Merge branch 'master' into async-reads

docker/test/integration/runner/Dockerfile

@@ -98,6 +98,8 @@ RUN set -x \
   && echo 'dockremap:165536:65536' >> /etc/subuid \
     && echo 'dockremap:165536:65536' >> /etc/subgid
 
+RUN echo '127.0.0.1 localhost test.com' >> /etc/hosts
+
 EXPOSE 2375
 ENTRYPOINT ["dockerd-entrypoint.sh"]
 CMD ["sh", "-c", "pytest $PYTEST_OPTS"]

docker/test/integration/runner/compose/docker_compose_nginx.yml

@@ -0,0 +1,11 @@
+version: '2.3'
+services:
+    # nginx server to host static files.
+    # Accepts only PUT data by test.com/path and GET already existing data on test.com/path.
+    # Files will be put into /usr/share/nginx/files.
+
+    nginx:
+        image: kssenii/nginx-test:1.1
+        restart: always
+        ports:
+            - 80:80

docker/test/stress/run.sh

@@ -58,7 +58,7 @@ function start()
             echo "Cannot start clickhouse-server"
             cat /var/log/clickhouse-server/stdout.log
             tail -n1000 /var/log/clickhouse-server/stderr.log
-            tail -n100000 /var/log/clickhouse-server/clickhouse-server.log | grep -F -v '<Warning> RaftInstance:' -e '<Information> RaftInstance' | tail -n1000
+            tail -n100000 /var/log/clickhouse-server/clickhouse-server.log | grep -F -v -e '<Warning> RaftInstance:' -e '<Information> RaftInstance' | tail -n1000
             break
         fi
         # use root to match with current uid

docs/en/interfaces/mysql.md

@@ -44,4 +44,10 @@ Restrictions:
 
 -   some data types are sent as strings
 
+To cancel a long query use `KILL QUERY connection_id` statement (it is replaced with `KILL QUERY WHERE query_id = connection_id` while proceeding). For example:
+
+``` bash
+$ mysql --protocol tcp -h mysql_server -P 9004 default -u default --password=123 -e "KILL QUERY 123456;"
+```
+
 [Original article](https://clickhouse.tech/docs/en/interfaces/mysql/) <!--hide-->

docs/en/sql-reference/functions/other-functions.md

@@ -2236,6 +2236,53 @@ defaultRoles()
 
 Type: [Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md)).
 
+## getServerPort {#getserverport}
+
+Returns the number of the server port. When the port is not used by the server, throws an exception.
+
+**Syntax**
+
+``` sql
+getServerPort(port_name)
+```
+
+**Arguments**
+
+-   `port_name` — The name of the server port. [String](../../sql-reference/data-types/string.md#string). Possible values:
+
+    -   'tcp_port'
+    -   'tcp_port_secure'
+    -   'http_port'
+    -   'https_port'
+    -   'interserver_http_port'
+    -   'interserver_https_port'
+    -   'mysql_port'
+    -   'postgresql_port'
+    -   'grpc_port'
+    -   'prometheus.port'
+
+**Returned value**
+
+-   The number of the server port.
+
+Type: [UInt16](../../sql-reference/data-types/int-uint.md).
+
+**Example**
+
+Query:
+
+``` sql
+SELECT getServerPort('tcp_port');
+```
+
+Result:
+
+``` text
+┌─getServerPort('tcp_port')─┐
+│ 9000                      │
+└───────────────────────────┘
+```
+
 ## queryID {#query-id}
 
 Returns the ID of the current query. Other parameters of a query can be extracted from the [system.query_log](../../operations/system-tables/query_log.md) table via `query_id`.

docs/ru/interfaces/mysql.md

@@ -43,3 +43,9 @@ mysql>
 -   не поддерживаются подготовленные запросы
 
 -   некоторые типы данных отправляются как строки
+
+Чтобы прервать долго выполняемый запрос, используйте запрос `KILL QUERY connection_id` (во время выполнения он будет заменен на `KILL QUERY WHERE query_id = connection_id`). Например:
+
+``` bash
+$ mysql --protocol tcp -h mysql_server -P 9004 default -u default --password=123 -e "KILL QUERY 123456;"
+```

docs/ru/sql-reference/functions/other-functions.md

@@ -2186,6 +2186,53 @@ defaultRoles()
 
 Тип: [Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md)).
 
+## getServerPort {#getserverport}
+
+Возвращает номер порта сервера. Если порт не используется сервером, генерируется исключение.
+
+**Синтаксис**
+
+``` sql
+getServerPort(port_name)
+```
+
+**Аргументы**
+
+-   `port_name` — имя порта сервера. [String](../../sql-reference/data-types/string.md#string). Возможные значения:
+
+    -   'tcp_port'
+    -   'tcp_port_secure'
+    -   'http_port'
+    -   'https_port'
+    -   'interserver_http_port'
+    -   'interserver_https_port'
+    -   'mysql_port'
+    -   'postgresql_port'
+    -   'grpc_port'
+    -   'prometheus.port'
+
+**Возвращаемое значение**
+
+-   Номер порта сервера.
+
+Тип: [UInt16](../../sql-reference/data-types/int-uint.md).
+
+**Пример**
+
+Запрос:
+
+``` sql
+SELECT getServerPort('tcp_port');
+```
+
+Результат:
+
+``` text
+┌─getServerPort('tcp_port')─┐
+│ 9000                      │
+└───────────────────────────┘
+```
+
 ## queryID {#query-id}
 
 Возвращает идентификатор текущего запроса. Другие параметры запроса могут быть извлечены из системной таблицы [system.query_log](../../operations/system-tables/query_log.md) через `query_id`.

programs/CMakeLists.txt

@@ -45,9 +45,9 @@ option (ENABLE_CLICKHOUSE_LIBRARY_BRIDGE "HTTP-server working like a proxy to Li
     ${ENABLE_CLICKHOUSE_ALL})
 
 # https://presentations.clickhouse.tech/matemarketing_2020/
-option (ENABLE_CLICKHOUSE_GIT_IMPORT "A tool to analyze Git repositories"
+option (ENABLE_CLICKHOUSE_GIT_IMPORT "A tool to analyze Git repositories" ${ENABLE_CLICKHOUSE_ALL})
-    ${ENABLE_CLICKHOUSE_ALL})
 
+option (ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER "A tool to export table data files to be later put to a static files web server" ${ENABLE_CLICKHOUSE_ALL})
 
 option (ENABLE_CLICKHOUSE_KEEPER "ClickHouse alternative to ZooKeeper" ${ENABLE_CLICKHOUSE_ALL})
 
@@ -227,6 +227,7 @@ add_subdirectory (obfuscator)
 add_subdirectory (install)
 add_subdirectory (git-import)
 add_subdirectory (bash-completion)
+add_subdirectory (static-files-disk-uploader)
 
 if (ENABLE_CLICKHOUSE_KEEPER)
     add_subdirectory (keeper)
@@ -258,7 +259,8 @@ if (CLICKHOUSE_ONE_SHARED)
     ${CLICKHOUSE_GIT_IMPORT_SOURCES}
     ${CLICKHOUSE_ODBC_BRIDGE_SOURCES}
     ${CLICKHOUSE_KEEPER_SOURCES}
-    ${CLICKHOUSE_KEEPER_CONVERTER_SOURCES})
+    ${CLICKHOUSE_KEEPER_CONVERTER_SOURCES}
+    ${CLICKHOUSE_STATIC_FILES_DISK_UPLOADER_SOURCES})
 
     target_link_libraries(clickhouse-lib
       ${CLICKHOUSE_SERVER_LINK}
@@ -273,7 +275,8 @@ if (CLICKHOUSE_ONE_SHARED)
       ${CLICKHOUSE_GIT_IMPORT_LINK}
       ${CLICKHOUSE_ODBC_BRIDGE_LINK}
       ${CLICKHOUSE_KEEPER_LINK}
-      ${CLICKHOUSE_KEEPER_CONVERTER_LINK})
+      ${CLICKHOUSE_KEEPER_CONVERTER_LINK}
+      ${CLICKHOUSE_STATIC_FILES_DISK_UPLOADER_LINK})
 
     target_include_directories(clickhouse-lib
       ${CLICKHOUSE_SERVER_INCLUDE}
@@ -306,6 +309,7 @@ if (CLICKHOUSE_SPLIT_BINARY)
         clickhouse-obfuscator
         clickhouse-git-import
         clickhouse-copier
+        clickhouse-static-files-disk-uploader
     )
 
