Merge remote-tracking branch 'ck/master' into use_minmax_index

2024-11-24 00:22:29 +00:00 · 2022-03-30 11:23:24 +08:00 · 2022-03-30 11:23:24 +08:00 · fcfabf4a0c
commit fcfabf4a0c
parent 59727a423e a842a81aba
94 changed files with 2743 additions and 218 deletions
--- a/contrib/llvm-cmake/CMakeLists.txt
+++ b/contrib/llvm-cmake/CMakeLists.txt
@ -1,9 +1,12 @@
-if (APPLE OR NOT ARCH_AMD64 OR SANITIZE STREQUAL "undefined")
+# During cross-compilation in our CI we have to use llvm-tblgen and other building tools
+# tools to be build for host architecture and everything else for target architecture (e.g. AArch64)
+# Possible workaround is to use llvm-tblgen from some package...
+# But lets just enable LLVM for native builds
+if (CMAKE_CROSSCOMPILING OR SANITIZE STREQUAL "undefined")
    set (ENABLE_EMBEDDED_COMPILER_DEFAULT OFF)
 else()
    set (ENABLE_EMBEDDED_COMPILER_DEFAULT ON)
 endif()
-
 option (ENABLE_EMBEDDED_COMPILER "Enable support for 'compile_expressions' option for query execution" ${ENABLE_EMBEDDED_COMPILER_DEFAULT})

 if (NOT ENABLE_EMBEDDED_COMPILER)
--- a/docker/test/performance-comparison/compare.sh
+++ b/docker/test/performance-comparison/compare.sh
@ -1378,7 +1378,7 @@ $REF_SHA	$SHA_TO_TEST	$(numactl --hardware | sed -n 's/^available:[[:space:]]\+/
 EOF

    # Also insert some data about the check into the CI checks table.
-    "${client[@]}" --query "INSERT INTO "'"'"gh-data"'"'".checks FORMAT TSVWithNamesAndTypes" \
+    "${client[@]}" --query "INSERT INTO "'"'"default"'"'".checks FORMAT TSVWithNamesAndTypes" \
        < ci-checks.tsv

    set -x
--- a/docs/zh/engines/table-engines/mergetree-family/versionedcollapsingmergetree.md
+++ b/docs/zh/engines/table-engines/mergetree-family/versionedcollapsingmergetree.md
@ -8,7 +8,7 @@ toc_title: "版本折叠MergeTree"
 这个引擎:

 -   允许快速写入不断变化的对象状态。
-   删除后台中的旧对象状态。 这显着降低了存储体积。
+-   删除后台中的旧对象状态。 这显著降低了存储体积。

 请参阅部分 [崩溃](#table_engines_versionedcollapsingmergetree) 有关详细信息。

--- a/programs/local/LocalServer.cpp
+++ b/programs/local/LocalServer.cpp
@ -184,6 +184,11 @@ void LocalServer::tryInitPath()
    if (path.back() != '/')
        path += '/';

+    fs::create_directories(fs::path(path) / "user_defined/");
+    fs::create_directories(fs::path(path) / "data/");
+    fs::create_directories(fs::path(path) / "metadata/");
+    fs::create_directories(fs::path(path) / "metadata_dropped/");
+
    global_context->setPath(path);

    global_context->setTemporaryStorage(path + "tmp");
@ -565,7 +570,6 @@ void LocalServer::processConfig()
        /// Lock path directory before read
        status.emplace(fs::path(path) / "status", StatusFile::write_full_info);

-        fs::create_directories(fs::path(path) / "user_defined/");
        LOG_DEBUG(log, "Loading user defined objects from {}", path);
        Poco::File(path + "user_defined/").createDirectories();
        UserDefinedSQLObjectsLoader::instance().loadObjects(global_context);
@ -573,9 +577,6 @@ void LocalServer::processConfig()
        LOG_DEBUG(log, "Loaded user defined objects.");

        LOG_DEBUG(log, "Loading metadata from {}", path);
-        fs::create_directories(fs::path(path) / "data/");
-        fs::create_directories(fs::path(path) / "metadata/");
-
        loadMetadataSystem(global_context);
        attachSystemTablesLocal(global_context, *createMemoryDatabaseIfNotExists(global_context, DatabaseCatalog::SYSTEM_DATABASE));
        attachInformationSchema(global_context, *createMemoryDatabaseIfNotExists(global_context, DatabaseCatalog::INFORMATION_SCHEMA));
--- a/programs/server/Server.cpp
+++ b/programs/server/Server.cpp
@ -829,6 +829,36 @@ if (ThreadFuzzer::instance().isEffective())
        fs::create_directories(path / "metadata_dropped/");
    }

+#if USE_ROCKSDB
+    /// Initialize merge tree metadata cache
+    if (config().has("merge_tree_metadata_cache"))
+    {
+        fs::create_directories(path / "rocksdb/");
+        size_t size = config().getUInt64("merge_tree_metadata_cache.lru_cache_size", 256 << 20);
+        bool continue_if_corrupted = config().getBool("merge_tree_metadata_cache.continue_if_corrupted", false);
+        try
+        {
+            LOG_DEBUG(
+                log, "Initiailizing merge tree metadata cache lru_cache_size:{} continue_if_corrupted:{}", size, continue_if_corrupted);
+            global_context->initializeMergeTreeMetadataCache(path_str + "/" + "rocksdb", size);
+        }
+        catch (...)
+        {
+            if (continue_if_corrupted)
+            {
+                /// Rename rocksdb directory and reinitialize merge tree metadata cache
+                time_t now = time(nullptr);
+                fs::rename(path / "rocksdb", path / ("rocksdb.old." + std::to_string(now)));
+                global_context->initializeMergeTreeMetadataCache(path_str + "/" + "rocksdb", size);
+            }
+            else
+            {
+                throw;
+            }
+        }
+    }
+#endif
+
    if (config().has("interserver_http_port") && config().has("interserver_https_port"))
        throw Exception("Both http and https interserver ports are specified", ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG);

--- a/programs/server/config.xml
+++ b/programs/server/config.xml
@ -1294,4 +1294,10 @@
        </tables>
    </rocksdb>
    -->
+
+    <!-- Uncomment if enable merge tree metadata cache -->
+    <merge_tree_metadata_cache>
+        <lru_cache_size>268435456</lru_cache_size>
+        <continue_if_corrupted>true</continue_if_corrupted>
+    </merge_tree_metadata_cache>
 </clickhouse>
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@ -494,6 +494,11 @@ endif()

 target_link_libraries (clickhouse_common_io PUBLIC ch_contrib::fast_float)

+if (USE_ORC)
+    dbms_target_link_libraries(PUBLIC ${ORC_LIBRARIES})
+    dbms_target_include_directories(SYSTEM BEFORE PUBLIC ${ORC_INCLUDE_DIR} "${CMAKE_BINARY_DIR}/contrib/orc/c++/include")
+endif ()
+
 if (TARGET ch_contrib::rocksdb)
    dbms_target_link_libraries(PUBLIC ch_contrib::rocksdb)
 endif()
--- a/src/Common/ProfileEvents.cpp
+++ b/src/Common/ProfileEvents.cpp
@ -285,6 +285,13 @@
    \
    M(MainConfigLoads, "Number of times the main configuration was reloaded.") \
    \
+    M(MergeTreeMetadataCacheGet, "Number of rocksdb reads(used for merge tree metadata cache)") \
+    M(MergeTreeMetadataCachePut, "Number of rocksdb puts(used for merge tree metadata cache)") \
+    M(MergeTreeMetadataCacheDelete, "Number of rocksdb deletes(used for merge tree metadata cache)") \
+    M(MergeTreeMetadataCacheSeek, "Number of rocksdb seeks(used for merge tree metadata cache)") \
+    M(MergeTreeMetadataCacheHit, "Number of times the read of meta file was done from MergeTree metadata cache") \
+    M(MergeTreeMetadataCacheMiss, "Number of times the read of meta file was not done from MergeTree metadata cache") \
+    \
    M(ScalarSubqueriesGlobalCacheHit, "Number of times a read from a scalar subquery was done using the global cache") \
    M(ScalarSubqueriesLocalCacheHit, "Number of times a read from a scalar subquery was done using the local cache") \
    M(ScalarSubqueriesCacheMiss, "Number of times a read from a scalar subquery was not cached and had to be calculated completely")
--- a/src/Common/tests/gtest_global_context.cpp
+++ b/src/Common/tests/gtest_global_context.cpp
@ -1,7 +1,18 @@
 #include "gtest_global_context.h"

 const ContextHolder & getContext()
+{
+    return getMutableContext();
+}
+
+ContextHolder & getMutableContext()
 {
    static ContextHolder holder;
    return holder;
 }
+
+void destroyContext()
+{
+    auto & holder = getMutableContext();
+    return holder.destroy();
+}
--- a/src/Common/tests/gtest_global_context.h
+++ b/src/Common/tests/gtest_global_context.h
@ -16,6 +16,17 @@ struct ContextHolder
    }

    ContextHolder(ContextHolder &&) = default;
+
+    void destroy()
+    {
+        context->shutdown();
+        context.reset();
+        shared_context.reset();
+    }
 };

 const ContextHolder & getContext();
+
+ContextHolder & getMutableContext();
+
+void destroyContext();
--- a/src/Core/SettingsEnums.h
+++ b/src/Core/SettingsEnums.h
@ -187,5 +187,4 @@ DECLARE_SETTING_ENUM_WITH_RENAME(EnumComparingMode, FormatSettings::EnumComparin
 DECLARE_SETTING_ENUM_WITH_RENAME(EscapingRule, FormatSettings::EscapingRule)

 DECLARE_SETTING_ENUM_WITH_RENAME(MsgPackUUIDRepresentation, FormatSettings::MsgPackUUIDRepresentation)
-
 }
--- a/src/Formats/JSONEachRowUtils.cpp
+++ b/src/Formats/JSONEachRowUtils.cpp
@ -9,6 +9,7 @@
 #include <DataTypes/DataTypeArray.h>
 #include <DataTypes/DataTypeTuple.h>
 #include <DataTypes/DataTypeMap.h>
+#include <DataTypes/DataTypeObject.h>
 #include <Common/JSONParsers/SimdJSONParser.h>
 #include <Common/JSONParsers/RapidJSONParser.h>
 #include <Common/JSONParsers/DummyJSONParser.h>
@ -158,22 +159,37 @@ DataTypePtr getDataTypeFromJSONFieldImpl(const Element & field)
    {
        auto object = field.getObject();
        DataTypePtr value_type;
+        bool is_object = false;
        for (const auto key_value_pair : object)
        {
            auto type = getDataTypeFromJSONFieldImpl(key_value_pair.second);
            if (!type)
-                return nullptr;
+                continue;

-            if (value_type && value_type->getName() != type->getName())
-                return nullptr;
-
-            value_type = type;
+            if (isObject(type))
+            {
+                is_object = true;
+                break;
            }

            if (!value_type)
-            return nullptr;
+            {
+                value_type = type;
+            }
+            else if (!value_type->equals(*type))
+            {
+                is_object = true;
+                break;
+            }
+        }

+        if (is_object)
+            return std::make_shared<DataTypeObject>("json", false);
+
+        if (value_type)
            return std::make_shared<DataTypeMap>(std::make_shared<DataTypeString>(), value_type);
+
+        return nullptr;
    }

    throw Exception{ErrorCodes::INCORRECT_DATA, "Unexpected JSON type"};
--- a/src/Formats/ReadSchemaUtils.cpp
+++ b/src/Formats/ReadSchemaUtils.cpp
@ -7,6 +7,8 @@
 #include <Formats/ReadSchemaUtils.h>
 #include <Processors/Formats/ISchemaReader.h>
 #include <Common/assert_cast.h>
+#include <Interpreters/Context.h>
+#include <Storages/IStorage.h>

 namespace DB
 {
@ -17,6 +19,28 @@ namespace ErrorCodes
    extern const int BAD_ARGUMENTS;
 }

+static std::optional<NamesAndTypesList> getOrderedColumnsList(
+    const NamesAndTypesList & columns_list, const Names & columns_order_hint)
+{
+    if (columns_list.size() != columns_order_hint.size())
+        return {};
+
+    std::unordered_map<String, DataTypePtr> available_columns;
+    for (const auto & [name, type] : columns_list)
+        available_columns.emplace(name, type);
+
+    NamesAndTypesList res;
+    for (const auto & name : columns_order_hint)
+    {
+        auto it = available_columns.find(name);
+        if (it == available_columns.end())
+            return {};
+
+        res.emplace_back(name, it->second);
+    }
+    return res;
+}
+
 ColumnsDescription readSchemaFromFormat(
    const String & format_name,
    const std::optional<FormatSettings> & format_settings,
@ -52,6 +76,22 @@ ColumnsDescription readSchemaFromFormat(
        {
            throw Exception(ErrorCodes::CANNOT_EXTRACT_TABLE_STRUCTURE, "Cannot extract table structure from {} format file. Error: {}", format_name, e.message());
        }
+
+        /// If we have "INSERT SELECT" query then try to order
+        /// columns as they are ordered in table schema for formats
+        /// without strict column order (like JSON and TSKV).
+        /// It will allow to execute simple data loading with query
+        /// "INSERT INTO table SELECT * FROM ..."
+        const auto & insertion_table = context->getInsertionTable();
+        if (!schema_reader->hasStrictOrderOfColumns() && !insertion_table.empty())
+        {
+            auto storage = DatabaseCatalog::instance().getTable(insertion_table, context);
+            auto metadata = storage->getInMemoryMetadataPtr();
+            auto names_in_storage = metadata->getColumns().getNamesOfPhysical();
+            auto ordered_list = getOrderedColumnsList(names_and_types, names_in_storage);
+            if (ordered_list)
+                names_and_types = *ordered_list;
+        }
    }
    else
        throw Exception(ErrorCodes::BAD_ARGUMENTS, "{} file format doesn't support schema inference", format_name);
--- a/src/Functions/FunctionsConversion.h
+++ b/src/Functions/FunctionsConversion.h
@ -53,6 +53,7 @@
 #include <DataTypes/DataTypeLowCardinality.h>
 #include <Columns/ColumnLowCardinality.h>
 #include <Interpreters/Context.h>
+#include <Common/HashTable/HashMap.h>


 namespace DB
@ -3140,31 +3141,30 @@ private:
        }
    }

-    WrapperType createObjectWrapper(const DataTypePtr & from_type, const DataTypeObject * to_type) const
+    WrapperType createTupleToObjectWrapper(const DataTypeTuple & from_tuple, bool has_nullable_subcolumns) const
    {
-        if (const auto * from_tuple = checkAndGetDataType<DataTypeTuple>(from_type.get()))
-        {
-            if (!from_tuple->haveExplicitNames())
+        if (!from_tuple.haveExplicitNames())
            throw Exception(ErrorCodes::TYPE_MISMATCH,
-                    "Cast to Object can be performed only from flatten Named Tuple. Got: {}", from_type->getName());
+            "Cast to Object can be performed only from flatten Named Tuple. Got: {}", from_tuple.getName());

        PathsInData paths;
        DataTypes from_types;

-            std::tie(paths, from_types) = flattenTuple(from_type);
+        std::tie(paths, from_types) = flattenTuple(from_tuple.getPtr());
        auto to_types = from_types;

        for (auto & type : to_types)
        {
            if (isTuple(type) || isNested(type))
                throw Exception(ErrorCodes::TYPE_MISMATCH,
-                        "Cast to Object can be performed only from flatten Named Tuple. Got: {}", from_type->getName());
+                    "Cast to Object can be performed only from flatten Named Tuple. Got: {}",
+                    from_tuple.getName());

            type = recursiveRemoveLowCardinality(type);
        }

        return [element_wrappers = getElementWrappers(from_types, to_types),
-                has_nullable_subcolumns = to_type->hasNullableSubcolumns(), from_types, to_types, paths]
+            has_nullable_subcolumns, from_types, to_types, paths]
            (ColumnsWithTypeAndName & arguments, const DataTypePtr &, const ColumnNullable * nullable_source, size_t input_rows_count)
        {
            size_t tuple_size = to_types.size();
@ -3187,6 +3187,93 @@ private:
            return res;
        };
    }
+
+    WrapperType createMapToObjectWrapper(const DataTypeMap & from_map, bool has_nullable_subcolumns) const
+    {
+        auto key_value_types = from_map.getKeyValueTypes();
+
+        if (!isStringOrFixedString(key_value_types[0]))
+            throw Exception(ErrorCodes::TYPE_MISMATCH,
+                "Cast to Object from Map can be performed only from Map "
+                "with String or FixedString key. Got: {}", from_map.getName());
+
+        const auto & value_type = key_value_types[1];
+        auto to_value_type = value_type;
+
+        if (!has_nullable_subcolumns && value_type->isNullable())
+            to_value_type = removeNullable(value_type);
+
+        if (has_nullable_subcolumns && !value_type->isNullable())
+            to_value_type = makeNullable(value_type);
+
+        DataTypes to_key_value_types{std::make_shared<DataTypeString>(), std::move(to_value_type)};
+        auto element_wrappers = getElementWrappers(key_value_types, to_key_value_types);
+
+        return [has_nullable_subcolumns, element_wrappers, key_value_types, to_key_value_types]
+            (ColumnsWithTypeAndName & arguments, const DataTypePtr &, const ColumnNullable * nullable_source, size_t) -> ColumnPtr
+        {
+            const auto & column_map = assert_cast<const ColumnMap &>(*arguments.front().column);
+            const auto & offsets = column_map.getNestedColumn().getOffsets();
+            auto key_value_columns = column_map.getNestedData().getColumnsCopy();
+
+            for (size_t i = 0; i < 2; ++i)
+            {
+                ColumnsWithTypeAndName element{{key_value_columns[i], key_value_types[i], ""}};
+                key_value_columns[i] = element_wrappers[i](element, to_key_value_types[i], nullable_source, key_value_columns[i]->size());
+            }
+
+            const auto & key_column_str = assert_cast<const ColumnString &>(*key_value_columns[0]);
+            const auto & value_column = *key_value_columns[1];
+
+            using SubcolumnsMap = HashMap<StringRef, MutableColumnPtr, StringRefHash>;
+            SubcolumnsMap subcolumns;
+
+            for (size_t row = 0; row < offsets.size(); ++row)
+            {
+                for (size_t i = offsets[static_cast<ssize_t>(row) - 1]; i < offsets[row]; ++i)
+                {
+                    auto ref = key_column_str.getDataAt(i);
+
+                    bool inserted;
+                    SubcolumnsMap::LookupResult it;
+                    subcolumns.emplace(ref, it, inserted);
+                    auto & subcolumn = it->getMapped();
+
+                    if (inserted)
+                        subcolumn = value_column.cloneEmpty()->cloneResized(row);
+
+                    /// Map can have duplicated keys. We insert only first one.
+                    if (subcolumn->size() == row)
+                        subcolumn->insertFrom(value_column, i);
+                }
+
+                /// Insert default values for keys missed in current row.
+                for (const auto & [_, subcolumn] : subcolumns)
+                    if (subcolumn->size() == row)
+                        subcolumn->insertDefault();
+            }
+
+            auto column_object = ColumnObject::create(has_nullable_subcolumns);
+            for (auto && [key, subcolumn] : subcolumns)
+            {
+                PathInData path(key.toView());
+                column_object->addSubcolumn(path, std::move(subcolumn));
+            }
+
+            return column_object;
+        };
+    }
+
+    WrapperType createObjectWrapper(const DataTypePtr & from_type, const DataTypeObject * to_type) const
+    {
+        if (const auto * from_tuple = checkAndGetDataType<DataTypeTuple>(from_type.get()))
+        {
+            return createTupleToObjectWrapper(*from_tuple, to_type->hasNullableSubcolumns());
+        }
+        else if (const auto * from_map = checkAndGetDataType<DataTypeMap>(from_type.get()))
+        {
+            return createMapToObjectWrapper(*from_map, to_type->hasNullableSubcolumns());
+        }
        else if (checkAndGetDataType<DataTypeString>(from_type.get()))
        {
            return [] (ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, const ColumnNullable * nullable_source, size_t input_rows_count)
@ -3199,7 +3286,7 @@ private:
        }

