
-                                                 : global_context.getSettingsRef().stream_flush_interval_ms;
+                                                 : getContext()->getSettingsRef().stream_flush_interval_ms;
 
         limits.timeout_overflow_mode = OverflowMode::BREAK;
         stream->setLimits(limits);
@@ -695,14 +694,14 @@ void registerStorageKafka(StorageFactory & factory)
                         engine_args[(ARG_NUM)-1] =                          \
                             evaluateConstantExpressionAsLiteral(            \
                                 engine_args[(ARG_NUM)-1],                   \
-                                args.local_context);                        \
+                                args.getLocalContext());                    \
                     }                                                       \
                     if ((EVAL) == 2)                                        \
                     {                                                       \
                         engine_args[(ARG_NUM)-1] =                          \
                            evaluateConstantExpressionOrIdentifierAsLiteral( \
                                 engine_args[(ARG_NUM)-1],                   \
-                                args.local_context);                        \
+                                args.getLocalContext());                    \
                     }                                                       \
                     kafka_settings->PAR_NAME =                              \
                         engine_args[(ARG_NUM)-1]->as<ASTLiteral &>().value; \
@@ -757,7 +756,7 @@ void registerStorageKafka(StorageFactory & factory)
             throw Exception("kafka_poll_max_batch_size can not be lower than 1", ErrorCodes::BAD_ARGUMENTS);
         }
 
-        return StorageKafka::create(args.table_id, args.context, args.columns, std::move(kafka_settings));
+        return StorageKafka::create(args.table_id, args.getContext(), args.columns, std::move(kafka_settings));
     };
 
     factory.registerStorage("Kafka", creator_fn, StorageFactory::StorageFeatures{ .supports_settings = true, });
diff --git a/src/Storages/Kafka/StorageKafka.h b/src/Storages/Kafka/StorageKafka.h
index 74526ed3c87..b09b2ecd39e 100644
--- a/src/Storages/Kafka/StorageKafka.h
+++ b/src/Storages/Kafka/StorageKafka.h
@@ -28,7 +28,7 @@ struct StorageKafkaInterceptors;
 /** Implements a Kafka queue table engine that can be used as a persistent queue / buffer,
   * or as a basic building block for creating pipelines with a continuous insertion / ETL.
   */
-class StorageKafka final : public ext::shared_ptr_helper<StorageKafka>, public IStorage
+class StorageKafka final : public ext::shared_ptr_helper<StorageKafka>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageKafka>;
     friend struct StorageKafkaInterceptors;
@@ -45,7 +45,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -53,7 +53,7 @@ public:
     BlockOutputStreamPtr write(
         const ASTPtr & query,
         const StorageMetadataPtr & /*metadata_snapshot*/,
-        const Context & context) override;
+        ContextPtr context) override;
 
     void pushReadBuffer(ConsumerBufferPtr buf);
     ConsumerBufferPtr popReadBuffer();
@@ -69,13 +69,12 @@ public:
 protected:
     StorageKafka(
         const StorageID & table_id_,
-        const Context & context_,
+        ContextPtr context_,
         const ColumnsDescription & columns_,
         std::unique_ptr<KafkaSettings> kafka_settings_);
 
 private:
     // Configuration and state
-    const Context & global_context;
     std::unique_ptr<KafkaSettings> kafka_settings;
     const Names topics;
     const String brokers;
diff --git a/src/Storages/KeyDescription.cpp b/src/Storages/KeyDescription.cpp
index ee4a20bfc4f..be327313b4d 100644
--- a/src/Storages/KeyDescription.cpp
+++ b/src/Storages/KeyDescription.cpp
@@ -66,14 +66,14 @@ KeyDescription & KeyDescription::operator=(const KeyDescription & other)
 void KeyDescription::recalculateWithNewAST(
     const ASTPtr & new_ast,
     const ColumnsDescription & columns,
-    const Context & context)
+    ContextPtr context)
 {
     *this = getSortingKeyFromAST(new_ast, columns, context, additional_column);
 }
 
 void KeyDescription::recalculateWithNewColumns(
     const ColumnsDescription & new_columns,
-    const Context & context)
+    ContextPtr context)
 {
     *this = getSortingKeyFromAST(definition_ast, new_columns, context, additional_column);
 }
@@ -81,7 +81,7 @@ void KeyDescription::recalculateWithNewColumns(
 KeyDescription KeyDescription::getKeyFromAST(
     const ASTPtr & definition_ast,
     const ColumnsDescription & columns,
-    const Context & context)
+    ContextPtr context)
 {
     return getSortingKeyFromAST(definition_ast, columns, context, {});
 }
@@ -89,7 +89,7 @@ KeyDescription KeyDescription::getKeyFromAST(
 KeyDescription KeyDescription::getSortingKeyFromAST(
     const ASTPtr & definition_ast,
     const ColumnsDescription & columns,
-    const Context & context,
+    ContextPtr context,
     const std::optional<String> & additional_column)
 {
     KeyDescription result;
diff --git a/src/Storages/KeyDescription.h b/src/Storages/KeyDescription.h
index 7d1e7efb55f..194aad4d5b2 100644
--- a/src/Storages/KeyDescription.h
+++ b/src/Storages/KeyDescription.h
@@ -40,28 +40,28 @@ struct KeyDescription
     static KeyDescription getKeyFromAST(
         const ASTPtr & definition_ast,
         const ColumnsDescription & columns,
-        const Context & context);
+        ContextPtr context);
 
     /// Sorting key can contain additional column defined by storage type (like
     /// Version column in VersionedCollapsingMergeTree).
     static KeyDescription getSortingKeyFromAST(
         const ASTPtr & definition_ast,
         const ColumnsDescription & columns,
-        const Context & context,
+        ContextPtr context,
         const std::optional<String> & additional_column);
 
     /// Recalculate all expressions and fields for key with new columns without
     /// changes in constant fields. Just wrapper for static methods.
     void recalculateWithNewColumns(
         const ColumnsDescription & new_columns,
-        const Context & context);
+        ContextPtr context);
 
     /// Recalculate all expressions and fields for key with new ast without
     /// changes in constant fields. Just wrapper for static methods.
     void recalculateWithNewAST(
         const ASTPtr & new_ast,
         const ColumnsDescription & columns,
-        const Context & context);
+        ContextPtr context);
 
     KeyDescription() = default;
 
diff --git a/src/Storages/LiveView/StorageBlocks.h b/src/Storages/LiveView/StorageBlocks.h
index 4ad0ffb93ca..f4ba8d7b09c 100644
--- a/src/Storages/LiveView/StorageBlocks.h
+++ b/src/Storages/LiveView/StorageBlocks.h
@@ -33,13 +33,13 @@ public:
     bool supportsSampling() const override { return true; }
     bool supportsFinal() const override { return true; }
 
-    QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override { return to_stage; }
+    QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override { return to_stage; }
 
     Pipe read(
         const Names & /*column_names*/,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & /*query_info*/,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/) override
diff --git a/src/Storages/LiveView/StorageLiveView.cpp b/src/Storages/LiveView/StorageLiveView.cpp
index bfec7bffc8c..1d81405ec26 100644
--- a/src/Storages/LiveView/StorageLiveView.cpp
+++ b/src/Storages/LiveView/StorageLiveView.cpp
@@ -56,13 +56,13 @@ namespace ErrorCodes
 }
 
 
-static StorageID extractDependentTable(ASTPtr & query, Context & context, const String & table_name, ASTPtr & inner_subquery)
+static StorageID extractDependentTable(ASTPtr & query, ContextPtr context, const String & table_name, ASTPtr & inner_subquery)
 {
     ASTSelectQuery & select_query = typeid_cast<ASTSelectQuery &>(*query);
 
     if (auto db_and_table = getDatabaseAndTable(select_query, 0))
     {
-        String select_database_name = context.getCurrentDatabase();
+        String select_database_name = context->getCurrentDatabase();
         String select_table_name = db_and_table->table;
 
         if (db_and_table->database.empty())
@@ -98,7 +98,7 @@ static StorageID extractDependentTable(ASTPtr & query, Context & context, const
     }
 }
 
-MergeableBlocksPtr StorageLiveView::collectMergeableBlocks(const Context & context)
+MergeableBlocksPtr StorageLiveView::collectMergeableBlocks(ContextPtr local_context)
 {
     ASTPtr mergeable_query = inner_query;
 
@@ -109,7 +109,7 @@ MergeableBlocksPtr StorageLiveView::collectMergeableBlocks(const Context & conte
     BlocksPtrs new_blocks = std::make_shared<std::vector<BlocksPtr>>();
     BlocksPtr base_blocks = std::make_shared<Blocks>();
 
-    InterpreterSelectQuery interpreter(mergeable_query->clone(), context, SelectQueryOptions(QueryProcessingStage::WithMergeableState), Names());
+    InterpreterSelectQuery interpreter(mergeable_query->clone(), local_context, SelectQueryOptions(QueryProcessingStage::WithMergeableState), Names());
 
     auto view_mergeable_stream = std::make_shared<MaterializingBlockInputStream>(interpreter.execute().getInputStream());
 
@@ -137,7 +137,7 @@ Pipes StorageLiveView::blocksToPipes(BlocksPtrs blocks, Block & sample_block)
 BlockInputStreamPtr StorageLiveView::completeQuery(Pipes pipes)
 {
     //FIXME it's dangerous to create Context on stack
-    auto block_context = std::make_unique<Context>(global_context);
+    auto block_context = Context::createCopy(getContext());
     block_context->makeQueryContext();
 
     auto creator = [&](const StorageID & blocks_id_global)
@@ -147,17 +147,17 @@ BlockInputStreamPtr StorageLiveView::completeQuery(Pipes pipes)
             blocks_id_global, parent_table_metadata->getColumns(),
             std::move(pipes), QueryProcessingStage::WithMergeableState);
     };
-    block_context->addExternalTable(getBlocksTableName(), TemporaryTableHolder(global_context, creator));
+    block_context->addExternalTable(getBlocksTableName(), TemporaryTableHolder(getContext(), creator));
 
-    InterpreterSelectQuery select(getInnerBlocksQuery(), *block_context, StoragePtr(), nullptr, SelectQueryOptions(QueryProcessingStage::Complete));
+    InterpreterSelectQuery select(getInnerBlocksQuery(), block_context, StoragePtr(), nullptr, SelectQueryOptions(QueryProcessingStage::Complete));
     BlockInputStreamPtr data = std::make_shared<MaterializingBlockInputStream>(select.execute().getInputStream());
 
     /// Squashing is needed here because the view query can generate a lot of blocks
     /// even when only one block is inserted into the parent table (e.g. if the query is a GROUP BY
     /// and two-level aggregation is triggered).
     data = std::make_shared<SquashingBlockInputStream>(
-        data, global_context.getSettingsRef().min_insert_block_size_rows,
-        global_context.getSettingsRef().min_insert_block_size_bytes);
+        data, getContext()->getSettingsRef().min_insert_block_size_rows,
+        getContext()->getSettingsRef().min_insert_block_size_bytes);
 
     return data;
 }
@@ -165,7 +165,7 @@ BlockInputStreamPtr StorageLiveView::completeQuery(Pipes pipes)
 void StorageLiveView::writeIntoLiveView(
     StorageLiveView & live_view,
     const Block & block,
-    const Context & context)
+    ContextPtr local_context)
 {
     BlockOutputStreamPtr output = std::make_shared<LiveViewBlockOutputStream>(live_view);
 
@@ -190,9 +190,9 @@ void StorageLiveView::writeIntoLiveView(
         std::lock_guard lock(live_view.mutex);
 
         mergeable_blocks = live_view.getMergeableBlocks();
-        if (!mergeable_blocks || mergeable_blocks->blocks->size() >= context.getGlobalContext().getSettingsRef().max_live_view_insert_blocks_before_refresh)
+        if (!mergeable_blocks || mergeable_blocks->blocks->size() >= local_context->getGlobalContext()->getSettingsRef().max_live_view_insert_blocks_before_refresh)
         {
-            mergeable_blocks = live_view.collectMergeableBlocks(context);
+            mergeable_blocks = live_view.collectMergeableBlocks(local_context);
             live_view.setMergeableBlocks(mergeable_blocks);
             from = live_view.blocksToPipes(mergeable_blocks->blocks, mergeable_blocks->sample_block);
             is_block_processed = true;
@@ -216,9 +216,9 @@ void StorageLiveView::writeIntoLiveView(
                 blocks_id_global, parent_metadata->getColumns(),
                 std::move(pipes), QueryProcessingStage::FetchColumns);
         };
-        TemporaryTableHolder blocks_storage(context, creator);
+        TemporaryTableHolder blocks_storage(local_context, creator);
 
-        InterpreterSelectQuery select_block(mergeable_query, context, blocks_storage.getTable(), blocks_storage.getTable()->getInMemoryMetadataPtr(),
+        InterpreterSelectQuery select_block(mergeable_query, local_context, blocks_storage.getTable(), blocks_storage.getTable()->getInMemoryMetadataPtr(),
             QueryProcessingStage::WithMergeableState);
 
         auto data_mergeable_stream = std::make_shared<MaterializingBlockInputStream>(
@@ -246,13 +246,13 @@ void StorageLiveView::writeIntoLiveView(
 
 StorageLiveView::StorageLiveView(
     const StorageID & table_id_,
-    Context & local_context,
+    ContextPtr context_,
     const ASTCreateQuery & query,
     const ColumnsDescription & columns_)
     : IStorage(table_id_)
-    , global_context(local_context.getGlobalContext())
+    , WithContext(context_->getGlobalContext())
 {
-    live_view_context = std::make_unique<Context>(global_context);
+    live_view_context = Context::createCopy(getContext());
     live_view_context->makeQueryContext();
 
     log = &Poco::Logger::get("StorageLiveView (" + table_id_.database_name + "." + table_id_.table_name + ")");
@@ -271,7 +271,7 @@ StorageLiveView::StorageLiveView(
     inner_query = query.select->list_of_selects->children.at(0);
 
     auto inner_query_tmp = inner_query->clone();
-    select_table_id = extractDependentTable(inner_query_tmp, global_context, table_id_.table_name, inner_subquery);
+    select_table_id = extractDependentTable(inner_query_tmp, getContext(), table_id_.table_name, inner_subquery);
 
     DatabaseCatalog::instance().addDependency(select_table_id, table_id_);
 
@@ -291,7 +291,7 @@ StorageLiveView::StorageLiveView(
     blocks_metadata_ptr = std::make_shared<BlocksMetadataPtr>();
     active_ptr = std::make_shared<bool>(true);
 
-    periodic_refresh_task = global_context.getSchedulePool().createTask("LieViewPeriodicRefreshTask", [this]{ periodicRefreshTaskFunc(); });
+    periodic_refresh_task = getContext()->getSchedulePool().createTask("LieViewPeriodicRefreshTask", [this]{ periodicRefreshTaskFunc(); });
     periodic_refresh_task->deactivate();
 }
 
@@ -301,7 +301,7 @@ Block StorageLiveView::getHeader() const
 
     if (!sample_block)
     {
-        sample_block = InterpreterSelectQuery(inner_query->clone(), *live_view_context, SelectQueryOptions(QueryProcessingStage::Complete)).getSampleBlock();
+        sample_block = InterpreterSelectQuery(inner_query->clone(), live_view_context, SelectQueryOptions(QueryProcessingStage::Complete)).getSampleBlock();
         sample_block.insert({DataTypeUInt64().createColumnConst(
             sample_block.rows(), 0)->convertToFullColumnIfConst(),
             std::make_shared<DataTypeUInt64>(),
@@ -318,7 +318,7 @@ Block StorageLiveView::getHeader() const
 
 StoragePtr StorageLiveView::getParentStorage() const
 {
-    return DatabaseCatalog::instance().getTable(select_table_id, global_context);
+    return DatabaseCatalog::instance().getTable(select_table_id, getContext());
 }
 
 ASTPtr StorageLiveView::getInnerBlocksQuery()
@@ -330,9 +330,9 @@ ASTPtr StorageLiveView::getInnerBlocksQuery()
         /// Rewrite inner query with right aliases for JOIN.
         /// It cannot be done in constructor or startup() because InterpreterSelectQuery may access table,
         /// which is not loaded yet during server startup, so we do it lazily
-        InterpreterSelectQuery(inner_blocks_query, *live_view_context, SelectQueryOptions().modify().analyze()); // NOLINT
+        InterpreterSelectQuery(inner_blocks_query, live_view_context, SelectQueryOptions().modify().analyze()); // NOLINT
         auto table_id = getStorageID();
-        extractDependentTable(inner_blocks_query, global_context, table_id.table_name, inner_subquery);
+        extractDependentTable(inner_blocks_query, getContext(), table_id.table_name, inner_subquery);
     }
     return inner_blocks_query->clone();
 }
@@ -350,7 +350,7 @@ bool StorageLiveView::getNewBlocks()
     /// called before writeIntoLiveView function is called which can lead to
     /// the same block added twice to the mergeable_blocks leading to
     /// inserted data to be duplicated
-    auto new_mergeable_blocks = collectMergeableBlocks(*live_view_context);
+    auto new_mergeable_blocks = collectMergeableBlocks(live_view_context);
     Pipes from = blocksToPipes(new_mergeable_blocks->blocks, new_mergeable_blocks->sample_block);
     BlockInputStreamPtr data = completeQuery(std::move(from));
 
@@ -500,7 +500,7 @@ Pipe StorageLiveView::read(
     const Names & /*column_names*/,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
@@ -525,7 +525,7 @@ Pipe StorageLiveView::read(
 BlockInputStreams StorageLiveView::watch(
     const Names & /*column_names*/,
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum & processed_stage,
     size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
@@ -546,12 +546,12 @@ BlockInputStreams StorageLiveView::watch(
         reader = std::make_shared<LiveViewEventsBlockInputStream>(
             std::static_pointer_cast<StorageLiveView>(shared_from_this()),
             blocks_ptr, blocks_metadata_ptr, active_ptr, has_limit, limit,
-            context.getSettingsRef().live_view_heartbeat_interval.totalSeconds());
+            local_context->getSettingsRef().live_view_heartbeat_interval.totalSeconds());
     else
         reader = std::make_shared<LiveViewBlockInputStream>(
             std::static_pointer_cast<StorageLiveView>(shared_from_this()),
             blocks_ptr, blocks_metadata_ptr, active_ptr, has_limit, limit,
-            context.getSettingsRef().live_view_heartbeat_interval.totalSeconds());
+            local_context->getSettingsRef().live_view_heartbeat_interval.totalSeconds());
 
     {
         std::lock_guard lock(mutex);
@@ -578,10 +578,12 @@ void registerStorageLiveView(StorageFactory & factory)
 {
     factory.registerStorage("LiveView", [](const StorageFactory::Arguments & args)
     {
-        if (!args.attach && !args.local_context.getSettingsRef().allow_experimental_live_view)
-            throw Exception("Experimental LIVE VIEW feature is not enabled (the setting 'allow_experimental_live_view')", ErrorCodes::SUPPORT_IS_DISABLED);
+        if (!args.attach && !args.getLocalContext()->getSettingsRef().allow_experimental_live_view)
+            throw Exception(
+                "Experimental LIVE VIEW feature is not enabled (the setting 'allow_experimental_live_view')",
+                ErrorCodes::SUPPORT_IS_DISABLED);
 
-        return StorageLiveView::create(args.table_id, args.local_context, args.query, args.columns);
+        return StorageLiveView::create(args.table_id, args.getLocalContext(), args.query, args.columns);
     });
 }
 
diff --git a/src/Storages/LiveView/StorageLiveView.h b/src/Storages/LiveView/StorageLiveView.h
index e30a8f51705..df09316f333 100644
--- a/src/Storages/LiveView/StorageLiveView.h
+++ b/src/Storages/LiveView/StorageLiveView.h
@@ -49,7 +49,7 @@ class Pipe;
 using Pipes = std::vector<Pipe>;
 
 
-class StorageLiveView final : public ext::shared_ptr_helper<StorageLiveView>, public IStorage
+class StorageLiveView final : public ext::shared_ptr_helper<StorageLiveView>, public IStorage, WithContext
 {
 friend struct ext::shared_ptr_helper<StorageLiveView>;
 friend class LiveViewBlockInputStream;
@@ -142,13 +142,13 @@ public:
     void startup() override;
     void shutdown() override;
 
-    void refresh(const bool grab_lock = true);
+    void refresh(bool grab_lock = true);
 
     Pipe read(
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -156,7 +156,7 @@ public:
     BlockInputStreams watch(
         const Names & column_names,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -165,7 +165,7 @@ public:
     MergeableBlocksPtr getMergeableBlocks() { return mergeable_blocks; }
 
     /// Collect mergeable blocks and their sample. Must be called holding mutex
-    MergeableBlocksPtr collectMergeableBlocks(const Context & context);
+    MergeableBlocksPtr collectMergeableBlocks(ContextPtr context);
     /// Complete query using input streams from mergeable blocks
     BlockInputStreamPtr completeQuery(Pipes pipes);
 
@@ -183,7 +183,7 @@ public:
     static void writeIntoLiveView(
         StorageLiveView & live_view,
         const Block & block,
-        const Context & context);
+        ContextPtr context);
 
 private:
     /// TODO move to common struct SelectQueryDescription
@@ -191,8 +191,7 @@ private:
     ASTPtr inner_query; /// stored query : SELECT * FROM ( SELECT a FROM A)
     ASTPtr inner_subquery; /// stored query's innermost subquery if any
     ASTPtr inner_blocks_query; /// query over the mergeable blocks to produce final result
-    Context & global_context;
-    std::unique_ptr<Context> live_view_context;
+    ContextPtr live_view_context;
 
     Poco::Logger * log;
 
@@ -231,7 +230,7 @@ private:
 
     StorageLiveView(
         const StorageID & table_id_,
-        Context & local_context,
+        ContextPtr context_,
         const ASTCreateQuery & query,
         const ColumnsDescription & columns
     );
diff --git a/src/Storages/LiveView/TemporaryLiveViewCleaner.cpp b/src/Storages/LiveView/TemporaryLiveViewCleaner.cpp
index 5896127feb5..7294b82f10d 100644
--- a/src/Storages/LiveView/TemporaryLiveViewCleaner.cpp
+++ b/src/Storages/LiveView/TemporaryLiveViewCleaner.cpp
@@ -1,8 +1,9 @@
 #include <Storages/LiveView/TemporaryLiveViewCleaner.h>
-#include <Storages/LiveView/StorageLiveView.h>
+
 #include <Interpreters/DatabaseCatalog.h>
 #include <Interpreters/InterpreterDropQuery.h>
 #include <Parsers/ASTDropQuery.h>
+#include <Storages/LiveView/StorageLiveView.h>
 
 
 namespace DB
@@ -15,7 +16,7 @@ namespace ErrorCodes
 
 namespace
 {
-    void executeDropQuery(const StorageID & storage_id, Context & context)
+    void executeDropQuery(const StorageID & storage_id, ContextPtr context)
     {
         if (!DatabaseCatalog::instance().isTableExist(storage_id, context))
             return;
@@ -41,7 +42,7 @@ namespace
 std::unique_ptr<TemporaryLiveViewCleaner> TemporaryLiveViewCleaner::the_instance;
 
 
-void TemporaryLiveViewCleaner::init(Context & global_context_)
+void TemporaryLiveViewCleaner::init(ContextPtr global_context_)
 {
     if (the_instance)
         throw Exception("TemporaryLiveViewCleaner already initialized", ErrorCodes::LOGICAL_ERROR);
@@ -62,8 +63,7 @@ void TemporaryLiveViewCleaner::shutdown()
     the_instance.reset();
 }
 
-TemporaryLiveViewCleaner::TemporaryLiveViewCleaner(Context & global_context_)
-    : global_context(global_context_)
+TemporaryLiveViewCleaner::TemporaryLiveViewCleaner(ContextPtr global_context_) : WithContext(global_context_)
 {
 }
 
@@ -142,7 +142,7 @@ void TemporaryLiveViewCleaner::backgroundThreadFunc()
 
         lock.unlock();
         for (const auto & storage_id : storages_to_drop)
-            executeDropQuery(storage_id, global_context);
+            executeDropQuery(storage_id, getContext());
         lock.lock();
     }
 }
diff --git a/src/Storages/LiveView/TemporaryLiveViewCleaner.h b/src/Storages/LiveView/TemporaryLiveViewCleaner.h
index 18d7562c7ab..9b31bf9c999 100644
--- a/src/Storages/LiveView/TemporaryLiveViewCleaner.h
+++ b/src/Storages/LiveView/TemporaryLiveViewCleaner.h
@@ -1,17 +1,20 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
 #include <Common/ThreadPool.h>
+
 #include <chrono>
 
 
 namespace DB
 {
+
 class StorageLiveView;
 struct StorageID;
 
 /// This class removes temporary live views in the background thread when it's possible.
 /// There should only a single instance of this class.
-class TemporaryLiveViewCleaner
+class TemporaryLiveViewCleaner : WithContext
 {
 public:
     static TemporaryLiveViewCleaner & instance() { return *the_instance; }
@@ -20,7 +23,7 @@ public:
     void addView(const std::shared_ptr<StorageLiveView> & view);
 
     /// Should be called once.
-    static void init(Context & global_context_);
+    static void init(ContextPtr global_context_);
     static void shutdown();
 
     void startup();
@@ -28,7 +31,7 @@ public:
 private:
     friend std::unique_ptr<TemporaryLiveViewCleaner>::deleter_type;
 
-    TemporaryLiveViewCleaner(Context & global_context_);
+    TemporaryLiveViewCleaner(ContextPtr global_context_);
     ~TemporaryLiveViewCleaner();
 
     void backgroundThreadFunc();
@@ -43,7 +46,6 @@ private:
     };
 
     static std::unique_ptr<TemporaryLiveViewCleaner> the_instance;
-    Context & global_context;
     std::mutex mutex;
     std::vector<StorageAndTimeOfCheck> views;
     ThreadFromGlobalPool background_thread;
diff --git a/src/Storages/MergeTree/BackgroundJobsExecutor.cpp b/src/Storages/MergeTree/BackgroundJobsExecutor.cpp
index 8e5a0e8a3b8..ae06721b43d 100644
--- a/src/Storages/MergeTree/BackgroundJobsExecutor.cpp
+++ b/src/Storages/MergeTree/BackgroundJobsExecutor.cpp
@@ -16,10 +16,10 @@ namespace DB
 {
 
 IBackgroundJobExecutor::IBackgroundJobExecutor(
-        Context & global_context_,
+        ContextPtr global_context_,
         const BackgroundTaskSchedulingSettings & sleep_settings_,
         const std::vector<PoolConfig> & pools_configs_)
-    : global_context(global_context_)
+    : WithContext(global_context_)
     , sleep_settings(sleep_settings_)
     , rng(randomSeed())
 {
@@ -155,7 +155,7 @@ void IBackgroundJobExecutor::start()
     std::lock_guard lock(scheduling_task_mutex);
     if (!scheduling_task)
     {
-        scheduling_task = global_context.getSchedulePool().createTask(
+        scheduling_task = getContext()->getSchedulePool().createTask(
             getBackgroundTaskName(), [this]{ jobExecutingTask(); });
     }
 
@@ -187,12 +187,12 @@ IBackgroundJobExecutor::~IBackgroundJobExecutor()
 
 BackgroundJobsExecutor::BackgroundJobsExecutor(
        MergeTreeData & data_,
-       Context & global_context_)
+       ContextPtr global_context_)
     : IBackgroundJobExecutor(
         global_context_,
-        global_context_.getBackgroundProcessingTaskSchedulingSettings(),
-        {PoolConfig{PoolType::MERGE_MUTATE, global_context_.getSettingsRef().background_pool_size, CurrentMetrics::BackgroundPoolTask},
-         PoolConfig{PoolType::FETCH, global_context_.getSettingsRef().background_fetches_pool_size, CurrentMetrics::BackgroundFetchesPoolTask}})
+        global_context_->getBackgroundProcessingTaskSchedulingSettings(),
+        {PoolConfig{PoolType::MERGE_MUTATE, global_context_->getSettingsRef().background_pool_size, CurrentMetrics::BackgroundPoolTask},
+         PoolConfig{PoolType::FETCH, global_context_->getSettingsRef().background_fetches_pool_size, CurrentMetrics::BackgroundFetchesPoolTask}})
     , data(data_)
 {
 }
@@ -209,11 +209,11 @@ std::optional<JobAndPool> BackgroundJobsExecutor::getBackgroundJob()
 
 BackgroundMovesExecutor::BackgroundMovesExecutor(
        MergeTreeData & data_,
-       Context & global_context_)
+       ContextPtr global_context_)
     : IBackgroundJobExecutor(
         global_context_,
-        global_context_.getBackgroundMoveTaskSchedulingSettings(),
-      {PoolConfig{PoolType::MOVE, global_context_.getSettingsRef().background_move_pool_size, CurrentMetrics::BackgroundMovePoolTask}})
+        global_context_->getBackgroundMoveTaskSchedulingSettings(),
+      {PoolConfig{PoolType::MOVE, global_context_->getSettingsRef().background_move_pool_size, CurrentMetrics::BackgroundMovePoolTask}})
     , data(data_)
 {
 }
diff --git a/src/Storages/MergeTree/BackgroundJobsExecutor.h b/src/Storages/MergeTree/BackgroundJobsExecutor.h
index da22c752e1b..e9cefc7a6b0 100644
--- a/src/Storages/MergeTree/BackgroundJobsExecutor.h
+++ b/src/Storages/MergeTree/BackgroundJobsExecutor.h
@@ -50,11 +50,9 @@ struct JobAndPool
 /// Consists of two important parts:
 /// 1) Task in background scheduling pool which receives new jobs from storages and put them into required pool.
 /// 2) One or more ThreadPool objects, which execute background jobs.
-class IBackgroundJobExecutor
+class IBackgroundJobExecutor : protected WithContext
 {
 protected:
-    Context & global_context;
-
     /// Configuration for single background ThreadPool
     struct PoolConfig
     {
@@ -106,7 +104,7 @@ public:
 
 protected:
     IBackgroundJobExecutor(
-        Context & global_context_,
+        ContextPtr global_context_,
         const BackgroundTaskSchedulingSettings & sleep_settings_,
         const std::vector<PoolConfig> & pools_configs_);
 
@@ -134,7 +132,7 @@ private:
 public:
     BackgroundJobsExecutor(
         MergeTreeData & data_,
-        Context & global_context_);
+        ContextPtr global_context_);
 
 protected:
     String getBackgroundTaskName() const override;
@@ -150,7 +148,7 @@ private:
 public:
     BackgroundMovesExecutor(
         MergeTreeData & data_,
-        Context & global_context_);
+        ContextPtr global_context_);
 
 protected:
     String getBackgroundTaskName() const override;
diff --git a/src/Storages/MergeTree/DataPartsExchange.cpp b/src/Storages/MergeTree/DataPartsExchange.cpp
index 862a3088f89..205d57f533e 100644
--- a/src/Storages/MergeTree/DataPartsExchange.cpp
+++ b/src/Storages/MergeTree/DataPartsExchange.cpp
@@ -481,7 +481,7 @@ MergeTreeData::MutableDataPartPtr Fetcher::fetchPart(
 
     auto storage_id = data.getStorageID();
     String new_part_path = part_type == "InMemory" ? "memory" : data.getFullPathOnDisk(reservation->getDisk()) + part_name + "/";
-    auto entry = data.global_context.getReplicatedFetchList().insert(
+    auto entry = data.getContext()->getReplicatedFetchList().insert(
         storage_id.getDatabaseName(), storage_id.getTableName(),
         part_info.partition_id, part_name, new_part_path,
         replica_path, uri, to_detached, sum_files_size);
diff --git a/src/Storages/MergeTree/IMergeTreeReader.cpp b/src/Storages/MergeTree/IMergeTreeReader.cpp
index 53ab4713267..52d3e7ca9ab 100644
--- a/src/Storages/MergeTree/IMergeTreeReader.cpp
+++ b/src/Storages/MergeTree/IMergeTreeReader.cpp
@@ -187,12 +187,12 @@ void IMergeTreeReader::evaluateMissingDefaults(Block additional_columns, Columns
         }
 
         auto dag = DB::evaluateMissingDefaults(
-                additional_columns, columns, metadata_snapshot->getColumns(), storage.global_context);
+                additional_columns, columns, metadata_snapshot->getColumns(), storage.getContext());
         if (dag)
         {
             auto actions = std::make_shared<
                 ExpressionActions>(std::move(dag),
-                ExpressionActionsSettings::fromSettings(storage.global_context.getSettingsRef()));
+                ExpressionActionsSettings::fromSettings(storage.getContext()->getSettingsRef()));
             actions->execute(additional_columns);
         }
 
@@ -270,7 +270,7 @@ void IMergeTreeReader::performRequiredConversions(Columns & res_columns)
             copy_block.insert({res_columns[pos], getColumnFromPart(*name_and_type).type, name_and_type->name});
         }
 
-        DB::performRequiredConversions(copy_block, columns, storage.global_context);
+        DB::performRequiredConversions(copy_block, columns, storage.getContext());
 
         /// Move columns from block.
         name_and_type = columns.begin();
diff --git a/src/Storages/MergeTree/KeyCondition.cpp b/src/Storages/MergeTree/KeyCondition.cpp
index 6833d2e2fd4..7f33bba14fd 100644
--- a/src/Storages/MergeTree/KeyCondition.cpp
+++ b/src/Storages/MergeTree/KeyCondition.cpp
@@ -370,7 +370,7 @@ inline bool Range::less(const Field & lhs, const Field & rhs) { return applyVisi
   * For index to work when something like "WHERE Date = toDate(now())" is written.
   */
 Block KeyCondition::getBlockWithConstants(
-    const ASTPtr & query, const TreeRewriterResultPtr & syntax_analyzer_result, const Context & context)
+    const ASTPtr & query, const TreeRewriterResultPtr & syntax_analyzer_result, ContextPtr context)
 {
     Block result
     {
@@ -387,7 +387,7 @@ Block KeyCondition::getBlockWithConstants(
 
 KeyCondition::KeyCondition(
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     const Names & key_column_names,
     const ExpressionActionsPtr & key_expr_,
     bool single_point_,
@@ -556,7 +556,7 @@ static FieldRef applyFunction(const FunctionBasePtr & func, const DataTypePtr &
     return {field.columns, field.row_idx, result_idx};
 }
 
-void KeyCondition::traverseAST(const ASTPtr & node, const Context & context, Block & block_with_constants)
+void KeyCondition::traverseAST(const ASTPtr & node, ContextPtr context, Block & block_with_constants)
 {
     RPNElement element;
 
@@ -786,7 +786,7 @@ bool KeyCondition::canConstantBeWrappedByFunctions(
 
 bool KeyCondition::tryPrepareSetIndex(
     const ASTs & args,
-    const Context & context,
+    ContextPtr context,
     RPNElement & out,
     size_t & out_key_column_num)
 {
@@ -947,7 +947,7 @@ private:
 
 bool KeyCondition::isKeyPossiblyWrappedByMonotonicFunctions(
     const ASTPtr & node,
-    const Context & context,
+    ContextPtr context,
     size_t & out_key_column_num,
     DataTypePtr & out_key_res_column_type,
     MonotonicFunctionsChain & out_functions_chain)
@@ -1075,7 +1075,7 @@ static void castValueToType(const DataTypePtr & desired_type, Field & src_value,
 }
 
 
-bool KeyCondition::tryParseAtomFromAST(const ASTPtr & node, const Context & context, Block & block_with_constants, RPNElement & out)
+bool KeyCondition::tryParseAtomFromAST(const ASTPtr & node, ContextPtr context, Block & block_with_constants, RPNElement & out)
 {
     /** Functions < > = != <= >= in `notIn`, where one argument is a constant, and the other is one of columns of key,
       *  or itself, wrapped in a chain of possibly-monotonic functions,
diff --git a/src/Storages/MergeTree/KeyCondition.h b/src/Storages/MergeTree/KeyCondition.h
index b8167f406bd..631fb0b7cc4 100644
--- a/src/Storages/MergeTree/KeyCondition.h
+++ b/src/Storages/MergeTree/KeyCondition.h
@@ -229,7 +229,7 @@ public:
     /// Does not take into account the SAMPLE section. all_columns - the set of all columns of the table.
     KeyCondition(
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         const Names & key_column_names,
         const ExpressionActionsPtr & key_expr,
         bool single_point_ = false,
@@ -307,7 +307,7 @@ public:
             const ASTPtr & expr, Block & block_with_constants, Field & out_value, DataTypePtr & out_type);
 
     static Block getBlockWithConstants(
-        const ASTPtr & query, const TreeRewriterResultPtr & syntax_analyzer_result, const Context & context);
+        const ASTPtr & query, const TreeRewriterResultPtr & syntax_analyzer_result, ContextPtr context);
 
     static std::optional<Range> applyMonotonicFunctionsChainToRange(
         Range key_range,
@@ -375,8 +375,8 @@ private:
         bool right_bounded,
         BoolMask initial_mask) const;
 
-    void traverseAST(const ASTPtr & node, const Context & context, Block & block_with_constants);
-    bool tryParseAtomFromAST(const ASTPtr & node, const Context & context, Block & block_with_constants, RPNElement & out);
+    void traverseAST(const ASTPtr & node, ContextPtr context, Block & block_with_constants);
+    bool tryParseAtomFromAST(const ASTPtr & node, ContextPtr context, Block & block_with_constants, RPNElement & out);
     static bool tryParseLogicalOperatorFromAST(const ASTFunction * func, RPNElement & out);
 
     /** Is node the key column
@@ -387,7 +387,7 @@ private:
       */
     bool isKeyPossiblyWrappedByMonotonicFunctions(
         const ASTPtr & node,
-        const Context & context,
+        ContextPtr context,
         size_t & out_key_column_num,
         DataTypePtr & out_key_res_column_type,
         MonotonicFunctionsChain & out_functions_chain);
@@ -413,7 +413,7 @@ private:
     /// do it and return true.
     bool tryPrepareSetIndex(
         const ASTs & args,
-        const Context & context,
+        ContextPtr context,
         RPNElement & out,
         size_t & out_key_column_num);
 
diff --git a/src/Storages/MergeTree/MergeTreeBlockOutputStream.cpp b/src/Storages/MergeTree/MergeTreeBlockOutputStream.cpp
index 6c9e14f9796..bc91e29d900 100644
--- a/src/Storages/MergeTree/MergeTreeBlockOutputStream.cpp
+++ b/src/Storages/MergeTree/MergeTreeBlockOutputStream.cpp
@@ -38,7 +38,7 @@ void MergeTreeBlockOutputStream::write(const Block & block)
         /// Part can be deduplicated, so increment counters and add to part log only if it's really added
         if (storage.renameTempPartAndAdd(part, &storage.increment, nullptr, storage.getDeduplicationLog()))
         {
-            PartLog::addNewPart(storage.global_context, part, watch.elapsed());
+            PartLog::addNewPart(storage.getContext(), part, watch.elapsed());
 
             /// Initiate async merge - it will be done if it's good time for merge and if there are space in 'background_pool'.
             storage.background_executor.triggerTask();
diff --git a/src/Storages/MergeTree/MergeTreeData.cpp b/src/Storages/MergeTree/MergeTreeData.cpp
index 81bbadc47f7..3f883572bec 100644
--- a/src/Storages/MergeTree/MergeTreeData.cpp
+++ b/src/Storages/MergeTree/MergeTreeData.cpp
@@ -133,7 +133,7 @@ MergeTreeData::MergeTreeData(
     const StorageID & table_id_,
     const String & relative_data_path_,
     const StorageInMemoryMetadata & metadata_,
-    Context & context_,
+    ContextPtr context_,
     const String & date_column_name,
     const MergingParams & merging_params_,
     std::unique_ptr<MergeTreeSettings> storage_settings_,
@@ -141,7 +141,7 @@ MergeTreeData::MergeTreeData(
     bool attach,
     BrokenPartCallback broken_part_callback_)
     : IStorage(table_id_)
-    , global_context(context_.getGlobalContext())
+    , WithContext(context_->getGlobalContext())
     , merging_params(merging_params_)
     , require_part_metadata(require_part_metadata_)
     , relative_data_path(relative_data_path_)
@@ -161,7 +161,7 @@ MergeTreeData::MergeTreeData(
 
     /// Check sanity of MergeTreeSettings. Only when table is created.
     if (!attach)
-        settings->sanityCheck(global_context.getSettingsRef());
+        settings->sanityCheck(getContext()->getSettingsRef());
 
     MergeTreeDataFormatVersion min_format_version(0);
     if (!date_column_name.empty())
@@ -231,7 +231,7 @@ MergeTreeData::MergeTreeData(
         format_version = min_format_version;
         auto buf = version_file.second->writeFile(version_file.first);
         writeIntText(format_version.toUnderType(), *buf);
-        if (global_context.getSettingsRef().fsync_metadata)
+        if (getContext()->getSettingsRef().fsync_metadata)
             buf->sync();
     }
     else
@@ -260,7 +260,7 @@ MergeTreeData::MergeTreeData(
 
 StoragePolicyPtr MergeTreeData::getStoragePolicy() const
 {
-    return global_context.getStoragePolicy(getSettings()->storage_policy);
+    return getContext()->getStoragePolicy(getSettings()->storage_policy);
 }
 
 static void checkKeyExpression(const ExpressionActions & expr, const Block & sample_block, const String & key_name, bool allow_nullable_key)
@@ -355,7 +355,7 @@ void MergeTreeData::checkProperties(
 
         if (!added_key_column_expr_list->children.empty())
         {
-            auto syntax = TreeRewriter(global_context).analyze(added_key_column_expr_list, all_columns);
+            auto syntax = TreeRewriter(getContext()).analyze(added_key_column_expr_list, all_columns);
             Names used_columns = syntax->requiredSourceColumns();
 
             NamesAndTypesList deleted_columns;
@@ -412,7 +412,7 @@ ExpressionActionsPtr getCombinedIndicesExpression(
     const KeyDescription & key,
     const IndicesDescription & indices,
     const ColumnsDescription & columns,
-    const Context & context)
+    ContextPtr context)
 {
     ASTPtr combined_expr_list = key.expression_list_ast->clone();
 
@@ -451,12 +451,12 @@ DataTypes MergeTreeData::getMinMaxColumnsTypes(const KeyDescription & partition_
 
 ExpressionActionsPtr MergeTreeData::getPrimaryKeyAndSkipIndicesExpression(const StorageMetadataPtr & metadata_snapshot) const
 {
-    return getCombinedIndicesExpression(metadata_snapshot->getPrimaryKey(), metadata_snapshot->getSecondaryIndices(), metadata_snapshot->getColumns(), global_context);
+    return getCombinedIndicesExpression(metadata_snapshot->getPrimaryKey(), metadata_snapshot->getSecondaryIndices(), metadata_snapshot->getColumns(), getContext());
 }
 
 ExpressionActionsPtr MergeTreeData::getSortingKeyAndSkipIndicesExpression(const StorageMetadataPtr & metadata_snapshot) const
 {
-    return getCombinedIndicesExpression(metadata_snapshot->getSortingKey(), metadata_snapshot->getSecondaryIndices(), metadata_snapshot->getColumns(), global_context);
+    return getCombinedIndicesExpression(metadata_snapshot->getSortingKey(), metadata_snapshot->getSecondaryIndices(), metadata_snapshot->getColumns(), getContext());
 }
 
 
@@ -684,16 +684,16 @@ void MergeTreeData::MergingParams::check(const StorageInMemoryMetadata & metadat
 
 
 std::optional<UInt64> MergeTreeData::totalRowsByPartitionPredicateImpl(
-    const SelectQueryInfo & query_info, const Context & context, const DataPartsVector & parts) const
+    const SelectQueryInfo & query_info, ContextPtr local_context, const DataPartsVector & parts) const
 {
     auto metadata_snapshot = getInMemoryMetadataPtr();
     ASTPtr expression_ast;
     Block virtual_columns_block = MergeTreeDataSelectExecutor::getSampleBlockWithVirtualPartColumns();
 
     // Generate valid expressions for filtering
-    bool valid = VirtualColumnUtils::prepareFilterBlockWithQuery(query_info.query, context, virtual_columns_block, expression_ast);
+    bool valid = VirtualColumnUtils::prepareFilterBlockWithQuery(query_info.query, local_context, virtual_columns_block, expression_ast);
 
-    PartitionPruner partition_pruner(metadata_snapshot->getPartitionKey(), query_info, context, true /* strict */);
+    PartitionPruner partition_pruner(metadata_snapshot->getPartitionKey(), query_info, local_context, true /* strict */);
     if (partition_pruner.isUseless() && !valid)
         return {};
 
@@ -701,7 +701,7 @@ std::optional<UInt64> MergeTreeData::totalRowsByPartitionPredicateImpl(
     if (valid && expression_ast)
     {
         MergeTreeDataSelectExecutor::fillBlockWithVirtualPartColumns(parts, virtual_columns_block);
-        VirtualColumnUtils::filterBlockWithQuery(query_info.query, virtual_columns_block, context, expression_ast);
+        VirtualColumnUtils::filterBlockWithQuery(query_info.query, virtual_columns_block, local_context, expression_ast);
         part_values = VirtualColumnUtils::extractSingleValueFromBlock<String>(virtual_columns_block, "_part");
         if (part_values.empty())
             return 0;
@@ -766,7 +766,7 @@ void MergeTreeData::loadDataParts(bool skip_sanity_checks)
         for (const auto & disk_ptr : disks)
             defined_disk_names.insert(disk_ptr->getName());
 
-        for (const auto & [disk_name, disk] : global_context.getDisksMap())
+        for (const auto & [disk_name, disk] : getContext()->getDisksMap())
         {
             if (defined_disk_names.count(disk_name) == 0 && disk->exists(relative_data_path))
             {
@@ -1169,7 +1169,7 @@ void MergeTreeData::removePartsFinally(const MergeTreeData::DataPartsVector & pa
     /// NOTE: There is no need to log parts deletion somewhere else, all deleting parts pass through this function and pass away
 
     auto table_id = getStorageID();
-    if (auto part_log = global_context.getPartLog(table_id.database_name))
+    if (auto part_log = getContext()->getPartLog(table_id.database_name))
     {
         PartLogElement part_log_elem;
 
@@ -1201,7 +1201,7 @@ void MergeTreeData::clearOldPartsFromFilesystem(bool force)
     /// This is needed to close files to avoid they reside on disk after being deleted.
     /// NOTE: we can drop files from cache more selectively but this is good enough.
     if (!parts_to_remove.empty())
-        global_context.dropMMappedFileCache();
+        getContext()->dropMMappedFileCache();
 }
 
 void MergeTreeData::clearPartsFromFilesystem(const DataPartsVector & parts_to_remove)
@@ -1303,7 +1303,7 @@ void MergeTreeData::clearEmptyParts()
         {
             ASTPtr literal = std::make_shared<ASTLiteral>(part->name);
             /// If another replica has already started drop, it's ok, no need to throw.
-            dropPartition(literal, /* detach = */ false, /*drop_part = */ true, global_context, /* throw_if_noop = */ false);
+            dropPartition(literal, /* detach = */ false, /*drop_part = */ true, getContext(), /* throw_if_noop = */ false);
         }
     }
 }
@@ -1326,7 +1326,7 @@ void MergeTreeData::rename(const String & new_table_path, const StorageID & new_
     }
 
     if (!getStorageID().hasUUID())
-        global_context.dropCaches();
+        getContext()->dropCaches();
 
     relative_data_path = new_table_path;
     renameInMemory(new_table_id);
@@ -1348,7 +1348,7 @@ void MergeTreeData::dropAllData()
     /// Tables in atomic databases have UUID and stored in persistent locations.
     /// No need to drop caches (that are keyed by filesystem path) because collision is not possible.
     if (!getStorageID().hasUUID())
-        global_context.dropCaches();
+        getContext()->dropCaches();
 
     LOG_TRACE(log, "dropAllData: removing data from filesystem.");
 
@@ -1473,23 +1473,23 @@ void checkVersionColumnTypesConversion(const IDataType * old_type, const IDataTy
 
 }
 
-void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, ContextPtr local_context) const
 {
     /// Check that needed transformations can be applied to the list of columns without considering type conversions.
     StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
     StorageInMemoryMetadata old_metadata = getInMemoryMetadata();
 
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
 
     if (!settings.allow_non_metadata_alters)
     {
 
-        auto mutation_commands = commands.getMutationCommands(new_metadata, settings.materialize_ttl_after_modify, global_context);
+        auto mutation_commands = commands.getMutationCommands(new_metadata, settings.materialize_ttl_after_modify, getContext());
 
         if (!mutation_commands.empty())
             throw Exception(ErrorCodes::ALTER_OF_COLUMN_IS_FORBIDDEN, "The following alter commands: '{}' will modify data on disk, but setting `allow_non_metadata_alters` is disabled", queryToString(mutation_commands.ast()));
     }
-    commands.apply(new_metadata, global_context);
+    commands.apply(new_metadata, getContext());
 
     /// Set of columns that shouldn't be altered.
     NameSet columns_alter_type_forbidden;
@@ -1552,13 +1552,13 @@ void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, const C
         old_types.emplace(column.name, column.type.get());
 
     NamesAndTypesList columns_to_check_conversion;
-    auto name_deps = getDependentViewsByColumn(context);
+    auto name_deps = getDependentViewsByColumn(local_context);
     for (const AlterCommand & command : commands)
     {
         /// Just validate partition expression
         if (command.partition)
         {
-            getPartitionIDFromQuery(command.partition, global_context);
+            getPartitionIDFromQuery(command.partition, getContext());
         }
 
         if (command.column_name == merging_params.version_column)
@@ -1692,7 +1692,7 @@ void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, const C
     if (!columns_to_check_conversion.empty())
     {
         auto old_header = old_metadata.getSampleBlock();
-        performRequiredConversions(old_header, columns_to_check_conversion, global_context);
+        performRequiredConversions(old_header, columns_to_check_conversion, getContext());
     }
 
     if (old_metadata.hasSettingsChanges())
@@ -1723,7 +1723,7 @@ void MergeTreeData::checkAlterIsPossible(const AlterCommands & commands, const C
             }
 
             if (setting_name == "storage_policy")
-                checkStoragePolicy(global_context.getStoragePolicy(new_value.safeGet<String>()));
+                checkStoragePolicy(getContext()->getStoragePolicy(new_value.safeGet<String>()));
         }
     }
 
@@ -1848,7 +1848,7 @@ void MergeTreeData::changeSettings(
         {
             if (change.name == "storage_policy")
             {
-                StoragePolicyPtr new_storage_policy = global_context.getStoragePolicy(change.value.safeGet<String>());
+                StoragePolicyPtr new_storage_policy = getContext()->getStoragePolicy(change.value.safeGet<String>());
                 StoragePolicyPtr old_storage_policy = getStoragePolicy();
 
                 /// StoragePolicy of different version or name is guaranteed to have different pointer
@@ -1885,7 +1885,7 @@ void MergeTreeData::changeSettings(
         MergeTreeSettings copy = *getSettings();
         copy.applyChanges(new_changes);
 
-        copy.sanityCheck(global_context.getSettingsRef());
+        copy.sanityCheck(getContext()->getSettingsRef());
 
         storage_settings.set(std::make_unique<const MergeTreeSettings>(copy));
         StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
@@ -2749,7 +2749,8 @@ void MergeTreeData::removePartContributionToColumnSizes(const DataPartPtr & part
     }
 }
 
-void MergeTreeData::checkAlterPartitionIsPossible(const PartitionCommands & commands, const StorageMetadataPtr & /*metadata_snapshot*/, const Settings & settings) const
+void MergeTreeData::checkAlterPartitionIsPossible(
+    const PartitionCommands & commands, const StorageMetadataPtr & /*metadata_snapshot*/, const Settings & settings) const
 {
     for (const auto & command : commands)
     {
@@ -2769,7 +2770,7 @@ void MergeTreeData::checkAlterPartitionIsPossible(const PartitionCommands & comm
             else
             {
                 /// We are able to parse it
-                getPartitionIDFromQuery(command.partition, global_context);
+                getPartitionIDFromQuery(command.partition, getContext());
             }
         }
     }
@@ -2777,7 +2778,7 @@ void MergeTreeData::checkAlterPartitionIsPossible(const PartitionCommands & comm
 
 void MergeTreeData::checkPartitionCanBeDropped(const ASTPtr & partition)
 {
-    const String partition_id = getPartitionIDFromQuery(partition, global_context);
+    const String partition_id = getPartitionIDFromQuery(partition, getContext());
     auto parts_to_remove = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
 
     UInt64 partition_size = 0;
@@ -2786,7 +2787,7 @@ void MergeTreeData::checkPartitionCanBeDropped(const ASTPtr & partition)
         partition_size += part->getBytesOnDisk();
 
     auto table_id = getStorageID();
-    global_context.checkPartitionCanBeDropped(table_id.database_name, table_id.table_name, partition_size);
+    getContext()->checkPartitionCanBeDropped(table_id.database_name, table_id.table_name, partition_size);
 }
 
 void MergeTreeData::checkPartCanBeDropped(const ASTPtr & part_ast)
@@ -2797,17 +2798,17 @@ void MergeTreeData::checkPartCanBeDropped(const ASTPtr & part_ast)
         throw Exception(ErrorCodes::NO_SUCH_DATA_PART, "No part {} in committed state", part_name);
 
     auto table_id = getStorageID();
-    global_context.checkPartitionCanBeDropped(table_id.database_name, table_id.table_name, part->getBytesOnDisk());
+    getContext()->checkPartitionCanBeDropped(table_id.database_name, table_id.table_name, part->getBytesOnDisk());
 }
 
-void MergeTreeData::movePartitionToDisk(const ASTPtr & partition, const String & name, bool moving_part, const Context & context)
+void MergeTreeData::movePartitionToDisk(const ASTPtr & partition, const String & name, bool moving_part, ContextPtr local_context)
 {
     String partition_id;
 
     if (moving_part)
         partition_id = partition->as<ASTLiteral &>().value.safeGet<String>();
     else
-        partition_id = getPartitionIDFromQuery(partition, context);
+        partition_id = getPartitionIDFromQuery(partition, local_context);
 
     DataPartsVector parts;
     if (moving_part)
@@ -2845,14 +2846,14 @@ void MergeTreeData::movePartitionToDisk(const ASTPtr & partition, const String &
 }
 
 
-void MergeTreeData::movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, const Context & context)
+void MergeTreeData::movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, ContextPtr local_context)
 {
     String partition_id;
 
     if (moving_part)
         partition_id = partition->as<ASTLiteral &>().value.safeGet<String>();
     else
-        partition_id = getPartitionIDFromQuery(partition, context);
+        partition_id = getPartitionIDFromQuery(partition, local_context);
 
     DataPartsVector parts;
     if (moving_part)
@@ -2899,7 +2900,7 @@ void MergeTreeData::movePartitionToVolume(const ASTPtr & partition, const String
         throw Exception("Cannot move parts because moves are manually disabled", ErrorCodes::ABORTED);
 }
 
-void MergeTreeData::fetchPartition(const ASTPtr & /*partition*/, const StorageMetadataPtr & /*metadata_snapshot*/, const String & /*from*/, const Context & /*query_context*/)
+void MergeTreeData::fetchPartition(const ASTPtr & /*partition*/, const StorageMetadataPtr & /*metadata_snapshot*/, const String & /*from*/, ContextPtr /*query_context*/)
 {
     throw Exception(ErrorCodes::NOT_IMPLEMENTED, "FETCH PARTITION is not supported by storage {}", getName());
 }
@@ -2907,7 +2908,7 @@ void MergeTreeData::fetchPartition(const ASTPtr & /*partition*/, const StorageMe
 Pipe MergeTreeData::alterPartition(
     const StorageMetadataPtr & metadata_snapshot,
     const PartitionCommands & commands,
-    const Context & query_context)
+    ContextPtr query_context)
 {
     PartitionCommandsResultInfo result;
     for (const PartitionCommand & command : commands)
@@ -2944,7 +2945,7 @@ Pipe MergeTreeData::alterPartition(
 
                     case PartitionCommand::MoveDestinationType::TABLE:
                         checkPartitionCanBeDropped(command.partition);
-                        String dest_database = query_context.resolveDatabase(command.to_database);
+                        String dest_database = query_context->resolveDatabase(command.to_database);
                         auto dest_storage = DatabaseCatalog::instance().getTable({dest_database, command.to_table}, query_context);
                         movePartitionToTable(dest_storage, command.partition, query_context);
                         break;
@@ -2955,7 +2956,7 @@ Pipe MergeTreeData::alterPartition(
             case PartitionCommand::REPLACE_PARTITION:
             {
                 checkPartitionCanBeDropped(command.partition);
-                String from_database = query_context.resolveDatabase(command.from_database);
+                String from_database = query_context->resolveDatabase(command.from_database);
                 auto from_storage = DatabaseCatalog::instance().getTable({from_database, command.from_table}, query_context);
                 replacePartitionFrom(from_storage, command.partition, command.replace, query_context);
             }
@@ -2967,28 +2968,28 @@ Pipe MergeTreeData::alterPartition(
 
             case PartitionCommand::FREEZE_PARTITION:
             {
-                auto lock = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+                auto lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
                 current_command_results = freezePartition(command.partition, metadata_snapshot, command.with_name, query_context, lock);
             }
             break;
 
             case PartitionCommand::FREEZE_ALL_PARTITIONS:
             {
-                auto lock = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+                auto lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
                 current_command_results = freezeAll(command.with_name, metadata_snapshot, query_context, lock);
             }
             break;
 
             case PartitionCommand::UNFREEZE_PARTITION:
             {
-                auto lock = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+                auto lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
                 current_command_results = unfreezePartition(command.partition, command.with_name, query_context, lock);
             }
             break;
 
             case PartitionCommand::UNFREEZE_ALL_PARTITIONS:
             {
-                auto lock = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+                auto lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
                 current_command_results = unfreezeAll(command.with_name, query_context, lock);
             }
 
@@ -2999,13 +3000,13 @@ Pipe MergeTreeData::alterPartition(
         result.insert(result.end(), current_command_results.begin(), current_command_results.end());
     }
 
-    if (query_context.getSettingsRef().alter_partition_verbose_result)
+    if (query_context->getSettingsRef().alter_partition_verbose_result)
         return convertCommandsResultToSource(result);
 
     return {};
 }
 
-String MergeTreeData::getPartitionIDFromQuery(const ASTPtr & ast, const Context & context) const
+String MergeTreeData::getPartitionIDFromQuery(const ASTPtr & ast, ContextPtr local_context) const
 {
     const auto & partition_ast = ast->as<ASTPartition &>();
 
@@ -3047,7 +3048,12 @@ String MergeTreeData::getPartitionIDFromQuery(const ASTPtr & ast, const Context
         ReadBufferFromMemory right_paren_buf(")", 1);
         ConcatReadBuffer buf({&left_paren_buf, &fields_buf, &right_paren_buf});
 
-        auto input_format = FormatFactory::instance().getInput("Values", buf, metadata_snapshot->getPartitionKey().sample_block, context, context.getSettingsRef().max_block_size);
+        auto input_format = FormatFactory::instance().getInput(
+            "Values",
+            buf,
+            metadata_snapshot->getPartitionKey().sample_block,
+            local_context,
+            local_context->getSettingsRef().max_block_size);
         auto input_stream = std::make_shared<InputStreamFromInputFormat>(input_format);
 
         auto block = input_stream->read();
@@ -3160,7 +3166,7 @@ void MergeTreeData::validateDetachedPartName(const String & name) const
                             ErrorCodes::BAD_DATA_PART_NAME);
 }
 
-void MergeTreeData::dropDetached(const ASTPtr & partition, bool part, const Context & context)
+void MergeTreeData::dropDetached(const ASTPtr & partition, bool part, ContextPtr local_context)
 {
     PartsTemporaryRename renamed_parts(*this, "detached/");
 
@@ -3172,7 +3178,7 @@ void MergeTreeData::dropDetached(const ASTPtr & partition, bool part, const Cont
     }
     else
     {
-        String partition_id = getPartitionIDFromQuery(partition, context);
+        String partition_id = getPartitionIDFromQuery(partition, local_context);
         DetachedPartsInfo detached_parts = getDetachedParts();
         for (const auto & part_info : detached_parts)
             if (part_info.valid_name && part_info.partition_id == partition_id
@@ -3194,7 +3200,7 @@ void MergeTreeData::dropDetached(const ASTPtr & partition, bool part, const Cont
 }
 
 MergeTreeData::MutableDataPartsVector MergeTreeData::tryLoadPartsToAttach(const ASTPtr & partition, bool attach_part,
-        const Context & context, PartsTemporaryRename & renamed_parts)
+        ContextPtr local_context, PartsTemporaryRename & renamed_parts)
 {
     const String source_dir = "detached/";
 
@@ -3213,7 +3219,7 @@ MergeTreeData::MutableDataPartsVector MergeTreeData::tryLoadPartsToAttach(const
     }
     else
     {
-        String partition_id = getPartitionIDFromQuery(partition, context);
+        String partition_id = getPartitionIDFromQuery(partition, local_context);
         LOG_DEBUG(log, "Looking for parts for partition {} in {}", partition_id, source_dir);
         ActiveDataPartSet active_parts(format_version);
 
@@ -3439,7 +3445,7 @@ CompressionCodecPtr MergeTreeData::getCompressionCodecForPart(size_t part_size_c
     if (best_ttl_entry)
         return CompressionCodecFactory::instance().get(best_ttl_entry->recompression_codec, {});
 
-    return global_context.chooseCompressionCodec(
+    return getContext()->chooseCompressionCodec(
         part_size_compressed,
         static_cast<double>(part_size_compressed) / getTotalActiveSizeInBytes());
 }
@@ -3600,7 +3606,7 @@ bool MergeTreeData::isPrimaryOrMinMaxKeyColumnPossiblyWrappedInFunctions(
 }
 
 bool MergeTreeData::mayBenefitFromIndexForIn(
-    const ASTPtr & left_in_operand, const Context &, const StorageMetadataPtr & metadata_snapshot) const
+    const ASTPtr & left_in_operand, ContextPtr, const StorageMetadataPtr & metadata_snapshot) const
 {
     /// Make sure that the left side of the IN operator contain part of the key.
     /// If there is a tuple on the left side of the IN operator, at least one item of the tuple
@@ -3764,7 +3770,7 @@ MergeTreeData::PathsWithDisks MergeTreeData::getRelativeDataPathsWithDisks() con
     return res;
 }
 
-MergeTreeData::MatcherFn MergeTreeData::getPartitionMatcher(const ASTPtr & partition_ast, const Context & context) const
+MergeTreeData::MatcherFn MergeTreeData::getPartitionMatcher(const ASTPtr & partition_ast, ContextPtr local_context) const
 {
     bool prefixed = false;
     String id;
@@ -3780,10 +3786,10 @@ MergeTreeData::MatcherFn MergeTreeData::getPartitionMatcher(const ASTPtr & parti
             prefixed = true;
         }
         else
-            id = getPartitionIDFromQuery(partition_ast, context);
+            id = getPartitionIDFromQuery(partition_ast, local_context);
     }
     else
-        id = getPartitionIDFromQuery(partition_ast, context);
+        id = getPartitionIDFromQuery(partition_ast, local_context);
 
     return [prefixed, id](const String & partition_id)
     {
@@ -3798,28 +3804,28 @@ PartitionCommandsResultInfo MergeTreeData::freezePartition(
     const ASTPtr & partition_ast,
     const StorageMetadataPtr & metadata_snapshot,
     const String & with_name,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder &)
 {
-    return freezePartitionsByMatcher(getPartitionMatcher(partition_ast, context), metadata_snapshot, with_name, context);
+    return freezePartitionsByMatcher(getPartitionMatcher(partition_ast, local_context), metadata_snapshot, with_name, local_context);
 }
 