     if (ENABLE_CLICKHOUSE_ODBC_BRIDGE)
@@ -371,6 +375,9 @@ else ()
     if (ENABLE_CLICKHOUSE_GIT_IMPORT)
         clickhouse_target_link_split_lib(clickhouse git-import)
     endif ()
+    if (ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER)
+        clickhouse_target_link_split_lib(clickhouse static-files-disk-uploader)
+    endif ()
     if (ENABLE_CLICKHOUSE_KEEPER)
         clickhouse_target_link_split_lib(clickhouse keeper)
     endif()
@@ -432,6 +439,11 @@ else ()
         install (FILES "${CMAKE_CURRENT_BINARY_DIR}/clickhouse-git-import" DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT clickhouse)
         list(APPEND CLICKHOUSE_BUNDLE clickhouse-git-import)
     endif ()
+    if (ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER)
+        add_custom_target (clickhouse-static-files-disk-uploader ALL COMMAND ${CMAKE_COMMAND} -E create_symlink clickhouse clickhouse-static-files-disk-uploader DEPENDS clickhouse)
+        install (FILES "${CMAKE_CURRENT_BINARY_DIR}/clickhouse-static-files-disk-uploader" DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT clickhouse)
+        list(APPEND CLICKHOUSE_BUNDLE clickhouse-static-files-disk-uploader)
+    endif ()
     if (ENABLE_CLICKHOUSE_KEEPER)
         add_custom_target (clickhouse-keeper ALL COMMAND ${CMAKE_COMMAND} -E create_symlink clickhouse clickhouse-keeper DEPENDS clickhouse)
         install (FILES "${CMAKE_CURRENT_BINARY_DIR}/clickhouse-keeper" DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT clickhouse)

programs/config_tools.h.in

@@ -18,3 +18,4 @@
 #cmakedefine01 ENABLE_CLICKHOUSE_LIBRARY_BRIDGE
 #cmakedefine01 ENABLE_CLICKHOUSE_KEEPER
 #cmakedefine01 ENABLE_CLICKHOUSE_KEEPER_CONVERTER
+#cmakedefine01 ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER

programs/main.cpp

@@ -62,6 +62,9 @@ int mainEntryClickHouseKeeper(int argc, char ** argv);
 #if ENABLE_CLICKHOUSE_KEEPER
 int mainEntryClickHouseKeeperConverter(int argc, char ** argv);
 #endif
+#if ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER
+int mainEntryClickHouseStaticFilesDiskUploader(int argc, char ** argv);
+#endif
 #if ENABLE_CLICKHOUSE_INSTALL
 int mainEntryClickHouseInstall(int argc, char ** argv);
 int mainEntryClickHouseStart(int argc, char ** argv);
@@ -131,6 +134,9 @@ std::pair<const char *, MainFunc> clickhouse_applications[] =
     {"stop", mainEntryClickHouseStop},
     {"status", mainEntryClickHouseStatus},
     {"restart", mainEntryClickHouseRestart},
+#endif
+#if ENABLE_CLICKHOUSE_STATIC_FILES_DISK_UPLOADER
+    {"static-files-disk-uploader", mainEntryClickHouseStaticFilesDiskUploader},
 #endif
     {"hash-binary", mainEntryClickHouseHashBinary},
 };

programs/static-files-disk-uploader/CMakeLists.txt

@@ -0,0 +1,9 @@
+set (CLICKHOUSE_STATIC_FILES_DISK_UPLOADER_SOURCES static-files-disk-uploader.cpp)
+
+set (CLICKHOUSE_STATIC_FILES_DISK_UPLOADER_LINK
+    PRIVATE
+        boost::program_options
+        dbms
+)
+
+clickhouse_program_add(static-files-disk-uploader)

programs/static-files-disk-uploader/clickhouse-static-files-disk-uploader.cpp

@@ -0,0 +1,2 @@
+int mainEntryClickHouseStaticFilesDiskUploader(int argc, char ** argv);
+int main(int argc_, char ** argv_) { return mainEntryClickHouseStaticFilesDiskUploader(argc_, argv_); }

programs/static-files-disk-uploader/static-files-disk-uploader.cpp

@@ -0,0 +1,162 @@
+#include <Common/Exception.h>
+#include <Common/TerminalSize.h>
+
+#include <IO/ReadHelpers.h>
+#include <IO/ReadBufferFromFile.h>
+#include <IO/WriteHelpers.h>
+#include <IO/WriteBufferFromHTTP.h>
+#include <IO/WriteBufferFromFile.h>
+#include <IO/copyData.h>
+#include <IO/createReadBufferFromFileBase.h>
+
+#include <boost/program_options.hpp>
+#include <re2/re2.h>
+#include <filesystem>
+
+namespace fs = std::filesystem;
+
+#define UUID_PATTERN "[\\w]{8}-[\\w]{4}-[\\w]{4}-[\\w]{4}-[\\w]{12}"
+#define EXTRACT_UUID_PATTERN fmt::format(".*/({})/.*", UUID_PATTERN)
+
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int BAD_ARGUMENTS;
+}
+
+/*
+ * A tool to collect table data files on local fs as is (into current directory or into path from --output-dir option).
+ * If test-mode option is added, files will be put by given url via PUT request.
+ */
+
+void processTableFiles(const fs::path & path, const String & files_prefix, String uuid,
+        WriteBuffer & metadata_buf, std::function<std::shared_ptr<WriteBuffer>(const String &)> create_dst_buf)
+{
+    fs::directory_iterator dir_end;
+    auto process_file = [&](const String & file_name, const String & file_path)
+    {
+        auto remote_file_name = files_prefix + "-" + uuid + "-" + file_name;
+        writeText(remote_file_name, metadata_buf);
+        writeChar('\t', metadata_buf);
+        writeIntText(fs::file_size(file_path), metadata_buf);
+        writeChar('\n', metadata_buf);
+
+        auto src_buf = createReadBufferFromFileBase(file_path, {}, fs::file_size(file_path));
+        auto dst_buf = create_dst_buf(remote_file_name);
+
+        copyData(*src_buf, *dst_buf);
+        dst_buf->next();
+        dst_buf->finalize();
+    };
+
+    for (fs::directory_iterator dir_it(path); dir_it != dir_end; ++dir_it)
+    {
+        if (dir_it->is_directory())
+        {
+            fs::directory_iterator files_end;
+            for (fs::directory_iterator file_it(dir_it->path()); file_it != files_end; ++file_it)
+                process_file(dir_it->path().filename().string() + "-" + file_it->path().filename().string(), file_it->path());
+        }
+        else
+        {
+            process_file(dir_it->path().filename(), dir_it->path());
+        }
+    }
+}
+}
+
+int mainEntryClickHouseStaticFilesDiskUploader(int argc, char ** argv)
+try
+{
+    using namespace DB;
+    namespace po = boost::program_options;
+
+    po::options_description description("Allowed options", getTerminalWidth());
+    description.add_options()
+        ("help,h", "produce help message")
+        ("metadata-path", po::value<std::string>(), "Metadata path (select data_paths from system.tables where name='table_name'")
+        ("test-mode", "Use test mode, which will put data on given url via PUT")
+        ("url", po::value<std::string>(), "Web server url for test mode")
+        ("output-dir", po::value<std::string>(), "Directory to put files in non-test mode")
+        ("files-prefix", po::value<std::string>(), "Prefix for stored files");
+
+    po::parsed_options parsed = po::command_line_parser(argc, argv).options(description).run();
+    po::variables_map options;
+    po::store(parsed, options);
+    po::notify(options);
+
+    if (options.empty() || options.count("help"))
+    {
+        std::cout << description << std::endl;
+        exit(0);
+    }
+
+    String url, metadata_path, files_prefix;
+
+    if (options.count("metadata-path"))
+        metadata_path = options["metadata-path"].as<std::string>();
+    else
+        throw Exception(ErrorCodes::BAD_ARGUMENTS, "No metadata-path option passed");
+
+    if (options.count("files-prefix"))
+        files_prefix = options["files-prefix"].as<std::string>();
+    else
+        throw Exception(ErrorCodes::BAD_ARGUMENTS, "No files-prefix option passed");
+
+    fs::path fs_path = fs::weakly_canonical(metadata_path);
+    if (!fs::exists(fs_path))
+    {
+        std::cerr << fmt::format("Data path ({}) does not exist", fs_path.string());
+        return 1;
+    }
+
+    String uuid;
+    if (!RE2::Extract(metadata_path, EXTRACT_UUID_PATTERN, "\\1", &uuid))
+        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Cannot extract uuid for: {}", metadata_path);
+
+    std::shared_ptr<WriteBuffer> metadata_buf;
+    std::function<std::shared_ptr<WriteBuffer>(const String &)> create_dst_buf;
+    String root_path;
+
+    if (options.count("test-mode"))
+    {
+        if (options.count("url"))
+            url = options["url"].as<std::string>();
+        else
+            throw Exception(ErrorCodes::BAD_ARGUMENTS, "No url option passed for test mode");
+
+        metadata_buf = std::make_shared<WriteBufferFromHTTP>(Poco::URI(fs::path(url) / (".index-" + uuid)), Poco::Net::HTTPRequest::HTTP_PUT);
+
+        create_dst_buf = [&](const String & remote_file_name)
+        {
+            return std::make_shared<WriteBufferFromHTTP>(Poco::URI(fs::path(url) / remote_file_name), Poco::Net::HTTPRequest::HTTP_PUT);
+        };
+    }
+    else
+    {
+        if (options.count("output-dir"))
+            root_path = options["output-dir"].as<std::string>();
+        else
+            root_path = fs::current_path();
+
+        metadata_buf = std::make_shared<WriteBufferFromFile>(fs::path(root_path) / (".index-" + uuid));
+        create_dst_buf = [&](const String & remote_file_name)
+        {
+            return std::make_shared<WriteBufferFromFile>(fs::path(root_path) / remote_file_name);
+        };
+    }
+
+    processTableFiles(fs_path, files_prefix, uuid, *metadata_buf, create_dst_buf);
+    metadata_buf->next();
+    metadata_buf->finalize();
+
+    return 0;
+}
+catch (...)
+{
+    std::cerr << DB::getCurrentExceptionMessage(false);
+    return 1;
+}