        throw Exception(ErrorCodes::TYPE_MISMATCH,
-            "Cast to Object can be performed only from flatten named tuple or string. Got: {}", from_type->getName());
+            "Cast to Object can be performed only from flatten named Tuple, Map or String. Got: {}", from_type->getName());
    }

    template <typename FieldType>
--- a/src/Functions/flattenTuple.cpp
+++ b/src/Functions/flattenTuple.cpp
@ -0,0 +1,68 @@
+#include <Functions/IFunction.h>
+#include <Functions/FunctionFactory.h>
+#include <Functions/FunctionHelpers.h>
+#include <DataTypes/DataTypeTuple.h>
+#include <DataTypes/ObjectUtils.h>
+#include <Columns/ColumnTuple.h>
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int ILLEGAL_COLUMN;
+    extern const int ILLEGAL_TYPE_OF_ARGUMENT;
+}
+
+namespace
+{
+
+class FunctionFlattenTuple : public IFunction
+{
+public:
+    static constexpr auto name = "flattenTuple";
+    static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionFlattenTuple>(); }
+
+    String getName() const override { return name; }
+    size_t getNumberOfArguments() const override { return 1; }
+    bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo &) const override { return true; }
+    bool useDefaultImplementationForConstants() const override { return true; }
+
+    DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
+    {
+        const auto & type = arguments[0];
+        const auto * type_tuple = checkAndGetDataType<DataTypeTuple>(type.get());
+        if (!type_tuple || !type_tuple->haveExplicitNames())
+            throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
+                "Argument for function '{}' must be Named Tuple. Got '{}'",
+                getName(), type->getName());
+
+        auto [paths, types] = flattenTuple(type);
+        Names names;
+        names.reserve(paths.size());
+        for (const auto & path : paths)
+            names.push_back(path.getPath());
+
+        return std::make_shared<DataTypeTuple>(types, names);
+    }
+
+    ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
+    {
+        auto column = arguments.at(0).column;
+        if (!checkAndGetColumn<ColumnTuple>(column.get()))
+            throw Exception(ErrorCodes::ILLEGAL_COLUMN,
+                "Illegal column {} of first argument of function {}. Expected ColumnTuple",
+                column->getName(), getName());
+
+        return flattenTuple(column);
+    }
+};
+
+}
+
+void registerFunctionFlattenTuple(FunctionFactory & factory)
+{
+    factory.registerFunction<FunctionFlattenTuple>();
+}
+
+}
--- a/src/Functions/registerFunctionsMiscellaneous.cpp
+++ b/src/Functions/registerFunctionsMiscellaneous.cpp
@ -80,6 +80,7 @@ void registerFunctionInitialQueryID(FunctionFactory & factory);
 void registerFunctionServerUUID(FunctionFactory &);
 void registerFunctionZooKeeperSessionUptime(FunctionFactory &);
 void registerFunctionGetOSKernelVersion(FunctionFactory &);
+void registerFunctionFlattenTuple(FunctionFactory &);

 #if USE_ICU
 void registerFunctionConvertCharset(FunctionFactory &);
@ -166,6 +167,7 @@ void registerFunctionsMiscellaneous(FunctionFactory & factory)
    registerFunctionServerUUID(factory);
    registerFunctionZooKeeperSessionUptime(factory);
    registerFunctionGetOSKernelVersion(factory);
+    registerFunctionFlattenTuple(factory);

 #if USE_ICU
    registerFunctionConvertCharset(factory);
--- a/src/IO/ReadBufferFromString.h
+++ b/src/IO/ReadBufferFromString.h
@ -15,4 +15,11 @@ public:

    explicit ReadBufferFromString(std::string_view s) : ReadBufferFromMemory(s.data(), s.size()) {}
 };
+
+class ReadBufferFromOwnString : public String, public ReadBufferFromString
+{
+public:
+    explicit ReadBufferFromOwnString(const String & s_): String(s_), ReadBufferFromString(*this) {}
+};
+
 }
--- a/src/IO/examples/read_buffer.cpp
+++ b/src/IO/examples/read_buffer.cpp
@ -2,18 +2,15 @@

 #include <iostream>

-#include <base/types.h>
-#include <IO/ReadHelpers.h>
+#include <IO/ReadBuffer.h>
 #include <IO/ReadBufferFromString.h>
+#include <IO/ReadHelpers.h>
+#include <base/types.h>

-
-int main(int, char **)
+int readAndPrint(DB::ReadBuffer & in)
 {
    try
    {
-        std::string s = "-123456 123.456 вася пе\\tтя\t'\\'xyz\\\\'";
-        DB::ReadBufferFromString in(s);
-
        DB::Int64 a;
        DB::Float64 b;
        DB::String c, d;
@ -31,12 +28,32 @@ int main(int, char **)

        std::cout << a << ' ' << b << ' ' << c << '\t' << '\'' << d << '\'' << std::endl;
        std::cout << in.count() << std::endl;
+        return 0;
    }
    catch (const DB::Exception & e)
    {
        std::cerr << e.what() << ", " << e.displayText() << std::endl;
        return 1;
    }
+}
+
+int main(int, char **)
+{
+    {
+        std::string s = "-123456 123.456 вася пе\\tтя\t'\\'xyz\\\\'";
+        DB::ReadBufferFromString in(s);
+        if (readAndPrint(in))
+            std::cout << "readAndPrint from ReadBufferFromString failed" << std::endl;
+    }
+
+
+    std::shared_ptr<DB::ReadBufferFromOwnString> in;
+    {
+        std::string s = "-123456 123.456 вася пе\\tтя\t'\\'xyz\\\\'";
+        in = std::make_shared<DB::ReadBufferFromOwnString>(s);
+    }
+    if (readAndPrint(*in))
+        std::cout << "readAndPrint from ReadBufferFromOwnString failed" << std::endl;

    return 0;
 }
--- a/src/Interpreters/AsynchronousMetrics.cpp
+++ b/src/Interpreters/AsynchronousMetrics.cpp
@ -12,6 +12,7 @@
 #include <Storages/MarkCache.h>
 #include <Storages/StorageMergeTree.h>
 #include <Storages/StorageReplicatedMergeTree.h>
+#include <Storages/MergeTree/MergeTreeMetadataCache.h>
 #include <IO/UncompressedCache.h>
 #include <IO/MMappedFileCache.h>
 #include <IO/ReadHelpers.h>
@ -607,6 +608,15 @@ void AsynchronousMetrics::update(std::chrono::system_clock::time_point update_ti
        }
    }

+#if USE_ROCKSDB
+    {
+        if (auto metadata_cache = getContext()->tryGetMergeTreeMetadataCache())
+        {
+            new_values["MergeTreeMetadataCacheSize"] = metadata_cache->getEstimateNumKeys();
+        }
+    }
+#endif
+
 #if USE_EMBEDDED_COMPILER
    {
        if (auto * compiled_expression_cache = CompiledExpressionCacheFactory::instance().tryGetCache())
@ -617,6 +627,7 @@ void AsynchronousMetrics::update(std::chrono::system_clock::time_point update_ti
    }
 #endif

+
    new_values["Uptime"] = getContext()->getUptimeSeconds();

    /// Process process memory usage according to OS
--- a/src/Interpreters/Context.cpp
+++ b/src/Interpreters/Context.cpp
@ -85,11 +85,15 @@
 #include <Storages/MergeTree/BackgroundJobsAssignee.h>
 #include <Storages/MergeTree/MergeTreeBackgroundExecutor.h>
 #include <Storages/MergeTree/MergeTreeDataPartUUID.h>
+#include <Storages/MergeTree/MergeTreeMetadataCache.h>
 #include <Interpreters/SynonymsExtensions.h>
 #include <Interpreters/Lemmatizers.h>
 #include <Interpreters/ClusterDiscovery.h>
 #include <filesystem>

+#if USE_ROCKSDB
+#include <rocksdb/table.h>
+#endif

 namespace fs = std::filesystem;

@ -276,6 +280,11 @@ struct ContextSharedPart

    Context::ConfigReloadCallback config_reload_callback;

+#if USE_ROCKSDB
+    /// Global merge tree metadata cache, stored in rocksdb.
+    MergeTreeMetadataCachePtr merge_tree_metadata_cache;
+#endif
+
    ContextSharedPart()
        : access_control(std::make_unique<AccessControl>())
        , global_overcommit_tracker(&process_list)
@ -410,6 +419,15 @@ struct ContextSharedPart
            trace_collector.reset();
            /// Stop zookeeper connection
            zookeeper.reset();
+
+#if USE_ROCKSDB
+            /// Shutdown merge tree metadata cache
+            if (merge_tree_metadata_cache)
+            {
+                merge_tree_metadata_cache->shutdown();
+                merge_tree_metadata_cache.reset();
+            }
+#endif
        }

        /// Can be removed w/o context lock
@ -2048,6 +2066,23 @@ zkutil::ZooKeeperPtr Context::getAuxiliaryZooKeeper(const String & name) const
    return zookeeper->second;
 }

+#if USE_ROCKSDB
+MergeTreeMetadataCachePtr Context::getMergeTreeMetadataCache() const
+{
+    auto cache = tryGetMergeTreeMetadataCache();
+    if (!cache)
+        throw Exception(
+            ErrorCodes::LOGICAL_ERROR,
+            "Merge tree metadata cache is not initialized, please add config merge_tree_metadata_cache in config.xml and restart");
+    return cache;
+}
+
+MergeTreeMetadataCachePtr Context::tryGetMergeTreeMetadataCache() const
+{
+    return shared->merge_tree_metadata_cache;
+}
+#endif
+
 void Context::resetZooKeeper() const
 {
    std::lock_guard lock(shared->zookeeper_mutex);
@ -2291,6 +2326,13 @@ void Context::initializeTraceCollector()
    shared->initializeTraceCollector(getTraceLog());
 }

+#if USE_ROCKSDB
+void Context::initializeMergeTreeMetadataCache(const String & dir, size_t size)
+{
+    shared->merge_tree_metadata_cache = MergeTreeMetadataCache::create(dir, size);
+}
+#endif
+
 bool Context::hasTraceCollector() const
 {
    return shared->hasTraceCollector();
--- a/src/Interpreters/Context.h
+++ b/src/Interpreters/Context.h
@ -16,6 +16,7 @@
 #include <base/types.h>
 #include <Storages/MergeTree/ParallelReplicasReadingCoordinator.h>

+
 #include "config_core.h"

 #include <boost/container/flat_set.hpp>
@ -152,6 +153,12 @@ using ReadTaskCallback = std::function<String()>;

 using MergeTreeReadTaskCallback = std::function<std::optional<PartitionReadResponse>(PartitionReadRequest)>;

+
+#if USE_ROCKSDB
+class MergeTreeMetadataCache;
+using MergeTreeMetadataCachePtr = std::shared_ptr<MergeTreeMetadataCache>;
+#endif
+
 /// An empty interface for an arbitrary object that may be attached by a shared pointer
 /// to query context, when using ClickHouse as a library.
 struct IHostContext
@ -179,6 +186,7 @@ private:
    std::unique_ptr<ContextSharedPart> shared;
 };

+
 /** A set of known objects that can be used in the query.
  * Consists of a shared part (always common to all sessions and queries)
  *  and copied part (which can be its own for each session or query).
@ -680,6 +688,11 @@ public:

    UInt32 getZooKeeperSessionUptime() const;

+#if USE_ROCKSDB
+    MergeTreeMetadataCachePtr getMergeTreeMetadataCache() const;
+    MergeTreeMetadataCachePtr tryGetMergeTreeMetadataCache() const;
+#endif
+
 #if USE_NURAFT
    std::shared_ptr<KeeperDispatcher> & getKeeperDispatcher() const;
 #endif
@ -769,6 +782,10 @@ public:
    /// Call after initialization before using trace collector.
    void initializeTraceCollector();

+#if USE_ROCKSDB
+    void initializeMergeTreeMetadataCache(const String & dir, size_t size);
+#endif
+
    bool hasTraceCollector() const;

    /// Nullptr if the query log is not ready for this moment.
--- a/src/Interpreters/InterpreterInsertQuery.cpp
+++ b/src/Interpreters/InterpreterInsertQuery.cpp
@ -358,6 +358,7 @@ BlockIO InterpreterInsertQuery::execute()

                auto new_context = Context::createCopy(context);
                new_context->setSettings(new_settings);
+                new_context->setInsertionTable(getContext()->getInsertionTable());

                InterpreterSelectWithUnionQuery interpreter_select{
                    query.select, new_context, SelectQueryOptions(QueryProcessingStage::Complete, 1)};
--- a/src/Interpreters/executeQuery.cpp
+++ b/src/Interpreters/executeQuery.cpp
@ -657,6 +657,14 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                limits.size_limits = SizeLimits(settings.max_result_rows, settings.max_result_bytes, settings.result_overflow_mode);
            }

+            if (const auto * insert_interpreter = typeid_cast<const InterpreterInsertQuery *>(&*interpreter))
+            {
+                /// 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));
+            }
+
            {
                std::unique_ptr<OpenTelemetrySpanHolder> span;
                if (context->query_trace_context.trace_id != UUID())
@ -667,14 +675,6 @@ static std::tuple<ASTPtr, BlockIO> executeQueryImpl(
                }
                res = interpreter->execute();
            }
-
-            if (const auto * insert_interpreter = typeid_cast<const InterpreterInsertQuery *>(&*interpreter))
-            {
-                /// 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));
-            }
        }

        if (process_list_entry)
--- a/src/Processors/Formats/ISchemaReader.h
+++ b/src/Processors/Formats/ISchemaReader.h
@ -18,6 +18,10 @@ public:

    virtual NamesAndTypesList readSchema() = 0;

+    /// True if order of columns is important in format.
+    /// Exceptions: JSON, TSKV.
+    virtual bool hasStrictOrderOfColumns() const { return true; }
+
    virtual ~ISchemaReader() = default;

 protected:
@ -60,6 +64,7 @@ class IRowWithNamesSchemaReader : public ISchemaReader
 public:
    IRowWithNamesSchemaReader(ReadBuffer & in_, size_t max_rows_to_read_, DataTypePtr default_type_ = nullptr);
    NamesAndTypesList readSchema() override;
+    bool hasStrictOrderOfColumns() const override { return false; }

 protected:
    /// Read one row and determine types of columns in it.
--- a/src/Processors/QueryPlan/ReadFromMergeTree.cpp
+++ b/src/Processors/QueryPlan/ReadFromMergeTree.cpp
@ -45,7 +45,8 @@ namespace ErrorCodes
    extern const int LOGICAL_ERROR;
 }

-static MergeTreeReaderSettings getMergeTreeReaderSettings(const ContextPtr & context)
+static MergeTreeReaderSettings getMergeTreeReaderSettings(
+    const ContextPtr & context, const SelectQueryInfo & query_info)
 {
    const auto & settings = context->getSettingsRef();
    return
@ -53,6 +54,7 @@ static MergeTreeReaderSettings getMergeTreeReaderSettings(const ContextPtr & con
        .read_settings = context->getReadSettings(),
        .save_marks_in_cache = true,
        .checksum_on_read = settings.checksum_on_read,
+        .read_in_order = query_info.input_order_info != nullptr,
    };
 }

@ -82,7 +84,7 @@ ReadFromMergeTree::ReadFromMergeTree(
        getPrewhereInfo(query_info_),
        data_.getPartitionValueType(),
        virt_column_names_)})
-    , reader_settings(getMergeTreeReaderSettings(context_))
+    , reader_settings(getMergeTreeReaderSettings(context_, query_info_))
    , prepared_parts(std::move(parts_))
    , real_column_names(std::move(real_column_names_))
    , virt_column_names(std::move(virt_column_names_))
@ -206,6 +208,7 @@ ProcessorPtr ReadFromMergeTree::createSource(
            .colums_to_read = required_columns
        };
    }
+
    return std::make_shared<TSource>(
            data, storage_snapshot, part.data_part, max_block_size, preferred_block_size_bytes,
            preferred_max_column_in_block_size_bytes, required_columns, part.ranges, use_uncompressed_cache, prewhere_info,
@ -921,7 +924,7 @@ MergeTreeDataSelectAnalysisResultPtr ReadFromMergeTree::selectRangesToRead(
            total_marks_pk += part->index_granularity.getMarksCountWithoutFinal();
        parts_before_pk = parts.size();

-        auto reader_settings = getMergeTreeReaderSettings(context);
+        auto reader_settings = getMergeTreeReaderSettings(context, query_info);

        bool use_skip_indexes = settings.use_skip_indexes;
        if (select.final() && !settings.use_skip_indexes_if_final)
--- a/src/Storages/MergeTree/IMergeTreeDataPart.cpp
+++ b/src/Storages/MergeTree/IMergeTreeDataPart.cpp
@ -1,9 +1,11 @@
 #include "IMergeTreeDataPart.h"

 #include <optional>
+#include <boost/algorithm/string/join.hpp>
 #include <string_view>
 #include <Core/Defines.h>
 #include <IO/HashingWriteBuffer.h>
+#include <IO/HashingReadBuffer.h>
 #include <IO/ReadBufferFromString.h>
 #include <IO/ReadHelpers.h>
 #include <IO/WriteHelpers.h>
@ -11,6 +13,8 @@
 #include <Storages/MergeTree/localBackup.h>
 #include <Storages/MergeTree/checkDataPart.h>
 #include <Storages/StorageReplicatedMergeTree.h>
+#include <Storages/MergeTree/PartMetadataManagerOrdinary.h>
+#include <Storages/MergeTree/PartMetadataManagerWithCache.h>
 #include <Common/StringUtils/StringUtils.h>
 #include <Common/escapeForFileName.h>
 #include <Common/ZooKeeper/ZooKeeper.h>
@ -61,13 +65,7 @@ namespace ErrorCodes
    extern const int NOT_IMPLEMENTED;
 }