 PartitionCommandsResultInfo MergeTreeData::freezeAll(
     const String & with_name,
     const StorageMetadataPtr & metadata_snapshot,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder &)
 {
-    return freezePartitionsByMatcher([] (const String &) { return true; }, metadata_snapshot, with_name, context);
+    return freezePartitionsByMatcher([] (const String &) { return true; }, metadata_snapshot, with_name, local_context);
 }
 
 PartitionCommandsResultInfo MergeTreeData::freezePartitionsByMatcher(
     MatcherFn matcher,
     const StorageMetadataPtr & metadata_snapshot,
     const String & with_name,
-    const Context & context)
+    ContextPtr local_context)
 {
-    String clickhouse_path = Poco::Path(context.getPath()).makeAbsolute().toString();
+    String clickhouse_path = Poco::Path(local_context->getPath()).makeAbsolute().toString();
     String default_shadow_path = clickhouse_path + "shadow/";
     Poco::File(default_shadow_path).createDirectories();
     auto increment = Increment(default_shadow_path + "increment.txt").get(true);
@@ -3873,21 +3879,21 @@ PartitionCommandsResultInfo MergeTreeData::freezePartitionsByMatcher(
 PartitionCommandsResultInfo MergeTreeData::unfreezePartition(
     const ASTPtr & partition,
     const String & backup_name,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder &)
 {
-    return unfreezePartitionsByMatcher(getPartitionMatcher(partition, context), backup_name, context);
+    return unfreezePartitionsByMatcher(getPartitionMatcher(partition, local_context), backup_name, local_context);
 }
 
 PartitionCommandsResultInfo MergeTreeData::unfreezeAll(
     const String & backup_name,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder &)
 {
-    return unfreezePartitionsByMatcher([] (const String &) { return true; }, backup_name, context);
+    return unfreezePartitionsByMatcher([] (const String &) { return true; }, backup_name, local_context);
 }
 
-PartitionCommandsResultInfo MergeTreeData::unfreezePartitionsByMatcher(MatcherFn matcher, const String & backup_name, const Context &)
+PartitionCommandsResultInfo MergeTreeData::unfreezePartitionsByMatcher(MatcherFn matcher, const String & backup_name, ContextPtr)
 {
     auto backup_path = std::filesystem::path("shadow") / escapeForFileName(backup_name) / relative_data_path;
 
@@ -3970,7 +3976,7 @@ void MergeTreeData::writePartLog(
 try
 {
     auto table_id = getStorageID();
-    auto part_log = global_context.getPartLog(table_id.database_name);
+    auto part_log = getContext()->getPartLog(table_id.database_name);
     if (!part_log)
         return;
 
@@ -4237,7 +4243,7 @@ NamesAndTypesList MergeTreeData::getVirtuals() const
 
 size_t MergeTreeData::getTotalMergesWithTTLInMergeList() const
 {
-    return global_context.getMergeList().getMergesWithTTLCount();
+    return getContext()->getMergeList().getMergesWithTTLCount();
 }
 
 void MergeTreeData::addPartContributionToDataVolume(const DataPartPtr & part)
diff --git a/src/Storages/MergeTree/MergeTreeData.h b/src/Storages/MergeTree/MergeTreeData.h
index 1bf66f9bfde..6c0bda07bb1 100644
--- a/src/Storages/MergeTree/MergeTreeData.h
+++ b/src/Storages/MergeTree/MergeTreeData.h
@@ -111,7 +111,7 @@ namespace ErrorCodes
 /// - MergeTreeDataWriter
 /// - MergeTreeDataMergerMutator
 
-class MergeTreeData : public IStorage
+class MergeTreeData : public IStorage, public WithContext
 {
 public:
     /// Function to call if the part is suspected to contain corrupt data.
@@ -349,7 +349,7 @@ public:
     MergeTreeData(const StorageID & table_id_,
                   const String & relative_data_path_,
                   const StorageInMemoryMetadata & metadata_,
-                  Context & context_,
+                  ContextPtr context_,
                   const String & date_column_name,
                   const MergingParams & merging_params_,
                   std::unique_ptr<MergeTreeSettings> settings_,
@@ -375,7 +375,7 @@ public:
 
     NamesAndTypesList getVirtuals() const override;
 
-    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context &, const StorageMetadataPtr & metadata_snapshot) const override;
+    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr, const StorageMetadataPtr & metadata_snapshot) const override;
 
     /// Load the set of data parts from disk. Call once - immediately after the object is created.
     void loadDataParts(bool skip_sanity_checks);
@@ -398,10 +398,10 @@ public:
 
     void validateDetachedPartName(const String & name) const;
 
-    void dropDetached(const ASTPtr & partition, bool part, const Context & context);
+    void dropDetached(const ASTPtr & partition, bool part, ContextPtr context);
 
     MutableDataPartsVector tryLoadPartsToAttach(const ASTPtr & partition, bool attach_part,
-            const Context & context, PartsTemporaryRename & renamed_parts);
+            ContextPtr context, PartsTemporaryRename & renamed_parts);
 
     /// Returns Committed parts
     DataParts getDataParts() const;
@@ -531,7 +531,7 @@ public:
     /// - all type conversions can be done.
     /// - columns corresponding to primary key, indices, sign, sampling expression and date are not affected.
     /// If something is wrong, throws an exception.
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
     /// Checks if the Mutation can be performed.
     /// (currently no additional checks: always ok)
@@ -566,35 +566,34 @@ public:
         const ASTPtr & partition,
         const StorageMetadataPtr & metadata_snapshot,
         const String & with_name,
-        const Context & context,
+        ContextPtr context,
         TableLockHolder & table_lock_holder);
 
     /// Freezes all parts.
     PartitionCommandsResultInfo freezeAll(
         const String & with_name,
         const StorageMetadataPtr & metadata_snapshot,
-        const Context & context,
+        ContextPtr context,
         TableLockHolder & table_lock_holder);
 
     /// Unfreezes particular partition.
     PartitionCommandsResultInfo unfreezePartition(
         const ASTPtr & partition,
         const String & backup_name,
-        const Context & context,
+        ContextPtr context,
         TableLockHolder & table_lock_holder);
 
     /// Unfreezes all parts.
     PartitionCommandsResultInfo unfreezeAll(
         const String & backup_name,
-        const Context & context,
+        ContextPtr context,
         TableLockHolder & table_lock_holder);
 
-public:
     /// Moves partition to specified Disk
-    void movePartitionToDisk(const ASTPtr & partition, const String & name, bool moving_part, const Context & context);
+    void movePartitionToDisk(const ASTPtr & partition, const String & name, bool moving_part, ContextPtr context);
 
     /// Moves partition to specified Volume
-    void movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, const Context & context);
+    void movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, ContextPtr context);
 
     void checkPartitionCanBeDropped(const ASTPtr & partition) override;
 
@@ -603,7 +602,7 @@ public:
     Pipe alterPartition(
         const StorageMetadataPtr & metadata_snapshot,
         const PartitionCommands & commands,
-        const Context & query_context) override;
+        ContextPtr query_context) override;
 
     size_t getColumnCompressedSize(const std::string & name) const
     {
@@ -619,7 +618,7 @@ public:
     }
 
     /// For ATTACH/DETACH/DROP PARTITION.
-    String getPartitionIDFromQuery(const ASTPtr & ast, const Context & context) const;
+    String getPartitionIDFromQuery(const ASTPtr & ast, ContextPtr context) const;
 
     /// Extracts MergeTreeData of other *MergeTree* storage
     ///  and checks that their structure suitable for ALTER TABLE ATTACH PARTITION FROM
@@ -710,12 +709,12 @@ public:
 
     /// Choose disk with max available free space
     /// Reserves 0 bytes
-    ReservationPtr makeEmptyReservationOnLargestDisk() { return getStoragePolicy()->makeEmptyReservationOnLargestDisk(); }
+    ReservationPtr makeEmptyReservationOnLargestDisk() const { return getStoragePolicy()->makeEmptyReservationOnLargestDisk(); }
 
     Disks getDisksByType(DiskType::Type type) const { return getStoragePolicy()->getDisksByType(type); }
 
     /// Return alter conversions for part which must be applied on fly.
-    AlterConversions getAlterConversionsForPart(const MergeTreeDataPartPtr part) const;
+    AlterConversions getAlterConversionsForPart(MergeTreeDataPartPtr part) const;
     /// Returns destination disk or volume for the TTL rule according to current storage policy
     /// 'is_insert' - is TTL move performed on new data part insert.
     SpacePtr getDestinationForMoveTTL(const TTLDescription & move_ttl, bool is_insert = false) const;
@@ -734,8 +733,6 @@ public:
 
     MergeTreeDataFormatVersion format_version;
 
-    Context & global_context;
-
     /// Merging params - what additional actions to perform during merge.
     const MergingParams merging_params;
 
@@ -895,7 +892,7 @@ protected:
     }
 
     std::optional<UInt64> totalRowsByPartitionPredicateImpl(
-        const SelectQueryInfo & query_info, const Context & context, const DataPartsVector & parts) const;
+        const SelectQueryInfo & query_info, ContextPtr context, const DataPartsVector & parts) const;
 
     static decltype(auto) getStateModifier(DataPartState state)
     {
@@ -961,19 +958,19 @@ protected:
 
     /// Common part for |freezePartition()| and |freezeAll()|.
     using MatcherFn = std::function<bool(const String &)>;
-    PartitionCommandsResultInfo freezePartitionsByMatcher(MatcherFn matcher, const StorageMetadataPtr & metadata_snapshot, const String & with_name, const Context & context);
-    PartitionCommandsResultInfo unfreezePartitionsByMatcher(MatcherFn matcher, const String & backup_name, const Context & context);
+    PartitionCommandsResultInfo freezePartitionsByMatcher(MatcherFn matcher, const StorageMetadataPtr & metadata_snapshot, const String & with_name, ContextPtr context);
+    PartitionCommandsResultInfo unfreezePartitionsByMatcher(MatcherFn matcher, const String & backup_name, ContextPtr context);
 
     // Partition helpers
     bool canReplacePartition(const DataPartPtr & src_part) const;
 
-    virtual void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, const Context & context, bool throw_if_noop = true) = 0;
-    virtual PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, const Context & context) = 0;
-    virtual void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & context) = 0;
-    virtual void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & context) = 0;
+    virtual void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, ContextPtr context, bool throw_if_noop = true) = 0;
+    virtual PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, ContextPtr context) = 0;
+    virtual void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr context) = 0;
+    virtual void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr context) = 0;
 
     /// Makes sense only for replicated tables
-    virtual void fetchPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, const String & from, const Context & query_context);
+    virtual void fetchPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, const String & from, ContextPtr query_context);
 
     void writePartLog(
         PartLogElement::Type type,
@@ -1048,7 +1045,7 @@ private:
     mutable std::mutex query_id_set_mutex;
 
     // Get partition matcher for FREEZE / UNFREEZE queries.
-    MatcherFn getPartitionMatcher(const ASTPtr & partition, const Context & context) const;
+    MatcherFn getPartitionMatcher(const ASTPtr & partition, ContextPtr context) const;
 };
 
 /// RAII struct to record big parts that are submerging or emerging.
diff --git a/src/Storages/MergeTree/MergeTreeDataMergerMutator.cpp b/src/Storages/MergeTree/MergeTreeDataMergerMutator.cpp
index 4269aa89ad1..dfebd88abe9 100644
--- a/src/Storages/MergeTree/MergeTreeDataMergerMutator.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataMergerMutator.cpp
@@ -651,7 +651,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
     MergeList::Entry & merge_entry,
     TableLockHolder &,
     time_t time_of_merge,
-    const Context & context,
+    ContextPtr context,
     const ReservationPtr & space_reservation,
     bool deduplicate,
     const Names & deduplicate_by_columns)
@@ -751,7 +751,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
     /// deadlock is impossible.
     auto compression_codec = data.getCompressionCodecForPart(merge_entry->total_size_bytes_compressed, new_data_part->ttl_infos, time_of_merge);
 
-    auto tmp_disk = context.getTemporaryVolume()->getDisk();
+    auto tmp_disk = context->getTemporaryVolume()->getDisk();
     String rows_sources_file_path;
     std::unique_ptr<WriteBufferFromFileBase> rows_sources_uncompressed_write_buf;
     std::unique_ptr<WriteBuffer> rows_sources_write_buf;
@@ -910,7 +910,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
     {
         const auto & indices = metadata_snapshot->getSecondaryIndices();
         merged_stream = std::make_shared<ExpressionBlockInputStream>(
-            merged_stream, indices.getSingleExpressionForIndices(metadata_snapshot->getColumns(), data.global_context));
+            merged_stream, indices.getSingleExpressionForIndices(metadata_snapshot->getColumns(), data.getContext()));
         merged_stream = std::make_shared<MaterializingBlockInputStream>(merged_stream);
     }
 
@@ -1099,7 +1099,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mutatePartToTempor
     const MutationCommands & commands,
     MergeListEntry & merge_entry,
     time_t time_of_mutation,
-    const Context & context,
+    ContextPtr context,
     const ReservationPtr & space_reservation,
     TableLockHolder &)
 {
@@ -1113,12 +1113,12 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mutatePartToTempor
     const auto & source_part = future_part.parts[0];
     auto storage_from_source_part = StorageFromMergeTreeDataPart::create(source_part);
 
-    auto context_for_reading = context;
-    context_for_reading.setSetting("max_streams_to_max_threads_ratio", 1);
-    context_for_reading.setSetting("max_threads", 1);
+    auto context_for_reading = Context::createCopy(context);
+    context_for_reading->setSetting("max_streams_to_max_threads_ratio", 1);
+    context_for_reading->setSetting("max_threads", 1);
     /// Allow mutations to work when force_index_by_date or force_primary_key is on.
-    context_for_reading.setSetting("force_index_by_date", Field(0));
-    context_for_reading.setSetting("force_primary_key", Field(0));
+    context_for_reading->setSetting("force_index_by_date", Field(0));
+    context_for_reading->setSetting("force_primary_key", Field(0));
 
     MutationCommands commands_for_part;
     for (const auto & command : commands)
@@ -1129,7 +1129,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mutatePartToTempor
     }
 
     if (source_part->isStoredOnDisk() && !isStorageTouchedByMutations(
-        storage_from_source_part, metadata_snapshot, commands_for_part, context_for_reading))
+        storage_from_source_part, metadata_snapshot, commands_for_part, Context::createCopy(context_for_reading)))
     {
         LOG_TRACE(log, "Part {} doesn't change up to mutation version {}", source_part->name, future_part.part_info.mutation);
         return data.cloneAndLoadDataPartOnSameDisk(source_part, "tmp_clone_", future_part.part_info, metadata_snapshot);
@@ -1690,7 +1690,7 @@ std::set<MergeTreeIndexPtr> MergeTreeDataMergerMutator::getIndicesToRecalculate(
     BlockInputStreamPtr & input_stream,
     const NamesAndTypesList & updated_columns,
     const StorageMetadataPtr & metadata_snapshot,
-    const Context & context)
+    ContextPtr context)
 {
     /// Checks if columns used in skipping indexes modified.
     const auto & index_factory = MergeTreeIndexFactory::instance();
diff --git a/src/Storages/MergeTree/MergeTreeDataMergerMutator.h b/src/Storages/MergeTree/MergeTreeDataMergerMutator.h
index 2f3a898ba84..d4dc0ce8499 100644
--- a/src/Storages/MergeTree/MergeTreeDataMergerMutator.h
+++ b/src/Storages/MergeTree/MergeTreeDataMergerMutator.h
@@ -125,7 +125,7 @@ public:
         MergeListEntry & merge_entry,
         TableLockHolder & table_lock_holder,
         time_t time_of_merge,
-        const Context & context,
+        ContextPtr context,
         const ReservationPtr & space_reservation,
         bool deduplicate,
         const Names & deduplicate_by_columns);
@@ -137,7 +137,7 @@ public:
         const MutationCommands & commands,
         MergeListEntry & merge_entry,
         time_t time_of_mutation,
-        const Context & context,
+        ContextPtr context,
         const ReservationPtr & space_reservation,
         TableLockHolder & table_lock_holder);
 
@@ -199,7 +199,7 @@ private:
         BlockInputStreamPtr & input_stream,
         const NamesAndTypesList & updated_columns,
         const StorageMetadataPtr & metadata_snapshot,
-        const Context & context);
+        ContextPtr context);
 
     /// Override all columns of new part using mutating_stream
     void mutateAllPartColumns(
diff --git a/src/Storages/MergeTree/MergeTreeDataPartInMemory.cpp b/src/Storages/MergeTree/MergeTreeDataPartInMemory.cpp
index 96fa411339c..045ab488ada 100644
--- a/src/Storages/MergeTree/MergeTreeDataPartInMemory.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataPartInMemory.cpp
@@ -88,7 +88,7 @@ void MergeTreeDataPartInMemory::flushToDisk(const String & base_path, const Stri
 
     disk->createDirectories(destination_path);
 
-    auto compression_codec = storage.global_context.chooseCompressionCodec(0, 0);
+    auto compression_codec = storage.getContext()->chooseCompressionCodec(0, 0);
     auto indices = MergeTreeIndexFactory::instance().getMany(metadata_snapshot->getSecondaryIndices());
     MergedBlockOutputStream out(new_data_part, metadata_snapshot, columns, indices, compression_codec);
     out.writePrefix();
diff --git a/src/Storages/MergeTree/MergeTreeDataPartWriterWide.cpp b/src/Storages/MergeTree/MergeTreeDataPartWriterWide.cpp
index a2f7440b2e3..a1691fe7931 100644
--- a/src/Storages/MergeTree/MergeTreeDataPartWriterWide.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataPartWriterWide.cpp
@@ -337,7 +337,7 @@ void MergeTreeDataPartWriterWide::writeColumn(
         serializations[name]->serializeBinaryBulkStatePrefix(serialize_settings, it->second);
     }
 
-    const auto & global_settings = storage.global_context.getSettingsRef();
+    const auto & global_settings = storage.getContext()->getSettingsRef();
     ISerialization::SerializeBinaryBulkSettings serialize_settings;
     serialize_settings.getter = createStreamGetter(name_and_type, offset_columns);
     serialize_settings.low_cardinality_max_dictionary_size = global_settings.low_cardinality_max_dictionary_size;
@@ -501,7 +501,7 @@ void MergeTreeDataPartWriterWide::validateColumnOfFixedSize(const String & name,
 
 void MergeTreeDataPartWriterWide::finishDataSerialization(IMergeTreeDataPart::Checksums & checksums, bool sync)
 {
-    const auto & global_settings = storage.global_context.getSettingsRef();
+    const auto & global_settings = storage.getContext()->getSettingsRef();
     ISerialization::SerializeBinaryBulkSettings serialize_settings;
     serialize_settings.low_cardinality_max_dictionary_size = global_settings.low_cardinality_max_dictionary_size;
     serialize_settings.low_cardinality_use_single_dictionary_for_part = global_settings.low_cardinality_use_single_dictionary_for_part != 0;
diff --git a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
index fa415c9fd15..ddb140989f6 100644
--- a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
@@ -152,7 +152,7 @@ QueryPlanPtr MergeTreeDataSelectExecutor::read(
     const Names & column_names_to_return,
     const StorageMetadataPtr & metadata_snapshot,
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     const UInt64 max_block_size,
     const unsigned num_streams,
     const PartitionIdToMaxBlock * max_block_numbers_to_read) const
@@ -168,7 +168,7 @@ QueryPlanPtr MergeTreeDataSelectExecutor::readFromParts(
     const Names & column_names_to_return,
     const StorageMetadataPtr & metadata_snapshot,
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     const UInt64 max_block_size,
     const unsigned num_streams,
     const PartitionIdToMaxBlock * max_block_numbers_to_read) const
@@ -238,7 +238,7 @@ QueryPlanPtr MergeTreeDataSelectExecutor::readFromParts(
 
     metadata_snapshot->check(real_column_names, data.getVirtuals(), data.getStorageID());
 
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     const auto & primary_key = metadata_snapshot->getPrimaryKey();
     Names primary_key_columns = primary_key.column_names;
 
@@ -280,9 +280,9 @@ QueryPlanPtr MergeTreeDataSelectExecutor::readFromParts(
         }
     }
 
-    const Context & query_context = context.hasQueryContext() ? context.getQueryContext() : context;
+    auto query_context = context->hasQueryContext() ? context->getQueryContext() : context;
 
-    if (query_context.getSettingsRef().allow_experimental_query_deduplication)
+    if (query_context->getSettingsRef().allow_experimental_query_deduplication)
         selectPartsToReadWithUUIDFilter(parts, part_values, minmax_idx_condition, minmax_columns_types, partition_pruner, max_block_numbers_to_read, query_context);
     else
         selectPartsToRead(parts, part_values, minmax_idx_condition, minmax_columns_types, partition_pruner, max_block_numbers_to_read);
@@ -556,7 +556,7 @@ QueryPlanPtr MergeTreeDataSelectExecutor::readFromParts(
     {
         .min_bytes_to_use_direct_io = settings.min_bytes_to_use_direct_io,
         .min_bytes_to_use_mmap_io = settings.min_bytes_to_use_mmap_io,
-        .mmap_cache = context.getMMappedFileCache(),
+        .mmap_cache = context->getMMappedFileCache(),
         .max_read_buffer_size = settings.max_read_buffer_size,
         .save_marks_in_cache = true,
         .checksum_on_read = settings.checksum_on_read,
@@ -776,7 +776,7 @@ QueryPlanPtr MergeTreeDataSelectExecutor::readFromParts(
         if (data_settings->min_marks_to_honor_max_concurrent_queries > 0
             && sum_marks >= data_settings->min_marks_to_honor_max_concurrent_queries)
         {
-            query_id = context.getCurrentQueryId();
+            query_id = context->getCurrentQueryId();
             if (!query_id.empty())
                 data.insertQueryIdOrThrow(query_id, data_settings->max_concurrent_queries);
         }
@@ -1937,16 +1937,13 @@ void MergeTreeDataSelectExecutor::selectPartsToReadWithUUIDFilter(
     const DataTypes & minmax_columns_types,
     std::optional<PartitionPruner> & partition_pruner,
     const PartitionIdToMaxBlock * max_block_numbers_to_read,
-    const Context & query_context) const
+    ContextPtr query_context) const
 {
-    /// const_cast to add UUIDs to context. Bad practice.
-    Context & non_const_context = const_cast<Context &>(query_context);
-
     /// process_parts prepare parts that have to be read for the query,
     /// returns false if duplicated parts' UUID have been met
     auto select_parts = [&] (MergeTreeData::DataPartsVector & selected_parts) -> bool
     {
-        auto ignored_part_uuids = non_const_context.getIgnoredPartUUIDs();
+        auto ignored_part_uuids = query_context->getIgnoredPartUUIDs();
         std::unordered_set<UUID> temp_part_uuids;
 
         auto prev_parts = selected_parts;
@@ -1995,12 +1992,12 @@ void MergeTreeDataSelectExecutor::selectPartsToReadWithUUIDFilter(
 
         if (!temp_part_uuids.empty())
         {
-            auto duplicates = non_const_context.getPartUUIDs()->add(std::vector<UUID>{temp_part_uuids.begin(), temp_part_uuids.end()});
+            auto duplicates = query_context->getPartUUIDs()->add(std::vector<UUID>{temp_part_uuids.begin(), temp_part_uuids.end()});
             if (!duplicates.empty())
             {
                 /// on a local replica with prefer_localhost_replica=1 if any duplicates appeared during the first pass,
                 /// adding them to the exclusion, so they will be skipped on second pass
-                non_const_context.getIgnoredPartUUIDs()->add(duplicates);
+                query_context->getIgnoredPartUUIDs()->add(duplicates);
                 return false;
             }
         }
diff --git a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.h b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.h
index 0702605a539..927a82b738f 100644
--- a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.h
+++ b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.h
@@ -29,7 +29,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         UInt64 max_block_size,
         unsigned num_streams,
         const PartitionIdToMaxBlock * max_block_numbers_to_read = nullptr) const;
@@ -39,7 +39,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         UInt64 max_block_size,
         unsigned num_streams,
         const PartitionIdToMaxBlock * max_block_numbers_to_read = nullptr) const;
@@ -141,7 +141,7 @@ private:
         const DataTypes & minmax_columns_types,
         std::optional<PartitionPruner> & partition_pruner,
         const PartitionIdToMaxBlock * max_block_numbers_to_read,
-        const Context & query_context) const;
+        ContextPtr query_context) const;
 };
 
 }
diff --git a/src/Storages/MergeTree/MergeTreeDataWriter.cpp b/src/Storages/MergeTree/MergeTreeDataWriter.cpp
index 3b4cb385a34..79d95eb03ee 100644
--- a/src/Storages/MergeTree/MergeTreeDataWriter.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataWriter.cpp
@@ -396,7 +396,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataWriter::writeTempPart(BlockWithPa
 
     /// This effectively chooses minimal compression method:
     ///  either default lz4 or compression method with zero thresholds on absolute and relative part size.
-    auto compression_codec = data.global_context.chooseCompressionCodec(0, 0);
+    auto compression_codec = data.getContext()->chooseCompressionCodec(0, 0);
 
     const auto & index_factory = MergeTreeIndexFactory::instance();
     MergedBlockOutputStream out(new_data_part, metadata_snapshot, columns, index_factory.getMany(metadata_snapshot->getSecondaryIndices()), compression_codec);
diff --git a/src/Storages/MergeTree/MergeTreeIndexBloomFilter.cpp b/src/Storages/MergeTree/MergeTreeIndexBloomFilter.cpp
index a98ba16978d..c37d710ec8f 100644
--- a/src/Storages/MergeTree/MergeTreeIndexBloomFilter.cpp
+++ b/src/Storages/MergeTree/MergeTreeIndexBloomFilter.cpp
@@ -67,7 +67,7 @@ MergeTreeIndexAggregatorPtr MergeTreeIndexBloomFilter::createIndexAggregator() c
     return std::make_shared<MergeTreeIndexAggregatorBloomFilter>(bits_per_row, hash_functions, index.column_names);
 }
 
-MergeTreeIndexConditionPtr MergeTreeIndexBloomFilter::createIndexCondition(const SelectQueryInfo & query_info, const Context & context) const
+MergeTreeIndexConditionPtr MergeTreeIndexBloomFilter::createIndexCondition(const SelectQueryInfo & query_info, ContextPtr context) const
 {
     return std::make_shared<MergeTreeIndexConditionBloomFilter>(query_info, context, index.sample_block, hash_functions);
 }
diff --git a/src/Storages/MergeTree/MergeTreeIndexBloomFilter.h b/src/Storages/MergeTree/MergeTreeIndexBloomFilter.h
index 1aac2c22aa0..9112f23ee64 100644
--- a/src/Storages/MergeTree/MergeTreeIndexBloomFilter.h
+++ b/src/Storages/MergeTree/MergeTreeIndexBloomFilter.h
@@ -20,7 +20,7 @@ public:
 
     MergeTreeIndexAggregatorPtr createIndexAggregator() const override;
 
-    MergeTreeIndexConditionPtr createIndexCondition(const SelectQueryInfo & query_info, const Context & context) const override;
+    MergeTreeIndexConditionPtr createIndexCondition(const SelectQueryInfo & query_info, ContextPtr context) const override;
 
     bool mayBenefitFromIndexForIn(const ASTPtr & node) const override;
 
diff --git a/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.cpp b/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.cpp
index a9915f01645..031129a35f4 100644
--- a/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.cpp
+++ b/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.cpp
@@ -87,11 +87,11 @@ bool maybeTrueOnBloomFilter(const IColumn * hash_column, const BloomFilterPtr &
 }
 
 MergeTreeIndexConditionBloomFilter::MergeTreeIndexConditionBloomFilter(
-    const SelectQueryInfo & info_, const Context & context_, const Block & header_, size_t hash_functions_)
-    : header(header_), context(context_), query_info(info_), hash_functions(hash_functions_)
+    const SelectQueryInfo & info_, ContextPtr context_, const Block & header_, size_t hash_functions_)
+    : WithContext(context_), header(header_), query_info(info_), hash_functions(hash_functions_)
 {
-    auto atom_from_ast = [this](auto & node, auto &, auto & constants, auto & out) { return traverseAtomAST(node, constants, out); };
-    rpn = std::move(RPNBuilder<RPNElement>(info_, context, atom_from_ast).extractRPN());
+    auto atom_from_ast = [this](auto & node, auto, auto & constants, auto & out) { return traverseAtomAST(node, constants, out); };
+    rpn = std::move(RPNBuilder<RPNElement>(info_, getContext(), atom_from_ast).extractRPN());
 }
 
 bool MergeTreeIndexConditionBloomFilter::alwaysUnknownOrTrue() const
diff --git a/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.h b/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.h
index 0b02e64d43c..61e796fb6f7 100644
--- a/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.h
+++ b/src/Storages/MergeTree/MergeTreeIndexConditionBloomFilter.h
@@ -13,7 +13,7 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-class MergeTreeIndexConditionBloomFilter final : public IMergeTreeIndexCondition
+class MergeTreeIndexConditionBloomFilter final : public IMergeTreeIndexCondition, WithContext
 {
 public:
     struct RPNElement
@@ -42,7 +42,7 @@ public:
         std::vector<std::pair<size_t, ColumnPtr>> predicate;
     };
 
-    MergeTreeIndexConditionBloomFilter(const SelectQueryInfo & info_, const Context & context_, const Block & header_, size_t hash_functions_);
+    MergeTreeIndexConditionBloomFilter(const SelectQueryInfo & info_, ContextPtr context_, const Block & header_, size_t hash_functions_);
 
     bool alwaysUnknownOrTrue() const override;
 
@@ -56,7 +56,6 @@ public:
 
 private:
     const Block & header;
-    const Context & context;
     const SelectQueryInfo & query_info;
     const size_t hash_functions;
     std::vector<RPNElement> rpn;
diff --git a/src/Storages/MergeTree/MergeTreeIndexFullText.cpp b/src/Storages/MergeTree/MergeTreeIndexFullText.cpp
index 419a417c3e8..10136cd1069 100644
--- a/src/Storages/MergeTree/MergeTreeIndexFullText.cpp
+++ b/src/Storages/MergeTree/MergeTreeIndexFullText.cpp
@@ -166,7 +166,7 @@ void MergeTreeIndexAggregatorFullText::update(const Block & block, size_t * pos,
 
 MergeTreeConditionFullText::MergeTreeConditionFullText(
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     const Block & index_sample_block,
     const BloomFilterParameters & params_,
     TokenExtractorPtr token_extactor_)
@@ -179,7 +179,7 @@ MergeTreeConditionFullText::MergeTreeConditionFullText(
     rpn = std::move(
             RPNBuilder<RPNElement>(
                     query_info, context,
-                    [this] (const ASTPtr & node, const Context & /* context */, Block & block_with_constants, RPNElement & out) -> bool
+                    [this] (const ASTPtr & node, ContextPtr /* context */, Block & block_with_constants, RPNElement & out) -> bool
                     {
                         return this->atomFromAST(node, block_with_constants, out);
                     }).extractRPN());
@@ -566,7 +566,7 @@ MergeTreeIndexAggregatorPtr MergeTreeIndexFullText::createIndexAggregator() cons
 }
 
 MergeTreeIndexConditionPtr MergeTreeIndexFullText::createIndexCondition(
-        const SelectQueryInfo & query, const Context & context) const
+        const SelectQueryInfo & query, ContextPtr context) const
 {
     return std::make_shared<MergeTreeConditionFullText>(query, context, index.sample_block, params, token_extractor.get());
 };
diff --git a/src/Storages/MergeTree/MergeTreeIndexFullText.h b/src/Storages/MergeTree/MergeTreeIndexFullText.h
index d861751c7df..1385621f97f 100644
--- a/src/Storages/MergeTree/MergeTreeIndexFullText.h
+++ b/src/Storages/MergeTree/MergeTreeIndexFullText.h
@@ -87,7 +87,7 @@ class MergeTreeConditionFullText final : public IMergeTreeIndexCondition
 public:
     MergeTreeConditionFullText(
             const SelectQueryInfo & query_info,
-            const Context & context,
+            ContextPtr context,
             const Block & index_sample_block,
             const BloomFilterParameters & params_,
             TokenExtractorPtr token_extactor_);
@@ -208,7 +208,7 @@ public:
     MergeTreeIndexAggregatorPtr createIndexAggregator() const override;
 
     MergeTreeIndexConditionPtr createIndexCondition(
-            const SelectQueryInfo & query, const Context & context) const override;
+            const SelectQueryInfo & query, ContextPtr context) const override;
 
     bool mayBenefitFromIndexForIn(const ASTPtr & node) const override;
 
diff --git a/src/Storages/MergeTree/MergeTreeIndexMinMax.cpp b/src/Storages/MergeTree/MergeTreeIndexMinMax.cpp
index e8b526d1426..099d561cf80 100644
--- a/src/Storages/MergeTree/MergeTreeIndexMinMax.cpp
+++ b/src/Storages/MergeTree/MergeTreeIndexMinMax.cpp
@@ -138,7 +138,7 @@ void MergeTreeIndexAggregatorMinMax::update(const Block & block, size_t * pos, s
 MergeTreeIndexConditionMinMax::MergeTreeIndexConditionMinMax(
     const IndexDescription & index,
     const SelectQueryInfo & query,
-    const Context & context)
+    ContextPtr context)
     : index_data_types(index.data_types)
     , condition(query, context, index.column_names, index.expression)
 {
@@ -175,7 +175,7 @@ MergeTreeIndexAggregatorPtr MergeTreeIndexMinMax::createIndexAggregator() const
 }
 
 MergeTreeIndexConditionPtr MergeTreeIndexMinMax::createIndexCondition(
-    const SelectQueryInfo & query, const Context & context) const
+    const SelectQueryInfo & query, ContextPtr context) const
 {
     return std::make_shared<MergeTreeIndexConditionMinMax>(index, query, context);
 };
diff --git a/src/Storages/MergeTree/MergeTreeIndexMinMax.h b/src/Storages/MergeTree/MergeTreeIndexMinMax.h
index 8d782d9a7dc..97b9b874484 100644
--- a/src/Storages/MergeTree/MergeTreeIndexMinMax.h
+++ b/src/Storages/MergeTree/MergeTreeIndexMinMax.h
@@ -52,7 +52,7 @@ public:
     MergeTreeIndexConditionMinMax(
         const IndexDescription & index,
         const SelectQueryInfo & query,
-        const Context & context);
+        ContextPtr context);
 
     bool alwaysUnknownOrTrue() const override;
 
@@ -78,7 +78,7 @@ public:
     MergeTreeIndexAggregatorPtr createIndexAggregator() const override;
 
     MergeTreeIndexConditionPtr createIndexCondition(
-        const SelectQueryInfo & query, const Context & context) const override;
+        const SelectQueryInfo & query, ContextPtr context) const override;
 
     bool mayBenefitFromIndexForIn(const ASTPtr & node) const override;
 };
diff --git a/src/Storages/MergeTree/MergeTreeIndexSet.cpp b/src/Storages/MergeTree/MergeTreeIndexSet.cpp
index 4ab6ae01c8c..e7578027598 100644
--- a/src/Storages/MergeTree/MergeTreeIndexSet.cpp
+++ b/src/Storages/MergeTree/MergeTreeIndexSet.cpp
@@ -241,7 +241,7 @@ MergeTreeIndexConditionSet::MergeTreeIndexConditionSet(
     const Block & index_sample_block_,
     size_t max_rows_,
     const SelectQueryInfo & query,
-    const Context & context)
+    ContextPtr context)
     : index_name(index_name_)
     , max_rows(max_rows_)
     , index_sample_block(index_sample_block_)
@@ -474,7 +474,7 @@ MergeTreeIndexAggregatorPtr MergeTreeIndexSet::createIndexAggregator() const
 }
 
 MergeTreeIndexConditionPtr MergeTreeIndexSet::createIndexCondition(
-    const SelectQueryInfo & query, const Context & context) const
+    const SelectQueryInfo & query, ContextPtr context) const
 {
     return std::make_shared<MergeTreeIndexConditionSet>(index.name, index.sample_block, max_rows, query, context);
 };
diff --git a/src/Storages/MergeTree/MergeTreeIndexSet.h b/src/Storages/MergeTree/MergeTreeIndexSet.h
index 90389264d53..28afe4f714d 100644
--- a/src/Storages/MergeTree/MergeTreeIndexSet.h
+++ b/src/Storages/MergeTree/MergeTreeIndexSet.h
@@ -87,7 +87,7 @@ public:
         const Block & index_sample_block_,
         size_t max_rows_,
         const SelectQueryInfo & query,
-        const Context & context);
+        ContextPtr context);
 
     bool alwaysUnknownOrTrue() const override;
 
@@ -129,7 +129,7 @@ public:
     MergeTreeIndexAggregatorPtr createIndexAggregator() const override;
 
     MergeTreeIndexConditionPtr createIndexCondition(
-            const SelectQueryInfo & query, const Context & context) const override;
+            const SelectQueryInfo & query, ContextPtr context) const override;
 
     bool mayBenefitFromIndexForIn(const ASTPtr & node) const override;
 
diff --git a/src/Storages/MergeTree/MergeTreeIndices.h b/src/Storages/MergeTree/MergeTreeIndices.h
index c7b9dfb123e..674daeb480d 100644
--- a/src/Storages/MergeTree/MergeTreeIndices.h
+++ b/src/Storages/MergeTree/MergeTreeIndices.h
@@ -84,7 +84,7 @@ struct IMergeTreeIndex
     virtual MergeTreeIndexAggregatorPtr createIndexAggregator() const = 0;
 
     virtual MergeTreeIndexConditionPtr createIndexCondition(
-            const SelectQueryInfo & query_info, const Context & context) const = 0;
+            const SelectQueryInfo & query_info, ContextPtr context) const = 0;
 
     Names getColumnsRequiredForIndexCalc() const { return index.expression->getRequiredColumns(); }
 
diff --git a/src/Storages/MergeTree/MergeTreeReverseSelectProcessor.cpp b/src/Storages/MergeTree/MergeTreeReverseSelectProcessor.cpp
index 02752908576..1d3bb55eace 100644
--- a/src/Storages/MergeTree/MergeTreeReverseSelectProcessor.cpp
+++ b/src/Storages/MergeTree/MergeTreeReverseSelectProcessor.cpp
@@ -62,9 +62,9 @@ MergeTreeReverseSelectProcessor::MergeTreeReverseSelectProcessor(
     column_name_set = NameSet{column_names.begin(), column_names.end()};
 
     if (use_uncompressed_cache)
-        owned_uncompressed_cache = storage.global_context.getUncompressedCache();
+        owned_uncompressed_cache = storage.getContext()->getUncompressedCache();
 
-    owned_mark_cache = storage.global_context.getMarkCache();
+    owned_mark_cache = storage.getContext()->getMarkCache();
 
     reader = data_part->getReader(task_columns.columns, metadata_snapshot,
         all_mark_ranges, owned_uncompressed_cache.get(),
diff --git a/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp b/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp
index 65f9b1eba3b..47429745b0d 100644
--- a/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp
+++ b/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp
@@ -87,9 +87,9 @@ try
     if (!reader)
     {
         if (use_uncompressed_cache)
-            owned_uncompressed_cache = storage.global_context.getUncompressedCache();
+            owned_uncompressed_cache = storage.getContext()->getUncompressedCache();
 
-        owned_mark_cache = storage.global_context.getMarkCache();
+        owned_mark_cache = storage.getContext()->getMarkCache();
 
         reader = data_part->getReader(task_columns.columns, metadata_snapshot, all_mark_ranges,
             owned_uncompressed_cache.get(), owned_mark_cache.get(), reader_settings);
diff --git a/src/Storages/MergeTree/MergeTreeSequentialSource.cpp b/src/Storages/MergeTree/MergeTreeSequentialSource.cpp
index edd63aadd29..745a2860c56 100644
--- a/src/Storages/MergeTree/MergeTreeSequentialSource.cpp
+++ b/src/Storages/MergeTree/MergeTreeSequentialSource.cpp
@@ -23,7 +23,7 @@ MergeTreeSequentialSource::MergeTreeSequentialSource(
     , data_part(std::move(data_part_))
     , columns_to_read(std::move(columns_to_read_))
     , read_with_direct_io(read_with_direct_io_)
-    , mark_cache(storage.global_context.getMarkCache())
+    , mark_cache(storage.getContext()->getMarkCache())
 {
     if (!quiet)
     {
diff --git a/src/Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.cpp b/src/Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.cpp
index f57247e39ab..ba9216ac1b0 100644
--- a/src/Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.cpp
+++ b/src/Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.cpp
@@ -71,8 +71,8 @@ bool MergeTreeThreadSelectBlockInputProcessor::getNewTask()
         auto rest_mark_ranges = pool->getRestMarks(*task->data_part, task->mark_ranges[0]);
 
         if (use_uncompressed_cache)
-            owned_uncompressed_cache = storage.global_context.getUncompressedCache();
-        owned_mark_cache = storage.global_context.getMarkCache();
+            owned_uncompressed_cache = storage.getContext()->getUncompressedCache();
+        owned_mark_cache = storage.getContext()->getMarkCache();
 
         reader = task->data_part->getReader(task->columns, metadata_snapshot, rest_mark_ranges,
             owned_uncompressed_cache.get(), owned_mark_cache.get(), reader_settings,
diff --git a/src/Storages/MergeTree/MergeTreeWhereOptimizer.cpp b/src/Storages/MergeTree/MergeTreeWhereOptimizer.cpp
index f0f178cb71c..50f8266a2a0 100644
--- a/src/Storages/MergeTree/MergeTreeWhereOptimizer.cpp
+++ b/src/Storages/MergeTree/MergeTreeWhereOptimizer.cpp
@@ -29,7 +29,7 @@ static constexpr auto threshold = 2;
 
 MergeTreeWhereOptimizer::MergeTreeWhereOptimizer(
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     std::unordered_map<std::string, UInt64> column_sizes_,
     const StorageMetadataPtr & metadata_snapshot,
     const Names & queried_columns_,
diff --git a/src/Storages/MergeTree/MergeTreeWhereOptimizer.h b/src/Storages/MergeTree/MergeTreeWhereOptimizer.h
index 8fd973e9ba3..0559fdee2ae 100644
--- a/src/Storages/MergeTree/MergeTreeWhereOptimizer.h
+++ b/src/Storages/MergeTree/MergeTreeWhereOptimizer.h
@@ -1,12 +1,15 @@
 #pragma once
 
-#include <memory>
-#include <unordered_map>
-#include <set>
-#include <boost/noncopyable.hpp>
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 #include <Storages/SelectQueryInfo.h>
 
+#include <boost/noncopyable.hpp>
+
+#include <memory>
+#include <set>
+#include <unordered_map>
+
 
 namespace Poco { class Logger; }
 
@@ -32,7 +35,7 @@ class MergeTreeWhereOptimizer : private boost::noncopyable
 public:
     MergeTreeWhereOptimizer(
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         std::unordered_map<std::string, UInt64> column_sizes_,
         const StorageMetadataPtr & metadata_snapshot,
         const Names & queried_columns_,
diff --git a/src/Storages/MergeTree/MergeTreeWriteAheadLog.cpp b/src/Storages/MergeTree/MergeTreeWriteAheadLog.cpp
index 4ca20572e90..4c92d4f6136 100644
--- a/src/Storages/MergeTree/MergeTreeWriteAheadLog.cpp
+++ b/src/Storages/MergeTree/MergeTreeWriteAheadLog.cpp
@@ -30,7 +30,7 @@ MergeTreeWriteAheadLog::MergeTreeWriteAheadLog(
     , disk(disk_)
     , name(name_)
     , path(storage.getRelativeDataPath() + name_)
-    , pool(storage.global_context.getSchedulePool())
+    , pool(storage.getContext()->getSchedulePool())
 {
     init();
     sync_task = pool.createTask("MergeTreeWriteAheadLog::sync", [this]
diff --git a/src/Storages/MergeTree/MergedBlockOutputStream.cpp b/src/Storages/MergeTree/MergedBlockOutputStream.cpp
index 6988d48b18c..ab364e0e5aa 100644
--- a/src/Storages/MergeTree/MergedBlockOutputStream.cpp
+++ b/src/Storages/MergeTree/MergedBlockOutputStream.cpp
@@ -26,7 +26,7 @@ MergedBlockOutputStream::MergedBlockOutputStream(
     , default_codec(default_codec_)
 {
     MergeTreeWriterSettings writer_settings(
-        storage.global_context.getSettings(),
+        storage.getContext()->getSettings(),
         storage.getSettings(),
         data_part->index_granularity_info.is_adaptive,
         /* rewrite_primary_key = */ true,
diff --git a/src/Storages/MergeTree/MergedColumnOnlyOutputStream.cpp b/src/Storages/MergeTree/MergedColumnOnlyOutputStream.cpp
index 41479f104f3..298c550d496 100644
--- a/src/Storages/MergeTree/MergedColumnOnlyOutputStream.cpp
+++ b/src/Storages/MergeTree/MergedColumnOnlyOutputStream.cpp
@@ -21,7 +21,7 @@ MergedColumnOnlyOutputStream::MergedColumnOnlyOutputStream(
     : IMergedBlockOutputStream(data_part, metadata_snapshot_)
     , header(header_)
 {
-    const auto & global_settings = data_part->storage.global_context.getSettings();
+    const auto & global_settings = data_part->storage.getContext()->getSettings();
     const auto & storage_settings = data_part->storage.getSettings();
 
     MergeTreeWriterSettings writer_settings(
diff --git a/src/Storages/MergeTree/PartitionPruner.h b/src/Storages/MergeTree/PartitionPruner.h
index 3cb7552c427..944461f4403 100644
--- a/src/Storages/MergeTree/PartitionPruner.h
+++ b/src/Storages/MergeTree/PartitionPruner.h
@@ -21,7 +21,7 @@ private:
     using DataPartPtr = std::shared_ptr<const DataPart>;
 
 public:
-    PartitionPruner(const KeyDescription & partition_key_, const SelectQueryInfo & query_info, const Context & context, bool strict)
+    PartitionPruner(const KeyDescription & partition_key_, const SelectQueryInfo & query_info, ContextPtr context, bool strict)
         : partition_key(partition_key_)
         , partition_condition(
               query_info, context, partition_key.column_names, partition_key.expression, true /* single_point */, strict)
diff --git a/src/Storages/MergeTree/RPNBuilder.h b/src/Storages/MergeTree/RPNBuilder.h
index 292a120d28a..d41c53eb106 100644
--- a/src/Storages/MergeTree/RPNBuilder.h
+++ b/src/Storages/MergeTree/RPNBuilder.h
@@ -1,35 +1,34 @@
 #pragma once
 
-#include <Common/typeid_cast.h>
 #include <Core/Block.h>
 #include <DataTypes/DataTypesNumber.h>
 #include <Parsers/ASTExpressionList.h>
-#include <Parsers/ASTSelectQuery.h>
 #include <Parsers/ASTFunction.h>
-#include <Storages/SelectQueryInfo.h>
+#include <Parsers/ASTSelectQuery.h>
 #include <Storages/MergeTree/KeyCondition.h>
+#include <Storages/SelectQueryInfo.h>
+#include <Common/typeid_cast.h>
 
 
 namespace DB
 {
-class Context;
 
 /// Builds reverse polish notation
 template <typename RPNElement>
-class RPNBuilder
+class RPNBuilder : WithContext
 {
 public:
     using RPN = std::vector<RPNElement>;
     using AtomFromASTFunc = std::function<
-            bool(const ASTPtr & node, const Context & context, Block & block_with_constants, RPNElement & out)>;
+            bool(const ASTPtr & node, ContextPtr context, Block & block_with_constants, RPNElement & out)>;
 
-    RPNBuilder(const SelectQueryInfo & query_info, const Context & context_, const AtomFromASTFunc & atomFromAST_)
-        : context(context_), atomFromAST(atomFromAST_)
+    RPNBuilder(const SelectQueryInfo & query_info, ContextPtr context_, const AtomFromASTFunc & atomFromAST_)
+        : WithContext(context_), atomFromAST(atomFromAST_)
     {
         /** Evaluation of expressions that depend only on constants.
           * For the index to be used, if it is written, for example `WHERE Date = toDate(now())`.
           */
-        block_with_constants = KeyCondition::getBlockWithConstants(query_info.query, query_info.syntax_analyzer_result, context);
+        block_with_constants = KeyCondition::getBlockWithConstants(query_info.query, query_info.syntax_analyzer_result, getContext());
 
         /// Transform WHERE section to Reverse Polish notation
         const ASTSelectQuery & select = typeid_cast<const ASTSelectQuery &>(*query_info.query);
@@ -80,7 +79,7 @@ private:
             }
         }
 
-        if (!atomFromAST(node, context, block_with_constants, element))
+        if (!atomFromAST(node, getContext(), block_with_constants, element))
         {
             element.function = RPNElement::FUNCTION_UNKNOWN;
         }
@@ -113,7 +112,6 @@ private:
         return true;
     }
 
-    const Context & context;
     const AtomFromASTFunc & atomFromAST;
     Block block_with_constants;
     RPN rpn;
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreeBlockOutputStream.cpp b/src/Storages/MergeTree/ReplicatedMergeTreeBlockOutputStream.cpp
index c9b66ff3a6c..df4f9124980 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreeBlockOutputStream.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreeBlockOutputStream.cpp
@@ -172,11 +172,11 @@ void ReplicatedMergeTreeBlockOutputStream::write(const Block & block)
 
             /// Set a special error code if the block is duplicate
             int error = (deduplicate && last_block_is_duplicate) ? ErrorCodes::INSERT_WAS_DEDUPLICATED : 0;
-            PartLog::addNewPart(storage.global_context, part, watch.elapsed(), ExecutionStatus(error));
+            PartLog::addNewPart(storage.getContext(), part, watch.elapsed(), ExecutionStatus(error));
         }
         catch (...)
         {
-            PartLog::addNewPart(storage.global_context, part, watch.elapsed(), ExecutionStatus::fromCurrentException(__PRETTY_FUNCTION__));
+            PartLog::addNewPart(storage.getContext(), part, watch.elapsed(), ExecutionStatus::fromCurrentException(__PRETTY_FUNCTION__));
             throw;
         }
     }
@@ -200,11 +200,11 @@ void ReplicatedMergeTreeBlockOutputStream::writeExistingPart(MergeTreeData::Muta
     try
     {
         commitPart(zookeeper, part, "");
-        PartLog::addNewPart(storage.global_context, part, watch.elapsed());
+        PartLog::addNewPart(storage.getContext(), part, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewPart(storage.global_context, part, watch.elapsed(), ExecutionStatus::fromCurrentException(__PRETTY_FUNCTION__));
+        PartLog::addNewPart(storage.getContext(), part, watch.elapsed(), ExecutionStatus::fromCurrentException(__PRETTY_FUNCTION__));
         throw;
     }
 }
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreeCleanupThread.cpp b/src/Storages/MergeTree/ReplicatedMergeTreeCleanupThread.cpp
index 701cb2fa1ed..792a77d5e1a 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreeCleanupThread.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreeCleanupThread.cpp
@@ -24,7 +24,7 @@ ReplicatedMergeTreeCleanupThread::ReplicatedMergeTreeCleanupThread(StorageReplic
     , log_name(storage.getStorageID().getFullTableName() + " (ReplicatedMergeTreeCleanupThread)")
     , log(&Poco::Logger::get(log_name))
 {
-    task = storage.global_context.getSchedulePool().createTask(log_name, [this]{ run(); });
+    task = storage.getContext()->getSchedulePool().createTask(log_name, [this]{ run(); });
 }
 
 void ReplicatedMergeTreeCleanupThread::run()
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp b/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp
index 95883c65abb..09b2a23767c 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp
@@ -28,7 +28,7 @@ ReplicatedMergeTreePartCheckThread::ReplicatedMergeTreePartCheckThread(StorageRe
     , log_name(storage.getStorageID().getFullTableName() + " (ReplicatedMergeTreePartCheckThread)")
     , log(&Poco::Logger::get(log_name))
 {
-    task = storage.global_context.getSchedulePool().createTask(log_name, [this] { run(); });
+    task = storage.getContext()->getSchedulePool().createTask(log_name, [this] { run(); });
     task->schedule();
 }
 
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreeRestartingThread.cpp b/src/Storages/MergeTree/ReplicatedMergeTreeRestartingThread.cpp
index b3cb7c92def..ca6ea3103d1 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreeRestartingThread.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreeRestartingThread.cpp
@@ -47,7 +47,7 @@ ReplicatedMergeTreeRestartingThread::ReplicatedMergeTreeRestartingThread(Storage
     const auto storage_settings = storage.getSettings();
     check_period_ms = storage_settings->zookeeper_session_expiration_check_period.totalSeconds() * 1000;
 
-    task = storage.global_context.getSchedulePool().createTask(log_name, [this]{ run(); });
+    task = storage.getContext()->getSchedulePool().createTask(log_name, [this]{ run(); });
 }
 
 void ReplicatedMergeTreeRestartingThread::run()
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.cpp b/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.cpp
index ac1c92849d5..de72ad1168b 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.cpp
@@ -205,7 +205,7 @@ void ReplicatedMergeTreeTableMetadata::checkImmutableFieldsEquals(const Replicat
 
 }
 
-void ReplicatedMergeTreeTableMetadata::checkEquals(const ReplicatedMergeTreeTableMetadata & from_zk, const ColumnsDescription & columns, const Context & context) const
+void ReplicatedMergeTreeTableMetadata::checkEquals(const ReplicatedMergeTreeTableMetadata & from_zk, const ColumnsDescription & columns, ContextPtr context) const
 {
 
     checkImmutableFieldsEquals(from_zk);
diff --git a/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.h b/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.h
index c1c34637664..f398547e992 100644
--- a/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.h
+++ b/src/Storages/MergeTree/ReplicatedMergeTreeTableMetadata.h
@@ -63,7 +63,7 @@ struct ReplicatedMergeTreeTableMetadata
         }
     };
 
-    void checkEquals(const ReplicatedMergeTreeTableMetadata & from_zk, const ColumnsDescription & columns, const Context & context) const;
+    void checkEquals(const ReplicatedMergeTreeTableMetadata & from_zk, const ColumnsDescription & columns, ContextPtr context) const;
 
     Diff checkAndFindDiff(const ReplicatedMergeTreeTableMetadata & from_zk) const;
 
diff --git a/src/Storages/MergeTree/StorageFromMergeTreeDataPart.h b/src/Storages/MergeTree/StorageFromMergeTreeDataPart.h
index b7579a3b7ea..9f1a28a1522 100644
--- a/src/Storages/MergeTree/StorageFromMergeTreeDataPart.h
+++ b/src/Storages/MergeTree/StorageFromMergeTreeDataPart.h
@@ -26,7 +26,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t max_block_size,
         unsigned num_streams) override
@@ -42,7 +42,7 @@ public:
     bool supportsIndexForIn() const override { return true; }
 
     bool mayBenefitFromIndexForIn(
-        const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & metadata_snapshot) const override
+        const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & metadata_snapshot) const override
     {
         return part->storage.mayBenefitFromIndexForIn(left_in_operand, query_context, metadata_snapshot);
     }
@@ -57,7 +57,7 @@ public:
         return part->info.partition_id;
     }
 
-    String getPartitionIDFromQuery(const ASTPtr & ast, const Context & context) const
+    String getPartitionIDFromQuery(const ASTPtr & ast, ContextPtr context) const
     {
         return part->storage.getPartitionIDFromQuery(ast, context);
     }
diff --git a/src/Storages/MergeTree/registerStorageMergeTree.cpp b/src/Storages/MergeTree/registerStorageMergeTree.cpp
index 6dd005736f0..862747abcb9 100644
--- a/src/Storages/MergeTree/registerStorageMergeTree.cpp
+++ b/src/Storages/MergeTree/registerStorageMergeTree.cpp
@@ -184,9 +184,9 @@ appendGraphitePattern(const Poco::Util::AbstractConfiguration & config, const St
     patterns.emplace_back(pattern);
 }
 
-static void setGraphitePatternsFromConfig(const Context & context, const String & config_element, Graphite::Params & params)
+static void setGraphitePatternsFromConfig(ContextPtr context, const String & config_element, Graphite::Params & params)
 {
-    const auto & config = context.getConfigRef();
+    const auto & config = context->getConfigRef();
 
     if (!config.has(config_element))
         throw Exception("No '" + config_element + "' element in configuration file", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
@@ -429,7 +429,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
                 /// Do not try evaluate array or tuple, because it's array or tuple of column identifiers.
                 if (arg_func->name == "array" || arg_func->name == "tuple")
                     continue;
-                Field value = evaluateConstantExpression(arg, args.local_context).first;
+                Field value = evaluateConstantExpression(arg, args.getLocalContext()).first;
                 arg = std::make_shared<ASTLiteral>(value);
             }
         }
@@ -481,9 +481,9 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         {
             /// Try use default values if arguments are not specified.
             /// Note: {uuid} macro works for ON CLUSTER queries when database engine is Atomic.
-            zookeeper_path = args.context.getConfigRef().getString("default_replica_path", "/clickhouse/tables/{uuid}/{shard}");
+            zookeeper_path = args.getContext()->getConfigRef().getString("default_replica_path", "/clickhouse/tables/{uuid}/{shard}");
             /// TODO maybe use hostname if {replica} is not defined?
-            replica_name = args.context.getConfigRef().getString("default_replica_name", "{replica}");
+            replica_name = args.getContext()->getConfigRef().getString("default_replica_name", "{replica}");
 
             /// Modify query, so default values will be written to metadata
             assert(arg_num == 0);
@@ -503,8 +503,8 @@ static StoragePtr create(const StorageFactory::Arguments & args)
             throw Exception("Expected two string literal arguments: zookeeper_path and replica_name", ErrorCodes::BAD_ARGUMENTS);
 
         /// Allow implicit {uuid} macros only for zookeeper_path in ON CLUSTER queries
-        bool is_on_cluster = args.local_context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
-        bool is_replicated_database = args.local_context.getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY &&
+        bool is_on_cluster = args.getLocalContext()->getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY;
+        bool is_replicated_database = args.getLocalContext()->getClientInfo().query_kind == ClientInfo::QueryKind::SECONDARY_QUERY &&
                                       DatabaseCatalog::instance().getDatabase(args.table_id.database_name)->getEngineName() == "Replicated";
         bool allow_uuid_macro = is_on_cluster || is_replicated_database || args.query.attach;
 
@@ -521,11 +521,11 @@ static StoragePtr create(const StorageFactory::Arguments & args)
             info.table_id = args.table_id;
             if (!allow_uuid_macro)
                 info.table_id.uuid = UUIDHelpers::Nil;
-            zookeeper_path = args.context.getMacros()->expand(zookeeper_path, info);
+            zookeeper_path = args.getContext()->getMacros()->expand(zookeeper_path, info);
 
             info.level = 0;
             info.table_id.uuid = UUIDHelpers::Nil;
-            replica_name = args.context.getMacros()->expand(replica_name, info);
+            replica_name = args.getContext()->getMacros()->expand(replica_name, info);
         }
 
         ast_zk_path->value = zookeeper_path;
@@ -537,11 +537,11 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         info.table_id = args.table_id;
         if (!allow_uuid_macro)
             info.table_id.uuid = UUIDHelpers::Nil;
-        zookeeper_path = args.context.getMacros()->expand(zookeeper_path, info);
+        zookeeper_path = args.getContext()->getMacros()->expand(zookeeper_path, info);
 
         info.level = 0;
         info.table_id.uuid = UUIDHelpers::Nil;
-        replica_name = args.context.getMacros()->expand(replica_name, info);
+        replica_name = args.getContext()->getMacros()->expand(replica_name, info);
 
         /// We do not allow renaming table with these macros in metadata, because zookeeper_path will be broken after RENAME TABLE.
         /// NOTE: it may happen if table was created by older version of ClickHouse (< 20.10) and macros was not unfolded on table creation
@@ -600,7 +600,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
             throw Exception(error_msg, ErrorCodes::BAD_ARGUMENTS);
 
         --arg_cnt;
-        setGraphitePatternsFromConfig(args.context, graphite_config_name, merging_params.graphite_params);
+        setGraphitePatternsFromConfig(args.getContext(), graphite_config_name, merging_params.graphite_params);
     }
     else if (merging_params.mode == MergeTreeData::MergingParams::VersionedCollapsing)
     {
@@ -629,9 +629,9 @@ static StoragePtr create(const StorageFactory::Arguments & args)
 
     std::unique_ptr<MergeTreeSettings> storage_settings;
     if (replicated)
-        storage_settings = std::make_unique<MergeTreeSettings>(args.context.getReplicatedMergeTreeSettings());
+        storage_settings = std::make_unique<MergeTreeSettings>(args.getContext()->getReplicatedMergeTreeSettings());
     else
-        storage_settings = std::make_unique<MergeTreeSettings>(args.context.getMergeTreeSettings());
+        storage_settings = std::make_unique<MergeTreeSettings>(args.getContext()->getMergeTreeSettings());
 
     if (is_extended_storage_def)
     {
@@ -642,7 +642,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         /// Partition key may be undefined, but despite this we store it's empty
         /// value in partition_key structure. MergeTree checks this case and use
         /// single default partition with name "all".
-        metadata.partition_key = KeyDescription::getKeyFromAST(partition_by_key, metadata.columns, args.context);
+        metadata.partition_key = KeyDescription::getKeyFromAST(partition_by_key, metadata.columns, args.getContext());
 
         /// PRIMARY KEY without ORDER BY is allowed and considered as ORDER BY.
         if (!args.storage_def->order_by && args.storage_def->primary_key)
@@ -660,33 +660,33 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         /// before storage creation. After that storage will just copy this
         /// column if sorting key will be changed.
         metadata.sorting_key = KeyDescription::getSortingKeyFromAST(
-            args.storage_def->order_by->ptr(), metadata.columns, args.context, merging_param_key_arg);
+            args.storage_def->order_by->ptr(), metadata.columns, args.getContext(), merging_param_key_arg);
 
         /// If primary key explicitly defined, than get it from AST
         if (args.storage_def->primary_key)
         {
-            metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->primary_key->ptr(), metadata.columns, args.context);
+            metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->primary_key->ptr(), metadata.columns, args.getContext());
         }
         else /// Otherwise we don't have explicit primary key and copy it from order by
         {
-            metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->order_by->ptr(), metadata.columns, args.context);
+            metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->order_by->ptr(), metadata.columns, args.getContext());
             /// and set it's definition_ast to nullptr (so isPrimaryKeyDefined()
             /// will return false but hasPrimaryKey() will return true.
             metadata.primary_key.definition_ast = nullptr;
         }
 
         if (args.storage_def->sample_by)
-            metadata.sampling_key = KeyDescription::getKeyFromAST(args.storage_def->sample_by->ptr(), metadata.columns, args.context);
+            metadata.sampling_key = KeyDescription::getKeyFromAST(args.storage_def->sample_by->ptr(), metadata.columns, args.getContext());
 
         if (args.storage_def->ttl_table)
         {
             metadata.table_ttl = TTLTableDescription::getTTLForTableFromAST(
-                args.storage_def->ttl_table->ptr(), metadata.columns, args.context, metadata.primary_key);
+                args.storage_def->ttl_table->ptr(), metadata.columns, args.getContext(), metadata.primary_key);
         }
 
         if (args.query.columns_list && args.query.columns_list->indices)
             for (auto & index : args.query.columns_list->indices->children)
-                metadata.secondary_indices.push_back(IndexDescription::getIndexFromAST(index, args.columns, args.context));
+                metadata.secondary_indices.push_back(IndexDescription::getIndexFromAST(index, args.columns, args.getContext()));
 
         if (args.query.columns_list && args.query.columns_list->constraints)
             for (auto & constraint : args.query.columns_list->constraints->children)
@@ -695,7 +695,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         auto column_ttl_asts = args.columns.getColumnTTLs();
         for (const auto & [name, ast] : column_ttl_asts)
         {
-            auto new_ttl_entry = TTLDescription::getTTLFromAST(ast, args.columns, args.context, metadata.primary_key);
+            auto new_ttl_entry = TTLDescription::getTTLFromAST(ast, args.columns, args.getContext(), metadata.primary_key);
             metadata.column_ttls_by_name[name] = new_ttl_entry;
         }
 