programs/ya.make

@@ -23,6 +23,7 @@ SRCS(
     client/QueryFuzzer.cpp
     client/ConnectionParameters.cpp
     client/Suggest.cpp
+    client/TestHint.cpp
     extract-from-config/ExtractFromConfig.cpp
     server/Server.cpp
     server/MetricsTransmitter.cpp

src/Access/ya.make.in

@@ -8,7 +8,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/AggregateFunctions/AggregateFunctionSequenceMatch.h

@@ -48,6 +48,8 @@ struct AggregateFunctionSequenceMatchData final
 
     bool sorted = true;
     PODArrayWithStackMemory<TimestampEvents, 64> events_list;
+    /// sequenceMatch conditions met at least once in events_list
+    std::bitset<max_events> conditions_met;
 
     void add(const Timestamp timestamp, const Events & events)
     {
@@ -56,6 +58,7 @@ struct AggregateFunctionSequenceMatchData final
         {
             events_list.emplace_back(timestamp, events);
             sorted = false;
+            conditions_met |= events;
         }
     }
 
@@ -64,29 +67,9 @@ struct AggregateFunctionSequenceMatchData final
         if (other.events_list.empty())
             return;
 
-        const auto size = events_list.size();
-
         events_list.insert(std::begin(other.events_list), std::end(other.events_list));
-
+        sorted = false;
-        /// either sort whole container or do so partially merging ranges afterwards
+        conditions_met |= other.conditions_met;
-        if (!sorted && !other.sorted)
-            std::sort(std::begin(events_list), std::end(events_list), Comparator{});
-        else
-        {
-            const auto begin = std::begin(events_list);
-            const auto middle = std::next(begin, size);
-            const auto end = std::end(events_list);
-
-            if (!sorted)
-                std::sort(begin, middle, Comparator{});
-
-            if (!other.sorted)
-                std::sort(middle, end, Comparator{});
-
-            std::inplace_merge(begin, middle, end, Comparator{});
-        }
-
-        sorted = true;
     }
 
     void sort()
@@ -290,6 +273,7 @@ private:
                     dfa_states.back().transition = DFATransition::SpecificEvent;
                     dfa_states.back().event = event_number - 1;
                     dfa_states.emplace_back();
+                    conditions_in_pattern.set(event_number - 1);
                 }
 
                 if (!match(")"))
@@ -518,6 +502,64 @@ protected:
         return action_it == action_end;
     }
 
+    /// Splits the pattern into deterministic parts separated by non-deterministic fragments
+    /// (time constraints and Kleene stars), and tries to match the deterministic parts in their specified order,
+    /// ignoring the non-deterministic fragments.
+    /// This function can quickly check that a full match is not possible if some deterministic fragment is missing.
+    template <typename EventEntry>
+    bool couldMatchDeterministicParts(const EventEntry events_begin, const EventEntry events_end, bool limit_iterations = true) const
+    {
+        size_t events_processed = 0;
+        auto events_it = events_begin;
+
+        const auto actions_end = std::end(actions);
+        auto actions_it = std::begin(actions);
+        auto det_part_begin = actions_it;
+
+        auto match_deterministic_part = [&events_it, events_end, &events_processed, det_part_begin, actions_it, limit_iterations]()
+        {
+            auto events_it_init = events_it;
+            auto det_part_it = det_part_begin;
+
+            while (det_part_it != actions_it && events_it != events_end)
+            {
+                /// matching any event
+                if (det_part_it->type == PatternActionType::AnyEvent)
+                    ++events_it, ++det_part_it;
+
+                /// matching specific event
+                else
+                {
+                    if (events_it->second.test(det_part_it->extra))
+                        ++events_it, ++det_part_it;
+
+                    /// abandon current matching, try to match the deterministic fragment further in the list
+                    else
+                    {
+                        events_it = ++events_it_init;
+                        det_part_it = det_part_begin;
+                    }
+                }
+
+                if (limit_iterations && ++events_processed > sequence_match_max_iterations)
+                    throw Exception{"Pattern application proves too difficult, exceeding max iterations (" + toString(sequence_match_max_iterations) + ")",
+                        ErrorCodes::TOO_SLOW};
+            }
+
+            return det_part_it == actions_it;
+        };
+
+        for (; actions_it != actions_end; ++actions_it)
+            if (actions_it->type != PatternActionType::SpecificEvent && actions_it->type != PatternActionType::AnyEvent)
+            {
+                if (!match_deterministic_part())
+                    return false;
+                det_part_begin = std::next(actions_it);
+            }
+
+        return match_deterministic_part();
+    }
+
 private:
     enum class DFATransition : char
     {
@@ -558,6 +600,8 @@ private:
 protected:
     /// `True` if the parsed pattern contains time assertions (?t...), `false` otherwise.
     bool pattern_has_time;
+    /// sequenceMatch conditions met at least once in the pattern
+    std::bitset<max_events> conditions_in_pattern;
 
 private:
     std::string pattern;
@@ -584,6 +628,12 @@ public:
 
     void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override
     {
+        auto & output = assert_cast<ColumnUInt8 &>(to).getData();
+        if ((this->conditions_in_pattern & this->data(place).conditions_met) != this->conditions_in_pattern)
+        {
+            output.push_back(false);
+            return;
+        }
         this->data(place).sort();
 
         const auto & data_ref = this->data(place);
@@ -592,8 +642,10 @@ public:
         const auto events_end = std::end(data_ref.events_list);
         auto events_it = events_begin;
 
-        bool match = this->pattern_has_time ? this->backtrackingMatch(events_it, events_end) : this->dfaMatch(events_it, events_end);
+        bool match = (this->pattern_has_time ?
-        assert_cast<ColumnUInt8 &>(to).getData().push_back(match);
+            (this->couldMatchDeterministicParts(events_begin, events_end) && this->backtrackingMatch(events_it, events_end)) :
+            this->dfaMatch(events_it, events_end));
+        output.push_back(match);
     }
 };
 
@@ -614,8 +666,14 @@ public:
 
     void insertResultInto(AggregateDataPtr __restrict place, IColumn & to, Arena *) const override
     {
+        auto & output = assert_cast<ColumnUInt64 &>(to).getData();
+        if ((this->conditions_in_pattern & this->data(place).conditions_met) != this->conditions_in_pattern)
+        {
+            output.push_back(0);
+            return;
+        }
         this->data(place).sort();
-        assert_cast<ColumnUInt64 &>(to).getData().push_back(count(place));
+        output.push_back(count(place));
     }
 
 private:
@@ -628,8 +686,12 @@ private:
         auto events_it = events_begin;
 
         size_t count = 0;
+        // check if there is a chance of matching the sequence at least once
+        if (this->couldMatchDeterministicParts(events_begin, events_end))
+        {
             while (events_it != events_end && this->backtrackingMatch(events_it, events_end))
                 ++count;
+        }
 
         return count;
     }

src/AggregateFunctions/ya.make

@@ -48,6 +48,7 @@ SRCS(
     AggregateFunctionSequenceNextNode.cpp
     AggregateFunctionSimpleLinearRegression.cpp
     AggregateFunctionSimpleState.cpp
+    AggregateFunctionSingleValueOrNull.cpp
     AggregateFunctionState.cpp
     AggregateFunctionStatistics.cpp
     AggregateFunctionStatisticsSimple.cpp

src/AggregateFunctions/ya.make.in

@@ -8,7 +8,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F GroupBitmap | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | grep -v -F GroupBitmap | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Backups/ya.make