-static std::unique_ptr<ReadBufferFromFileBase> openForReading(const DiskPtr & disk, const String & path)
-{
-    size_t file_size = disk->getFileSize(path);
-    return disk->readFile(path, ReadSettings().adjustBufferSize(file_size), file_size);
-}
-
-void IMergeTreeDataPart::MinMaxIndex::load(const MergeTreeData & data, const DiskPtr & disk_, const String & part_path)
+void IMergeTreeDataPart::MinMaxIndex::load(const MergeTreeData & data, const PartMetadataManagerPtr & manager)
 {
    auto metadata_snapshot = data.getInMemoryMetadataPtr();
    const auto & partition_key = metadata_snapshot->getPartitionKey();
@ -79,8 +77,8 @@ void IMergeTreeDataPart::MinMaxIndex::load(const MergeTreeData & data, const Dis
    hyperrectangle.reserve(minmax_idx_size);
    for (size_t i = 0; i < minmax_idx_size; ++i)
    {
-        String file_name = fs::path(part_path) / ("minmax_" + escapeForFileName(minmax_column_names[i]) + ".idx");
-        auto file = openForReading(disk_, file_name);
+        String file_name = "minmax_" + escapeForFileName(minmax_column_names[i]) + ".idx";
+        auto file = manager->read(file_name);
        auto serialization = minmax_column_types[i]->getDefaultSerialization();

        Field min_val;
@ -192,6 +190,19 @@ void IMergeTreeDataPart::MinMaxIndex::merge(const MinMaxIndex & other)
    }
 }

+void IMergeTreeDataPart::MinMaxIndex::appendFiles(const MergeTreeData & data, Strings & files)
+{
+    auto metadata_snapshot = data.getInMemoryMetadataPtr();
+    const auto & partition_key = metadata_snapshot->getPartitionKey();
+    auto minmax_column_names = data.getMinMaxColumnsNames(partition_key);
+    size_t minmax_idx_size = minmax_column_names.size();
+    for (size_t i = 0; i < minmax_idx_size; ++i)
+    {
+        String file_name = "minmax_" + escapeForFileName(minmax_column_names[i]) + ".idx";
+        files.push_back(file_name);
+    }
+}
+

 static void incrementStateMetric(IMergeTreeDataPart::State state)
 {
@ -299,6 +310,7 @@ IMergeTreeDataPart::IMergeTreeDataPart(
    , index_granularity_info(storage_, part_type_)
    , part_type(part_type_)
    , parent_part(parent_part_)
+    , use_metadata_cache(storage.use_metadata_cache)
 {
    if (parent_part)
        state = State::Active;
@ -306,6 +318,8 @@ IMergeTreeDataPart::IMergeTreeDataPart(
    incrementTypeMetric(part_type);

    minmax_idx = std::make_shared<MinMaxIndex>();
+
+    initializePartMetadataManager();
 }

 IMergeTreeDataPart::IMergeTreeDataPart(
@ -324,6 +338,7 @@ IMergeTreeDataPart::IMergeTreeDataPart(
    , index_granularity_info(storage_, part_type_)
    , part_type(part_type_)
    , parent_part(parent_part_)
+    , use_metadata_cache(storage.use_metadata_cache)
 {
    if (parent_part)
        state = State::Active;
@ -331,6 +346,8 @@ IMergeTreeDataPart::IMergeTreeDataPart(
    incrementTypeMetric(part_type);

    minmax_idx = std::make_shared<MinMaxIndex>();
+
+    initializePartMetadataManager();
 }

 IMergeTreeDataPart::~IMergeTreeDataPart()
@ -558,9 +575,10 @@ size_t IMergeTreeDataPart::getFileSizeOrZero(const String & file_name) const
    return checksum->second.file_size;
 }

-String IMergeTreeDataPart::getColumnNameWithMinimumCompressedSize(const StorageMetadataPtr & metadata_snapshot) const
+String IMergeTreeDataPart::getColumnNameWithMinimumCompressedSize(const StorageSnapshotPtr & storage_snapshot) const
 {
-    const auto & storage_columns = metadata_snapshot->getColumns().getAllPhysical();
+    auto options = GetColumnsOptions(GetColumnsOptions::AllPhysical).withExtendedObjects().withSubcolumns();
+    auto storage_columns = storage_snapshot->getColumns(options);
    MergeTreeData::AlterConversions alter_conversions;
    if (!parent_part)
        alter_conversions = storage.getAlterConversionsForPart(shared_from_this());
@ -637,6 +655,33 @@ void IMergeTreeDataPart::loadColumnsChecksumsIndexes(bool require_columns_checks
    loadDefaultCompressionCodec();
 }

+void IMergeTreeDataPart::appendFilesOfColumnsChecksumsIndexes(Strings & files, bool include_projection) const
+{
+    if (isStoredOnDisk())
+    {
+        appendFilesOfUUID(files);
+        appendFilesOfColumns(files);
+        appendFilesOfChecksums(files);
+        appendFilesOfIndexGranularity(files);
+        appendFilesOfIndex(files);
+        appendFilesOfRowsCount(files);
+        appendFilesOfPartitionAndMinMaxIndex(files);
+        appendFilesOfTTLInfos(files);
+        appendFilesOfDefaultCompressionCodec(files);
+    }
+
+    if (!parent_part && include_projection)
+    {
+        for (const auto & [projection_name, projection_part] : projection_parts)
+        {
+            Strings projection_files;
+            projection_part->appendFilesOfColumnsChecksumsIndexes(projection_files, true);
+            for (const auto & projection_file : projection_files)
+                files.push_back(fs::path(projection_part->relative_path) / projection_file);
+        }
+    }
+}
+
 void IMergeTreeDataPart::loadProjections(bool require_columns_checksums, bool check_consistency)
 {
    auto metadata_snapshot = storage.getInMemoryMetadataPtr();
@ -657,6 +702,11 @@ void IMergeTreeDataPart::loadIndexGranularity()
    throw Exception("Method 'loadIndexGranularity' is not implemented for part with type " + getType().toString(), ErrorCodes::NOT_IMPLEMENTED);
 }

+/// Currently we don't cache mark files of part, because cache other meta files is enough to speed up loading.
+void IMergeTreeDataPart::appendFilesOfIndexGranularity(Strings & /* files */) const
+{
+}
+
 void IMergeTreeDataPart::loadIndex()
 {
    /// It can be empty in case of mutations
@ -680,9 +730,9 @@ void IMergeTreeDataPart::loadIndex()
            loaded_index[i]->reserve(index_granularity.getMarksCount());
        }

-        String index_path = fs::path(getFullRelativePath()) / "primary.idx";
-        auto index_file = openForReading(volume->getDisk(), index_path);
-
+        String index_name = "primary.idx";
+        String index_path = fs::path(getFullRelativePath()) / index_name;
+        auto index_file = metadata_manager->read(index_name);
        size_t marks_count = index_granularity.getMarksCount();

        Serializations key_serializations(key_size);
@ -709,6 +759,19 @@ void IMergeTreeDataPart::loadIndex()
    }
 }

+void IMergeTreeDataPart::appendFilesOfIndex(Strings & files) const
+{
+    auto metadata_snapshot = storage.getInMemoryMetadataPtr();
+    if (parent_part)
+        metadata_snapshot = metadata_snapshot->projections.has(name) ? metadata_snapshot->projections.get(name).metadata : nullptr;
+
+    if (!metadata_snapshot)
+        return;
+
+    if (metadata_snapshot->hasPrimaryKey())
+        files.push_back("primary.idx");
+}
+
 NameSet IMergeTreeDataPart::getFileNamesWithoutChecksums() const
 {
    if (!isStoredOnDisk())
@ -733,14 +796,14 @@ void IMergeTreeDataPart::loadDefaultCompressionCodec()
    }

    String path = fs::path(getFullRelativePath()) / DEFAULT_COMPRESSION_CODEC_FILE_NAME;
-    if (!volume->getDisk()->exists(path))
+    bool exists = metadata_manager->exists(DEFAULT_COMPRESSION_CODEC_FILE_NAME);
+    if (!exists)
    {
        default_codec = detectDefaultCompressionCodec();
    }
    else
    {
-
-        auto file_buf = openForReading(volume->getDisk(), path);
+        auto file_buf = metadata_manager->read(DEFAULT_COMPRESSION_CODEC_FILE_NAME);
        String codec_line;
        readEscapedStringUntilEOL(codec_line, *file_buf);

@ -748,7 +811,13 @@ void IMergeTreeDataPart::loadDefaultCompressionCodec()

        if (!checkString("CODEC", buf))
        {
-            LOG_WARNING(storage.log, "Cannot parse default codec for part {} from file {}, content '{}'. Default compression codec will be deduced automatically, from data on disk", name, path, codec_line);
+            LOG_WARNING(
+                storage.log,
+                "Cannot parse default codec for part {} from file {}, content '{}'. Default compression codec will be deduced "
+                "automatically, from data on disk",
+                name,
+                path,
+                codec_line);
            default_codec = detectDefaultCompressionCodec();
        }

@ -766,6 +835,11 @@ void IMergeTreeDataPart::loadDefaultCompressionCodec()
    }
 }

+void IMergeTreeDataPart::appendFilesOfDefaultCompressionCodec(Strings & files)
+{
+    files.push_back(DEFAULT_COMPRESSION_CODEC_FILE_NAME);
+}
+
 CompressionCodecPtr IMergeTreeDataPart::detectDefaultCompressionCodec() const
 {
    /// In memory parts doesn't have any compression
@ -828,7 +902,7 @@ void IMergeTreeDataPart::loadPartitionAndMinMaxIndex()
    {
        String path = getFullRelativePath();
        if (!parent_part)
-            partition.load(storage, volume->getDisk(), path);
+            partition.load(storage, metadata_manager);

        if (!isEmpty())
        {
@ -836,7 +910,7 @@ void IMergeTreeDataPart::loadPartitionAndMinMaxIndex()
                // projection parts don't have minmax_idx, and it's always initialized
                minmax_idx->initialized = true;
            else
-                minmax_idx->load(storage, volume->getDisk(), path);
+                minmax_idx->load(storage, metadata_manager);
        }
        if (parent_part)
            return;
@ -851,13 +925,26 @@ void IMergeTreeDataPart::loadPartitionAndMinMaxIndex()
            ErrorCodes::CORRUPTED_DATA);
 }

+void IMergeTreeDataPart::appendFilesOfPartitionAndMinMaxIndex(Strings & files) const
+{
+    if (storage.format_version < MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING && !parent_part)
+        return;
+
+    if (!parent_part)
+        partition.appendFiles(storage, files);
+
+    if (!isEmpty())
+        if (!parent_part)
+            minmax_idx->appendFiles(storage, files);
+}
+
 void IMergeTreeDataPart::loadChecksums(bool require)
 {
    const String path = fs::path(getFullRelativePath()) / "checksums.txt";
-
-    if (volume->getDisk()->exists(path))
+    bool exists = metadata_manager->exists("checksums.txt");
+    if (exists)
    {
-        auto buf = openForReading(volume->getDisk(), path);
+        auto buf = metadata_manager->read("checksums.txt");
        if (checksums.read(*buf))
        {
            assertEOF(*buf);
@ -888,13 +975,18 @@ void IMergeTreeDataPart::loadChecksums(bool require)
    }
 }

+void IMergeTreeDataPart::appendFilesOfChecksums(Strings & files)
+{
+    files.push_back("checksums.txt");
+}
+
 void IMergeTreeDataPart::loadRowsCount()
 {
    String path = fs::path(getFullRelativePath()) / "count.txt";

    auto read_rows_count = [&]()
    {
-        auto buf = openForReading(volume->getDisk(), path);
+        auto buf = metadata_manager->read("count.txt");
        readIntText(rows_count, *buf);
        assertEOF(*buf);
    };
@ -905,7 +997,8 @@ void IMergeTreeDataPart::loadRowsCount()
    }
    else if (storage.format_version >= MERGE_TREE_DATA_MIN_FORMAT_VERSION_WITH_CUSTOM_PARTITIONING || part_type == Type::COMPACT || parent_part)
    {
-        if (!volume->getDisk()->exists(path))
+        bool exists = metadata_manager->exists("count.txt");
+        if (!exists)
            throw Exception("No count.txt in part " + name, ErrorCodes::NO_FILE_IN_DATA_PART);

        read_rows_count();
@ -1003,12 +1096,17 @@ void IMergeTreeDataPart::loadRowsCount()
    }
 }

+void IMergeTreeDataPart::appendFilesOfRowsCount(Strings & files)
+{
+    files.push_back("count.txt");
+}
+
 void IMergeTreeDataPart::loadTTLInfos()
 {
-    String path = fs::path(getFullRelativePath()) / "ttl.txt";
-    if (volume->getDisk()->exists(path))
+    bool exists = metadata_manager->exists("ttl.txt");
+    if (exists)
    {
-        auto in = openForReading(volume->getDisk(), path);
+        auto in = metadata_manager->read("ttl.txt");
        assertString("ttl format version: ", *in);
        size_t format_version;
        readText(format_version, *in);
@ -1030,19 +1128,29 @@ void IMergeTreeDataPart::loadTTLInfos()
    }
 }

+
+void IMergeTreeDataPart::appendFilesOfTTLInfos(Strings & files)
+{
+    files.push_back("ttl.txt");
+}
+
 void IMergeTreeDataPart::loadUUID()
 {
-    String path = fs::path(getFullRelativePath()) / UUID_FILE_NAME;
-
-    if (volume->getDisk()->exists(path))
+    bool exists = metadata_manager->exists(UUID_FILE_NAME);
+    if (exists)
    {
-        auto in = openForReading(volume->getDisk(), path);
+        auto in = metadata_manager->read(UUID_FILE_NAME);
        readText(uuid, *in);
        if (uuid == UUIDHelpers::Nil)
            throw Exception("Unexpected empty " + String(UUID_FILE_NAME) + " in part: " + name, ErrorCodes::LOGICAL_ERROR);
    }
 }

+void IMergeTreeDataPart::appendFilesOfUUID(Strings & files)
+{
+    files.push_back(UUID_FILE_NAME);
+}
+
 void IMergeTreeDataPart::loadColumns(bool require)
 {
    String path = fs::path(getFullRelativePath()) / "columns.txt";
@ -1051,7 +1159,8 @@ void IMergeTreeDataPart::loadColumns(bool require)
        metadata_snapshot = metadata_snapshot->projections.get(name).metadata;
    NamesAndTypesList loaded_columns;

-    if (!volume->getDisk()->exists(path))
+    bool exists = metadata_manager->exists("columns.txt");
+    if (!exists)
    {
        /// We can get list of columns only from columns.txt in compact parts.
        if (require || part_type == Type::COMPACT)
@ -1074,7 +1183,8 @@ void IMergeTreeDataPart::loadColumns(bool require)
    }
    else
    {
-        loaded_columns.readText(*volume->getDisk()->readFile(path));
+        auto in = metadata_manager->read("columns.txt");
+        loaded_columns.readText(*in);

        for (const auto & column : loaded_columns)
        {
@ -1091,14 +1201,23 @@ void IMergeTreeDataPart::loadColumns(bool require)
    };

    SerializationInfoByName infos(loaded_columns, settings);
-    path = getFullRelativePath() + SERIALIZATION_FILE_NAME;
-    if (volume->getDisk()->exists(path))
-        infos.readJSON(*volume->getDisk()->readFile(path));
+    exists =  metadata_manager->exists(SERIALIZATION_FILE_NAME);
+    if (exists)
+    {
+        auto in = metadata_manager->read(SERIALIZATION_FILE_NAME);
+        infos.readJSON(*in);
+    }

    setColumns(loaded_columns);
    setSerializationInfos(infos);
 }

+void IMergeTreeDataPart::appendFilesOfColumns(Strings & files)
+{
+    files.push_back("columns.txt");
+    files.push_back(SERIALIZATION_FILE_NAME);
+}
+
 bool IMergeTreeDataPart::shallParticipateInMerges(const StoragePolicyPtr & storage_policy) const
 {
    /// `IMergeTreeDataPart::volume` describes space where current part belongs, and holds
@ -1150,9 +1269,12 @@ try
        }
    }

+    metadata_manager->deleteAll(true);
+    metadata_manager->assertAllDeleted(true);
    volume->getDisk()->setLastModified(from, Poco::Timestamp::fromEpochTime(time(nullptr)));
    volume->getDisk()->moveDirectory(from, to);
    relative_path = new_relative_path;
+    metadata_manager->updateAll(true);

    SyncGuardPtr sync_guard;
    if (storage.getSettings()->fsync_part_directory)
@ -1190,6 +1312,18 @@ std::optional<bool> IMergeTreeDataPart::keepSharedDataInDecoupledStorage() const
    return !storage.unlockSharedData(*this);
 }

+void IMergeTreeDataPart::initializePartMetadataManager()
+{
+#if USE_ROCKSDB
+    if (use_metadata_cache)
+        metadata_manager = std::make_shared<PartMetadataManagerWithCache>(this, storage.getContext()->getMergeTreeMetadataCache());
+    else
+        metadata_manager = std::make_shared<PartMetadataManagerOrdinary>(this);
+#else
+        metadata_manager = std::make_shared<PartMetadataManagerOrdinary>(this);
+#endif
+}
+
 void IMergeTreeDataPart::remove() const
 {
    std::optional<bool> keep_shared_data = keepSharedDataInDecoupledStorage();
@ -1209,6 +1343,9 @@ void IMergeTreeDataPart::remove() const
        return;
    }

+    metadata_manager->deleteAll(false);
+    metadata_manager->assertAllDeleted(false);
+
    /** Atomic directory removal:
      * - rename directory to temporary name;
      * - remove it recursive.
@ -1314,6 +1451,9 @@ void IMergeTreeDataPart::remove() const

 void IMergeTreeDataPart::projectionRemove(const String & parent_to, bool keep_shared_data) const
 {
+    metadata_manager->deleteAll(false);
+    metadata_manager->assertAllDeleted(false);
+
    String to = fs::path(parent_to) / relative_path;
    auto disk = volume->getDisk();
    if (checksums.empty())
@ -1661,6 +1801,35 @@ String IMergeTreeDataPart::getZeroLevelPartBlockID(std::string_view token) const
    return info.partition_id + "_" + toString(hash_value.words[0]) + "_" + toString(hash_value.words[1]);
 }

+IMergeTreeDataPart::uint128 IMergeTreeDataPart::getActualChecksumByFile(const String & file_path) const
+{
+    assert(use_metadata_cache);
+
+    String file_name = std::filesystem::path(file_path).filename();
+    const auto filenames_without_checksums = getFileNamesWithoutChecksums();
+    auto it = checksums.files.find(file_name);
+    if (filenames_without_checksums.count(file_name) == 0 && it != checksums.files.end())
+    {
+        return it->second.file_hash;
+    }
+
+    if (!volume->getDisk()->exists(file_path))
+    {
+        return {};
+    }
+    std::unique_ptr<ReadBufferFromFileBase> in_file = volume->getDisk()->readFile(file_path);
+    HashingReadBuffer in_hash(*in_file);
+
+    String value;
+    readStringUntilEOF(value, in_hash);
+    return in_hash.getHash();
+}
+
+std::unordered_map<String, IMergeTreeDataPart::uint128> IMergeTreeDataPart::checkMetadata() const
+{
+    return metadata_manager->check();
+}
+
 bool isCompactPart(const MergeTreeDataPartPtr & data_part)
 {
    return (data_part && data_part->getType() == MergeTreeDataPartType::COMPACT);
--- a/src/Storages/MergeTree/IMergeTreeDataPart.h
+++ b/src/Storages/MergeTree/IMergeTreeDataPart.h
@ -14,6 +14,7 @@
 #include <Storages/MergeTree/MergeTreeIOSettings.h>
 #include <Storages/MergeTree/KeyCondition.h>
 #include <DataTypes/Serializations/SerializationInfo.h>
+#include <Storages/MergeTree/IPartMetadataManager.h>