@@ -716,7 +716,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
 
         auto partition_by_ast = makeASTFunction("toYYYYMM", std::make_shared<ASTIdentifier>(date_column_name));
 
-        metadata.partition_key = KeyDescription::getKeyFromAST(partition_by_ast, metadata.columns, args.context);
+        metadata.partition_key = KeyDescription::getKeyFromAST(partition_by_ast, metadata.columns, args.getContext());
 
 
         ++arg_num;
@@ -724,7 +724,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         /// If there is an expression for sampling
         if (arg_cnt - arg_num == 3)
         {
-            metadata.sampling_key = KeyDescription::getKeyFromAST(engine_args[arg_num], metadata.columns, args.context);
+            metadata.sampling_key = KeyDescription::getKeyFromAST(engine_args[arg_num], metadata.columns, args.getContext());
             ++arg_num;
         }
 
@@ -734,10 +734,10 @@ static StoragePtr create(const StorageFactory::Arguments & args)
         /// before storage creation. After that storage will just copy this
         /// column if sorting key will be changed.
         metadata.sorting_key
-            = KeyDescription::getSortingKeyFromAST(engine_args[arg_num], metadata.columns, args.context, merging_param_key_arg);
+            = KeyDescription::getSortingKeyFromAST(engine_args[arg_num], metadata.columns, args.getContext(), merging_param_key_arg);
 
         /// In old syntax primary_key always equals to sorting key.
-        metadata.primary_key = KeyDescription::getKeyFromAST(engine_args[arg_num], metadata.columns, args.context);
+        metadata.primary_key = KeyDescription::getKeyFromAST(engine_args[arg_num], metadata.columns, args.getContext());
         /// But it's not explicitly defined, so we evaluate definition to
         /// nullptr
         metadata.primary_key.definition_ast = nullptr;
@@ -777,7 +777,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
             args.table_id,
             args.relative_data_path,
             metadata,
-            args.context,
+            args.getContext(),
             date_column_name,
             merging_params,
             std::move(storage_settings),
@@ -789,7 +789,7 @@ static StoragePtr create(const StorageFactory::Arguments & args)
             args.relative_data_path,
             metadata,
             args.attach,
-            args.context,
+            args.getContext(),
             date_column_name,
             merging_params,
             std::move(storage_settings),
diff --git a/src/Storages/RabbitMQ/RabbitMQBlockInputStream.cpp b/src/Storages/RabbitMQ/RabbitMQBlockInputStream.cpp
index c5c43440228..6c3d3a53c21 100644
--- a/src/Storages/RabbitMQ/RabbitMQBlockInputStream.cpp
+++ b/src/Storages/RabbitMQ/RabbitMQBlockInputStream.cpp
@@ -16,7 +16,7 @@ namespace DB
 RabbitMQBlockInputStream::RabbitMQBlockInputStream(
     StorageRabbitMQ & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
-    std::shared_ptr<Context> context_,
+    ContextPtr context_,
     const Names & columns,
     size_t max_block_size_,
     bool ack_in_suffix_)
@@ -91,7 +91,7 @@ Block RabbitMQBlockInputStream::readImpl()
     MutableColumns virtual_columns = virtual_header.cloneEmptyColumns();
 
     auto input_format = FormatFactory::instance().getInputFormat(
-            storage.getFormatName(), *buffer, non_virtual_header, *context, max_block_size);
+            storage.getFormatName(), *buffer, non_virtual_header, context, max_block_size);
 
     InputPort port(input_format->getPort().getHeader(), input_format.get());
     connect(input_format->getPort(), port);
diff --git a/src/Storages/RabbitMQ/RabbitMQBlockInputStream.h b/src/Storages/RabbitMQ/RabbitMQBlockInputStream.h
index 8b93ca4e911..5ce1c96bf33 100644
--- a/src/Storages/RabbitMQ/RabbitMQBlockInputStream.h
+++ b/src/Storages/RabbitMQ/RabbitMQBlockInputStream.h
@@ -15,7 +15,7 @@ public:
     RabbitMQBlockInputStream(
             StorageRabbitMQ & storage_,
             const StorageMetadataPtr & metadata_snapshot_,
-            std::shared_ptr<Context> context_,
+            ContextPtr context_,
             const Names & columns,
             size_t max_block_size_,
             bool ack_in_suffix = true);
@@ -38,7 +38,7 @@ public:
 private:
     StorageRabbitMQ & storage;
     StorageMetadataPtr metadata_snapshot;
-    std::shared_ptr<Context> context;
+    ContextPtr context;
     Names column_names;
     const size_t max_block_size;
     bool ack_in_suffix;
diff --git a/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.cpp b/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.cpp
index a987fff3c64..3c837cb95b1 100644
--- a/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.cpp
+++ b/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.cpp
@@ -11,7 +11,7 @@ namespace DB
 RabbitMQBlockOutputStream::RabbitMQBlockOutputStream(
     StorageRabbitMQ & storage_,
     const StorageMetadataPtr & metadata_snapshot_,
-    const Context & context_)
+    ContextPtr context_)
     : storage(storage_)
     , metadata_snapshot(metadata_snapshot_)
     , context(context_)
diff --git a/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.h b/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.h
index 7e5c22f9f39..3941875ea86 100644
--- a/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.h
+++ b/src/Storages/RabbitMQ/RabbitMQBlockOutputStream.h
@@ -11,7 +11,7 @@ class RabbitMQBlockOutputStream : public IBlockOutputStream
 {
 
 public:
-    explicit RabbitMQBlockOutputStream(StorageRabbitMQ & storage_, const StorageMetadataPtr & metadata_snapshot_, const Context & context_);
+    explicit RabbitMQBlockOutputStream(StorageRabbitMQ & storage_, const StorageMetadataPtr & metadata_snapshot_, ContextPtr context_);
 
     Block getHeader() const override;
 
@@ -22,7 +22,7 @@ public:
 private:
     StorageRabbitMQ & storage;
     StorageMetadataPtr metadata_snapshot;
-    const Context & context;
+    ContextPtr context;
     ProducerBufferPtr buffer;
     BlockOutputStreamPtr child;
 };
diff --git a/src/Storages/RabbitMQ/StorageRabbitMQ.cpp b/src/Storages/RabbitMQ/StorageRabbitMQ.cpp
index 0ecf85e5c3d..55629f2a205 100644
--- a/src/Storages/RabbitMQ/StorageRabbitMQ.cpp
+++ b/src/Storages/RabbitMQ/StorageRabbitMQ.cpp
@@ -70,31 +70,31 @@ namespace ExchangeType
 
 StorageRabbitMQ::StorageRabbitMQ(
         const StorageID & table_id_,
-        const Context & context_,
+        ContextPtr context_,
         const ColumnsDescription & columns_,
         std::unique_ptr<RabbitMQSettings> rabbitmq_settings_)
         : IStorage(table_id_)
-        , global_context(context_.getGlobalContext())
+        , WithContext(context_->getGlobalContext())
         , rabbitmq_settings(std::move(rabbitmq_settings_))
-        , exchange_name(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_exchange_name.value))
-        , format_name(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_format.value))
-        , exchange_type(defineExchangeType(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_exchange_type.value)))
-        , routing_keys(parseRoutingKeys(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_routing_key_list.value)))
+        , exchange_name(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_exchange_name.value))
+        , format_name(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_format.value))
+        , exchange_type(defineExchangeType(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_exchange_type.value)))
+        , routing_keys(parseRoutingKeys(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_routing_key_list.value)))
         , row_delimiter(rabbitmq_settings->rabbitmq_row_delimiter.value)
-        , schema_name(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_schema.value))
+        , schema_name(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_schema.value))
         , num_consumers(rabbitmq_settings->rabbitmq_num_consumers.value)
         , num_queues(rabbitmq_settings->rabbitmq_num_queues.value)
-        , queue_base(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_queue_base.value))
-        , deadletter_exchange(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_deadletter_exchange.value))
+        , queue_base(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_queue_base.value))
+        , deadletter_exchange(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_deadletter_exchange.value))
         , persistent(rabbitmq_settings->rabbitmq_persistent.value)
         , hash_exchange(num_consumers > 1 || num_queues > 1)
         , log(&Poco::Logger::get("StorageRabbitMQ (" + table_id_.table_name + ")"))
-        , address(global_context.getMacros()->expand(rabbitmq_settings->rabbitmq_host_port.value))
+        , address(getContext()->getMacros()->expand(rabbitmq_settings->rabbitmq_host_port.value))
         , parsed_address(parseAddress(address, 5672))
         , login_password(std::make_pair(
-                    global_context.getConfigRef().getString("rabbitmq.username"),
-                    global_context.getConfigRef().getString("rabbitmq.password")))
-        , vhost(global_context.getConfigRef().getString("rabbitmq.vhost", "/"))
+                    getContext()->getConfigRef().getString("rabbitmq.username"),
+                    getContext()->getConfigRef().getString("rabbitmq.password")))
+        , vhost(getContext()->getConfigRef().getString("rabbitmq.vhost", "/"))
         , semaphore(0, num_consumers)
         , unique_strbase(getRandomName())
         , queue_size(std::max(QUEUE_SIZE, static_cast<uint32_t>(getMaxBlockSize())))
@@ -106,18 +106,18 @@ StorageRabbitMQ::StorageRabbitMQ(
     storage_metadata.setColumns(columns_);
     setInMemoryMetadata(storage_metadata);
 
-    rabbitmq_context = addSettings(global_context);
+    rabbitmq_context = addSettings(getContext());
     rabbitmq_context->makeQueryContext();
 
     /// One looping task for all consumers as they share the same connection == the same handler == the same event loop
     event_handler->updateLoopState(Loop::STOP);
-    looping_task = global_context.getMessageBrokerSchedulePool().createTask("RabbitMQLoopingTask", [this]{ loopingFunc(); });
+    looping_task = getContext()->getMessageBrokerSchedulePool().createTask("RabbitMQLoopingTask", [this]{ loopingFunc(); });
     looping_task->deactivate();
 
-    streaming_task = global_context.getMessageBrokerSchedulePool().createTask("RabbitMQStreamingTask", [this]{ streamingToViewsFunc(); });
+    streaming_task = getContext()->getMessageBrokerSchedulePool().createTask("RabbitMQStreamingTask", [this]{ streamingToViewsFunc(); });
     streaming_task->deactivate();
 
-    connection_task = global_context.getMessageBrokerSchedulePool().createTask("RabbitMQConnectionTask", [this]{ connectionFunc(); });
+    connection_task = getContext()->getMessageBrokerSchedulePool().createTask("RabbitMQConnectionTask", [this]{ connectionFunc(); });
     connection_task->deactivate();
 
     if (queue_base.empty())
@@ -188,9 +188,9 @@ String StorageRabbitMQ::getTableBasedName(String name, const StorageID & table_i
 }
 
 
-std::shared_ptr<Context> StorageRabbitMQ::addSettings(const Context & context) const
+std::shared_ptr<Context> StorageRabbitMQ::addSettings(ContextPtr local_context) const
 {
-    auto modified_context = std::make_shared<Context>(context);
+    auto modified_context = Context::createCopy(local_context);
     modified_context->setSetting("input_format_skip_unknown_fields", true);
     modified_context->setSetting("input_format_allow_errors_ratio", 0.);
     modified_context->setSetting("input_format_allow_errors_num", rabbitmq_settings->rabbitmq_skip_broken_messages.value);
@@ -253,7 +253,7 @@ size_t StorageRabbitMQ::getMaxBlockSize() const
  {
      return rabbitmq_settings->rabbitmq_max_block_size.changed
          ? rabbitmq_settings->rabbitmq_max_block_size.value
-         : (global_context.getSettingsRef().max_insert_block_size.value / num_consumers);
+         : (getContext()->getSettingsRef().max_insert_block_size.value / num_consumers);
  }
 
 
@@ -562,7 +562,7 @@ Pipe StorageRabbitMQ::read(
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & /* query_info */,
-        const Context & context,
+        ContextPtr local_context,
         QueryProcessingStage::Enum /* processed_stage */,
         size_t /* max_block_size */,
         unsigned /* num_streams */)
@@ -574,7 +574,7 @@ Pipe StorageRabbitMQ::read(
         return {};
 
     auto sample_block = metadata_snapshot->getSampleBlockForColumns(column_names, getVirtuals(), getStorageID());
-    auto modified_context = addSettings(context);
+    auto modified_context = addSettings(local_context);
     auto block_size = getMaxBlockSize();
 
     if (!event_handler->connectionRunning())
@@ -607,9 +607,9 @@ Pipe StorageRabbitMQ::read(
 }
 
 
-BlockOutputStreamPtr StorageRabbitMQ::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageRabbitMQ::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
-    return std::make_shared<RabbitMQBlockOutputStream>(*this, metadata_snapshot, context);
+    return std::make_shared<RabbitMQBlockOutputStream>(*this, metadata_snapshot, local_context);
 }
 
 
@@ -712,7 +712,7 @@ ConsumerBufferPtr StorageRabbitMQ::createReadBuffer()
 ProducerBufferPtr StorageRabbitMQ::createWriteBuffer()
 {
     return std::make_shared<WriteBufferToRabbitMQProducer>(
-        parsed_address, global_context, login_password, vhost, routing_keys, exchange_name, exchange_type,
+        parsed_address, getContext(), login_password, vhost, routing_keys, exchange_name, exchange_type,
         producer_id.fetch_add(1), persistent, wait_confirm, log,
         row_delimiter ? std::optional<char>{row_delimiter} : std::nullopt, 1, 1024);
 }
@@ -728,7 +728,7 @@ bool StorageRabbitMQ::checkDependencies(const StorageID & table_id)
     // Check the dependencies are ready?
     for (const auto & db_tab : dependencies)
     {
-        auto table = DatabaseCatalog::instance().tryGetTable(db_tab, global_context);
+        auto table = DatabaseCatalog::instance().tryGetTable(db_tab, getContext());
         if (!table)
             return false;
 
@@ -798,7 +798,7 @@ void StorageRabbitMQ::streamingToViewsFunc()
 bool StorageRabbitMQ::streamToViews()
 {
     auto table_id = getStorageID();
-    auto table = DatabaseCatalog::instance().getTable(table_id, global_context);
+    auto table = DatabaseCatalog::instance().getTable(table_id, getContext());
     if (!table)
         throw Exception("Engine table " + table_id.getNameForLogs() + " doesn't exist.", ErrorCodes::LOGICAL_ERROR);
 
@@ -807,7 +807,7 @@ bool StorageRabbitMQ::streamToViews()
     insert->table_id = table_id;
 
     // Only insert into dependent views and expect that input blocks contain virtual columns
-    InterpreterInsertQuery interpreter(insert, *rabbitmq_context, false, true, true);
+    InterpreterInsertQuery interpreter(insert, rabbitmq_context, false, true, true);
     auto block_io = interpreter.execute();
 
     auto metadata_snapshot = getInMemoryMetadataPtr();
@@ -831,7 +831,7 @@ bool StorageRabbitMQ::streamToViews()
 
         limits.speed_limits.max_execution_time = rabbitmq_settings->rabbitmq_flush_interval_ms.changed
                                                   ? rabbitmq_settings->rabbitmq_flush_interval_ms
-                                                  : global_context.getSettingsRef().stream_flush_interval_ms;
+                                                  : getContext()->getSettingsRef().stream_flush_interval_ms;
 
         limits.timeout_overflow_mode = OverflowMode::BREAK;
 
@@ -990,7 +990,7 @@ void registerStorageRabbitMQ(StorageFactory & factory)
 
         #undef CHECK_RABBITMQ_STORAGE_ARGUMENT
 
-        return StorageRabbitMQ::create(args.table_id, args.context, args.columns, std::move(rabbitmq_settings));
+        return StorageRabbitMQ::create(args.table_id, args.getContext(), args.columns, std::move(rabbitmq_settings));
     };
 
     factory.registerStorage("RabbitMQ", creator_fn, StorageFactory::StorageFeatures{ .supports_settings = true, });
diff --git a/src/Storages/RabbitMQ/StorageRabbitMQ.h b/src/Storages/RabbitMQ/StorageRabbitMQ.h
index 9f573ea4a3e..eeda6b9fdca 100644
--- a/src/Storages/RabbitMQ/StorageRabbitMQ.h
+++ b/src/Storages/RabbitMQ/StorageRabbitMQ.h
@@ -19,11 +19,9 @@
 namespace DB
 {
 
-class Context;
-
 using ChannelPtr = std::shared_ptr<AMQP::TcpChannel>;
 
-class StorageRabbitMQ final: public ext::shared_ptr_helper<StorageRabbitMQ>, public IStorage
+class StorageRabbitMQ final: public ext::shared_ptr_helper<StorageRabbitMQ>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageRabbitMQ>;
 
@@ -40,7 +38,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -48,7 +46,7 @@ public:
     BlockOutputStreamPtr write(
         const ASTPtr & query,
         const StorageMetadataPtr & metadata_snapshot,
-        const Context & context) override;
+        ContextPtr context) override;
 
     void pushReadBuffer(ConsumerBufferPtr buf);
     ConsumerBufferPtr popReadBuffer();
@@ -59,7 +57,7 @@ public:
     const String & getFormatName() const { return format_name; }
     NamesAndTypesList getVirtuals() const override;
 
-    const String getExchange() const { return exchange_name; }
+    String getExchange() const { return exchange_name; }
     void unbindExchange();
     bool exchangeRemoved() { return exchange_removed.load(); }
 
@@ -69,13 +67,12 @@ public:
 protected:
     StorageRabbitMQ(
             const StorageID & table_id_,
-            const Context & context_,
+            ContextPtr context_,
             const ColumnsDescription & columns_,
             std::unique_ptr<RabbitMQSettings> rabbitmq_settings_);
 
 private:
-    const Context & global_context;
-    std::shared_ptr<Context> rabbitmq_context;
+    ContextPtr rabbitmq_context;
     std::unique_ptr<RabbitMQSettings> rabbitmq_settings;
 
     const String exchange_name;
@@ -139,7 +136,7 @@ private:
     static AMQP::ExchangeType defineExchangeType(String exchange_type_);
     static String getTableBasedName(String name, const StorageID & table_id);
 
-    std::shared_ptr<Context> addSettings(const Context & context) const;
+    std::shared_ptr<Context> addSettings(ContextPtr context) const;
     size_t getMaxBlockSize() const;
     void deactivateTask(BackgroundSchedulePool::TaskHolder & task, bool wait, bool stop_loop);
 
diff --git a/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.cpp b/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.cpp
index ebee27faf17..b9af60eb66f 100644
--- a/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.cpp
+++ b/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.cpp
@@ -27,7 +27,7 @@ namespace ErrorCodes
 
 WriteBufferToRabbitMQProducer::WriteBufferToRabbitMQProducer(
         std::pair<String, UInt16> & parsed_address_,
-        const Context & global_context,
+        ContextPtr global_context,
         const std::pair<String, String> & login_password_,
         const String & vhost_,
         const Names & routing_keys_,
@@ -72,7 +72,7 @@ WriteBufferToRabbitMQProducer::WriteBufferToRabbitMQProducer(
                 ErrorCodes::CANNOT_CONNECT_RABBITMQ);
     }
 
-    writing_task = global_context.getSchedulePool().createTask("RabbitMQWritingTask", [this]{ writingFunc(); });
+    writing_task = global_context->getSchedulePool().createTask("RabbitMQWritingTask", [this]{ writingFunc(); });
     writing_task->deactivate();
 
     if (exchange_type == AMQP::ExchangeType::headers)
diff --git a/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.h b/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.h
index e88f5e10e74..452cc38d751 100644
--- a/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.h
+++ b/src/Storages/RabbitMQ/WriteBufferToRabbitMQProducer.h
@@ -20,7 +20,7 @@ class WriteBufferToRabbitMQProducer : public WriteBuffer
 public:
     WriteBufferToRabbitMQProducer(
             std::pair<String, UInt16> & parsed_address_,
-            const Context & global_context,
+            ContextPtr global_context,
             const std::pair<String, String> & login_password_,
             const String & vhost_,
             const Names & routing_keys_,
diff --git a/src/Storages/ReadInOrderOptimizer.cpp b/src/Storages/ReadInOrderOptimizer.cpp
index 2b751329208..5f2b5f4db96 100644
--- a/src/Storages/ReadInOrderOptimizer.cpp
+++ b/src/Storages/ReadInOrderOptimizer.cpp
@@ -34,7 +34,7 @@ ReadInOrderOptimizer::ReadInOrderOptimizer(
     forbidden_columns = syntax_result->getArrayJoinSourceNameSet();
 }
 
-InputOrderInfoPtr ReadInOrderOptimizer::getInputOrder(const StorageMetadataPtr & metadata_snapshot, const Context & context) const
+InputOrderInfoPtr ReadInOrderOptimizer::getInputOrder(const StorageMetadataPtr & metadata_snapshot, ContextPtr context) const
 {
     Names sorting_key_columns = metadata_snapshot->getSortingKeyColumns();
     if (!metadata_snapshot->hasSortingKey())
@@ -125,7 +125,7 @@ InputOrderInfoPtr ReadInOrderOptimizer::getInputOrder(const StorageMetadataPtr &
         /// currently we only support alias column without any function wrapper
         /// ie: `order by aliased_column` can have this optimization, but `order by function(aliased_column)` can not.
         /// This suits most cases.
-        if (context.getSettingsRef().optimize_respect_aliases && aliase_columns.contains(required_sort_description[i].column_name))
+        if (context->getSettingsRef().optimize_respect_aliases && aliase_columns.contains(required_sort_description[i].column_name))
         {
             auto column_expr = metadata_snapshot->getColumns().get(required_sort_description[i].column_name).default_desc.expression->clone();
             replaceAliasColumnsInQuery(column_expr, metadata_snapshot->getColumns(), forbidden_columns, context);
diff --git a/src/Storages/ReadInOrderOptimizer.h b/src/Storages/ReadInOrderOptimizer.h
index 3676f4cc88c..0af1121db32 100644
--- a/src/Storages/ReadInOrderOptimizer.h
+++ b/src/Storages/ReadInOrderOptimizer.h
@@ -22,7 +22,7 @@ public:
         const SortDescription & required_sort_description,
         const TreeRewriterResultPtr & syntax_result);
 
-    InputOrderInfoPtr getInputOrder(const StorageMetadataPtr & metadata_snapshot, const Context & context) const;
+    InputOrderInfoPtr getInputOrder(const StorageMetadataPtr & metadata_snapshot, ContextPtr context) const;
 
 private:
     /// Actions for every element of order expression to analyze functions for monotonicity
diff --git a/src/Storages/RocksDB/StorageEmbeddedRocksDB.cpp b/src/Storages/RocksDB/StorageEmbeddedRocksDB.cpp
index 9b0a0c36b45..9173c23ec5a 100644
--- a/src/Storages/RocksDB/StorageEmbeddedRocksDB.cpp
+++ b/src/Storages/RocksDB/StorageEmbeddedRocksDB.cpp
@@ -245,12 +245,12 @@ StorageEmbeddedRocksDB::StorageEmbeddedRocksDB(const StorageID & table_id_,
         const String & relative_data_path_,
         const StorageInMemoryMetadata & metadata_,
         bool attach,
-        Context & context_,
+        ContextPtr context_,
         const String & primary_key_)
     : IStorage(table_id_), primary_key{primary_key_}
 {
     setInMemoryMetadata(metadata_);
-    rocksdb_dir = context_.getPath() + relative_data_path_;
+    rocksdb_dir = context_->getPath() + relative_data_path_;
     if (!attach)
     {
         Poco::File(rocksdb_dir).createDirectories();
@@ -258,7 +258,7 @@ StorageEmbeddedRocksDB::StorageEmbeddedRocksDB(const StorageID & table_id_,
     initDb();
 }
 
-void StorageEmbeddedRocksDB::truncate(const ASTPtr &, const StorageMetadataPtr & , const Context &, TableExclusiveLockHolder &)
+void StorageEmbeddedRocksDB::truncate(const ASTPtr &, const StorageMetadataPtr & , ContextPtr, TableExclusiveLockHolder &)
 {
     rocksdb_ptr->Close();
     Poco::File(rocksdb_dir).remove(true);
@@ -284,7 +284,7 @@ Pipe StorageEmbeddedRocksDB::read(
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t max_block_size,
         unsigned num_streams)
@@ -331,7 +331,7 @@ Pipe StorageEmbeddedRocksDB::read(
 }
 
 BlockOutputStreamPtr StorageEmbeddedRocksDB::write(
-    const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
+    const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/)
 {
     return std::make_shared<EmbeddedRocksDBBlockOutputStream>(*this, metadata_snapshot);
 }
@@ -352,13 +352,13 @@ static StoragePtr create(const StorageFactory::Arguments & args)
     if (!args.storage_def->primary_key)
         throw Exception("StorageEmbeddedRocksDB must require one column in primary key", ErrorCodes::BAD_ARGUMENTS);
 
-    metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->primary_key->ptr(), metadata.columns, args.context);
+    metadata.primary_key = KeyDescription::getKeyFromAST(args.storage_def->primary_key->ptr(), metadata.columns, args.getContext());
     auto primary_key_names = metadata.getColumnsRequiredForPrimaryKey();
     if (primary_key_names.size() != 1)
     {
         throw Exception("StorageEmbeddedRocksDB must require one column in primary key", ErrorCodes::BAD_ARGUMENTS);
     }
-    return StorageEmbeddedRocksDB::create(args.table_id, args.relative_data_path, metadata, args.attach, args.context, primary_key_names[0]);
+    return StorageEmbeddedRocksDB::create(args.table_id, args.relative_data_path, metadata, args.attach, args.getContext(), primary_key_names[0]);
 }
 
 
diff --git a/src/Storages/RocksDB/StorageEmbeddedRocksDB.h b/src/Storages/RocksDB/StorageEmbeddedRocksDB.h
index f1a8c4713eb..64255392c35 100644
--- a/src/Storages/RocksDB/StorageEmbeddedRocksDB.h
+++ b/src/Storages/RocksDB/StorageEmbeddedRocksDB.h
@@ -29,18 +29,18 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
-    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
 
     bool supportsParallelInsert() const override { return true; }
     bool supportsIndexForIn() const override { return true; }
     bool mayBenefitFromIndexForIn(
-        const ASTPtr & node, const Context & /*query_context*/, const StorageMetadataPtr & /*metadata_snapshot*/) const override
+        const ASTPtr & node, ContextPtr /*query_context*/, const StorageMetadataPtr & /*metadata_snapshot*/) const override
     {
         return node->getColumnName() == primary_key;
     }
@@ -53,7 +53,7 @@ protected:
         const String & relative_data_path_,
         const StorageInMemoryMetadata & metadata,
         bool attach,
-        Context & context_,
+        ContextPtr context_,
         const String & primary_key_);
 
 private:
diff --git a/src/Storages/SelectQueryDescription.cpp b/src/Storages/SelectQueryDescription.cpp
index c11e6bd74f8..05747a9a260 100644
--- a/src/Storages/SelectQueryDescription.cpp
+++ b/src/Storages/SelectQueryDescription.cpp
@@ -44,11 +44,11 @@ SelectQueryDescription & SelectQueryDescription::SelectQueryDescription::operato
 namespace
 {
 
-StorageID extractDependentTableFromSelectQuery(ASTSelectQuery & query, const Context & context, bool add_default_db = true)
+StorageID extractDependentTableFromSelectQuery(ASTSelectQuery & query, ContextPtr context, bool add_default_db = true)
 {
     if (add_default_db)
     {
-        AddDefaultDatabaseVisitor visitor(context.getCurrentDatabase(), false, nullptr);
+        AddDefaultDatabaseVisitor visitor(context->getCurrentDatabase(), false, nullptr);
         visitor.visit(query);
     }
 
@@ -114,7 +114,7 @@ static bool isSingleSelect(const ASTPtr & select, ASTPtr & res)
         return isSingleSelect(new_inner_query, res);
 }
 
-SelectQueryDescription SelectQueryDescription::getSelectQueryFromASTForMatView(const ASTPtr & select, const Context & context)
+SelectQueryDescription SelectQueryDescription::getSelectQueryFromASTForMatView(const ASTPtr & select, ContextPtr context)
 {
     ASTPtr new_inner_query;
 
diff --git a/src/Storages/SelectQueryDescription.h b/src/Storages/SelectQueryDescription.h
index ce3ca44c147..28a0a186a07 100644
--- a/src/Storages/SelectQueryDescription.h
+++ b/src/Storages/SelectQueryDescription.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <Interpreters/Context_fwd.h>
 #include <Interpreters/StorageID.h>
 
 namespace DB
@@ -17,7 +18,7 @@ struct SelectQueryDescription
 
     /// Parse description from select query for materialized view. Also
     /// validates query.
-    static SelectQueryDescription getSelectQueryFromASTForMatView(const ASTPtr & select, const Context & context);
+    static SelectQueryDescription getSelectQueryFromASTForMatView(const ASTPtr & select, ContextPtr context);
 
     SelectQueryDescription() = default;
     SelectQueryDescription(const SelectQueryDescription & other);
diff --git a/src/Storages/StorageBuffer.cpp b/src/Storages/StorageBuffer.cpp
index 1c016a6bcba..5c4b4e7d1d8 100644
--- a/src/Storages/StorageBuffer.cpp
+++ b/src/Storages/StorageBuffer.cpp
@@ -99,21 +99,21 @@ StorageBuffer::StorageBuffer(
     const StorageID & table_id_,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    const Context & context_,
+    ContextPtr context_,
     size_t num_shards_,
     const Thresholds & min_thresholds_,
     const Thresholds & max_thresholds_,
     const StorageID & destination_id_,
     bool allow_materialized_)
     : IStorage(table_id_)
-    , buffer_context(context_.getBufferContext())
+    , WithContext(context_->getBufferContext())
     , num_shards(num_shards_), buffers(num_shards_)
     , min_thresholds(min_thresholds_)
     , max_thresholds(max_thresholds_)
     , destination_id(destination_id_)
     , allow_materialized(allow_materialized_)
     , log(&Poco::Logger::get("StorageBuffer (" + table_id_.getFullTableName() + ")"))
-    , bg_pool(buffer_context.getBufferFlushSchedulePool())
+    , bg_pool(getContext()->getBufferFlushSchedulePool())
 {
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -173,16 +173,16 @@ private:
 };
 
 
-QueryProcessingStage::Enum StorageBuffer::getQueryProcessingStage(const Context & context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
+QueryProcessingStage::Enum StorageBuffer::getQueryProcessingStage(ContextPtr local_context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
 {
     if (destination_id)
     {
-        auto destination = DatabaseCatalog::instance().getTable(destination_id, context);
+        auto destination = DatabaseCatalog::instance().getTable(destination_id, local_context);
 
         if (destination.get() == this)
             throw Exception("Destination table is myself. Read will cause infinite loop.", ErrorCodes::INFINITE_LOOP);
 
-        return destination->getQueryProcessingStage(context, to_stage, query_info);
+        return destination->getQueryProcessingStage(local_context, to_stage, query_info);
     }
 
     return QueryProcessingStage::FetchColumns;
@@ -193,16 +193,16 @@ Pipe StorageBuffer::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     QueryPlan plan;
-    read(plan, column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    read(plan, column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
     return plan.convertToPipe(
-        QueryPlanOptimizationSettings::fromContext(context),
-        BuildQueryPipelineSettings::fromContext(context));
+        QueryPlanOptimizationSettings::fromContext(local_context),
+        BuildQueryPipelineSettings::fromContext(local_context));
 }
 
 void StorageBuffer::read(
@@ -210,19 +210,19 @@ void StorageBuffer::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned num_streams)
 {
     if (destination_id)
     {
-        auto destination = DatabaseCatalog::instance().getTable(destination_id, context);
+        auto destination = DatabaseCatalog::instance().getTable(destination_id, local_context);
 
         if (destination.get() == this)
             throw Exception("Destination table is myself. Read will cause infinite loop.", ErrorCodes::INFINITE_LOOP);
 
-        auto destination_lock = destination->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+        auto destination_lock = destination->lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
 
         auto destination_metadata_snapshot = destination->getInMemoryMetadataPtr();
 
@@ -237,12 +237,12 @@ void StorageBuffer::read(
         if (dst_has_same_structure)
         {
             if (query_info.order_optimizer)
-                query_info.input_order_info = query_info.order_optimizer->getInputOrder(destination_metadata_snapshot, context);
+                query_info.input_order_info = query_info.order_optimizer->getInputOrder(destination_metadata_snapshot, local_context);
 
             /// The destination table has the same structure of the requested columns and we can simply read blocks from there.
             destination->read(
                 query_plan, column_names, destination_metadata_snapshot, query_info,
-                context, processed_stage, max_block_size, num_streams);
+                local_context, processed_stage, max_block_size, num_streams);
         }
         else
         {
@@ -277,7 +277,7 @@ void StorageBuffer::read(
             {
                 destination->read(
                         query_plan, columns_intersection, destination_metadata_snapshot, query_info,
-                        context, processed_stage, max_block_size, num_streams);
+                        local_context, processed_stage, max_block_size, num_streams);
 
                 if (query_plan.isInitialized())
                 {
@@ -286,7 +286,7 @@ void StorageBuffer::read(
                             query_plan.getCurrentDataStream().header,
                             header_after_adding_defaults.getNamesAndTypesList(),
                             metadata_snapshot->getColumns(),
-                            context);
+                            local_context);
 
                     auto adding_missed = std::make_unique<ExpressionStep>(
                             query_plan.getCurrentDataStream(),
@@ -349,7 +349,7 @@ void StorageBuffer::read(
     if (processed_stage > QueryProcessingStage::FetchColumns)
     {
         auto interpreter = InterpreterSelectQuery(
-                query_info.query, context, std::move(pipe_from_buffers),
+                query_info.query, local_context, std::move(pipe_from_buffers),
                 SelectQueryOptions(processed_stage));
         interpreter.buildQueryPlan(buffers_plan);
     }
@@ -527,7 +527,7 @@ public:
         StoragePtr destination;
         if (storage.destination_id)
         {
-            destination = DatabaseCatalog::instance().tryGetTable(storage.destination_id, storage.buffer_context);
+            destination = DatabaseCatalog::instance().tryGetTable(storage.destination_id, storage.getContext());
             if (destination.get() == &storage)
                 throw Exception("Destination table is myself. Write will cause infinite loop.", ErrorCodes::INFINITE_LOOP);
         }
@@ -620,14 +620,14 @@ private:
 };
 
 
-BlockOutputStreamPtr StorageBuffer::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
+BlockOutputStreamPtr StorageBuffer::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/)
 {
     return std::make_shared<BufferBlockOutputStream>(*this, metadata_snapshot);
 }
 
 
 bool StorageBuffer::mayBenefitFromIndexForIn(
-    const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & /*metadata_snapshot*/) const
+    const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & /*metadata_snapshot*/) const
 {
     if (!destination_id)
         return false;
@@ -643,7 +643,7 @@ bool StorageBuffer::mayBenefitFromIndexForIn(
 
 void StorageBuffer::startup()
 {
-    if (buffer_context.getSettingsRef().readonly)
+    if (getContext()->getSettingsRef().readonly)
     {
         LOG_WARNING(log, "Storage {} is run with readonly settings, it will not be able to insert data. Set appropriate buffer_profile to fix this.", getName());
     }
@@ -662,7 +662,7 @@ void StorageBuffer::shutdown()
 
     try
     {
-        optimize(nullptr /*query*/, getInMemoryMetadataPtr(), {} /*partition*/, false /*final*/, false /*deduplicate*/, {}, buffer_context);
+        optimize(nullptr /*query*/, getInMemoryMetadataPtr(), {} /*partition*/, false /*final*/, false /*deduplicate*/, {}, getContext());
     }
     catch (...)
     {
@@ -688,7 +688,7 @@ bool StorageBuffer::optimize(
     bool final,
     bool deduplicate,
     const Names & /* deduplicate_by_columns */,
-    const Context & /*context*/)
+    ContextPtr /*context*/)
 {
     if (partition)
         throw Exception("Partition cannot be specified when optimizing table of type Buffer", ErrorCodes::NOT_IMPLEMENTED);
@@ -707,7 +707,7 @@ bool StorageBuffer::supportsPrewhere() const
 {
     if (!destination_id)
         return false;
-    auto dest = DatabaseCatalog::instance().tryGetTable(destination_id, buffer_context);
+    auto dest = DatabaseCatalog::instance().tryGetTable(destination_id, getContext());
     if (dest && dest.get() != this)
         return dest->supportsPrewhere();
     return false;
@@ -818,7 +818,7 @@ void StorageBuffer::flushBuffer(Buffer & buffer, bool check_thresholds, bool loc
     Stopwatch watch;
     try
     {
-        writeBlockToDestination(block_to_write, DatabaseCatalog::instance().tryGetTable(destination_id, buffer_context));
+        writeBlockToDestination(block_to_write, DatabaseCatalog::instance().tryGetTable(destination_id, getContext()));
         if (reset_block_structure)
             buffer.data.clear();
     }
@@ -900,8 +900,8 @@ void StorageBuffer::writeBlockToDestination(const Block & block, StoragePtr tabl
     for (const auto & column : block_to_write)
         list_of_columns->children.push_back(std::make_shared<ASTIdentifier>(column.name));
 
-    auto insert_context = Context(buffer_context);
-    insert_context.makeQueryContext();
+    auto insert_context = Context::createCopy(getContext());
+    insert_context->makeQueryContext();
 
     InterpreterInsertQuery interpreter{insert, insert_context, allow_materialized};
 
@@ -962,9 +962,9 @@ void StorageBuffer::reschedule()
     flush_handle->scheduleAfter(std::min(min, max) * 1000);
 }
 
-void StorageBuffer::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void StorageBuffer::checkAlterIsPossible(const AlterCommands & commands, ContextPtr local_context) const
 {
-    auto name_deps = getDependentViewsByColumn(context);
+    auto name_deps = getDependentViewsByColumn(local_context);
     for (const auto & command : commands)
     {
         if (command.type != AlterCommand::Type::ADD_COLUMN && command.type != AlterCommand::Type::MODIFY_COLUMN
@@ -989,7 +989,7 @@ void StorageBuffer::checkAlterIsPossible(const AlterCommands & commands, const C
 std::optional<UInt64> StorageBuffer::totalRows(const Settings & settings) const
 {
     std::optional<UInt64> underlying_rows;
-    auto underlying = DatabaseCatalog::instance().tryGetTable(destination_id, buffer_context);
+    auto underlying = DatabaseCatalog::instance().tryGetTable(destination_id, getContext());
 
     if (underlying)
         underlying_rows = underlying->totalRows(settings);
@@ -1016,20 +1016,20 @@ std::optional<UInt64> StorageBuffer::totalBytes(const Settings & /*settings*/) c
     return bytes;
 }
 
-void StorageBuffer::alter(const AlterCommands & params, const Context & context, TableLockHolder &)
+void StorageBuffer::alter(const AlterCommands & params, ContextPtr local_context, TableLockHolder &)
 {
     auto table_id = getStorageID();
-    checkAlterIsPossible(params, context);
+    checkAlterIsPossible(params, local_context);
     auto metadata_snapshot = getInMemoryMetadataPtr();
 
     /// Flush all buffers to storages, so that no non-empty blocks of the old
     /// structure remain. Structure of empty blocks will be updated during first
     /// insert.
-    optimize({} /*query*/, metadata_snapshot, {} /*partition_id*/, false /*final*/, false /*deduplicate*/, {}, context);
+    optimize({} /*query*/, metadata_snapshot, {} /*partition_id*/, false /*final*/, false /*deduplicate*/, {}, local_context);
 
     StorageInMemoryMetadata new_metadata = *metadata_snapshot;
-    params.apply(new_metadata, context);
-    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
+    params.apply(new_metadata, local_context);
+    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
     setInMemoryMetadata(new_metadata);
 }
 
@@ -1053,8 +1053,8 @@ void registerStorageBuffer(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         // Table and database name arguments accept expressions, evaluate them.
-        engine_args[0] = evaluateConstantExpressionForDatabaseName(engine_args[0], args.local_context);
-        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
+        engine_args[0] = evaluateConstantExpressionForDatabaseName(engine_args[0], args.getLocalContext());
+        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.getLocalContext());
 
         // After we evaluated all expressions, check that all arguments are
         // literals.
@@ -1084,7 +1084,7 @@ void registerStorageBuffer(StorageFactory & factory)
         StorageID destination_id = StorageID::createEmpty();
         if (!destination_table.empty())
         {
-            destination_id.database_name = args.context.resolveDatabase(destination_database);
+            destination_id.database_name = args.getContext()->resolveDatabase(destination_database);
             destination_id.table_name = destination_table;
         }
 
@@ -1092,12 +1092,12 @@ void registerStorageBuffer(StorageFactory & factory)
             args.table_id,
             args.columns,
             args.constraints,
-            args.context,
+            args.getContext(),
             num_buckets,
             StorageBuffer::Thresholds{min_time, min_rows, min_bytes},
             StorageBuffer::Thresholds{max_time, max_rows, max_bytes},
             destination_id,
-            static_cast<bool>(args.local_context.getSettingsRef().insert_allow_materialized_columns));
+            static_cast<bool>(args.getLocalContext()->getSettingsRef().insert_allow_materialized_columns));
     },
     {
         .supports_parallel_insert = true,
diff --git a/src/Storages/StorageBuffer.h b/src/Storages/StorageBuffer.h
index 5d72e32544c..b29bbf179f4 100644
--- a/src/Storages/StorageBuffer.h
+++ b/src/Storages/StorageBuffer.h
@@ -1,15 +1,17 @@
 #pragma once
 
-#include <mutex>
-#include <atomic>
-#include <thread>
-#include <ext/shared_ptr_helper.h>
-#include <Core/NamesAndTypes.h>
 #include <Core/BackgroundSchedulePool.h>
-#include <Storages/IStorage.h>
+#include <Core/NamesAndTypes.h>
 #include <DataStreams/IBlockOutputStream.h>
+#include <Storages/IStorage.h>
+#include <ext/shared_ptr_helper.h>
+
 #include <Poco/Event.h>
 
+#include <atomic>
+#include <mutex>
+#include <thread>
+
 
 namespace Poco { class Logger; }
 
@@ -36,7 +38,7 @@ namespace DB
   * When you destroy a Buffer table, all remaining data is flushed to the subordinate table.
   * The data in the buffer is not replicated, not logged to disk, not indexed. With a rough restart of the server, the data is lost.
   */
-class StorageBuffer final : public ext::shared_ptr_helper<StorageBuffer>, public IStorage
+class StorageBuffer final : public ext::shared_ptr_helper<StorageBuffer>, public IStorage, WithContext
 {
 friend struct ext::shared_ptr_helper<StorageBuffer>;
 friend class BufferSource;
@@ -53,13 +55,13 @@ public:
 
     std::string getName() const override { return "Buffer"; }
 
-    QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
+    QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
 
     Pipe read(
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -69,7 +71,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -78,7 +80,7 @@ public:
 
     bool supportsSubcolumns() const override { return true; }
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     void startup() override;
     /// Flush all buffers into the subordinate table and stop background thread.
@@ -90,19 +92,19 @@ public:
         bool final,
         bool deduplicate,
         const Names & deduplicate_by_columns,
-        const Context & context) override;
+        ContextPtr context) override;
 
     bool supportsSampling() const override { return true; }
     bool supportsPrewhere() const override;
     bool supportsFinal() const override { return true; }
     bool supportsIndexForIn() const override { return true; }
 
-    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & metadata_snapshot) const override;
+    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & metadata_snapshot) const override;
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
     /// The structure of the subordinate table is not checked and does not change.
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     std::optional<UInt64> totalRows(const Settings & settings) const override;
     std::optional<UInt64> totalBytes(const Settings & settings) const override;
@@ -112,8 +114,6 @@ public:
 
 
 private:
-    const Context & buffer_context;
-
     struct Buffer
     {
         time_t first_write_time = 0;
@@ -173,7 +173,7 @@ protected:
         const StorageID & table_id_,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        const Context & context_,
+        ContextPtr context_,
         size_t num_shards_,
         const Thresholds & min_thresholds_,
         const Thresholds & max_thresholds_,
diff --git a/src/Storages/StorageDictionary.cpp b/src/Storages/StorageDictionary.cpp
index 36241cd5582..e2cab153092 100644
--- a/src/Storages/StorageDictionary.cpp
+++ b/src/Storages/StorageDictionary.cpp
@@ -128,12 +128,12 @@ Pipe StorageDictionary::read(
     const Names & column_names,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t max_block_size,
     const unsigned /*threads*/)
 {
-    auto dictionary = context.getExternalDictionariesLoader().getDictionary(dictionary_name, context);
+    auto dictionary = context->getExternalDictionariesLoader().getDictionary(dictionary_name, context);
     auto stream = dictionary->getBlockInputStream(column_names, max_block_size);
     /// TODO: update dictionary interface for processors.
     return Pipe(std::make_shared<SourceFromInputStream>(stream));
@@ -148,13 +148,12 @@ void registerStorageDictionary(StorageFactory & factory)
             throw Exception("Storage Dictionary requires single parameter: name of dictionary",
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
-        args.engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(args.engine_args[0], args.local_context);
+        args.engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(args.engine_args[0], args.getLocalContext());
         String dictionary_name = args.engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
 
         if (!args.attach)
         {
-            const auto & context = args.context;
-            const auto & dictionary = context.getExternalDictionariesLoader().getDictionary(dictionary_name, context);
+            const auto & dictionary = args.getContext()->getExternalDictionariesLoader().getDictionary(dictionary_name, args.getContext());
             const DictionaryStructure & dictionary_structure = dictionary->getStructure();
             checkNamesAndTypesCompatibleWithDictionary(dictionary_name, args.columns, dictionary_structure);
         }
diff --git a/src/Storages/StorageDictionary.h b/src/Storages/StorageDictionary.h
index 563def8672b..9e8564d4349 100644
--- a/src/Storages/StorageDictionary.h
+++ b/src/Storages/StorageDictionary.h
@@ -23,7 +23,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned threads) override;
diff --git a/src/Storages/StorageDistributed.cpp b/src/Storages/StorageDistributed.cpp
index f2c5559e4b2..52c8c4f79e0 100644
--- a/src/Storages/StorageDistributed.cpp
+++ b/src/Storages/StorageDistributed.cpp
@@ -221,7 +221,7 @@ std::string makeFormattedListOfShards(const ClusterPtr & cluster)
     return buf.str();
 }
 
-ExpressionActionsPtr buildShardingKeyExpression(const ASTPtr & sharding_key, const Context & context, const NamesAndTypesList & columns, bool project)
+ExpressionActionsPtr buildShardingKeyExpression(const ASTPtr & sharding_key, ContextPtr context, const NamesAndTypesList & columns, bool project)
 {
     ASTPtr query = sharding_key;
     auto syntax_result = TreeRewriter(context).analyze(query, columns);
@@ -269,7 +269,7 @@ public:
 
 void replaceConstantExpressions(
     ASTPtr & node,
-    const Context & context,
+    ContextPtr context,
     const NamesAndTypesList & columns,
     ConstStoragePtr storage,
     const StorageMetadataPtr & metadata_snapshot)
@@ -389,7 +389,7 @@ StorageDistributed::StorageDistributed(
     const String & remote_database_,
     const String & remote_table_,
     const String & cluster_name_,
-    const Context & context_,
+    ContextPtr context_,
     const ASTPtr & sharding_key_,
     const String & storage_policy_name_,
     const String & relative_data_path_,
@@ -397,12 +397,12 @@ StorageDistributed::StorageDistributed(
     bool attach_,
     ClusterPtr owned_cluster_)
     : IStorage(id_)
+    , WithContext(context_->getGlobalContext())
     , remote_database(remote_database_)
     , remote_table(remote_table_)
-    , global_context(context_.getGlobalContext())
     , log(&Poco::Logger::get("StorageDistributed (" + id_.table_name + ")"))
     , owned_cluster(std::move(owned_cluster_))
-    , cluster_name(global_context.getMacros()->expand(cluster_name_))
+    , cluster_name(getContext()->getMacros()->expand(cluster_name_))
     , has_sharding_key(sharding_key_)
     , relative_data_path(relative_data_path_)
     , distributed_settings(distributed_settings_)
@@ -415,14 +415,14 @@ StorageDistributed::StorageDistributed(
 
     if (sharding_key_)
     {
-        sharding_key_expr = buildShardingKeyExpression(sharding_key_, global_context, storage_metadata.getColumns().getAllPhysical(), false);
+        sharding_key_expr = buildShardingKeyExpression(sharding_key_, getContext(), storage_metadata.getColumns().getAllPhysical(), false);
         sharding_key_column_name = sharding_key_->getColumnName();
         sharding_key_is_deterministic = isExpressionActionsDeterministics(sharding_key_expr);
     }
 
     if (!relative_data_path.empty())
     {
-        storage_policy = global_context.getStoragePolicy(storage_policy_name_);
+        storage_policy = getContext()->getStoragePolicy(storage_policy_name_);
         data_volume = storage_policy->getVolume(0);
         if (storage_policy->getVolumes().size() > 1)
             LOG_WARNING(log, "Storage policy for Distributed table has multiple volumes. "
@@ -432,7 +432,7 @@ StorageDistributed::StorageDistributed(
     /// Sanity check. Skip check if the table is already created to allow the server to start.
     if (!attach_ && !cluster_name.empty())
     {
-        size_t num_local_shards = global_context.getCluster(cluster_name)->getLocalShardCount();
+        size_t num_local_shards = getContext()->getCluster(cluster_name)->getLocalShardCount();
         if (num_local_shards && remote_database == id_.database_name && remote_table == id_.table_name)
             throw Exception("Distributed table " + id_.table_name + " looks at itself", ErrorCodes::INFINITE_LOOP);
     }
@@ -445,7 +445,7 @@ StorageDistributed::StorageDistributed(
     const ConstraintsDescription & constraints_,
     ASTPtr remote_table_function_ptr_,
     const String & cluster_name_,
-    const Context & context_,
+    ContextPtr context_,
     const ASTPtr & sharding_key_,
     const String & storage_policy_name_,
     const String & relative_data_path_,
@@ -458,9 +458,9 @@ StorageDistributed::StorageDistributed(
 }
 
 QueryProcessingStage::Enum StorageDistributed::getQueryProcessingStage(
-    const Context & context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
+    ContextPtr local_context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
     auto metadata_snapshot = getInMemoryMetadataPtr();
 
     ClusterPtr cluster = getCluster();
@@ -470,16 +470,23 @@ QueryProcessingStage::Enum StorageDistributed::getQueryProcessingStage(
     /// (Anyway it will be calculated in the read())
     if (settings.optimize_skip_unused_shards)
     {
-        ClusterPtr optimized_cluster = getOptimizedCluster(context, metadata_snapshot, query_info.query);
+        ClusterPtr optimized_cluster = getOptimizedCluster(local_context, metadata_snapshot, query_info.query);
         if (optimized_cluster)
         {
-            LOG_DEBUG(log, "Skipping irrelevant shards - the query will be sent to the following shards of the cluster (shard numbers): {}", makeFormattedListOfShards(optimized_cluster));
+            LOG_DEBUG(
+                log,
+                "Skipping irrelevant shards - the query will be sent to the following shards of the cluster (shard numbers): {}",
+                makeFormattedListOfShards(optimized_cluster));
             cluster = optimized_cluster;
             query_info.cluster = cluster;
         }
         else
         {
-            LOG_DEBUG(log, "Unable to figure out irrelevant shards from WHERE/PREWHERE clauses - the query will be sent to all shards of the cluster{}", has_sharding_key ? "" : " (no sharding key)");
+            LOG_DEBUG(
+                log,
+                "Unable to figure out irrelevant shards from WHERE/PREWHERE clauses - the query will be sent to all shards of the "
+                "cluster{}",
+                has_sharding_key ? "" : " (no sharding key)");
         }
     }
 
@@ -522,16 +529,16 @@ Pipe StorageDistributed::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     QueryPlan plan;
-    read(plan, column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    read(plan, column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
     return plan.convertToPipe(
-        QueryPlanOptimizationSettings::fromContext(context),
-        BuildQueryPipelineSettings::fromContext(context));
+        QueryPlanOptimizationSettings::fromContext(local_context),
+        BuildQueryPipelineSettings::fromContext(local_context));
 }
 
 void StorageDistributed::read(
@@ -539,7 +546,7 @@ void StorageDistributed::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
@@ -548,7 +555,7 @@ void StorageDistributed::read(
         query_info.query, remote_database, remote_table, remote_table_function_ptr);
 
     Block header =
-        InterpreterSelectQuery(query_info.query, context, SelectQueryOptions(processed_stage).analyze()).getSampleBlock();
+        InterpreterSelectQuery(query_info.query, local_context, SelectQueryOptions(processed_stage).analyze()).getSampleBlock();
 
     /// Return directly (with correct header) if no shard to query.
     if (query_info.cluster->getShardsInfo().empty())
@@ -561,7 +568,7 @@ void StorageDistributed::read(
         return;
     }
 
-    const Scalars & scalars = context.hasQueryContext() ? context.getQueryContext().getScalars() : Scalars{};
+    const Scalars & scalars = local_context->hasQueryContext() ? local_context->getQueryContext()->getScalars() : Scalars{};
 
     bool has_virtual_shard_num_column = std::find(column_names.begin(), column_names.end(), "_shard_num") != column_names.end();
     if (has_virtual_shard_num_column && !isVirtualColumn("_shard_num", metadata_snapshot))
@@ -569,12 +576,17 @@ void StorageDistributed::read(
 
     ClusterProxy::SelectStreamFactory select_stream_factory = remote_table_function_ptr
         ? ClusterProxy::SelectStreamFactory(
-            header, processed_stage, remote_table_function_ptr, scalars, has_virtual_shard_num_column, context.getExternalTables())
+            header, processed_stage, remote_table_function_ptr, scalars, has_virtual_shard_num_column, local_context->getExternalTables())
         : ClusterProxy::SelectStreamFactory(
-            header, processed_stage, StorageID{remote_database, remote_table}, scalars, has_virtual_shard_num_column, context.getExternalTables());
+            header,
+            processed_stage,
+            StorageID{remote_database, remote_table},
+            scalars,
+            has_virtual_shard_num_column,
+            local_context->getExternalTables());
 
     ClusterProxy::executeQuery(query_plan, select_stream_factory, log,
-        modified_query_ast, context, query_info);
+        modified_query_ast, local_context, query_info);
 
     /// This is a bug, it is possible only when there is no shards to query, and this is handled earlier.
     if (!query_plan.isInitialized())
@@ -582,10 +594,10 @@ void StorageDistributed::read(
 }
 
 
-BlockOutputStreamPtr StorageDistributed::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageDistributed::write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
     auto cluster = getCluster();
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
 
     /// Ban an attempt to make async insert into the table belonging to DatabaseMemory
     if (!storage_policy && !owned_cluster && !settings.insert_distributed_sync && !settings.insert_shard_id)
@@ -615,16 +627,16 @@ BlockOutputStreamPtr StorageDistributed::write(const ASTPtr &, const StorageMeta
 
     /// DistributedBlockOutputStream will not own cluster, but will own ConnectionPools of the cluster
     return std::make_shared<DistributedBlockOutputStream>(
-        context, *this, metadata_snapshot,
+        local_context, *this, metadata_snapshot,
         createInsertToRemoteTableQuery(
             remote_database, remote_table, metadata_snapshot->getSampleBlockNonMaterialized()),
         cluster, insert_sync, timeout);
 }
 
 
-QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & query, const Context & context)
+QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & query, ContextPtr local_context)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = local_context->getSettingsRef();
     std::shared_ptr<StorageDistributed> storage_src;
     auto & select = query.select->as<ASTSelectWithUnionQuery &>();
     auto new_query = std::dynamic_pointer_cast<ASTInsertQuery>(query.clone());
@@ -632,7 +644,7 @@ QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & que
     {
         if (auto * select_query = select.list_of_selects->children.at(0)->as<ASTSelectQuery>())
         {
-            JoinedTables joined_tables(Context(context), *select_query);
+            JoinedTables joined_tables(Context::createCopy(local_context), *select_query);
 
             if (joined_tables.tablesCount() == 1)
             {
@@ -674,7 +686,7 @@ QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & que
         const auto & shard_info = shards_info[shard_index];
         if (shard_info.isLocal())
         {
-            InterpreterInsertQuery interpreter(new_query, context);
+            InterpreterInsertQuery interpreter(new_query, local_context);
             pipelines.emplace_back(std::make_unique<QueryPipeline>(interpreter.execute().pipeline));
         }
         else
@@ -686,7 +698,7 @@ QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & que
                     "Expected exactly one connection for shard " + toString(shard_info.shard_num), ErrorCodes::LOGICAL_ERROR);
 
             ///  INSERT SELECT query returns empty block
-            auto in_stream = std::make_shared<RemoteBlockInputStream>(std::move(connections), new_query_str, Block{}, context);
+            auto in_stream = std::make_shared<RemoteBlockInputStream>(std::move(connections), new_query_str, Block{}, local_context);
             pipelines.emplace_back(std::make_unique<QueryPipeline>());
             pipelines.back()->init(Pipe(std::make_shared<SourceFromInputStream>(std::move(in_stream))));
             pipelines.back()->setSinks([](const Block & header, QueryPipeline::StreamType) -> ProcessorPtr
@@ -696,14 +708,13 @@ QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & que
         }
     }
 
-    return std::make_unique<QueryPipeline>(
-        QueryPipeline::unitePipelines(std::move(pipelines)));
+    return std::make_unique<QueryPipeline>(QueryPipeline::unitePipelines(std::move(pipelines)));
 }
 
 
-void StorageDistributed::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void StorageDistributed::checkAlterIsPossible(const AlterCommands & commands, ContextPtr local_context) const
 {
-    auto name_deps = getDependentViewsByColumn(context);
+    auto name_deps = getDependentViewsByColumn(local_context);
     for (const auto & command : commands)
     {
         if (command.type != AlterCommand::Type::ADD_COLUMN
@@ -728,14 +739,14 @@ void StorageDistributed::checkAlterIsPossible(const AlterCommands & commands, co
     }
 }
 
-void StorageDistributed::alter(const AlterCommands & params, const Context & context, TableLockHolder &)
+void StorageDistributed::alter(const AlterCommands & params, ContextPtr local_context, TableLockHolder &)
 {
     auto table_id = getStorageID();
 
-    checkAlterIsPossible(params, context);
+    checkAlterIsPossible(params, local_context);
     StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
-    params.apply(new_metadata, context);
-    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
+    params.apply(new_metadata, local_context);
+    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
     setInMemoryMetadata(new_metadata);
 }
 
@@ -809,7 +820,7 @@ Strings StorageDistributed::getDataPaths() const
     return paths;
 }
 
-void StorageDistributed::truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &)
+void StorageDistributed::truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &)
 {
     std::lock_guard lock(cluster_nodes_mutex);
 
@@ -876,7 +887,7 @@ StorageDistributedDirectoryMonitor& StorageDistributed::requireDirectoryMonitor(
             *this, disk, relative_data_path + name,
             node_data.connection_pool,
             monitors_blocker,
-            global_context.getDistributedSchedulePool());
+            getContext()->getDistributedSchedulePool());
     }
     return *node_data.directory_monitor;
 }
@@ -906,19 +917,20 @@ size_t StorageDistributed::getShardCount() const
 
 ClusterPtr StorageDistributed::getCluster() const
 {
-    return owned_cluster ? owned_cluster : global_context.getCluster(cluster_name);
+    return owned_cluster ? owned_cluster : getContext()->getCluster(cluster_name);
 }
 
-ClusterPtr StorageDistributed::getOptimizedCluster(const Context & context, const StorageMetadataPtr & metadata_snapshot, const ASTPtr & query_ptr) const
+ClusterPtr StorageDistributed::getOptimizedCluster(
+    ContextPtr local_context, const StorageMetadataPtr & metadata_snapshot, const ASTPtr & query_ptr) const
 {
     ClusterPtr cluster = getCluster();
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = local_context->getSettingsRef();
 
     bool sharding_key_is_usable = settings.allow_nondeterministic_optimize_skip_unused_shards || sharding_key_is_deterministic;
 
     if (has_sharding_key && sharding_key_is_usable)
     {
-        ClusterPtr optimized = skipUnusedShards(cluster, query_ptr, metadata_snapshot, context);
+        ClusterPtr optimized = skipUnusedShards(cluster, query_ptr, metadata_snapshot, local_context);
         if (optimized)
             return optimized;
     }
@@ -975,7 +987,7 @@ ClusterPtr StorageDistributed::skipUnusedShards(
     ClusterPtr cluster,
     const ASTPtr & query_ptr,
     const StorageMetadataPtr & metadata_snapshot,
-    const Context & context) const
+    ContextPtr local_context) const
 {
     const auto & select = query_ptr->as<ASTSelectQuery &>();
 
@@ -994,9 +1006,9 @@ ClusterPtr StorageDistributed::skipUnusedShards(
         condition_ast = select.prewhere() ? select.prewhere()->clone() : select.where()->clone();
     }
 
-    replaceConstantExpressions(condition_ast, context, metadata_snapshot->getColumns().getAll(), shared_from_this(), metadata_snapshot);
+    replaceConstantExpressions(condition_ast, local_context, metadata_snapshot->getColumns().getAll(), shared_from_this(), metadata_snapshot);
 
-    size_t limit = context.getSettingsRef().optimize_skip_unused_shards_limit;
+    size_t limit = local_context->getSettingsRef().optimize_skip_unused_shards_limit;
     if (!limit || limit > SSIZE_MAX)
     {
         throw Exception("optimize_skip_unused_shards_limit out of range (0, {}]", ErrorCodes::ARGUMENT_OUT_OF_BOUND, SSIZE_MAX);
@@ -1010,7 +1022,7 @@ ClusterPtr StorageDistributed::skipUnusedShards(
         LOG_TRACE(log,
             "Number of values for sharding key exceeds optimize_skip_unused_shards_limit={}, "
             "try to increase it, but note that this may increase query processing time.",
-            context.getSettingsRef().optimize_skip_unused_shards_limit);
+            local_context->getSettingsRef().optimize_skip_unused_shards_limit);
         return nullptr;
     }
 
@@ -1043,10 +1055,10 @@ ActionLock StorageDistributed::getActionLock(StorageActionBlockType type)
     return {};
 }
 
-void StorageDistributed::flushClusterNodesAllData(const Context & context)
+void StorageDistributed::flushClusterNodesAllData(ContextPtr local_context)
 {
     /// Sync SYSTEM FLUSH DISTRIBUTED with TRUNCATE
-    auto table_lock = lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto table_lock = lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
 
     std::vector<std::shared_ptr<StorageDistributedDirectoryMonitor>> directory_monitors;
 
@@ -1121,7 +1133,7 @@ void StorageDistributed::delayInsertOrThrowIfNeeded() const
         !distributed_settings.bytes_to_delay_insert)
         return;
 