@@ -0,0 +1,27 @@
+# This file is generated automatically, do not edit. See 'ya.make.in' and use 'utils/generate-ya-make' to regenerate it.
+OWNER(g:clickhouse)
+
+LIBRARY()
+
+PEERDIR(
+    clickhouse/src/Common
+)
+
+
+SRCS(
+    BackupEntryConcat.cpp
+    BackupEntryFromAppendOnlyFile.cpp
+    BackupEntryFromImmutableFile.cpp
+    BackupEntryFromMemory.cpp
+    BackupEntryFromSmallFile.cpp
+    BackupFactory.cpp
+    BackupInDirectory.cpp
+    BackupRenamingConfig.cpp
+    BackupSettings.cpp
+    BackupUtils.cpp
+    hasCompatibleDataToRestoreTable.cpp
+    renameInCreateQuery.cpp
+
+)
+
+END()

src/Backups/ya.make.in

@@ -0,0 +1,14 @@
+OWNER(g:clickhouse)
+
+LIBRARY()
+
+PEERDIR(
+    clickhouse/src/Common
+)
+
+
+SRCS(
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
+)
+
+END()

src/Bridge/ya.make.in

@@ -8,7 +8,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Client/ya.make.in

@@ -9,7 +9,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Columns/ya.make.in

@@ -17,7 +17,7 @@ PEERDIR(
 )
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Common/ConcurrentBoundedQueue.h

@@ -2,11 +2,21 @@
 
 #include <queue>
 #include <type_traits>
+#include <atomic>
 
 #include <Poco/Mutex.h>
 #include <Poco/Semaphore.h>
 
 #include <common/MoveOrCopyIfThrow.h>
+#include <Common/Exception.h>
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int LOGICAL_ERROR;
+}
+}
 
 /** A very simple thread-safe queue of limited size.
   * If you try to pop an item from an empty queue, the thread is blocked until the queue becomes nonempty.
@@ -17,9 +27,41 @@ class ConcurrentBoundedQueue
 {
 private:
     std::queue<T> queue;
-    Poco::FastMutex mutex;
+    mutable Poco::FastMutex mutex;
     Poco::Semaphore fill_count;
     Poco::Semaphore empty_count;
+    std::atomic_bool closed = false;
+
+    template <typename... Args>
+    bool tryEmplaceImpl(Args &&... args)
+    {
+        bool emplaced = true;
+
+        {
+            Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+            if (closed)
+                emplaced = false;
+            else
+                queue.emplace(std::forward<Args>(args)...);
+        }
+
+        if (emplaced)
+            fill_count.set();
+        else
+            empty_count.set();
+
+        return emplaced;
+    }
+
+    void popImpl(T & x)
+    {
+        {
+            Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+            detail::moveOrCopyIfThrow(std::move(queue.front()), x);
+            queue.pop();
+        }
+        empty_count.set();
+    }
 
 public:
     explicit ConcurrentBoundedQueue(size_t max_fill)
@@ -30,91 +72,75 @@ public:
     void push(const T & x)
     {
         empty_count.wait();
-        {
+        if (!tryEmplaceImpl(x))
-            Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+            throw DB::Exception(DB::ErrorCodes::LOGICAL_ERROR, "tryPush/tryEmplace must be used with close()");
-            queue.push(x);
-        }
-        fill_count.set();
     }
 
     template <typename... Args>
     void emplace(Args &&... args)
     {
         empty_count.wait();
-        {
+        if (!tryEmplaceImpl(std::forward<Args>(args)...))
-            Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+            throw DB::Exception(DB::ErrorCodes::LOGICAL_ERROR, "tryPush/tryEmplace must be used with close()");
-            queue.emplace(std::forward<Args>(args)...);
-        }
-        fill_count.set();
     }
 
     void pop(T & x)
     {
         fill_count.wait();
-        {
+        popImpl(x);
-            Poco::ScopedLock<Poco::FastMutex> lock(mutex);
-            detail::moveOrCopyIfThrow(std::move(queue.front()), x);
-            queue.pop();
-        }
-        empty_count.set();
     }
 
     bool tryPush(const T & x, UInt64 milliseconds = 0)
     {
-        if (empty_count.tryWait(milliseconds))
+        if (!empty_count.tryWait(milliseconds))
-        {
-            {
-                Poco::ScopedLock<Poco::FastMutex> lock(mutex);
-                queue.push(x);
-            }
-            fill_count.set();
-            return true;
-        }
             return false;
+
+        return tryEmplaceImpl(x);
     }
 
     template <typename... Args>
     bool tryEmplace(UInt64 milliseconds, Args &&... args)
     {
-        if (empty_count.tryWait(milliseconds))
+        if (!empty_count.tryWait(milliseconds))
-        {
-            {
-                Poco::ScopedLock<Poco::FastMutex> lock(mutex);
-                queue.emplace(std::forward<Args>(args)...);
-            }
-            fill_count.set();
-            return true;
-        }
             return false;
+
+        return tryEmplaceImpl(std::forward<Args>(args)...);
     }
 
     bool tryPop(T & x, UInt64 milliseconds = 0)
     {
-        if (fill_count.tryWait(milliseconds))
+        if (!fill_count.tryWait(milliseconds))
-        {
+            return false;
-            {
+
-                Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+        popImpl(x);
-                detail::moveOrCopyIfThrow(std::move(queue.front()), x);
-                queue.pop();
-            }
-            empty_count.set();
         return true;
     }
-        return false;
-    }
 
-    size_t size()
+    size_t size() const
     {
         Poco::ScopedLock<Poco::FastMutex> lock(mutex);
         return queue.size();
     }
 
-    size_t empty()
+    size_t empty() const
     {
         Poco::ScopedLock<Poco::FastMutex> lock(mutex);
         return queue.empty();
     }
 
+    /// Forbids to push new elements to queue.
+    /// Returns false if queue was not closed before call, returns true if queue was already closed.
+    bool close()
+    {
+        Poco::ScopedLock<Poco::FastMutex> lock(mutex);
+        return closed.exchange(true);
+    }
+
+    bool isClosed() const
+    {
+        return closed.load();
+    }
+
     void clear()
     {
         while (fill_count.tryWait(0))

src/Common/ZooKeeper/ZooKeeperImpl.cpp

@@ -540,7 +540,7 @@ void ZooKeeper::sendThread()
 
     try
     {
-        while (!expired)
+        while (!requests_queue.isClosed())
         {
             auto prev_bytes_sent = out->count();
 
@@ -572,7 +572,7 @@ void ZooKeeper::sendThread()
                         info.request->has_watch = true;
                     }
 
-                    if (expired)
+                    if (requests_queue.isClosed())
                     {
                         break;
                     }
@@ -617,7 +617,7 @@ void ZooKeeper::receiveThread()
     try
     {
         Int64 waited = 0;
-        while (!expired)
+        while (!requests_queue.isClosed())
         {
             auto prev_bytes_received = in->count();
 
@@ -640,7 +640,7 @@ void ZooKeeper::receiveThread()
 
             if (in->poll(max_wait))
             {
-                if (expired)
+                if (requests_queue.isClosed())
                     break;
 
                 receiveEvent();
@@ -840,12 +840,10 @@ void ZooKeeper::finalize(bool error_send, bool error_receive)
 
     auto expire_session_if_not_expired = [&]
     {
-        std::lock_guard lock(push_request_mutex);
+        /// No new requests will appear in queue after close()
-        if (!expired)
+        bool was_already_closed = requests_queue.close();
-        {
+        if (!was_already_closed)
-            expired = true;
             active_session_metric_increment.destroy();
-        }
     };
 
     try
@@ -1018,18 +1016,16 @@ void ZooKeeper::pushRequest(RequestInfo && info)
             }
         }
 
-        /// We must serialize 'pushRequest' and 'finalize' (from sendThread, receiveThread) calls
+        if (requests_queue.isClosed())
-        ///  to avoid forgotten operations in the queue when session is expired.
-        /// Invariant: when expired, no new operations will be pushed to the queue in 'pushRequest'
-        ///  and the queue will be drained in 'finalize'.
-        std::lock_guard lock(push_request_mutex);
-
-        if (expired)
             throw Exception("Session expired", Error::ZSESSIONEXPIRED);
 
         if (!requests_queue.tryPush(std::move(info), operation_timeout.totalMilliseconds()))
+        {
+            if (requests_queue.isClosed())
+                throw Exception("Session expired", Error::ZSESSIONEXPIRED);
             throw Exception("Cannot push request to queue within operation timeout", Error::ZOPERATIONTIMEOUT);
         }
+    }
     catch (...)
     {
         finalize(false, false);

src/Common/ZooKeeper/ZooKeeperImpl.h

@@ -121,7 +121,7 @@ public:
 
 
     /// If expired, you can only destroy the object. All other methods will throw exception.
-    bool isExpired() const override { return expired; }
+    bool isExpired() const override { return requests_queue.isClosed(); }
 
     /// Useful to check owner of ephemeral node.
     int64_t getSessionID() const override { return session_id; }
@@ -207,11 +207,9 @@ private:
     int64_t session_id = 0;
 
     std::atomic<XID> next_xid {1};
-    std::atomic<bool> expired {false};
     /// Mark session finalization start. Used to avoid simultaneous
     /// finalization from different threads. One-shot flag.
     std::atomic<bool> finalization_started {false};
-    std::mutex push_request_mutex;
 
     using clock = std::chrono::steady_clock;
 