 #include <shared_mutex>

@ -60,6 +61,8 @@ public:

    using Type = MergeTreeDataPartType;

+    using uint128 = IPartMetadataManager::uint128;
+

    IMergeTreeDataPart(
        const MergeTreeData & storage_,
@ -148,6 +151,7 @@ public:
    /// Initialize columns (from columns.txt if exists, or create from column files if not).
    /// Load checksums from checksums.txt if exists. Load index if required.
    void loadColumnsChecksumsIndexes(bool require_columns_checksums, bool check_consistency);
+    void appendFilesOfColumnsChecksumsIndexes(Strings & files, bool include_projection = false) const;

    String getMarksFileExtension() const { return index_granularity_info.marks_file_extension; }

@ -164,7 +168,7 @@ public:

    /// Returns the name of a column with minimum compressed size (as returned by getColumnSize()).
    /// If no checksums are present returns the name of the first physically existing column.
-    String getColumnNameWithMinimumCompressedSize(const StorageMetadataPtr & metadata_snapshot) const;
+    String getColumnNameWithMinimumCompressedSize(const StorageSnapshotPtr & storage_snapshot) const;

    bool contains(const IMergeTreeDataPart & other) const { return info.contains(other.info); }

@ -243,7 +247,7 @@ public:
    using TTLInfo = MergeTreeDataPartTTLInfo;
    using TTLInfos = MergeTreeDataPartTTLInfos;

-    TTLInfos ttl_infos;
+    mutable TTLInfos ttl_infos;

    /// Current state of the part. If the part is in working set already, it should be accessed via data_parts mutex
    void setState(State new_state) const;
@ -300,14 +304,16 @@ public:
        {
        }

+        void load(const MergeTreeData & data, const PartMetadataManagerPtr & manager);
+
        using WrittenFiles = std::vector<std::unique_ptr<WriteBufferFromFileBase>>;

-        void load(const MergeTreeData & data, const DiskPtr & disk_, const String & part_path);
        [[nodiscard]] WrittenFiles store(const MergeTreeData & data, const DiskPtr & disk_, const String & part_path, Checksums & checksums) const;
        [[nodiscard]] WrittenFiles store(const Names & column_names, const DataTypes & data_types, const DiskPtr & disk_, const String & part_path, Checksums & checksums) const;

        void update(const Block & block, const Names & column_names);
        void merge(const MinMaxIndex & other);
+        static void appendFiles(const MergeTreeData & data, Strings & files);
    };

    using MinMaxIndexPtr = std::shared_ptr<MinMaxIndex>;
@ -429,6 +435,12 @@ public:
    /// Required for distinguish different copies of the same part on remote FS.
    String getUniqueId() const;

+    /// Get checksums of metadata file in part directory
+    IMergeTreeDataPart::uint128 getActualChecksumByFile(const String & file_path) const;
+
+    /// Check metadata in cache is consistent with actual metadata on disk(if use_metadata_cache is true)
+    std::unordered_map<String, uint128> checkMetadata() const;
+
 protected:

    /// Total size of all columns, calculated once in calcuateColumnSizesOnDisk
@ -455,6 +467,11 @@ protected:

    std::map<String, std::shared_ptr<IMergeTreeDataPart>> projection_parts;

+    /// Disabled when USE_ROCKSDB is OFF or use_metadata_cache is set to false in merge tree settings
+    bool use_metadata_cache = false;
+
+    mutable PartMetadataManagerPtr metadata_manager;
+
    void removeIfNeeded();

    virtual void checkConsistency(bool require_part_metadata) const;
@ -468,6 +485,9 @@ protected:

    std::optional<bool> keepSharedDataInDecoupledStorage() const;

+    void initializePartMetadataManager();
+
+
 private:
    /// In compact parts order of columns is necessary
    NameToNumber column_name_to_position;
@ -478,36 +498,54 @@ private:
    /// Reads part unique identifier (if exists) from uuid.txt
    void loadUUID();

+    static void appendFilesOfUUID(Strings & files);
+
    /// Reads columns names and types from columns.txt
    void loadColumns(bool require);

+    static void appendFilesOfColumns(Strings & files);
+
    /// If checksums.txt exists, reads file's checksums (and sizes) from it
    void loadChecksums(bool require);

+    static void appendFilesOfChecksums(Strings & files);
+
    /// Loads marks index granularity into memory
    virtual void loadIndexGranularity();

+    virtual void appendFilesOfIndexGranularity(Strings & files) const;
+
    /// Loads index file.
    void loadIndex();

+    void appendFilesOfIndex(Strings & files) const;
+
    /// Load rows count for this part from disk (for the newer storage format version).
    /// For the older format version calculates rows count from the size of a column with a fixed size.
    void loadRowsCount();

+    static void appendFilesOfRowsCount(Strings & files);
+
    /// Loads ttl infos in json format from file ttl.txt. If file doesn't exists assigns ttl infos with all zeros
    void loadTTLInfos();

+    static void appendFilesOfTTLInfos(Strings & files);
+
    void loadPartitionAndMinMaxIndex();

    void calculateColumnsSizesOnDisk();

    void calculateSecondaryIndicesSizesOnDisk();

+    void appendFilesOfPartitionAndMinMaxIndex(Strings & files) const;
+
    /// Load default compression codec from file default_compression_codec.txt
    /// if it not exists tries to deduce codec from compressed column without
    /// any specifial compression.
    void loadDefaultCompressionCodec();

+    static void appendFilesOfDefaultCompressionCodec(Strings & files);
+
    /// Found column without specific compression and return codec
    /// for this column with default parameters.
    CompressionCodecPtr detectDefaultCompressionCodec() const;
--- a/src/Storages/MergeTree/IPartMetadataManager.cpp
+++ b/src/Storages/MergeTree/IPartMetadataManager.cpp
@ -0,0 +1,11 @@
+#include "IPartMetadataManager.h"
+
+#include <Disks/IVolume.h>
+#include <Storages/MergeTree/IMergeTreeDataPart.h>
+
+namespace DB
+{
+IPartMetadataManager::IPartMetadataManager(const IMergeTreeDataPart * part_) : part(part_), disk(part->volume->getDisk())
+{
+}
+}
--- a/src/Storages/MergeTree/IPartMetadataManager.h
+++ b/src/Storages/MergeTree/IPartMetadataManager.h
@ -0,0 +1,59 @@
+#pragma once
+
+#include <unordered_map>
+#include <city.h>
+#include <base/types.h>
+
+namespace DB
+{
+
+class IMergeTreeDataPart;
+
+class SeekableReadBuffer;
+
+class IDisk;
+using DiskPtr = std::shared_ptr<IDisk>;
+
+/// Interface for managing metadata of merge tree part.
+/// IPartMetadataManager has two implementations:
+/// - PartMetadataManagerOrdinary: manage metadata from disk directly. deleteAll/assertAllDeleted/updateAll/check
+///   are all empty implementations because they are not needed for PartMetadataManagerOrdinary(those operations
+///   are done implicitly when removing or renaming part directory).
+/// - PartMetadataManagerWithCache: manage metadata from RocksDB cache and disk.
+class IPartMetadataManager
+{
+public:
+    using uint128 = CityHash_v1_0_2::uint128;
+
+    explicit IPartMetadataManager(const IMergeTreeDataPart * part_);
+
+    virtual ~IPartMetadataManager() = default;
+
+    /// Read metadata content and return SeekableReadBuffer object.
+    virtual std::unique_ptr<SeekableReadBuffer> read(const String & file_name) const = 0;
+
+    /// Return true if metadata exists in part.
+    virtual bool exists(const String & file_name) const = 0;
+
+    /// Delete all metadatas in part.
+    /// If include_projection is true, also delete metadatas in projection parts.
+    virtual void deleteAll(bool include_projection) = 0;
+
+    /// Assert that all metadatas in part are deleted.
+    /// If include_projection is true, also assert that all metadatas in projection parts are deleted.
+    virtual void assertAllDeleted(bool include_projection) const = 0;
+
+    /// Update all metadatas in part.
+    /// If include_projection is true, also update metadatas in projection parts.
+    virtual void updateAll(bool include_projection) = 0;
+
+    /// Check all metadatas in part.
+    virtual std::unordered_map<String, uint128> check() const = 0;
+
+protected:
+    const IMergeTreeDataPart * part;
+    const DiskPtr disk;
+};
+
+using PartMetadataManagerPtr = std::shared_ptr<IPartMetadataManager>;
+}
--- a/src/Storages/MergeTree/KeyCondition.cpp
+++ b/src/Storages/MergeTree/KeyCondition.cpp
@ -53,7 +53,7 @@ String Range::toString() const


 /// Example: for `Hello\_World% ...` string it returns `Hello_World`, and for `%test%` returns an empty string.
-static String extractFixedPrefixFromLikePattern(const String & like_pattern)
+String extractFixedPrefixFromLikePattern(const String & like_pattern)
 {
    String fixed_prefix;

--- a/src/Storages/MergeTree/KeyCondition.h
+++ b/src/Storages/MergeTree/KeyCondition.h
@ -442,4 +442,6 @@ private:
    bool strict;
 };

+String extractFixedPrefixFromLikePattern(const String & like_pattern);
+
 }
--- a/src/Storages/MergeTree/MergeTreeBlockReadUtils.cpp
+++ b/src/Storages/MergeTree/MergeTreeBlockReadUtils.cpp
@ -24,7 +24,7 @@ namespace
 /// least one existing (physical) column in part.
 bool injectRequiredColumnsRecursively(
    const String & column_name,
-    const ColumnsDescription & storage_columns,
+    const StorageSnapshotPtr & storage_snapshot,
    const MergeTreeData::AlterConversions & alter_conversions,
    const MergeTreeData::DataPartPtr & part,
    Names & columns,
@ -36,7 +36,8 @@ bool injectRequiredColumnsRecursively(
    /// stages.
    checkStackSize();

-    auto column_in_storage = storage_columns.tryGetColumnOrSubcolumn(GetColumnsOptions::AllPhysical, column_name);
+    auto options = GetColumnsOptions(GetColumnsOptions::AllPhysical).withSubcolumns().withExtendedObjects();
+    auto column_in_storage = storage_snapshot->tryGetColumn(options, column_name);
    if (column_in_storage)
    {
        auto column_name_in_part = column_in_storage->getNameInStorage();
@ -63,7 +64,8 @@ bool injectRequiredColumnsRecursively(

    /// Column doesn't have default value and don't exist in part
    /// don't need to add to required set.
-    const auto column_default = storage_columns.getDefault(column_name);
+    auto metadata_snapshot = storage_snapshot->getMetadataForQuery();
+    const auto column_default = metadata_snapshot->getColumns().getDefault(column_name);
    if (!column_default)
        return false;

@ -73,39 +75,36 @@ bool injectRequiredColumnsRecursively(

    bool result = false;
    for (const auto & identifier : identifiers)
-        result |= injectRequiredColumnsRecursively(identifier, storage_columns, alter_conversions, part, columns, required_columns, injected_columns);
+        result |= injectRequiredColumnsRecursively(identifier, storage_snapshot, alter_conversions, part, columns, required_columns, injected_columns);

    return result;
 }

 }

-NameSet injectRequiredColumns(const MergeTreeData & storage, const StorageMetadataPtr & metadata_snapshot, const MergeTreeData::DataPartPtr & part, Names & columns)
+NameSet injectRequiredColumns(
+    const MergeTreeData & storage,
+    const StorageSnapshotPtr & storage_snapshot,
+    const MergeTreeData::DataPartPtr & part,
+    Names & columns)
 {
    NameSet required_columns{std::begin(columns), std::end(columns)};
    NameSet injected_columns;

    bool have_at_least_one_physical_column = false;
-
-    const auto & storage_columns = metadata_snapshot->getColumns();
    MergeTreeData::AlterConversions alter_conversions;
    if (!part->isProjectionPart())
        alter_conversions = storage.getAlterConversionsForPart(part);
+
    for (size_t i = 0; i < columns.size(); ++i)
    {
-        auto name_in_storage = Nested::extractTableName(columns[i]);
-        if (storage_columns.has(name_in_storage) && isObject(storage_columns.get(name_in_storage).type))
-        {
-            have_at_least_one_physical_column = true;
-            continue;
-        }
-
        /// We are going to fetch only physical columns
-        if (!storage_columns.hasColumnOrSubcolumn(GetColumnsOptions::AllPhysical, columns[i]))
-            throw Exception("There is no physical column or subcolumn " + columns[i] + " in table.", ErrorCodes::NO_SUCH_COLUMN_IN_TABLE);
+        auto options = GetColumnsOptions(GetColumnsOptions::AllPhysical).withSubcolumns().withExtendedObjects();
+        if (!storage_snapshot->tryGetColumn(options, columns[i]))
+            throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "There is no physical column or subcolumn {} in table", columns[i]);

        have_at_least_one_physical_column |= injectRequiredColumnsRecursively(
-            columns[i], storage_columns, alter_conversions,
+            columns[i], storage_snapshot, alter_conversions,
            part, columns, required_columns, injected_columns);
    }

@ -115,7 +114,7 @@ NameSet injectRequiredColumns(const MergeTreeData & storage, const StorageMetada
        */
    if (!have_at_least_one_physical_column)
    {
-        const auto minimum_size_column_name = part->getColumnNameWithMinimumCompressedSize(metadata_snapshot);
+        const auto minimum_size_column_name = part->getColumnNameWithMinimumCompressedSize(storage_snapshot);
        columns.push_back(minimum_size_column_name);
        /// correctly report added column
        injected_columns.insert(columns.back());
@ -271,7 +270,7 @@ MergeTreeReadTaskColumns getReadTaskColumns(
    Names pre_column_names;

    /// inject columns required for defaults evaluation
-    bool should_reorder = !injectRequiredColumns(storage, storage_snapshot->getMetadataForQuery(), data_part, column_names).empty();
+    bool should_reorder = !injectRequiredColumns(storage, storage_snapshot, data_part, column_names).empty();

    if (prewhere_info)
    {
@ -296,7 +295,7 @@ MergeTreeReadTaskColumns getReadTaskColumns(
        if (pre_column_names.empty())
            pre_column_names.push_back(column_names[0]);

-        const auto injected_pre_columns = injectRequiredColumns(storage, storage_snapshot->getMetadataForQuery(), data_part, pre_column_names);
+        const auto injected_pre_columns = injectRequiredColumns(storage, storage_snapshot, data_part, pre_column_names);
        if (!injected_pre_columns.empty())
            should_reorder = true;

--- a/src/Storages/MergeTree/MergeTreeBlockReadUtils.h
+++ b/src/Storages/MergeTree/MergeTreeBlockReadUtils.h
@ -22,7 +22,7 @@ using MergeTreeBlockSizePredictorPtr = std::shared_ptr<MergeTreeBlockSizePredict
  * so that you can calculate the DEFAULT expression for these columns.
  * Adds them to the `columns`.
  */
-NameSet injectRequiredColumns(const MergeTreeData & storage, const StorageMetadataPtr & metadata_snapshot, const MergeTreeData::DataPartPtr & part, Names & columns);
+NameSet injectRequiredColumns(const MergeTreeData & storage, const StorageSnapshotPtr & storage_snapshot, const MergeTreeData::DataPartPtr & part, Names & columns);


 /// A batch of work for MergeTreeThreadSelectBlockInputStream
--- a/src/Storages/MergeTree/MergeTreeData.cpp
+++ b/src/Storages/MergeTree/MergeTreeData.cpp
@ -214,6 +214,7 @@ MergeTreeData::MergeTreeData(
    , parts_mover(this)
    , background_operations_assignee(*this, BackgroundJobsAssignee::Type::DataProcessing, getContext())
    , background_moves_assignee(*this, BackgroundJobsAssignee::Type::Moving, getContext())
+    , use_metadata_cache(getSettings()->use_metadata_cache)
 {
    context_->getGlobalContext()->initializeBackgroundExecutorsIfNeeded();

@ -333,6 +334,11 @@ MergeTreeData::MergeTreeData(
        LOG_WARNING(log, "{} Settings 'min_rows_for_wide_part', 'min_bytes_for_wide_part', "
            "'min_rows_for_compact_part' and 'min_bytes_for_compact_part' will be ignored.", reason);

+#if !USE_ROCKSDB
+    if (use_metadata_cache)
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "Can't use merge tree metadata cache if clickhouse was compiled without rocksdb");
+#endif
+
    common_assignee_trigger = [this] (bool delay) noexcept
    {
        if (delay)
@ -1372,7 +1378,6 @@ void MergeTreeData::loadDataParts(bool skip_sanity_checks)
    LOG_DEBUG(log, "Loaded data parts ({} items)", data_parts_indexes.size());
 }

-
 /// Is the part directory old.
 /// True if its modification time and the modification time of all files inside it is less then threshold.
 /// (Only files on the first level of nesting are considered).
--- a/src/Storages/MergeTree/MergeTreeData.h
+++ b/src/Storages/MergeTree/MergeTreeData.h
@ -946,6 +946,7 @@ protected:
    friend class StorageReplicatedMergeTree;
    friend class MergeTreeDataWriter;
    friend class MergeTask;
+    friend class IPartMetadataManager;

    bool require_part_metadata;

@ -1028,6 +1029,7 @@ protected:
    /// And for ReplicatedMergeTree we don't have LogEntry type for this operation.
    BackgroundJobsAssignee background_operations_assignee;
    BackgroundJobsAssignee background_moves_assignee;
+    bool use_metadata_cache;

    /// Strongly connected with two fields above.
    /// Every task that is finished will ask to assign a new one into an executor.
--- a/src/Storages/MergeTree/MergeTreeDataPartWide.h
+++ b/src/Storages/MergeTree/MergeTreeDataPartWide.h
@ -69,6 +69,7 @@ private:
    ColumnSize getColumnSizeImpl(const NameAndTypePair & column, std::unordered_set<String> * processed_substreams) const;

    void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
+
 };

 }
--- a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
@ -877,12 +877,22 @@ RangesInDataParts MergeTreeDataSelectExecutor::filterPartsByPrimaryKeyAndSkipInd
    {
        std::atomic<size_t> total_rows{0};