-    UInt64 total_bytes = *totalBytes(global_context.getSettingsRef());
+    UInt64 total_bytes = *totalBytes(getContext()->getSettingsRef());
 
     if (distributed_settings.bytes_to_throw_insert && total_bytes > distributed_settings.bytes_to_throw_insert)
     {
@@ -1142,12 +1154,12 @@ void StorageDistributed::delayInsertOrThrowIfNeeded() const
         do {
             delayed_ms += step_ms;
             std::this_thread::sleep_for(std::chrono::milliseconds(step_ms));
-        } while (*totalBytes(global_context.getSettingsRef()) > distributed_settings.bytes_to_delay_insert && delayed_ms < distributed_settings.max_delay_to_insert*1000);
+        } while (*totalBytes(getContext()->getSettingsRef()) > distributed_settings.bytes_to_delay_insert && delayed_ms < distributed_settings.max_delay_to_insert*1000);
 
         ProfileEvents::increment(ProfileEvents::DistributedDelayedInserts);
         ProfileEvents::increment(ProfileEvents::DistributedDelayedInsertsMilliseconds, delayed_ms);
 
-        UInt64 new_total_bytes = *totalBytes(global_context.getSettingsRef());
+        UInt64 new_total_bytes = *totalBytes(getContext()->getSettingsRef());
         LOG_INFO(log, "Too many bytes pending for async INSERT: was {}, now {}, INSERT was delayed to {} ms",
             formatReadableSizeWithBinarySuffix(total_bytes),
             formatReadableSizeWithBinarySuffix(new_total_bytes),
@@ -1197,8 +1209,8 @@ void registerStorageDistributed(StorageFactory & factory)
 
         String cluster_name = getClusterNameAndMakeLiteral(engine_args[0]);
 
-        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
-        engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.local_context);
+        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.getLocalContext());
+        engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.getLocalContext());
 
         String remote_database = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
         String remote_table = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
@@ -1209,7 +1221,7 @@ void registerStorageDistributed(StorageFactory & factory)
         /// Check that sharding_key exists in the table and has numeric type.
         if (sharding_key)
         {
-            auto sharding_expr = buildShardingKeyExpression(sharding_key, args.context, args.columns.getAllPhysical(), true);
+            auto sharding_expr = buildShardingKeyExpression(sharding_key, args.getContext(), args.columns.getAllPhysical(), true);
             const Block & block = sharding_expr->getSampleBlock();
 
             if (block.columns() != 1)
@@ -1243,7 +1255,7 @@ void registerStorageDistributed(StorageFactory & factory)
         return StorageDistributed::create(
             args.table_id, args.columns, args.constraints,
             remote_database, remote_table, cluster_name,
-            args.context,
+            args.getContext(),
             sharding_key,
             storage_policy,
             args.relative_data_path,
diff --git a/src/Storages/StorageDistributed.h b/src/Storages/StorageDistributed.h
index 2e1b64d1960..886a8e032de 100644
--- a/src/Storages/StorageDistributed.h
+++ b/src/Storages/StorageDistributed.h
@@ -36,7 +36,7 @@ using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
   * You can pass one address, not several.
   * In this case, the table can be considered remote, rather than distributed.
   */
-class StorageDistributed final : public ext::shared_ptr_helper<StorageDistributed>, public IStorage
+class StorageDistributed final : public ext::shared_ptr_helper<StorageDistributed>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageDistributed>;
     friend class DistributedBlockOutputStream;
@@ -55,13 +55,13 @@ public:
 
     bool isRemote() const override { return true; }
 
-    QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
+    QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
 
     Pipe read(
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -71,7 +71,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/) override;
@@ -79,20 +79,20 @@ public:
     bool supportsParallelInsert() const override { return true; }
     std::optional<UInt64> totalBytes(const Settings &) const override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
-    QueryPipelinePtr distributedWrite(const ASTInsertQuery & query, const Context & context) override;
+    QueryPipelinePtr distributedWrite(const ASTInsertQuery & query, ContextPtr context) override;
 
     /// Removes temporary data in local filesystem.
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &) override;
 
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
     /// in the sub-tables, you need to manually add and delete columns
     /// the structure of the sub-table is not checked
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     void startup() override;
     void shutdown() override;
@@ -113,7 +113,7 @@ public:
     ClusterPtr getCluster() const;
 
     /// Used by InterpreterSystemQuery
-    void flushClusterNodesAllData(const Context & context);
+    void flushClusterNodesAllData(ContextPtr context);
 
     /// Used by ClusterCopier
     size_t getShardCount() const;
@@ -126,7 +126,7 @@ private:
         const String & remote_database_,
         const String & remote_table_,
         const String & cluster_name_,
-        const Context & context_,
+        ContextPtr context_,
         const ASTPtr & sharding_key_,
         const String & storage_policy_name_,
         const String & relative_data_path_,
@@ -140,7 +140,7 @@ private:
         const ConstraintsDescription & constraints_,
         ASTPtr remote_table_function_ptr_,
         const String & cluster_name_,
-        const Context & context_,
+        ContextPtr context_,
         const ASTPtr & sharding_key_,
         const String & storage_policy_name_,
         const String & relative_data_path_,
@@ -165,12 +165,13 @@ private:
     /// Used by StorageSystemDistributionQueue
     std::vector<StorageDistributedDirectoryMonitor::Status> getDirectoryMonitorsStatuses() const;
 
-    static IColumn::Selector createSelector(const ClusterPtr cluster, const ColumnWithTypeAndName & result);
+    static IColumn::Selector createSelector(ClusterPtr cluster, const ColumnWithTypeAndName & result);
     /// Apply the following settings:
     /// - optimize_skip_unused_shards
     /// - force_optimize_skip_unused_shards
-    ClusterPtr getOptimizedCluster(const Context &, const StorageMetadataPtr & metadata_snapshot, const ASTPtr & query_ptr) const;
-    ClusterPtr skipUnusedShards(ClusterPtr cluster, const ASTPtr & query_ptr, const StorageMetadataPtr & metadata_snapshot, const Context & context) const;
+    ClusterPtr getOptimizedCluster(ContextPtr, const StorageMetadataPtr & metadata_snapshot, const ASTPtr & query_ptr) const;
+    ClusterPtr
+    skipUnusedShards(ClusterPtr cluster, const ASTPtr & query_ptr, const StorageMetadataPtr & metadata_snapshot, ContextPtr context) const;
 
     size_t getRandomShardIndex(const Cluster::ShardsInfo & shards);
 
@@ -178,12 +179,10 @@ private:
 
     void delayInsertOrThrowIfNeeded() const;
 
-private:
     String remote_database;
     String remote_table;
     ASTPtr remote_table_function_ptr;
 
-    const Context & global_context;
     Poco::Logger * log;
 
     /// Used to implement TableFunctionRemote.
diff --git a/src/Storages/StorageExternalDistributed.cpp b/src/Storages/StorageExternalDistributed.cpp
index a8e02236295..3489de0161a 100644
--- a/src/Storages/StorageExternalDistributed.cpp
+++ b/src/Storages/StorageExternalDistributed.cpp
@@ -36,7 +36,7 @@ StorageExternalDistributed::StorageExternalDistributed(
     const String & password,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    const Context & context)
+    ContextPtr context)
     : IStorage(table_id_)
 {
     StorageInMemoryMetadata storage_metadata;
@@ -44,7 +44,7 @@ StorageExternalDistributed::StorageExternalDistributed(
     storage_metadata.setConstraints(constraints_);
     setInMemoryMetadata(storage_metadata);
 
-    size_t max_addresses = context.getSettingsRef().glob_expansion_max_elements;
+    size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
     std::vector<String> shards_descriptions = parseRemoteDescription(cluster_description, 0, cluster_description.size(), ',', max_addresses);
     std::vector<std::pair<std::string, UInt16>> addresses;
 
@@ -87,8 +87,8 @@ StorageExternalDistributed::StorageExternalDistributed(
                     remote_database,
                     addresses,
                     username, password,
-                    context.getSettingsRef().postgresql_connection_pool_size,
-                    context.getSettingsRef().postgresql_connection_pool_wait_timeout);
+                    context->getSettingsRef().postgresql_connection_pool_size,
+                    context->getSettingsRef().postgresql_connection_pool_wait_timeout);
 
                 shard = StoragePostgreSQL::create(
                     table_id_,
@@ -113,7 +113,7 @@ Pipe StorageExternalDistributed::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned num_streams)
@@ -148,7 +148,7 @@ void registerStorageExternalDistributed(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         for (auto & engine_arg : engine_args)
-            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.local_context);
+            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
 
         const String & engine_name = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
         const String & cluster_description = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
@@ -177,7 +177,7 @@ void registerStorageExternalDistributed(StorageFactory & factory)
             password,
             args.columns,
             args.constraints,
-            args.context);
+            args.getContext());
     },
     {
         .source_access_type = AccessType::MYSQL,
diff --git a/src/Storages/StorageExternalDistributed.h b/src/Storages/StorageExternalDistributed.h
index 6dbb8068a94..71022f5eaa3 100644
--- a/src/Storages/StorageExternalDistributed.h
+++ b/src/Storages/StorageExternalDistributed.h
@@ -37,7 +37,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -53,7 +53,7 @@ protected:
         const String & password,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        const Context & context_);
+        ContextPtr context_);
 
 private:
     using Shards = std::unordered_set<StoragePtr>;
diff --git a/src/Storages/StorageFactory.cpp b/src/Storages/StorageFactory.cpp
index 7aaec9b7e76..3a57c8ab4f6 100644
--- a/src/Storages/StorageFactory.cpp
+++ b/src/Storages/StorageFactory.cpp
@@ -31,6 +31,23 @@ static void checkAllTypesAreAllowedInTable(const NamesAndTypesList & names_and_t
 }
 
 
+ContextPtr StorageFactory::Arguments::getContext() const
+{
+    auto ptr = context.lock();
+    if (!ptr)
+        throw Exception("Context has expired", ErrorCodes::LOGICAL_ERROR);
+    return ptr;
+}
+
+ContextPtr StorageFactory::Arguments::getLocalContext() const
+{
+    auto ptr = local_context.lock();
+    if (!ptr)
+        throw Exception("Context has expired", ErrorCodes::LOGICAL_ERROR);
+    return ptr;
+}
+
+
 void StorageFactory::registerStorage(const std::string & name, CreatorFn creator_fn, StorageFeatures features)
 {
     if (!storages.emplace(name, Creator{std::move(creator_fn), features}).second)
@@ -42,8 +59,8 @@ void StorageFactory::registerStorage(const std::string & name, CreatorFn creator
 StoragePtr StorageFactory::get(
     const ASTCreateQuery & query,
     const String & relative_data_path,
-    Context & local_context,
-    Context & context,
+    ContextPtr local_context,
+    ContextPtr context,
     const ColumnsDescription & columns,
     const ConstraintsDescription & constraints,
     bool has_force_restore_data_flag) const
@@ -179,7 +196,7 @@ StoragePtr StorageFactory::get(
         .attach = query.attach,
         .has_force_restore_data_flag = has_force_restore_data_flag
     };
-    assert(&arguments.context == &arguments.context.getGlobalContext());
+    assert(arguments.getContext() == arguments.getContext()->getGlobalContext());
 
     auto res = storages.at(name).creator_fn(arguments);
     if (!empty_engine_args.empty())
@@ -191,8 +208,8 @@ StoragePtr StorageFactory::get(
         storage_def->engine->arguments->children = empty_engine_args;
     }
 
-    if (local_context.hasQueryContext() && context.getSettingsRef().log_queries)
-        local_context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Storage, name);
+    if (local_context->hasQueryContext() && context->getSettingsRef().log_queries)
+        local_context->getQueryContext()->addQueryFactoriesInfo(Context::QueryLogFactories::Storage, name);
 
     return res;
 }
diff --git a/src/Storages/StorageFactory.h b/src/Storages/StorageFactory.h
index 18dd24e10db..43f6a6d6f7d 100644
--- a/src/Storages/StorageFactory.h
+++ b/src/Storages/StorageFactory.h
@@ -39,12 +39,15 @@ public:
         /// Relative to <path> from server config (possibly <path> of some <disk> of some <volume> for *MergeTree)
         const String & relative_data_path;
         const StorageID & table_id;
-        Context & local_context;
-        Context & context;
+        ContextWeakPtr local_context;
+        ContextWeakPtr context;
         const ColumnsDescription & columns;
         const ConstraintsDescription & constraints;
         bool attach;
         bool has_force_restore_data_flag;
+
+        ContextPtr getContext() const;
+        ContextPtr getLocalContext() const;
     };
 
     /// Analog of the IStorage::supports*() helpers
@@ -76,8 +79,8 @@ public:
     StoragePtr get(
         const ASTCreateQuery & query,
         const String & relative_data_path,
-        Context & local_context,
-        Context & context,
+        ContextPtr local_context,
+        ContextPtr context,
         const ColumnsDescription & columns,
         const ConstraintsDescription & constraints,
         bool has_force_restore_data_flag) const;
diff --git a/src/Storages/StorageFile.cpp b/src/Storages/StorageFile.cpp
index 56f08802bc4..14b91d29805 100644
--- a/src/Storages/StorageFile.cpp
+++ b/src/Storages/StorageFile.cpp
@@ -116,9 +116,9 @@ std::string getTablePath(const std::string & table_dir_path, const std::string &
 }
 
 /// Both db_dir_path and table_path must be converted to absolute paths (in particular, path cannot contain '..').
-void checkCreationIsAllowed(const Context & context_global, const std::string & db_dir_path, const std::string & table_path)
+void checkCreationIsAllowed(ContextPtr context_global, const std::string & db_dir_path, const std::string & table_path)
 {
-    if (context_global.getApplicationType() != Context::ApplicationType::SERVER)
+    if (context_global->getApplicationType() != Context::ApplicationType::SERVER)
         return;
 
     /// "/dev/null" is allowed for perf testing
@@ -131,7 +131,7 @@ void checkCreationIsAllowed(const Context & context_global, const std::string &
 }
 }
 
-Strings StorageFile::getPathsList(const String & table_path, const String & user_files_path, const Context & context)
+Strings StorageFile::getPathsList(const String & table_path, const String & user_files_path, ContextPtr context)
 {
     String user_files_absolute_path = Poco::Path(user_files_path).makeAbsolute().makeDirectory().toString();
     Poco::Path poco_path = Poco::Path(table_path);
@@ -159,7 +159,7 @@ bool StorageFile::isColumnOriented() const
 StorageFile::StorageFile(int table_fd_, CommonArguments args)
     : StorageFile(args)
 {
-    if (args.context.getApplicationType() == Context::ApplicationType::SERVER)
+    if (args.getContext()->getApplicationType() == Context::ApplicationType::SERVER)
         throw Exception("Using file descriptor as source of storage isn't allowed for server daemons", ErrorCodes::DATABASE_ACCESS_DENIED);
     if (args.format_name == "Distributed")
         throw Exception("Distributed format is allowed only with explicit file path", ErrorCodes::INCORRECT_FILE_NAME);
@@ -177,7 +177,7 @@ StorageFile::StorageFile(const std::string & table_path_, const std::string & us
     : StorageFile(args)
 {
     is_db_table = false;
-    paths = getPathsList(table_path_, user_files_path, args.context);
+    paths = getPathsList(table_path_, user_files_path, args.getContext());
 
     if (args.format_name == "Distributed")
     {
@@ -214,7 +214,7 @@ StorageFile::StorageFile(CommonArguments args)
     , format_name(args.format_name)
     , format_settings(args.format_settings)
     , compression_method(args.compression_method)
-    , base_path(args.context.getPath())
+    , base_path(args.getContext()->getPath())
 {
     StorageInMemoryMetadata storage_metadata;
     if (args.format_name != "Distributed")
@@ -225,9 +225,9 @@ StorageFile::StorageFile(CommonArguments args)
 }
 
 
-static std::chrono::seconds getLockTimeout(const Context & context)
+static std::chrono::seconds getLockTimeout(ContextPtr context)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     Int64 lock_timeout = settings.lock_acquire_timeout.totalSeconds();
     if (settings.max_execution_time.totalSeconds() != 0 && settings.max_execution_time.totalSeconds() < lock_timeout)
         lock_timeout = settings.max_execution_time.totalSeconds();
@@ -281,7 +281,7 @@ public:
     StorageFileSource(
         std::shared_ptr<StorageFile> storage_,
         const StorageMetadataPtr & metadata_snapshot_,
-        const Context & context_,
+        ContextPtr context_,
         UInt64 max_block_size_,
         FilesInfoPtr files_info_,
         ColumnsDescription columns_description_)
@@ -432,7 +432,7 @@ private:
 
     ColumnsDescription columns_description;
 
-    const Context & context;    /// TODO Untangle potential issues with context lifetime.
+    ContextPtr context;    /// TODO Untangle potential issues with context lifetime.
     UInt64 max_block_size;
 
     bool finished_generate = false;
@@ -445,7 +445,7 @@ Pipe StorageFile::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
@@ -457,7 +457,7 @@ Pipe StorageFile::read(
     else
         if (paths.size() == 1 && !Poco::File(paths[0]).exists())
         {
-            if (context.getSettingsRef().engine_file_empty_if_not_exists)
+            if (context->getSettingsRef().engine_file_empty_if_not_exists)
                 return Pipe(std::make_shared<NullSource>(metadata_snapshot->getSampleBlockForColumns(column_names, getVirtuals(), getStorageID())));
             else
                 throw Exception("File " + paths[0] + " doesn't exist", ErrorCodes::FILE_DOESNT_EXIST);
@@ -509,7 +509,7 @@ public:
         const StorageMetadataPtr & metadata_snapshot_,
         std::unique_lock<std::shared_timed_mutex> && lock_,
         const CompressionMethod compression_method,
-        const Context & context,
+        ContextPtr context,
         const std::optional<FormatSettings> & format_settings,
         int & flags)
         : storage(storage_)
@@ -584,7 +584,7 @@ private:
 BlockOutputStreamPtr StorageFile::write(
     const ASTPtr & /*query*/,
     const StorageMetadataPtr & metadata_snapshot,
-    const Context & context)
+    ContextPtr context)
 {
     if (format_name == "Distributed")
         throw Exception("Method write is not implemented for Distributed format", ErrorCodes::NOT_IMPLEMENTED);
@@ -592,7 +592,7 @@ BlockOutputStreamPtr StorageFile::write(
     int flags = 0;
 
     std::string path;
-    if (context.getSettingsRef().engine_file_truncate_on_insert)
+    if (context->getSettingsRef().engine_file_truncate_on_insert)
         flags |= O_TRUNC;
 
     if (!paths.empty())
@@ -645,7 +645,7 @@ void StorageFile::rename(const String & new_path_to_table_data, const StorageID
 void StorageFile::truncate(
     const ASTPtr & /*query*/,
     const StorageMetadataPtr & /* metadata_snapshot */,
-    const Context & /* context */,
+    ContextPtr /* context */,
     TableExclusiveLockHolder &)
 {
     if (paths.size() != 1)
@@ -678,11 +678,15 @@ void registerStorageFile(StorageFactory & factory)
         "File",
         [](const StorageFactory::Arguments & factory_args)
         {
-            StorageFile::CommonArguments storage_args{
-                .table_id = factory_args.table_id,
-                .columns = factory_args.columns,
-                .constraints = factory_args.constraints,
-                .context = factory_args.context
+            StorageFile::CommonArguments storage_args
+            {
+                WithContext(factory_args.getContext()),
+                factory_args.table_id,
+                {},
+                {},
+                {},
+                factory_args.columns,
+                factory_args.constraints,
             };
 
             ASTs & engine_args_ast = factory_args.engine_args;
@@ -692,7 +696,7 @@ void registerStorageFile(StorageFactory & factory)
                     "Storage File requires from 1 to 3 arguments: name of used format, source and compression_method.",
                     ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
-            engine_args_ast[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args_ast[0], factory_args.local_context);
+            engine_args_ast[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args_ast[0], factory_args.getLocalContext());
             storage_args.format_name = engine_args_ast[0]->as<ASTLiteral &>().value.safeGet<String>();
 
             // Use format settings from global server context + settings from
@@ -704,7 +708,7 @@ void registerStorageFile(StorageFactory & factory)
 
                 // Apply changed settings from global context, but ignore the
                 // unknown ones, because we only have the format settings here.
-                const auto & changes = factory_args.context.getSettingsRef().changes();
+                const auto & changes = factory_args.getContext()->getSettingsRef().changes();
                 for (const auto & change : changes)
                 {
                     if (user_format_settings.has(change.name))
@@ -718,12 +722,12 @@ void registerStorageFile(StorageFactory & factory)
                     factory_args.storage_def->settings->changes);
 
                 storage_args.format_settings = getFormatSettings(
-                    factory_args.context, user_format_settings);
+                    factory_args.getContext(), user_format_settings);
             }
             else
             {
                 storage_args.format_settings = getFormatSettings(
-                    factory_args.context);
+                    factory_args.getContext());
             }
 
             if (engine_args_ast.size() == 1) /// Table in database
@@ -760,7 +764,7 @@ void registerStorageFile(StorageFactory & factory)
 
             if (engine_args_ast.size() == 3)
             {
-                engine_args_ast[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args_ast[2], factory_args.local_context);
+                engine_args_ast[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args_ast[2], factory_args.getLocalContext());
                 storage_args.compression_method = engine_args_ast[2]->as<ASTLiteral &>().value.safeGet<String>();
             }
             else
@@ -769,7 +773,7 @@ void registerStorageFile(StorageFactory & factory)
             if (0 <= source_fd) /// File descriptor
                 return StorageFile::create(source_fd, storage_args);
             else /// User's file
-                return StorageFile::create(source_path, factory_args.context.getUserFilesPath(), storage_args);
+                return StorageFile::create(source_path, factory_args.getContext()->getUserFilesPath(), storage_args);
         },
         storage_features);
 }
diff --git a/src/Storages/StorageFile.h b/src/Storages/StorageFile.h
index 27f7419321c..a277dda7cc0 100644
--- a/src/Storages/StorageFile.h
+++ b/src/Storages/StorageFile.h
@@ -28,7 +28,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -36,12 +36,12 @@ public:
     BlockOutputStreamPtr write(
         const ASTPtr & query,
         const StorageMetadataPtr & /*metadata_snapshot*/,
-        const Context & context) override;
+        ContextPtr context) override;
 
     void truncate(
         const ASTPtr & /*query*/,
         const StorageMetadataPtr & /* metadata_snapshot */,
-        const Context & /* context */,
+        ContextPtr /* context */,
         TableExclusiveLockHolder &) override;
 
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
@@ -49,7 +49,7 @@ public:
     bool storesDataOnDisk() const override;
     Strings getDataPaths() const override;
 
-    struct CommonArguments
+    struct CommonArguments : public WithContext
     {
         StorageID table_id;
         std::string format_name;
@@ -57,12 +57,11 @@ public:
         std::string compression_method;
         const ColumnsDescription & columns;
         const ConstraintsDescription & constraints;
-        const Context & context;
     };
 
     NamesAndTypesList getVirtuals() const override;
 
-    static Strings getPathsList(const String & table_path, const String & user_files_path, const Context & context);
+    static Strings getPathsList(const String & table_path, const String & user_files_path, ContextPtr context);
 
     /// Check if the format is column-oriented.
     /// Is is useful because column oriented formats could effectively skip unknown columns
diff --git a/src/Storages/StorageGenerateRandom.cpp b/src/Storages/StorageGenerateRandom.cpp
index f06daa3a2bd..bc158c38f37 100644
--- a/src/Storages/StorageGenerateRandom.cpp
+++ b/src/Storages/StorageGenerateRandom.cpp
@@ -65,7 +65,7 @@ ColumnPtr fillColumnWithRandomData(
     UInt64 max_array_length,
     UInt64 max_string_length,
     pcg64 & rng,
-    const Context & context)
+    ContextPtr context)
 {
     TypeIndex idx = type->getTypeId();
 
@@ -339,7 +339,7 @@ ColumnPtr fillColumnWithRandomData(
 class GenerateSource : public SourceWithProgress
 {
 public:
-    GenerateSource(UInt64 block_size_, UInt64 max_array_length_, UInt64 max_string_length_, UInt64 random_seed_, Block block_header_, const Context & context_)
+    GenerateSource(UInt64 block_size_, UInt64 max_array_length_, UInt64 max_string_length_, UInt64 random_seed_, Block block_header_, ContextPtr context_)
         : SourceWithProgress(Nested::flatten(prepareBlockToFill(block_header_)))
         , block_size(block_size_), max_array_length(max_array_length_), max_string_length(max_string_length_)
         , block_to_fill(std::move(block_header_)), rng(random_seed_), context(context_) {}
@@ -367,7 +367,7 @@ private:
 
     pcg64 rng;
 
-    const Context & context;
+    ContextPtr context;
 
     static Block & prepareBlockToFill(Block & block)
     {
@@ -442,7 +442,7 @@ Pipe StorageGenerateRandom::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
diff --git a/src/Storages/StorageGenerateRandom.h b/src/Storages/StorageGenerateRandom.h
index 965c5b3a9d3..d9c2acb782b 100644
--- a/src/Storages/StorageGenerateRandom.h
+++ b/src/Storages/StorageGenerateRandom.h
@@ -19,7 +19,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageInput.cpp b/src/Storages/StorageInput.cpp
index 1f881bccf07..63b440aff08 100644
--- a/src/Storages/StorageInput.cpp
+++ b/src/Storages/StorageInput.cpp
@@ -27,17 +27,14 @@ StorageInput::StorageInput(const StorageID & table_id, const ColumnsDescription
 }
 
 
-class StorageInputSource : public SourceWithProgress
+class StorageInputSource : public SourceWithProgress, WithContext
 {
 public:
-    StorageInputSource(Context & context_, Block sample_block)
-        : SourceWithProgress(std::move(sample_block)), context(context_)
-    {
-    }
+    StorageInputSource(ContextPtr context_, Block sample_block) : SourceWithProgress(std::move(sample_block)), WithContext(context_) {}
 
     Chunk generate() override
     {
-        auto block = context.getInputBlocksReaderCallback()(context);
+        auto block = getContext()->getInputBlocksReaderCallback()(getContext());
         if (!block)
             return {};
 
@@ -46,9 +43,6 @@ public:
     }
 
     String getName() const override { return "Input"; }
-
-private:
-    Context & context;
 };
 
 
@@ -62,18 +56,18 @@ Pipe StorageInput::read(
     const Names & /*column_names*/,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t /*max_block_size*/,
     unsigned /*num_streams*/)
 {
     Pipes pipes;
-    Context & query_context = const_cast<Context &>(context).getQueryContext();
+    auto query_context = context->getQueryContext();
     /// It is TCP request if we have callbacks for input().
-    if (query_context.getInputBlocksReaderCallback())
+    if (query_context->getInputBlocksReaderCallback())
     {
         /// Send structure to the client.
-        query_context.initializeInput(shared_from_this());
+        query_context->initializeInput(shared_from_this());
         return Pipe(std::make_shared<StorageInputSource>(query_context, metadata_snapshot->getSampleBlock()));
     }
 
diff --git a/src/Storages/StorageInput.h b/src/Storages/StorageInput.h
index 3cb64993d45..106c22db385 100644
--- a/src/Storages/StorageInput.h
+++ b/src/Storages/StorageInput.h
@@ -21,7 +21,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageJoin.cpp b/src/Storages/StorageJoin.cpp
index a449cebba51..983b9213a35 100644
--- a/src/Storages/StorageJoin.cpp
+++ b/src/Storages/StorageJoin.cpp
@@ -68,7 +68,7 @@ StorageJoin::StorageJoin(
 
 
 void StorageJoin::truncate(
-    const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder&)
+    const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder&)
 {
     disk->removeRecursive(path);
     disk->createDirectories(path);
@@ -146,7 +146,7 @@ void registerStorageJoin(StorageFactory & factory)
 
         ASTs & engine_args = args.engine_args;
 
-        const auto & settings = args.context.getSettingsRef();
+        const auto & settings = args.getContext()->getSettingsRef();
 
         auto join_use_nulls = settings.join_use_nulls;
         auto max_rows_in_join = settings.max_rows_in_join;
@@ -186,7 +186,7 @@ void registerStorageJoin(StorageFactory & factory)
             }
         }
 
-        DiskPtr disk = args.context.getDisk(disk_name);
+        DiskPtr disk = args.getContext()->getDisk(disk_name);
 
         if (engine_args.size() < 3)
             throw Exception(
@@ -492,7 +492,7 @@ Pipe StorageJoin::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned /*num_streams*/)
diff --git a/src/Storages/StorageJoin.h b/src/Storages/StorageJoin.h
index 5f0f9f92404..4baac53c69c 100644
--- a/src/Storages/StorageJoin.h
+++ b/src/Storages/StorageJoin.h
@@ -27,7 +27,7 @@ class StorageJoin final : public ext::shared_ptr_helper<StorageJoin>, public Sto
 public:
     String getName() const override { return "Join"; }
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
 
     /// Return instance of HashJoin holding lock that protects from insertions to StorageJoin.
     /// HashJoin relies on structure of hash table that's why we need to return it with locked mutex.
@@ -45,7 +45,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageLog.cpp b/src/Storages/StorageLog.cpp
index 9fdd466e792..8ed68e0b44d 100644
--- a/src/Storages/StorageLog.cpp
+++ b/src/Storages/StorageLog.cpp
@@ -591,7 +591,7 @@ void StorageLog::rename(const String & new_path_to_table_data, const StorageID &
     renameInMemory(new_table_id);
 }
 
-void StorageLog::truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &)
+void StorageLog::truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &)
 {
     files.clear();
     file_count = 0;
@@ -633,9 +633,9 @@ const StorageLog::Marks & StorageLog::getMarksWithRealRowCount(const StorageMeta
 }
 
 
-static std::chrono::seconds getLockTimeout(const Context & context)
+static std::chrono::seconds getLockTimeout(ContextPtr context)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     Int64 lock_timeout = settings.lock_acquire_timeout.totalSeconds();
     if (settings.max_execution_time.totalSeconds() != 0 && settings.max_execution_time.totalSeconds() < lock_timeout)
         lock_timeout = settings.max_execution_time.totalSeconds();
@@ -647,7 +647,7 @@ Pipe StorageLog::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
@@ -672,7 +672,7 @@ Pipe StorageLog::read(
     if (num_streams > marks_size)
         num_streams = marks_size;
 
-    size_t max_read_buffer_size = context.getSettingsRef().max_read_buffer_size;
+    size_t max_read_buffer_size = context->getSettingsRef().max_read_buffer_size;
 
     for (size_t stream = 0; stream < num_streams; ++stream)
     {
@@ -695,7 +695,7 @@ Pipe StorageLog::read(
     return Pipe::unitePipes(std::move(pipes));
 }
 
-BlockOutputStreamPtr StorageLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr context)
 {
     auto lock_timeout = getLockTimeout(context);
     loadMarks(lock_timeout);
@@ -707,7 +707,7 @@ BlockOutputStreamPtr StorageLog::write(const ASTPtr & /*query*/, const StorageMe
     return std::make_shared<LogBlockOutputStream>(*this, metadata_snapshot, std::move(lock));
 }
 
-CheckResults StorageLog::checkData(const ASTPtr & /* query */, const Context & context)
+CheckResults StorageLog::checkData(const ASTPtr & /* query */, ContextPtr context)
 {
     std::shared_lock lock(rwlock, getLockTimeout(context));
     if (!lock)
@@ -731,11 +731,11 @@ void registerStorageLog(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         String disk_name = getDiskName(*args.storage_def);
-        DiskPtr disk = args.context.getDisk(disk_name);
+        DiskPtr disk = args.getContext()->getDisk(disk_name);
 
         return StorageLog::create(
             disk, args.relative_data_path, args.table_id, args.columns, args.constraints,
-            args.attach, args.context.getSettings().max_compress_block_size);
+            args.attach, args.getContext()->getSettings().max_compress_block_size);
     }, features);
 }
 
diff --git a/src/Storages/StorageLog.h b/src/Storages/StorageLog.h
index a08e0f9a629..4fbaf53529f 100644
--- a/src/Storages/StorageLog.h
+++ b/src/Storages/StorageLog.h
@@ -29,18 +29,18 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
 
-    CheckResults checkData(const ASTPtr & /* query */, const Context & /* context */) override;
+    CheckResults checkData(const ASTPtr & /* query */, ContextPtr /* context */) override;
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
 
     bool storesDataOnDisk() const override { return true; }
     Strings getDataPaths() const override { return {DB::fullPath(disk, table_path)}; }
diff --git a/src/Storages/StorageMaterializeMySQL.cpp b/src/Storages/StorageMaterializeMySQL.cpp
index e59f1e22958..a15e4957abe 100644
--- a/src/Storages/StorageMaterializeMySQL.cpp
+++ b/src/Storages/StorageMaterializeMySQL.cpp
@@ -39,7 +39,7 @@ Pipe StorageMaterializeMySQL::read(
     const Names & column_names,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned int num_streams)
@@ -48,7 +48,7 @@ Pipe StorageMaterializeMySQL::read(
     rethrowSyncExceptionIfNeed(database);
 
     NameSet column_names_set = NameSet(column_names.begin(), column_names.end());
-    auto lock = nested_storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock = nested_storage->lockForShare(context->getCurrentQueryId(), context->getSettingsRef().lock_acquire_timeout);
     const StorageMetadataPtr & nested_metadata = nested_storage->getInMemoryMetadataPtr();
 
     Block nested_header = nested_metadata->getSampleBlock();
diff --git a/src/Storages/StorageMaterializeMySQL.h b/src/Storages/StorageMaterializeMySQL.h
index f787470e2d2..8a4b88cbbb4 100644
--- a/src/Storages/StorageMaterializeMySQL.h
+++ b/src/Storages/StorageMaterializeMySQL.h
@@ -26,9 +26,9 @@ public:
 
     Pipe read(
         const Names & column_names, const StorageMetadataPtr & metadata_snapshot, SelectQueryInfo & query_info,
-        const Context & context, QueryProcessingStage::Enum processed_stage, size_t max_block_size, unsigned num_streams) override;
+        ContextPtr context, QueryProcessingStage::Enum processed_stage, size_t max_block_size, unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr &, const StorageMetadataPtr &, const Context &) override { throwNotAllowed(); }
+    BlockOutputStreamPtr write(const ASTPtr &, const StorageMetadataPtr &, ContextPtr) override { throwNotAllowed(); }
 
     NamesAndTypesList getVirtuals() const override;
     ColumnSizeByName getColumnSizes() const override;
diff --git a/src/Storages/StorageMaterializedView.cpp b/src/Storages/StorageMaterializedView.cpp
index c89187a46e2..ffd57008e6e 100644
--- a/src/Storages/StorageMaterializedView.cpp
+++ b/src/Storages/StorageMaterializedView.cpp
@@ -50,11 +50,11 @@ static inline String generateInnerTableName(const StorageID & view_id)
 
 StorageMaterializedView::StorageMaterializedView(
     const StorageID & table_id_,
-    Context & local_context,
+    ContextPtr local_context,
     const ASTCreateQuery & query,
     const ColumnsDescription & columns_,
     bool attach_)
-    : IStorage(table_id_), global_context(local_context.getGlobalContext())
+    : IStorage(table_id_), WithContext(local_context->getGlobalContext())
 {
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -90,7 +90,7 @@ StorageMaterializedView::StorageMaterializedView(
     else
     {
         /// We will create a query to create an internal table.
-        auto create_context = Context(local_context);
+        auto create_context = Context::createCopy(local_context);
         auto manual_create_query = std::make_shared<ASTCreateQuery>();
         manual_create_query->database = getStorageID().database_name;
         manual_create_query->table = generateInnerTableName(getStorageID());
@@ -106,32 +106,33 @@ StorageMaterializedView::StorageMaterializedView(
         create_interpreter.setInternal(true);
         create_interpreter.execute();
 
-        target_table_id = DatabaseCatalog::instance().getTable({manual_create_query->database, manual_create_query->table}, global_context)->getStorageID();
+        target_table_id = DatabaseCatalog::instance().getTable({manual_create_query->database, manual_create_query->table}, getContext())->getStorageID();
     }
 
     if (!select.select_table_id.empty())
         DatabaseCatalog::instance().addDependency(select.select_table_id, getStorageID());
 }
 
-QueryProcessingStage::Enum StorageMaterializedView::getQueryProcessingStage(const Context & context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
+QueryProcessingStage::Enum StorageMaterializedView::getQueryProcessingStage(
+    ContextPtr local_context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
 {
-    return getTargetTable()->getQueryProcessingStage(context, to_stage, query_info);
+    return getTargetTable()->getQueryProcessingStage(local_context, to_stage, query_info);
 }
 
 Pipe StorageMaterializedView::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     QueryPlan plan;
-    read(plan, column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    read(plan, column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
     return plan.convertToPipe(
-        QueryPlanOptimizationSettings::fromContext(context),
-        BuildQueryPipelineSettings::fromContext(context));
+        QueryPlanOptimizationSettings::fromContext(local_context),
+        BuildQueryPipelineSettings::fromContext(local_context));
 }
 
 void StorageMaterializedView::read(
@@ -139,23 +140,23 @@ void StorageMaterializedView::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     auto storage = getTargetTable();
-    auto lock = storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock = storage->lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
     auto target_metadata_snapshot = storage->getInMemoryMetadataPtr();
 
     if (query_info.order_optimizer)
-        query_info.input_order_info = query_info.order_optimizer->getInputOrder(target_metadata_snapshot, context);
+        query_info.input_order_info = query_info.order_optimizer->getInputOrder(target_metadata_snapshot, local_context);
 
-    storage->read(query_plan, column_names, target_metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    storage->read(query_plan, column_names, target_metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
 
     if (query_plan.isInitialized())
     {
-        auto mv_header = getHeaderForProcessingStage(*this, column_names, metadata_snapshot, query_info, context, processed_stage);
+        auto mv_header = getHeaderForProcessingStage(*this, column_names, metadata_snapshot, query_info, local_context, processed_stage);
         auto target_header = query_plan.getCurrentDataStream().header;
         if (!blocksHaveEqualStructure(mv_header, target_header))
         {
@@ -185,20 +186,20 @@ void StorageMaterializedView::read(
     }
 }
 
-BlockOutputStreamPtr StorageMaterializedView::write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context)
+BlockOutputStreamPtr StorageMaterializedView::write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr local_context)
 {
     auto storage = getTargetTable();
-    auto lock = storage->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock = storage->lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
 
     auto metadata_snapshot = storage->getInMemoryMetadataPtr();
-    auto stream = storage->write(query, metadata_snapshot, context);
+    auto stream = storage->write(query, metadata_snapshot, local_context);
 
     stream->addTableLock(lock);
     return stream;
 }
 
 
-static void executeDropQuery(ASTDropQuery::Kind kind, const Context & global_context, const Context & current_context, const StorageID & target_table_id, bool no_delay)
+static void executeDropQuery(ASTDropQuery::Kind kind, ContextPtr global_context, ContextPtr current_context, const StorageID & target_table_id, bool no_delay)
 {
     if (DatabaseCatalog::instance().tryGetTable(target_table_id, current_context))
     {
@@ -214,13 +215,13 @@ static void executeDropQuery(ASTDropQuery::Kind kind, const Context & global_con
         /// to avoid "Not enough privileges" error if current user has only DROP VIEW ON mat_view_name privilege
         /// and not allowed to drop inner table explicitly. Allowing to drop inner table without explicit grant
         /// looks like expected behaviour and we have tests for it.
-        auto drop_context = Context(global_context);
-        drop_context.getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
-        if (auto txn = current_context.getZooKeeperMetadataTransaction())
+        auto drop_context = Context::createCopy(global_context);
+        drop_context->getClientInfo().query_kind = ClientInfo::QueryKind::SECONDARY_QUERY;
+        if (auto txn = current_context->getZooKeeperMetadataTransaction())
         {
             /// For Replicated database
-            drop_context.setQueryContext(const_cast<Context &>(current_context));
-            drop_context.initZooKeeperMetadataTransaction(txn, true);
+            drop_context->setQueryContext(current_context);
+            drop_context->initZooKeeperMetadataTransaction(txn, true);
         }
         InterpreterDropQuery drop_interpreter(ast_drop_query, drop_context);
         drop_interpreter.execute();
@@ -235,19 +236,19 @@ void StorageMaterializedView::drop()
     if (!select_query.select_table_id.empty())
         DatabaseCatalog::instance().removeDependency(select_query.select_table_id, table_id);
 
-    dropInnerTable(true, global_context);
+    dropInnerTable(true, getContext());
 }
 
-void StorageMaterializedView::dropInnerTable(bool no_delay, const Context & context)
+void StorageMaterializedView::dropInnerTable(bool no_delay, ContextPtr local_context)
 {
     if (has_inner_table && tryGetTargetTable())
-        executeDropQuery(ASTDropQuery::Kind::Drop, global_context, context, target_table_id, no_delay);
+        executeDropQuery(ASTDropQuery::Kind::Drop, getContext(), local_context, target_table_id, no_delay);
 }
 
-void StorageMaterializedView::truncate(const ASTPtr &, const StorageMetadataPtr &, const Context & context, TableExclusiveLockHolder &)
+void StorageMaterializedView::truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr local_context, TableExclusiveLockHolder &)
 {
     if (has_inner_table)
-        executeDropQuery(ASTDropQuery::Kind::Truncate, global_context, context, target_table_id, true);
+        executeDropQuery(ASTDropQuery::Kind::Truncate, getContext(), local_context, target_table_id, true);
 }
 
 void StorageMaterializedView::checkStatementCanBeForwarded() const
@@ -265,26 +266,26 @@ bool StorageMaterializedView::optimize(
     bool final,
     bool deduplicate,
     const Names & deduplicate_by_columns,
-    const Context & context)
+    ContextPtr local_context)
 {
     checkStatementCanBeForwarded();
     auto storage_ptr = getTargetTable();
     auto metadata_snapshot = storage_ptr->getInMemoryMetadataPtr();
-    return getTargetTable()->optimize(query, metadata_snapshot, partition, final, deduplicate, deduplicate_by_columns, context);
+    return getTargetTable()->optimize(query, metadata_snapshot, partition, final, deduplicate, deduplicate_by_columns, local_context);
 }
 
 void StorageMaterializedView::alter(
     const AlterCommands & params,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder &)
 {
     auto table_id = getStorageID();
     StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
     StorageInMemoryMetadata old_metadata = getInMemoryMetadata();
-    params.apply(new_metadata, context);
+    params.apply(new_metadata, local_context);
 
     /// start modify query
-    if (context.getSettingsRef().allow_experimental_alter_materialized_view_structure)
+    if (local_context->getSettingsRef().allow_experimental_alter_materialized_view_structure)
     {
         const auto & new_select = new_metadata.select;
         const auto & old_select = old_metadata.getSelectQuery();
@@ -295,14 +296,14 @@ void StorageMaterializedView::alter(
     }
     /// end modify query
 
-    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
+    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
     setInMemoryMetadata(new_metadata);
 }
 
 
-void StorageMaterializedView::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void StorageMaterializedView::checkAlterIsPossible(const AlterCommands & commands, ContextPtr local_context) const
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
     if (settings.allow_experimental_alter_materialized_view_structure)
     {
         for (const auto & command : commands)
@@ -332,10 +333,10 @@ void StorageMaterializedView::checkMutationIsPossible(const MutationCommands & c
 }
 
 Pipe StorageMaterializedView::alterPartition(
-    const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, const Context & context)
+    const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, ContextPtr local_context)
 {
     checkStatementCanBeForwarded();
-    return getTargetTable()->alterPartition(metadata_snapshot, commands, context);
+    return getTargetTable()->alterPartition(metadata_snapshot, commands, local_context);
 }
 
 void StorageMaterializedView::checkAlterPartitionIsPossible(
@@ -345,10 +346,10 @@ void StorageMaterializedView::checkAlterPartitionIsPossible(
     getTargetTable()->checkAlterPartitionIsPossible(commands, metadata_snapshot, settings);
 }
 
-void StorageMaterializedView::mutate(const MutationCommands & commands, const Context & context)
+void StorageMaterializedView::mutate(const MutationCommands & commands, ContextPtr local_context)
 {
     checkStatementCanBeForwarded();
-    getTargetTable()->mutate(commands, context);
+    getTargetTable()->mutate(commands, local_context);
 }
 
 void StorageMaterializedView::renameInMemory(const StorageID & new_table_id)
@@ -375,7 +376,7 @@ void StorageMaterializedView::renameInMemory(const StorageID & new_table_id)
         elem.to = to;
         rename->elements.emplace_back(elem);
 
-        InterpreterRenameQuery(rename, global_context).execute();
+        InterpreterRenameQuery(rename, getContext()).execute();
         target_table_id.table_name = new_target_table_name;
     }
 
@@ -397,13 +398,13 @@ void StorageMaterializedView::shutdown()
 StoragePtr StorageMaterializedView::getTargetTable() const
 {
     checkStackSize();
-    return DatabaseCatalog::instance().getTable(target_table_id, global_context);
+    return DatabaseCatalog::instance().getTable(target_table_id, getContext());
 }
 
 StoragePtr StorageMaterializedView::tryGetTargetTable() const
 {
     checkStackSize();
-    return DatabaseCatalog::instance().tryGetTable(target_table_id, global_context);
+    return DatabaseCatalog::instance().tryGetTable(target_table_id, getContext());
 }
 
 Strings StorageMaterializedView::getDataPaths() const
@@ -424,7 +425,7 @@ void registerStorageMaterializedView(StorageFactory & factory)
     {
         /// Pass local_context here to convey setting for inner table
         return StorageMaterializedView::create(
-            args.table_id, args.local_context, args.query,
+            args.table_id, args.getLocalContext(), args.query,
             args.columns, args.attach);
     });
 }
diff --git a/src/Storages/StorageMaterializedView.h b/src/Storages/StorageMaterializedView.h
index a5dc089d68e..cda8112a8c3 100644
--- a/src/Storages/StorageMaterializedView.h
+++ b/src/Storages/StorageMaterializedView.h
@@ -12,7 +12,7 @@
 namespace DB
 {
 
-class StorageMaterializedView final : public ext::shared_ptr_helper<StorageMaterializedView>, public IStorage
+class StorageMaterializedView final : public ext::shared_ptr_helper<StorageMaterializedView>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageMaterializedView>;
 public:
@@ -27,19 +27,19 @@ public:
     bool supportsIndexForIn() const override { return getTargetTable()->supportsIndexForIn(); }
     bool supportsParallelInsert() const override { return getTargetTable()->supportsParallelInsert(); }
     bool supportsSubcolumns() const override { return getTargetTable()->supportsSubcolumns(); }
-    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & /* metadata_snapshot */) const override
+    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & /* metadata_snapshot */) const override
     {
         auto target_table = getTargetTable();
         auto metadata_snapshot = target_table->getInMemoryMetadataPtr();
         return target_table->mayBenefitFromIndexForIn(left_in_operand, query_context, metadata_snapshot);
     }
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     void drop() override;
-    void dropInnerTable(bool no_delay, const Context & context);
+    void dropInnerTable(bool no_delay, ContextPtr context);
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &) override;
 
     bool optimize(
         const ASTPtr & query,
@@ -48,25 +48,25 @@ public:
         bool final,
         bool deduplicate,
         const Names & deduplicate_by_columns,
-        const Context & context) override;
+        ContextPtr context) override;
 
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     void checkMutationIsPossible(const MutationCommands & commands, const Settings & settings) const override;
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
-    Pipe alterPartition(const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, const Context & context) override;
+    Pipe alterPartition(const StorageMetadataPtr & metadata_snapshot, const PartitionCommands & commands, ContextPtr context) override;
 
     void checkAlterPartitionIsPossible(const PartitionCommands & commands, const StorageMetadataPtr & metadata_snapshot, const Settings & settings) const override;
 
-    void mutate(const MutationCommands & commands, const Context & context) override;
+    void mutate(const MutationCommands & commands, ContextPtr context) override;
 
     void renameInMemory(const StorageID & new_table_id) override;
 
     void shutdown() override;
 
-    QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
+    QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
 
     StoragePtr getTargetTable() const;
     StoragePtr tryGetTargetTable() const;
@@ -77,7 +77,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -87,7 +87,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -98,7 +98,6 @@ private:
     /// Will be initialized in constructor
     StorageID target_table_id = StorageID::createEmpty();
 
-    Context & global_context;
     bool has_inner_table = false;
 
     void checkStatementCanBeForwarded() const;
@@ -106,7 +105,7 @@ private:
 protected:
     StorageMaterializedView(
         const StorageID & table_id_,
-        Context & local_context,
+        ContextPtr local_context,
         const ASTCreateQuery & query,
         const ColumnsDescription & columns_,
         bool attach_);
diff --git a/src/Storages/StorageMemory.cpp b/src/Storages/StorageMemory.cpp
index 5e4185e280b..4cae7367606 100644
--- a/src/Storages/StorageMemory.cpp
+++ b/src/Storages/StorageMemory.cpp
@@ -178,7 +178,7 @@ Pipe StorageMemory::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t /*max_block_size*/,
     unsigned num_streams)
@@ -226,7 +226,7 @@ Pipe StorageMemory::read(
 }
 
 
-BlockOutputStreamPtr StorageMemory::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
+BlockOutputStreamPtr StorageMemory::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/)
 {
     return std::make_shared<MemoryBlockOutputStream>(*this, metadata_snapshot);
 }
@@ -254,7 +254,7 @@ void StorageMemory::checkMutationIsPossible(const MutationCommands & /*commands*
     /// Some validation will be added
 }
 
-void StorageMemory::mutate(const MutationCommands & commands, const Context & context)
+void StorageMemory::mutate(const MutationCommands & commands, ContextPtr context)
 {
     std::lock_guard lock(mutex);
     auto metadata_snapshot = getInMemoryMetadataPtr();
@@ -316,7 +316,7 @@ void StorageMemory::mutate(const MutationCommands & commands, const Context & co
 
 
 void StorageMemory::truncate(
-    const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &)
+    const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &)
 {
     data.set(std::make_unique<Blocks>());
     total_size_bytes.store(0, std::memory_order_relaxed);
diff --git a/src/Storages/StorageMemory.h b/src/Storages/StorageMemory.h
index bf009c40553..1118474deee 100644
--- a/src/Storages/StorageMemory.h
+++ b/src/Storages/StorageMemory.h
@@ -34,7 +34,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -47,14 +47,14 @@ public:
 
     bool hasEvenlyDistributedRead() const override { return true; }
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, ContextPtr context) override;
 
     void drop() override;
 
     void checkMutationIsPossible(const MutationCommands & commands, const Settings & settings) const override;
-    void mutate(const MutationCommands & commands, const Context & context) override;
+    void mutate(const MutationCommands & commands, ContextPtr context) override;
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &) override;
 
     std::optional<UInt64> totalRows(const Settings &) const override;
     std::optional<UInt64> totalBytes(const Settings &) const override;
diff --git a/src/Storages/StorageMerge.cpp b/src/Storages/StorageMerge.cpp
index 7730ef98c93..041994103f9 100644
--- a/src/Storages/StorageMerge.cpp
+++ b/src/Storages/StorageMerge.cpp
@@ -44,7 +44,7 @@ namespace ErrorCodes
 namespace
 {
 
-TreeRewriterResult modifySelect(ASTSelectQuery & select, const TreeRewriterResult & rewriter_result, const Context & context)
+TreeRewriterResult modifySelect(ASTSelectQuery & select, const TreeRewriterResult & rewriter_result, ContextPtr context)
 {
 
     TreeRewriterResult new_rewriter_result = rewriter_result;
@@ -104,11 +104,11 @@ StorageMerge::StorageMerge(
     const ColumnsDescription & columns_,
     const String & source_database_,
     const Strings & source_tables_,
-    const Context & context_)
+    ContextPtr context_)
     : IStorage(table_id_)
+    , WithContext(context_->getGlobalContext())
     , source_database(source_database_)
     , source_tables(std::in_place, source_tables_.begin(), source_tables_.end())
-    , global_context(context_.getGlobalContext())
 {
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -120,11 +120,11 @@ StorageMerge::StorageMerge(
     const ColumnsDescription & columns_,
     const String & source_database_,
     const String & source_table_regexp_,
-    const Context & context_)
+    ContextPtr context_)
     : IStorage(table_id_)
+    , WithContext(context_->getGlobalContext())
     , source_database(source_database_)
     , source_table_regexp(source_table_regexp_)
-    , global_context(context_.getGlobalContext())
 {
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -134,7 +134,7 @@ StorageMerge::StorageMerge(
 template <typename F>
 StoragePtr StorageMerge::getFirstTable(F && predicate) const
 {
-    auto iterator = getDatabaseIterator(global_context);
+    auto iterator = getDatabaseIterator(getContext());
 
     while (iterator->isValid())
     {
@@ -156,11 +156,11 @@ bool StorageMerge::isRemote() const
 }
 
 
-bool StorageMerge::mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & /*metadata_snapshot*/) const
+bool StorageMerge::mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & /*metadata_snapshot*/) const
 {
     /// It's beneficial if it is true for at least one table.
     StorageListWithLocks selected_tables = getSelectedTables(
-            query_context.getCurrentQueryId(), query_context.getSettingsRef());
+            query_context->getCurrentQueryId(), query_context->getSettingsRef());
 
     size_t i = 0;
     for (const auto & table : selected_tables)
@@ -180,7 +180,8 @@ bool StorageMerge::mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, cons
 }
 
 
-QueryProcessingStage::Enum StorageMerge::getQueryProcessingStage(const Context & context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
+QueryProcessingStage::Enum
+StorageMerge::getQueryProcessingStage(ContextPtr local_context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & query_info) const
 {
     /// In case of JOIN the first stage (which includes JOIN)
     /// should be done on the initiator always.
@@ -194,7 +195,7 @@ QueryProcessingStage::Enum StorageMerge::getQueryProcessingStage(const Context &
 
     auto stage_in_source_tables = QueryProcessingStage::FetchColumns;
 
-    DatabaseTablesIteratorPtr iterator = getDatabaseIterator(context);
+    DatabaseTablesIteratorPtr iterator = getDatabaseIterator(local_context);
 
     size_t selected_table_size = 0;
 
@@ -204,7 +205,7 @@ QueryProcessingStage::Enum StorageMerge::getQueryProcessingStage(const Context &
         if (table && table.get() != this)
         {
             ++selected_table_size;
-            stage_in_source_tables = std::max(stage_in_source_tables, table->getQueryProcessingStage(context, to_stage, query_info));
+            stage_in_source_tables = std::max(stage_in_source_tables, table->getQueryProcessingStage(local_context, to_stage, query_info));
         }
 
         iterator->next();
@@ -218,7 +219,7 @@ Pipe StorageMerge::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     unsigned num_streams)
@@ -240,17 +241,17 @@ Pipe StorageMerge::read(
     /** Just in case, turn off optimization "transfer to PREWHERE",
       * since there is no certainty that it works when one of table is MergeTree and other is not.
       */
-    auto modified_context = std::make_shared<Context>(context);
+    auto modified_context = Context::createCopy(local_context);
     modified_context->setSetting("optimize_move_to_prewhere", false);
 
     /// What will be result structure depending on query processed stage in source tables?
-    Block header = getHeaderForProcessingStage(*this, column_names, metadata_snapshot, query_info, context, processed_stage);
+    Block header = getHeaderForProcessingStage(*this, column_names, metadata_snapshot, query_info, local_context, processed_stage);
 
     /** First we make list of selected tables to find out its size.
       * This is necessary to correctly pass the recommended number of threads to each table.
       */
     StorageListWithLocks selected_tables
-        = getSelectedTables(query_info, has_table_virtual_column, context.getCurrentQueryId(), context.getSettingsRef());
+        = getSelectedTables(query_info, has_table_virtual_column, local_context->getCurrentQueryId(), local_context->getSettingsRef());
 
     if (selected_tables.empty())
         /// FIXME: do we support sampling in this case?
@@ -258,7 +259,8 @@ Pipe StorageMerge::read(
             {}, query_info, processed_stage, max_block_size, header, {}, real_column_names, modified_context, 0, has_table_virtual_column);
 
     size_t tables_count = selected_tables.size();
-    Float64 num_streams_multiplier = std::min(unsigned(tables_count), std::max(1U, unsigned(context.getSettingsRef().max_streams_multiplier_for_merge_tables)));
+    Float64 num_streams_multiplier
+        = std::min(unsigned(tables_count), std::max(1U, unsigned(local_context->getSettingsRef().max_streams_multiplier_for_merge_tables)));
     num_streams *= num_streams_multiplier;
     size_t remaining_streams = num_streams;
 
@@ -269,7 +271,7 @@ Pipe StorageMerge::read(
         {
             auto storage_ptr = std::get<0>(*it);
             auto storage_metadata_snapshot = storage_ptr->getInMemoryMetadataPtr();
-            auto current_info = query_info.order_optimizer->getInputOrder(storage_metadata_snapshot, context);
+            auto current_info = query_info.order_optimizer->getInputOrder(storage_metadata_snapshot, local_context);
             if (it == selected_tables.begin())
                 input_sorting_info = current_info;
             else if (!current_info || (input_sorting_info && *current_info != *input_sorting_info))
@@ -323,7 +325,7 @@ Pipe StorageMerge::createSources(
     const Block & header,
     const StorageWithLockAndName & storage_with_lock,
     Names & real_column_names,
-    const std::shared_ptr<Context> & modified_context,
+    ContextPtr modified_context,
     size_t streams_num,
     bool has_table_virtual_column,
     bool concat_streams)
@@ -334,7 +336,7 @@ Pipe StorageMerge::createSources(
 
     /// Original query could contain JOIN but we need only the first joined table and its columns.
     auto & modified_select = modified_query_info.query->as<ASTSelectQuery &>();
-    auto new_analyzer_res = modifySelect(modified_select, *query_info.syntax_analyzer_result, *modified_context);
+    auto new_analyzer_res = modifySelect(modified_select, *query_info.syntax_analyzer_result, modified_context);
     modified_query_info.syntax_analyzer_result = std::make_shared<TreeRewriterResult>(std::move(new_analyzer_res));
 
     VirtualColumnUtils::rewriteEntityInAst(modified_query_info.query, "_table", table_name);
@@ -344,7 +346,7 @@ Pipe StorageMerge::createSources(
     if (!storage)
     {
         pipe = QueryPipeline::getPipe(InterpreterSelectQuery(
-            modified_query_info.query, *modified_context,
+            modified_query_info.query, modified_context,
             std::make_shared<OneBlockInputStream>(header),
             SelectQueryOptions(processed_stage).analyze()).execute().pipeline);
 
@@ -352,14 +354,21 @@ Pipe StorageMerge::createSources(
         return pipe;
     }
 
-    auto storage_stage = storage->getQueryProcessingStage(*modified_context, QueryProcessingStage::Complete, modified_query_info);
+    auto storage_stage = storage->getQueryProcessingStage(modified_context, QueryProcessingStage::Complete, modified_query_info);
     if (processed_stage <= storage_stage)
     {
         /// If there are only virtual columns in query, you must request at least one other column.
         if (real_column_names.empty())
             real_column_names.push_back(ExpressionActions::getSmallestColumn(metadata_snapshot->getColumns().getAllPhysical()));
 
-        pipe = storage->read(real_column_names, metadata_snapshot, modified_query_info, *modified_context, processed_stage, max_block_size, UInt32(streams_num));
+        pipe = storage->read(
+            real_column_names,
+            metadata_snapshot,
+            modified_query_info,
+            modified_context,
+            processed_stage,
+            max_block_size,
+            UInt32(streams_num));
     }
     else if (processed_stage > storage_stage)
     {
@@ -369,7 +378,7 @@ Pipe StorageMerge::createSources(
         modified_context->setSetting("max_threads", streams_num);
         modified_context->setSetting("max_streams_to_max_threads_ratio", 1);
 
-        InterpreterSelectQuery interpreter{modified_query_info.query, *modified_context, SelectQueryOptions(processed_stage)};
+        InterpreterSelectQuery interpreter{modified_query_info.query, modified_context, SelectQueryOptions(processed_stage)};
 
 
         pipe = QueryPipeline::getPipe(interpreter.execute().pipeline);
@@ -398,7 +407,7 @@ Pipe StorageMerge::createSources(
             auto adding_column_dag = ActionsDAG::makeAddingColumnActions(std::move(column));
             auto adding_column_actions = std::make_shared<ExpressionActions>(
                 std::move(adding_column_dag),
-                ExpressionActionsSettings::fromContext(*modified_context));
+                ExpressionActionsSettings::fromContext(modified_context));
 
             pipe.addSimpleTransform([&](const Block & stream_header)
             {
@@ -408,7 +417,7 @@ Pipe StorageMerge::createSources(
 
         /// Subordinary tables could have different but convertible types, like numeric types of different width.
         /// We must return streams with structure equals to structure of Merge table.
-        convertingSourceStream(header, metadata_snapshot, *modified_context, modified_query_info.query, pipe, processed_stage);
+        convertingSourceStream(header, metadata_snapshot, modified_context, modified_query_info.query, pipe, processed_stage);
 
         pipe.addTableLock(struct_lock);
         pipe.addStorageHolder(storage);
@@ -422,7 +431,7 @@ Pipe StorageMerge::createSources(
 StorageMerge::StorageListWithLocks StorageMerge::getSelectedTables(const String & query_id, const Settings & settings) const
 {
     StorageListWithLocks selected_tables;
-    auto iterator = getDatabaseIterator(global_context);
+    auto iterator = getDatabaseIterator(getContext());
 
     while (iterator->isValid())
     {
@@ -443,7 +452,7 @@ StorageMerge::StorageListWithLocks StorageMerge::getSelectedTables(
 {
     const ASTPtr & query = query_info.query;
     StorageListWithLocks selected_tables;
-    DatabaseTablesIteratorPtr iterator = getDatabaseIterator(global_context);
+    DatabaseTablesIteratorPtr iterator = getDatabaseIterator(getContext());
 
     auto virtual_column = ColumnString::create();
 
@@ -469,7 +478,7 @@ StorageMerge::StorageListWithLocks StorageMerge::getSelectedTables(
     if (has_virtual_column)
     {
         Block virtual_columns_block = Block{ColumnWithTypeAndName(std::move(virtual_column), std::make_shared<DataTypeString>(), "_table")};
-        VirtualColumnUtils::filterBlockWithQuery(query_info.query, virtual_columns_block, global_context);
+        VirtualColumnUtils::filterBlockWithQuery(query_info.query, virtual_columns_block, getContext());
         auto values = VirtualColumnUtils::extractSingleValueFromBlock<String>(virtual_columns_block, "_table");
 
         /// Remove unused tables from the list
@@ -480,7 +489,7 @@ StorageMerge::StorageListWithLocks StorageMerge::getSelectedTables(
 }
 
 
-DatabaseTablesIteratorPtr StorageMerge::getDatabaseIterator(const Context & context) const
+DatabaseTablesIteratorPtr StorageMerge::getDatabaseIterator(ContextPtr local_context) const
 {
     try
     {
@@ -502,13 +511,13 @@ DatabaseTablesIteratorPtr StorageMerge::getDatabaseIterator(const Context & cont
             return source_table_regexp->match(table_name_);
     };
 
-    return database->getTablesIterator(context, table_name_match);
+    return database->getTablesIterator(local_context, table_name_match);
 }
 
 
-void StorageMerge::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void StorageMerge::checkAlterIsPossible(const AlterCommands & commands, ContextPtr local_context) const
 {
-    auto name_deps = getDependentViewsByColumn(context);
+    auto name_deps = getDependentViewsByColumn(local_context);
     for (const auto & command : commands)
     {
         if (command.type != AlterCommand::Type::ADD_COLUMN && command.type != AlterCommand::Type::MODIFY_COLUMN
@@ -531,20 +540,20 @@ void StorageMerge::checkAlterIsPossible(const AlterCommands & commands, const Co
 }
 
 void StorageMerge::alter(
-    const AlterCommands & params, const Context & context, TableLockHolder &)
+    const AlterCommands & params, ContextPtr local_context, TableLockHolder &)
 {
     auto table_id = getStorageID();
 