@@ -225,7 +223,7 @@ private:
 
     using RequestsQueue = ConcurrentBoundedQueue<RequestInfo>;
 
-    RequestsQueue requests_queue{1};
+    RequestsQueue requests_queue{1024};
     void pushRequest(RequestInfo && info);
 
     using Operations = std::map<XID, RequestInfo>;

src/Common/ya.make

@@ -118,7 +118,6 @@ SRCS(
     isLocalAddress.cpp
     isValidUTF8.cpp
     malloc.cpp
-    memory.cpp
     new_delete.cpp
     parseAddress.cpp
     parseGlobs.cpp

src/Common/ya.make.in

@@ -24,7 +24,7 @@ INCLUDE(${ARCADIA_ROOT}/clickhouse/cmake/yandex/ya.make.versions.inc)
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Compression/ya.make

@@ -32,6 +32,7 @@ SRCS(
     CompressionCodecT64.cpp
     CompressionCodecZSTD.cpp
     CompressionFactory.cpp
+    CompressionFactoryAdditions.cpp
     ICompressionCodec.cpp
     LZ4_decompress_faster.cpp
     getCompressionCodecForFile.cpp

src/Compression/ya.make.in

@@ -15,7 +15,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Core/ExternalTable.cpp

@@ -12,7 +12,6 @@
 #include <IO/LimitReadBuffer.h>
 
 #include <Processors/Pipe.h>
-#include <Processors/Sources/SinkToOutputStream.h>
 #include <Processors/Executors/PipelineExecutor.h>
 #include <Processors/Sources/SourceFromInputStream.h>
 #include <Processors/Sinks/SinkToStorage.h>

src/Core/Settings.h

@@ -75,6 +75,7 @@ class IColumn;
     M(UInt64, s3_max_single_read_retries, 4, "The maximum number of retries during single S3 read.", 0) \
     M(UInt64, s3_max_redirects, 10, "Max number of S3 redirects hops allowed.", 0) \
     M(UInt64, s3_max_connections, 1024, "The maximum number of connections per server.", 0) \
+    M(UInt64, http_max_single_read_retries, 4, "The maximum number of retries during single http read.", 0) \
     M(Bool, extremes, false, "Calculate minimums and maximums of the result columns. They can be output in JSON-formats.", IMPORTANT) \
     M(Bool, use_uncompressed_cache, false, "Whether to use the cache of uncompressed blocks.", 0) \
     M(Bool, replace_running_query, false, "Whether the running request should be canceled with the same id as the new one.", 0) \

src/Core/ya.make

@@ -37,6 +37,7 @@ SRCS(
     PostgreSQL/insertPostgreSQLValue.cpp
     PostgreSQLProtocol.cpp
     QueryProcessingStage.cpp
+    ServerUUID.cpp
     Settings.cpp
     SettingsEnums.cpp
     SettingsFields.cpp

src/Core/ya.make.in

@@ -10,7 +10,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/DataStreams/ya.make

@@ -44,6 +44,7 @@ SRCS(
     SquashingTransform.cpp
     TTLAggregationAlgorithm.cpp
     TTLBlockInputStream.cpp
+    TTLCalcInputStream.cpp
     TTLColumnAlgorithm.cpp
     TTLDeleteAlgorithm.cpp
     TTLUpdateInfoAlgorithm.cpp

src/DataTypes/ya.make.in

@@ -9,7 +9,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Databases/DatabaseAtomic.cpp

@@ -416,7 +416,8 @@ UUID DatabaseAtomic::tryGetTableUUID(const String & table_name) const
     return UUIDHelpers::Nil;
 }
 
-void DatabaseAtomic::loadStoredObjects(ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseAtomic::loadStoredObjects(
+    ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables)
 {
     /// Recreate symlinks to table data dirs in case of force restore, because some of them may be broken
     if (has_force_restore_data_flag)
@@ -433,7 +434,7 @@ void DatabaseAtomic::loadStoredObjects(ContextMutablePtr local_context, bool has
         }
     }
 
-    DatabaseOrdinary::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach);
+    DatabaseOrdinary::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach, skip_startup_tables);
 
     if (has_force_restore_data_flag)
     {

src/Databases/DatabaseAtomic.h

@@ -47,7 +47,7 @@ public:
 
     DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;
 
-    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables) override;
 
     /// Atomic database cannot be detached if there is detached table which still in use
     void assertCanBeDetached(bool cleanup) override;

src/Databases/DatabaseLazy.cpp

@@ -36,9 +36,7 @@ DatabaseLazy::DatabaseLazy(const String & name_, const String & metadata_path_,
 
 
 void DatabaseLazy::loadStoredObjects(
-    ContextMutablePtr local_context,
+    ContextMutablePtr local_context, bool /* has_force_restore_data_flag */, bool /*force_attach*/, bool /* skip_startup_tables */)
-    bool /* has_force_restore_data_flag */,
-    bool /*force_attach*/)
 {
     iterateMetadataFiles(local_context, [this](const String & file_name)
     {
@@ -246,6 +244,8 @@ StoragePtr DatabaseLazy::loadTable(const String & table_name) const
 
         if (!ast || !endsWith(table->getName(), "Log"))
             throw Exception("Only *Log tables can be used with Lazy database engine.", ErrorCodes::LOGICAL_ERROR);
+
+        table->startup();
         {
             std::lock_guard lock(mutex);
             auto it = tables_cache.find(table_name);

src/Databases/DatabaseLazy.h

@@ -26,9 +26,7 @@ public:
 
     bool canContainDistributedTables() const override { return false; }
 
-    void loadStoredObjects(
+    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables) override;
-        ContextMutablePtr context,
-        bool has_force_restore_data_flag, bool force_attach) override;
 
     void createTable(
         ContextPtr context,

src/Databases/DatabaseOrdinary.cpp

@@ -83,7 +83,8 @@ DatabaseOrdinary::DatabaseOrdinary(
 {
 }
 
-void DatabaseOrdinary::loadStoredObjects(ContextMutablePtr local_context, bool has_force_restore_data_flag, bool /*force_attach*/)
+void DatabaseOrdinary::loadStoredObjects(
+    ContextMutablePtr local_context, bool has_force_restore_data_flag, bool /*force_attach*/, bool skip_startup_tables)
 {
     /** Tables load faster if they are loaded in sorted (by name) order.
       * Otherwise (for the ext4 filesystem), `DirectoryIterator` iterates through them in some order,
@@ -201,12 +202,20 @@ void DatabaseOrdinary::loadStoredObjects(ContextMutablePtr local_context, bool h
 
     pool.wait();
 
+    if (!skip_startup_tables)
+    {
         /// After all tables was basically initialized, startup them.
-    startupTables(pool);
+        startupTablesImpl(pool);
+    }
 }
 
+void DatabaseOrdinary::startupTables()
+{
+    ThreadPool pool;
+    startupTablesImpl(pool);
+}
 
-void DatabaseOrdinary::startupTables(ThreadPool & thread_pool)
+void DatabaseOrdinary::startupTablesImpl(ThreadPool & thread_pool)
 {
     LOG_INFO(log, "Starting up tables.");
 

src/Databases/DatabaseOrdinary.h

@@ -20,7 +20,9 @@ public:
 
     String getEngineName() const override { return "Ordinary"; }
 
-    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables) override;
+
+    void startupTables() override;
 
     void alterTable(
         ContextPtr context,
@@ -35,7 +37,7 @@ protected:
         const String & statement,
         ContextPtr query_context);
 
-    void startupTables(ThreadPool & thread_pool);
+    void startupTablesImpl(ThreadPool & thread_pool);
 };
 
 }

src/Databases/DatabaseReplicated.cpp

@@ -305,11 +305,12 @@ void DatabaseReplicated::createReplicaNodesInZooKeeper(const zkutil::ZooKeeperPt
     createEmptyLogEntry(current_zookeeper);
 }
 
-void DatabaseReplicated::loadStoredObjects(ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseReplicated::loadStoredObjects(
+    ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables)
 {
     tryConnectToZooKeeperAndInitDatabase(force_attach);
 
-    DatabaseAtomic::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach);
+    DatabaseAtomic::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach, skip_startup_tables);
 
     ddl_worker = std::make_unique<DatabaseReplicatedDDLWorker>(this, getContext());
     ddl_worker->startup();

src/Databases/DatabaseReplicated.h

@@ -57,7 +57,7 @@ public:
 
     void drop(ContextPtr /*context*/) override;
 
-    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables) override;
     void shutdown() override;
 
     friend struct DatabaseReplicatedTask;

src/Databases/IDatabase.h

@@ -123,7 +123,15 @@ public:
 