+        /// Do not check number of read rows if we have reading
+        /// in order of sorting key with limit.
+        /// In general case, when there exists WHERE clause
+        /// it's impossible to estimate number of rows precisely,
+        /// because we can stop reading at any time.
+
        SizeLimits limits;
-        if (settings.read_overflow_mode == OverflowMode::THROW && settings.max_rows_to_read)
+        if (settings.read_overflow_mode == OverflowMode::THROW
+            && settings.max_rows_to_read
+            && !query_info.input_order_info)
            limits = SizeLimits(settings.max_rows_to_read, 0, settings.read_overflow_mode);

        SizeLimits leaf_limits;
-        if (settings.read_overflow_mode_leaf == OverflowMode::THROW && settings.max_rows_to_read_leaf)
+        if (settings.read_overflow_mode_leaf == OverflowMode::THROW
+            && settings.max_rows_to_read_leaf
+            && !query_info.input_order_info)
            leaf_limits = SizeLimits(settings.max_rows_to_read_leaf, 0, settings.read_overflow_mode_leaf);

        auto mark_cache = context->getIndexMarkCache();
--- a/src/Storages/MergeTree/MergeTreeIOSettings.h
+++ b/src/Storages/MergeTree/MergeTreeIOSettings.h
@ -20,6 +20,8 @@ struct MergeTreeReaderSettings
    bool save_marks_in_cache = false;
    /// Validate checksums on reading (should be always enabled in production).
    bool checksum_on_read = true;
+    /// True if we read in order of sorting key.
+    bool read_in_order = false;
 };

 struct MergeTreeWriterSettings
--- a/src/Storages/MergeTree/MergeTreeMetadataCache.cpp
+++ b/src/Storages/MergeTree/MergeTreeMetadataCache.cpp
@ -0,0 +1,107 @@
+#include "MergeTreeMetadataCache.h"
+
+#if USE_ROCKSDB
+#include <Common/ProfileEvents.h>
+#include <base/logger_useful.h>
+
+namespace ProfileEvents
+{
+    extern const Event MergeTreeMetadataCachePut;
+    extern const Event MergeTreeMetadataCacheGet;
+    extern const Event MergeTreeMetadataCacheDelete;
+    extern const Event MergeTreeMetadataCacheSeek;
+}
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int SYSTEM_ERROR;
+}
+
+
+std::unique_ptr<MergeTreeMetadataCache> MergeTreeMetadataCache::create(const String & dir, size_t size)
+{
+    assert(size != 0);
+    rocksdb::Options options;
+    rocksdb::BlockBasedTableOptions table_options;
+    rocksdb::DB * db;
+
+    options.create_if_missing = true;
+    auto cache = rocksdb::NewLRUCache(size);
+    table_options.block_cache = cache;
+    options.table_factory.reset(rocksdb::NewBlockBasedTableFactory(table_options));
+    rocksdb::Status status = rocksdb::DB::Open(options, dir, &db);
+    if (status != rocksdb::Status::OK())
+        throw Exception(
+            ErrorCodes::SYSTEM_ERROR,
+            "Fail to open rocksdb path at: {} status:{}. You can try to remove the cache (this will not affect any table data).",
+            dir,
+            status.ToString());
+    return std::make_unique<MergeTreeMetadataCache>(db);
+}
+
+MergeTreeMetadataCache::Status MergeTreeMetadataCache::put(const String & key, const String & value)
+{
+    auto options = rocksdb::WriteOptions();
+    options.sync = true;
+    options.disableWAL = false;
+    auto status = rocksdb->Put(options, key, value);
+    ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCachePut);
+    return status;
+}
+
+MergeTreeMetadataCache::Status MergeTreeMetadataCache::del(const String & key)
+{
+    auto options = rocksdb::WriteOptions();
+    options.sync = true;
+    options.disableWAL = false;
+    auto status = rocksdb->Delete(options, key);
+    ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheDelete);
+    LOG_TRACE(log, "Delete key:{} from MergeTreeMetadataCache status:{}", key, status.ToString());
+    return status;
+}
+
+MergeTreeMetadataCache::Status MergeTreeMetadataCache::get(const String & key, String & value)
+{
+    auto status = rocksdb->Get(rocksdb::ReadOptions(), key, &value);
+    ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheGet);
+    LOG_TRACE(log, "Get key:{} from MergeTreeMetadataCache status:{}", key, status.ToString());
+    return status;
+}
+
+void MergeTreeMetadataCache::getByPrefix(const String & prefix, Strings & keys, Strings & values)
+{
+    auto * it = rocksdb->NewIterator(rocksdb::ReadOptions());
+    rocksdb::Slice target(prefix);
+    for (it->Seek(target); it->Valid(); it->Next())
+    {
+        const auto key = it->key();
+        if (!key.starts_with(target))
+            break;
+
+        const auto value = it->value();
+        keys.emplace_back(key.data(), key.size());
+        values.emplace_back(value.data(), value.size());
+    }
+    LOG_TRACE(log, "Seek with prefix:{} from MergeTreeMetadataCache items:{}", prefix, keys.size());
+    ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheSeek);
+    delete it;
+}
+
+uint64_t MergeTreeMetadataCache::getEstimateNumKeys() const
+{
+    uint64_t keys = 0;
+    rocksdb->GetAggregatedIntProperty("rocksdb.estimate-num-keys", &keys);
+    return keys;
+}
+
+void MergeTreeMetadataCache::shutdown()
+{
+    rocksdb->Close();
+    rocksdb.reset();
+}
+
+}
+
+#endif
--- a/src/Storages/MergeTree/MergeTreeMetadataCache.h
+++ b/src/Storages/MergeTree/MergeTreeMetadataCache.h
@ -0,0 +1,45 @@
+#pragma once
+
+#include "config_core.h"
+
+#if USE_ROCKSDB
+#include <base/types.h>
+#include <Core/Types.h>
+#include <Poco/Logger.h>
+#include <rocksdb/table.h>
+#include <rocksdb/db.h>
+
+namespace DB
+{
+class MergeTreeMetadataCache
+{
+public:
+    using Status = rocksdb::Status;
+
+    static std::unique_ptr<MergeTreeMetadataCache> create(const String & dir, size_t size);
+
+    explicit MergeTreeMetadataCache(rocksdb::DB * rocksdb_) : rocksdb{rocksdb_}
+    {
+        assert(rocksdb);
+    }
+
+    MergeTreeMetadataCache(const MergeTreeMetadataCache &) = delete;
+
+    MergeTreeMetadataCache & operator=(const MergeTreeMetadataCache &) = delete;
+
+    Status put(const String & key, const String & value);
+    Status del(const String & key);
+    Status get(const String & key, String & value);
+    void getByPrefix(const String & prefix, Strings & keys, Strings & values);
+    uint64_t getEstimateNumKeys() const;
+
+    void shutdown();
+private:
+    std::unique_ptr<rocksdb::DB> rocksdb;
+    Poco::Logger * log = &Poco::Logger::get("MergeTreeMetadataCache");
+};
+
+using MergeTreeMetadataCachePtr = std::shared_ptr<MergeTreeMetadataCache>;
+}
+
+#endif
--- a/src/Storages/MergeTree/MergeTreePartition.cpp
+++ b/src/Storages/MergeTree/MergeTreePartition.cpp
@ -178,12 +178,6 @@ namespace
    };
 }

-static std::unique_ptr<ReadBufferFromFileBase> openForReading(const DiskPtr & disk, const String & path)
-{
-    size_t file_size = disk->getFileSize(path);
-    return disk->readFile(path, ReadSettings().adjustBufferSize(file_size), file_size);
-}
-
 String MergeTreePartition::getID(const MergeTreeData & storage) const
 {
    return getID(storage.getInMemoryMetadataPtr()->getPartitionKey().sample_block);
@ -373,15 +367,15 @@ void MergeTreePartition::serializeText(const MergeTreeData & storage, WriteBuffe
    }
 }

-void MergeTreePartition::load(const MergeTreeData & storage, const DiskPtr & disk, const String & part_path)
+void MergeTreePartition::load(const MergeTreeData & storage, const PartMetadataManagerPtr & manager)
 {
    auto metadata_snapshot = storage.getInMemoryMetadataPtr();
    if (!metadata_snapshot->hasPartitionKey())
        return;

    const auto & partition_key_sample = adjustPartitionKey(metadata_snapshot, storage.getContext()).sample_block;
-    auto partition_file_path = part_path + "partition.dat";
-    auto file = openForReading(disk, partition_file_path);
+
+    auto file = manager->read("partition.dat");
    value.resize(partition_key_sample.columns());
    for (size_t i = 0; i < partition_key_sample.columns(); ++i)
        partition_key_sample.getByPosition(i).type->getDefaultSerialization()->deserializeBinary(value[i], *file);
@ -402,7 +396,9 @@ std::unique_ptr<WriteBufferFromFileBase> MergeTreePartition::store(const Block &
    auto out = disk->writeFile(part_path + "partition.dat");
    HashingWriteBuffer out_hashing(*out);
    for (size_t i = 0; i < value.size(); ++i)
+    {
        partition_key_sample.getByPosition(i).type->getDefaultSerialization()->serializeBinary(value[i], out_hashing);
+    }

    out_hashing.next();
    checksums.files["partition.dat"].file_size = out_hashing.count();
@ -462,4 +458,14 @@ KeyDescription MergeTreePartition::adjustPartitionKey(const StorageMetadataPtr &
    return partition_key;
 }

+
+void MergeTreePartition::appendFiles(const MergeTreeData & storage, Strings& files)
+{
+    auto metadata_snapshot = storage.getInMemoryMetadataPtr();
+    if (!metadata_snapshot->hasPartitionKey())
+        return;
+
+    files.push_back("partition.dat");
+}
+
 }
--- a/src/Storages/MergeTree/MergeTreePartition.h
+++ b/src/Storages/MergeTree/MergeTreePartition.h
@ -4,6 +4,7 @@
 #include <Disks/IDisk.h>
 #include <IO/WriteBuffer.h>
 #include <Storages/KeyDescription.h>
+#include <Storages/MergeTree/IPartMetadataManager.h>
 #include <Core/Field.h>

 namespace DB
@ -37,7 +38,8 @@ public:

    void serializeText(const MergeTreeData & storage, WriteBuffer & out, const FormatSettings & format_settings) const;

-    void load(const MergeTreeData & storage, const DiskPtr & disk, const String & part_path);
+    void load(const MergeTreeData & storage, const PartMetadataManagerPtr & manager);
+
    /// Store functions return write buffer with written but not finalized data.
    /// User must call finish() for returned object.
    [[nodiscard]] std::unique_ptr<WriteBufferFromFileBase> store(const MergeTreeData & storage, const DiskPtr & disk, const String & part_path, MergeTreeDataPartChecksums & checksums) const;
@ -47,6 +49,8 @@ public:

    void create(const StorageMetadataPtr & metadata_snapshot, Block block, size_t row, ContextPtr context);

+    static void appendFiles(const MergeTreeData & storage, Strings & files);
+
    /// Adjust partition key and execute its expression on block. Return sample block according to used expression.
    static NamesAndTypesList executePartitionByExpression(const StorageMetadataPtr & metadata_snapshot, Block & block, ContextPtr context);

--- a/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp
+++ b/src/Storages/MergeTree/MergeTreeSelectProcessor.cpp
@ -39,9 +39,12 @@ MergeTreeSelectProcessor::MergeTreeSelectProcessor(
 {
    /// Actually it means that parallel reading from replicas enabled
    /// and we have to collaborate with initiator.
-    /// In this case we won't set approximate rows, because it will be accounted multiple times
-    if (!extension_.has_value())
+    /// In this case we won't set approximate rows, because it will be accounted multiple times.
+    /// Also do not count amount of read rows if we read in order of sorting key,
+    /// because we don't know actual amount of read rows in case when limit is set.
+    if (!extension_.has_value() && !reader_settings.read_in_order)
        addTotalRowsApprox(total_rows);
+
    ordered_names = header_without_virtual_columns.getNames();
 }

--- a/src/Storages/MergeTree/MergeTreeSequentialSource.cpp
+++ b/src/Storages/MergeTree/MergeTreeSequentialSource.cpp
@ -41,7 +41,7 @@ MergeTreeSequentialSource::MergeTreeSequentialSource(
    addTotalRowsApprox(data_part->rows_count);