     StorageInMemoryMetadata storage_metadata = getInMemoryMetadata();
-    params.apply(storage_metadata, context);
-    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, storage_metadata);
+    params.apply(storage_metadata, local_context);
+    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, storage_metadata);
     setInMemoryMetadata(storage_metadata);
 }
 
 void StorageMerge::convertingSourceStream(
     const Block & header,
     const StorageMetadataPtr & metadata_snapshot,
-    const Context & context,
+    ContextPtr local_context,
     ASTPtr & query,
     Pipe & pipe,
     QueryProcessingStage::Enum processed_stage)
@@ -555,7 +564,7 @@ void StorageMerge::convertingSourceStream(
             pipe.getHeader().getColumnsWithTypeAndName(),
             header.getColumnsWithTypeAndName(),
             ActionsDAG::MatchColumnsMode::Name);
-    auto convert_actions = std::make_shared<ExpressionActions>(convert_actions_dag, ExpressionActionsSettings::fromContext(context));
+    auto convert_actions = std::make_shared<ExpressionActions>(convert_actions_dag, ExpressionActionsSettings::fromContext(local_context));
 
     pipe.addSimpleTransform([&](const Block & stream_header)
     {
@@ -579,8 +588,8 @@ void StorageMerge::convertingSourceStream(
             NamesAndTypesList source_columns = metadata_snapshot->getSampleBlock().getNamesAndTypesList();
             auto virtual_column = *getVirtuals().tryGetByName("_table");
             source_columns.emplace_back(NameAndTypePair{virtual_column.name, virtual_column.type});
-            auto syntax_result = TreeRewriter(context).analyze(where_expression, source_columns);
-            ExpressionActionsPtr actions = ExpressionAnalyzer{where_expression, syntax_result, context}.getActions(false, false);
+            auto syntax_result = TreeRewriter(local_context).analyze(where_expression, source_columns);
+            ExpressionActionsPtr actions = ExpressionAnalyzer{where_expression, syntax_result, local_context}.getActions(false, false);
             Names required_columns = actions->getRequiredColumns();
 
             for (const auto & required_column : required_columns)
@@ -617,15 +626,15 @@ void registerStorageMerge(StorageFactory & factory)
                 " - name of source database and regexp for table names.",
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
-        engine_args[0] = evaluateConstantExpressionForDatabaseName(engine_args[0], args.local_context);
-        engine_args[1] = evaluateConstantExpressionAsLiteral(engine_args[1], args.local_context);
+        engine_args[0] = evaluateConstantExpressionForDatabaseName(engine_args[0], args.getLocalContext());
+        engine_args[1] = evaluateConstantExpressionAsLiteral(engine_args[1], args.getLocalContext());
 
         String source_database = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
         String table_name_regexp = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
 
         return StorageMerge::create(
             args.table_id, args.columns,
-            source_database, table_name_regexp, args.context);
+            source_database, table_name_regexp, args.getContext());
     });
 }
 
diff --git a/src/Storages/StorageMerge.h b/src/Storages/StorageMerge.h
index ea8667aa186..a1d5c7fd02d 100644
--- a/src/Storages/StorageMerge.h
+++ b/src/Storages/StorageMerge.h
@@ -12,7 +12,7 @@ namespace DB
 /** A table that represents the union of an arbitrary number of other tables.
   * All tables must have the same structure.
   */
-class StorageMerge final : public ext::shared_ptr_helper<StorageMerge>, public IStorage
+class StorageMerge final : public ext::shared_ptr_helper<StorageMerge>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageMerge>;
 public:
@@ -27,31 +27,30 @@ public:
     bool supportsIndexForIn() const override { return true; }
     bool supportsSubcolumns() const override { return true; }
 
-    QueryProcessingStage::Enum getQueryProcessingStage(const Context &, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
+    QueryProcessingStage::Enum getQueryProcessingStage(ContextPtr, QueryProcessingStage::Enum /*to_stage*/, SelectQueryInfo &) const override;
 
     Pipe read(
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
     /// you need to add and remove columns in the sub-tables manually
     /// the structure of sub-tables is not checked
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     bool mayBenefitFromIndexForIn(
-        const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & metadata_snapshot) const override;
+        const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & metadata_snapshot) const override;
 
 private:
     String source_database;
     std::optional<std::unordered_set<String>> source_tables;
     std::optional<OptimizedRegularExpression> source_table_regexp;
-    const Context & global_context;
 
     using StorageWithLockAndName = std::tuple<StoragePtr, TableLockHolder, String>;
     using StorageListWithLocks = std::list<StorageWithLockAndName>;
@@ -64,7 +63,7 @@ private:
     template <typename F>
     StoragePtr getFirstTable(F && predicate) const;
 
-    DatabaseTablesIteratorPtr getDatabaseIterator(const Context & context) const;
+    DatabaseTablesIteratorPtr getDatabaseIterator(ContextPtr context) const;
 
     NamesAndTypesList getVirtuals() const override;
     ColumnSizeByName getColumnSizes() const override;
@@ -75,31 +74,31 @@ protected:
         const ColumnsDescription & columns_,
         const String & source_database_,
         const Strings & source_tables_,
-        const Context & context_);
+        ContextPtr context_);
 
     StorageMerge(
         const StorageID & table_id_,
         const ColumnsDescription & columns_,
         const String & source_database_,
         const String & source_table_regexp_,
-        const Context & context_);
+        ContextPtr context_);
 
     Pipe createSources(
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
         const QueryProcessingStage::Enum & processed_stage,
-        const UInt64 max_block_size,
+        UInt64 max_block_size,
         const Block & header,
         const StorageWithLockAndName & storage_with_lock,
         Names & real_column_names,
-        const std::shared_ptr<Context> & modified_context,
+        ContextPtr modified_context,
         size_t streams_num,
         bool has_table_virtual_column,
         bool concat_streams = false);
 
     void convertingSourceStream(
         const Block & header, const StorageMetadataPtr & metadata_snapshot,
-        const Context & context, ASTPtr & query,
+        ContextPtr context, ASTPtr & query,
         Pipe & pipe, QueryProcessingStage::Enum processed_stage);
 };
 
diff --git a/src/Storages/StorageMergeTree.cpp b/src/Storages/StorageMergeTree.cpp
index eeb8df4d329..4d7f7d8c887 100644
--- a/src/Storages/StorageMergeTree.cpp
+++ b/src/Storages/StorageMergeTree.cpp
@@ -63,7 +63,7 @@ StorageMergeTree::StorageMergeTree(
     const String & relative_data_path_,
     const StorageInMemoryMetadata & metadata_,
     bool attach,
-    Context & context_,
+    ContextPtr context_,
     const String & date_column_name,
     const MergingParams & merging_params_,
     std::unique_ptr<MergeTreeSettings> storage_settings_,
@@ -80,9 +80,9 @@ StorageMergeTree::StorageMergeTree(
         attach)
     , reader(*this)
     , writer(*this)
-    , merger_mutator(*this, global_context.getSettingsRef().background_pool_size)
-    , background_executor(*this, global_context)
-    , background_moves_executor(*this, global_context)
+    , merger_mutator(*this, getContext()->getSettingsRef().background_pool_size)
+    , background_executor(*this, getContext())
+    , background_moves_executor(*this, getContext())
 
 {
     loadDataParts(has_force_restore_data_flag);
@@ -182,12 +182,12 @@ void StorageMergeTree::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
 {
-    if (auto plan = reader.read(column_names, metadata_snapshot, query_info, context, max_block_size, num_streams))
+    if (auto plan = reader.read(column_names, metadata_snapshot, query_info, local_context, max_block_size, num_streams))
         query_plan = std::move(*plan);
 }
 
@@ -195,16 +195,16 @@ Pipe StorageMergeTree::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     QueryPlan plan;
-    read(plan, column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    read(plan, column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
     return plan.convertToPipe(
-        QueryPlanOptimizationSettings::fromContext(context),
-        BuildQueryPipelineSettings::fromContext(context));
+        QueryPlanOptimizationSettings::fromContext(local_context),
+        BuildQueryPipelineSettings::fromContext(local_context));
 }
 
 std::optional<UInt64> StorageMergeTree::totalRows(const Settings &) const
@@ -212,10 +212,10 @@ std::optional<UInt64> StorageMergeTree::totalRows(const Settings &) const
     return getTotalActiveSizeInRows();
 }
 
-std::optional<UInt64> StorageMergeTree::totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, const Context & context) const
+std::optional<UInt64> StorageMergeTree::totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, ContextPtr local_context) const
 {
     auto parts = getDataPartsVector({DataPartState::Committed});
-    return totalRowsByPartitionPredicateImpl(query_info, context, parts);
+    return totalRowsByPartitionPredicateImpl(query_info, local_context, parts);
 }
 
 std::optional<UInt64> StorageMergeTree::totalBytes(const Settings &) const
@@ -223,18 +223,18 @@ std::optional<UInt64> StorageMergeTree::totalBytes(const Settings &) const
     return getTotalActiveSizeInBytes();
 }
 
-BlockOutputStreamPtr StorageMergeTree::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr
+StorageMergeTree::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
-
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = local_context->getSettingsRef();
     return std::make_shared<MergeTreeBlockOutputStream>(
-        *this, metadata_snapshot, settings.max_partitions_per_insert_block, context.getSettingsRef().optimize_on_insert);
+        *this, metadata_snapshot, settings.max_partitions_per_insert_block, local_context->getSettingsRef().optimize_on_insert);
 }
 
 void StorageMergeTree::checkTableCanBeDropped() const
 {
     auto table_id = getStorageID();
-    global_context.checkTableCanBeDropped(table_id.database_name, table_id.table_name, getTotalActiveSizeInBytes());
+    getContext()->checkTableCanBeDropped(table_id.database_name, table_id.table_name, getTotalActiveSizeInBytes());
 }
 
 void StorageMergeTree::drop()
@@ -243,7 +243,7 @@ void StorageMergeTree::drop()
     dropAllData();
 }
 
-void StorageMergeTree::truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &)
+void StorageMergeTree::truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &)
 {
     {
         /// Asks to complete merges and does not allow them to start.
@@ -263,7 +263,7 @@ void StorageMergeTree::truncate(const ASTPtr &, const StorageMetadataPtr &, cons
 
 void StorageMergeTree::alter(
     const AlterCommands & commands,
-    const Context & context,
+    ContextPtr local_context,
     TableLockHolder & table_lock_holder)
 {
     auto table_id = getStorageID();
@@ -271,17 +271,17 @@ void StorageMergeTree::alter(
 
     StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
     StorageInMemoryMetadata old_metadata = getInMemoryMetadata();
-    auto maybe_mutation_commands = commands.getMutationCommands(new_metadata, context.getSettingsRef().materialize_ttl_after_modify, context);
+    auto maybe_mutation_commands = commands.getMutationCommands(new_metadata, local_context->getSettingsRef().materialize_ttl_after_modify, local_context);
     String mutation_file_name;
     Int64 mutation_version = -1;
-    commands.apply(new_metadata, context);
+    commands.apply(new_metadata, local_context);
 
     /// This alter can be performed at new_metadata level only
     if (commands.isSettingsAlter())
     {
         changeSettings(new_metadata.settings_changes, table_lock_holder);
 
-        DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
+        DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
     }
     else
     {
@@ -291,7 +291,7 @@ void StorageMergeTree::alter(
             /// Reinitialize primary key because primary key column types might have changed.
             setProperties(new_metadata, old_metadata);
 
-            DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
+            DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
 
             if (!maybe_mutation_commands.empty())
                 mutation_version = startMutation(maybe_mutation_commands, mutation_file_name);
@@ -479,12 +479,12 @@ void StorageMergeTree::waitForMutation(Int64 version, const String & file_name)
     LOG_INFO(log, "Mutation {} done", file_name);
 }
 
-void StorageMergeTree::mutate(const MutationCommands & commands, const Context & query_context)
+void StorageMergeTree::mutate(const MutationCommands & commands, ContextPtr query_context)
 {
     String mutation_file_name;
     Int64 version = startMutation(commands, mutation_file_name);
 
-    if (query_context.getSettingsRef().mutations_sync > 0)
+    if (query_context->getSettingsRef().mutations_sync > 0)
         waitForMutation(version, mutation_file_name);
 }
 
@@ -618,7 +618,7 @@ CancellationCode StorageMergeTree::killMutation(const String & mutation_id)
     if (!to_kill)
         return CancellationCode::NotFound;
 
-    global_context.getMergeList().cancelPartMutations({}, to_kill->block_number);
+    getContext()->getMergeList().cancelPartMutations({}, to_kill->block_number);
     to_kill->removeFile();
     LOG_TRACE(log, "Cancelled part mutations and removed mutation file {}", mutation_id);
     {
@@ -768,7 +768,7 @@ std::shared_ptr<StorageMergeTree::MergeMutateSelectedEntry> StorageMergeTree::se
 
     /// Account TTL merge here to avoid exceeding the max_number_of_merges_with_ttl_in_pool limit
     if (isTTLMergeType(future_part.merge_type))
-        global_context.getMergeList().bookMergeWithTTL();
+        getContext()->getMergeList().bookMergeWithTTL();
 
     merging_tagger = std::make_unique<CurrentlyMergingPartsTagger>(future_part, MergeTreeDataMergerMutator::estimateNeededDiskSpace(future_part.parts), *this, metadata_snapshot, false);
     return std::make_shared<MergeMutateSelectedEntry>(future_part, std::move(merging_tagger), MutationCommands{});
@@ -812,7 +812,7 @@ bool StorageMergeTree::mergeSelectedParts(
     MutableDataPartPtr new_part;
     auto table_id = getStorageID();
 
-    auto merge_list_entry = global_context.getMergeList().insert(table_id.database_name, table_id.table_name, future_part);
+    auto merge_list_entry = getContext()->getMergeList().insert(table_id.database_name, table_id.table_name, future_part);
 
     auto write_part_log = [&] (const ExecutionStatus & execution_status)
     {
@@ -830,7 +830,7 @@ bool StorageMergeTree::mergeSelectedParts(
     {
         new_part = merger_mutator.mergePartsToTemporaryPart(
             future_part, metadata_snapshot, *(merge_list_entry), table_lock_holder, time(nullptr),
-            global_context, merge_mutate_entry.tagger->reserved_space, deduplicate, deduplicate_by_columns);
+            getContext(), merge_mutate_entry.tagger->reserved_space, deduplicate, deduplicate_by_columns);
 
         merger_mutator.renameMergedTemporaryPart(new_part, future_part.parts, nullptr);
         write_part_log({});
@@ -854,7 +854,7 @@ std::shared_ptr<StorageMergeTree::MergeMutateSelectedEntry> StorageMergeTree::se
     const StorageMetadataPtr & metadata_snapshot, String * /* disable_reason */, TableLockHolder & /* table_lock_holder */)
 {
     std::lock_guard lock(currently_processing_in_background_mutex);
-    size_t max_ast_elements = global_context.getSettingsRef().max_expanded_ast_elements;
+    size_t max_ast_elements = getContext()->getSettingsRef().max_expanded_ast_elements;
 
     FutureMergedMutatedPart future_part;
     if (storage_settings.get()->assign_part_uuids)
@@ -909,7 +909,7 @@ std::shared_ptr<StorageMergeTree::MergeMutateSelectedEntry> StorageMergeTree::se
             if (!commands_for_size_validation.empty())
             {
                 MutationsInterpreter interpreter(
-                    shared_from_this(), metadata_snapshot, commands_for_size_validation, global_context, false);
+                    shared_from_this(), metadata_snapshot, commands_for_size_validation, getContext(), false);
                 commands_size += interpreter.evaluateCommandsSize();
             }
 
@@ -939,7 +939,7 @@ bool StorageMergeTree::mutateSelectedPart(const StorageMetadataPtr & metadata_sn
     auto & future_part = merge_mutate_entry.future_part;
     auto table_id = getStorageID();
 
-    auto merge_list_entry = global_context.getMergeList().insert(table_id.database_name, table_id.table_name, future_part);
+    auto merge_list_entry = getContext()->getMergeList().insert(table_id.database_name, table_id.table_name, future_part);
     Stopwatch stopwatch;
     MutableDataPartPtr new_part;
 
@@ -959,7 +959,7 @@ bool StorageMergeTree::mutateSelectedPart(const StorageMetadataPtr & metadata_sn
     {
         new_part = merger_mutator.mutatePartToTemporaryPart(
             future_part, metadata_snapshot, merge_mutate_entry.commands, *(merge_list_entry),
-            time(nullptr), global_context, merge_mutate_entry.tagger->reserved_space, table_lock_holder);
+            time(nullptr), getContext(), merge_mutate_entry.tagger->reserved_space, table_lock_holder);
 
         renameTempPartAndReplace(new_part);
 
@@ -1084,7 +1084,7 @@ bool StorageMergeTree::optimize(
     bool final,
     bool deduplicate,
     const Names & deduplicate_by_columns,
-    const Context & context)
+    ContextPtr local_context)
 {
     if (deduplicate)
     {
@@ -1105,14 +1105,21 @@ bool StorageMergeTree::optimize(
 
         for (const String & partition_id : partition_ids)
         {
-            if (!merge(true, partition_id, true, deduplicate, deduplicate_by_columns, &disable_reason, context.getSettingsRef().optimize_skip_merged_partitions))
+            if (!merge(
+                    true,
+                    partition_id,
+                    true,
+                    deduplicate,
+                    deduplicate_by_columns,
+                    &disable_reason,
+                    local_context->getSettingsRef().optimize_skip_merged_partitions))
             {
                 constexpr const char * message = "Cannot OPTIMIZE table: {}";
                 if (disable_reason.empty())
                     disable_reason = "unknown reason";
                 LOG_INFO(log, message, disable_reason);
 
-                if (context.getSettingsRef().optimize_throw_if_noop)
+                if (local_context->getSettingsRef().optimize_throw_if_noop)
                     throw Exception(ErrorCodes::CANNOT_ASSIGN_OPTIMIZE, message, disable_reason);
                 return false;
             }
@@ -1122,16 +1129,23 @@ bool StorageMergeTree::optimize(
     {
         String partition_id;
         if (partition)
-            partition_id = getPartitionIDFromQuery(partition, context);
+            partition_id = getPartitionIDFromQuery(partition, local_context);
 
-        if (!merge(true, partition_id, final, deduplicate, deduplicate_by_columns, &disable_reason, context.getSettingsRef().optimize_skip_merged_partitions))
+        if (!merge(
+                true,
+                partition_id,
+                final,
+                deduplicate,
+                deduplicate_by_columns,
+                &disable_reason,
+                local_context->getSettingsRef().optimize_skip_merged_partitions))
         {
             constexpr const char * message = "Cannot OPTIMIZE table: {}";
             if (disable_reason.empty())
                 disable_reason = "unknown reason";
             LOG_INFO(log, message, disable_reason);
 
-            if (context.getSettingsRef().optimize_throw_if_noop)
+            if (local_context->getSettingsRef().optimize_throw_if_noop)
                 throw Exception(ErrorCodes::CANNOT_ASSIGN_OPTIMIZE, message, disable_reason);
             return false;
         }
@@ -1199,7 +1213,7 @@ MergeTreeDataPartPtr StorageMergeTree::outdatePart(const String & part_name, boo
     }
 }
 
-void StorageMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool drop_part, const Context & context, bool throw_if_noop)
+void StorageMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool drop_part, ContextPtr local_context, bool throw_if_noop)
 {
     {
         MergeTreeData::DataPartsVector parts_to_remove;
@@ -1219,7 +1233,7 @@ void StorageMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool
             /// Asks to complete merges and does not allow them to start.
             /// This protects against "revival" of data for a removed partition after completion of merge.
             auto merge_blocker = stopMergesAndWait();
-            String partition_id = getPartitionIDFromQuery(partition, context);
+            String partition_id = getPartitionIDFromQuery(partition, local_context);
             parts_to_remove = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
 
             /// TODO should we throw an exception if parts_to_remove is empty?
@@ -1255,11 +1269,11 @@ void StorageMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool
 
 PartitionCommandsResultInfo StorageMergeTree::attachPartition(
     const ASTPtr & partition, const StorageMetadataPtr & /* metadata_snapshot */,
-    bool attach_part, const Context & context)
+    bool attach_part, ContextPtr local_context)
 {
     PartitionCommandsResultInfo results;
     PartsTemporaryRename renamed_parts(*this, "detached/");
-    MutableDataPartsVector loaded_parts = tryLoadPartsToAttach(partition, attach_part, context, renamed_parts);
+    MutableDataPartsVector loaded_parts = tryLoadPartsToAttach(partition, attach_part, local_context, renamed_parts);
 
     for (size_t i = 0; i < loaded_parts.size(); ++i)
     {
@@ -1278,20 +1292,20 @@ PartitionCommandsResultInfo StorageMergeTree::attachPartition(
     }
 
     /// New parts with other data may appear in place of deleted parts.
-    context.dropCaches();
+    local_context->dropCaches();
     return results;
 }
 
-void StorageMergeTree::replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & context)
+void StorageMergeTree::replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr local_context)
 {
-    auto lock1 = lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
-    auto lock2 = source_table->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock1 = lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
+    auto lock2 = source_table->lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
     auto source_metadata_snapshot = source_table->getInMemoryMetadataPtr();
     auto my_metadata_snapshot = getInMemoryMetadataPtr();
 
     Stopwatch watch;
     MergeTreeData & src_data = checkStructureAndGetMergeTreeData(source_table, source_metadata_snapshot, my_metadata_snapshot);
-    String partition_id = getPartitionIDFromQuery(partition, context);
+    String partition_id = getPartitionIDFromQuery(partition, local_context);
 
     DataPartsVector src_parts = src_data.getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
     MutableDataPartsVector dst_parts;
@@ -1346,19 +1360,19 @@ void StorageMergeTree::replacePartitionFrom(const StoragePtr & source_table, con
                 removePartsInRangeFromWorkingSet(drop_range, true, false, data_parts_lock);
         }
 
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
         throw;
     }
 }
 
-void StorageMergeTree::movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & context)
+void StorageMergeTree::movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr local_context)
 {
-    auto lock1 = lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
-    auto lock2 = dest_table->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock1 = lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
+    auto lock2 = dest_table->lockForShare(local_context->getCurrentQueryId(), local_context->getSettingsRef().lock_acquire_timeout);
 
     auto dest_table_storage = std::dynamic_pointer_cast<StorageMergeTree>(dest_table);
     if (!dest_table_storage)
@@ -1375,7 +1389,7 @@ void StorageMergeTree::movePartitionToTable(const StoragePtr & dest_table, const
     Stopwatch watch;
 
     MergeTreeData & src_data = dest_table_storage->checkStructureAndGetMergeTreeData(*this, metadata_snapshot, dest_metadata_snapshot);
-    String partition_id = getPartitionIDFromQuery(partition, context);
+    String partition_id = getPartitionIDFromQuery(partition, local_context);
 
     DataPartsVector src_parts = src_data.getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
     MutableDataPartsVector dst_parts;
@@ -1422,11 +1436,11 @@ void StorageMergeTree::movePartitionToTable(const StoragePtr & dest_table, const
         clearOldMutations(true);
         clearOldPartsFromFilesystem();
 
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
         throw;
     }
 }
@@ -1451,13 +1465,13 @@ void StorageMergeTree::onActionLockRemove(StorageActionBlockType action_type)
         background_moves_executor.triggerTask();
 }
 
-CheckResults StorageMergeTree::checkData(const ASTPtr & query, const Context & context)
+CheckResults StorageMergeTree::checkData(const ASTPtr & query, ContextPtr local_context)
 {
     CheckResults results;
     DataPartsVector data_parts;
     if (const auto & check_query = query->as<ASTCheckQuery &>(); check_query.partition)
     {
-        String partition_id = getPartitionIDFromQuery(check_query.partition, context);
+        String partition_id = getPartitionIDFromQuery(check_query.partition, local_context);
         data_parts = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
     }
     else
diff --git a/src/Storages/StorageMergeTree.h b/src/Storages/StorageMergeTree.h
index 1ae21608190..2a50cb33912 100644
--- a/src/Storages/StorageMergeTree.h
+++ b/src/Storages/StorageMergeTree.h
@@ -42,7 +42,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -52,16 +52,16 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
     std::optional<UInt64> totalRows(const Settings &) const override;
-    std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo &, const Context &) const override;
+    std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo &, ContextPtr) const override;
     std::optional<UInt64> totalBytes(const Settings &) const override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     /** Perform the next step in combining the parts.
       */
@@ -72,9 +72,9 @@ public:
         bool final,
         bool deduplicate,
         const Names & deduplicate_by_columns,
-        const Context & context) override;
+        ContextPtr context) override;
 
-    void mutate(const MutationCommands & commands, const Context & context) override;
+    void mutate(const MutationCommands & commands, ContextPtr context) override;
 
     /// Return introspection information about currently processing or recently processed mutations.
     std::vector<MergeTreeMutationStatus> getMutationsStatus() const override;
@@ -82,9 +82,9 @@ public:
     CancellationCode killMutation(const String & mutation_id) override;
 
     void drop() override;
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &) override;
 
-    void alter(const AlterCommands & commands, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & commands, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     void checkTableCanBeDropped() const override;
 
@@ -92,7 +92,7 @@ public:
 
     void onActionLockRemove(StorageActionBlockType action_type) override;
 
-    CheckResults checkData(const ASTPtr & query, const Context & context) override;
+    CheckResults checkData(const ASTPtr & query, ContextPtr context) override;
 
     std::optional<JobAndPool> getDataProcessingJob() override;
 
@@ -211,11 +211,11 @@ private:
     void clearOldMutations(bool truncate = false);
 
     // Partition helpers
-    void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, const Context & context, bool throw_if_noop) override;
-    PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, const Context & context) override;
+    void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, ContextPtr context, bool throw_if_noop) override;
+    PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, ContextPtr context) override;
 
-    void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & context) override;
-    void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & context) override;
+    void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr context) override;
+    void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr context) override;
     bool partIsAssignedToBackgroundOperation(const DataPartPtr & part) const override;
     /// Update mutation entries after part mutation execution. May reset old
     /// errors if mutation was successful. Otherwise update last_failed* fields
@@ -249,7 +249,7 @@ protected:
         const String & relative_data_path_,
         const StorageInMemoryMetadata & metadata,
         bool attach,
-        Context & context_,
+        ContextPtr context_,
         const String & date_column_name,
         const MergingParams & merging_params_,
         std::unique_ptr<MergeTreeSettings> settings_,
diff --git a/src/Storages/StorageMongoDB.cpp b/src/Storages/StorageMongoDB.cpp
index 09fd413af75..2b0200f3643 100644
--- a/src/Storages/StorageMongoDB.cpp
+++ b/src/Storages/StorageMongoDB.cpp
@@ -74,7 +74,7 @@ Pipe StorageMongoDB::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned)
@@ -106,7 +106,7 @@ void registerStorageMongoDB(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         for (auto & engine_arg : engine_args)
-            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.local_context);
+            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
 
         /// 27017 is the default MongoDB port.
         auto parsed_host_port = parseAddress(engine_args[0]->as<ASTLiteral &>().value.safeGet<String>(), 27017);
diff --git a/src/Storages/StorageMongoDB.h b/src/Storages/StorageMongoDB.h
index 589ab276539..5e96d1543a2 100644
--- a/src/Storages/StorageMongoDB.h
+++ b/src/Storages/StorageMongoDB.h
@@ -35,7 +35,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageMySQL.cpp b/src/Storages/StorageMySQL.cpp
index 66f6b374339..c635b0e939c 100644
--- a/src/Storages/StorageMySQL.cpp
+++ b/src/Storages/StorageMySQL.cpp
@@ -49,14 +49,14 @@ StorageMySQL::StorageMySQL(
     const std::string & on_duplicate_clause_,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    const Context & context_)
+    ContextPtr context_)
     : IStorage(table_id_)
+    , WithContext(context_->getGlobalContext())
     , remote_database_name(remote_database_name_)
     , remote_table_name(remote_table_name_)
     , replace_query{replace_query_}
     , on_duplicate_clause{on_duplicate_clause_}
     , pool(std::make_shared<mysqlxx::PoolWithFailover>(pool_))
-    , global_context(context_.getGlobalContext())
 {
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
@@ -69,7 +69,7 @@ Pipe StorageMySQL::read(
     const Names & column_names_,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info_,
-    const Context & context_,
+    ContextPtr context_,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size_,
     unsigned)
@@ -147,7 +147,7 @@ public:
         sqlbuf << backQuoteMySQL(remote_database_name) << "." << backQuoteMySQL(remote_table_name);
         sqlbuf << " (" << dumpNamesWithBackQuote(block) << ") VALUES ";
 
-        auto writer = FormatFactory::instance().getOutputStream("Values", sqlbuf, metadata_snapshot->getSampleBlock(), storage.global_context);
+        auto writer = FormatFactory::instance().getOutputStream("Values", sqlbuf, metadata_snapshot->getSampleBlock(), storage.getContext());
         writer->write(block);
 
         if (!storage.on_duplicate_clause.empty())
@@ -211,9 +211,15 @@ private:
 };
 
 
-BlockOutputStreamPtr StorageMySQL::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageMySQL::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
-    return std::make_shared<StorageMySQLBlockOutputStream>(*this, metadata_snapshot, remote_database_name, remote_table_name, pool->get(), context.getSettingsRef().mysql_max_rows_to_insert);
+    return std::make_shared<StorageMySQLBlockOutputStream>(
+        *this,
+        metadata_snapshot,
+        remote_database_name,
+        remote_table_name,
+        pool->get(),
+        local_context->getSettingsRef().mysql_max_rows_to_insert);
 }
 
 void registerStorageMySQL(StorageFactory & factory)
@@ -228,7 +234,7 @@ void registerStorageMySQL(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         for (auto & engine_arg : engine_args)
-            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.local_context);
+            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
 
         /// 3306 is the default MySQL port.
         const String & host_port = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
@@ -236,7 +242,7 @@ void registerStorageMySQL(StorageFactory & factory)
         const String & remote_table = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
         const String & username = engine_args[3]->as<ASTLiteral &>().value.safeGet<String>();
         const String & password = engine_args[4]->as<ASTLiteral &>().value.safeGet<String>();
-        size_t max_addresses = args.context.getSettingsRef().glob_expansion_max_elements;
+        size_t max_addresses = args.getContext()->getSettingsRef().glob_expansion_max_elements;
 
         auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 3306);
         mysqlxx::PoolWithFailover pool(remote_database, addresses, username, password);
@@ -262,7 +268,7 @@ void registerStorageMySQL(StorageFactory & factory)
             on_duplicate_clause,
             args.columns,
             args.constraints,
-            args.context);
+            args.getContext());
     },
     {
         .source_access_type = AccessType::MYSQL,
diff --git a/src/Storages/StorageMySQL.h b/src/Storages/StorageMySQL.h
index 1ebcb0626ae..a68c06c1abe 100644
--- a/src/Storages/StorageMySQL.h
+++ b/src/Storages/StorageMySQL.h
@@ -19,7 +19,7 @@ namespace DB
   * Use ENGINE = mysql(host_port, database_name, table_name, user_name, password)
   * Read only.
   */
-class StorageMySQL final : public ext::shared_ptr_helper<StorageMySQL>, public IStorage
+class StorageMySQL final : public ext::shared_ptr_helper<StorageMySQL>, public IStorage, WithContext
 {
     friend struct ext::shared_ptr_helper<StorageMySQL>;
 public:
@@ -28,11 +28,11 @@ public:
         mysqlxx::PoolWithFailover && pool_,
         const std::string & remote_database_name_,
         const std::string & remote_table_name_,
-        const bool replace_query_,
+        bool replace_query_,
         const std::string & on_duplicate_clause_,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        const Context & context_);
+        ContextPtr context_);
 
     std::string getName() const override { return "MySQL"; }
 
@@ -40,12 +40,12 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
 private:
     friend class StorageMySQLBlockOutputStream;
@@ -56,7 +56,6 @@ private:
     std::string on_duplicate_clause;
 
     mysqlxx::PoolWithFailoverPtr pool;
-    const Context & global_context;
 };
 
 }
diff --git a/src/Storages/StorageNull.cpp b/src/Storages/StorageNull.cpp
index ed9a7fffc63..46f88bbc7ac 100644
--- a/src/Storages/StorageNull.cpp
+++ b/src/Storages/StorageNull.cpp
@@ -36,7 +36,7 @@ void registerStorageNull(StorageFactory & factory)
     });
 }
 
-void StorageNull::checkAlterIsPossible(const AlterCommands & commands, const Context & context) const
+void StorageNull::checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const
 {
     auto name_deps = getDependentViewsByColumn(context);
     for (const auto & command : commands)
@@ -61,7 +61,7 @@ void StorageNull::checkAlterIsPossible(const AlterCommands & commands, const Con
 }
 
 
-void StorageNull::alter(const AlterCommands & params, const Context & context, TableLockHolder &)
+void StorageNull::alter(const AlterCommands & params, ContextPtr context, TableLockHolder &)
 {
     auto table_id = getStorageID();
 
diff --git a/src/Storages/StorageNull.h b/src/Storages/StorageNull.h
index 943c056a588..7fe65eb25dc 100644
--- a/src/Storages/StorageNull.h
+++ b/src/Storages/StorageNull.h
@@ -25,7 +25,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo &,
-        const Context & /*context*/,
+        ContextPtr /*context*/,
         QueryProcessingStage::Enum /*processing_stage*/,
         size_t,
         unsigned) override
@@ -36,14 +36,14 @@ public:
 
     bool supportsParallelInsert() const override { return true; }
 
-    BlockOutputStreamPtr write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &) override
+    BlockOutputStreamPtr write(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr) override
     {
         return std::make_shared<NullBlockOutputStream>(metadata_snapshot->getSampleBlock());
     }
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override;
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override;
 
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & table_lock_holder) override;
 
     std::optional<UInt64> totalRows(const Settings &) const override
     {
diff --git a/src/Storages/StoragePostgreSQL.cpp b/src/Storages/StoragePostgreSQL.cpp
index d630cb26342..a99568c0036 100644
--- a/src/Storages/StoragePostgreSQL.cpp
+++ b/src/Storages/StoragePostgreSQL.cpp
@@ -46,7 +46,7 @@ StoragePostgreSQL::StoragePostgreSQL(
     const String & remote_table_name_,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    const Context & context_,
+    ContextPtr context_,
     const String & remote_table_schema_)
     : IStorage(table_id_)
     , remote_table_name(remote_table_name_)
@@ -65,7 +65,7 @@ Pipe StoragePostgreSQL::read(
     const Names & column_names_,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info_,
-    const Context & context_,
+    ContextPtr context_,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size_,
     unsigned)
@@ -286,7 +286,7 @@ private:
 
 
 BlockOutputStreamPtr StoragePostgreSQL::write(
-        const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /* context */)
+        const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /* context */)
 {
     return std::make_shared<PostgreSQLBlockOutputStream>(metadata_snapshot, pool->get(), remote_table_name);
 }
@@ -304,11 +304,11 @@ void registerStoragePostgreSQL(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         for (auto & engine_arg : engine_args)
-            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.local_context);
+            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
 
         auto host_port = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
         /// Split into replicas if needed.
-        size_t max_addresses = args.context.getSettingsRef().glob_expansion_max_elements;
+        size_t max_addresses = args.getContext()->getSettingsRef().glob_expansion_max_elements;
         auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 5432);
 
         const String & remote_database = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
@@ -325,12 +325,12 @@ void registerStoragePostgreSQL(StorageFactory & factory)
             addresses,
             username,
             password,
-            args.context.getSettingsRef().postgresql_connection_pool_size,
-            args.context.getSettingsRef().postgresql_connection_pool_wait_timeout);
+            args.getContext()->getSettingsRef().postgresql_connection_pool_size,
+            args.getContext()->getSettingsRef().postgresql_connection_pool_wait_timeout);
 
         return StoragePostgreSQL::create(
             args.table_id, pool, remote_table,
-            args.columns, args.constraints, args.context, remote_table_schema);
+            args.columns, args.constraints, args.getContext(), remote_table_schema);
     },
     {
         .source_access_type = AccessType::POSTGRES,
diff --git a/src/Storages/StoragePostgreSQL.h b/src/Storages/StoragePostgreSQL.h
index ec06a698c1f..29a43e1219a 100644
--- a/src/Storages/StoragePostgreSQL.h
+++ b/src/Storages/StoragePostgreSQL.h
@@ -27,7 +27,7 @@ public:
         const String & remote_table_name_,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        const Context & context_,
+        ContextPtr context_,
         const std::string & remote_table_schema_ = "");
 
     String getName() const override { return "PostgreSQL"; }
@@ -36,19 +36,19 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
 private:
     friend class PostgreSQLBlockOutputStream;
 
     String remote_table_name;
     String remote_table_schema;
-    Context global_context;
+    ContextPtr global_context;
     postgres::PoolWithFailoverPtr pool;
 };
 
diff --git a/src/Storages/StorageProxy.h b/src/Storages/StorageProxy.h
index 0349319d8fa..6fd2a86b6eb 100644
--- a/src/Storages/StorageProxy.h
+++ b/src/Storages/StorageProxy.h
@@ -32,7 +32,7 @@ public:
     NamesAndTypesList getVirtuals() const override { return getNested()->getVirtuals(); }
 
     QueryProcessingStage::Enum getQueryProcessingStage(
-        const Context & context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & ast) const override
+        ContextPtr context, QueryProcessingStage::Enum to_stage, SelectQueryInfo & ast) const override
     {
         return getNested()->getQueryProcessingStage(context, to_stage, ast);
     }
@@ -40,7 +40,7 @@ public:
     BlockInputStreams watch(
         const Names & column_names,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size,
         unsigned num_streams) override
@@ -52,7 +52,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override
@@ -60,10 +60,7 @@ public:
         return getNested()->read(column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
     }
 
-    BlockOutputStreamPtr write(
-        const ASTPtr & query,
-        const StorageMetadataPtr & metadata_snapshot,
-        const Context & context) override
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & metadata_snapshot, ContextPtr context) override
     {
         return getNested()->write(query, metadata_snapshot, context);
     }
@@ -73,7 +70,7 @@ public:
     void truncate(
         const ASTPtr & query,
         const StorageMetadataPtr & metadata_snapshot,
-        const Context & context,
+        ContextPtr context,
         TableExclusiveLockHolder & lock) override
     {
         getNested()->truncate(query, metadata_snapshot, context, lock);
@@ -91,13 +88,13 @@ public:
         IStorage::renameInMemory(new_table_id);
     }
 
-    void alter(const AlterCommands & params, const Context & context, TableLockHolder & alter_lock_holder) override
+    void alter(const AlterCommands & params, ContextPtr context, TableLockHolder & alter_lock_holder) override
     {
         getNested()->alter(params, context, alter_lock_holder);
         IStorage::setInMemoryMetadata(getNested()->getInMemoryMetadata());
     }
 
-    void checkAlterIsPossible(const AlterCommands & commands, const Context & context) const override
+    void checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const override
     {
         getNested()->checkAlterIsPossible(commands, context);
     }
@@ -105,7 +102,7 @@ public:
     Pipe alterPartition(
             const StorageMetadataPtr & metadata_snapshot,
             const PartitionCommands & commands,
-            const Context & context) override
+            ContextPtr context) override
     {
         return getNested()->alterPartition(metadata_snapshot, commands, context);
     }
@@ -122,12 +119,12 @@ public:
             bool final,
             bool deduplicate,
             const Names & deduplicate_by_columns,
-            const Context & context) override
+            ContextPtr context) override
     {
         return getNested()->optimize(query, metadata_snapshot, partition, final, deduplicate, deduplicate_by_columns, context);
     }
 
-    void mutate(const MutationCommands & commands, const Context & context) override { getNested()->mutate(commands, context); }
+    void mutate(const MutationCommands & commands, ContextPtr context) override { getNested()->mutate(commands, context); }
 
     CancellationCode killMutation(const String & mutation_id) override { return getNested()->killMutation(mutation_id); }
 
@@ -137,12 +134,12 @@ public:
     ActionLock getActionLock(StorageActionBlockType action_type) override { return getNested()->getActionLock(action_type); }
 
     bool supportsIndexForIn() const override { return getNested()->supportsIndexForIn(); }
-    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & metadata_snapshot) const override
+    bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, ContextPtr query_context, const StorageMetadataPtr & metadata_snapshot) const override
     {
         return getNested()->mayBenefitFromIndexForIn(left_in_operand, query_context, metadata_snapshot);
     }
 
-    CheckResults checkData(const ASTPtr & query , const Context & context) override { return getNested()->checkData(query, context); }
+    CheckResults checkData(const ASTPtr & query , ContextPtr context) override { return getNested()->checkData(query, context); }
     void checkTableCanBeDropped() const override { getNested()->checkTableCanBeDropped(); }
     void checkPartitionCanBeDropped(const ASTPtr & partition) override { getNested()->checkPartitionCanBeDropped(partition); }
     bool storesDataOnDisk() const override { return getNested()->storesDataOnDisk(); }
diff --git a/src/Storages/StorageReplicatedMergeTree.cpp b/src/Storages/StorageReplicatedMergeTree.cpp
index 28ea95358d1..fca2716f590 100644
--- a/src/Storages/StorageReplicatedMergeTree.cpp
+++ b/src/Storages/StorageReplicatedMergeTree.cpp
@@ -163,11 +163,11 @@ void StorageReplicatedMergeTree::setZooKeeper()
     std::lock_guard lock(current_zookeeper_mutex);
     if (zookeeper_name == default_zookeeper_name)
     {
-        current_zookeeper = global_context.getZooKeeper();
+        current_zookeeper = getContext()->getZooKeeper();
     }
     else
     {
-        current_zookeeper = global_context.getAuxiliaryZooKeeper(zookeeper_name);
+        current_zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
     }
 }
 
@@ -231,7 +231,7 @@ StorageReplicatedMergeTree::StorageReplicatedMergeTree(
     const StorageID & table_id_,
     const String & relative_data_path_,
     const StorageInMemoryMetadata & metadata_,
-    Context & context_,
+    ContextPtr context_,
     const String & date_column_name,
     const MergingParams & merging_params_,
     std::unique_ptr<MergeTreeSettings> settings_,
@@ -253,34 +253,34 @@ StorageReplicatedMergeTree::StorageReplicatedMergeTree(
     , replica_path(zookeeper_path + "/replicas/" + replica_name_)
     , reader(*this)
     , writer(*this)
-    , merger_mutator(*this, global_context.getSettingsRef().background_pool_size)
+    , merger_mutator(*this, getContext()->getSettingsRef().background_pool_size)
     , merge_strategy_picker(*this)
     , queue(*this, merge_strategy_picker)
     , fetcher(*this)
-    , background_executor(*this, global_context)
-    , background_moves_executor(*this, global_context)
+    , background_executor(*this, getContext())
+    , background_moves_executor(*this, getContext())
     , cleanup_thread(*this)
     , part_check_thread(*this)
     , restarting_thread(*this)
     , allow_renaming(allow_renaming_)
-    , replicated_fetches_pool_size(global_context.getSettingsRef().background_fetches_pool_size)
+    , replicated_fetches_pool_size(getContext()->getSettingsRef().background_fetches_pool_size)
 {
-    queue_updating_task = global_context.getSchedulePool().createTask(
+    queue_updating_task = getContext()->getSchedulePool().createTask(
         getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::queueUpdatingTask)", [this]{ queueUpdatingTask(); });
 
-    mutations_updating_task = global_context.getSchedulePool().createTask(
+    mutations_updating_task = getContext()->getSchedulePool().createTask(
         getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mutationsUpdatingTask)", [this]{ mutationsUpdatingTask(); });
 
-    merge_selecting_task = global_context.getSchedulePool().createTask(
+    merge_selecting_task = getContext()->getSchedulePool().createTask(
         getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mergeSelectingTask)", [this] { mergeSelectingTask(); });
 
     /// Will be activated if we win leader election.
     merge_selecting_task->deactivate();
 
-    mutations_finalizing_task = global_context.getSchedulePool().createTask(
+    mutations_finalizing_task = getContext()->getSchedulePool().createTask(
         getStorageID().getFullTableName() + " (StorageReplicatedMergeTree::mutationsFinalizingTask)", [this] { mutationsFinalizingTask(); });
 
-    if (global_context.hasZooKeeper() || global_context.hasAuxiliaryZooKeeper(zookeeper_name))
+    if (getContext()->hasZooKeeper() || getContext()->hasAuxiliaryZooKeeper(zookeeper_name))
     {
         /// It's possible for getZooKeeper() to timeout if  zookeeper host(s) can't
         /// be reached. In such cases Poco::Exception is thrown after a connection
@@ -299,11 +299,11 @@ StorageReplicatedMergeTree::StorageReplicatedMergeTree(
         {
             if (zookeeper_name == default_zookeeper_name)
             {
-                current_zookeeper = global_context.getZooKeeper();
+                current_zookeeper = getContext()->getZooKeeper();
             }
             else
             {
-                current_zookeeper = global_context.getAuxiliaryZooKeeper(zookeeper_name);
+                current_zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
             }
         }
         catch (...)
@@ -778,9 +778,9 @@ void StorageReplicatedMergeTree::drop()
         /// and calling StorageReplicatedMergeTree::getZooKeeper()/getAuxiliaryZooKeeper() won't suffice.
         zkutil::ZooKeeperPtr zookeeper;
         if (zookeeper_name == default_zookeeper_name)
-            zookeeper = global_context.getZooKeeper();
+            zookeeper = getContext()->getZooKeeper();
         else
-            zookeeper = global_context.getAuxiliaryZooKeeper(zookeeper_name);
+            zookeeper = getContext()->getAuxiliaryZooKeeper(zookeeper_name);
 
         /// If probably there is metadata in ZooKeeper, we don't allow to drop the table.
         if (!zookeeper)
@@ -898,7 +898,7 @@ void StorageReplicatedMergeTree::checkTableStructure(const String & zookeeper_pr
     Coordination::Stat metadata_stat;
     String metadata_str = zookeeper->get(zookeeper_prefix + "/metadata", &metadata_stat);
     auto metadata_from_zk = ReplicatedMergeTreeTableMetadata::parse(metadata_str);
-    old_metadata.checkEquals(metadata_from_zk, metadata_snapshot->getColumns(), global_context);
+    old_metadata.checkEquals(metadata_from_zk, metadata_snapshot->getColumns(), getContext());
 
     Coordination::Stat columns_stat;
     auto columns_from_zk = ColumnsDescription::parse(zookeeper->get(zookeeper_prefix + "/columns", &columns_stat));
@@ -943,7 +943,7 @@ void StorageReplicatedMergeTree::setTableStructure(
             auto & sorting_key = new_metadata.sorting_key;
             auto & primary_key = new_metadata.primary_key;
 
-            sorting_key.recalculateWithNewAST(order_by_ast, new_metadata.columns, global_context);
+            sorting_key.recalculateWithNewAST(order_by_ast, new_metadata.columns, getContext());
 
             if (primary_key.definition_ast == nullptr)
             {
@@ -951,18 +951,18 @@ void StorageReplicatedMergeTree::setTableStructure(
                 /// save the old ORDER BY expression as the new primary key.
                 auto old_sorting_key_ast = old_metadata.getSortingKey().definition_ast;
                 primary_key = KeyDescription::getKeyFromAST(
-                    old_sorting_key_ast, new_metadata.columns, global_context);
+                    old_sorting_key_ast, new_metadata.columns, getContext());
             }
         }
 
         if (metadata_diff.sampling_expression_changed)
         {
             auto sample_by_ast = parse_key_expr(metadata_diff.new_sampling_expression);
-            new_metadata.sampling_key.recalculateWithNewAST(sample_by_ast, new_metadata.columns, global_context);
+            new_metadata.sampling_key.recalculateWithNewAST(sample_by_ast, new_metadata.columns, getContext());
         }
 
         if (metadata_diff.skip_indices_changed)
-            new_metadata.secondary_indices = IndicesDescription::parse(metadata_diff.new_skip_indices, new_columns, global_context);
+            new_metadata.secondary_indices = IndicesDescription::parse(metadata_diff.new_skip_indices, new_columns, getContext());
 
         if (metadata_diff.constraints_changed)
             new_metadata.constraints = ConstraintsDescription::parse(metadata_diff.new_constraints);
@@ -974,7 +974,7 @@ void StorageReplicatedMergeTree::setTableStructure(
                 ParserTTLExpressionList parser;
                 auto ttl_for_table_ast = parseQuery(parser, metadata_diff.new_ttl_table, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
                 new_metadata.table_ttl = TTLTableDescription::getTTLForTableFromAST(
-                    ttl_for_table_ast, new_metadata.columns, global_context, new_metadata.primary_key);
+                    ttl_for_table_ast, new_metadata.columns, getContext(), new_metadata.primary_key);
             }
             else /// TTL was removed
             {
@@ -987,39 +987,39 @@ void StorageReplicatedMergeTree::setTableStructure(
     new_metadata.column_ttls_by_name.clear();
     for (const auto & [name, ast] : new_metadata.columns.getColumnTTLs())
     {
-        auto new_ttl_entry = TTLDescription::getTTLFromAST(ast, new_metadata.columns, global_context, new_metadata.primary_key);
+        auto new_ttl_entry = TTLDescription::getTTLFromAST(ast, new_metadata.columns, getContext(), new_metadata.primary_key);
         new_metadata.column_ttls_by_name[name] = new_ttl_entry;
     }
 
     if (new_metadata.partition_key.definition_ast != nullptr)
-        new_metadata.partition_key.recalculateWithNewColumns(new_metadata.columns, global_context);
+        new_metadata.partition_key.recalculateWithNewColumns(new_metadata.columns, getContext());
 
     if (!metadata_diff.sorting_key_changed) /// otherwise already updated
-        new_metadata.sorting_key.recalculateWithNewColumns(new_metadata.columns, global_context);
+        new_metadata.sorting_key.recalculateWithNewColumns(new_metadata.columns, getContext());
 
     /// Primary key is special, it exists even if not defined
     if (new_metadata.primary_key.definition_ast != nullptr)
     {
-        new_metadata.primary_key.recalculateWithNewColumns(new_metadata.columns, global_context);
+        new_metadata.primary_key.recalculateWithNewColumns(new_metadata.columns, getContext());
     }
     else
     {
-        new_metadata.primary_key = KeyDescription::getKeyFromAST(new_metadata.sorting_key.definition_ast, new_metadata.columns, global_context);
+        new_metadata.primary_key = KeyDescription::getKeyFromAST(new_metadata.sorting_key.definition_ast, new_metadata.columns, getContext());
         new_metadata.primary_key.definition_ast = nullptr;
     }
 
     if (!metadata_diff.sampling_expression_changed && new_metadata.sampling_key.definition_ast != nullptr)
-        new_metadata.sampling_key.recalculateWithNewColumns(new_metadata.columns, global_context);
+        new_metadata.sampling_key.recalculateWithNewColumns(new_metadata.columns, getContext());
 
     if (!metadata_diff.skip_indices_changed) /// otherwise already updated
     {
         for (auto & index : new_metadata.secondary_indices)
-            index.recalculateWithNewColumns(new_metadata.columns, global_context);
+            index.recalculateWithNewColumns(new_metadata.columns, getContext());
     }
 
     if (!metadata_diff.ttl_table_changed && new_metadata.table_ttl.definition_ast != nullptr)
         new_metadata.table_ttl = TTLTableDescription::getTTLForTableFromAST(
-            new_metadata.table_ttl.definition_ast, new_metadata.columns, global_context, new_metadata.primary_key);
+            new_metadata.table_ttl.definition_ast, new_metadata.columns, getContext(), new_metadata.primary_key);
 
     /// Even if the primary/sorting/partition keys didn't change we must reinitialize it
     /// because primary/partition key column types might have changed.
@@ -1027,7 +1027,7 @@ void StorageReplicatedMergeTree::setTableStructure(
     setProperties(new_metadata, old_metadata);
 
     auto table_id = getStorageID();
-    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(global_context, table_id, new_metadata);
+    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(getContext(), table_id, new_metadata);
 }
 
 
@@ -1654,13 +1654,12 @@ bool StorageReplicatedMergeTree::tryExecuteMerge(const LogEntry & entry)
 
     /// Account TTL merge
     if (isTTLMergeType(future_merged_part.merge_type))
-        global_context.getMergeList().bookMergeWithTTL();
+        getContext()->getMergeList().bookMergeWithTTL();
 
     auto table_id = getStorageID();
 
     /// Add merge to list
-    MergeList::EntryPtr merge_entry = global_context.getMergeList().insert(
-        table_id.database_name, table_id.table_name, future_merged_part);
+    MergeList::EntryPtr merge_entry = getContext()->getMergeList().insert(table_id.database_name, table_id.table_name, future_merged_part);
 
     Transaction transaction(*this);
     MutableDataPartPtr part;
@@ -1678,7 +1677,7 @@ bool StorageReplicatedMergeTree::tryExecuteMerge(const LogEntry & entry)
     {
         part = merger_mutator.mergePartsToTemporaryPart(
             future_merged_part, metadata_snapshot, *merge_entry,
-            table_lock, entry.create_time, global_context, reserved_space, entry.deduplicate, entry.deduplicate_by_columns);
+            table_lock, entry.create_time, getContext(), reserved_space, entry.deduplicate, entry.deduplicate_by_columns);
 
         merger_mutator.renameMergedTemporaryPart(part, parts, &transaction);
 
@@ -1798,7 +1797,7 @@ bool StorageReplicatedMergeTree::tryExecutePartMutation(const StorageReplicatedM
     future_mutated_part.type = source_part->getType();
 
     auto table_id = getStorageID();
-    MergeList::EntryPtr merge_entry = global_context.getMergeList().insert(
+    MergeList::EntryPtr merge_entry = getContext()->getMergeList().insert(
         table_id.database_name, table_id.table_name, future_mutated_part);
 
     Stopwatch stopwatch;
@@ -1814,7 +1813,7 @@ bool StorageReplicatedMergeTree::tryExecutePartMutation(const StorageReplicatedM
     {
         new_part = merger_mutator.mutatePartToTemporaryPart(
             future_mutated_part, metadata_snapshot, commands, *merge_entry,
-            entry.create_time, global_context, reserved_space, table_lock);
+            entry.create_time, getContext(), reserved_space, table_lock);
         renameTempPartAndReplace(new_part, nullptr, &transaction);
 
         try
@@ -2164,12 +2163,20 @@ bool StorageReplicatedMergeTree::executeReplaceRange(const LogEntry & entry)
 
     struct PartDescription
     {
-        PartDescription(size_t index_, const String & src_part_name_, const String & new_part_name_, const String & checksum_hex_,
-                        MergeTreeDataFormatVersion format_version)
-            : index(index_),
-            src_part_name(src_part_name_), src_part_info(MergeTreePartInfo::fromPartName(src_part_name_, format_version)),
-            new_part_name(new_part_name_), new_part_info(MergeTreePartInfo::fromPartName(new_part_name_, format_version)),
-            checksum_hex(checksum_hex_) {}
+        PartDescription(
+            size_t index_,
+            const String & src_part_name_,
+            const String & new_part_name_,
+            const String & checksum_hex_,
+            MergeTreeDataFormatVersion format_version)
+            : index(index_)
+            , src_part_name(src_part_name_)
+            , src_part_info(MergeTreePartInfo::fromPartName(src_part_name_, format_version))
+            , new_part_name(new_part_name_)
+            , new_part_info(MergeTreePartInfo::fromPartName(new_part_name_, format_version))
+            , checksum_hex(checksum_hex_)
+        {
+        }
 
         size_t index; // in log entry arrays
         String src_part_name;
@@ -2244,7 +2251,7 @@ bool StorageReplicatedMergeTree::executeReplaceRange(const LogEntry & entry)
 
     auto clone_data_parts_from_source_table = [&] () -> size_t
     {
-        source_table = DatabaseCatalog::instance().tryGetTable(source_table_id, global_context);
+        source_table = DatabaseCatalog::instance().tryGetTable(source_table_id, getContext());
         if (!source_table)
         {
             LOG_DEBUG(log, "Can't use {} as source table for REPLACE PARTITION command. It does not exist.", source_table_id.getNameForLogs());
@@ -2400,10 +2407,10 @@ bool StorageReplicatedMergeTree::executeReplaceRange(const LogEntry & entry)
         {
             String source_replica_path = zookeeper_path + "/replicas/" + part_desc->replica;
             ReplicatedMergeTreeAddress address(getZooKeeper()->get(source_replica_path + "/host"));
-            auto timeouts = getFetchPartHTTPTimeouts(global_context);
+            auto timeouts = getFetchPartHTTPTimeouts(getContext());
 
-            auto credentials = global_context.getInterserverCredentials();
-            String interserver_scheme = global_context.getInterserverScheme();
+            auto credentials = getContext()->getInterserverCredentials();
+            String interserver_scheme = getContext()->getInterserverScheme();
 
             if (interserver_scheme != address.scheme)
                 throw Exception("Interserver schemas are different '" + interserver_scheme + "' != '" + address.scheme + "', can't fetch part from " + address.host, ErrorCodes::LOGICAL_ERROR);
@@ -2459,11 +2466,11 @@ bool StorageReplicatedMergeTree::executeReplaceRange(const LogEntry & entry)
                 parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, false, data_parts_lock);
         }
 
-        PartLog::addNewParts(global_context, res_parts, watch.elapsed());
+        PartLog::addNewParts(getContext(), res_parts, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewParts(global_context, res_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
+        PartLog::addNewParts(getContext(), res_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
         throw;
     }
 
@@ -3298,7 +3305,7 @@ void StorageReplicatedMergeTree::enterLeaderElection()
     try
     {
         leader_election = std::make_shared<zkutil::LeaderElection>(
-            global_context.getSchedulePool(),
+            getContext()->getSchedulePool(),
             zookeeper_path + "/leader_election",
             *current_zookeeper,    /// current_zookeeper lives for the lifetime of leader_election,
                                    ///  since before changing `current_zookeeper`, `leader_election` object is destroyed in `partialShutdown` method.
@@ -3334,9 +3341,9 @@ void StorageReplicatedMergeTree::exitLeaderElection()
     leader_election = nullptr;
 }
 
-ConnectionTimeouts StorageReplicatedMergeTree::getFetchPartHTTPTimeouts(const Context & context)
+ConnectionTimeouts StorageReplicatedMergeTree::getFetchPartHTTPTimeouts(ContextPtr local_context)
 {
-    auto timeouts = ConnectionTimeouts::getHTTPTimeouts(context);
+    auto timeouts = ConnectionTimeouts::getHTTPTimeouts(local_context);
     auto settings = getSettings();
 
     if (settings->replicated_fetches_http_connection_timeout.changed)
@@ -3771,10 +3778,10 @@ bool StorageReplicatedMergeTree::fetchPart(const String & part_name, const Stora
     else
     {
         address.fromString(zookeeper->get(source_replica_path + "/host"));
-        timeouts = getFetchPartHTTPTimeouts(global_context);
+        timeouts = getFetchPartHTTPTimeouts(getContext());
 
-        credentials = global_context.getInterserverCredentials();
-        interserver_scheme = global_context.getInterserverScheme();
+        credentials = getContext()->getInterserverCredentials();
+        interserver_scheme = getContext()->getInterserverScheme();
 
         get_part = [&, address, timeouts, credentials, interserver_scheme]()
         {
@@ -3928,9 +3935,9 @@ bool StorageReplicatedMergeTree::fetchExistsPart(const String & part_name, const
     std::function<MutableDataPartPtr()> get_part;
 
     ReplicatedMergeTreeAddress address(zookeeper->get(source_replica_path + "/host"));
-    auto timeouts = ConnectionTimeouts::getHTTPTimeouts(global_context);
-    auto credentials = global_context.getInterserverCredentials();
-    String interserver_scheme = global_context.getInterserverScheme();
+    auto timeouts = ConnectionTimeouts::getHTTPTimeouts(getContext());
+    auto credentials = getContext()->getInterserverCredentials();
+    String interserver_scheme = getContext()->getInterserverScheme();
 
     get_part = [&, address, timeouts, interserver_scheme, credentials]()
     {
@@ -3990,7 +3997,7 @@ void StorageReplicatedMergeTree::startup()
         InterserverIOEndpointPtr data_parts_exchange_ptr = std::make_shared<DataPartsExchange::Service>(*this);
         [[maybe_unused]] auto prev_ptr = std::atomic_exchange(&data_parts_exchange_endpoint, data_parts_exchange_ptr);
         assert(prev_ptr == nullptr);
-        global_context.getInterserverIOHandler().addEndpoint(data_parts_exchange_ptr->getId(replica_path), data_parts_exchange_ptr);
+        getContext()->getInterserverIOHandler().addEndpoint(data_parts_exchange_ptr->getId(replica_path), data_parts_exchange_ptr);
 
         /// In this thread replica will be activated.
         restarting_thread.start();
@@ -4045,7 +4052,7 @@ void StorageReplicatedMergeTree::shutdown()
     auto data_parts_exchange_ptr = std::atomic_exchange(&data_parts_exchange_endpoint, InterserverIOEndpointPtr{});
     if (data_parts_exchange_ptr)
     {
-        global_context.getInterserverIOHandler().removeEndpointIfExists(data_parts_exchange_ptr->getId(replica_path));
+        getContext()->getInterserverIOHandler().removeEndpointIfExists(data_parts_exchange_ptr->getId(replica_path));
         /// Ask all parts exchange handlers to finish asap. New ones will fail to start
         data_parts_exchange_ptr->blocker.cancelForever();
         /// Wait for all of them
@@ -4131,7 +4138,7 @@ void StorageReplicatedMergeTree::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t max_block_size,
     const unsigned num_streams)
@@ -4141,15 +4148,15 @@ void StorageReplicatedMergeTree::read(
     * 2. Do not read parts that have not yet been written to the quorum of the replicas.
     * For this you have to synchronously go to ZooKeeper.
     */
-    if (context.getSettingsRef().select_sequential_consistency)
+    if (local_context->getSettingsRef().select_sequential_consistency)
     {
         auto max_added_blocks = getMaxAddedBlocks();
-        if (auto plan = reader.read(column_names, metadata_snapshot, query_info, context, max_block_size, num_streams, &max_added_blocks))
+        if (auto plan = reader.read(column_names, metadata_snapshot, query_info, local_context, max_block_size, num_streams, &max_added_blocks))
             query_plan = std::move(*plan);
         return;
     }
 
-    if (auto plan = reader.read(column_names, metadata_snapshot, query_info, context, max_block_size, num_streams))
+    if (auto plan = reader.read(column_names, metadata_snapshot, query_info, local_context, max_block_size, num_streams))
         query_plan = std::move(*plan);
 }
 
@@ -4157,16 +4164,16 @@ Pipe StorageReplicatedMergeTree::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
 {
     QueryPlan plan;
-    read(plan, column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    read(plan, column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
     return plan.convertToPipe(
-        QueryPlanOptimizationSettings::fromContext(context),
-        BuildQueryPipelineSettings::fromContext(context));
+        QueryPlanOptimizationSettings::fromContext(local_context),
+        BuildQueryPipelineSettings::fromContext(local_context));
 }
 
 
@@ -4205,11 +4212,11 @@ std::optional<UInt64> StorageReplicatedMergeTree::totalRows(const Settings & set
     return res;
 }
 