     /// Load a set of existing tables.
     /// You can call only once, right after the object is created.
-    virtual void loadStoredObjects(ContextMutablePtr /*context*/, bool /*has_force_restore_data_flag*/, bool /*force_attach*/ = false) {}
+    virtual void loadStoredObjects(
+        ContextMutablePtr /*context*/,
+        bool /*has_force_restore_data_flag*/,
+        bool /*force_attach*/ = false,
+        bool /* skip_startup_tables */ = false)
+    {
+    }
+
+    virtual void startupTables() {}
 
     /// Check the existence of the table.
     virtual bool isTableExist(const String & name, ContextPtr context) const = 0;

src/Databases/MySQL/DatabaseMaterializedMySQL.cpp

@@ -93,10 +93,11 @@ void DatabaseMaterializedMySQL<Base>::setException(const std::exception_ptr & ex
     exception = exception_;
 }
 
-template<typename Base>
+template <typename Base>
-void DatabaseMaterializedMySQL<Base>::loadStoredObjects(ContextMutablePtr context_, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseMaterializedMySQL<Base>::loadStoredObjects(
+    ContextMutablePtr context_, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables)
 {
-    Base::loadStoredObjects(context_, has_force_restore_data_flag, force_attach);
+    Base::loadStoredObjects(context_, has_force_restore_data_flag, force_attach, skip_startup_tables);
     if (!force_attach)
         materialize_thread.assertMySQLAvailable();
 

src/Databases/MySQL/DatabaseMaterializedMySQL.h

@@ -43,7 +43,7 @@ protected:
 public:
     String getEngineName() const override { return "MaterializedMySQL"; }
 
-    void loadStoredObjects(ContextMutablePtr context_, bool has_force_restore_data_flag, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr context_, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables) override;
 
     void createTable(ContextPtr context_, const String & name, const StoragePtr & table, const ASTPtr & query) override;
 

src/Databases/MySQL/DatabaseMySQL.cpp

@@ -405,7 +405,7 @@ String DatabaseMySQL::getMetadataPath() const
     return metadata_path;
 }
 
-void DatabaseMySQL::loadStoredObjects(ContextMutablePtr, bool, bool /*force_attach*/)
+void DatabaseMySQL::loadStoredObjects(ContextMutablePtr, bool, bool /*force_attach*/, bool /* skip_startup_tables */)
 {
 
     std::lock_guard<std::mutex> lock{mutex};

src/Databases/MySQL/DatabaseMySQL.h

@@ -75,7 +75,7 @@ public:
 
     void createTable(ContextPtr, const String & table_name, const StoragePtr & storage, const ASTPtr & create_query) override;
 
-    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach, bool skip_startup_tables) override;
 
     StoragePtr detachTable(const String & table_name) override;
 

src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.cpp

@@ -109,9 +109,10 @@ void DatabaseMaterializedPostgreSQL::startSynchronization()
 }
 
 
-void DatabaseMaterializedPostgreSQL::loadStoredObjects(ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach)
+void DatabaseMaterializedPostgreSQL::loadStoredObjects(
+    ContextMutablePtr local_context, bool has_force_restore_data_flag, bool force_attach, bool skip_startup_tables)
 {
-    DatabaseAtomic::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach);
+    DatabaseAtomic::loadStoredObjects(local_context, has_force_restore_data_flag, force_attach, skip_startup_tables);
 
     try
     {
@@ -124,7 +125,6 @@ void DatabaseMaterializedPostgreSQL::loadStoredObjects(ContextMutablePtr local_c
         if (!force_attach)
             throw;
     }
-
 }
 
 

src/Databases/PostgreSQL/DatabaseMaterializedPostgreSQL.h

@@ -43,10 +43,10 @@ public:
 
     String getMetadataPath() const override { return metadata_path; }
 
-    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach, bool skip_startup_tables) override;
 
-    DatabaseTablesIteratorPtr getTablesIterator(
+    DatabaseTablesIteratorPtr
-            ContextPtr context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const override;
+    getTablesIterator(ContextPtr context, const DatabaseOnDisk::FilterByNameFunction & filter_by_table_name) const override;
 
     StoragePtr tryGetTable(const String & name, ContextPtr context) const override;
 

src/Databases/PostgreSQL/DatabasePostgreSQL.cpp

@@ -280,7 +280,7 @@ void DatabasePostgreSQL::drop(ContextPtr /*context*/)
 }
 
 
-void DatabasePostgreSQL::loadStoredObjects(ContextMutablePtr /* context */, bool, bool /*force_attach*/)
+void DatabasePostgreSQL::loadStoredObjects(ContextMutablePtr /* context */, bool, bool /*force_attach*/, bool /* skip_startup_tables */)
 {
     {
         std::lock_guard<std::mutex> lock{mutex};

src/Databases/PostgreSQL/DatabasePostgreSQL.h

@@ -48,7 +48,7 @@ public:
 
     bool empty() const override;
 
-    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach) override;
+    void loadStoredObjects(ContextMutablePtr, bool, bool force_attach, bool skip_startup_tables) override;
 
     DatabaseTablesIteratorPtr getTablesIterator(ContextPtr context, const FilterByNameFunction & filter_by_table_name) const override;
 

src/Disks/DiskType.h

@@ -11,7 +11,8 @@ enum class DiskType
     RAM,
     S3,
     HDFS,
-    Encrypted
+    Encrypted,
+    WebServer,
 };
 
 inline String toString(DiskType disk_type)
@@ -28,6 +29,8 @@ inline String toString(DiskType disk_type)
             return "hdfs";
         case DiskType::Encrypted:
             return "encrypted";
+        case DiskType::WebServer:
+            return "web";
     }
     __builtin_unreachable();
 }