    /// Add columns because we don't want to read empty blocks
-    injectRequiredColumns(storage, storage_snapshot->metadata, data_part, columns_to_read);
+    injectRequiredColumns(storage, storage_snapshot, data_part, columns_to_read);
    NamesAndTypesList columns_for_reader;
    if (take_column_types_from_storage)
    {
--- a/src/Storages/MergeTree/MergeTreeSettings.h
+++ b/src/Storages/MergeTree/MergeTreeSettings.h
@ -139,6 +139,7 @@ struct Settings;
    /** Experimental/work in progress feature. Unsafe for production. */ \
    M(UInt64, part_moves_between_shards_enable, 0, "Experimental/Incomplete feature to move parts between shards. Does not take into account sharding expressions.", 0) \
    M(UInt64, part_moves_between_shards_delay_seconds, 30, "Time to wait before/after moving parts between shards.", 0) \
+    M(Bool, use_metadata_cache, false, "Experimental feature to speed up parts loading process by using MergeTree metadata cache", 0) \
    \
    /** Obsolete settings. Kept for backward compatibility only. */ \
    M(UInt64, min_relative_delay_to_yield_leadership, 120, "Obsolete setting, does nothing.", 0) \
--- a/src/Storages/MergeTree/PartMetadataManagerOrdinary.cpp
+++ b/src/Storages/MergeTree/PartMetadataManagerOrdinary.cpp
@ -0,0 +1,33 @@
+#include "PartMetadataManagerOrdinary.h"
+
+#include <IO/ReadBufferFromFileBase.h>
+#include <Disks/IDisk.h>
+#include <Storages/MergeTree/IMergeTreeDataPart.h>
+
+namespace DB
+{
+
+static std::unique_ptr<ReadBufferFromFileBase> openForReading(const DiskPtr & disk, const String & path)
+{
+    size_t file_size = disk->getFileSize(path);
+    return disk->readFile(path, ReadSettings().adjustBufferSize(file_size), file_size);
+}
+
+PartMetadataManagerOrdinary::PartMetadataManagerOrdinary(const IMergeTreeDataPart * part_) : IPartMetadataManager(part_)
+{
+}
+
+
+std::unique_ptr<SeekableReadBuffer> PartMetadataManagerOrdinary::read(const String & file_name) const
+{
+    String file_path = fs::path(part->getFullRelativePath()) / file_name;
+    return openForReading(disk, file_path);
+}
+
+bool PartMetadataManagerOrdinary::exists(const String & file_name) const
+{
+    return disk->exists(fs::path(part->getFullRelativePath()) / file_name);
+}
+
+
+}
--- a/src/Storages/MergeTree/PartMetadataManagerOrdinary.h
+++ b/src/Storages/MergeTree/PartMetadataManagerOrdinary.h
@ -0,0 +1,29 @@
+#pragma once
+
+#include <Storages/MergeTree/IPartMetadataManager.h>
+
+namespace DB
+{
+
+class PartMetadataManagerOrdinary : public IPartMetadataManager
+{
+public:
+    explicit PartMetadataManagerOrdinary(const IMergeTreeDataPart * part_);
+
+    ~PartMetadataManagerOrdinary() override = default;
+
+    std::unique_ptr<SeekableReadBuffer> read(const String & file_name) const override;
+
+    bool exists(const String & file_name) const override;
+
+    void deleteAll(bool /*include_projection*/) override {}
+
+    void assertAllDeleted(bool /*include_projection*/) const override {}
+
+    void updateAll(bool /*include_projection*/) override {}
+
+    std::unordered_map<String, uint128> check() const override { return {}; }
+};
+
+
+}
--- a/src/Storages/MergeTree/PartMetadataManagerWithCache.cpp
+++ b/src/Storages/MergeTree/PartMetadataManagerWithCache.cpp
@ -0,0 +1,273 @@
+#include "PartMetadataManagerWithCache.h"
+
+#if USE_ROCKSDB
+#include <Common/hex.h>
+#include <Common/ErrorCodes.h>
+#include <IO/HashingReadBuffer.h>
+#include <IO/ReadBufferFromString.h>
+#include <Storages/MergeTree/IMergeTreeDataPart.h>
+
+namespace ProfileEvents
+{
+    extern const Event MergeTreeMetadataCacheHit;
+    extern const Event MergeTreeMetadataCacheMiss;
+}
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int LOGICAL_ERROR;
+    extern const int CORRUPTED_DATA;
+    extern const int NO_SUCH_PROJECTION_IN_TABLE;
+}
+
+PartMetadataManagerWithCache::PartMetadataManagerWithCache(const IMergeTreeDataPart * part_, const MergeTreeMetadataCachePtr & cache_)
+    : IPartMetadataManager(part_), cache(cache_)
+{
+}
+
+String PartMetadataManagerWithCache::getKeyFromFilePath(const String & file_path) const
+{
+    return disk->getName() + ":" + file_path;
+}
+
+String PartMetadataManagerWithCache::getFilePathFromKey(const String & key) const
+{
+    return key.substr(disk->getName().size() + 1);
+}
+
+std::unique_ptr<SeekableReadBuffer> PartMetadataManagerWithCache::read(const String & file_name) const
+{
+    String file_path = fs::path(part->getFullRelativePath()) / file_name;
+    String key = getKeyFromFilePath(file_path);
+    String value;
+    auto status = cache->get(key, value);
+    if (!status.ok())
+    {
+        ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheMiss);
+        auto in = disk->readFile(file_path);
+        readStringUntilEOF(value, *in);
+        cache->put(key, value);
+    }
+    else
+    {
+        ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheHit);
+    }
+    return std::make_unique<ReadBufferFromOwnString>(value);
+}
+
+bool PartMetadataManagerWithCache::exists(const String & file_name) const
+{
+    String file_path = fs::path(part->getFullRelativePath()) / file_name;
+    String key = getKeyFromFilePath(file_path);
+    String value;
+    auto status = cache->get(key, value);
+    if (status.ok())
+    {
+        ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheHit);
+        return true;
+    }
+    else
+    {
+        ProfileEvents::increment(ProfileEvents::MergeTreeMetadataCacheMiss);
+        return disk->exists(fs::path(part->getFullRelativePath()) / file_name);
+    }
+}
+
+void PartMetadataManagerWithCache::deleteAll(bool include_projection)
+{
+    Strings file_names;
+    part->appendFilesOfColumnsChecksumsIndexes(file_names, include_projection);
+
+    String value;
+    for (const auto & file_name : file_names)
+    {
+        String file_path = fs::path(part->getFullRelativePath()) / file_name;
+        String key = getKeyFromFilePath(file_path);
+        auto status = cache->del(key);
+        if (!status.ok())
+        {
+            status = cache->get(key, value);
+            if (status.IsNotFound())
+                continue;
+
+            throw Exception(
+                ErrorCodes::LOGICAL_ERROR,
+                "deleteAll failed include_projection:{} status:{}, file_path:{}",
+                include_projection,
+                status.ToString(),
+                file_path);
+        }
+    }
+}
+
+void PartMetadataManagerWithCache::updateAll(bool include_projection)
+{
+    Strings file_names;
+    part->appendFilesOfColumnsChecksumsIndexes(file_names, include_projection);
+
+    String value;
+    String read_value;
+    for (const auto & file_name : file_names)
+    {
+        String file_path = fs::path(part->getFullRelativePath()) / file_name;
+        if (!disk->exists(file_path))
+            continue;
+        auto in = disk->readFile(file_path);
+        readStringUntilEOF(value, *in);
+
+        String key = getKeyFromFilePath(file_path);
+        auto status = cache->put(key, value);
+        if (!status.ok())
+        {
+            status = cache->get(key, read_value);
+            if (status.IsNotFound() || read_value == value)
+                continue;
+
+            throw Exception(
+                ErrorCodes::LOGICAL_ERROR,
+                "updateAll failed include_projection:{} status:{}, file_path:{}",
+                include_projection,
+                status.ToString(),
+                file_path);
+        }
+    }
+}
+
+void PartMetadataManagerWithCache::assertAllDeleted(bool include_projection) const
+{
+    Strings keys;
+    std::vector<uint128> _;
+    getKeysAndCheckSums(keys, _);
+    if (keys.empty())
+        return;
+
+    String file_path;
+    String file_name;
+    for (const auto & key : keys)
+    {
+        file_path = getFilePathFromKey(key);
+        file_name = fs::path(file_path).filename();
+
+        /// Metadata file belongs to current part
+        if (fs::path(part->getFullRelativePath()) / file_name == file_path)
+            throw Exception(
+                ErrorCodes::LOGICAL_ERROR,
+                "Data part {} with type {} with meta file {} still in cache",
+                part->name,
+                part->getType().toString(),
+                file_path);
+
+        /// File belongs to projection part of current part
+        if (!part->isProjectionPart() && include_projection)
+        {
+            const auto & projection_parts = part->getProjectionParts();
+            for (const auto & [projection_name, projection_part] : projection_parts)
+            {
+                if (fs::path(projection_part->getFullRelativePath()) / file_name == file_path)
+                {
+                    throw Exception(
+                        ErrorCodes::LOGICAL_ERROR,
+                        "Data part {} with type {} with meta file {} with projection name still in cache",
+                        part->name,
+                        part->getType().toString(),
+                        file_path,
+                        projection_name);
+                }
+            }
+        }
+    }
+}
+
+void PartMetadataManagerWithCache::getKeysAndCheckSums(Strings & keys, std::vector<uint128> & checksums) const
+{
+    String prefix = getKeyFromFilePath(fs::path(part->getFullRelativePath()) / "");
+    Strings values;
+    cache->getByPrefix(prefix, keys, values);
+    size_t size = keys.size();
+    for (size_t i = 0; i < size; ++i)
+    {
+        ReadBufferFromString rbuf(values[i]);
+        HashingReadBuffer hbuf(rbuf);
+        checksums.push_back(hbuf.getHash());
+    }
+}
+
+std::unordered_map<String, IPartMetadataManager::uint128> PartMetadataManagerWithCache::check() const
+{
+    /// Only applies for normal part stored on disk
+    if (part->isProjectionPart() || !part->isStoredOnDisk())
+        return {};
+
+    /// The directory of projection part is under the directory of its parent part
+    const auto filenames_without_checksums = part->getFileNamesWithoutChecksums();
+
+    std::unordered_map<String, uint128> results;
+    Strings keys;
+    std::vector<uint128> cache_checksums;
+    std::vector<uint128> disk_checksums;
+    getKeysAndCheckSums(keys, cache_checksums);
+    for (size_t i = 0; i < keys.size(); ++i)
+    {
+        const auto & key = keys[i];
+        String file_path = getFilePathFromKey(key);
+        String file_name = fs::path(file_path).filename();
+        results.emplace(file_name, cache_checksums[i]);
+
+        /// File belongs to normal part
+        if (fs::path(part->getFullRelativePath()) / file_name == file_path)
+        {
+            auto disk_checksum = part->getActualChecksumByFile(file_path);
+            if (disk_checksum != cache_checksums[i])
+                throw Exception(
+                    ErrorCodes::CORRUPTED_DATA,
+                    "Checksums doesn't match in part {}. Expected: {}. Found {}.",
+                    part->name,
+                    getHexUIntUppercase(disk_checksum.first) + getHexUIntUppercase(disk_checksum.second),
+                    getHexUIntUppercase(cache_checksums[i].first) + getHexUIntUppercase(cache_checksums[i].second));
+
+            disk_checksums.push_back(disk_checksum);
+            continue;
+        }
+
+        /// File belongs to projection part
+        String proj_dir_name = fs::path(file_path).parent_path().filename();
+        auto pos = proj_dir_name.find_last_of('.');
+        if (pos == String::npos)
+        {
+            throw Exception(
+                ErrorCodes::NO_SUCH_PROJECTION_IN_TABLE,
+                "There is no projection in part: {} contains file: {} with directory name: {}",
+                part->name,
+                file_path,
+                proj_dir_name);
+        }
+
+        String proj_name = proj_dir_name.substr(0, pos);
+        const auto & projection_parts = part->getProjectionParts();
+        auto it = projection_parts.find(proj_name);
+        if (it == projection_parts.end())
+        {
+            throw Exception(
+                ErrorCodes::NO_SUCH_PROJECTION_IN_TABLE,
+                "There is no projection {} in part: {} contains file: {}",
+                proj_name, part->name, file_path);
+        }
+
+        auto disk_checksum = it->second->getActualChecksumByFile(file_path);
+        if (disk_checksum != cache_checksums[i])
+            throw Exception(
+                ErrorCodes::CORRUPTED_DATA,
+                "Checksums doesn't match in projection part {} {}. Expected: {}. Found {}.",
+                part->name, proj_name,
+                getHexUIntUppercase(disk_checksum.first) + getHexUIntUppercase(disk_checksum.second),
+                getHexUIntUppercase(cache_checksums[i].first) + getHexUIntUppercase(cache_checksums[i].second));
+        disk_checksums.push_back(disk_checksum);
+    }
+    return results;
+}
+
+}
+#endif
--- a/src/Storages/MergeTree/PartMetadataManagerWithCache.h
+++ b/src/Storages/MergeTree/PartMetadataManagerWithCache.h
@ -0,0 +1,56 @@
+#pragma once
+
+#include "config_core.h"
+
+#if USE_ROCKSDB
+#include <Storages/MergeTree/IPartMetadataManager.h>
+#include <Storages/MergeTree/MergeTreeMetadataCache.h>
+
+namespace DB
+{
+
+/// PartMetadataManagerWithCache stores metadatas of part in RocksDB as cache layer to speed up
+/// loading process of merge tree table.
+class PartMetadataManagerWithCache : public IPartMetadataManager
+{
+public:
+    PartMetadataManagerWithCache(const IMergeTreeDataPart * part_, const MergeTreeMetadataCachePtr & cache_);
+
+    ~PartMetadataManagerWithCache() override = default;
+
+    /// First read the metadata from RocksDB cache, then from disk.
+    std::unique_ptr<SeekableReadBuffer> read(const String & file_name) const override;
+
+    /// First judge existence of the metadata in RocksDB cache, then in disk.
+    bool exists(const String & file_name) const override;
+
+    /// Delete all metadatas in part from RocksDB cache.
+    void deleteAll(bool include_projection) override;
+
+    /// Assert all metadatas in part from RocksDB cache are deleted.
+    void assertAllDeleted(bool include_projection) const override;
+
+    /// Update all metadatas in part from RocksDB cache.
+    /// Need to be called after part directory is renamed.
+    void updateAll(bool include_projection) override;
+
+    /// Check if all metadatas in part from RocksDB cache are up to date.
+    std::unordered_map<String, uint128> check() const override;
+
+private:
+    /// Get cache key from path of metadata file.
+    /// Format: <disk_name>:relative/full/path/of/metadata/file
+    String getKeyFromFilePath(const String & file_path) const;
+
+    /// Get metadata file path from cache key.
+    String getFilePathFromKey(const String & key) const;
+
+    /// Get cache keys and checksums of corresponding metadata in a part(including projection parts)
+    void getKeysAndCheckSums(Strings & keys, std::vector<uint128> & checksums) const;
+
+
+    MergeTreeMetadataCachePtr cache;
+};
+
+}
+#endif
--- a/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp
+++ b/src/Storages/MergeTree/ReplicatedMergeTreePartCheckThread.cpp
@ -399,6 +399,7 @@ CheckResult ReplicatedMergeTreePartCheckThread::checkPart(const String & part_na
        LOG_WARNING(log, "We have part {} covering part {}", part->name, part_name);
    }

+    part->checkMetadata();
    return {part_name, true, ""};
 }

--- a/src/Storages/MergeTree/tests/gtest_merge_tree_metadata_cache.cpp
+++ b/src/Storages/MergeTree/tests/gtest_merge_tree_metadata_cache.cpp
@ -0,0 +1,83 @@
+#include "config_core.h"
+
+#if USE_ROCKSDB
+#include <gtest/gtest.h>
+#include <rocksdb/table.h>
+#include <rocksdb/db.h>
+#include <Interpreters/Context.h>
+#include <Storages/MergeTree/MergeTreeMetadataCache.h>
+
+using namespace DB;
+
+class MergeTreeMetadataCacheTest : public ::testing::Test
+{
+public:
+    void SetUp() override
+    {
+        cache = MergeTreeMetadataCache::create("./db/", 268435456);
+    }
+
+    void TearDown() override
+    {
+        cache->shutdown();
+        cache.reset();
+    }
+
+    MergeTreeMetadataCachePtr cache;
+};
+
+TEST_F(MergeTreeMetadataCacheTest, testCommon)
+{
+    std::vector<String> files
+        = {"columns.txt", "checksums.txt", "primary.idx", "count.txt", "partition.dat", "minmax_p.idx", "default_compression_codec.txt"};
+    String prefix = "data/test_metadata_cache/check_part_metadata_cache/201806_1_1_0_4/";
+
+    for (const auto & file : files)
+    {
+        auto status = cache->put(prefix + file, prefix + file);
+        ASSERT_EQ(status.code(), rocksdb::Status::Code::kOk);
+    }
+
+    for (const auto & file : files)
+    {
+        String value;
+        auto status = cache->get(prefix + file, value);
+        ASSERT_EQ(status.code(), rocksdb::Status::Code::kOk);
+        ASSERT_EQ(value, prefix + file);
+    }
+
+    {
+        Strings keys;
+        Strings values;
+        cache->getByPrefix(prefix, keys, values);
+        ASSERT_EQ(keys.size(), files.size());
+        ASSERT_EQ(values.size(), files.size());
+        for (size_t i = 0; i < files.size(); ++i)
+        {
+            ASSERT_EQ(values[i], keys[i]);
+        }
+    }
+
+    for (const auto & file : files)
+    {
+        auto status = cache->del(prefix + file);
+        ASSERT_EQ(status.code(), rocksdb::Status::Code::kOk);
+    }
+
+    for (const auto & file : files)
+    {
+        String value;
+        auto status = cache->get(prefix + file, value);
+        ASSERT_EQ(status.code(), rocksdb::Status::Code::kNotFound);
+    }
+
+    {
+        Strings keys;
+        Strings values;
+        cache->getByPrefix(prefix, keys, values);
+        ASSERT_EQ(keys.size(), 0);
+        ASSERT_EQ(values.size(), 0);
+    }
+}
+
+#endif
--- a/src/Storages/StorageMergeTree.cpp
+++ b/src/Storages/StorageMergeTree.cpp
@ -1616,6 +1616,8 @@ CheckResults StorageMergeTree::checkData(const ASTPtr & query, ContextPtr local_
                auto out = disk->writeFile(tmp_checksums_path, 4096);
                part->checksums.write(*out);
                disk->moveFile(tmp_checksums_path, checksums_path);
+
+                part->checkMetadata();
                results.emplace_back(part->name, true, "Checksums recounted and written to disk.");
            }
            catch (const Exception & ex)
@ -1632,6 +1634,7 @@ CheckResults StorageMergeTree::checkData(const ASTPtr & query, ContextPtr local_
            try
            {
                checkDataPart(part, true);
+                part->checkMetadata();
                results.emplace_back(part->name, true, "");
            }
            catch (const Exception & ex)
--- a/src/Storages/StorageSnapshot.cpp
+++ b/src/Storages/StorageSnapshot.cpp
@ -51,40 +51,42 @@ NamesAndTypesList StorageSnapshot::getColumns(const GetColumnsOptions & options)
 NamesAndTypesList StorageSnapshot::getColumnsByNames(const GetColumnsOptions & options, const Names & names) const
 {
    NamesAndTypesList res;
-    const auto & columns = getMetadataForQuery()->getColumns();
    for (const auto & name : names)
-    {
-        auto column = columns.tryGetColumn(options, name);
-        if (column && !isObject(column->type))
-        {
-            res.emplace_back(std::move(*column));
-            continue;
+        res.push_back(getColumn(options, name));
+    return res;
 }

+std::optional<NameAndTypePair> StorageSnapshot::tryGetColumn(const GetColumnsOptions & options, const String & column_name) const
+{
+    const auto & columns = getMetadataForQuery()->getColumns();
+    auto column = columns.tryGetColumn(options, column_name);
+    if (column && (!isObject(column->type) || !options.with_extended_objects))
+        return column;
+
    if (options.with_extended_objects)
    {
-            auto object_column = object_columns.tryGetColumn(options, name);
+        auto object_column = object_columns.tryGetColumn(options, column_name);
        if (object_column)
-            {
-                res.emplace_back(std::move(*object_column));
-                continue;
-            }
+            return object_column;
    }

    if (options.with_virtuals)
    {
-            auto it = virtual_columns.find(name);
+        auto it = virtual_columns.find(column_name);
        if (it != virtual_columns.end())
+            return NameAndTypePair(column_name, it->second);
+    }
+
+    return {};
+}
+
+NameAndTypePair StorageSnapshot::getColumn(const GetColumnsOptions & options, const String & column_name) const
 {
-                res.emplace_back(name, it->second);
-                continue;
-            }
-        }
+    auto column = tryGetColumn(options, column_name);
+    if (!column)
+        throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "There is no column {} in table", column_name);

-        throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "There is no column {} in table", name);
-    }
-
-    return res;
+    return *column;
 }

 Block StorageSnapshot::getSampleBlockForColumns(const Names & column_names) const
--- a/src/Storages/StorageSnapshot.h
+++ b/src/Storages/StorageSnapshot.h
@ -61,6 +61,10 @@ struct StorageSnapshot
    /// Get columns with types according to options only for requested names.
    NamesAndTypesList getColumnsByNames(const GetColumnsOptions & options, const Names & names) const;

+    /// Get column with type according to options for requested name.
+    std::optional<NameAndTypePair> tryGetColumn(const GetColumnsOptions & options, const String & column_name) const;
+    NameAndTypePair getColumn(const GetColumnsOptions & options, const String & column_name) const;
+
    /// Block with ordinary + materialized + aliases + virtuals + subcolumns.
    Block getSampleBlockForColumns(const Names & column_names) const;

--- a/src/Storages/StorageURL.cpp
+++ b/src/Storages/StorageURL.cpp
@ -560,6 +560,8 @@ ColumnsDescription IStorageURLBase::getTableStructureFromData(
    const std::optional<FormatSettings> & format_settings,
    ContextPtr context)
 {
+    context->getRemoteHostFilter().checkURL(Poco::URI(uri));
+
    Poco::Net::HTTPBasicCredentials credentials;

    std::vector<String> urls_to_check;
--- a/src/Storages/System/StorageSystemMergeTreeMetadataCache.cpp
+++ b/src/Storages/System/StorageSystemMergeTreeMetadataCache.cpp
@ -0,0 +1,143 @@
+#include <Storages/System/StorageSystemMergeTreeMetadataCache.h>
+
+#if USE_ROCKSDB
+#include <DataTypes/DataTypeDateTime.h>
+#include <DataTypes/DataTypeString.h>
+#include <DataTypes/DataTypesNumber.h>
+#include <Interpreters/Context.h>
+#include <Parsers/ASTExpressionList.h>
+#include <Parsers/ASTFunction.h>
+#include <Parsers/ASTIdentifier.h>
+#include <Parsers/ASTLiteral.h>
+#include <Parsers/ASTSelectQuery.h>
+#include <Storages/MergeTree/KeyCondition.h>
+#include <Storages/MergeTree/MergeTreeMetadataCache.h>
+#include <Common/typeid_cast.h>
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int BAD_ARGUMENTS;
+}
+
+NamesAndTypesList StorageSystemMergeTreeMetadataCache::getNamesAndTypes()
+{
+    return {
+        {"key", std::make_shared<DataTypeString>()},
+        {"value", std::make_shared<DataTypeString>()},
+    };
+}
+
+static bool extractKeyImpl(const IAST & elem, String & res, bool & precise)
+{
+    const auto * function = elem.as<ASTFunction>();
+    if (!function)
+        return false;
+
+    if (function->name == "and")
+    {
+        for (const auto & child : function->arguments->children)
+        {
+            bool tmp_precise = false;
+            if (extractKeyImpl(*child, res, tmp_precise))
+            {
+                precise = tmp_precise;
+                return true;
+            }
+        }
+        return false;
+    }
+
+    if (function->name == "equals" || function->name == "like")
+    {
+        const auto & args = function->arguments->as<ASTExpressionList &>();
+        const IAST * value;
+
+        if (args.children.size() != 2)
+            return false;
+
+        const ASTIdentifier * ident;
+        if ((ident = args.children.at(0)->as<ASTIdentifier>()))
+            value = args.children.at(1).get();
+        else if ((ident = args.children.at(1)->as<ASTIdentifier>()))
+            value = args.children.at(0).get();
+        else
+            return false;
+
+        if (ident->name() != "key")
+            return false;
+
+        const auto * literal = value->as<ASTLiteral>();
+        if (!literal)
+            return false;
+
+        if (literal->value.getType() != Field::Types::String)
+            return false;
+
+        res = literal->value.safeGet<String>();
+        precise = function->name == "equals";
+        return true;
+    }
+    return false;
+}
+
+
+/// Retrieve from the query a condition of the form `key= 'key'`, from conjunctions in the WHERE clause.
+static String extractKey(const ASTPtr & query, bool& precise)
+{
+    const auto & select = query->as<ASTSelectQuery &>();
+    if (!select.where())
+        return "";
+
+    String res;
+    return extractKeyImpl(*select.where(), res, precise) ? res : "";
+}
+
+
+void StorageSystemMergeTreeMetadataCache::fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const
+{
+    bool precise = false;
+    String key = extractKey(query_info.query, precise);
+    if (key.empty())
+        throw Exception(
+            "SELECT from system.merge_tree_metadata_cache table must contain condition like key = 'key' or key LIKE 'prefix%' in WHERE clause.", ErrorCodes::BAD_ARGUMENTS);
+
+    auto cache = context->getMergeTreeMetadataCache();
+    if (precise)
+    {
+        String value;
+        if (cache->get(key, value) != MergeTreeMetadataCache::Status::OK())
+            return;
+
+        size_t col_num = 0;
+        res_columns[col_num++]->insert(key);
+        res_columns[col_num++]->insert(value);
+    }
+    else
+    {
+        String target = extractFixedPrefixFromLikePattern(key);
+        if (target.empty())
+            throw Exception(
+                "SELECT from system.merge_tree_metadata_cache table must contain condition like key = 'key' or key LIKE 'prefix%' in WHERE clause.", ErrorCodes::BAD_ARGUMENTS);
+
+        Strings keys;
+        Strings values;
+        keys.reserve(4096);
+        values.reserve(4096);
+        cache->getByPrefix(target, keys, values);
+        if (keys.empty())
+            return;
+
+        assert(keys.size() == values.size());
+        for (size_t i = 0; i < keys.size(); ++i)
+        {
+            size_t col_num = 0;
+            res_columns[col_num++]->insert(keys[i]);
+            res_columns[col_num++]->insert(values[i]);
+        }
+    }
+}
+
+}
+#endif
--- a/src/Storages/System/StorageSystemMergeTreeMetadataCache.h
+++ b/src/Storages/System/StorageSystemMergeTreeMetadataCache.h
@ -0,0 +1,32 @@
+#pragma once
+
+#include "config_core.h"
+
+#if USE_ROCKSDB
+#include <base/shared_ptr_helper.h>
+#include <Storages/System/IStorageSystemOneBlock.h>
+
+
+namespace DB
+{
+class Context;
+
+
+/// Implements `merge_tree_metadata_cache` system table, which allows you to view the metadata cache data in rocksdb for testing purposes.
+class StorageSystemMergeTreeMetadataCache : public shared_ptr_helper<StorageSystemMergeTreeMetadataCache>, public IStorageSystemOneBlock<StorageSystemMergeTreeMetadataCache>
+{
+    friend struct shared_ptr_helper<StorageSystemMergeTreeMetadataCache>;
+
+public:
+    std::string getName() const override { return "SystemMergeTreeMetadataCache"; }
+
+    static NamesAndTypesList getNamesAndTypes();
+
+protected:
+    using IStorageSystemOneBlock::IStorageSystemOneBlock;
+
+    void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
+};
+
+}
+#endif
--- a/src/Storages/System/attachSystemTables.cpp
+++ b/src/Storages/System/attachSystemTables.cpp
@ -75,6 +75,7 @@