-std::optional<UInt64> StorageReplicatedMergeTree::totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, const Context & context) const
+std::optional<UInt64> StorageReplicatedMergeTree::totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, ContextPtr local_context) const
 {
     DataPartsVector parts;
-    foreachCommittedParts([&](auto & part) { parts.push_back(part); }, context.getSettingsRef().select_sequential_consistency);
-    return totalRowsByPartitionPredicateImpl(query_info, context, parts);
+    foreachCommittedParts([&](auto & part) { parts.push_back(part); }, local_context->getSettingsRef().select_sequential_consistency);
+    return totalRowsByPartitionPredicateImpl(query_info, local_context, parts);
 }
 
 std::optional<UInt64> StorageReplicatedMergeTree::totalBytes(const Settings & settings) const
@@ -4227,12 +4234,12 @@ void StorageReplicatedMergeTree::assertNotReadonly() const
 }
 
 
-BlockOutputStreamPtr StorageReplicatedMergeTree::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageReplicatedMergeTree::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
     const auto storage_settings_ptr = getSettings();
     assertNotReadonly();
 
-    const Settings & query_settings = context.getSettingsRef();
+    const Settings & query_settings = local_context->getSettingsRef();
     bool deduplicate = storage_settings_ptr->replicated_deduplication_window != 0 && query_settings.insert_deduplicate;
 
     // TODO: should we also somehow pass list of columns to deduplicate on to the ReplicatedMergeTreeBlockOutputStream ?
@@ -4242,7 +4249,7 @@ BlockOutputStreamPtr StorageReplicatedMergeTree::write(const ASTPtr & /*query*/,
         query_settings.max_partitions_per_insert_block,
         query_settings.insert_quorum_parallel,
         deduplicate,
-        context.getSettingsRef().optimize_on_insert);
+        local_context->getSettingsRef().optimize_on_insert);
 }
 
 
@@ -4253,11 +4260,11 @@ bool StorageReplicatedMergeTree::optimize(
     bool final,
     bool deduplicate,
     const Names & deduplicate_by_columns,
-    const Context & query_context)
+    ContextPtr query_context)
 {
     /// NOTE: exclusive lock cannot be used here, since this may lead to deadlock (see comments below),
     /// but it should be safe to use non-exclusive to avoid dropping parts that may be required for processing queue.
-    auto table_lock = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+    auto table_lock = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
 
     assertNotReadonly();
 
@@ -4272,7 +4279,7 @@ bool StorageReplicatedMergeTree::optimize(
 
         auto handle_noop = [&] (const String & message)
         {
-            if (query_context.getSettingsRef().optimize_throw_if_noop)
+            if (query_context->getSettingsRef().optimize_throw_if_noop)
                 throw Exception(message, ErrorCodes::CANNOT_ASSIGN_OPTIMIZE);
             return false;
         };
@@ -4306,7 +4313,7 @@ bool StorageReplicatedMergeTree::optimize(
                         future_merged_part.uuid = UUIDHelpers::generateV4();
 
                     SelectPartsDecision select_decision = merger_mutator.selectAllPartsToMergeWithinPartition(
-                        future_merged_part, disk_space, can_merge, partition_id, true, metadata_snapshot, nullptr, query_context.getSettingsRef().optimize_skip_merged_partitions);
+                        future_merged_part, disk_space, can_merge, partition_id, true, metadata_snapshot, nullptr, query_context->getSettingsRef().optimize_skip_merged_partitions);
 
                     if (select_decision != SelectPartsDecision::SELECTED)
                         break;
@@ -4357,7 +4364,7 @@ bool StorageReplicatedMergeTree::optimize(
                     UInt64 disk_space = getStoragePolicy()->getMaxUnreservedFreeSpace();
                     String partition_id = getPartitionIDFromQuery(partition, query_context);
                     select_decision = merger_mutator.selectAllPartsToMergeWithinPartition(
-                        future_merged_part, disk_space, can_merge, partition_id, final, metadata_snapshot, &disable_reason, query_context.getSettingsRef().optimize_skip_merged_partitions);
+                        future_merged_part, disk_space, can_merge, partition_id, final, metadata_snapshot, &disable_reason, query_context->getSettingsRef().optimize_skip_merged_partitions);
                 }
 
                 /// If there is nothing to merge then we treat this merge as successful (needed for optimize final optimization)
@@ -4395,7 +4402,7 @@ bool StorageReplicatedMergeTree::optimize(
         }
     }
 
-    if (query_context.getSettingsRef().replication_alter_partitions_sync != 0)
+    if (query_context->getSettingsRef().replication_alter_partitions_sync != 0)
     {
         /// NOTE Table lock must not be held while waiting. Some combination of R-W-R locks from different threads will yield to deadlock.
         for (auto & merge_entry : merge_entries)
@@ -4440,7 +4447,7 @@ bool StorageReplicatedMergeTree::executeMetadataAlter(const StorageReplicatedMer
 
 
 std::set<String> StorageReplicatedMergeTree::getPartitionIdsAffectedByCommands(
-    const MutationCommands & commands, const Context & query_context) const
+    const MutationCommands & commands, ContextPtr query_context) const
 {
     std::set<String> affected_partition_ids;
 
@@ -4462,7 +4469,7 @@ std::set<String> StorageReplicatedMergeTree::getPartitionIdsAffectedByCommands(
 
 
 PartitionBlockNumbersHolder StorageReplicatedMergeTree::allocateBlockNumbersInAffectedPartitions(
-    const MutationCommands & commands, const Context & query_context, const zkutil::ZooKeeperPtr & zookeeper) const
+    const MutationCommands & commands, ContextPtr query_context, const zkutil::ZooKeeperPtr & zookeeper) const
 {
     const std::set<String> mutation_affected_partition_ids = getPartitionIdsAffectedByCommands(commands, query_context);
 
@@ -4494,7 +4501,7 @@ PartitionBlockNumbersHolder StorageReplicatedMergeTree::allocateBlockNumbersInAf
 
 
 void StorageReplicatedMergeTree::alter(
-    const AlterCommands & commands, const Context & query_context, TableLockHolder & table_lock_holder)
+    const AlterCommands & commands, ContextPtr query_context, TableLockHolder & table_lock_holder)
 {
     assertNotReadonly();
 
@@ -4601,7 +4608,7 @@ void StorageReplicatedMergeTree::alter(
         alter_entry->create_time = time(nullptr);
 
         auto maybe_mutation_commands = commands.getMutationCommands(
-            *current_metadata, query_context.getSettingsRef().materialize_ttl_after_modify, query_context);
+            *current_metadata, query_context->getSettingsRef().materialize_ttl_after_modify, query_context);
         alter_entry->have_mutation = !maybe_mutation_commands.empty();
 
         alter_path_idx = ops.size();
@@ -4633,7 +4640,7 @@ void StorageReplicatedMergeTree::alter(
                 zkutil::makeCreateRequest(mutations_path + "/", mutation_entry.toString(), zkutil::CreateMode::PersistentSequential));
         }
 
-        if (auto txn = query_context.getZooKeeperMetadataTransaction())
+        if (auto txn = query_context->getZooKeeperMetadataTransaction())
         {
             txn->moveOpsTo(ops);
             /// NOTE: IDatabase::alterTable(...) is called when executing ALTER_METADATA queue entry without query context,
@@ -4689,12 +4696,12 @@ void StorageReplicatedMergeTree::alter(
     table_lock_holder.reset();
 
     std::vector<String> unwaited;
-    if (query_context.getSettingsRef().replication_alter_partitions_sync == 2)
+    if (query_context->getSettingsRef().replication_alter_partitions_sync == 2)
     {
         LOG_DEBUG(log, "Updated shared metadata nodes in ZooKeeper. Waiting for replicas to apply changes.");
         unwaited = waitForAllReplicasToProcessLogEntry(*alter_entry, false);
     }
-    else if (query_context.getSettingsRef().replication_alter_partitions_sync == 1)
+    else if (query_context->getSettingsRef().replication_alter_partitions_sync == 1)
     {
         LOG_DEBUG(log, "Updated shared metadata nodes in ZooKeeper. Waiting for replicas to apply changes.");
         waitForReplicaToProcessLogEntry(replica_name, *alter_entry);
@@ -4706,7 +4713,7 @@ void StorageReplicatedMergeTree::alter(
     if (mutation_znode)
     {
         LOG_DEBUG(log, "Metadata changes applied. Will wait for data changes.");
-        waitMutation(*mutation_znode, query_context.getSettingsRef().replication_alter_partitions_sync);
+        waitMutation(*mutation_znode, query_context->getSettingsRef().replication_alter_partitions_sync);
         LOG_DEBUG(log, "Data changes applied.");
     }
 }
@@ -4770,7 +4777,7 @@ bool StorageReplicatedMergeTree::getFakePartCoveringAllPartsInPartition(const St
 }
 
 
-void StorageReplicatedMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool drop_part, const Context & query_context, bool throw_if_noop)
+void StorageReplicatedMergeTree::dropPartition(const ASTPtr & partition, bool detach, bool drop_part, ContextPtr query_context, bool throw_if_noop)
 {
     assertNotReadonly();
     if (!is_leader)
@@ -4795,9 +4802,9 @@ void StorageReplicatedMergeTree::dropPartition(const ASTPtr & partition, bool de
     if (did_drop)
     {
         /// If necessary, wait until the operation is performed on itself or on all replicas.
-        if (query_context.getSettingsRef().replication_alter_partitions_sync != 0)
+        if (query_context->getSettingsRef().replication_alter_partitions_sync != 0)
         {
-            if (query_context.getSettingsRef().replication_alter_partitions_sync == 1)
+            if (query_context->getSettingsRef().replication_alter_partitions_sync == 1)
                 waitForReplicaToProcessLogEntry(replica_name, entry);
             else
                 waitForAllReplicasToProcessLogEntry(entry);
@@ -4813,7 +4820,7 @@ void StorageReplicatedMergeTree::dropPartition(const ASTPtr & partition, bool de
 
 
 void StorageReplicatedMergeTree::truncate(
-    const ASTPtr &, const StorageMetadataPtr &, const Context & query_context, TableExclusiveLockHolder & table_lock)
+    const ASTPtr &, const StorageMetadataPtr &, ContextPtr query_context, TableExclusiveLockHolder & table_lock)
 {
     table_lock.release();   /// Truncate is done asynchronously.
 
@@ -4839,7 +4846,7 @@ PartitionCommandsResultInfo StorageReplicatedMergeTree::attachPartition(
     const ASTPtr & partition,
     const StorageMetadataPtr & metadata_snapshot,
     bool attach_part,
-    const Context & query_context)
+    ContextPtr query_context)
 {
     assertNotReadonly();
 
@@ -4874,7 +4881,7 @@ PartitionCommandsResultInfo StorageReplicatedMergeTree::attachPartition(
 void StorageReplicatedMergeTree::checkTableCanBeDropped() const
 {
     auto table_id = getStorageID();
-    global_context.checkTableCanBeDropped(table_id.database_name, table_id.table_name, getTotalActiveSizeInBytes());
+    getContext()->checkTableCanBeDropped(table_id.database_name, table_id.table_name, getTotalActiveSizeInBytes());
 }
 
 void StorageReplicatedMergeTree::checkTableCanBeRenamed() const
@@ -5354,13 +5361,13 @@ void StorageReplicatedMergeTree::fetchPartition(
     const ASTPtr & partition,
     const StorageMetadataPtr & metadata_snapshot,
     const String & from_,
-    const Context & query_context)
+    ContextPtr query_context)
 {
     Macros::MacroExpansionInfo info;
     info.expand_special_macros_only = false;
     info.table_id = getStorageID();
     info.table_id.uuid = UUIDHelpers::Nil;
-    auto expand_from = query_context.getMacros()->expand(from_, info);
+    auto expand_from = query_context->getMacros()->expand(from_, info);
     String auxiliary_zookeeper_name = extractZooKeeperName(expand_from);
     String from = extractZooKeeperPath(expand_from);
     if (from.empty())
@@ -5370,7 +5377,7 @@ void StorageReplicatedMergeTree::fetchPartition(
     zkutil::ZooKeeperPtr zookeeper;
     if (auxiliary_zookeeper_name != default_zookeeper_name)
     {
-        zookeeper = global_context.getAuxiliaryZooKeeper(auxiliary_zookeeper_name);
+        zookeeper = getContext()->getAuxiliaryZooKeeper(auxiliary_zookeeper_name);
 
         LOG_INFO(log, "Will fetch partition {} from shard {} (auxiliary zookeeper '{}')", partition_id, from_, auxiliary_zookeeper_name);
     }
@@ -5471,7 +5478,7 @@ void StorageReplicatedMergeTree::fetchPartition(
         if (try_no)
             LOG_INFO(log, "Some of parts ({}) are missing. Will try to fetch covering parts.", missing_parts.size());
 
-        if (try_no >= query_context.getSettings().max_fetch_partition_retries_count)
+        if (try_no >= query_context->getSettings().max_fetch_partition_retries_count)
             throw Exception("Too many retries to fetch parts from " + best_replica_path, ErrorCodes::TOO_MANY_RETRIES_TO_FETCH_PARTS);
 
         Strings parts = zookeeper->getChildren(best_replica_path + "/parts");
@@ -5536,7 +5543,7 @@ void StorageReplicatedMergeTree::fetchPartition(
 }
 
 
-void StorageReplicatedMergeTree::mutate(const MutationCommands & commands, const Context & query_context)
+void StorageReplicatedMergeTree::mutate(const MutationCommands & commands, ContextPtr query_context)
 {
     /// Overview of the mutation algorithm.
     ///
@@ -5620,7 +5627,7 @@ void StorageReplicatedMergeTree::mutate(const MutationCommands & commands, const
         requests.emplace_back(zkutil::makeCreateRequest(
             mutations_path + "/", mutation_entry.toString(), zkutil::CreateMode::PersistentSequential));
 
-        if (auto txn = query_context.getZooKeeperMetadataTransaction())
+        if (auto txn = query_context->getZooKeeperMetadataTransaction())
             txn->moveOpsTo(requests);
 
         Coordination::Responses responses;
@@ -5645,7 +5652,7 @@ void StorageReplicatedMergeTree::mutate(const MutationCommands & commands, const
             throw Coordination::Exception("Unable to create a mutation znode", rc);
     }
 
-    waitMutation(mutation_entry.znode_name, query_context.getSettingsRef().mutations_sync);
+    waitMutation(mutation_entry.znode_name, query_context->getSettingsRef().mutations_sync);
 }
 
 void StorageReplicatedMergeTree::waitMutation(const String & znode_name, size_t mutations_sync) const
@@ -5689,7 +5696,7 @@ CancellationCode StorageReplicatedMergeTree::killMutation(const String & mutatio
     {
         const String & partition_id = pair.first;
         Int64 block_number = pair.second;
-        global_context.getMergeList().cancelPartMutations(partition_id, block_number);
+        getContext()->getMergeList().cancelPartMutations(partition_id, block_number);
     }
     return CancellationCode::CancelSent;
 }
@@ -5988,18 +5995,18 @@ void StorageReplicatedMergeTree::clearBlocksInPartition(
 }
 
 void StorageReplicatedMergeTree::replacePartitionFrom(
-    const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & context)
+    const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr query_context)
 {
     /// First argument is true, because we possibly will add new data to current table.
-    auto lock1 = lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
-    auto lock2 = source_table->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+    auto lock1 = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
+    auto lock2 = source_table->lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
 
     auto source_metadata_snapshot = source_table->getInMemoryMetadataPtr();
     auto metadata_snapshot = getInMemoryMetadataPtr();
 
     Stopwatch watch;
     MergeTreeData & src_data = checkStructureAndGetMergeTreeData(source_table, source_metadata_snapshot, metadata_snapshot);
-    String partition_id = getPartitionIDFromQuery(partition, context);
+    String partition_id = getPartitionIDFromQuery(partition, query_context);
 
     DataPartsVector src_all_parts = src_data.getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
     DataPartsVector src_parts;
@@ -6125,7 +6132,7 @@ void StorageReplicatedMergeTree::replacePartitionFrom(
             }
         }
 
-        if (auto txn = context.getZooKeeperMetadataTransaction())
+        if (auto txn = query_context->getZooKeeperMetadataTransaction())
             txn->moveOpsTo(ops);
 
         ops.emplace_back(zkutil::makeSetRequest(zookeeper_path + "/log", "", -1));  /// Just update version
@@ -6149,11 +6156,11 @@ void StorageReplicatedMergeTree::replacePartitionFrom(
                 parts_to_remove = removePartsInRangeFromWorkingSet(drop_range, true, false, data_parts_lock);
         }
 
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
         throw;
     }
 
@@ -6171,7 +6178,7 @@ void StorageReplicatedMergeTree::replacePartitionFrom(
     cleanup_thread.wakeup();
 
     /// If necessary, wait until the operation is performed on all replicas.
-    if (context.getSettingsRef().replication_alter_partitions_sync > 1)
+    if (query_context->getSettingsRef().replication_alter_partitions_sync > 1)
     {
         lock2.reset();
         lock1.reset();
@@ -6179,10 +6186,10 @@ void StorageReplicatedMergeTree::replacePartitionFrom(
     }
 }
 
-void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & query_context)
+void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr query_context)
 {
-    auto lock1 = lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
-    auto lock2 = dest_table->lockForShare(query_context.getCurrentQueryId(), query_context.getSettingsRef().lock_acquire_timeout);
+    auto lock1 = lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
+    auto lock2 = dest_table->lockForShare(query_context->getCurrentQueryId(), query_context->getSettingsRef().lock_acquire_timeout);
 
     auto dest_table_storage = std::dynamic_pointer_cast<StorageReplicatedMergeTree>(dest_table);
     if (!dest_table_storage)
@@ -6335,11 +6342,11 @@ void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_ta
             transaction.commit(&lock);
         }
 
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed());
     }
     catch (...)
     {
-        PartLog::addNewParts(global_context, dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
+        PartLog::addNewParts(getContext(), dst_parts, watch.elapsed(), ExecutionStatus::fromCurrentException());
         throw;
     }
 
@@ -6354,7 +6361,7 @@ void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_ta
     parts_to_remove.clear();
     cleanup_thread.wakeup();
 
-    if (query_context.getSettingsRef().replication_alter_partitions_sync > 1)
+    if (query_context->getSettingsRef().replication_alter_partitions_sync > 1)
     {
         lock2.reset();
         dest_table_storage->waitForAllReplicasToProcessLogEntry(entry);
@@ -6371,7 +6378,7 @@ void StorageReplicatedMergeTree::movePartitionToTable(const StoragePtr & dest_ta
     log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*op_results.front()).path_created;
     entry_delete.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
 
-    if (query_context.getSettingsRef().replication_alter_partitions_sync > 1)
+    if (query_context->getSettingsRef().replication_alter_partitions_sync > 1)
     {
         lock1.reset();
         waitForAllReplicasToProcessLogEntry(entry_delete);
@@ -6426,16 +6433,16 @@ void StorageReplicatedMergeTree::getCommitPartOps(
 
 ReplicatedMergeTreeAddress StorageReplicatedMergeTree::getReplicatedMergeTreeAddress() const
 {
-    auto host_port = global_context.getInterserverIOAddress();
+    auto host_port = getContext()->getInterserverIOAddress();
     auto table_id = getStorageID();
 
     ReplicatedMergeTreeAddress res;
     res.host = host_port.first;
     res.replication_port = host_port.second;
-    res.queries_port = global_context.getTCPPort();
+    res.queries_port = getContext()->getTCPPort();
     res.database = table_id.database_name;
     res.table = table_id.table_name;
-    res.scheme = global_context.getInterserverScheme();
+    res.scheme = getContext()->getInterserverScheme();
     return res;
 }
 
@@ -6596,7 +6603,7 @@ bool StorageReplicatedMergeTree::dropPart(
 }
 
 bool StorageReplicatedMergeTree::dropAllPartsInPartition(
-    zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, const Context & query_context, bool detach)
+    zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, ContextPtr query_context, bool detach)
 {
     MergeTreePartInfo drop_range_info;
     if (!getFakePartCoveringAllPartsInPartition(partition_id, drop_range_info))
@@ -6628,7 +6635,7 @@ bool StorageReplicatedMergeTree::dropAllPartsInPartition(
     Coordination::Requests ops;
     ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/log/log-", entry.toString(), zkutil::CreateMode::PersistentSequential));
     ops.emplace_back(zkutil::makeSetRequest(zookeeper_path + "/log", "", -1));  /// Just update version.
-    if (auto txn = query_context.getZooKeeperMetadataTransaction())
+    if (auto txn = query_context->getZooKeeperMetadataTransaction())
         txn->moveOpsTo(ops);
     Coordination::Responses responses = zookeeper.multi(ops);
 
@@ -6639,13 +6646,13 @@ bool StorageReplicatedMergeTree::dropAllPartsInPartition(
 }
 
 
-CheckResults StorageReplicatedMergeTree::checkData(const ASTPtr & query, const Context & context)
+CheckResults StorageReplicatedMergeTree::checkData(const ASTPtr & query, ContextPtr local_context)
 {
     CheckResults results;
     DataPartsVector data_parts;
     if (const auto & check_query = query->as<ASTCheckQuery &>(); check_query.partition)
     {
-        String partition_id = getPartitionIDFromQuery(check_query.partition, context);
+        String partition_id = getPartitionIDFromQuery(check_query.partition, local_context);
         data_parts = getDataPartsVectorInPartition(MergeTreeDataPartState::Committed, partition_id);
     }
     else
diff --git a/src/Storages/StorageReplicatedMergeTree.h b/src/Storages/StorageReplicatedMergeTree.h
index 0c8aca18c6a..4909e0e4241 100644
--- a/src/Storages/StorageReplicatedMergeTree.h
+++ b/src/Storages/StorageReplicatedMergeTree.h
@@ -96,7 +96,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -106,16 +106,16 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
     std::optional<UInt64> totalRows(const Settings & settings) const override;
-    std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, const Context & context) const override;
+    std::optional<UInt64> totalRowsByPartitionPredicate(const SelectQueryInfo & query_info, ContextPtr context) const override;
     std::optional<UInt64> totalBytes(const Settings & settings) const override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     bool optimize(
         const ASTPtr & query,
@@ -124,11 +124,11 @@ public:
         bool final,
         bool deduplicate,
         const Names & deduplicate_by_columns,
-        const Context & query_context) override;
+        ContextPtr query_context) override;
 
-    void alter(const AlterCommands & commands, const Context & query_context, TableLockHolder & table_lock_holder) override;
+    void alter(const AlterCommands & commands, ContextPtr query_context, TableLockHolder & table_lock_holder) override;
 
-    void mutate(const MutationCommands & commands, const Context & context) override;
+    void mutate(const MutationCommands & commands, ContextPtr context) override;
     void waitMutation(const String & znode_name, size_t mutations_sync) const;
     std::vector<MergeTreeMutationStatus> getMutationsStatus() const override;
     CancellationCode killMutation(const String & mutation_id) override;
@@ -137,7 +137,7 @@ public:
       */
     void drop() override;
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context & query_context, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr query_context, TableExclusiveLockHolder &) override;
 
     void checkTableCanBeRenamed() const override;
 
@@ -197,7 +197,7 @@ public:
         part_check_thread.enqueuePart(part_name, delay_to_check_seconds);
     }
 
-    CheckResults checkData(const ASTPtr & query, const Context & context) override;
+    CheckResults checkData(const ASTPtr & query, ContextPtr context) override;
 
     /// Checks ability to use granularity
     bool canUseAdaptiveGranularity() const override;
@@ -515,7 +515,7 @@ private:
 
     /// Exchange parts.
 
-    ConnectionTimeouts getFetchPartHTTPTimeouts(const Context & context);
+    ConnectionTimeouts getFetchPartHTTPTimeouts(ContextPtr context);
 
     /** Returns an empty string if no one has a part.
       */
@@ -617,14 +617,14 @@ private:
 
     bool dropPart(zkutil::ZooKeeperPtr & zookeeper, String part_name, LogEntry & entry, bool detach, bool throw_if_noop);
     bool dropAllPartsInPartition(
-        zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, const Context & query_context, bool detach);
+        zkutil::ZooKeeper & zookeeper, String & partition_id, LogEntry & entry, ContextPtr query_context, bool detach);
 
     // Partition helpers
-    void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, const Context & query_context, bool throw_if_noop) override;
-    PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, const Context & query_context) override;
-    void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, const Context & query_context) override;
-    void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, const Context & query_context) override;
-    void fetchPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, const String & from, const Context & query_context) override;
+    void dropPartition(const ASTPtr & partition, bool detach, bool drop_part, ContextPtr query_context, bool throw_if_noop) override;
+    PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, ContextPtr query_context) override;
+    void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr query_context) override;
+    void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr query_context) override;
+    void fetchPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, const String & from, ContextPtr query_context) override;
 
     /// Check granularity of already existing replicated table in zookeeper if it exists
     /// return true if it's fixed
@@ -638,9 +638,9 @@ private:
 
     void startBackgroundMovesIfNeeded() override;
 
-    std::set<String> getPartitionIdsAffectedByCommands(const MutationCommands & commands, const Context & query_context) const;
+    std::set<String> getPartitionIdsAffectedByCommands(const MutationCommands & commands, ContextPtr query_context) const;
     PartitionBlockNumbersHolder allocateBlockNumbersInAffectedPartitions(
-        const MutationCommands & commands, const Context & query_context, const zkutil::ZooKeeperPtr & zookeeper) const;
+        const MutationCommands & commands, ContextPtr query_context, const zkutil::ZooKeeperPtr & zookeeper) const;
 
 protected:
     /** If not 'attach', either creates a new table in ZK, or adds a replica to an existing table.
@@ -652,7 +652,7 @@ protected:
         const StorageID & table_id_,
         const String & relative_data_path_,
         const StorageInMemoryMetadata & metadata_,
-        Context & context_,
+        ContextPtr context_,
         const String & date_column_name,
         const MergingParams & merging_params_,
         std::unique_ptr<MergeTreeSettings> settings_,
diff --git a/src/Storages/StorageS3.cpp b/src/Storages/StorageS3.cpp
index 6a6a9b8b7b9..af4b1777223 100644
--- a/src/Storages/StorageS3.cpp
+++ b/src/Storages/StorageS3.cpp
@@ -69,7 +69,7 @@ namespace
             const String & format,
             String name_,
             const Block & sample_block,
-            const Context & context,
+            ContextPtr context,
             const ColumnsDescription & columns,
             UInt64 max_block_size,
             const CompressionMethod compression_method,
@@ -144,7 +144,7 @@ namespace
         StorageS3BlockOutputStream(
             const String & format,
             const Block & sample_block_,
-            const Context & context,
+            ContextPtr context,
             const CompressionMethod compression_method,
             const std::shared_ptr<Aws::S3::S3Client> & client,
             const String & bucket,
@@ -204,21 +204,21 @@ StorageS3::StorageS3(
     UInt64 max_connections_,
     const ColumnsDescription & columns_,
     const ConstraintsDescription & constraints_,
-    const Context & context_,
+    ContextPtr context_,
     const String & compression_method_)
     : IStorage(table_id_)
+    , WithContext(context_->getGlobalContext())
     , uri(uri_)
     , access_key_id(access_key_id_)
     , secret_access_key(secret_access_key_)
     , max_connections(max_connections_)
-    , global_context(context_.getGlobalContext())
     , format_name(format_name_)
     , min_upload_part_size(min_upload_part_size_)
     , max_single_part_upload_size(max_single_part_upload_size_)
     , compression_method(compression_method_)
     , name(uri_.storage_name)
 {
-    global_context.getRemoteHostFilter().checkURL(uri_.uri);
+    getContext()->getRemoteHostFilter().checkURL(uri_.uri);
     StorageInMemoryMetadata storage_metadata;
     storage_metadata.setColumns(columns_);
     storage_metadata.setConstraints(constraints_);
@@ -290,12 +290,12 @@ Pipe StorageS3::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
 {
-    updateAuthSettings(context);
+    updateAuthSettings(local_context);
 
     Pipes pipes;
     bool need_path_column = false;
@@ -315,7 +315,7 @@ Pipe StorageS3::read(
             format_name,
             getName(),
             metadata_snapshot->getSampleBlock(),
-            context,
+            local_context,
             metadata_snapshot->getColumns(),
             max_block_size,
             chooseCompressionMethod(uri.key, compression_method),
@@ -330,13 +330,13 @@ Pipe StorageS3::read(
     return pipe;
 }
 
-BlockOutputStreamPtr StorageS3::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageS3::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
-    updateAuthSettings(context);
+    updateAuthSettings(local_context);
     return std::make_shared<StorageS3BlockOutputStream>(
         format_name,
         metadata_snapshot->getSampleBlock(),
-        global_context,
+        getContext(),
         chooseCompressionMethod(uri.key, compression_method),
         client,
         uri.bucket,
@@ -345,9 +345,9 @@ BlockOutputStreamPtr StorageS3::write(const ASTPtr & /*query*/, const StorageMet
         max_single_part_upload_size);
 }
 
-void StorageS3::updateAuthSettings(const Context & context)
+void StorageS3::updateAuthSettings(ContextPtr local_context)
 {
-    auto settings = context.getStorageS3Settings().getSettings(uri.uri.toString());
+    auto settings = local_context->getStorageS3Settings().getSettings(uri.uri.toString());
     if (client && (!access_key_id.empty() || settings == auth_settings))
         return;
 
@@ -360,7 +360,7 @@ void StorageS3::updateAuthSettings(const Context & context)
     }
 
     S3::PocoHTTPClientConfiguration client_configuration = S3::ClientFactory::instance().createClientConfiguration(
-        context.getRemoteHostFilter(), context.getGlobalContext().getSettingsRef().s3_max_redirects);
+        local_context->getRemoteHostFilter(), local_context->getGlobalContext()->getSettingsRef().s3_max_redirects);
 
     client_configuration.endpointOverride = uri.endpoint;
     client_configuration.maxConnections = max_connections;
@@ -372,7 +372,7 @@ void StorageS3::updateAuthSettings(const Context & context)
         credentials.GetAWSSecretKey(),
         settings.server_side_encryption_customer_key_base64,
         std::move(headers),
-        settings.use_environment_credentials.value_or(global_context.getConfigRef().getBool("s3.use_environment_credentials", false)));
+        settings.use_environment_credentials.value_or(getContext()->getConfigRef().getBool("s3.use_environment_credentials", false)));
 
     auth_settings = std::move(settings);
 }
@@ -388,7 +388,7 @@ void registerStorageS3Impl(const String & name, StorageFactory & factory)
                 "Storage S3 requires 2 to 5 arguments: url, [access_key_id, secret_access_key], name of used format and [compression_method].", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         for (auto & engine_arg : engine_args)
-            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.local_context);
+            engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
 
         String url = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
         Poco::URI uri (url);
@@ -402,9 +402,9 @@ void registerStorageS3Impl(const String & name, StorageFactory & factory)
             secret_access_key = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
         }
 
-        UInt64 min_upload_part_size = args.local_context.getSettingsRef().s3_min_upload_part_size;
-        UInt64 max_single_part_upload_size = args.local_context.getSettingsRef().s3_max_single_part_upload_size;
-        UInt64 max_connections = args.local_context.getSettingsRef().s3_max_connections;
+        UInt64 min_upload_part_size = args.getLocalContext()->getSettingsRef().s3_min_upload_part_size;
+        UInt64 max_single_part_upload_size = args.getLocalContext()->getSettingsRef().s3_max_single_part_upload_size;
+        UInt64 max_connections = args.getLocalContext()->getSettingsRef().s3_max_connections;
 
         String compression_method;
         String format_name;
@@ -430,7 +430,7 @@ void registerStorageS3Impl(const String & name, StorageFactory & factory)
             max_connections,
             args.columns,
             args.constraints,
-            args.context,
+            args.getContext(),
             compression_method
         );
     },
diff --git a/src/Storages/StorageS3.h b/src/Storages/StorageS3.h
index 46d8c9276a2..14946f881f2 100644
--- a/src/Storages/StorageS3.h
+++ b/src/Storages/StorageS3.h
@@ -23,7 +23,7 @@ namespace DB
  * It sends HTTP GET to server when select is called and
  * HTTP PUT when insert is called.
  */
-class StorageS3 : public ext::shared_ptr_helper<StorageS3>, public IStorage
+class StorageS3 : public ext::shared_ptr_helper<StorageS3>, public IStorage, WithContext
 {
 public:
     StorageS3(const S3::URI & uri,
@@ -36,7 +36,7 @@ public:
         UInt64 max_connections_,
         const ColumnsDescription & columns_,
         const ConstraintsDescription & constraints_,
-        const Context & context_,
+        ContextPtr context_,
         const String & compression_method_ = "");
 
     String getName() const override
@@ -48,12 +48,12 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     NamesAndTypesList getVirtuals() const override;
 
@@ -62,7 +62,6 @@ private:
     const String access_key_id;
     const String secret_access_key;
     const UInt64 max_connections;
-    const Context & global_context;
 
     String format_name;
     size_t min_upload_part_size;
@@ -72,7 +71,7 @@ private:
     String name;
     S3AuthSettings auth_settings;
 
-    void updateAuthSettings(const Context & context);
+    void updateAuthSettings(ContextPtr context);
 };
 
 }
diff --git a/src/Storages/StorageSet.cpp b/src/Storages/StorageSet.cpp
index d64042f0c1e..34bbfed874f 100644
--- a/src/Storages/StorageSet.cpp
+++ b/src/Storages/StorageSet.cpp
@@ -99,7 +99,7 @@ void SetOrJoinBlockOutputStream::writeSuffix()
 }
 
 
-BlockOutputStreamPtr StorageSetOrJoinBase::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & /*context*/)
+BlockOutputStreamPtr StorageSetOrJoinBase::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/)
 {
     UInt64 id = ++increment;
     return std::make_shared<SetOrJoinBlockOutputStream>(*this, metadata_snapshot, path, path + "tmp/", toString(id) + ".bin", persistent);
@@ -156,7 +156,7 @@ size_t StorageSet::getSize() const { return set->getTotalRowCount(); }
 std::optional<UInt64> StorageSet::totalRows(const Settings &) const { return set->getTotalRowCount(); }
 std::optional<UInt64> StorageSet::totalBytes(const Settings &) const { return set->getTotalByteCount(); }
 
-void StorageSet::truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &)
+void StorageSet::truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &)
 {
     disk->removeRecursive(path);
     disk->createDirectories(path);
@@ -246,7 +246,7 @@ void registerStorageSet(StorageFactory & factory)
         if (has_settings)
             set_settings.loadFromQuery(*args.storage_def);
 
-        DiskPtr disk = args.context.getDisk(set_settings.disk);
+        DiskPtr disk = args.getContext()->getDisk(set_settings.disk);
         return StorageSet::create(disk, args.relative_data_path, args.table_id, args.columns, args.constraints, set_settings.persistent);
     }, StorageFactory::StorageFeatures{ .supports_settings = true, });
 }
diff --git a/src/Storages/StorageSet.h b/src/Storages/StorageSet.h
index 9b9078f7dd5..b87dcf21a23 100644
--- a/src/Storages/StorageSet.h
+++ b/src/Storages/StorageSet.h
@@ -23,7 +23,7 @@ class StorageSetOrJoinBase : public IStorage
 public:
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     bool storesDataOnDisk() const override { return true; }
     Strings getDataPaths() const override { return {path}; }
@@ -72,7 +72,7 @@ public:
     /// Access the insides.
     SetPtr & getSet() { return set; }
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
 
     std::optional<UInt64> totalRows(const Settings & settings) const override;
     std::optional<UInt64> totalBytes(const Settings & settings) const override;
diff --git a/src/Storages/StorageStripeLog.cpp b/src/Storages/StorageStripeLog.cpp
index f31e66281c8..d845dfb71f2 100644
--- a/src/Storages/StorageStripeLog.cpp
+++ b/src/Storages/StorageStripeLog.cpp
@@ -307,9 +307,9 @@ void StorageStripeLog::rename(const String & new_path_to_table_data, const Stora
 }
 
 
-static std::chrono::seconds getLockTimeout(const Context & context)
+static std::chrono::seconds getLockTimeout(ContextPtr context)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     Int64 lock_timeout = settings.lock_acquire_timeout.totalSeconds();
     if (settings.max_execution_time.totalSeconds() != 0 && settings.max_execution_time.totalSeconds() < lock_timeout)
         lock_timeout = settings.max_execution_time.totalSeconds();
@@ -321,7 +321,7 @@ Pipe StorageStripeLog::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     unsigned num_streams)
@@ -358,7 +358,7 @@ Pipe StorageStripeLog::read(
         std::advance(end, (stream + 1) * size / num_streams);
 
         pipes.emplace_back(std::make_shared<StripeLogSource>(
-            *this, metadata_snapshot, column_names, context.getSettingsRef().max_read_buffer_size, index, begin, end));
+            *this, metadata_snapshot, column_names, context->getSettingsRef().max_read_buffer_size, index, begin, end));
     }
 
     /// We do not keep read lock directly at the time of reading, because we read ranges of data that do not change.
@@ -367,7 +367,7 @@ Pipe StorageStripeLog::read(
 }
 
 
-BlockOutputStreamPtr StorageStripeLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageStripeLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr context)
 {
     std::unique_lock lock(rwlock, getLockTimeout(context));
     if (!lock)
@@ -377,7 +377,7 @@ BlockOutputStreamPtr StorageStripeLog::write(const ASTPtr & /*query*/, const Sto
 }
 
 
-CheckResults StorageStripeLog::checkData(const ASTPtr & /* query */, const Context & context)
+CheckResults StorageStripeLog::checkData(const ASTPtr & /* query */, ContextPtr context)
 {
     std::shared_lock lock(rwlock, getLockTimeout(context));
     if (!lock)
@@ -386,7 +386,7 @@ CheckResults StorageStripeLog::checkData(const ASTPtr & /* query */, const Conte
     return file_checker.check();
 }
 
-void StorageStripeLog::truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder &)
+void StorageStripeLog::truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder &)
 {
     disk->clearDirectory(table_path);
     file_checker = FileChecker{disk, table_path + "sizes.json"};
@@ -407,11 +407,11 @@ void registerStorageStripeLog(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         String disk_name = getDiskName(*args.storage_def);
-        DiskPtr disk = args.context.getDisk(disk_name);
+        DiskPtr disk = args.getContext()->getDisk(disk_name);
 
         return StorageStripeLog::create(
             disk, args.relative_data_path, args.table_id, args.columns, args.constraints,
-            args.attach, args.context.getSettings().max_compress_block_size);
+            args.attach, args.getContext()->getSettings().max_compress_block_size);
     }, features);
 }
 
diff --git a/src/Storages/StorageStripeLog.h b/src/Storages/StorageStripeLog.h
index 77fd12cd1aa..7fad94870dc 100644
--- a/src/Storages/StorageStripeLog.h
+++ b/src/Storages/StorageStripeLog.h
@@ -29,21 +29,21 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
 
-    CheckResults checkData(const ASTPtr & /* query */, const Context & /* context */) override;
+    CheckResults checkData(const ASTPtr & /* query */, ContextPtr /* context */) override;
 
     bool storesDataOnDisk() const override { return true; }
     Strings getDataPaths() const override { return {DB::fullPath(disk, table_path)}; }
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr &, const Context &, TableExclusiveLockHolder&) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr &, ContextPtr, TableExclusiveLockHolder&) override;
 
 protected:
     StorageStripeLog(
diff --git a/src/Storages/StorageTableFunction.h b/src/Storages/StorageTableFunction.h
index adb54d65bb4..7d909165d5f 100644
--- a/src/Storages/StorageTableFunction.h
+++ b/src/Storages/StorageTableFunction.h
@@ -73,7 +73,7 @@ public:
             const Names & column_names,
             const StorageMetadataPtr & metadata_snapshot,
             SelectQueryInfo & query_info,
-            const Context & context,
+            ContextPtr context,
             QueryProcessingStage::Enum processed_stage,
             size_t max_block_size,
             unsigned num_streams) override
@@ -96,7 +96,7 @@ public:
                     ActionsDAG::MatchColumnsMode::Name);
             auto convert_actions = std::make_shared<ExpressionActions>(
                 convert_actions_dag,
-                ExpressionActionsSettings::fromSettings(context.getSettingsRef()));
+                ExpressionActionsSettings::fromSettings(context->getSettingsRef()));
 
             pipe.addSimpleTransform([&](const Block & header)
             {
@@ -109,7 +109,7 @@ public:
     BlockOutputStreamPtr write(
             const ASTPtr & query,
             const StorageMetadataPtr & metadata_snapshot,
-            const Context & context) override
+            ContextPtr context) override
     {
         auto storage = getNested();
         auto cached_structure = metadata_snapshot->getSampleBlock();
diff --git a/src/Storages/StorageTinyLog.cpp b/src/Storages/StorageTinyLog.cpp
index b63a0c7d255..41c2961e929 100644
--- a/src/Storages/StorageTinyLog.cpp
+++ b/src/Storages/StorageTinyLog.cpp
@@ -465,9 +465,9 @@ void StorageTinyLog::rename(const String & new_path_to_table_data, const Storage
 }
 
 
-static std::chrono::seconds getLockTimeout(const Context & context)
+static std::chrono::seconds getLockTimeout(ContextPtr context)
 {
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
     Int64 lock_timeout = settings.lock_acquire_timeout.totalSeconds();
     if (settings.max_execution_time.totalSeconds() != 0 && settings.max_execution_time.totalSeconds() < lock_timeout)
         lock_timeout = settings.max_execution_time.totalSeconds();
@@ -479,7 +479,7 @@ Pipe StorageTinyLog::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t max_block_size,
     const unsigned /*num_streams*/)
@@ -490,7 +490,7 @@ Pipe StorageTinyLog::read(
 
     // When reading, we lock the entire storage, because we only have one file
     // per column and can't modify it concurrently.
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     std::shared_lock lock{rwlock, getLockTimeout(context)};
     if (!lock)
@@ -506,13 +506,13 @@ Pipe StorageTinyLog::read(
 }
 
 
-BlockOutputStreamPtr StorageTinyLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageTinyLog::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr context)
 {
     return std::make_shared<TinyLogBlockOutputStream>(*this, metadata_snapshot, std::unique_lock{rwlock, getLockTimeout(context)});
 }
 
 
-CheckResults StorageTinyLog::checkData(const ASTPtr & /* query */, const Context & context)
+CheckResults StorageTinyLog::checkData(const ASTPtr & /* query */, ContextPtr context)
 {
     std::shared_lock lock(rwlock, getLockTimeout(context));
     if (!lock)
@@ -522,7 +522,7 @@ CheckResults StorageTinyLog::checkData(const ASTPtr & /* query */, const Context
 }
 
 void StorageTinyLog::truncate(
-    const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &)
+    const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &)
 {
     disk->clearDirectory(table_path);
 
@@ -548,11 +548,11 @@ void registerStorageTinyLog(StorageFactory & factory)
                 ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
         String disk_name = getDiskName(*args.storage_def);
-        DiskPtr disk = args.context.getDisk(disk_name);
+        DiskPtr disk = args.getContext()->getDisk(disk_name);
 
         return StorageTinyLog::create(
             disk, args.relative_data_path, args.table_id, args.columns, args.constraints,
-            args.attach, args.context.getSettings().max_compress_block_size);
+            args.attach, args.getContext()->getSettings().max_compress_block_size);
     }, features);
 }
 
diff --git a/src/Storages/StorageTinyLog.h b/src/Storages/StorageTinyLog.h
index 1187f7f905d..01652169b62 100644
--- a/src/Storages/StorageTinyLog.h
+++ b/src/Storages/StorageTinyLog.h
@@ -28,22 +28,22 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     void rename(const String & new_path_to_table_data, const StorageID & new_table_id) override;
 
-    CheckResults checkData(const ASTPtr & /* query */, const Context & /* context */) override;
+    CheckResults checkData(const ASTPtr & /* query */, ContextPtr /* context */) override;
 
     bool storesDataOnDisk() const override { return true; }
     Strings getDataPaths() const override { return {DB::fullPath(disk, table_path)}; }
     bool supportsSubcolumns() const override { return true; }
 
-    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, const Context &, TableExclusiveLockHolder &) override;
+    void truncate(const ASTPtr &, const StorageMetadataPtr & metadata_snapshot, ContextPtr, TableExclusiveLockHolder &) override;
 
 protected:
     StorageTinyLog(
diff --git a/src/Storages/StorageURL.cpp b/src/Storages/StorageURL.cpp
index 2d3879340dc..8b6d7839de0 100644
--- a/src/Storages/StorageURL.cpp
+++ b/src/Storages/StorageURL.cpp
@@ -33,7 +33,7 @@ namespace ErrorCodes
 
 IStorageURLBase::IStorageURLBase(
     const Poco::URI & uri_,
-    const Context & /*context_*/,
+    ContextPtr /*context_*/,
     const StorageID & table_id_,
     const String & format_name_,
     const std::optional<FormatSettings> & format_settings_,
@@ -64,7 +64,7 @@ namespace
             const std::optional<FormatSettings> & format_settings,
             String name_,
             const Block & sample_block,
-            const Context & context,
+            ContextPtr context,
             const ColumnsDescription & columns,
             UInt64 max_block_size,
             const ConnectionTimeouts & timeouts,
@@ -96,11 +96,11 @@ namespace
                     method,
                     std::move(callback),
                     timeouts,
-                    context.getSettingsRef().max_http_get_redirects,
+                    context->getSettingsRef().max_http_get_redirects,
                     Poco::Net::HTTPBasicCredentials{},
                     DBMS_DEFAULT_BUFFER_SIZE,
                     header,
-                    context.getRemoteHostFilter()),
+                    context->getRemoteHostFilter()),
                 compression_method);
 
             auto input_format = FormatFactory::instance().getInput(format, *read_buf, sample_block, context, max_block_size, format_settings);
@@ -144,7 +144,7 @@ StorageURLBlockOutputStream::StorageURLBlockOutputStream(const Poco::URI & uri,
         const String & format,
         const std::optional<FormatSettings> & format_settings,
         const Block & sample_block_,
-        const Context & context,
+        ContextPtr context,
         const ConnectionTimeouts & timeouts,
         const CompressionMethod compression_method)
         : sample_block(sample_block_)
@@ -184,7 +184,7 @@ std::vector<std::pair<std::string, std::string>> IStorageURLBase::getReadURIPara
     const Names & /*column_names*/,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     const SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum & /*processed_stage*/,
     size_t /*max_block_size*/) const
 {
@@ -195,7 +195,7 @@ std::function<void(std::ostream &)> IStorageURLBase::getReadPOSTDataCallback(
     const Names & /*column_names*/,
     const StorageMetadataPtr & /*metadata_snapshot*/,
     const SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum & /*processed_stage*/,
     size_t /*max_block_size*/) const
 {
@@ -207,13 +207,13 @@ Pipe IStorageURLBase::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned /*num_streams*/)
 {
     auto request_uri = uri;
-    auto params = getReadURIParams(column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size);
+    auto params = getReadURIParams(column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size);
     for (const auto & [param, value] : params)
         request_uri.addQueryParameter(param, value);
 
@@ -222,19 +222,19 @@ Pipe IStorageURLBase::read(
         getReadMethod(),
         getReadPOSTDataCallback(
             column_names, metadata_snapshot, query_info,
-            context, processed_stage, max_block_size),
+            local_context, processed_stage, max_block_size),
         format_name,
         format_settings,
         getName(),
         getHeaderBlock(column_names, metadata_snapshot),
-        context,
+        local_context,
         metadata_snapshot->getColumns(),
         max_block_size,
-        ConnectionTimeouts::getHTTPTimeouts(context),
+        ConnectionTimeouts::getHTTPTimeouts(local_context),
         chooseCompressionMethod(request_uri.getPath(), compression_method)));
 }
 
-BlockOutputStreamPtr IStorageURLBase::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr IStorageURLBase::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr context)
 {
     return std::make_shared<StorageURLBlockOutputStream>(uri, format_name,
         format_settings, metadata_snapshot->getSampleBlock(), context,
@@ -248,12 +248,12 @@ StorageURL::StorageURL(const Poco::URI & uri_,
            const std::optional<FormatSettings> & format_settings_,
            const ColumnsDescription & columns_,
            const ConstraintsDescription & constraints_,
-           Context & context_,
+           ContextPtr context_,
            const String & compression_method_)
     : IStorageURLBase(uri_, context_, table_id_, format_name_,
                       format_settings_, columns_, constraints_, compression_method_)
 {
-    context_.getRemoteHostFilter().checkURL(uri);
+    context_->getRemoteHostFilter().checkURL(uri);
 }
 
 void registerStorageURL(StorageFactory & factory)
@@ -266,19 +266,19 @@ void registerStorageURL(StorageFactory & factory)
             throw Exception(
                 "Storage URL requires 2 or 3 arguments: url, name of used format and optional compression method.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
-        engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.local_context);
+        engine_args[0] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[0], args.getLocalContext());
 
         String url = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
         Poco::URI uri(url);
 
-        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.local_context);
+        engine_args[1] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[1], args.getLocalContext());
 
         String format_name = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
 
         String compression_method;
         if (engine_args.size() == 3)
         {
-            engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.local_context);
+            engine_args[2] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[2], args.getLocalContext());
             compression_method = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
         }
         else
@@ -296,7 +296,7 @@ void registerStorageURL(StorageFactory & factory)
 
             // Apply changed settings from global context, but ignore the
             // unknown ones, because we only have the format settings here.
-            const auto & changes = args.context.getSettingsRef().changes();
+            const auto & changes = args.getContext()->getSettingsRef().changes();
             for (const auto & change : changes)
             {
                 if (user_format_settings.has(change.name))
@@ -308,12 +308,12 @@ void registerStorageURL(StorageFactory & factory)
             // Apply changes from SETTINGS clause, with validation.
             user_format_settings.applyChanges(args.storage_def->settings->changes);
 
-            format_settings = getFormatSettings(args.context,
+            format_settings = getFormatSettings(args.getContext(),
                 user_format_settings);
         }
         else
         {
-            format_settings = getFormatSettings(args.context);
+            format_settings = getFormatSettings(args.getContext());
         }
 
         return StorageURL::create(
@@ -321,7 +321,7 @@ void registerStorageURL(StorageFactory & factory)
             args.table_id,
             format_name,
             format_settings,
-            args.columns, args.constraints, args.context,
+            args.columns, args.constraints, args.getContext(),
             compression_method);
     },
     {
diff --git a/src/Storages/StorageURL.h b/src/Storages/StorageURL.h
index 2b2384b1043..6fc1a6006ec 100644
--- a/src/Storages/StorageURL.h
+++ b/src/Storages/StorageURL.h
@@ -26,17 +26,17 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
 protected:
     IStorageURLBase(
         const Poco::URI & uri_,
-        const Context & context_,
+        ContextPtr context_,
         const StorageID & id_,
         const String & format_name_,
         const std::optional<FormatSettings> & format_settings_,
@@ -60,7 +60,7 @@ private:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size) const;
 
@@ -68,7 +68,7 @@ private:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size) const;
 
@@ -83,9 +83,9 @@ public:
         const String & format,
         const std::optional<FormatSettings> & format_settings,
         const Block & sample_block_,
-        const Context & context,
+        ContextPtr context,
         const ConnectionTimeouts & timeouts,
-        const CompressionMethod compression_method);
+        CompressionMethod compression_method);
 
     Block getHeader() const override
     {
@@ -112,7 +112,7 @@ public:
             const std::optional<FormatSettings> & format_settings_,
             const ColumnsDescription & columns_,
             const ConstraintsDescription & constraints_,
-            Context & context_,
+            ContextPtr context_,
             const String & compression_method_);
 
     String getName() const override
diff --git a/src/Storages/StorageValues.cpp b/src/Storages/StorageValues.cpp
index 500deac5f25..ace5ca3667c 100644
--- a/src/Storages/StorageValues.cpp
+++ b/src/Storages/StorageValues.cpp
@@ -24,7 +24,7 @@ Pipe StorageValues::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t /*max_block_size*/,
     unsigned /*num_streams*/)
diff --git a/src/Storages/StorageValues.h b/src/Storages/StorageValues.h
index 5729f245149..6ae33ed70f1 100644
--- a/src/Storages/StorageValues.h
+++ b/src/Storages/StorageValues.h
@@ -19,7 +19,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageView.cpp b/src/Storages/StorageView.cpp
index bcaf63152c1..75bd4b2967f 100644
--- a/src/Storages/StorageView.cpp
+++ b/src/Storages/StorageView.cpp
@@ -54,7 +54,7 @@ Pipe StorageView::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum processed_stage,
     const size_t max_block_size,
     const unsigned num_streams)
@@ -71,7 +71,7 @@ void StorageView::read(
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum /*processed_stage*/,
         const size_t /*max_block_size*/,
         const unsigned /*num_streams*/)
diff --git a/src/Storages/StorageView.h b/src/Storages/StorageView.h
index 6f894ce2775..fa11472218d 100644
--- a/src/Storages/StorageView.h
+++ b/src/Storages/StorageView.h
@@ -25,7 +25,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -35,7 +35,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/StorageXDBC.cpp b/src/Storages/StorageXDBC.cpp
index f2f8cdb23f5..c535f6977a6 100644
--- a/src/Storages/StorageXDBC.cpp
+++ b/src/Storages/StorageXDBC.cpp
@@ -28,7 +28,7 @@ StorageXDBC::StorageXDBC(
     const std::string & remote_database_name_,
     const std::string & remote_table_name_,
     const ColumnsDescription & columns_,
-    const Context & context_,
+    ContextPtr context_,
     const BridgeHelperPtr bridge_helper_)
     /// Please add support for constraints as soon as StorageODBC or JDBC will support insertion.
     : IStorageURLBase(Poco::URI(),
@@ -56,7 +56,7 @@ std::vector<std::pair<std::string, std::string>> StorageXDBC::getReadURIParams(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     const SelectQueryInfo & /*query_info*/,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum & /*processed_stage*/,
     size_t max_block_size) const
 {
@@ -73,7 +73,7 @@ std::function<void(std::ostream &)> StorageXDBC::getReadPOSTDataCallback(
     const Names & /*column_names*/,
     const StorageMetadataPtr & metadata_snapshot,
     const SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum & /*processed_stage*/,
     size_t /*max_block_size*/) const
 {
@@ -82,7 +82,7 @@ std::function<void(std::ostream &)> StorageXDBC::getReadPOSTDataCallback(
         bridge_helper->getIdentifierQuotingStyle(),
         remote_database_name,
         remote_table_name,
-        context);
+        local_context);
 
     return [query](std::ostream & os) { os << "query=" << query; };
 }
@@ -91,7 +91,7 @@ Pipe StorageXDBC::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr local_context,
     QueryProcessingStage::Enum processed_stage,
     size_t max_block_size,
     unsigned num_streams)
@@ -99,10 +99,10 @@ Pipe StorageXDBC::read(
     metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
 
     bridge_helper->startBridgeSync();
-    return IStorageURLBase::read(column_names, metadata_snapshot, query_info, context, processed_stage, max_block_size, num_streams);
+    return IStorageURLBase::read(column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
 }
 
-BlockOutputStreamPtr StorageXDBC::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, const Context & context)
+BlockOutputStreamPtr StorageXDBC::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
 {
     bridge_helper->startBridgeSync();
 
@@ -124,10 +124,10 @@ BlockOutputStreamPtr StorageXDBC::write(const ASTPtr & /*query*/, const StorageM
     return std::make_shared<StorageURLBlockOutputStream>(
         request_uri,
         format_name,
-        getFormatSettings(context),
+        getFormatSettings(local_context),
         metadata_snapshot->getSampleBlock(),
-        context,
-        ConnectionTimeouts::getHTTPTimeouts(context),
+        local_context,
+        ConnectionTimeouts::getHTTPTimeouts(local_context),
         chooseCompressionMethod(uri.toString(), compression_method));
 }
 
@@ -155,16 +155,16 @@ namespace
                     ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
 
             for (size_t i = 0; i < 3; ++i)
-                engine_args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[i], args.local_context);
+                engine_args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[i], args.getLocalContext());
 
-            BridgeHelperPtr bridge_helper = std::make_shared<XDBCBridgeHelper<BridgeHelperMixin>>(args.context,
-                args.context.getSettingsRef().http_receive_timeout.value,
+            BridgeHelperPtr bridge_helper = std::make_shared<XDBCBridgeHelper<BridgeHelperMixin>>(args.getContext(),
+                args.getContext()->getSettingsRef().http_receive_timeout.value,
                 engine_args[0]->as<ASTLiteral &>().value.safeGet<String>());
             return std::make_shared<StorageXDBC>(args.table_id,
                 engine_args[1]->as<ASTLiteral &>().value.safeGet<String>(),
                 engine_args[2]->as<ASTLiteral &>().value.safeGet<String>(),
                 args.columns,
-                args.context,
+                args.getContext(),
                 bridge_helper);
 
         },
diff --git a/src/Storages/StorageXDBC.h b/src/Storages/StorageXDBC.h
index 1708bfa561d..064912fda92 100644
--- a/src/Storages/StorageXDBC.h
+++ b/src/Storages/StorageXDBC.h
@@ -19,7 +19,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
@@ -29,10 +29,10 @@ public:
         const std::string & remote_database_name,
         const std::string & remote_table_name,
         const ColumnsDescription & columns_,
-        const Context & context_,
+        ContextPtr context_,
         BridgeHelperPtr bridge_helper_);
 
-    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
+    BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
 
     std::string getName() const override;
 private:
@@ -49,7 +49,7 @@ private:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size) const override;
 
@@ -57,7 +57,7 @@ private:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         const SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum & processed_stage,
         size_t max_block_size) const override;
 
diff --git a/src/Storages/System/IStorageSystemOneBlock.h b/src/Storages/System/IStorageSystemOneBlock.h
index d83a71c2592..36e92d5a1f4 100644
--- a/src/Storages/System/IStorageSystemOneBlock.h
+++ b/src/Storages/System/IStorageSystemOneBlock.h
@@ -18,7 +18,7 @@ template <typename Self>
 class IStorageSystemOneBlock : public IStorage
 {
 protected:
-    virtual void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const = 0;
+    virtual void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const = 0;
 
 public:
 #if defined(ARCADIA_BUILD)
@@ -36,7 +36,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum /*processed_stage*/,
         size_t /*max_block_size*/,
         unsigned /*num_streams*/) override
diff --git a/src/Storages/System/StorageSystemAggregateFunctionCombinators.cpp b/src/Storages/System/StorageSystemAggregateFunctionCombinators.cpp
index c0dd5cc85d3..c1de054ffcd 100644
--- a/src/Storages/System/StorageSystemAggregateFunctionCombinators.cpp
+++ b/src/Storages/System/StorageSystemAggregateFunctionCombinators.cpp
@@ -12,7 +12,7 @@ NamesAndTypesList StorageSystemAggregateFunctionCombinators::getNamesAndTypes()
     };
 }
 
-void StorageSystemAggregateFunctionCombinators::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemAggregateFunctionCombinators::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     const auto & combinators = AggregateFunctionCombinatorFactory::instance().getAllAggregateFunctionCombinators();
     for (const auto & pair : combinators)
diff --git a/src/Storages/System/StorageSystemAggregateFunctionCombinators.h b/src/Storages/System/StorageSystemAggregateFunctionCombinators.h
index 8d204020160..a978bfbface 100644
--- a/src/Storages/System/StorageSystemAggregateFunctionCombinators.h
+++ b/src/Storages/System/StorageSystemAggregateFunctionCombinators.h
@@ -12,7 +12,7 @@ class StorageSystemAggregateFunctionCombinators final : public ext::shared_ptr_h
 {
     friend struct ext::shared_ptr_helper<StorageSystemAggregateFunctionCombinators>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 public:
diff --git a/src/Storages/System/StorageSystemAsynchronousMetrics.cpp b/src/Storages/System/StorageSystemAsynchronousMetrics.cpp
index 8dabac4fb49..70e12440678 100644
--- a/src/Storages/System/StorageSystemAsynchronousMetrics.cpp
+++ b/src/Storages/System/StorageSystemAsynchronousMetrics.cpp
@@ -21,7 +21,7 @@ StorageSystemAsynchronousMetrics::StorageSystemAsynchronousMetrics(const Storage
 {
 }
 
-void StorageSystemAsynchronousMetrics::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemAsynchronousMetrics::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     auto async_metrics_values = async_metrics.getValues();
     for (const auto & name_value : async_metrics_values)
diff --git a/src/Storages/System/StorageSystemAsynchronousMetrics.h b/src/Storages/System/StorageSystemAsynchronousMetrics.h
index a2a92d248d8..eee029bbe51 100644
--- a/src/Storages/System/StorageSystemAsynchronousMetrics.h
+++ b/src/Storages/System/StorageSystemAsynchronousMetrics.h
@@ -33,7 +33,7 @@ protected:
 #endif
     StorageSystemAsynchronousMetrics(const StorageID & table_id_, const AsynchronousMetrics & async_metrics_);
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemBuildOptions.cpp b/src/Storages/System/StorageSystemBuildOptions.cpp
index a63afcf4ce5..01a60a0235c 100644
--- a/src/Storages/System/StorageSystemBuildOptions.cpp
+++ b/src/Storages/System/StorageSystemBuildOptions.cpp
@@ -16,7 +16,7 @@ NamesAndTypesList StorageSystemBuildOptions::getNamesAndTypes()
     };
 }
 
-void StorageSystemBuildOptions::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemBuildOptions::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
 #if !defined(ARCADIA_BUILD)
     for (auto * it = auto_config_build; *it; it += 2)
diff --git a/src/Storages/System/StorageSystemBuildOptions.h b/src/Storages/System/StorageSystemBuildOptions.h
index afd27f00bcc..8a22a3dcb45 100644
--- a/src/Storages/System/StorageSystemBuildOptions.h
+++ b/src/Storages/System/StorageSystemBuildOptions.h
@@ -16,7 +16,7 @@ class StorageSystemBuildOptions final : public ext::shared_ptr_helper<StorageSys
 {
     friend struct ext::shared_ptr_helper<StorageSystemBuildOptions>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemClusters.cpp b/src/Storages/System/StorageSystemClusters.cpp
index e20ce233190..8a3227aafdb 100644
--- a/src/Storages/System/StorageSystemClusters.cpp
+++ b/src/Storages/System/StorageSystemClusters.cpp
@@ -29,9 +29,9 @@ NamesAndTypesList StorageSystemClusters::getNamesAndTypes()
 }
 
 
-void StorageSystemClusters::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemClusters::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    for (const auto & name_and_cluster : context.getClusters().getContainer())
+    for (const auto & name_and_cluster : context->getClusters().getContainer())
         writeCluster(res_columns, name_and_cluster);
 
     const auto databases = DatabaseCatalog::instance().getDatabases();
diff --git a/src/Storages/System/StorageSystemClusters.h b/src/Storages/System/StorageSystemClusters.h
index 4f2a843999f..81aefaff1c4 100644
--- a/src/Storages/System/StorageSystemClusters.h
+++ b/src/Storages/System/StorageSystemClusters.h
@@ -28,7 +28,7 @@ protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
     using NameAndCluster = std::pair<String, std::shared_ptr<Cluster>>;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
     static void writeCluster(MutableColumns & res_columns, const NameAndCluster & name_and_cluster);
 };
 
diff --git a/src/Storages/System/StorageSystemCollations.cpp b/src/Storages/System/StorageSystemCollations.cpp
index a870a7c7c78..c9343ccd146 100644
--- a/src/Storages/System/StorageSystemCollations.cpp
+++ b/src/Storages/System/StorageSystemCollations.cpp
@@ -13,7 +13,7 @@ NamesAndTypesList StorageSystemCollations::getNamesAndTypes()
     };
 }
 