src/Disks/DiskWebServer.cpp

@@ -0,0 +1,336 @@
+#include "DiskWebServer.h"
+
+#include <common/logger_useful.h>
+
+#include <IO/ReadWriteBufferFromHTTP.h>
+#include <Disks/ReadIndirectBufferFromWebServer.h>
+#include <IO/SeekAvoidingReadBuffer.h>
+#include <IO/ReadHelpers.h>
+#include <IO/WriteHelpers.h>
+
+#include <Disks/ReadIndirectBufferFromRemoteFS.h>
+#include <Disks/IDiskRemote.h>
+#include <Access/AccessControlManager.h>
+#include <Poco/Exception.h>
+
+#include <re2/re2.h>
+
+
+#define UUID_PATTERN "[\\w]{8}-[\\w]{4}-[\\w]{4}-[\\w]{4}-[\\w]{12}"
+#define EXTRACT_UUID_PATTERN fmt::format(".*/({})/.*", UUID_PATTERN)
+
+#define DIRECTORY_FILE_PATTERN(prefix) fmt::format("{}-({})-(\\w+)-(\\w+\\.\\w+)", prefix, UUID_PATTERN)
+#define ROOT_FILE_PATTERN(prefix) fmt::format("{}-({})-(\\w+\\.\\w+)", prefix, UUID_PATTERN)
+
+#define MATCH_DIRECTORY_FILE_PATTERN fmt::format(".*/({})/(\\w+)/(\\w+\\.\\w+)", UUID_PATTERN)
+#define MATCH_ROOT_FILE_PATTERN fmt::format(".*/({})/(\\w+\\.\\w+)", UUID_PATTERN)
+
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int BAD_ARGUMENTS;
+    extern const int LOGICAL_ERROR;
+    extern const int NETWORK_ERROR;
+    extern const int NOT_IMPLEMENTED;
+}
+
+
+void DiskWebServer::Metadata::initialize(const String & uri_with_path, const String & files_prefix, const String & table_uuid, ContextPtr context) const
+{
+    ReadWriteBufferFromHTTP metadata_buf(Poco::URI(fs::path(uri_with_path) / (".index-" + table_uuid)),
+                                         Poco::Net::HTTPRequest::HTTP_GET,
+                                         ReadWriteBufferFromHTTP::OutStreamCallback(),
+                                         ConnectionTimeouts::getHTTPTimeouts(context));
+    String uuid, directory, file, remote_file_name;
+    size_t file_size;
+
+    while (!metadata_buf.eof())
+    {
+        readText(remote_file_name, metadata_buf);
+        assertChar('\t', metadata_buf);
+        readIntText(file_size, metadata_buf);
+        assertChar('\n', metadata_buf);
+        LOG_DEBUG(&Poco::Logger::get("DiskWeb"), "Read file: {}, size: {}", remote_file_name, file_size);
+
+        /*
+         * URI/   {prefix}-{uuid}-all_x_x_x-{file}
+         *        ...
+         *        {prefix}-{uuid}-format_version.txt
+         *        {prefix}-{uuid}-detached-{file}
+         *        ...
+        **/
+        if (RE2::FullMatch(remote_file_name, DIRECTORY_FILE_PATTERN(files_prefix), &uuid, &directory, &file))
+        {
+            if (uuid != table_uuid)
+                throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected uuid: {}, expected: {}", uuid, table_uuid);
+
+            tables_data[uuid][directory].emplace(File(file, file_size));
+        }
+        else if (RE2::FullMatch(remote_file_name, ROOT_FILE_PATTERN(files_prefix), &uuid, &file))
+        {
+            if (uuid != table_uuid)
+                throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected uuid: {}, expected: {}", uuid, table_uuid);
+
+            tables_data[uuid][file].emplace(File(file, file_size));
+        }
+        else
+            throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected file: {}", remote_file_name);
+    }
+}
+
+
+template <typename T>
+class DiskWebDirectoryIterator final : public IDiskDirectoryIterator
+{
+public:
+    using Directory = std::unordered_map<String, T>;
+
+    DiskWebDirectoryIterator(Directory & directory_, const String & directory_root_)
+        : directory(directory_), iter(directory.begin()), directory_root(directory_root_)
+    {
+    }
+
+    void next() override { ++iter; }
+
+    bool isValid() const override
+    {
+        return iter != directory.end();
+    }
+
+    String path() const override
+    {
+        return fs::path(directory_root) / name();
+    }
+
+    String name() const override
+    {
+        return iter->first;
+    }
+
+private:
+    Directory & directory;
+    typename Directory::iterator iter;
+    const String directory_root;
+};
+
+
+class ReadBufferFromWebServer final : public ReadIndirectBufferFromRemoteFS<ReadIndirectBufferFromWebServer>
+{
+public:
+    ReadBufferFromWebServer(
+            const String & uri_,
+            RemoteMetadata metadata_,
+            ContextPtr context_,
+            size_t max_read_tries_,
+            size_t buf_size_)
+        : ReadIndirectBufferFromRemoteFS<ReadIndirectBufferFromWebServer>(metadata_)
+        , uri(uri_)
+        , context(context_)
+        , max_read_tries(max_read_tries_)
+        , buf_size(buf_size_)
+    {
+    }
+
+    std::unique_ptr<ReadIndirectBufferFromWebServer> createReadBuffer(const String & path) override
+    {
+        return std::make_unique<ReadIndirectBufferFromWebServer>(fs::path(uri) / path, context, max_read_tries, buf_size);
+    }
+
+private:
+    String uri;
+    ContextPtr context;
+    size_t max_read_tries;
+    size_t buf_size;
+};
+
+
+class WriteBufferFromNothing : public WriteBufferFromFile
+{
+public:
+    WriteBufferFromNothing() : WriteBufferFromFile("/dev/null") {}
+
+    void sync() override {}
+};
+
+
+DiskWebServer::DiskWebServer(
+            const String & disk_name_,
+            const String & uri_,
+            const String & metadata_path_,
+            ContextPtr context_,
+            SettingsPtr settings_)
+        : WithContext(context_->getGlobalContext())
+        , log(&Poco::Logger::get("DiskWeb"))
+        , uri(uri_)
+        , name(disk_name_)
+        , metadata_path(metadata_path_)
+        , settings(std::move(settings_))
+{
+}
+
+
+String DiskWebServer::getFileName(const String & path) const
+{
+    String result;
+
+    if (RE2::FullMatch(path, MATCH_DIRECTORY_FILE_PATTERN)
+        && RE2::Extract(path, MATCH_DIRECTORY_FILE_PATTERN, fmt::format(R"({}-\1-\2-\3)", settings->files_prefix), &result))
+        return result;
+
+    if (RE2::FullMatch(path, MATCH_ROOT_FILE_PATTERN)
+        && RE2::Extract(path, MATCH_ROOT_FILE_PATTERN, fmt::format(R"({}-\1-\2)", settings->files_prefix), &result))
+        return result;
+
+    throw Exception(ErrorCodes::LOGICAL_ERROR, "Unexpected file: {}", path);
+}
+
+
+bool DiskWebServer::findFileInMetadata(const String & path, File & file_info) const
+{
+    String table_uuid, directory_name, file_name;
+
+    if (RE2::FullMatch(path, MATCH_DIRECTORY_FILE_PATTERN, &table_uuid, &directory_name, &file_name)
+       || RE2::FullMatch(path, MATCH_ROOT_FILE_PATTERN, &table_uuid, &file_name))
+    {
+        if (directory_name.empty())
+            directory_name = file_name;
+
+        if (!metadata.tables_data.count(table_uuid))
+            return false;
+
+        if (!metadata.tables_data[table_uuid].count(directory_name))
+            return false;
+
+        const auto & files = metadata.tables_data[table_uuid][directory_name];
+        auto file = files.find(File(file_name));
+        if (file == files.end())
+            return false;
+
+        file_info = *file;
+        return true;
+    }
+
+    return false;
+}
+
+
+bool DiskWebServer::exists(const String & path) const
+{
+    LOG_DEBUG(log, "Checking existence of file: {}", path);
+
+    File file;
+    return findFileInMetadata(path, file);
+}
+
+
+std::unique_ptr<ReadBufferFromFileBase> DiskWebServer::readFile(const String & path, const ReadSettings & read_settings, size_t) const
+{
+    LOG_DEBUG(log, "Read from file by path: {}", path);
+
+    File file;
+    if (!findFileInMetadata(path, file))
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "File {} not found", path);
+
+    RemoteMetadata meta(uri, fs::path(path).parent_path() / fs::path(path).filename());
+    meta.remote_fs_objects.emplace_back(std::make_pair(getFileName(path), file.size));
+
+    auto reader = std::make_unique<ReadBufferFromWebServer>(uri, meta, getContext(), settings->max_read_tries, read_settings.remote_fs_buffer_size);
+    return std::make_unique<SeekAvoidingReadBuffer>(std::move(reader), settings->min_bytes_for_seek);
+}
+
+
+std::unique_ptr<WriteBufferFromFileBase> DiskWebServer::writeFile(const String & path, size_t, WriteMode)
+{
+    if (path.ends_with("format_version.txt"))
+        return std::make_unique<WriteBufferFromNothing>();
+
+    throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+}
+
+
+DiskDirectoryIteratorPtr DiskWebServer::iterateDirectory(const String & path)
+{
+    LOG_DEBUG(log, "Iterate directory: {}", path);
+    String uuid;
+
+    if (RE2::FullMatch(path, ".*/store/"))
+        return std::make_unique<DiskWebDirectoryIterator<RootDirectory>>(metadata.tables_data, path);
+
+    if (!RE2::Extract(path, EXTRACT_UUID_PATTERN, "\\1", &uuid))
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "Cannot extract uuid for: {}", path);
+
+    /// Do not throw if it is not a query, but disk load.
+    bool can_throw = CurrentThread::isInitialized() && CurrentThread::get().getQueryContext();
+
+    try
+    {
+        if (!metadata.tables_data.count(uuid))
+            metadata.initialize(uri, settings->files_prefix, uuid, getContext());
+    }
+    catch (const Poco::Exception &)
+    {
+        const auto message = getCurrentExceptionMessage(false);
+        if (can_throw)
+        {
+            throw Exception(ErrorCodes::NETWORK_ERROR, "Cannot load disk metadata. Error: {}", message);
+        }
+
+        LOG_TRACE(&Poco::Logger::get("DiskWeb"), "Cannot load disk metadata. Error: {}", message);
+        /// Empty iterator.
+        return std::make_unique<DiskWebDirectoryIterator<Directory>>(metadata.tables_data[""], path);
+    }
+
+    return std::make_unique<DiskWebDirectoryIterator<Directory>>(metadata.tables_data[uuid], path);
+}
+
+
+size_t DiskWebServer::getFileSize(const String & path) const
+{
+    File file;
+    if (!findFileInMetadata(path, file))
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "File {} not found", path);
+    return file.size;
+}
+
+
+bool DiskWebServer::isFile(const String & path) const
+{
+    return RE2::FullMatch(path, ".*/\\w+.\\w+");
+}
+
+
+bool DiskWebServer::isDirectory(const String & path) const
+{
+    return RE2::FullMatch(path, ".*/\\w+");
+}
+
+
+void registerDiskWebServer(DiskFactory & factory)
+{
+    auto creator = [](const String & disk_name,
+                      const Poco::Util::AbstractConfiguration & config,
+                      const String & config_prefix,
+                      ContextPtr context,
+                      const DisksMap & /*map*/) -> DiskPtr
+    {
+        String uri{config.getString(config_prefix + ".endpoint")};
+        if (!uri.ends_with('/'))
+            throw Exception(ErrorCodes::BAD_ARGUMENTS, "URI must end with '/', but '{}' doesn't.", uri);
+
+        auto settings = std::make_unique<DiskWebServerSettings>(
+            context->getGlobalContext()->getSettingsRef().http_max_single_read_retries,
+            config.getUInt64(config_prefix + ".min_bytes_for_seek", 1024 * 1024),
+            config.getString(config_prefix + ".files_prefix", disk_name));
+
+        String metadata_path = fs::path(context->getPath()) / "disks" / disk_name / "";
+
+        return std::make_shared<DiskWebServer>(disk_name, uri, metadata_path, context, std::move(settings));
+    };
+
+    factory.registerDiskType("web", creator);
+}
+
+}