 #if USE_ROCKSDB
 #include <Storages/RocksDB/StorageSystemRocksDB.h>
+#include <Storages/System/StorageSystemMergeTreeMetadataCache.h>
 #endif


@ -129,6 +130,7 @@ void attachSystemTablesLocal(ContextPtr context, IDatabase & system_database)
 #endif
 #if USE_ROCKSDB
    attach<StorageSystemRocksDB>(context, system_database, "rocksdb");
+    attach<StorageSystemMergeTreeMetadataCache>(context, system_database, "merge_tree_metadata_cache");
 #endif
 }

--- a/tests/ci/clickhouse_helper.py
+++ b/tests/ci/clickhouse_helper.py
@ -10,12 +10,12 @@ from get_robot_token import get_parameter_from_ssm
 class ClickHouseHelper:
    def __init__(self, url=None):
        if url is None:
-            self.url = get_parameter_from_ssm("clickhouse-test-stat-url2")
+            url = get_parameter_from_ssm("clickhouse-test-stat-url")
+
+        self.url = url
        self.auth = {
-                "X-ClickHouse-User": get_parameter_from_ssm(
-                    "clickhouse-test-stat-login2"
-                ),
-                "X-ClickHouse-Key": "",
+            "X-ClickHouse-User": get_parameter_from_ssm("clickhouse-test-stat-login"),
+            "X-ClickHouse-Key": get_parameter_from_ssm("clickhouse-test-stat-password")
        }

    @staticmethod
@ -179,7 +179,7 @@ def mark_flaky_tests(clickhouse_helper, check_name, test_results):
            check_name=check_name
        )

-        tests_data = clickhouse_helper.select_json_each_row("gh-data", query)
+        tests_data = clickhouse_helper.select_json_each_row("default", query)
        master_failed_tests = {row["test_name"] for row in tests_data}
        logging.info("Found flaky tests: %s", ", ".join(master_failed_tests))

--- a/tests/ci/compatibility_check.py
+++ b/tests/ci/compatibility_check.py
@ -197,4 +197,4 @@ if __name__ == "__main__":
        report_url,
        CHECK_NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/docker_images_check.py
+++ b/tests/ci/docker_images_check.py
@ -459,7 +459,7 @@ def main():
        NAME,
    )
    ch_helper = ClickHouseHelper()
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)


 if __name__ == "__main__":
--- a/tests/ci/docker_manifests_merge.py
+++ b/tests/ci/docker_manifests_merge.py
@ -234,7 +234,7 @@ def main():
        NAME,
    )
    ch_helper = ClickHouseHelper()
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)


 if __name__ == "__main__":
--- a/tests/ci/docs_check.py
+++ b/tests/ci/docs_check.py
@ -114,4 +114,4 @@ if __name__ == "__main__":
        report_url,
        NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/fast_test_check.py
+++ b/tests/ci/fast_test_check.py
@ -204,7 +204,7 @@ if __name__ == "__main__":
        report_url,
        NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)

    # Refuse other checks to run if fast test failed
    if state != "success":
--- a/tests/ci/functional_test_check.py
+++ b/tests/ci/functional_test_check.py
@ -356,7 +356,7 @@ if __name__ == "__main__":
        report_url,
        check_name_with_group,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)

    if state != "success":
        if "force-tests" in pr_info.labels:
--- a/tests/ci/integration_test_check.py
+++ b/tests/ci/integration_test_check.py
@ -279,4 +279,4 @@ if __name__ == "__main__":
        report_url,
        check_name_with_group,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/keeper_jepsen_check.py
+++ b/tests/ci/keeper_jepsen_check.py
@ -271,5 +271,5 @@ if __name__ == "__main__":
        report_url,
        CHECK_NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
    clear_autoscaling_group()
--- a/tests/ci/split_build_smoke_check.py
+++ b/tests/ci/split_build_smoke_check.py
@ -147,4 +147,4 @@ if __name__ == "__main__":
        report_url,
        CHECK_NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/stress_check.py
+++ b/tests/ci/stress_check.py
@ -176,4 +176,4 @@ if __name__ == "__main__":
        report_url,
        check_name,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/style_check.py
+++ b/tests/ci/style_check.py
@ -117,4 +117,4 @@ if __name__ == "__main__":
        report_url,
        NAME,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/ci/unit_tests_check.py
+++ b/tests/ci/unit_tests_check.py
@ -173,4 +173,4 @@ if __name__ == "__main__":
        report_url,
        check_name,
    )
-    ch_helper.insert_events_into(db="gh-data", table="checks", events=prepared_events)
+    ch_helper.insert_events_into(db="default", table="checks", events=prepared_events)
--- a/tests/integration/test_allowed_url_from_config/test.py
+++ b/tests/integration/test_allowed_url_from_config/test.py
@ -276,3 +276,8 @@ def test_HDFS(start_cluster):
    assert "not allowed" in node7.query_and_get_error(
        "SELECT * FROM hdfs('http://hdfs1:50075/webhdfs/v1/simple_storage?op=OPEN&namenoderpcaddress=hdfs1:9000&offset=0', 'TSV', 'word String')"
    )
+
+
+def test_schema_inference(start_cluster):
+    error = node7.query_and_get_error("desc url('http://test.com`, 'TSVRaw'')")
+    assert error.find("ReadWriteBufferFromHTTPBase") == -1
--- a/tests/integration/test_azure_blob_storage_zero_copy_replication/test.py
+++ b/tests/integration/test_azure_blob_storage_zero_copy_replication/test.py
@ -12,6 +12,8 @@ TABLE_NAME = "blob_storage_table"
 CONTAINER_NAME = "cont"
 CLUSTER_NAME = "test_cluster"

+drop_table_statement = f"DROP TABLE {TABLE_NAME} ON CLUSTER {CLUSTER_NAME} SYNC"
+

@pytest.fixture(scope="module")
 def cluster():
@ -55,7 +57,6 @@ def create_table(node, table_name, replica, **additional_settings):
        ORDER BY id
        SETTINGS {",".join((k+"="+repr(v) for k, v in settings.items()))}"""

-    node.query(f"DROP TABLE IF EXISTS {table_name}")
    node.query(create_table_statement)
    assert node.query(f"SELECT COUNT(*) FROM {table_name} FORMAT Values") == "(0)"

@ -104,3 +105,4 @@ def test_zero_copy_replication(cluster):
    )

    assert get_large_objects_count(blob_container_client) == 2
+    node1.query(drop_table_statement)
--- a/tests/integration/test_backup_with_other_granularity/test.py
+++ b/tests/integration/test_backup_with_other_granularity/test.py
@ -90,6 +90,9 @@ def test_backup_from_old_version(started_cluster):

    assert node1.query("CHECK TABLE dest_table") == "1\n"

+    node1.query("DROP TABLE source_table")
+    node1.query("DROP TABLE dest_table")
+

 def test_backup_from_old_version_setting(started_cluster):
    node2.query(
@ -137,6 +140,9 @@ def test_backup_from_old_version_setting(started_cluster):

    assert node2.query("CHECK TABLE dest_table") == "1\n"

+    node2.query("DROP TABLE source_table")
+    node2.query("DROP TABLE dest_table")
+

 def test_backup_from_old_version_config(started_cluster):
    node3.query(
@ -190,6 +196,9 @@ def test_backup_from_old_version_config(started_cluster):

    assert node3.query("CHECK TABLE dest_table") == "1\n"

+    node3.query("DROP TABLE source_table")
+    node3.query("DROP TABLE dest_table")
+

 def test_backup_and_alter(started_cluster):
    node4.query(
@ -223,3 +232,6 @@ def test_backup_and_alter(started_cluster):

    assert node4.query("SELECT sum(A) FROM test.backup_table") == "2\n"
    assert node4.query("SELECT B + 2 FROM test.backup_table") == "4\n"
+
+    node4.query("DROP TABLE test.backup_table")
+    node4.query("DROP DATABASE test")
--- a/tests/integration/test_distributed_respect_user_timeouts/test.py
+++ b/tests/integration/test_distributed_respect_user_timeouts/test.py
@ -94,7 +94,7 @@ def _check_exception(exception, expected_tries=3):

@pytest.fixture(scope="module", params=["configs", "configs_secure"])
 def started_cluster(request):
-    cluster = ClickHouseCluster(__file__)
+    cluster = ClickHouseCluster(__file__, request.param)
    cluster.__with_ssl_config = request.param == "configs_secure"
    main_configs = []
    main_configs += [os.path.join(request.param, "config.d/remote_servers.xml")]
--- a/tests/integration/test_multiple_disks/configs/logs_config.xml
+++ b/tests/integration/test_multiple_disks/configs/logs_config.xml
@ -14,4 +14,8 @@
        <table>part_log</table>
        <flush_interval_milliseconds>500</flush_interval_milliseconds>
    </part_log>
+    <merge_tree_metadata_cache>
+        <lru_cache_size>268435456</lru_cache_size>
+        <continue_if_corrupted>true</continue_if_corrupted>
+    </merge_tree_metadata_cache>
 </clickhouse>
--- a/tests/integration/test_multiple_disks/test.py
+++ b/tests/integration/test_multiple_disks/test.py
@ -846,14 +846,15 @@ def get_paths_for_partition_from_part_log(node, table, partition_id):


@pytest.mark.parametrize(
-    "name,engine",
+    "name,engine,use_metadata_cache",
    [
-        pytest.param("altering_mt", "MergeTree()", id="mt"),
+        pytest.param("altering_mt", "MergeTree()", "false", id="mt"),
+        pytest.param("altering_mt", "MergeTree()", "true", id="mt_use_metadata_cache"),
        # ("altering_replicated_mt","ReplicatedMergeTree('/clickhouse/altering_replicated_mt', '1')",),
        # SYSTEM STOP MERGES doesn't disable merges assignments
    ],
 )
-def test_alter_move(start_cluster, name, engine):
+def test_alter_move(start_cluster, name, engine, use_metadata_cache):
    try:
        node1.query(
            """
@ -863,9 +864,9 @@ def test_alter_move(start_cluster, name, engine):
            ) ENGINE = {engine}
            ORDER BY tuple()
            PARTITION BY toYYYYMM(EventDate)
-            SETTINGS storage_policy='jbods_with_external'
+            SETTINGS storage_policy='jbods_with_external', use_metadata_cache={use_metadata_cache}
        """.format(
-                name=name, engine=engine
+                name=name, engine=engine, use_metadata_cache=use_metadata_cache
            )
        )

@ -875,6 +876,8 @@ def test_alter_move(start_cluster, name, engine):
        node1.query("INSERT INTO {} VALUES(toDate('2019-03-16'), 66)".format(name))
        node1.query("INSERT INTO {} VALUES(toDate('2019-04-10'), 42)".format(name))
        node1.query("INSERT INTO {} VALUES(toDate('2019-04-11'), 43)".format(name))
+        assert node1.query("CHECK TABLE " + name) == "1\n"
+
        used_disks = get_used_disks_for_table(node1, name)
        assert all(
            d.startswith("jbod") for d in used_disks
@ -892,6 +895,7 @@ def test_alter_move(start_cluster, name, engine):
                name, first_part
            )
        )
+        assert node1.query("CHECK TABLE " + name) == "1\n"
        disk = node1.query(
            "SELECT disk_name FROM system.parts WHERE table = '{}' and name = '{}' and active = 1".format(
                name, first_part
@ -906,6 +910,7 @@ def test_alter_move(start_cluster, name, engine):
        node1.query(
            "ALTER TABLE {} MOVE PART '{}' TO DISK 'jbod1'".format(name, first_part)
        )
+        assert node1.query("CHECK TABLE " + name) == "1\n"
        disk = node1.query(
            "SELECT disk_name FROM system.parts WHERE table = '{}' and name = '{}' and active = 1".format(
                name, first_part
@ -920,6 +925,7 @@ def test_alter_move(start_cluster, name, engine):
        node1.query(
            "ALTER TABLE {} MOVE PARTITION 201904 TO VOLUME 'external'".format(name)
        )
+        assert node1.query("CHECK TABLE " + name) == "1\n"
        disks = (
            node1.query(
                "SELECT disk_name FROM system.parts WHERE table = '{}' and partition = '201904' and active = 1".format(
@ -938,6 +944,7 @@ def test_alter_move(start_cluster, name, engine):

        time.sleep(1)
        node1.query("ALTER TABLE {} MOVE PARTITION 201904 TO DISK 'jbod2'".format(name))
+        assert node1.query("CHECK TABLE " + name) == "1\n"
        disks = (
            node1.query(
                "SELECT disk_name FROM system.parts WHERE table = '{}' and partition = '201904' and active = 1".format(
--- a/tests/queries/0_stateless/01037_polygon_dicts_correctness_fast.sh
+++ b/tests/queries/0_stateless/01037_polygon_dicts_correctness_fast.sh
@ -18,7 +18,7 @@ DROP TABLE IF EXISTS test_01037.points;
 CREATE TABLE test_01037.points (x Float64, y Float64) ENGINE = Memory;
 "

-$CLICKHOUSE_CLIENT --query="INSERT INTO test_01037.points FORMAT TSV" --max_insert_block_size=100000 < "${CURDIR}/01037_point_data"
+$CLICKHOUSE_CLIENT --query="INSERT INTO test_01037.points FORMAT TSV" --min_chunk_bytes_for_parallel_parsing=10485760 --max_insert_block_size=100000 < "${CURDIR}/01037_point_data"

 rm "${CURDIR}"/01037_point_data

@ -34,7 +34,7 @@ CREATE TABLE test_01037.polygons_array
 ENGINE = Memory;
 "

-$CLICKHOUSE_CLIENT --query="INSERT INTO test_01037.polygons_array FORMAT JSONEachRow" --max_insert_block_size=100000 < "${CURDIR}/01037_polygon_data"
+$CLICKHOUSE_CLIENT --query="INSERT INTO test_01037.polygons_array FORMAT JSONEachRow" --min_chunk_bytes_for_parallel_parsing=10485760 --max_insert_block_size=100000 < "${CURDIR}/01037_polygon_data"

 rm "${CURDIR}"/01037_polygon_data

--- a/tests/queries/0_stateless/01161_all_system_tables.sh
+++ b/tests/queries/0_stateless/01161_all_system_tables.sh
@ -12,7 +12,7 @@ function run_selects()
 {
    thread_num=$1
    readarray -t tables_arr < <(${CLICKHOUSE_CLIENT} -q "SELECT database || '.' || name FROM system.tables
-    WHERE database in ('system', 'information_schema', 'INFORMATION_SCHEMA') and name!='zookeeper'
+    WHERE database in ('system', 'information_schema', 'INFORMATION_SCHEMA') and name!='zookeeper' and name!='merge_tree_metadata_cache' 
    AND sipHash64(name || toString($RAND)) % $THREADS = $thread_num")