-void StorageSystemCollations::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemCollations::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (const auto & [locale, lang]: AvailableCollationLocales::instance().getAvailableCollations())
     {
diff --git a/src/Storages/System/StorageSystemCollations.h b/src/Storages/System/StorageSystemCollations.h
index 133acd937a1..454fd968511 100644
--- a/src/Storages/System/StorageSystemCollations.h
+++ b/src/Storages/System/StorageSystemCollations.h
@@ -10,7 +10,7 @@ class StorageSystemCollations final : public ext::shared_ptr_helper<StorageSyste
 {
     friend struct ext::shared_ptr_helper<StorageSystemCollations>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 public:
diff --git a/src/Storages/System/StorageSystemColumns.cpp b/src/Storages/System/StorageSystemColumns.cpp
index 6726d502071..8f65147bb11 100644
--- a/src/Storages/System/StorageSystemColumns.cpp
+++ b/src/Storages/System/StorageSystemColumns.cpp
@@ -65,12 +65,12 @@ public:
         ColumnPtr databases_,
         ColumnPtr tables_,
         Storages storages_,
-        const Context & context)
+        ContextPtr context)
         : SourceWithProgress(header_)
         , columns_mask(std::move(columns_mask_)), max_block_size(max_block_size_)
         , databases(std::move(databases_)), tables(std::move(tables_)), storages(std::move(storages_))
-        , total_tables(tables->size()), access(context.getAccess())
-        , query_id(context.getCurrentQueryId()), lock_acquire_timeout(context.getSettingsRef().lock_acquire_timeout)
+        , total_tables(tables->size()), access(context->getAccess())
+        , query_id(context->getCurrentQueryId()), lock_acquire_timeout(context->getSettingsRef().lock_acquire_timeout)
     {
     }
 
@@ -243,7 +243,7 @@ Pipe StorageSystemColumns::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t max_block_size,
     const unsigned /*num_streams*/)
@@ -289,9 +289,9 @@ Pipe StorageSystemColumns::read(
         }
 
         Tables external_tables;
-        if (context.hasSessionContext())
+        if (context->hasSessionContext())
         {
-            external_tables = context.getSessionContext().getExternalTables();
+            external_tables = context->getSessionContext()->getExternalTables();
             if (!external_tables.empty())
                 database_column_mut->insertDefault(); /// Empty database for external tables.
         }
diff --git a/src/Storages/System/StorageSystemColumns.h b/src/Storages/System/StorageSystemColumns.h
index c4f35485612..5cd8c5b38fd 100644
--- a/src/Storages/System/StorageSystemColumns.h
+++ b/src/Storages/System/StorageSystemColumns.h
@@ -21,7 +21,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemContributors.cpp b/src/Storages/System/StorageSystemContributors.cpp
index cd0f31975cc..ed28be2a4ab 100644
--- a/src/Storages/System/StorageSystemContributors.cpp
+++ b/src/Storages/System/StorageSystemContributors.cpp
@@ -16,7 +16,7 @@ NamesAndTypesList StorageSystemContributors::getNamesAndTypes()
     };
 }
 
-void StorageSystemContributors::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemContributors::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     std::vector<const char *> contributors;
     for (auto * it = auto_contributors; *it; ++it)
diff --git a/src/Storages/System/StorageSystemContributors.h b/src/Storages/System/StorageSystemContributors.h
index 0fd77f78655..c4a50263c5b 100644
--- a/src/Storages/System/StorageSystemContributors.h
+++ b/src/Storages/System/StorageSystemContributors.h
@@ -16,7 +16,7 @@ class StorageSystemContributors final : public ext::shared_ptr_helper<StorageSys
 {
     friend struct ext::shared_ptr_helper<StorageSystemContributors>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemCurrentRoles.cpp b/src/Storages/System/StorageSystemCurrentRoles.cpp
index b0667f2f3ca..a5b3566f5f7 100644
--- a/src/Storages/System/StorageSystemCurrentRoles.cpp
+++ b/src/Storages/System/StorageSystemCurrentRoles.cpp
@@ -22,10 +22,10 @@ NamesAndTypesList StorageSystemCurrentRoles::getNamesAndTypes()
 }
 
 
-void StorageSystemCurrentRoles::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemCurrentRoles::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    auto roles_info = context.getRolesInfo();
-    auto user = context.getUser();
+    auto roles_info = context->getRolesInfo();
+    auto user = context->getUser();
     if (!roles_info || !user)
         return;
 
diff --git a/src/Storages/System/StorageSystemCurrentRoles.h b/src/Storages/System/StorageSystemCurrentRoles.h
index 807db661371..77ab95547fa 100644
--- a/src/Storages/System/StorageSystemCurrentRoles.h
+++ b/src/Storages/System/StorageSystemCurrentRoles.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemCurrentRoles>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemDDLWorkerQueue.cpp b/src/Storages/System/StorageSystemDDLWorkerQueue.cpp
index 04321544f5d..98b15bfa6e2 100644
--- a/src/Storages/System/StorageSystemDDLWorkerQueue.cpp
+++ b/src/Storages/System/StorageSystemDDLWorkerQueue.cpp
@@ -95,7 +95,7 @@ NamesAndTypesList StorageSystemDDLWorkerQueue::getNamesAndTypes()
     };
 }
 
-static String clusterNameFromDDLQuery(const Context & context, const DDLLogEntry & entry)
+static String clusterNameFromDDLQuery(ContextPtr context, const DDLLogEntry & entry)
 {
     const char * begin = entry.query.data();
     const char * end = begin + entry.query.size();
@@ -104,15 +104,15 @@ static String clusterNameFromDDLQuery(const Context & context, const DDLLogEntry
     String cluster_name;
     ParserQuery parser_query(end);
     String description;
-    query = parseQuery(parser_query, begin, end, description, 0, context.getSettingsRef().max_parser_depth);
+    query = parseQuery(parser_query, begin, end, description, 0, context->getSettingsRef().max_parser_depth);
     if (query && (query_on_cluster = dynamic_cast<ASTQueryWithOnCluster *>(query.get())))
         cluster_name = query_on_cluster->cluster;
     return cluster_name;
 }
 
-void StorageSystemDDLWorkerQueue::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemDDLWorkerQueue::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    zkutil::ZooKeeperPtr zookeeper = context.getZooKeeper();
+    zkutil::ZooKeeperPtr zookeeper = context->getZooKeeper();
     Coordination::Error zk_exception_code = Coordination::Error::ZOK;
     String ddl_zookeeper_path = config.getString("distributed_ddl.path", "/clickhouse/task_queue/ddl/");
     String ddl_query_path;
@@ -130,7 +130,7 @@ void StorageSystemDDLWorkerQueue::fillData(MutableColumns & res_columns, const C
     if (code != Coordination::Error::ZOK && code != Coordination::Error::ZNONODE)
         zk_exception_code = code;
 
-    const auto & clusters = context.getClusters();
+    const auto & clusters = context->getClusters();
     for (const auto & name_and_cluster : clusters.getContainer())
     {
         const ClusterPtr & cluster = name_and_cluster.second;
diff --git a/src/Storages/System/StorageSystemDDLWorkerQueue.h b/src/Storages/System/StorageSystemDDLWorkerQueue.h
index 9326d4dcb26..d1afa2d546a 100644
--- a/src/Storages/System/StorageSystemDDLWorkerQueue.h
+++ b/src/Storages/System/StorageSystemDDLWorkerQueue.h
@@ -22,7 +22,7 @@ class StorageSystemDDLWorkerQueue final : public ext::shared_ptr_helper<StorageS
     Poco::Util::LayeredConfiguration & config = Poco::Util::Application::instance().config();
 
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemDataTypeFamilies.cpp b/src/Storages/System/StorageSystemDataTypeFamilies.cpp
index 0957e8f8349..c34589d85b1 100644
--- a/src/Storages/System/StorageSystemDataTypeFamilies.cpp
+++ b/src/Storages/System/StorageSystemDataTypeFamilies.cpp
@@ -16,7 +16,7 @@ NamesAndTypesList StorageSystemDataTypeFamilies::getNamesAndTypes()
     };
 }
 
-void StorageSystemDataTypeFamilies::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemDataTypeFamilies::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     const auto & factory = DataTypeFactory::instance();
     auto names = factory.getAllRegisteredNames();
diff --git a/src/Storages/System/StorageSystemDataTypeFamilies.h b/src/Storages/System/StorageSystemDataTypeFamilies.h
index 2a89ae77647..4de2ed99252 100644
--- a/src/Storages/System/StorageSystemDataTypeFamilies.h
+++ b/src/Storages/System/StorageSystemDataTypeFamilies.h
@@ -11,7 +11,7 @@ class StorageSystemDataTypeFamilies final : public ext::shared_ptr_helper<Storag
 {
     friend struct ext::shared_ptr_helper<StorageSystemDataTypeFamilies>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemDatabases.cpp b/src/Storages/System/StorageSystemDatabases.cpp
index 88ac987014d..e09e47d8baf 100644
--- a/src/Storages/System/StorageSystemDatabases.cpp
+++ b/src/Storages/System/StorageSystemDatabases.cpp
@@ -20,9 +20,9 @@ NamesAndTypesList StorageSystemDatabases::getNamesAndTypes()
     };
 }
 
-void StorageSystemDatabases::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemDatabases::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_DATABASES);
 
     const auto databases = DatabaseCatalog::instance().getDatabases();
@@ -36,7 +36,7 @@ void StorageSystemDatabases::fillData(MutableColumns & res_columns, const Contex
 
         res_columns[0]->insert(database_name);
         res_columns[1]->insert(database->getEngineName());
-        res_columns[2]->insert(context.getPath() + database->getDataPath());
+        res_columns[2]->insert(context->getPath() + database->getDataPath());
         res_columns[3]->insert(database->getMetadataPath());
         res_columns[4]->insert(database->getUUID());
    }
diff --git a/src/Storages/System/StorageSystemDatabases.h b/src/Storages/System/StorageSystemDatabases.h
index fe517c0f651..33f91fee837 100644
--- a/src/Storages/System/StorageSystemDatabases.h
+++ b/src/Storages/System/StorageSystemDatabases.h
@@ -26,7 +26,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemDetachedParts.cpp b/src/Storages/System/StorageSystemDetachedParts.cpp
index f96566026b1..56644620f97 100644
--- a/src/Storages/System/StorageSystemDetachedParts.cpp
+++ b/src/Storages/System/StorageSystemDetachedParts.cpp
@@ -33,7 +33,7 @@ Pipe StorageSystemDetachedParts::read(
     const Names & /* column_names */,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
diff --git a/src/Storages/System/StorageSystemDetachedParts.h b/src/Storages/System/StorageSystemDetachedParts.h
index 4c6970dadd6..18a6f5576d6 100644
--- a/src/Storages/System/StorageSystemDetachedParts.h
+++ b/src/Storages/System/StorageSystemDetachedParts.h
@@ -26,7 +26,7 @@ protected:
             const Names & /* column_names */,
             const StorageMetadataPtr & metadata_snapshot,
             SelectQueryInfo & query_info,
-            const Context & context,
+            ContextPtr context,
             QueryProcessingStage::Enum /*processed_stage*/,
             const size_t /*max_block_size*/,
             const unsigned /*num_streams*/) override;
diff --git a/src/Storages/System/StorageSystemDictionaries.cpp b/src/Storages/System/StorageSystemDictionaries.cpp
index 378905b7dc0..a362e6a44e3 100644
--- a/src/Storages/System/StorageSystemDictionaries.cpp
+++ b/src/Storages/System/StorageSystemDictionaries.cpp
@@ -50,12 +50,12 @@ NamesAndTypesList StorageSystemDictionaries::getNamesAndTypes()
     };
 }
 
-void StorageSystemDictionaries::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & /*query_info*/) const
+void StorageSystemDictionaries::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & /*query_info*/) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_dictionaries = !access->isGranted(AccessType::SHOW_DICTIONARIES);
 
-    const auto & external_dictionaries = context.getExternalDictionariesLoader();
+    const auto & external_dictionaries = context->getExternalDictionariesLoader();
     for (const auto & load_result : external_dictionaries.getLoadResults())
     {
         const auto dict_ptr = std::dynamic_pointer_cast<const IDictionary>(load_result.object);
diff --git a/src/Storages/System/StorageSystemDictionaries.h b/src/Storages/System/StorageSystemDictionaries.h
index 5139ce3c5f6..63b33adaaff 100644
--- a/src/Storages/System/StorageSystemDictionaries.h
+++ b/src/Storages/System/StorageSystemDictionaries.h
@@ -21,7 +21,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemDisks.cpp b/src/Storages/System/StorageSystemDisks.cpp
index b04d24cc705..5d7628acb2a 100644
--- a/src/Storages/System/StorageSystemDisks.cpp
+++ b/src/Storages/System/StorageSystemDisks.cpp
@@ -30,7 +30,7 @@ Pipe StorageSystemDisks::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
@@ -44,7 +44,7 @@ Pipe StorageSystemDisks::read(
     MutableColumnPtr col_keep = ColumnUInt64::create();
     MutableColumnPtr col_type = ColumnString::create();
 
-    for (const auto & [disk_name, disk_ptr] : context.getDisksMap())
+    for (const auto & [disk_name, disk_ptr] : context->getDisksMap())
     {
         col_name->insert(disk_name);
         col_path->insert(disk_ptr->getPath());
diff --git a/src/Storages/System/StorageSystemDisks.h b/src/Storages/System/StorageSystemDisks.h
index cff05242019..fa0f6fe4b8a 100644
--- a/src/Storages/System/StorageSystemDisks.h
+++ b/src/Storages/System/StorageSystemDisks.h
@@ -24,7 +24,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemDistributionQueue.cpp b/src/Storages/System/StorageSystemDistributionQueue.cpp
index db649e7e1ba..9c0f8818011 100644
--- a/src/Storages/System/StorageSystemDistributionQueue.cpp
+++ b/src/Storages/System/StorageSystemDistributionQueue.cpp
@@ -103,9 +103,9 @@ NamesAndTypesList StorageSystemDistributionQueue::getNamesAndTypes()
 }
 
 
-void StorageSystemDistributionQueue::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const
+void StorageSystemDistributionQueue::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
 
     std::map<String, std::map<String, StoragePtr>> tables;
diff --git a/src/Storages/System/StorageSystemDistributionQueue.h b/src/Storages/System/StorageSystemDistributionQueue.h
index 88e7fa45cf5..9314418d242 100644
--- a/src/Storages/System/StorageSystemDistributionQueue.h
+++ b/src/Storages/System/StorageSystemDistributionQueue.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemEnabledRoles.cpp b/src/Storages/System/StorageSystemEnabledRoles.cpp
index 27a42ca6f8b..99370dd647d 100644
--- a/src/Storages/System/StorageSystemEnabledRoles.cpp
+++ b/src/Storages/System/StorageSystemEnabledRoles.cpp
@@ -23,10 +23,10 @@ NamesAndTypesList StorageSystemEnabledRoles::getNamesAndTypes()
 }
 
 
-void StorageSystemEnabledRoles::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemEnabledRoles::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    auto roles_info = context.getRolesInfo();
-    auto user = context.getUser();
+    auto roles_info = context->getRolesInfo();
+    auto user = context->getUser();
     if (!roles_info || !user)
         return;
 
diff --git a/src/Storages/System/StorageSystemEnabledRoles.h b/src/Storages/System/StorageSystemEnabledRoles.h
index 18df31c646a..13b0533b790 100644
--- a/src/Storages/System/StorageSystemEnabledRoles.h
+++ b/src/Storages/System/StorageSystemEnabledRoles.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemEnabledRoles>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemErrors.cpp b/src/Storages/System/StorageSystemErrors.cpp
index 09d0aaddb3d..d08ffd730ac 100644
--- a/src/Storages/System/StorageSystemErrors.cpp
+++ b/src/Storages/System/StorageSystemErrors.cpp
@@ -23,11 +23,11 @@ NamesAndTypesList StorageSystemErrors::getNamesAndTypes()
 }
 
 
-void StorageSystemErrors::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemErrors::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
     auto add_row = [&](std::string_view name, size_t code, const auto & error, bool remote)
     {
-        if (error.count || context.getSettingsRef().system_events_show_zero_values)
+        if (error.count || context->getSettingsRef().system_events_show_zero_values)
         {
             size_t col_num = 0;
             res_columns[col_num++]->insert(name);
diff --git a/src/Storages/System/StorageSystemErrors.h b/src/Storages/System/StorageSystemErrors.h
index 569a7a998b7..ff3af11d251 100644
--- a/src/Storages/System/StorageSystemErrors.h
+++ b/src/Storages/System/StorageSystemErrors.h
@@ -25,7 +25,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemEvents.cpp b/src/Storages/System/StorageSystemEvents.cpp
index ddb00659473..be2d3f8d49e 100644
--- a/src/Storages/System/StorageSystemEvents.cpp
+++ b/src/Storages/System/StorageSystemEvents.cpp
@@ -16,13 +16,13 @@ NamesAndTypesList StorageSystemEvents::getNamesAndTypes()
     };
 }
 
-void StorageSystemEvents::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemEvents::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
     for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
     {
         UInt64 value = ProfileEvents::global_counters[i];
 
-        if (0 != value || context.getSettingsRef().system_events_show_zero_values)
+        if (0 != value || context->getSettingsRef().system_events_show_zero_values)
         {
             res_columns[0]->insert(ProfileEvents::getName(ProfileEvents::Event(i)));
             res_columns[1]->insert(value);
diff --git a/src/Storages/System/StorageSystemEvents.h b/src/Storages/System/StorageSystemEvents.h
index f1687e42233..6071cb7b2b3 100644
--- a/src/Storages/System/StorageSystemEvents.h
+++ b/src/Storages/System/StorageSystemEvents.h
@@ -22,7 +22,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemFormats.cpp b/src/Storages/System/StorageSystemFormats.cpp
index 7048ab98a0d..86e0212a523 100644
--- a/src/Storages/System/StorageSystemFormats.cpp
+++ b/src/Storages/System/StorageSystemFormats.cpp
@@ -15,7 +15,7 @@ NamesAndTypesList StorageSystemFormats::getNamesAndTypes()
     };
 }
 
-void StorageSystemFormats::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemFormats::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     const auto & formats = FormatFactory::instance().getAllFormats();
     for (const auto & pair : formats)
diff --git a/src/Storages/System/StorageSystemFormats.h b/src/Storages/System/StorageSystemFormats.h
index f90839e44e9..ed65cd2af88 100644
--- a/src/Storages/System/StorageSystemFormats.h
+++ b/src/Storages/System/StorageSystemFormats.h
@@ -9,7 +9,7 @@ class StorageSystemFormats final : public ext::shared_ptr_helper<StorageSystemFo
 {
     friend struct ext::shared_ptr_helper<StorageSystemFormats>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 public:
diff --git a/src/Storages/System/StorageSystemFunctions.cpp b/src/Storages/System/StorageSystemFunctions.cpp
index e46b7007dc2..973bf493cd1 100644
--- a/src/Storages/System/StorageSystemFunctions.cpp
+++ b/src/Storages/System/StorageSystemFunctions.cpp
@@ -34,7 +34,7 @@ NamesAndTypesList StorageSystemFunctions::getNamesAndTypes()
     };
 }
 
-void StorageSystemFunctions::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemFunctions::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     const auto & functions_factory = FunctionFactory::instance();
     const auto & function_names = functions_factory.getAllRegisteredNames();
diff --git a/src/Storages/System/StorageSystemFunctions.h b/src/Storages/System/StorageSystemFunctions.h
index f62d731f288..62942721995 100644
--- a/src/Storages/System/StorageSystemFunctions.h
+++ b/src/Storages/System/StorageSystemFunctions.h
@@ -24,7 +24,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemGrants.cpp b/src/Storages/System/StorageSystemGrants.cpp
index 0c06ad99b22..1ba5e6d96a4 100644
--- a/src/Storages/System/StorageSystemGrants.cpp
+++ b/src/Storages/System/StorageSystemGrants.cpp
@@ -35,10 +35,10 @@ NamesAndTypesList StorageSystemGrants::getNamesAndTypes()
 }
 
 
-void StorageSystemGrants::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemGrants::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_USERS | AccessType::SHOW_ROLES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_USERS | AccessType::SHOW_ROLES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<User>();
     boost::range::push_back(ids, access_control.findAll<Role>());
 
diff --git a/src/Storages/System/StorageSystemGrants.h b/src/Storages/System/StorageSystemGrants.h
index 39c38deed85..8c8a0f9f7bf 100644
--- a/src/Storages/System/StorageSystemGrants.h
+++ b/src/Storages/System/StorageSystemGrants.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemGrants>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemGraphite.cpp b/src/Storages/System/StorageSystemGraphite.cpp
index 93bc16785b2..dd592600d18 100644
--- a/src/Storages/System/StorageSystemGraphite.cpp
+++ b/src/Storages/System/StorageSystemGraphite.cpp
@@ -25,7 +25,7 @@ NamesAndTypesList StorageSystemGraphite::getNamesAndTypes()
 /*
  * Looking for (Replicated)*GraphiteMergeTree and get all configuration parameters for them
  */
-static StorageSystemGraphite::Configs getConfigs(const Context & context)
+static StorageSystemGraphite::Configs getConfigs(ContextPtr context)
 {
     const Databases databases = DatabaseCatalog::instance().getDatabases();
     StorageSystemGraphite::Configs graphite_configs;
@@ -73,7 +73,7 @@ static StorageSystemGraphite::Configs getConfigs(const Context & context)
     return graphite_configs;
 }
 
-void StorageSystemGraphite::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemGraphite::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
     Configs graphite_configs = getConfigs(context);
 
diff --git a/src/Storages/System/StorageSystemGraphite.h b/src/Storages/System/StorageSystemGraphite.h
index 703db41dc39..256ad50e472 100644
--- a/src/Storages/System/StorageSystemGraphite.h
+++ b/src/Storages/System/StorageSystemGraphite.h
@@ -32,7 +32,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemLicenses.cpp b/src/Storages/System/StorageSystemLicenses.cpp
index 894c861de29..6f880f03e10 100644
--- a/src/Storages/System/StorageSystemLicenses.cpp
+++ b/src/Storages/System/StorageSystemLicenses.cpp
@@ -18,7 +18,7 @@ NamesAndTypesList StorageSystemLicenses::getNamesAndTypes()
     };
 }
 
-void StorageSystemLicenses::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemLicenses::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (const auto * it = library_licenses; *it; it += 4)
     {
diff --git a/src/Storages/System/StorageSystemLicenses.h b/src/Storages/System/StorageSystemLicenses.h
index cee48abacab..43bb1c20c22 100644
--- a/src/Storages/System/StorageSystemLicenses.h
+++ b/src/Storages/System/StorageSystemLicenses.h
@@ -17,7 +17,7 @@ class StorageSystemLicenses final :
 {
     friend struct ext::shared_ptr_helper<StorageSystemLicenses>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemMacros.cpp b/src/Storages/System/StorageSystemMacros.cpp
index 8e6420add8b..576fbc69039 100644
--- a/src/Storages/System/StorageSystemMacros.cpp
+++ b/src/Storages/System/StorageSystemMacros.cpp
@@ -14,9 +14,9 @@ NamesAndTypesList StorageSystemMacros::getNamesAndTypes()
     };
 }
 
-void StorageSystemMacros::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemMacros::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    auto macros = context.getMacros();
+    auto macros = context->getMacros();
 
     for (const auto & macro : macros->getMacroMap())
     {
diff --git a/src/Storages/System/StorageSystemMacros.h b/src/Storages/System/StorageSystemMacros.h
index 52336bd6f69..298aa488265 100644
--- a/src/Storages/System/StorageSystemMacros.h
+++ b/src/Storages/System/StorageSystemMacros.h
@@ -24,7 +24,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemMergeTreeSettings.cpp b/src/Storages/System/StorageSystemMergeTreeSettings.cpp
index 19cbf76f252..626319af63f 100644
--- a/src/Storages/System/StorageSystemMergeTreeSettings.cpp
+++ b/src/Storages/System/StorageSystemMergeTreeSettings.cpp
@@ -20,9 +20,9 @@ NamesAndTypesList SystemMergeTreeSettings<replicated>::getNamesAndTypes()
 }
 
 template <bool replicated>
-void SystemMergeTreeSettings<replicated>::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void SystemMergeTreeSettings<replicated>::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto & settings = replicated ? context.getReplicatedMergeTreeSettings().all() : context.getMergeTreeSettings().all();
+    const auto & settings = replicated ? context->getReplicatedMergeTreeSettings().all() : context->getMergeTreeSettings().all();
     for (const auto & setting : settings)
     {
         res_columns[0]->insert(setting.getName());
diff --git a/src/Storages/System/StorageSystemMergeTreeSettings.h b/src/Storages/System/StorageSystemMergeTreeSettings.h
index 9f61fa6f780..b02b191fb69 100644
--- a/src/Storages/System/StorageSystemMergeTreeSettings.h
+++ b/src/Storages/System/StorageSystemMergeTreeSettings.h
@@ -28,7 +28,7 @@ public:
 protected:
     using IStorageSystemOneBlock<SystemMergeTreeSettings<replicated>>::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemMerges.cpp b/src/Storages/System/StorageSystemMerges.cpp
index b61324818e4..b29836206d0 100644
--- a/src/Storages/System/StorageSystemMerges.cpp
+++ b/src/Storages/System/StorageSystemMerges.cpp
@@ -36,12 +36,12 @@ NamesAndTypesList StorageSystemMerges::getNamesAndTypes()
 }
 
 
-void StorageSystemMerges::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemMerges::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_tables = !access->isGranted(AccessType::SHOW_TABLES);
 
-    for (const auto & merge : context.getMergeList().get())
+    for (const auto & merge : context->getMergeList().get())
     {
         if (check_access_for_tables && !access->isGranted(AccessType::SHOW_TABLES, merge.database, merge.table))
             continue;
diff --git a/src/Storages/System/StorageSystemMerges.h b/src/Storages/System/StorageSystemMerges.h
index 81c03c4e397..5898bf62825 100644
--- a/src/Storages/System/StorageSystemMerges.h
+++ b/src/Storages/System/StorageSystemMerges.h
@@ -24,7 +24,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemMetrics.cpp b/src/Storages/System/StorageSystemMetrics.cpp
index b2332c52817..6007c8a7c71 100644
--- a/src/Storages/System/StorageSystemMetrics.cpp
+++ b/src/Storages/System/StorageSystemMetrics.cpp
@@ -17,7 +17,7 @@ NamesAndTypesList StorageSystemMetrics::getNamesAndTypes()
     };
 }
 
-void StorageSystemMetrics::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemMetrics::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
     {
diff --git a/src/Storages/System/StorageSystemMetrics.h b/src/Storages/System/StorageSystemMetrics.h
index c47bcea656f..af5d32ec46b 100644
--- a/src/Storages/System/StorageSystemMetrics.h
+++ b/src/Storages/System/StorageSystemMetrics.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemModels.cpp b/src/Storages/System/StorageSystemModels.cpp
index 9fae9803b96..3df48e830bb 100644
--- a/src/Storages/System/StorageSystemModels.cpp
+++ b/src/Storages/System/StorageSystemModels.cpp
@@ -25,9 +25,9 @@ NamesAndTypesList StorageSystemModels::getNamesAndTypes()
     };
 }
 
-void StorageSystemModels::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemModels::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto & external_models_loader = context.getExternalModelsLoader();
+    const auto & external_models_loader = context->getExternalModelsLoader();
     auto load_results = external_models_loader.getLoadResults();
 
     for (const auto & load_result : load_results)
diff --git a/src/Storages/System/StorageSystemModels.h b/src/Storages/System/StorageSystemModels.h
index cee5200e7de..832a9d550db 100644
--- a/src/Storages/System/StorageSystemModels.h
+++ b/src/Storages/System/StorageSystemModels.h
@@ -21,7 +21,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemMutations.cpp b/src/Storages/System/StorageSystemMutations.cpp
index f66f57ef5d1..fa521c632b8 100644
--- a/src/Storages/System/StorageSystemMutations.cpp
+++ b/src/Storages/System/StorageSystemMutations.cpp
@@ -35,9 +35,9 @@ NamesAndTypesList StorageSystemMutations::getNamesAndTypes()
 }
 
 
-void StorageSystemMutations::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const
+void StorageSystemMutations::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
 
     /// Collect a set of *MergeTree tables.
diff --git a/src/Storages/System/StorageSystemMutations.h b/src/Storages/System/StorageSystemMutations.h
index f7bc5f6f33c..1f41ff6051b 100644
--- a/src/Storages/System/StorageSystemMutations.h
+++ b/src/Storages/System/StorageSystemMutations.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemNumbers.cpp b/src/Storages/System/StorageSystemNumbers.cpp
index 677e0c02400..f8a0e94bf98 100644
--- a/src/Storages/System/StorageSystemNumbers.cpp
+++ b/src/Storages/System/StorageSystemNumbers.cpp
@@ -126,7 +126,7 @@ Pipe StorageSystemNumbers::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo &,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
diff --git a/src/Storages/System/StorageSystemNumbers.h b/src/Storages/System/StorageSystemNumbers.h
index d12c28c1ce2..708ace7a4cd 100644
--- a/src/Storages/System/StorageSystemNumbers.h
+++ b/src/Storages/System/StorageSystemNumbers.h
@@ -33,7 +33,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemOne.cpp b/src/Storages/System/StorageSystemOne.cpp
index c456b22e97b..7c28f897121 100644
--- a/src/Storages/System/StorageSystemOne.cpp
+++ b/src/Storages/System/StorageSystemOne.cpp
@@ -24,7 +24,7 @@ Pipe StorageSystemOne::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo &,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
diff --git a/src/Storages/System/StorageSystemOne.h b/src/Storages/System/StorageSystemOne.h
index 8228ce465e0..a34f9562025 100644
--- a/src/Storages/System/StorageSystemOne.h
+++ b/src/Storages/System/StorageSystemOne.h
@@ -25,7 +25,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemPartsBase.cpp b/src/Storages/System/StorageSystemPartsBase.cpp
index 02627a3ba03..f1c82aa4c63 100644
--- a/src/Storages/System/StorageSystemPartsBase.cpp
+++ b/src/Storages/System/StorageSystemPartsBase.cpp
@@ -62,8 +62,8 @@ StoragesInfo::getParts(MergeTreeData::DataPartStateVector & state, bool has_stat
     return data->getDataPartsVector({State::Committed}, &state);
 }
 
-StoragesInfoStream::StoragesInfoStream(const SelectQueryInfo & query_info, const Context & context)
-    : query_id(context.getCurrentQueryId()), settings(context.getSettings())
+StoragesInfoStream::StoragesInfoStream(const SelectQueryInfo & query_info, ContextPtr context)
+    : query_id(context->getCurrentQueryId()), settings(context->getSettings())
 {
     /// Will apply WHERE to subset of columns and then add more columns.
     /// This is kind of complicated, but we use WHERE to do less work.
@@ -74,7 +74,7 @@ StoragesInfoStream::StoragesInfoStream(const SelectQueryInfo & query_info, const
     MutableColumnPtr engine_column_mut = ColumnString::create();
     MutableColumnPtr active_column_mut = ColumnUInt8::create();
 
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_tables = !access->isGranted(AccessType::SHOW_TABLES);
 
     {
@@ -234,7 +234,7 @@ Pipe StorageSystemPartsBase::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
diff --git a/src/Storages/System/StorageSystemPartsBase.h b/src/Storages/System/StorageSystemPartsBase.h
index 3f63d75e2b6..33f82d04252 100644
--- a/src/Storages/System/StorageSystemPartsBase.h
+++ b/src/Storages/System/StorageSystemPartsBase.h
@@ -31,7 +31,7 @@ struct StoragesInfo
 class StoragesInfoStream
 {
 public:
-    StoragesInfoStream(const SelectQueryInfo & query_info, const Context & context);
+    StoragesInfoStream(const SelectQueryInfo & query_info, ContextPtr context);
     StoragesInfo next();
 
 private:
@@ -59,7 +59,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & metadata_snapshot,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemPrivileges.cpp b/src/Storages/System/StorageSystemPrivileges.cpp
index 5dda0caf201..ca369efe43a 100644
--- a/src/Storages/System/StorageSystemPrivileges.cpp
+++ b/src/Storages/System/StorageSystemPrivileges.cpp
@@ -74,7 +74,7 @@ NamesAndTypesList StorageSystemPrivileges::getNamesAndTypes()
 }
 
 
-void StorageSystemPrivileges::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemPrivileges::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     size_t column_index = 0;
     auto & column_access_type = assert_cast<ColumnInt8 &>(*res_columns[column_index++]).getData();
diff --git a/src/Storages/System/StorageSystemPrivileges.h b/src/Storages/System/StorageSystemPrivileges.h
index 8540e3d7ec3..618e1c91597 100644
--- a/src/Storages/System/StorageSystemPrivileges.h
+++ b/src/Storages/System/StorageSystemPrivileges.h
@@ -19,7 +19,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemPrivileges>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemProcesses.cpp b/src/Storages/System/StorageSystemProcesses.cpp
index e6266503095..785b4c0df11 100644
--- a/src/Storages/System/StorageSystemProcesses.cpp
+++ b/src/Storages/System/StorageSystemProcesses.cpp
@@ -70,9 +70,9 @@ NamesAndTypesList StorageSystemProcesses::getNamesAndTypes()
 }
 
 
-void StorageSystemProcesses::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemProcesses::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    ProcessList::Info info = context.getProcessList().getInfo(true, true, true);
+    ProcessList::Info info = context->getProcessList().getInfo(true, true, true);
 
     for (const auto & process : info)
     {
diff --git a/src/Storages/System/StorageSystemProcesses.h b/src/Storages/System/StorageSystemProcesses.h
index 62c568970e7..4f876348a4b 100644
--- a/src/Storages/System/StorageSystemProcesses.h
+++ b/src/Storages/System/StorageSystemProcesses.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemQuotaLimits.cpp b/src/Storages/System/StorageSystemQuotaLimits.cpp
index c6e99cc9203..63a419e213c 100644
--- a/src/Storages/System/StorageSystemQuotaLimits.cpp
+++ b/src/Storages/System/StorageSystemQuotaLimits.cpp
@@ -69,10 +69,10 @@ NamesAndTypesList StorageSystemQuotaLimits::getNamesAndTypes()
 }
 
 
-void StorageSystemQuotaLimits::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemQuotaLimits::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_QUOTAS);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_QUOTAS);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<Quota>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemQuotaLimits.h b/src/Storages/System/StorageSystemQuotaLimits.h
index e9ae7fc09d0..8f496734e0f 100644
--- a/src/Storages/System/StorageSystemQuotaLimits.h
+++ b/src/Storages/System/StorageSystemQuotaLimits.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemQuotaLimits>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemQuotaUsage.cpp b/src/Storages/System/StorageSystemQuotaUsage.cpp
index 6d6e22e7be6..a25a130bf6c 100644
--- a/src/Storages/System/StorageSystemQuotaUsage.cpp
+++ b/src/Storages/System/StorageSystemQuotaUsage.cpp
@@ -81,10 +81,10 @@ NamesAndTypesList StorageSystemQuotaUsage::getNamesAndTypesImpl(bool add_column_
 }
 
 
-void StorageSystemQuotaUsage::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemQuotaUsage::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_QUOTAS);
-    auto usage = context.getQuotaUsage();
+    context->checkAccess(AccessType::SHOW_QUOTAS);
+    auto usage = context->getQuotaUsage();
     if (!usage)
         return;
 
@@ -94,7 +94,7 @@ void StorageSystemQuotaUsage::fillData(MutableColumns & res_columns, const Conte
 
 void StorageSystemQuotaUsage::fillDataImpl(
     MutableColumns & res_columns,
-    const Context & context,
+    ContextPtr context,
     bool add_column_is_current,
     const std::vector<QuotaUsage> & quotas_usage)
 {
@@ -128,7 +128,7 @@ void StorageSystemQuotaUsage::fillDataImpl(
     std::optional<UUID> current_quota_id;
     if (add_column_is_current)
     {
-        if (auto current_usage = context.getQuotaUsage())
+        if (auto current_usage = context->getQuotaUsage())
             current_quota_id = current_usage->quota_id;
     }
 
diff --git a/src/Storages/System/StorageSystemQuotaUsage.h b/src/Storages/System/StorageSystemQuotaUsage.h
index abb9505eb5a..806c3eb3f4a 100644
--- a/src/Storages/System/StorageSystemQuotaUsage.h
+++ b/src/Storages/System/StorageSystemQuotaUsage.h
@@ -20,12 +20,12 @@ public:
     static NamesAndTypesList getNamesAndTypes();
 
     static NamesAndTypesList getNamesAndTypesImpl(bool add_column_is_current);
-    static void fillDataImpl(MutableColumns & res_columns, const Context & context, bool add_column_is_current, const std::vector<QuotaUsage> & quotas_usage);
+    static void fillDataImpl(MutableColumns & res_columns, ContextPtr context, bool add_column_is_current, const std::vector<QuotaUsage> & quotas_usage);
 
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemQuotaUsage>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemQuotas.cpp b/src/Storages/System/StorageSystemQuotas.cpp
index fab6384e6a8..4bba082f66e 100644
--- a/src/Storages/System/StorageSystemQuotas.cpp
+++ b/src/Storages/System/StorageSystemQuotas.cpp
@@ -52,10 +52,10 @@ NamesAndTypesList StorageSystemQuotas::getNamesAndTypes()
 }
 
 
-void StorageSystemQuotas::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemQuotas::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_QUOTAS);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_QUOTAS);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<Quota>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemQuotas.h b/src/Storages/System/StorageSystemQuotas.h
index 8d1da53d641..fb74ea9b05f 100644
--- a/src/Storages/System/StorageSystemQuotas.h
+++ b/src/Storages/System/StorageSystemQuotas.h
@@ -19,7 +19,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemQuotas>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemQuotasUsage.cpp b/src/Storages/System/StorageSystemQuotasUsage.cpp
index 5c6879cd143..363562bce19 100644
--- a/src/Storages/System/StorageSystemQuotasUsage.cpp
+++ b/src/Storages/System/StorageSystemQuotasUsage.cpp
@@ -13,10 +13,10 @@ NamesAndTypesList StorageSystemQuotasUsage::getNamesAndTypes()
     return StorageSystemQuotaUsage::getNamesAndTypesImpl(/* add_column_is_current = */ true);
 }
 
-void StorageSystemQuotasUsage::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemQuotasUsage::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_QUOTAS);
-    auto all_quotas_usage = context.getAccessControlManager().getAllQuotasUsage();
+    context->checkAccess(AccessType::SHOW_QUOTAS);
+    auto all_quotas_usage = context->getAccessControlManager().getAllQuotasUsage();
     StorageSystemQuotaUsage::fillDataImpl(res_columns, context, /* add_column_is_current = */ true, all_quotas_usage);
 }
 }
diff --git a/src/Storages/System/StorageSystemQuotasUsage.h b/src/Storages/System/StorageSystemQuotasUsage.h
index d4fd93b577d..1f29ea9b886 100644
--- a/src/Storages/System/StorageSystemQuotasUsage.h
+++ b/src/Storages/System/StorageSystemQuotasUsage.h
@@ -20,7 +20,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemQuotasUsage>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemReplicas.cpp b/src/Storages/System/StorageSystemReplicas.cpp
index 0af67ab6986..fc33c6b421b 100644
--- a/src/Storages/System/StorageSystemReplicas.cpp
+++ b/src/Storages/System/StorageSystemReplicas.cpp
@@ -60,14 +60,14 @@ Pipe StorageSystemReplicas::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
 {
     metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
 
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
 
     /// We collect a set of replicated tables.
diff --git a/src/Storages/System/StorageSystemReplicas.h b/src/Storages/System/StorageSystemReplicas.h
index d9e364a28c0..2352d7ccdf2 100644
--- a/src/Storages/System/StorageSystemReplicas.h
+++ b/src/Storages/System/StorageSystemReplicas.h
@@ -22,7 +22,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemReplicatedFetches.cpp b/src/Storages/System/StorageSystemReplicatedFetches.cpp
index 53bec5aa42f..453568e3b86 100644
--- a/src/Storages/System/StorageSystemReplicatedFetches.cpp
+++ b/src/Storages/System/StorageSystemReplicatedFetches.cpp
@@ -30,12 +30,12 @@ NamesAndTypesList StorageSystemReplicatedFetches::getNamesAndTypes()
     };
 }
 
-void StorageSystemReplicatedFetches::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemReplicatedFetches::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_tables = !access->isGranted(AccessType::SHOW_TABLES);
 
-    for (const auto & fetch : context.getReplicatedFetchList().get())
+    for (const auto & fetch : context->getReplicatedFetchList().get())
     {
         if (check_access_for_tables && !access->isGranted(AccessType::SHOW_TABLES, fetch.database, fetch.table))
             continue;
diff --git a/src/Storages/System/StorageSystemReplicatedFetches.h b/src/Storages/System/StorageSystemReplicatedFetches.h
index 34081923e4f..ed25e75eb70 100644
--- a/src/Storages/System/StorageSystemReplicatedFetches.h
+++ b/src/Storages/System/StorageSystemReplicatedFetches.h
@@ -22,7 +22,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemReplicationQueue.cpp b/src/Storages/System/StorageSystemReplicationQueue.cpp
index 9cd5e8b8ff3..8acd192eac4 100644
--- a/src/Storages/System/StorageSystemReplicationQueue.cpp
+++ b/src/Storages/System/StorageSystemReplicationQueue.cpp
@@ -47,9 +47,9 @@ NamesAndTypesList StorageSystemReplicationQueue::getNamesAndTypes()
 }
 
 
-void StorageSystemReplicationQueue::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const
+void StorageSystemReplicationQueue::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const
 {
-    const auto access = context.getAccess();
+    const auto access = context->getAccess();
     const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
 
     std::map<String, std::map<String, StoragePtr>> replicated_tables;
diff --git a/src/Storages/System/StorageSystemReplicationQueue.h b/src/Storages/System/StorageSystemReplicationQueue.h
index 36841fb9be9..f85f23a2b20 100644
--- a/src/Storages/System/StorageSystemReplicationQueue.h
+++ b/src/Storages/System/StorageSystemReplicationQueue.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemRoleGrants.cpp b/src/Storages/System/StorageSystemRoleGrants.cpp
index cf0fad8f8ce..32984afcfc5 100644
--- a/src/Storages/System/StorageSystemRoleGrants.cpp
+++ b/src/Storages/System/StorageSystemRoleGrants.cpp
@@ -31,10 +31,10 @@ NamesAndTypesList StorageSystemRoleGrants::getNamesAndTypes()
 }
 
 
-void StorageSystemRoleGrants::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemRoleGrants::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_USERS | AccessType::SHOW_ROLES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_USERS | AccessType::SHOW_ROLES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<User>();
     boost::range::push_back(ids, access_control.findAll<Role>());
 
diff --git a/src/Storages/System/StorageSystemRoleGrants.h b/src/Storages/System/StorageSystemRoleGrants.h
index 0a02303abc3..a290dcf320d 100644
--- a/src/Storages/System/StorageSystemRoleGrants.h
+++ b/src/Storages/System/StorageSystemRoleGrants.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemRoleGrants>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemRoles.cpp b/src/Storages/System/StorageSystemRoles.cpp
index c560bc2bc6e..65ae74887a7 100644
--- a/src/Storages/System/StorageSystemRoles.cpp
+++ b/src/Storages/System/StorageSystemRoles.cpp
@@ -23,10 +23,10 @@ NamesAndTypesList StorageSystemRoles::getNamesAndTypes()
 }
 
 
-void StorageSystemRoles::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemRoles::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_ROLES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_ROLES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<Role>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemRoles.h b/src/Storages/System/StorageSystemRoles.h
index fb44194baff..38c7ed05f1e 100644
--- a/src/Storages/System/StorageSystemRoles.h
+++ b/src/Storages/System/StorageSystemRoles.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemRoles>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemRowPolicies.cpp b/src/Storages/System/StorageSystemRowPolicies.cpp
index 9b11a781d6f..f9d6b14957e 100644
--- a/src/Storages/System/StorageSystemRowPolicies.cpp
+++ b/src/Storages/System/StorageSystemRowPolicies.cpp
@@ -52,10 +52,10 @@ NamesAndTypesList StorageSystemRowPolicies::getNamesAndTypes()
 }
 
 
-void StorageSystemRowPolicies::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemRowPolicies::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_ROW_POLICIES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_ROW_POLICIES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<RowPolicy>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemRowPolicies.h b/src/Storages/System/StorageSystemRowPolicies.h
index b81020b421c..3b9ebfcc25a 100644
--- a/src/Storages/System/StorageSystemRowPolicies.h
+++ b/src/Storages/System/StorageSystemRowPolicies.h
@@ -20,7 +20,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemRowPolicies>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemSettings.cpp b/src/Storages/System/StorageSystemSettings.cpp
index 07a2d450b12..1aca7e45190 100644
--- a/src/Storages/System/StorageSystemSettings.cpp
+++ b/src/Storages/System/StorageSystemSettings.cpp
@@ -26,10 +26,10 @@ NamesAndTypesList StorageSystemSettings::getNamesAndTypes()
 #pragma GCC optimize("-fno-var-tracking-assignments")
 #endif
 
-void StorageSystemSettings::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemSettings::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const Settings & settings = context.getSettingsRef();
-    auto settings_constraints = context.getSettingsConstraints();
+    const Settings & settings = context->getSettingsRef();
+    auto settings_constraints = context->getSettingsConstraints();
     for (const auto & setting : settings.all())
     {
         const auto & setting_name = setting.getName();
diff --git a/src/Storages/System/StorageSystemSettings.h b/src/Storages/System/StorageSystemSettings.h
index 6cb5e18e1d7..d93c09d3f80 100644
--- a/src/Storages/System/StorageSystemSettings.h
+++ b/src/Storages/System/StorageSystemSettings.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemSettingsProfileElements.cpp b/src/Storages/System/StorageSystemSettingsProfileElements.cpp
index cf47416e188..fa824091238 100644
--- a/src/Storages/System/StorageSystemSettingsProfileElements.cpp
+++ b/src/Storages/System/StorageSystemSettingsProfileElements.cpp
@@ -37,10 +37,10 @@ NamesAndTypesList StorageSystemSettingsProfileElements::getNamesAndTypes()
 }
 
 
-void StorageSystemSettingsProfileElements::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemSettingsProfileElements::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_SETTINGS_PROFILES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_SETTINGS_PROFILES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<User>();
     boost::range::push_back(ids, access_control.findAll<Role>());
     boost::range::push_back(ids, access_control.findAll<SettingsProfile>());
diff --git a/src/Storages/System/StorageSystemSettingsProfileElements.h b/src/Storages/System/StorageSystemSettingsProfileElements.h
index 2dc79fed0e7..2262ea96dde 100644
--- a/src/Storages/System/StorageSystemSettingsProfileElements.h
+++ b/src/Storages/System/StorageSystemSettingsProfileElements.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemSettingsProfileElements>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemSettingsProfiles.cpp b/src/Storages/System/StorageSystemSettingsProfiles.cpp
index a678290d447..c726f54a324 100644
--- a/src/Storages/System/StorageSystemSettingsProfiles.cpp
+++ b/src/Storages/System/StorageSystemSettingsProfiles.cpp
@@ -30,10 +30,10 @@ NamesAndTypesList StorageSystemSettingsProfiles::getNamesAndTypes()
 }
 
 
-void StorageSystemSettingsProfiles::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemSettingsProfiles::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_SETTINGS_PROFILES);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_SETTINGS_PROFILES);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<SettingsProfile>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemSettingsProfiles.h b/src/Storages/System/StorageSystemSettingsProfiles.h
index c6b887c99df..580430dc28b 100644
--- a/src/Storages/System/StorageSystemSettingsProfiles.h
+++ b/src/Storages/System/StorageSystemSettingsProfiles.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemSettingsProfiles>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemStackTrace.cpp b/src/Storages/System/StorageSystemStackTrace.cpp
index e74d56108ad..a6651aff8be 100644
--- a/src/Storages/System/StorageSystemStackTrace.cpp
+++ b/src/Storages/System/StorageSystemStackTrace.cpp
@@ -183,7 +183,7 @@ NamesAndTypesList StorageSystemStackTrace::getNamesAndTypes()
 }
 
 
-void StorageSystemStackTrace::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemStackTrace::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     /// It shouldn't be possible to do concurrent reads from this table.
     std::lock_guard lock(mutex);
diff --git a/src/Storages/System/StorageSystemStackTrace.h b/src/Storages/System/StorageSystemStackTrace.h
index 582618d2ecd..7f10e309775 100644
--- a/src/Storages/System/StorageSystemStackTrace.h
+++ b/src/Storages/System/StorageSystemStackTrace.h
@@ -31,7 +31,7 @@ public:
 
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     mutable std::mutex mutex;
 
diff --git a/src/Storages/System/StorageSystemStoragePolicies.cpp b/src/Storages/System/StorageSystemStoragePolicies.cpp
index 7a10b986c11..48dfadd2b3c 100644
--- a/src/Storages/System/StorageSystemStoragePolicies.cpp
+++ b/src/Storages/System/StorageSystemStoragePolicies.cpp
@@ -39,7 +39,7 @@ Pipe StorageSystemStoragePolicies::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & /*query_info*/,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t /*max_block_size*/,
     const unsigned /*num_streams*/)
@@ -55,7 +55,7 @@ Pipe StorageSystemStoragePolicies::read(
     MutableColumnPtr col_move_factor = ColumnFloat32::create();
     MutableColumnPtr col_prefer_not_to_merge = ColumnUInt8::create();
 
-    for (const auto & [policy_name, policy_ptr] : context.getPoliciesMap())
+    for (const auto & [policy_name, policy_ptr] : context->getPoliciesMap())
     {
         const auto & volumes = policy_ptr->getVolumes();
         for (size_t i = 0; i != volumes.size(); ++i)
diff --git a/src/Storages/System/StorageSystemStoragePolicies.h b/src/Storages/System/StorageSystemStoragePolicies.h
index afd5e672d66..70053ebc1bc 100644
--- a/src/Storages/System/StorageSystemStoragePolicies.h
+++ b/src/Storages/System/StorageSystemStoragePolicies.h
@@ -24,7 +24,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemTableEngines.cpp b/src/Storages/System/StorageSystemTableEngines.cpp
index 3f06faf6736..bc33cd9189c 100644
--- a/src/Storages/System/StorageSystemTableEngines.cpp
+++ b/src/Storages/System/StorageSystemTableEngines.cpp
@@ -20,7 +20,7 @@ NamesAndTypesList StorageSystemTableEngines::getNamesAndTypes()
     };
 }
 
-void StorageSystemTableEngines::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemTableEngines::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (const auto & pair : StorageFactory::instance().getAllStorages())
     {
diff --git a/src/Storages/System/StorageSystemTableEngines.h b/src/Storages/System/StorageSystemTableEngines.h
index 1c080c3040b..37f7f354073 100644
--- a/src/Storages/System/StorageSystemTableEngines.h
+++ b/src/Storages/System/StorageSystemTableEngines.h
@@ -12,7 +12,7 @@ class StorageSystemTableEngines final : public ext::shared_ptr_helper<StorageSys
 {
     friend struct ext::shared_ptr_helper<StorageSystemTableEngines>;
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemTableFunctions.cpp b/src/Storages/System/StorageSystemTableFunctions.cpp
index 65b1dc41879..2824e1726e9 100644
--- a/src/Storages/System/StorageSystemTableFunctions.cpp
+++ b/src/Storages/System/StorageSystemTableFunctions.cpp
@@ -9,7 +9,7 @@ NamesAndTypesList StorageSystemTableFunctions::getNamesAndTypes()
     return {{"name", std::make_shared<DataTypeString>()}};
 }
 
-void StorageSystemTableFunctions::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemTableFunctions::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     const auto & functions_names = TableFunctionFactory::instance().getAllRegisteredNames();
     for (const auto & function_name : functions_names)
diff --git a/src/Storages/System/StorageSystemTableFunctions.h b/src/Storages/System/StorageSystemTableFunctions.h
index 95e025b9881..a5db5450d20 100644
--- a/src/Storages/System/StorageSystemTableFunctions.h
+++ b/src/Storages/System/StorageSystemTableFunctions.h
@@ -14,7 +14,7 @@ protected:
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
 public:
 
diff --git a/src/Storages/System/StorageSystemTables.cpp b/src/Storages/System/StorageSystemTables.cpp
index 4599dad2e3d..9602339f381 100644
--- a/src/Storages/System/StorageSystemTables.cpp
+++ b/src/Storages/System/StorageSystemTables.cpp
@@ -62,7 +62,7 @@ StorageSystemTables::StorageSystemTables(const StorageID & table_id_)
 }
 
 
-static ColumnPtr getFilteredDatabases(const SelectQueryInfo & query_info, const Context & context)
+static ColumnPtr getFilteredDatabases(const SelectQueryInfo & query_info, ContextPtr context)
 {
     MutableColumnPtr column = ColumnString::create();
 
@@ -104,12 +104,12 @@ public:
         Block header,
         UInt64 max_block_size_,
         ColumnPtr databases_,
-        const Context & context_)
+        ContextPtr context_)
         : SourceWithProgress(std::move(header))
         , columns_mask(std::move(columns_mask_))
         , max_block_size(max_block_size_)
         , databases(std::move(databases_))
-        , context(context_) {}
+        , context(Context::createCopy(context_)) {}
 
     String getName() const override { return "Tables"; }
 
@@ -121,7 +121,7 @@ protected:
 
         MutableColumns res_columns = getPort().getHeader().cloneEmptyColumns();
 
-        const auto access = context.getAccess();
+        const auto access = context->getAccess();
         const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
 
         size_t rows_count = 0;
@@ -148,9 +148,9 @@ protected:
             /// This is for temporary tables. They are output in single block regardless to max_block_size.
             if (database_idx >= databases->size())
             {
-                if (context.hasSessionContext())
+                if (context->hasSessionContext())
                 {
-                    Tables external_tables = context.getSessionContext().getExternalTables();
+                    Tables external_tables = context->getSessionContext()->getExternalTables();
 
                     for (auto & table : external_tables)
                     {
@@ -278,7 +278,7 @@ protected:
                     }
                     try
                     {
-                        lock = table->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
+                        lock = table->lockForShare(context->getCurrentQueryId(), context->getSettingsRef().lock_acquire_timeout);
                     }
                     catch (const Exception & e)
                     {
@@ -355,7 +355,7 @@ protected:
                 {
                     ASTPtr ast = database->tryGetCreateTableQuery(table_name, context);
 
-                    if (ast && !context.getSettingsRef().show_table_uuid_in_table_create_query_if_not_nil)
+                    if (ast && !context->getSettingsRef().show_table_uuid_in_table_create_query_if_not_nil)
                     {
                         auto & create = ast->as<ASTCreateQuery &>();
                         create.uuid = UUIDHelpers::Nil;
@@ -442,7 +442,7 @@ protected:
                 if (columns_mask[src_index++])
                 {
                     assert(table != nullptr);
-                    auto total_rows = table->totalRows(context.getSettingsRef());
+                    auto total_rows = table->totalRows(context->getSettingsRef());
                     if (total_rows)
                         res_columns[res_index++]->insert(*total_rows);
                     else
@@ -452,7 +452,7 @@ protected:
                 if (columns_mask[src_index++])
                 {
                     assert(table != nullptr);
-                    auto total_bytes = table->totalBytes(context.getSettingsRef());
+                    auto total_bytes = table->totalBytes(context->getSettingsRef());
                     if (total_bytes)
                         res_columns[res_index++]->insert(*total_bytes);
                     else
@@ -490,7 +490,7 @@ private:
     ColumnPtr databases;
     size_t database_idx = 0;
     DatabaseTablesIteratorPtr tables_it;
-    const Context context;
+    ContextPtr context;
     bool done = false;
     DatabasePtr database;
     std::string database_name;
@@ -501,7 +501,7 @@ Pipe StorageSystemTables::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo & query_info,
-    const Context & context,
+    ContextPtr context,
     QueryProcessingStage::Enum /*processed_stage*/,
     const size_t max_block_size,
     const unsigned /*num_streams*/)
diff --git a/src/Storages/System/StorageSystemTables.h b/src/Storages/System/StorageSystemTables.h
index 2e0b3386f8c..da5e236b33f 100644
--- a/src/Storages/System/StorageSystemTables.h
+++ b/src/Storages/System/StorageSystemTables.h
@@ -22,7 +22,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemTimeZones.cpp b/src/Storages/System/StorageSystemTimeZones.cpp
index e5523f54caf..dc3711812a6 100644
--- a/src/Storages/System/StorageSystemTimeZones.cpp
+++ b/src/Storages/System/StorageSystemTimeZones.cpp
@@ -15,7 +15,7 @@ NamesAndTypesList StorageSystemTimeZones::getNamesAndTypes()
     };
 }
 
-void StorageSystemTimeZones::fillData(MutableColumns & res_columns, const Context &, const SelectQueryInfo &) const
+void StorageSystemTimeZones::fillData(MutableColumns & res_columns, ContextPtr, const SelectQueryInfo &) const
 {
     for (auto * it = auto_time_zones; *it; ++it)
         res_columns[0]->insert(String(*it));
diff --git a/src/Storages/System/StorageSystemTimeZones.h b/src/Storages/System/StorageSystemTimeZones.h
index b7544ecb16d..0f68b2de293 100644
--- a/src/Storages/System/StorageSystemTimeZones.h
+++ b/src/Storages/System/StorageSystemTimeZones.h
@@ -17,7 +17,7 @@ class StorageSystemTimeZones final : public ext::shared_ptr_helper<StorageSystem
     friend struct ext::shared_ptr_helper<StorageSystemTimeZones>;
 
 protected:
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
diff --git a/src/Storages/System/StorageSystemUserDirectories.cpp b/src/Storages/System/StorageSystemUserDirectories.cpp
index 519f0c0dcb0..7858af25365 100644
--- a/src/Storages/System/StorageSystemUserDirectories.cpp
+++ b/src/Storages/System/StorageSystemUserDirectories.cpp
@@ -22,9 +22,9 @@ NamesAndTypesList StorageSystemUserDirectories::getNamesAndTypes()
 }
 
 
-void StorageSystemUserDirectories::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemUserDirectories::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    const auto & access_control = context.getAccessControlManager();
+    const auto & access_control = context->getAccessControlManager();
     auto storages = access_control.getStorages();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemUserDirectories.h b/src/Storages/System/StorageSystemUserDirectories.h
index 902c890fe29..0ddb0ad49d8 100644
--- a/src/Storages/System/StorageSystemUserDirectories.h
+++ b/src/Storages/System/StorageSystemUserDirectories.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemUserDirectories>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemUsers.cpp b/src/Storages/System/StorageSystemUsers.cpp
index eaebf759a85..e60f1372df9 100644
--- a/src/Storages/System/StorageSystemUsers.cpp
+++ b/src/Storages/System/StorageSystemUsers.cpp
@@ -55,10 +55,10 @@ NamesAndTypesList StorageSystemUsers::getNamesAndTypes()
 }
 
 
-void StorageSystemUsers::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
+void StorageSystemUsers::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const
 {
-    context.checkAccess(AccessType::SHOW_USERS);
-    const auto & access_control = context.getAccessControlManager();
+    context->checkAccess(AccessType::SHOW_USERS);
+    const auto & access_control = context->getAccessControlManager();
     std::vector<UUID> ids = access_control.findAll<User>();
 
     size_t column_index = 0;
diff --git a/src/Storages/System/StorageSystemUsers.h b/src/Storages/System/StorageSystemUsers.h
index 707ea94591d..3c463a23db9 100644
--- a/src/Storages/System/StorageSystemUsers.h
+++ b/src/Storages/System/StorageSystemUsers.h
@@ -18,7 +18,7 @@ public:
 protected:
     friend struct ext::shared_ptr_helper<StorageSystemUsers>;
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo &) const override;
 };
 
 }
diff --git a/src/Storages/System/StorageSystemZeros.cpp b/src/Storages/System/StorageSystemZeros.cpp
index ed5ab93369a..d1456d72685 100644
--- a/src/Storages/System/StorageSystemZeros.cpp
+++ b/src/Storages/System/StorageSystemZeros.cpp
@@ -94,7 +94,7 @@ Pipe StorageSystemZeros::read(
     const Names & column_names,
     const StorageMetadataPtr & metadata_snapshot,
     SelectQueryInfo &,
-    const Context & /*context*/,
+    ContextPtr /*context*/,
     QueryProcessingStage::Enum /*processed_stage*/,
     size_t max_block_size,
     unsigned num_streams)
diff --git a/src/Storages/System/StorageSystemZeros.h b/src/Storages/System/StorageSystemZeros.h
index 04733f550c1..2ccdcf9c944 100644
--- a/src/Storages/System/StorageSystemZeros.h
+++ b/src/Storages/System/StorageSystemZeros.h
@@ -24,7 +24,7 @@ public:
         const Names & column_names,
         const StorageMetadataPtr & /*metadata_snapshot*/,
         SelectQueryInfo & query_info,
-        const Context & context,
+        ContextPtr context,
         QueryProcessingStage::Enum processed_stage,
         size_t max_block_size,
         unsigned num_streams) override;
diff --git a/src/Storages/System/StorageSystemZooKeeper.cpp b/src/Storages/System/StorageSystemZooKeeper.cpp
index 8fa5ccbd630..1a8aac3b277 100644
--- a/src/Storages/System/StorageSystemZooKeeper.cpp
+++ b/src/Storages/System/StorageSystemZooKeeper.cpp
@@ -63,7 +63,7 @@ static String pathCorrected(const String & path)
 }
 
 
-static bool extractPathImpl(const IAST & elem, Paths & res, const Context & context)
+static bool extractPathImpl(const IAST & elem, Paths & res, ContextPtr context)
 {
     const auto * function = elem.as<ASTFunction>();
     if (!function)
@@ -94,8 +94,8 @@ static bool extractPathImpl(const IAST & elem, Paths & res, const Context & cont
         {
             auto interpreter_subquery = interpretSubquery(value, context, {}, {});
             auto stream = interpreter_subquery->execute().getInputStream();
-            SizeLimits limites(context.getSettingsRef().max_rows_in_set, context.getSettingsRef().max_bytes_in_set, OverflowMode::THROW);
-            Set set(limites, true, context.getSettingsRef().transform_null_in);
+            SizeLimits limites(context->getSettingsRef().max_rows_in_set, context->getSettingsRef().max_bytes_in_set, OverflowMode::THROW);
+            Set set(limites, true, context->getSettingsRef().transform_null_in);
             set.setHeader(stream->getHeader());
 
             stream->readPrefix();
@@ -165,7 +165,7 @@ static bool extractPathImpl(const IAST & elem, Paths & res, const Context & cont
 
 /** Retrieve from the query a condition of the form `path = 'path'`, from conjunctions in the WHERE clause.
   */
-static Paths extractPath(const ASTPtr & query, const Context & context)
+static Paths extractPath(const ASTPtr & query, ContextPtr context)
 {
     const auto & select = query->as<ASTSelectQuery &>();
     if (!select.where())
@@ -176,13 +176,13 @@ static Paths extractPath(const ASTPtr & query, const Context & context)
 }
 
 
-void StorageSystemZooKeeper::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const
+void StorageSystemZooKeeper::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const
 {
     const Paths & paths = extractPath(query_info.query, context);
     if (paths.empty())
         throw Exception("SELECT from system.zookeeper table must contain condition like path = 'path' or path IN ('path1','path2'...) or path IN (subquery) in WHERE clause.", ErrorCodes::BAD_ARGUMENTS);
 
-    zkutil::ZooKeeperPtr zookeeper = context.getZooKeeper();
+    zkutil::ZooKeeperPtr zookeeper = context->getZooKeeper();
 
     std::unordered_set<String> paths_corrected;
     for (const auto & path : paths)
diff --git a/src/Storages/System/StorageSystemZooKeeper.h b/src/Storages/System/StorageSystemZooKeeper.h
index 06611f61dae..226ca79facf 100644
--- a/src/Storages/System/StorageSystemZooKeeper.h
+++ b/src/Storages/System/StorageSystemZooKeeper.h
@@ -23,7 +23,7 @@ public:
 protected:
     using IStorageSystemOneBlock::IStorageSystemOneBlock;
 
-    void fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo & query_info) const override;
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
 };
 
 }
diff --git a/src/Storages/TTLDescription.cpp b/src/Storages/TTLDescription.cpp
index 41c20b2714b..95ea4f07f18 100644
--- a/src/Storages/TTLDescription.cpp
+++ b/src/Storages/TTLDescription.cpp
@@ -162,7 +162,7 @@ TTLDescription & TTLDescription::operator=(const TTLDescription & other)
 TTLDescription TTLDescription::getTTLFromAST(
     const ASTPtr & definition_ast,
     const ColumnsDescription & columns,
-    const Context & context,
+    ContextPtr context,
     const KeyDescription & primary_key)
 {
     TTLDescription result;
@@ -289,7 +289,7 @@ TTLDescription TTLDescription::getTTLFromAST(
         {
             result.recompression_codec =
                 CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(
-                    ttl_element->recompression_codec, {}, !context.getSettingsRef().allow_suspicious_codecs);
+                    ttl_element->recompression_codec, {}, !context->getSettingsRef().allow_suspicious_codecs);
         }
     }
 
@@ -330,7 +330,7 @@ TTLTableDescription & TTLTableDescription::operator=(const TTLTableDescription &
 TTLTableDescription TTLTableDescription::getTTLForTableFromAST(
     const ASTPtr & definition_ast,
     const ColumnsDescription & columns,
-    const Context & context,
+    ContextPtr context,
     const KeyDescription & primary_key)
 {
     TTLTableDescription result;
diff --git a/src/Storages/TTLDescription.h b/src/Storages/TTLDescription.h
index a2340ad6bcd..6288098b3c5 100644
--- a/src/Storages/TTLDescription.h
+++ b/src/Storages/TTLDescription.h
@@ -80,7 +80,7 @@ struct TTLDescription
 
     /// Parse TTL structure from definition. Able to parse both column and table
     /// TTLs.
-    static TTLDescription getTTLFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, const Context & context, const KeyDescription & primary_key);
+    static TTLDescription getTTLFromAST(const ASTPtr & definition_ast, const ColumnsDescription & columns, ContextPtr context, const KeyDescription & primary_key);
 
     TTLDescription() = default;
     TTLDescription(const TTLDescription & other);
@@ -117,7 +117,7 @@ struct TTLTableDescription
     TTLTableDescription & operator=(const TTLTableDescription & other);
 
     static TTLTableDescription getTTLForTableFromAST(
-        const ASTPtr & definition_ast, const ColumnsDescription & columns, const Context & context, const KeyDescription & primary_key);
+        const ASTPtr & definition_ast, const ColumnsDescription & columns, ContextPtr context, const KeyDescription & primary_key);
 };
 
 }
diff --git a/src/Storages/VirtualColumnUtils.cpp b/src/Storages/VirtualColumnUtils.cpp
index 0002d7c9c28..c479c6d45b3 100644
--- a/src/Storages/VirtualColumnUtils.cpp
+++ b/src/Storages/VirtualColumnUtils.cpp
@@ -122,7 +122,7 @@ void rewriteEntityInAst(ASTPtr ast, const String & column_name, const Field & va
     }
 }
 
-bool prepareFilterBlockWithQuery(const ASTPtr & query, const Context & context, Block block, ASTPtr & expression_ast)
+bool prepareFilterBlockWithQuery(const ASTPtr & query, ContextPtr context, Block block, ASTPtr & expression_ast)
 {
     bool unmodified = true;
     const auto & select = query->as<ASTSelectQuery &>();
@@ -167,7 +167,7 @@ bool prepareFilterBlockWithQuery(const ASTPtr & query, const Context & context,
     return unmodified;
 }
 
-void filterBlockWithQuery(const ASTPtr & query, Block & block, const Context & context, ASTPtr expression_ast)
+void filterBlockWithQuery(const ASTPtr & query, Block & block, ContextPtr context, ASTPtr expression_ast)
 {
     if (!expression_ast)
         prepareFilterBlockWithQuery(query, context, block, expression_ast);
diff --git a/src/Storages/VirtualColumnUtils.h b/src/Storages/VirtualColumnUtils.h
index 78e3d62472e..15783f6e79f 100644
--- a/src/Storages/VirtualColumnUtils.h
+++ b/src/Storages/VirtualColumnUtils.h
@@ -1,16 +1,16 @@
 #pragma once
 
-#include <unordered_set>
-
 #include <Core/Block.h>
+#include <Interpreters/Context_fwd.h>
 #include <Parsers/IAST_fwd.h>
 #include <Storages/SelectQueryInfo.h>
 
+#include <unordered_set>
+
 
 namespace DB
 {
 
-class Context;
 class NamesAndTypesList;
 
 
@@ -27,12 +27,12 @@ void rewriteEntityInAst(ASTPtr ast, const String & column_name, const Field & va
 
 /// Prepare `expression_ast` to filter block. Returns true if `expression_ast` is not trimmed, that is,
 /// `block` provides all needed columns for `expression_ast`, else return false.
-bool prepareFilterBlockWithQuery(const ASTPtr & query, const Context & context, Block block, ASTPtr & expression_ast);
+bool prepareFilterBlockWithQuery(const ASTPtr & query, ContextPtr context, Block block, ASTPtr & expression_ast);
 
 /// Leave in the block only the rows that fit under the WHERE clause and the PREWHERE clause of the query.
 /// Only elements of the outer conjunction are considered, depending only on the columns present in the block.
 /// If `expression_ast` is passed, use it to filter block.
-void filterBlockWithQuery(const ASTPtr & query, Block & block, const Context & context, ASTPtr expression_ast = {});
+void filterBlockWithQuery(const ASTPtr & query, Block & block, ContextPtr context, ASTPtr expression_ast = {});
 
 /// Extract from the input stream a set of `name` column values
 template <typename T>
diff --git a/src/Storages/getStructureOfRemoteTable.cpp b/src/Storages/getStructureOfRemoteTable.cpp
index de5f3924ca9..fb828b8f744 100644
--- a/src/Storages/getStructureOfRemoteTable.cpp
+++ b/src/Storages/getStructureOfRemoteTable.cpp
@@ -29,7 +29,7 @@ ColumnsDescription getStructureOfRemoteTableInShard(
     const Cluster & cluster,
     const Cluster::ShardInfo & shard_info,
     const StorageID & table_id,
-    const Context & context,
+    ContextPtr context,
     const ASTPtr & table_func_ptr)
 {
     String query;
@@ -59,7 +59,7 @@ ColumnsDescription getStructureOfRemoteTableInShard(
 
     ColumnsDescription res;
 
-    auto new_context = ClusterProxy::updateSettingsForCluster(cluster, context, context.getSettingsRef());
+    auto new_context = ClusterProxy::updateSettingsForCluster(cluster, context, context->getSettingsRef());
 
     /// Expect only needed columns from the result of DESC TABLE. NOTE 'comment' column is ignored for compatibility reasons.
     Block sample_block
@@ -71,7 +71,7 @@ ColumnsDescription getStructureOfRemoteTableInShard(
     };
 
     /// Execute remote query without restrictions (because it's not real user query, but part of implementation)
-    auto input = std::make_shared<RemoteBlockInputStream>(shard_info.pool, query, sample_block, *new_context);
+    auto input = std::make_shared<RemoteBlockInputStream>(shard_info.pool, query, sample_block, new_context);
     input->setPoolMode(PoolMode::GET_ONE);
     if (!table_func_ptr)
         input->setMainTable(table_id);
@@ -104,7 +104,7 @@ ColumnsDescription getStructureOfRemoteTableInShard(
                 column.default_desc.kind = columnDefaultKindFromString(kind_name);
                 String expr_str = (*default_expr)[i].get<const String &>();
                 column.default_desc.expression = parseQuery(
-                    expr_parser, expr_str.data(), expr_str.data() + expr_str.size(), "default expression", 0, context.getSettingsRef().max_parser_depth);
+                    expr_parser, expr_str.data(), expr_str.data() + expr_str.size(), "default expression", 0, context->getSettingsRef().max_parser_depth);
             }
 
             res.add(column);
@@ -117,7 +117,7 @@ ColumnsDescription getStructureOfRemoteTableInShard(
 ColumnsDescription getStructureOfRemoteTable(
     const Cluster & cluster,
     const StorageID & table_id,
-    const Context & context,
+    ContextPtr context,
     const ASTPtr & table_func_ptr)
 {
     const auto & shards_info = cluster.getShardsInfo();
diff --git a/src/Storages/getStructureOfRemoteTable.h b/src/Storages/getStructureOfRemoteTable.h
index af418144cb0..3f77236c756 100644
--- a/src/Storages/getStructureOfRemoteTable.h
+++ b/src/Storages/getStructureOfRemoteTable.h
@@ -16,7 +16,7 @@ struct StorageID;
 ColumnsDescription getStructureOfRemoteTable(
     const Cluster & cluster,
     const StorageID & table_id,
-    const Context & context,
+    ContextPtr context,
     const ASTPtr & table_func_ptr = nullptr);
 
 }
diff --git a/src/Storages/tests/gtest_background_executor.cpp b/src/Storages/tests/gtest_background_executor.cpp
index 0ddf2d9ea2a..283cdf3fbf8 100644
--- a/src/Storages/tests/gtest_background_executor.cpp
+++ b/src/Storages/tests/gtest_background_executor.cpp
@@ -17,9 +17,9 @@ static std::atomic<Int64> counter{0};
 class TestJobExecutor : public IBackgroundJobExecutor
 {
 public:
-    explicit TestJobExecutor(Context & context)
+    explicit TestJobExecutor(ContextPtr local_context)
         :IBackgroundJobExecutor(
-            context,
+            local_context,
             BackgroundTaskSchedulingSettings{},
             {PoolConfig{PoolType::MERGE_MUTATE, 4, CurrentMetrics::BackgroundPoolTask}})
         {}
@@ -43,7 +43,7 @@ TEST(BackgroundExecutor, TestMetric)
     const auto & context_holder = getContext();
     std::vector<TestExecutorPtr> executors;
     for (size_t i = 0; i < 100; ++i)
-        executors.emplace_back(std::make_unique<TestJobExecutor>(const_cast<Context &>(context_holder.context)));
+        executors.emplace_back(std::make_unique<TestJobExecutor>(context_holder.context));
 
     for (size_t i = 0; i < 100; ++i)
         executors[i]->start();
diff --git a/src/Storages/tests/gtest_storage_log.cpp b/src/Storages/tests/gtest_storage_log.cpp
index cbb894c7420..de2139a4a5a 100644
--- a/src/Storages/tests/gtest_storage_log.cpp
+++ b/src/Storages/tests/gtest_storage_log.cpp
@@ -70,7 +70,7 @@ using DiskImplementations = testing::Types<DB::DiskMemory, DB::DiskLocal>;
 TYPED_TEST_SUITE(StorageLogTest, DiskImplementations);
 
 // Returns data written to table in Values format.
-std::string writeData(int rows, DB::StoragePtr & table, const DB::Context & context)
+std::string writeData(int rows, DB::StoragePtr & table, const DB::ContextPtr context)
 {
     using namespace DB;
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
@@ -108,7 +108,7 @@ std::string writeData(int rows, DB::StoragePtr & table, const DB::Context & cont
 }
 
 // Returns all table data in Values format.
-std::string readData(DB::StoragePtr & table, const DB::Context & context)
+std::string readData(DB::StoragePtr & table, const DB::ContextPtr context)
 {
     using namespace DB;
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
diff --git a/src/Storages/tests/gtest_transform_query_for_external_database.cpp b/src/Storages/tests/gtest_transform_query_for_external_database.cpp
index d40c62fef60..d774fd144cf 100644
--- a/src/Storages/tests/gtest_transform_query_for_external_database.cpp
+++ b/src/Storages/tests/gtest_transform_query_for_external_database.cpp
@@ -22,7 +22,7 @@ struct State
 {
     State(const State&) = delete;
 
-    Context context;
+    ContextPtr context;
 
     static const State & instance()
     {
@@ -74,7 +74,7 @@ private:
     };
 
     explicit State()
-        : context(getContext().context)
+        : context(Context::createCopy(getContext().context))
     {
         tryRegisterFunctions();
         DatabasePtr database = std::make_shared<DatabaseMemory>("test", context);
@@ -88,7 +88,7 @@ private:
                 StorageMemory::create(StorageID(db_name, table_name), ColumnsDescription{getColumns()}, ConstraintsDescription{}));
         }
         DatabaseCatalog::instance().attachDatabase(database->getDatabaseName(), database);
-        context.setCurrentDatabase("test");
+        context->setCurrentDatabase("test");
     }
 };
 
diff --git a/src/Storages/transformQueryForExternalDatabase.cpp b/src/Storages/transformQueryForExternalDatabase.cpp
index 59d357f72e6..b3fe788d874 100644
--- a/src/Storages/transformQueryForExternalDatabase.cpp
+++ b/src/Storages/transformQueryForExternalDatabase.cpp
@@ -88,7 +88,7 @@ public:
     }
 };
 
-void replaceConstantExpressions(ASTPtr & node, const Context & context, const NamesAndTypesList & all_columns)
+void replaceConstantExpressions(ASTPtr & node, ContextPtr context, const NamesAndTypesList & all_columns)
 {
     auto syntax_result = TreeRewriter(context).analyze(node, all_columns);
     Block block_with_constants = KeyCondition::getBlockWithConstants(node, syntax_result, context);
@@ -239,7 +239,7 @@ String transformQueryForExternalDatabase(
     IdentifierQuotingStyle identifier_quoting_style,
     const String & database,
     const String & table,
-    const Context & context)
+    ContextPtr context)
 {
     auto clone_query = query_info.query->clone();
     const Names used_columns = query_info.syntax_analyzer_result->requiredSourceColumns();
diff --git a/src/Storages/transformQueryForExternalDatabase.h b/src/Storages/transformQueryForExternalDatabase.h
index c760c628970..215afab8b30 100644
--- a/src/Storages/transformQueryForExternalDatabase.h
+++ b/src/Storages/transformQueryForExternalDatabase.h
@@ -4,13 +4,13 @@
 #include <Core/NamesAndTypes.h>
 #include <Parsers/IdentifierQuotingStyle.h>
 #include <Storages/SelectQueryInfo.h>
+#include <Interpreters/Context_fwd.h>
 
 
 namespace DB
 {
 
 class IAST;
-class Context;
 
 /** For given ClickHouse query,
   * creates another query in a form of
@@ -29,6 +29,6 @@ String transformQueryForExternalDatabase(
     IdentifierQuotingStyle identifier_quoting_style,
     const String & database,
     const String & table,
-    const Context & context);
+    ContextPtr context);
 
 }
diff --git a/src/TableFunctions/ITableFunction.cpp b/src/TableFunctions/ITableFunction.cpp
index b637838c6da..218d86fe4a2 100644
--- a/src/TableFunctions/ITableFunction.cpp
+++ b/src/TableFunctions/ITableFunction.cpp
@@ -14,11 +14,11 @@ namespace ProfileEvents
 namespace DB
 {
 
-StoragePtr ITableFunction::execute(const ASTPtr & ast_function, const Context & context, const std::string & table_name,
+StoragePtr ITableFunction::execute(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name,
                                    ColumnsDescription cached_columns) const
 {
     ProfileEvents::increment(ProfileEvents::TableFunctionExecute);
-    context.checkAccess(AccessType::CREATE_TEMPORARY_TABLE | StorageFactory::instance().getSourceAccessType(getStorageTypeName()));
+    context->checkAccess(AccessType::CREATE_TEMPORARY_TABLE | StorageFactory::instance().getSourceAccessType(getStorageTypeName()));
 
     if (cached_columns.empty())
         return executeImpl(ast_function, context, table_name, std::move(cached_columns));
@@ -26,12 +26,12 @@ StoragePtr ITableFunction::execute(const ASTPtr & ast_function, const Context &
     /// We have table structure, so it's CREATE AS table_function().
     /// We should use global context here because there will be no query context on server startup
     /// and because storage lifetime is bigger than query context lifetime.
-    const Context & global_context = context.getGlobalContext();
+    auto global_context = context->getGlobalContext();
     if (hasStaticStructure() && cached_columns == getActualTableStructure(context))
         return executeImpl(ast_function, global_context, table_name, std::move(cached_columns));
 
     auto this_table_function = shared_from_this();
-    auto get_storage = [=, &global_context]() -> StoragePtr
+    auto get_storage = [=]() -> StoragePtr
     {
         return this_table_function->executeImpl(ast_function, global_context, table_name, cached_columns);
     };
diff --git a/src/TableFunctions/ITableFunction.h b/src/TableFunctions/ITableFunction.h
index eb5e1618b3c..56147ffd598 100644
--- a/src/TableFunctions/ITableFunction.h
+++ b/src/TableFunctions/ITableFunction.h
@@ -47,18 +47,20 @@ public:
     /// Returns false if storage returned by table function supports type conversion (e.g. StorageDistributed)
     virtual bool needStructureConversion() const { return true; }
 
-    virtual void parseArguments(const ASTPtr & /*ast_function*/, const Context & /*context*/) {}
+    virtual void parseArguments(const ASTPtr & /*ast_function*/, ContextPtr /*context*/) {}
 
     /// Returns actual table structure probably requested from remote server, may fail
-    virtual ColumnsDescription getActualTableStructure(const Context & /*context*/) const = 0;
+    virtual ColumnsDescription getActualTableStructure(ContextPtr /*context*/) const = 0;
 
     /// Create storage according to the query.
-    StoragePtr execute(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns_ = {}) const;
+    StoragePtr
+    execute(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns_ = {}) const;
 
     virtual ~ITableFunction() = default;
 
 private:
-    virtual StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const = 0;
+    virtual StoragePtr executeImpl(
+        const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const = 0;
     virtual const char * getStorageTypeName() const = 0;
 };
 
diff --git a/src/TableFunctions/ITableFunctionFileLike.cpp b/src/TableFunctions/ITableFunctionFileLike.cpp
index 1349c166474..44a917a0f00 100644
--- a/src/TableFunctions/ITableFunctionFileLike.cpp
+++ b/src/TableFunctions/ITableFunctionFileLike.cpp
@@ -26,7 +26,7 @@ namespace ErrorCodes
     extern const int BAD_ARGUMENTS;
 }
 
-void ITableFunctionFileLike::parseArguments(const ASTPtr & ast_function, const Context & context)
+void ITableFunctionFileLike::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     /// Parse args
     ASTs & args_func = ast_function->children;
@@ -64,20 +64,20 @@ void ITableFunctionFileLike::parseArguments(const ASTPtr & ast_function, const C
         compression_method = args[3]->as<ASTLiteral &>().value.safeGet<String>();
 }
 
-StoragePtr ITableFunctionFileLike::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr ITableFunctionFileLike::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
-    StoragePtr storage = getStorage(filename, format, columns, const_cast<Context &>(context), table_name, compression_method);
+    StoragePtr storage = getStorage(filename, format, columns, context, table_name, compression_method);
     storage->startup();
     return storage;
 }
 
-ColumnsDescription ITableFunctionFileLike::getActualTableStructure(const Context & context) const
+ColumnsDescription ITableFunctionFileLike::getActualTableStructure(ContextPtr context) const
 {
     if (structure.empty())
     {
         assert(getName() == "file" && format == "Distributed");
-        Strings paths = StorageFile::getPathsList(filename, context.getUserFilesPath(), context);
+        Strings paths = StorageFile::getPathsList(filename, context->getUserFilesPath(), context);
         if (paths.empty())
             throw Exception("Cannot get table structure from file, because no files match specified name", ErrorCodes::INCORRECT_FILE_NAME);
         auto read_stream = StorageDistributedDirectoryMonitor::createStreamFromFile(paths[0]);
diff --git a/src/TableFunctions/ITableFunctionFileLike.h b/src/TableFunctions/ITableFunctionFileLike.h
index f1c648ac0aa..7c96ce610b3 100644
--- a/src/TableFunctions/ITableFunctionFileLike.h
+++ b/src/TableFunctions/ITableFunctionFileLike.h
@@ -13,15 +13,15 @@ class Context;
 class ITableFunctionFileLike : public ITableFunction
 {
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
 
     virtual StoragePtr getStorage(
-        const String & source, const String & format, const ColumnsDescription & columns, Context & global_context,
+        const String & source, const String & format, const ColumnsDescription & columns, ContextPtr global_context,
         const std::string & table_name, const String & compression_method) const = 0;
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     bool hasStaticStructure() const override { return true; }
 
diff --git a/src/TableFunctions/ITableFunctionXDBC.cpp b/src/TableFunctions/ITableFunctionXDBC.cpp
index 21c78d199db..51431a1e3a6 100644
--- a/src/TableFunctions/ITableFunctionXDBC.cpp
+++ b/src/TableFunctions/ITableFunctionXDBC.cpp
@@ -28,7 +28,7 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-void ITableFunctionXDBC::parseArguments(const ASTPtr & ast_function, const Context & context)
+void ITableFunctionXDBC::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     const auto & args_func = ast_function->as<ASTFunction &>();
 
@@ -57,17 +57,17 @@ void ITableFunctionXDBC::parseArguments(const ASTPtr & ast_function, const Conte
     }
 }
 
-void ITableFunctionXDBC::startBridgeIfNot(const Context & context) const
+void ITableFunctionXDBC::startBridgeIfNot(ContextPtr context) const
 {
     if (!helper)
     {
         /// Have to const_cast, because bridges store their commands inside context
-        helper = createBridgeHelper(const_cast<Context &>(context), context.getSettingsRef().http_receive_timeout.value, connection_string);
+        helper = createBridgeHelper(context, context->getSettingsRef().http_receive_timeout.value, connection_string);
         helper->startBridgeSync();
     }
 }
 
-ColumnsDescription ITableFunctionXDBC::getActualTableStructure(const Context & context) const
+ColumnsDescription ITableFunctionXDBC::getActualTableStructure(ContextPtr context) const
 {
     startBridgeIfNot(context);
 
@@ -78,7 +78,7 @@ ColumnsDescription ITableFunctionXDBC::getActualTableStructure(const Context & c
         columns_info_uri.addQueryParameter("schema", schema_name);
     columns_info_uri.addQueryParameter("table", remote_table_name);
 
-    const auto use_nulls = context.getSettingsRef().external_table_functions_use_nulls;
+    const auto use_nulls = context->getSettingsRef().external_table_functions_use_nulls;
     columns_info_uri.addQueryParameter("external_table_functions_use_nulls",
                                        Poco::NumberFormatter::format(use_nulls));
 
@@ -91,7 +91,7 @@ ColumnsDescription ITableFunctionXDBC::getActualTableStructure(const Context & c
     return ColumnsDescription{columns};
 }
 
-StoragePtr ITableFunctionXDBC::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr ITableFunctionXDBC::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     startBridgeIfNot(context);
     auto columns = getActualTableStructure(context);
diff --git a/src/TableFunctions/ITableFunctionXDBC.h b/src/TableFunctions/ITableFunctionXDBC.h
index 7e8e090c8f3..a58d574513f 100644
--- a/src/TableFunctions/ITableFunctionXDBC.h
+++ b/src/TableFunctions/ITableFunctionXDBC.h
@@ -18,18 +18,18 @@ namespace DB
 class ITableFunctionXDBC : public ITableFunction
 {
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
 
     /* A factory method to create bridge helper, that will assist in remote interaction */
-    virtual BridgeHelperPtr createBridgeHelper(Context & context,
+    virtual BridgeHelperPtr createBridgeHelper(ContextPtr context,
         const Poco::Timespan & http_timeout_,
         const std::string & connection_string_) const = 0;
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
-    void startBridgeIfNot(const Context & context) const;
+    void startBridgeIfNot(ContextPtr context) const;
 
     String connection_string;
     String schema_name;
@@ -47,7 +47,7 @@ public:
     }
 
 private:
-    BridgeHelperPtr createBridgeHelper(Context & context,
+    BridgeHelperPtr createBridgeHelper(ContextPtr context,
         const Poco::Timespan & http_timeout_,
         const std::string & connection_string_) const override
     {
@@ -67,7 +67,7 @@ public:
     }
 
 private:
-    BridgeHelperPtr createBridgeHelper(Context & context,
+    BridgeHelperPtr createBridgeHelper(ContextPtr context,
         const Poco::Timespan & http_timeout_,
         const std::string & connection_string_) const override
     {
diff --git a/src/TableFunctions/TableFunctionDictionary.cpp b/src/TableFunctions/TableFunctionDictionary.cpp
index 722ffccc07d..46d3183bba9 100644
--- a/src/TableFunctions/TableFunctionDictionary.cpp
+++ b/src/TableFunctions/TableFunctionDictionary.cpp
@@ -19,7 +19,7 @@ namespace ErrorCodes
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 }
 
-void TableFunctionDictionary::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionDictionary::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     // Parse args
     ASTs & args_func = ast_function->children;
@@ -38,9 +38,9 @@ void TableFunctionDictionary::parseArguments(const ASTPtr & ast_function, const
     dictionary_name = args[0]->as<ASTLiteral &>().value.safeGet<String>();
 }
 
-ColumnsDescription TableFunctionDictionary::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionDictionary::getActualTableStructure(ContextPtr context) const
 {
-    const ExternalDictionariesLoader & external_loader = context.getExternalDictionariesLoader();
+    const ExternalDictionariesLoader & external_loader = context->getExternalDictionariesLoader();
     auto dictionary_structure = external_loader.getDictionaryStructure(dictionary_name, context);
     auto result = ColumnsDescription(StorageDictionary::getNamesAndTypes(dictionary_structure));
 
@@ -48,7 +48,7 @@ ColumnsDescription TableFunctionDictionary::getActualTableStructure(const Contex
 }
 
 StoragePtr TableFunctionDictionary::executeImpl(
-    const ASTPtr &, const Context & context, const std::string & table_name, ColumnsDescription) const
+    const ASTPtr &, ContextPtr context, const std::string & table_name, ColumnsDescription) const
 {
     StorageID dict_id(getDatabaseName(), table_name);
     auto dictionary_table_structure = getActualTableStructure(context);
diff --git a/src/TableFunctions/TableFunctionDictionary.h b/src/TableFunctions/TableFunctionDictionary.h
index 8c518eb7929..aed435bebfd 100644
--- a/src/TableFunctions/TableFunctionDictionary.h
+++ b/src/TableFunctions/TableFunctionDictionary.h
@@ -20,11 +20,11 @@ public:
         return name;
     }
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription) const override;
 
     const char * getStorageTypeName() const override { return "Dictionary"; }
 
diff --git a/src/TableFunctions/TableFunctionFactory.cpp b/src/TableFunctions/TableFunctionFactory.cpp
index e8f844e8074..15e61354f6d 100644
--- a/src/TableFunctions/TableFunctionFactory.cpp
+++ b/src/TableFunctions/TableFunctionFactory.cpp
@@ -31,7 +31,7 @@ void TableFunctionFactory::registerFunction(const std::string & name, Value crea
 
 TableFunctionPtr TableFunctionFactory::get(
     const ASTPtr & ast_function,
-    const Context & context) const
+    ContextPtr context) const
 {
     const auto * table_function = ast_function->as<ASTFunction>();
     auto res = tryGet(table_function->name, context);
@@ -50,7 +50,7 @@ TableFunctionPtr TableFunctionFactory::get(
 
 TableFunctionPtr TableFunctionFactory::tryGet(
         const std::string & name_param,
-        const Context &) const
+        ContextPtr) const
 {
     String name = getAliasToOrName(name_param);
     TableFunctionPtr res;
@@ -70,7 +70,7 @@ TableFunctionPtr TableFunctionFactory::tryGet(
 
     if (CurrentThread::isInitialized())
     {
-        const auto * query_context = CurrentThread::get().getQueryContext();
+        auto query_context = CurrentThread::get().getQueryContext();
         if (query_context && query_context->getSettingsRef().log_queries)
             query_context->addQueryFactoriesInfo(Context::QueryLogFactories::TableFunction, name);
     }
diff --git a/src/TableFunctions/TableFunctionFactory.h b/src/TableFunctions/TableFunctionFactory.h
index 820b5eb1c7b..59b4ffb9fd5 100644
--- a/src/TableFunctions/TableFunctionFactory.h
+++ b/src/TableFunctions/TableFunctionFactory.h
@@ -41,10 +41,10 @@ public:
     }
 
     /// Throws an exception if not found.
-    TableFunctionPtr get(const ASTPtr & ast_function, const Context & context) const;
+    TableFunctionPtr get(const ASTPtr & ast_function, ContextPtr context) const;
 
     /// Returns nullptr if not found.
-    TableFunctionPtr tryGet(const std::string & name, const Context & context) const;
+    TableFunctionPtr tryGet(const std::string & name, ContextPtr context) const;
 
     bool isTableFunctionName(const std::string & name) const;
 
diff --git a/src/TableFunctions/TableFunctionFile.cpp b/src/TableFunctions/TableFunctionFile.cpp
index 13ac6dc2145..6ecb5606d56 100644
--- a/src/TableFunctions/TableFunctionFile.cpp
+++ b/src/TableFunctions/TableFunctionFile.cpp
@@ -12,20 +12,23 @@ namespace DB
 {
 StoragePtr TableFunctionFile::getStorage(const String & source,
     const String & format_, const ColumnsDescription & columns,
-    Context & global_context, const std::string & table_name,
+    ContextPtr global_context, const std::string & table_name,
     const std::string & compression_method_) const
 {
     // For `file` table function, we are going to use format settings from the
     // query context.
-    StorageFile::CommonArguments args{StorageID(getDatabaseName(), table_name),
+    StorageFile::CommonArguments args
+    {
+        WithContext(global_context),
+        StorageID(getDatabaseName(), table_name),
         format_,
         std::nullopt /*format settings*/,
         compression_method_,
         columns,
         ConstraintsDescription{},
-        global_context};
+    };
 
-    return StorageFile::create(source, global_context.getUserFilesPath(), args);
+    return StorageFile::create(source, global_context->getUserFilesPath(), args);
 }
 
 void registerTableFunctionFile(TableFunctionFactory & factory)
diff --git a/src/TableFunctions/TableFunctionFile.h b/src/TableFunctions/TableFunctionFile.h
index 02704e4bf7f..460656a7218 100644
--- a/src/TableFunctions/TableFunctionFile.h
+++ b/src/TableFunctions/TableFunctionFile.h
@@ -5,7 +5,6 @@
 
 namespace DB
 {
-class Context;
 
 /* file(path, format, structure) - creates a temporary storage from file
  *
@@ -23,7 +22,7 @@ public:
 
 private:
     StoragePtr getStorage(
-        const String & source, const String & format_, const ColumnsDescription & columns, Context & global_context,
+        const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
         const std::string & table_name, const std::string & compression_method_) const override;
     const char * getStorageTypeName() const override { return "File"; }
 };}
diff --git a/src/TableFunctions/TableFunctionGenerateRandom.cpp b/src/TableFunctions/TableFunctionGenerateRandom.cpp
index 15c2c2bfa1f..b19be7bd7a3 100644
--- a/src/TableFunctions/TableFunctionGenerateRandom.cpp
+++ b/src/TableFunctions/TableFunctionGenerateRandom.cpp
@@ -26,7 +26,7 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-void TableFunctionGenerateRandom::parseArguments(const ASTPtr & ast_function, const Context & /*context*/)
+void TableFunctionGenerateRandom::parseArguments(const ASTPtr & ast_function, ContextPtr /*context*/)
 {
     ASTs & args_func = ast_function->children;
 
@@ -74,12 +74,12 @@ void TableFunctionGenerateRandom::parseArguments(const ASTPtr & ast_function, co
         max_array_length = args[3]->as<const ASTLiteral &>().value.safeGet<UInt64>();
 }
 
-ColumnsDescription TableFunctionGenerateRandom::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionGenerateRandom::getActualTableStructure(ContextPtr context) const
 {
     return parseColumnsListFromString(structure, context);
 }
 
-StoragePtr TableFunctionGenerateRandom::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionGenerateRandom::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
     auto res = StorageGenerateRandom::create(StorageID(getDatabaseName(), table_name), columns, max_array_length, max_string_length, random_seed);
diff --git a/src/TableFunctions/TableFunctionGenerateRandom.h b/src/TableFunctions/TableFunctionGenerateRandom.h
index 1d8839ba6d4..bcad11156be 100644
--- a/src/TableFunctions/TableFunctionGenerateRandom.h
+++ b/src/TableFunctions/TableFunctionGenerateRandom.h
@@ -15,11 +15,11 @@ public:
     std::string getName() const override { return name; }
     bool hasStaticStructure() const override { return true; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "GenerateRandom"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String structure;
     UInt64 max_string_length = 10;
diff --git a/src/TableFunctions/TableFunctionHDFS.cpp b/src/TableFunctions/TableFunctionHDFS.cpp
index 700cb93ca06..714c6ea1f59 100644
--- a/src/TableFunctions/TableFunctionHDFS.cpp
+++ b/src/TableFunctions/TableFunctionHDFS.cpp
@@ -10,7 +10,7 @@
 namespace DB
 {
 StoragePtr TableFunctionHDFS::getStorage(
-    const String & source, const String & format_, const ColumnsDescription & columns, Context & global_context,
+    const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
     const std::string & table_name, const String & compression_method_) const
 {
     return StorageHDFS::create(
diff --git a/src/TableFunctions/TableFunctionHDFS.h b/src/TableFunctions/TableFunctionHDFS.h
index 47e040f7593..d9ee9b47868 100644
--- a/src/TableFunctions/TableFunctionHDFS.h
+++ b/src/TableFunctions/TableFunctionHDFS.h
@@ -26,7 +26,7 @@ public:
 
 private:
     StoragePtr getStorage(
-        const String & source, const String & format_, const ColumnsDescription & columns, Context & global_context,
+        const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
         const std::string & table_name, const String & compression_method_) const override;
     const char * getStorageTypeName() const override { return "HDFS"; }
 };
diff --git a/src/TableFunctions/TableFunctionInput.cpp b/src/TableFunctions/TableFunctionInput.cpp
index 41c41835434..677a6ff3ce4 100644
--- a/src/TableFunctions/TableFunctionInput.cpp
+++ b/src/TableFunctions/TableFunctionInput.cpp
@@ -22,7 +22,7 @@ namespace ErrorCodes
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 }
 
-void TableFunctionInput::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionInput::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     const auto * function = ast_function->as<ASTFunction>();
 
@@ -38,12 +38,12 @@ void TableFunctionInput::parseArguments(const ASTPtr & ast_function, const Conte
     structure = evaluateConstantExpressionOrIdentifierAsLiteral(args[0], context)->as<ASTLiteral &>().value.safeGet<String>();
 }
 
-ColumnsDescription TableFunctionInput::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionInput::getActualTableStructure(ContextPtr context) const
 {
     return parseColumnsListFromString(structure, context);
 }
 
-StoragePtr TableFunctionInput::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionInput::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto storage = StorageInput::create(StorageID(getDatabaseName(), table_name), getActualTableStructure(context));
     storage->startup();
diff --git a/src/TableFunctions/TableFunctionInput.h b/src/TableFunctions/TableFunctionInput.h
index 5809d48a77c..5953693e711 100644
--- a/src/TableFunctions/TableFunctionInput.h
+++ b/src/TableFunctions/TableFunctionInput.h
@@ -18,11 +18,11 @@ public:
     bool hasStaticStructure() const override { return true; }
 
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "Input"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String structure;
 };
diff --git a/src/TableFunctions/TableFunctionMerge.cpp b/src/TableFunctions/TableFunctionMerge.cpp
index c5fb9a7686d..6d10b0d04b6 100644
--- a/src/TableFunctions/TableFunctionMerge.cpp
+++ b/src/TableFunctions/TableFunctionMerge.cpp
@@ -33,7 +33,7 @@ namespace
 }
 
 
-void TableFunctionMerge::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionMerge::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     ASTs & args_func = ast_function->children;
 
@@ -57,7 +57,7 @@ void TableFunctionMerge::parseArguments(const ASTPtr & ast_function, const Conte
 }
 
 
-const Strings & TableFunctionMerge::getSourceTables(const Context & context) const
+const Strings & TableFunctionMerge::getSourceTables(ContextPtr context) const
 {
     if (source_tables)
         return *source_tables;
@@ -67,7 +67,7 @@ const Strings & TableFunctionMerge::getSourceTables(const Context & context) con
     OptimizedRegularExpression re(source_table_regexp);
     auto table_name_match = [&](const String & table_name_) { return re.match(table_name_); };
 
-    auto access = context.getAccess();
+    auto access = context->getAccess();
     bool granted_show_on_all_tables = access->isGranted(AccessType::SHOW_TABLES, source_database);
     bool granted_select_on_all_tables = access->isGranted(AccessType::SELECT, source_database);
 
@@ -91,7 +91,7 @@ const Strings & TableFunctionMerge::getSourceTables(const Context & context) con
 }
 
 
-ColumnsDescription TableFunctionMerge::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionMerge::getActualTableStructure(ContextPtr context) const
 {
     for (const auto & table_name : getSourceTables(context))
     {
@@ -104,7 +104,7 @@ ColumnsDescription TableFunctionMerge::getActualTableStructure(const Context & c
 }
 
 
-StoragePtr TableFunctionMerge::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionMerge::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto res = StorageMerge::create(
         StorageID(getDatabaseName(), table_name),
diff --git a/src/TableFunctions/TableFunctionMerge.h b/src/TableFunctions/TableFunctionMerge.h
index 8f9f4522d17..04027b9d76a 100644
--- a/src/TableFunctions/TableFunctionMerge.h
+++ b/src/TableFunctions/TableFunctionMerge.h
@@ -16,12 +16,12 @@ public:
     static constexpr auto name = "merge";
     std::string getName() const override { return name; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "Merge"; }
 
-    const Strings & getSourceTables(const Context & context) const;
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    const Strings & getSourceTables(ContextPtr context) const;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String source_database;
     String source_table_regexp;
diff --git a/src/TableFunctions/TableFunctionMySQL.cpp b/src/TableFunctions/TableFunctionMySQL.cpp
index d29cb8d55c2..c7dda873a00 100644
--- a/src/TableFunctions/TableFunctionMySQL.cpp
+++ b/src/TableFunctions/TableFunctionMySQL.cpp
@@ -38,7 +38,7 @@ namespace ErrorCodes
     extern const int UNKNOWN_TABLE;
 }
 
-void TableFunctionMySQL::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionMySQL::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     const auto & args_func = ast_function->as<ASTFunction &>();
 
@@ -61,7 +61,7 @@ void TableFunctionMySQL::parseArguments(const ASTPtr & ast_function, const Conte
     password = args[4]->as<ASTLiteral &>().value.safeGet<String>();
 
     /// Split into replicas if needed. 3306 is the default MySQL port number
-    size_t max_addresses = context.getSettingsRef().glob_expansion_max_elements;
+    size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
     auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 3306);
     pool.emplace(remote_database_name, addresses, user_name, password);
 
@@ -76,9 +76,9 @@ void TableFunctionMySQL::parseArguments(const ASTPtr & ast_function, const Conte
             ErrorCodes::BAD_ARGUMENTS);
 }
 
-ColumnsDescription TableFunctionMySQL::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionMySQL::getActualTableStructure(ContextPtr context) const
 {
-    const auto & settings = context.getSettingsRef();
+    const auto & settings = context->getSettingsRef();
     const auto tables_and_columns = fetchTablesColumnsList(*pool, remote_database_name, {remote_table_name}, settings.external_table_functions_use_nulls, settings.mysql_datatypes_support_level);
 
     const auto columns = tables_and_columns.find(remote_table_name);
@@ -88,7 +88,7 @@ ColumnsDescription TableFunctionMySQL::getActualTableStructure(const Context & c
     return ColumnsDescription{columns->second};
 }
 
-StoragePtr TableFunctionMySQL::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionMySQL::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
 
diff --git a/src/TableFunctions/TableFunctionMySQL.h b/src/TableFunctions/TableFunctionMySQL.h
index aa155779fe4..64c7d56cf2a 100644
--- a/src/TableFunctions/TableFunctionMySQL.h
+++ b/src/TableFunctions/TableFunctionMySQL.h
@@ -24,11 +24,11 @@ public:
         return name;
     }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "MySQL"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String remote_database_name;
     String remote_table_name;
diff --git a/src/TableFunctions/TableFunctionNull.cpp b/src/TableFunctions/TableFunctionNull.cpp
index 6abe0319394..334d7c3dcbd 100644
--- a/src/TableFunctions/TableFunctionNull.cpp
+++ b/src/TableFunctions/TableFunctionNull.cpp
@@ -17,7 +17,7 @@ namespace ErrorCodes
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 }
 
-void TableFunctionNull::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionNull::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     const auto * function = ast_function->as<ASTFunction>();
     if (!function || !function->arguments)
@@ -30,12 +30,12 @@ void TableFunctionNull::parseArguments(const ASTPtr & ast_function, const Contex
     structure = evaluateConstantExpressionOrIdentifierAsLiteral(arguments[0], context)->as<ASTLiteral>()->value.safeGet<String>();
 }
 
-ColumnsDescription TableFunctionNull::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionNull::getActualTableStructure(ContextPtr context) const
 {
     return parseColumnsListFromString(structure, context);
 }
 
-StoragePtr TableFunctionNull::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionNull::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
     auto res = StorageNull::create(StorageID(getDatabaseName(), table_name), columns, ConstraintsDescription());
diff --git a/src/TableFunctions/TableFunctionNull.h b/src/TableFunctions/TableFunctionNull.h
index 4d4cecb0292..6734fb8efb6 100644
--- a/src/TableFunctions/TableFunctionNull.h
+++ b/src/TableFunctions/TableFunctionNull.h
@@ -17,11 +17,11 @@ public:
     static constexpr auto name = "null";
     std::string getName() const override { return name; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const String & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const String & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "Null"; }
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
     String structure;
 };
diff --git a/src/TableFunctions/TableFunctionNumbers.cpp b/src/TableFunctions/TableFunctionNumbers.cpp
index 594075b1c82..01ffd2b2e3d 100644
--- a/src/TableFunctions/TableFunctionNumbers.cpp
+++ b/src/TableFunctions/TableFunctionNumbers.cpp
@@ -23,14 +23,14 @@ namespace ErrorCodes
 
 
 template <bool multithreaded>
-ColumnsDescription TableFunctionNumbers<multithreaded>::getActualTableStructure(const Context & /*context*/) const
+ColumnsDescription TableFunctionNumbers<multithreaded>::getActualTableStructure(ContextPtr /*context*/) const
 {
     /// NOTE: https://bugs.llvm.org/show_bug.cgi?id=47418
     return ColumnsDescription{{{"number", std::make_shared<DataTypeUInt64>()}}};
 }
 
 template <bool multithreaded>
-StoragePtr TableFunctionNumbers<multithreaded>::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionNumbers<multithreaded>::executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     if (const auto * function = ast_function->as<ASTFunction>())
     {
@@ -56,7 +56,7 @@ void registerTableFunctionNumbers(TableFunctionFactory & factory)
 }
 
 template <bool multithreaded>
-UInt64 TableFunctionNumbers<multithreaded>::evaluateArgument(const Context & context, ASTPtr & argument) const
+UInt64 TableFunctionNumbers<multithreaded>::evaluateArgument(ContextPtr context, ASTPtr & argument) const
 {
     const auto & [field, type] = evaluateConstantExpression(argument, context);
 
diff --git a/src/TableFunctions/TableFunctionNumbers.h b/src/TableFunctions/TableFunctionNumbers.h
index c27bb7319ba..6cee752390e 100644
--- a/src/TableFunctions/TableFunctionNumbers.h
+++ b/src/TableFunctions/TableFunctionNumbers.h
@@ -19,12 +19,12 @@ public:
     std::string getName() const override { return name; }
     bool hasStaticStructure() const override { return true; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "SystemNumbers"; }
 
-    UInt64 evaluateArgument(const Context & context, ASTPtr & argument) const;
+    UInt64 evaluateArgument(ContextPtr context, ASTPtr & argument) const;
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 };
 
 
diff --git a/src/TableFunctions/TableFunctionPostgreSQL.cpp b/src/TableFunctions/TableFunctionPostgreSQL.cpp
index e1ee6df1ba1..6e7ba1825fc 100644
--- a/src/TableFunctions/TableFunctionPostgreSQL.cpp
+++ b/src/TableFunctions/TableFunctionPostgreSQL.cpp
@@ -26,7 +26,7 @@ namespace ErrorCodes
 
 
 StoragePtr TableFunctionPostgreSQL::executeImpl(const ASTPtr & /*ast_function*/,
-        const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+        ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
     auto result = std::make_shared<StoragePostgreSQL>(
@@ -38,9 +38,9 @@ StoragePtr TableFunctionPostgreSQL::executeImpl(const ASTPtr & /*ast_function*/,
 }
 
 
-ColumnsDescription TableFunctionPostgreSQL::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionPostgreSQL::getActualTableStructure(ContextPtr context) const
 {
-    const bool use_nulls = context.getSettingsRef().external_table_functions_use_nulls;
+    const bool use_nulls = context->getSettingsRef().external_table_functions_use_nulls;
     auto columns = fetchPostgreSQLTableStructure(
             connection_pool->get(),
             remote_table_schema.empty() ? doubleQuoteString(remote_table_name)
@@ -51,7 +51,7 @@ ColumnsDescription TableFunctionPostgreSQL::getActualTableStructure(const Contex
 }
 
 
-void TableFunctionPostgreSQL::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionPostgreSQL::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     const auto & func_args = ast_function->as<ASTFunction &>();
 
@@ -70,7 +70,7 @@ void TableFunctionPostgreSQL::parseArguments(const ASTPtr & ast_function, const
 
     /// Split into replicas if needed. 5432 is a default postgresql port.
     const auto & host_port = args[0]->as<ASTLiteral &>().value.safeGet<String>();
-    size_t max_addresses = context.getSettingsRef().glob_expansion_max_elements;
+    size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
     auto addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 5432);
 
     remote_table_name = args[2]->as<ASTLiteral &>().value.safeGet<String>();
diff --git a/src/TableFunctions/TableFunctionPostgreSQL.h b/src/TableFunctions/TableFunctionPostgreSQL.h
index 96d46b4fe5a..44f804fbb30 100644
--- a/src/TableFunctions/TableFunctionPostgreSQL.h
+++ b/src/TableFunctions/TableFunctionPostgreSQL.h
@@ -19,13 +19,13 @@ public:
 
 private:
     StoragePtr executeImpl(
-            const ASTPtr & ast_function, const Context & context,
+            const ASTPtr & ast_function, ContextPtr context,
             const std::string & table_name, ColumnsDescription cached_columns) const override;
 
     const char * getStorageTypeName() const override { return "PostgreSQL"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String connection_str;
     String remote_table_name, remote_table_schema;
diff --git a/src/TableFunctions/TableFunctionRemote.cpp b/src/TableFunctions/TableFunctionRemote.cpp
index 0e7623c0ac3..ab2458b64f4 100644
--- a/src/TableFunctions/TableFunctionRemote.cpp
+++ b/src/TableFunctions/TableFunctionRemote.cpp
@@ -28,7 +28,7 @@ namespace ErrorCodes
 }
 
 
-void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     ASTs & args_func = ast_function->children;
 
@@ -162,14 +162,14 @@ void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, const Cont
     {
         /// Use an existing cluster from the main config
         if (name != "clusterAllReplicas")
-            cluster = context.getCluster(cluster_name);
+            cluster = context->getCluster(cluster_name);
         else
-            cluster = context.getCluster(cluster_name)->getClusterWithReplicasAsShards(context.getSettings());
+            cluster = context->getCluster(cluster_name)->getClusterWithReplicasAsShards(context->getSettings());
     }
     else
     {
         /// Create new cluster from the scratch
-        size_t max_addresses = context.getSettingsRef().table_function_remote_max_addresses;
+        size_t max_addresses = context->getSettingsRef().table_function_remote_max_addresses;
         std::vector<String> shards = parseRemoteDescription(cluster_description, 0, cluster_description.size(), ',', max_addresses);
 
         std::vector<std::vector<String>> names;
@@ -180,7 +180,7 @@ void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, const Cont
         if (names.empty())
             throw Exception("Shard list is empty after parsing first argument", ErrorCodes::BAD_ARGUMENTS);
 
-        auto maybe_secure_port = context.getTCPPortSecure();
+        auto maybe_secure_port = context->getTCPPortSecure();
 
         /// Check host and port on affiliation allowed hosts.
         for (const auto & hosts : names)
@@ -189,20 +189,20 @@ void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, const Cont
             {
                 size_t colon = host.find(':');
                 if (colon == String::npos)
-                    context.getRemoteHostFilter().checkHostAndPort(
+                    context->getRemoteHostFilter().checkHostAndPort(
                         host,
-                        toString((secure ? (maybe_secure_port ? *maybe_secure_port : DBMS_DEFAULT_SECURE_PORT) : context.getTCPPort())));
+                        toString((secure ? (maybe_secure_port ? *maybe_secure_port : DBMS_DEFAULT_SECURE_PORT) : context->getTCPPort())));
                 else
-                    context.getRemoteHostFilter().checkHostAndPort(host.substr(0, colon), host.substr(colon + 1));
+                    context->getRemoteHostFilter().checkHostAndPort(host.substr(0, colon), host.substr(colon + 1));
             }
         }
 
         cluster = std::make_shared<Cluster>(
-            context.getSettings(),
+            context->getSettings(),
             names,
             username,
             password,
-            (secure ? (maybe_secure_port ? *maybe_secure_port : DBMS_DEFAULT_SECURE_PORT) : context.getTCPPort()),
+            (secure ? (maybe_secure_port ? *maybe_secure_port : DBMS_DEFAULT_SECURE_PORT) : context->getTCPPort()),
             false,
             secure);
     }
@@ -214,7 +214,7 @@ void TableFunctionRemote::parseArguments(const ASTPtr & ast_function, const Cont
     remote_table_id.table_name = remote_table;
 }
 
-StoragePtr TableFunctionRemote::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const
+StoragePtr TableFunctionRemote::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const
 {
     /// StorageDistributed supports mismatching structure of remote table, so we can use outdated structure for CREATE ... AS remote(...)
     /// without additional conversion in StorageTableFunctionProxy
@@ -255,7 +255,7 @@ StoragePtr TableFunctionRemote::executeImpl(const ASTPtr & /*ast_function*/, con
     return res;
 }
 
-ColumnsDescription TableFunctionRemote::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionRemote::getActualTableStructure(ContextPtr context) const
 {
     assert(cluster);
     return getStructureOfRemoteTable(*cluster, remote_table_id, context, remote_table_function_ptr);
diff --git a/src/TableFunctions/TableFunctionRemote.h b/src/TableFunctions/TableFunctionRemote.h
index d485440d604..8fc918dfc20 100644
--- a/src/TableFunctions/TableFunctionRemote.h
+++ b/src/TableFunctions/TableFunctionRemote.h
@@ -22,15 +22,15 @@ public:
 
     std::string getName() const override { return name; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
     bool needStructureConversion() const override { return false; }
 
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "Distributed"; }
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     std::string name;
     bool is_cluster_function;
diff --git a/src/TableFunctions/TableFunctionS3.cpp b/src/TableFunctions/TableFunctionS3.cpp
index 6dc9230ca46..1a67bae48b0 100644
--- a/src/TableFunctions/TableFunctionS3.cpp
+++ b/src/TableFunctions/TableFunctionS3.cpp
@@ -21,7 +21,7 @@ namespace ErrorCodes
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 }
 
-void TableFunctionS3::parseArguments(const ASTPtr & ast_function, const Context & context)
+void TableFunctionS3::parseArguments(const ASTPtr & ast_function, ContextPtr context)
 {
     /// Parse args
     ASTs & args_func = ast_function->children;
@@ -57,18 +57,18 @@ void TableFunctionS3::parseArguments(const ASTPtr & ast_function, const Context
         compression_method = args.back()->as<ASTLiteral &>().value.safeGet<String>();
 }
 
-ColumnsDescription TableFunctionS3::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionS3::getActualTableStructure(ContextPtr context) const
 {
     return parseColumnsListFromString(structure, context);
 }
 
-StoragePtr TableFunctionS3::executeImpl(const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionS3::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     Poco::URI uri (filename);
     S3::URI s3_uri (uri);
-    UInt64 min_upload_part_size = context.getSettingsRef().s3_min_upload_part_size;
-    UInt64 max_single_part_upload_size = context.getSettingsRef().s3_max_single_part_upload_size;
-    UInt64 max_connections = context.getSettingsRef().s3_max_connections;
+    UInt64 min_upload_part_size = context->getSettingsRef().s3_min_upload_part_size;
+    UInt64 max_single_part_upload_size = context->getSettingsRef().s3_max_single_part_upload_size;
+    UInt64 max_connections = context->getSettingsRef().s3_max_connections;
 
     StoragePtr storage = StorageS3::create(
             s3_uri,
@@ -81,7 +81,7 @@ StoragePtr TableFunctionS3::executeImpl(const ASTPtr & /*ast_function*/, const C
             max_connections,
             getActualTableStructure(context),
             ConstraintsDescription{},
-            const_cast<Context &>(context),
+            context,
             compression_method);
 
     storage->startup();
diff --git a/src/TableFunctions/TableFunctionS3.h b/src/TableFunctions/TableFunctionS3.h
index 722fb9eb23c..1835fa3daa9 100644
--- a/src/TableFunctions/TableFunctionS3.h
+++ b/src/TableFunctions/TableFunctionS3.h
@@ -27,14 +27,14 @@ public:
 protected:
     StoragePtr executeImpl(
         const ASTPtr & ast_function,
-        const Context & context,
+        ContextPtr context,
         const std::string & table_name,
         ColumnsDescription cached_columns) const override;
 
     const char * getStorageTypeName() const override { return "S3"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String filename;
     String format;
diff --git a/src/TableFunctions/TableFunctionURL.cpp b/src/TableFunctions/TableFunctionURL.cpp
index 1c0109e892b..a77b9140508 100644
--- a/src/TableFunctions/TableFunctionURL.cpp
+++ b/src/TableFunctions/TableFunctionURL.cpp
@@ -12,7 +12,7 @@
 namespace DB
 {
 StoragePtr TableFunctionURL::getStorage(
-    const String & source, const String & format_, const ColumnsDescription & columns, Context & global_context,
+    const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
     const std::string & table_name, const String & compression_method_) const
 {
     Poco::URI uri(source);
diff --git a/src/TableFunctions/TableFunctionURL.h b/src/TableFunctions/TableFunctionURL.h
index 5eb027e2b8a..fde361e8bbb 100644
--- a/src/TableFunctions/TableFunctionURL.h
+++ b/src/TableFunctions/TableFunctionURL.h
@@ -21,7 +21,7 @@ public:
 
 private:
     StoragePtr getStorage(
-        const String & source, const String & format_, const ColumnsDescription & columns, Context & global_context,
+        const String & source, const String & format_, const ColumnsDescription & columns, ContextPtr global_context,
         const std::string & table_name, const String & compression_method_) const override;
     const char * getStorageTypeName() const override { return "URL"; }
 };
diff --git a/src/TableFunctions/TableFunctionValues.cpp b/src/TableFunctions/TableFunctionValues.cpp
index 4127a30892f..c66ebe7322e 100644
--- a/src/TableFunctions/TableFunctionValues.cpp
+++ b/src/TableFunctions/TableFunctionValues.cpp
@@ -30,7 +30,7 @@ namespace ErrorCodes
     extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 }
 
-static void parseAndInsertValues(MutableColumns & res_columns, const ASTs & args, const Block & sample_block, const Context & context)
+static void parseAndInsertValues(MutableColumns & res_columns, const ASTs & args, const Block & sample_block, ContextPtr context)
 {
     if (res_columns.size() == 1) /// Parsing arguments as Fields
     {
@@ -68,7 +68,7 @@ static void parseAndInsertValues(MutableColumns & res_columns, const ASTs & args
     }
 }
 
-void TableFunctionValues::parseArguments(const ASTPtr & ast_function, const Context & /*context*/)
+void TableFunctionValues::parseArguments(const ASTPtr & ast_function, ContextPtr /*context*/)
 {
     ASTs & args_func = ast_function->children;
 
@@ -93,12 +93,12 @@ void TableFunctionValues::parseArguments(const ASTPtr & ast_function, const Cont
     structure = args[0]->as<ASTLiteral &>().value.safeGet<String>();
 }
 
-ColumnsDescription TableFunctionValues::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionValues::getActualTableStructure(ContextPtr context) const
 {
     return parseColumnsListFromString(structure, context);
 }
 
-StoragePtr TableFunctionValues::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionValues::executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
 
diff --git a/src/TableFunctions/TableFunctionValues.h b/src/TableFunctions/TableFunctionValues.h
index 549fa2de507..058f5f1d2ed 100644
--- a/src/TableFunctions/TableFunctionValues.h
+++ b/src/TableFunctions/TableFunctionValues.h
@@ -14,11 +14,11 @@ public:
     std::string getName() const override { return name; }
     bool hasStaticStructure() const override { return true; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "Values"; }
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
 
     String structure;
 };
diff --git a/src/TableFunctions/TableFunctionView.cpp b/src/TableFunctions/TableFunctionView.cpp
index 62a833dabc4..3f51e0bbc95 100644
--- a/src/TableFunctions/TableFunctionView.cpp
+++ b/src/TableFunctions/TableFunctionView.cpp
@@ -15,7 +15,7 @@ namespace ErrorCodes
     extern const int BAD_ARGUMENTS;
 }
 
-void TableFunctionView::parseArguments(const ASTPtr & ast_function, const Context & /*context*/)
+void TableFunctionView::parseArguments(const ASTPtr & ast_function, ContextPtr /*context*/)
 {
     const auto * function = ast_function->as<ASTFunction>();
     if (function)
@@ -29,7 +29,7 @@ void TableFunctionView::parseArguments(const ASTPtr & ast_function, const Contex
     throw Exception("Table function '" + getName() + "' requires a query argument.", ErrorCodes::BAD_ARGUMENTS);
 }
 
-ColumnsDescription TableFunctionView::getActualTableStructure(const Context & context) const
+ColumnsDescription TableFunctionView::getActualTableStructure(ContextPtr context) const
 {
     assert(create.select);
     assert(create.children.size() == 1);
@@ -39,7 +39,7 @@ ColumnsDescription TableFunctionView::getActualTableStructure(const Context & co
 }
 
 StoragePtr TableFunctionView::executeImpl(
-    const ASTPtr & /*ast_function*/, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+    const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     auto columns = getActualTableStructure(context);
     auto res = StorageView::create(StorageID(getDatabaseName(), table_name), create, columns);
diff --git a/src/TableFunctions/TableFunctionView.h b/src/TableFunctions/TableFunctionView.h
index 0ed66ff712c..9ef634746eb 100644
--- a/src/TableFunctions/TableFunctionView.h
+++ b/src/TableFunctions/TableFunctionView.h
@@ -17,11 +17,11 @@ public:
     static constexpr auto name = "view";
     std::string getName() const override { return name; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const String & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const String & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "View"; }
 
-    void parseArguments(const ASTPtr & ast_function, const Context & context) override;
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 
     ASTCreateQuery create;
 };
diff --git a/src/TableFunctions/TableFunctionZeros.cpp b/src/TableFunctions/TableFunctionZeros.cpp
index 9b0c6c6e78b..9fd14eec4af 100644
--- a/src/TableFunctions/TableFunctionZeros.cpp
+++ b/src/TableFunctions/TableFunctionZeros.cpp
@@ -20,14 +20,14 @@ extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
 
 
 template <bool multithreaded>
-ColumnsDescription TableFunctionZeros<multithreaded>::getActualTableStructure(const Context & /*context*/) const
+ColumnsDescription TableFunctionZeros<multithreaded>::getActualTableStructure(ContextPtr /*context*/) const
 {
     /// NOTE: https://bugs.llvm.org/show_bug.cgi?id=47418
     return ColumnsDescription{{{"zero", std::make_shared<DataTypeUInt8>()}}};
 }
 
 template <bool multithreaded>
-StoragePtr TableFunctionZeros<multithreaded>::executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
+StoragePtr TableFunctionZeros<multithreaded>::executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/) const
 {
     if (const auto * function = ast_function->as<ASTFunction>())
     {
@@ -53,7 +53,7 @@ void registerTableFunctionZeros(TableFunctionFactory & factory)
 }
 
 template <bool multithreaded>
-UInt64 TableFunctionZeros<multithreaded>::evaluateArgument(const Context & context, ASTPtr & argument) const
+UInt64 TableFunctionZeros<multithreaded>::evaluateArgument(ContextPtr context, ASTPtr & argument) const
 {
     return evaluateConstantExpressionOrIdentifierAsLiteral(argument, context)->as<ASTLiteral &>().value.safeGet<UInt64>();
 }
diff --git a/src/TableFunctions/TableFunctionZeros.h b/src/TableFunctions/TableFunctionZeros.h
index 48a2d8019f6..0407eff2f78 100644
--- a/src/TableFunctions/TableFunctionZeros.h
+++ b/src/TableFunctions/TableFunctionZeros.h
@@ -19,12 +19,12 @@ public:
     std::string getName() const override { return name; }
     bool hasStaticStructure() const override { return true; }
 private:
-    StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name, ColumnsDescription cached_columns) const override;
+    StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns) const override;
     const char * getStorageTypeName() const override { return "SystemZeros"; }
 
-    UInt64 evaluateArgument(const Context & context, ASTPtr & argument) const;
+    UInt64 evaluateArgument(ContextPtr context, ASTPtr & argument) const;
 
-    ColumnsDescription getActualTableStructure(const Context & context) const override;
+    ColumnsDescription getActualTableStructure(ContextPtr context) const override;
 };
 
 
diff --git a/src/TableFunctions/parseColumnsListForTableFunction.cpp b/src/TableFunctions/parseColumnsListForTableFunction.cpp
index 5221d96e086..659aa779ede 100644
--- a/src/TableFunctions/parseColumnsListForTableFunction.cpp
+++ b/src/TableFunctions/parseColumnsListForTableFunction.cpp
@@ -14,10 +14,10 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
 }
 
-ColumnsDescription parseColumnsListFromString(const std::string & structure, const Context & context)
+ColumnsDescription parseColumnsListFromString(const std::string & structure, ContextPtr context)
 {
     ParserColumnDeclarationList parser;
-    const Settings & settings = context.getSettingsRef();
+    const Settings & settings = context->getSettingsRef();
 
     ASTPtr columns_list_raw = parseQuery(parser, structure, "columns declaration list", settings.max_query_size, settings.max_parser_depth);
 
diff --git a/src/TableFunctions/parseColumnsListForTableFunction.h b/src/TableFunctions/parseColumnsListForTableFunction.h
index d077d308e37..e0130a2618d 100644
--- a/src/TableFunctions/parseColumnsListForTableFunction.h
+++ b/src/TableFunctions/parseColumnsListForTableFunction.h
@@ -10,6 +10,6 @@ namespace DB
 class Context;
 
 /// Parses a common argument for table functions such as table structure given in string
-ColumnsDescription parseColumnsListFromString(const std::string & structure, const Context & context);
+ColumnsDescription parseColumnsListFromString(const std::string & structure, ContextPtr context);
 
 }