    for t in "${tables_arr[@]}"
--- a/tests/queries/0_stateless/01233_check_table_with_metadata_cache.reference
+++ b/tests/queries/0_stateless/01233_check_table_with_metadata_cache.reference
@ -0,0 +1,672 @@
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:false; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:false; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:true; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:true; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:false; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:false; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:true; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Ordinary; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:true; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:false; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:false; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:true; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:false; use projection:true; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:false; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:false; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:true; use_compact_data_part:false
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+database engine:Atomic; table engine:ReplicatedMergeTree; use metadata cache:true; use projection:true; use_compact_data_part:true
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
+TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;
+CHECK TABLE test_metadata_cache.check_part_metadata_cache;
+1
--- a/tests/queries/0_stateless/01233_check_table_with_metadata_cache.sh
+++ b/tests/queries/0_stateless/01233_check_table_with_metadata_cache.sh
@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+# Tags: no-fasttest, long
+# Tag no-fasttest: setting use_metadata_cache=true is not supported in fasttest, because clickhouse binary in fasttest is build without RocksDB.
+# To suppress Warning messages from CHECK TABLE
+CLICKHOUSE_CLIENT_SERVER_LOGS_LEVEL=error
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+table_engines=(ReplicatedMergeTree)
+database_engines=(Ordinary Atomic)
+use_metadata_caches=(false true)
+use_projections=(false true)
+use_compact_data_parts=(false true)
+
+for table_engine in "${table_engines[@]}"; do
+    for database_engine in "${database_engines[@]}"; do
+        for use_metadata_cache in "${use_metadata_caches[@]}"; do
+            for use_projection in "${use_projections[@]}"; do
+                for use_compact_data_part in "${use_compact_data_parts[@]}"; do
+                    echo "database engine:${database_engine}; table engine:${table_engine}; use metadata cache:${use_metadata_cache}; use projection:${use_projection}; use_compact_data_part:${use_compact_data_part}"
+
+                    ${CLICKHOUSE_CLIENT} --query "DROP TABLE IF EXISTS test_metadata_cache.check_part_metadata_cache SYNC;"
+                    ${CLICKHOUSE_CLIENT} --query "DROP DATABASE IF EXISTS test_metadata_cache;"
+                    ${CLICKHOUSE_CLIENT} --query "CREATE DATABASE test_metadata_cache ENGINE = ${database_engine};"
+
+                    table_engine_clause=""
+                    if [[ "$table_engine" == "ReplicatedMergeTree" ]]; then
+                        table_engine_clause="ENGINE ReplicatedMergeTree('/clickhouse/tables/$CLICKHOUSE_TEST_ZOOKEEPER_PREFIX/test_metadata_cache/check_part_metadata_cache', 'r1')"
+                    elif [[ "$table_engine" == "MergeTree" ]]; then
+                        table_engine_clause="ENGINE MergeTree()"
+                    fi
+
+                    projection_clause=""
+                    if [[ "$use_projection" == "true" ]]; then
+                        projection_clause=", projection p1 (select p, sum(k), sum(v1), sum(v2) group by p)"
+                    fi
+
+                    compact_data_part_clause=", min_bytes_for_wide_part = 10485760"
+                    if [[ $use_compact_data_part == "true" ]]; then
+                        compact_data_part_clause=", min_bytes_for_wide_part = 0"
+                    fi
+                    ${CLICKHOUSE_CLIENT} --query "CREATE TABLE test_metadata_cache.check_part_metadata_cache (p Date, k UInt64, v1 UInt64, v2 Int64${projection_clause}) $table_engine_clause PARTITION BY toYYYYMM(p) ORDER BY k settings use_metadata_cache = ${use_metadata_cache} ${compact_data_part_clause}"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Insert first batch of data.
+                    ${CLICKHOUSE_CLIENT} --echo --query "INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 1, 1000, 2000), ('2018-05-16', 2, 3000, 4000), ('2018-05-17', 3, 5000, 6000), ('2018-05-18', 4, 7000, 8000);"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Insert second batch of data.
+                    ${CLICKHOUSE_CLIENT} --echo --query "INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-05-15', 5, 1000, 2000), ('2018-05-16', 6, 3000, 4000), ('2018-05-17', 7, 5000, 6000), ('2018-05-18', 8, 7000, 8000);"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # First update.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v1 = 2001  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Second update.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache update  v2 = 4002  where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # First delete.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 1 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Second delete.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache delete where k = 8 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Insert third batch of data.
+                    ${CLICKHOUSE_CLIENT} --echo --query "INSERT INTO test_metadata_cache.check_part_metadata_cache (p, k, v1, v2) VALUES ('2018-06-15', 5, 1000, 2000), ('2018-06-16', 6, 3000, 4000), ('2018-06-17', 7, 5000, 6000), ('2018-06-18', 8, 7000, 8000);"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Drop one partition.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache drop partition 201805 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Add column.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache add column v3 UInt64 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Delete column.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache drop column v3 settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Add TTL.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 10 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Modify TTL.
+                    ${CLICKHOUSE_CLIENT} --echo --query "ALTER TABLE test_metadata_cache.check_part_metadata_cache modify TTL p + INTERVAL 15 YEAR settings mutations_sync = 1, replication_alter_partitions_sync = 1;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+
+                    # Truncate table.
+                    ${CLICKHOUSE_CLIENT} --echo --query "TRUNCATE TABLE test_metadata_cache.check_part_metadata_cache;"
+                    ${CLICKHOUSE_CLIENT} --echo --query "CHECK TABLE test_metadata_cache.check_part_metadata_cache;"
+                done
+            done
+        done
+    done
+done
--- a/tests/queries/0_stateless/01825_type_json_from_map.reference
+++ b/tests/queries/0_stateless/01825_type_json_from_map.reference
@ -0,0 +1,4 @@
+800000	2000000	1400000	900000
+800000	2000000	1400000	900000
+Tuple(col0 UInt64, col1 UInt64, col2 UInt64, col3 UInt64, col4 UInt64, col5 UInt64, col6 UInt64, col7 UInt64, col8 UInt64)
+1600000	4000000	2800000	1800000
--- a/tests/queries/0_stateless/01825_type_json_from_map.sql
+++ b/tests/queries/0_stateless/01825_type_json_from_map.sql
@ -0,0 +1,41 @@
+-- Tags: no-fasttest
+
+DROP TABLE IF EXISTS t_json;
+DROP TABLE IF EXISTS t_map;
+
+SET allow_experimental_object_type = 1;
+
+CREATE TABLE t_json(id UInt64, obj JSON) ENGINE = MergeTree ORDER BY id;
+CREATE TABLE t_map(id UInt64, m Map(String, UInt64)) ENGINE = MergeTree ORDER BY id;
+
+INSERT INTO t_map
+SELECT
+    number,
+    (
+        arrayMap(x -> 'col' || toString(x), range(number % 10)),
+        range(number % 10)
+    )::Map(String, UInt64)
+FROM numbers(1000000);
+
+INSERT INTO t_json SELECT id, m FROM t_map;
+SELECT sum(m['col1']), sum(m['col4']), sum(m['col7']), sum(m['col8'] = 0) FROM t_map;
+SELECT sum(obj.col1), sum(obj.col4), sum(obj.col7), sum(obj.col8 = 0) FROM t_json;
+SELECT toTypeName(obj) FROM t_json LIMIT 1;
+
+INSERT INTO t_json
+SELECT
+    number,
+    (
+        arrayMap(x -> 'col' || toString(x), range(number % 10)),
+        range(number % 10)
+    )::Map(FixedString(4), UInt64)
+FROM numbers(1000000);
+
+SELECT sum(obj.col1), sum(obj.col4), sum(obj.col7), sum(obj.col8 = 0) FROM t_json;
+
+INSERT INTO t_json
+SELECT number, (range(number % 10), range(number % 10))::Map(UInt64, UInt64)
+FROM numbers(1000000); -- { serverError 53 }
+
+DROP TABLE IF EXISTS t_json;
+DROP TABLE IF EXISTS t_map;
--- a/tests/queries/0_stateless/01825_type_json_missed_values.reference
+++ b/tests/queries/0_stateless/01825_type_json_missed_values.reference
@ -0,0 +1,2 @@
+Tuple(foo Int8, k1 Int8, k2 Int8)
+1
--- a/tests/queries/0_stateless/01825_type_json_missed_values.sql
+++ b/tests/queries/0_stateless/01825_type_json_missed_values.sql
@ -0,0 +1,19 @@
+-- Tags: no-fasttest
+
+DROP TABLE IF EXISTS t_json;
+
+SET allow_experimental_object_type = 1;
+
+CREATE TABLE t_json(id UInt64, obj JSON)
+ENGINE = MergeTree ORDER BY id
+SETTINGS min_bytes_for_wide_part = 0;
+
+SYSTEM STOP MERGES t_json;
+
+INSERT INTO t_json SELECT number, '{"k1": 1, "k2": 2}' FROM numbers(1000000);
+INSERT INTO t_json VALUES (1000001, '{"foo": 1}');
+
+SELECT toTypeName(obj) FROM t_json LIMIT 1;
+SELECT count() FROM t_json WHERE obj.foo != 0;
+
+DROP TABLE IF EXISTS t_json;
--- a/tests/queries/0_stateless/01825_type_json_schema_inference.reference
+++ b/tests/queries/0_stateless/01825_type_json_schema_inference.reference
@ -0,0 +1,8 @@
+{"id":"1","obj":{"k1":1,"k2":{"k3":"2","k4":[{"k5":3,"k6":0},{"k5":4,"k6":0}]},"some":0},"s":"foo"}
+{"id":"2","obj":{"k1":0,"k2":{"k3":"str","k4":[{"k5":0,"k6":55}]},"some":42},"s":"bar"}
+Tuple(k1 Int8, k2 Tuple(k3 String, k4 Nested(k5 Int8, k6 Int8)), some Int8)
+{"id":"1","obj":"aaa","s":"foo"}
+{"id":"2","obj":"bbb","s":"bar"}
+{"map":{"k1":1,"k2":2},"obj":{"k1":1,"k2.k3":2},"map_type":"Map(String, Nullable(Float64))","obj_type":"Object('json')"}
+{"obj":{"k1":1,"k2":2},"map":{"k1":"1","k2":"2"}}
+Tuple(k1 Float64, k2 Float64)
--- a/tests/queries/0_stateless/01825_type_json_schema_inference.sh
+++ b/tests/queries/0_stateless/01825_type_json_schema_inference.sh
@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# Tags: no-fasttest
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+${CLICKHOUSE_CLIENT} -q "DROP TABLE IF EXISTS t_json_inference"
+
+${CLICKHOUSE_CLIENT} -q "CREATE TABLE t_json_inference (id UInt64, obj JSON, s String) \
+    ENGINE = MergeTree ORDER BY id" --allow_experimental_object_type 1
+
+user_files_path=$(clickhouse-client --query "select _path,_file from file('nonexist.txt', 'CSV', 'val1 char')" 2>&1 | grep Exception | awk '{gsub("/nonexist.txt","",$9); print $9}')
+mkdir -p ${user_files_path}/${CLICKHOUSE_TEST_UNIQUE_NAME}/
+rm -rf ${user_files_path}/${CLICKHOUSE_TEST_UNIQUE_NAME:?}/*
+
+filename="${user_files_path}/${CLICKHOUSE_TEST_UNIQUE_NAME}/data.json"
+
+echo '{"id": 1, "obj": {"k1": 1, "k2": {"k3": 2, "k4": [{"k5": 3}, {"k5": 4}]}}, "s": "foo"}' > $filename
+echo '{"id": 2, "obj": {"k2": {"k3": "str", "k4": [{"k6": 55}]}, "some": 42}, "s": "bar"}' >> $filename
+
+${CLICKHOUSE_CLIENT} -q "INSERT INTO t_json_inference SELECT * FROM file('${CLICKHOUSE_TEST_UNIQUE_NAME}/data.json', 'JSONEachRow')"
+${CLICKHOUSE_CLIENT} -q "SELECT * FROM t_json_inference FORMAT JSONEachRow" --output_format_json_named_tuples_as_objects 1
+${CLICKHOUSE_CLIENT} -q "SELECT toTypeName(obj) FROM t_json_inference LIMIT 1"
+
+${CLICKHOUSE_CLIENT} -q "DROP TABLE IF EXISTS t_json_inference"
+
+${CLICKHOUSE_CLIENT} -q "CREATE TABLE t_json_inference (id UInt64, obj String, s String) ENGINE = MergeTree ORDER BY id"
+
+echo '{"obj": "aaa", "id": 1, "s": "foo"}' > $filename
+echo '{"id": 2, "obj": "bbb", "s": "bar"}' >> $filename
+
+${CLICKHOUSE_CLIENT} -q "INSERT INTO t_json_inference SELECT * FROM file('${CLICKHOUSE_TEST_UNIQUE_NAME}/data.json', 'JSONEachRow')"
+${CLICKHOUSE_CLIENT} -q "SELECT * FROM t_json_inference FORMAT JSONEachRow" --output_format_json_named_tuples_as_objects 1
+
+${CLICKHOUSE_CLIENT} -q "DROP TABLE IF EXISTS t_json_inference"
+
+echo '{"map": {"k1": 1, "k2": 2}, "obj": {"k1": 1, "k2": {"k3": 2}}}' > $filename
+
+${CLICKHOUSE_CLIENT} -q "SELECT map, obj, toTypeName(map) AS map_type, toTypeName(obj) AS obj_type \
+    FROM file('${CLICKHOUSE_TEST_UNIQUE_NAME}/data.json', 'JSONEachRow') FORMAT JSONEachRow" --output_format_json_named_tuples_as_objects 1
+
+${CLICKHOUSE_CLIENT} -q "CREATE TABLE t_json_inference (obj JSON, map Map(String, UInt64)) \
+    ENGINE = MergeTree ORDER BY tuple()" --allow_experimental_object_type 1
+
+echo '{"map": {"k1": 1, "k2": 2}, "obj": {"k1": 1, "k2": 2}}' > $filename
+
+${CLICKHOUSE_CLIENT} -q "INSERT INTO t_json_inference SELECT * FROM file('${CLICKHOUSE_TEST_UNIQUE_NAME}/data.json', 'JSONEachRow')"
+${CLICKHOUSE_CLIENT} -q "SELECT * FROM t_json_inference FORMAT JSONEachRow" --output_format_json_named_tuples_as_objects 1
+${CLICKHOUSE_CLIENT} -q "SELECT toTypeName(obj) FROM t_json_inference LIMIT 1"
+
+${CLICKHOUSE_CLIENT} -q "DROP TABLE IF EXISTS t_json_inference"
--- a/tests/queries/0_stateless/02155_read_in_order_max_rows_to_read.reference
+++ b/tests/queries/0_stateless/02155_read_in_order_max_rows_to_read.reference
@ -0,0 +1,6 @@
+10
+0
+1
+2
+3
+4
--- a/tests/queries/0_stateless/02155_read_in_order_max_rows_to_read.sql
+++ b/tests/queries/0_stateless/02155_read_in_order_max_rows_to_read.sql
@ -0,0 +1,22 @@
+DROP TABLE IF EXISTS t_max_rows_to_read;
+
+CREATE TABLE t_max_rows_to_read (a UInt64)
+ENGINE = MergeTree ORDER BY a
+SETTINGS index_granularity = 4;
+
+INSERT INTO t_max_rows_to_read SELECT number FROM numbers(100);
+
+SET max_threads = 1;
+
+SELECT a FROM t_max_rows_to_read WHERE a = 10 SETTINGS max_rows_to_read = 4;
+
+SELECT a FROM t_max_rows_to_read ORDER BY a LIMIT 5 SETTINGS max_rows_to_read = 12;
+
+-- This should work, but actually it doesn't. Need to investigate.
+-- SELECT a FROM t_max_rows_to_read WHERE a > 10 ORDER BY a LIMIT 5 SETTINGS max_rows_to_read = 20;
+
+SELECT a FROM t_max_rows_to_read ORDER BY a LIMIT 20 FORMAT Null SETTINGS max_rows_to_read = 12; -- { serverError 158 }
+SELECT a FROM t_max_rows_to_read WHERE a > 10 ORDER BY a LIMIT 5 FORMAT Null SETTINGS max_rows_to_read = 12; -- { serverError 158 }
+SELECT a FROM t_max_rows_to_read WHERE a = 10 OR a = 20 FORMAT Null SETTINGS max_rows_to_read = 4; -- { serverError 158 }
+
+DROP TABLE t_max_rows_to_read;
--- a/tests/queries/0_stateless/02246_async_insert_quota.sh
+++ b/tests/queries/0_stateless/02246_async_insert_quota.sh
@ -16,7 +16,7 @@ ${CLICKHOUSE_CLIENT} -q "CREATE ROLE r02246"
 ${CLICKHOUSE_CLIENT} -q "CREATE USER u02246"
 ${CLICKHOUSE_CLIENT} -q "GRANT INSERT ON async_inserts_02246 TO r02246"
 ${CLICKHOUSE_CLIENT} -q "GRANT r02246 to u02246"
-${CLICKHOUSE_CLIENT} -q "CREATE QUOTA q02246 FOR INTERVAL 1 HOUR MAX QUERY INSERTS = 2 TO r02246"
+${CLICKHOUSE_CLIENT} -q "CREATE QUOTA q02246 FOR INTERVAL 100 YEAR MAX QUERY INSERTS = 2 TO r02246"

 ${CLICKHOUSE_CLIENT} --user u02246 --async_insert 1 -q "INSERT INTO async_inserts_02246 VALUES (1, 'a')"
 ${CLICKHOUSE_CLIENT} --user u02246 --async_insert 1 -q "INSERT INTO async_inserts_02246 VALUES (2, 'b')"
--- a/tests/queries/0_stateless/02246_clickhouse_local_drop_database.reference
+++ b/tests/queries/0_stateless/02246_clickhouse_local_drop_database.reference
--- a/tests/queries/0_stateless/02246_clickhouse_local_drop_database.sh
+++ b/tests/queries/0_stateless/02246_clickhouse_local_drop_database.sh
@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+dir=${CLICKHOUSE_TEST_UNIQUE_NAME}
+[[ -d $dir ]] && rm -r $dir
+mkdir $dir
+$CLICKHOUSE_LOCAL --multiline --multiquery --path $dir -q """
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE IF NOT EXISTS test;
+USE test;
+CREATE TABLE test (id Int32) ENGINE=MergeTree() ORDER BY id;
+DROP DATABASE test;
+"""
+
+$CLICKHOUSE_LOCAL --multiline --multiquery -q """
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE IF NOT EXISTS test;
+USE test;
+CREATE TABLE test (id Int32) ENGINE=MergeTree() ORDER BY id;
+DROP DATABASE test;
+"""
--- a/tests/queries/0_stateless/02246_flatten_tuple.reference
+++ b/tests/queries/0_stateless/02246_flatten_tuple.reference
@ -0,0 +1,4 @@
+([1,2],['a','b'],3,'c',4)	Tuple(`t1.a` Array(UInt32), `t1.s` Array(String), b UInt32, `t2.k` String, `t2.v` UInt32)
+Tuple(id Int8, obj Tuple(k1 Int8, k2 Tuple(k3 String, k4 Nested(k5 Int8, k6 Int8)), some Int8), s String)	Tuple(id Int8, `obj.k1` Int8, `obj.k2.k3` String, `obj.k2.k4.k5` Array(Int8), `obj.k2.k4.k6` Array(Int8), `obj.some` Int8, s String)
+1	1	2	[3,4]	[0,0]	0	foo
+2	0	str	[0]	[55]	42	bar
--- a/tests/queries/0_stateless/02246_flatten_tuple.sql
+++ b/tests/queries/0_stateless/02246_flatten_tuple.sql
@ -0,0 +1,24 @@
+-- Tags: no-fasttest
+
+DROP TABLE IF EXISTS t_flatten_tuple;
+DROP TABLE IF EXISTS t_flatten_object;
+
+SET flatten_nested = 0;
+
+CREATE TABLE t_flatten_tuple(t Tuple(t1 Nested(a UInt32, s String), b UInt32, t2 Tuple(k String, v UInt32))) ENGINE = Memory;
+
+INSERT INTO t_flatten_tuple VALUES (([(1, 'a'), (2, 'b')], 3, ('c', 4)));
+
+SELECT flattenTuple(t) AS ft, toTypeName(ft) FROM t_flatten_tuple;
+
+SET allow_experimental_object_type = 1;
+CREATE TABLE t_flatten_object(data JSON) ENGINE = Memory;
+
+INSERT INTO t_flatten_object VALUES ('{"id": 1, "obj": {"k1": 1, "k2": {"k3": 2, "k4": [{"k5": 3}, {"k5": 4}]}}, "s": "foo"}');
+INSERT INTO t_flatten_object VALUES ('{"id": 2, "obj": {"k2": {"k3": "str", "k4": [{"k6": 55}]}, "some": 42}, "s": "bar"}');
+
+SELECT toTypeName(data), toTypeName(flattenTuple(data)) FROM t_flatten_object LIMIT 1;
+SELECT untuple(flattenTuple(data)) FROM t_flatten_object ORDER BY data.id;
+
+DROP TABLE IF EXISTS t_flatten_tuple;
+DROP TABLE IF EXISTS t_flatten_object;