src/Disks/DiskWebServer.h

@@ -0,0 +1,234 @@
+#pragma once
+
+#include <Disks/IDiskRemote.h>
+#include <IO/WriteBufferFromFile.h>
+#include <Core/UUID.h>
+#include <set>
+
+
+namespace DB
+{
+namespace ErrorCodes
+{
+    extern const int NOT_IMPLEMENTED;
+}
+
+struct DiskWebServerSettings
+{
+    /// Number of read attempts before throw that network is unreachable.
+    size_t max_read_tries;
+    /// Passed to SeekAvoidingReadBuffer.
+    size_t min_bytes_for_seek;
+    String files_prefix;
+
+    DiskWebServerSettings(size_t max_read_tries_, size_t min_bytes_for_seek_, String files_prefix_)
+        : max_read_tries(max_read_tries_) , min_bytes_for_seek(min_bytes_for_seek_), files_prefix(files_prefix_) {}
+};
+
+
+/*
+ * Quick ready test - you can try this disk, by using these queries (disk has two tables) and this endpoint:
+ *
+ *  ATTACH TABLE contributors UUID 'a563f7d8-fb00-4d50-a563-f7d8fb007d50' (good_person_name String) engine=MergeTree() order by good_person_name settings storage_policy='web';
+ *  ATTACH TABLE test UUID '11c7a2f9-a949-4c88-91c7-a2f9a949ec88' (a Int32) engine=MergeTree() order by a settings storage_policy='web';
+ *
+ *   <storage_configuration>
+ *       <disks>
+ *           <web>
+ *               <type>web</type>
+ *               <endpoint>https://clickhouse-datasets.s3.yandex.net/kssenii-static-files-disk-test/kssenii-disk-tests/test1/</endpoint>
+ *               <files_prefix>data</files_prefix>
+ *           </web>
+ *       </disks>
+ *       <policies>
+ *           <web>
+ *               <volumes>
+ *                   <main>
+ *                       <disk>web</disk>
+ *                   </main>
+ *               </volumes>
+ *           </web>
+ *       </policies>
+ *   </storage_configuration>
+ *
+ * To get files for upload run:
+ * clickhouse static-files-disk-uploader --metadata-path <path> --output-dir <dir> --files-prefix data
+ * (--metadata-path can be found in query: `select data_paths from system.tables where name='<table_name>';`)
+ *
+ * If url is not reachable on disk load when server is starting up tables, then all errors are caught.
+ * If in this case there were errors, tables can be reloaded (become visible) via detach table table_name -> attach table table_name.
+ * If metadata was successfully loaded at server startup, then tables are available straight away.
+**/
+class DiskWebServer : public IDisk, WithContext
+{
+using SettingsPtr = std::unique_ptr<DiskWebServerSettings>;
+
+public:
+    DiskWebServer(const String & disk_name_,
+                  const String & files_root_path_uri_,
+                  const String & metadata_path_,
+                  ContextPtr context,
+                  SettingsPtr settings_);
+
+    struct File
+    {
+        String name;
+        size_t size;
+        File(const String & name_ = "", const size_t size_ = 0) : name(name_), size(size_) {}
+        bool operator<(const File & other) const { return name < other.name; }
+        bool operator==(const File & other) const { return name == other.name; }
+    };
+
+    using Directory = std::set<File>;
+
+    /* Each root directory contains either directories like
+     * all_x_x_x/{file}, detached/, etc, or root files like format_version.txt.
+     */
+    using RootDirectory = std::unordered_map<String, Directory>;
+
+    /* Each table is attached via ATTACH TABLE table UUID <uuid> <def>.
+     * Then there is a mapping: {table uuid} -> {root directory}
+     */
+    using TableDirectories = std::unordered_map<String, RootDirectory>;
+
+    struct Metadata
+    {
+        /// Fetch meta only when required.
+        mutable TableDirectories tables_data;
+
+        Metadata() {}
+
+        void initialize(const String & uri_with_path, const String & files_prefix, const String & uuid, ContextPtr context) const;
+    };
+
+    bool findFileInMetadata(const String & path, File & file_info) const;
+
+    bool supportZeroCopyReplication() const override { return false; }
+
+    String getFileName(const String & path) const;
+
+    DiskType getType() const override { return DiskType::WebServer; }
+
+    bool isRemote() const override { return true; }
+
+    std::unique_ptr<ReadBufferFromFileBase> readFile(const String & path,
+                                                     const ReadSettings & settings,
+                                                     size_t estimated_size) const override;
+
+    /// Disk info
+
+    const String & getName() const final override { return name; }
+
+    const String & getPath() const final override { return metadata_path; }
+
+    bool isReadOnly() const override { return true; }
+
+    UInt64 getTotalSpace() const final override { return std::numeric_limits<UInt64>::max(); }
+
+    UInt64 getAvailableSpace() const final override { return std::numeric_limits<UInt64>::max(); }
+
+    UInt64 getUnreservedSpace() const final override { return std::numeric_limits<UInt64>::max(); }
+
+    /// Read-only part
+
+    bool exists(const String & path) const override;
+
+    bool isFile(const String & path) const override;
+
+    size_t getFileSize(const String & path) const override;
+
+    void listFiles(const String & /* path */, std::vector<String> & /* file_names */) override { }
+
+    void setReadOnly(const String & /* path */) override {}
+
+    bool isDirectory(const String & path) const override;
+
+    DiskDirectoryIteratorPtr iterateDirectory(const String & /* path */) override;
+
+    Poco::Timestamp getLastModified(const String &) override { return Poco::Timestamp{}; }
+
+    /// Write and modification part
+
+    std::unique_ptr<WriteBufferFromFileBase> writeFile(const String &, size_t, WriteMode) override;
+
+    void moveFile(const String &, const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void replaceFile(const String &, const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeFile(const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeFileIfExists(const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    ReservationPtr reserve(UInt64 /*bytes*/) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeRecursive(const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeSharedFile(const String &, bool) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeSharedRecursive(const String &, bool) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void clearDirectory(const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void moveDirectory(const String &, const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void removeDirectory(const String &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    void setLastModified(const String &, const Poco::Timestamp &) override
+    {
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Disk {} is read-only", getName());
+    }
+
+    /// Create part
+
+    void createFile(const String &) final override {}
+
+    void createDirectory(const String &) override {}
+
+    void createDirectories(const String &) override {}
+
+    void createHardLink(const String &, const String &) override {}
+
+private:
+
+    Poco::Logger * log;
+    String uri, name;
+    const String metadata_path;
+    SettingsPtr settings;
+
+    Metadata metadata;
+};
+
+}

src/Disks/IDisk.h

@@ -226,6 +226,8 @@ public:
     /// Overrode in remote fs disks.
     virtual bool supportZeroCopyReplication() const = 0;
 
+    virtual bool isReadOnly() const { return false; }
+
     /// Invoked when Global Context is shutdown.
     virtual void shutdown() {}
 

src/Disks/IDiskRemote.cpp

@@ -33,10 +33,9 @@ IDiskRemote::Metadata::Metadata(
         const String & disk_path_,
         const String & metadata_file_path_,
         bool create)
-    : remote_fs_root_path(remote_fs_root_path_)
+    : RemoteMetadata(remote_fs_root_path_, metadata_file_path_)
     , disk_path(disk_path_)
-    , metadata_file_path(metadata_file_path_)
+    , total_size(0), ref_count(0)
-    , total_size(0), remote_fs_objects(0), ref_count(0)
 {
     if (create)
         return;
@@ -72,10 +71,9 @@ IDiskRemote::Metadata::Metadata(
             readEscapedString(remote_fs_object_path, buf);
             if (version == VERSION_ABSOLUTE_PATHS)
             {
-                if (!boost::algorithm::starts_with(remote_fs_object_path, remote_fs_root_path))
+                if (!remote_fs_object_path.starts_with(remote_fs_root_path))
-                    throw Exception(
+                    throw Exception(ErrorCodes::UNKNOWN_FORMAT,
-                        ErrorCodes::UNKNOWN_FORMAT,
+                        "Path in metadata does not correspond to root path. Path: {}, root path: {}, disk path: {}",
-                        "Path in metadata does not correspond S3 root path. Path: {}, root path: {}, disk path: {}",
                         remote_fs_object_path, remote_fs_root_path, disk_path_);
 
                 remote_fs_object_path = remote_fs_object_path.substr(remote_fs_root_path.size());

src/Disks/IDiskRemote.h

@@ -148,34 +148,42 @@ private:
 
 using RemoteDiskPtr = std::shared_ptr<IDiskRemote>;
 
-/// Remote FS (S3, HDFS) metadata file layout:
-/// Number of FS objects, Total size of all FS objects.
-/// Each FS object represents path where object located in FS and size of object.
 
-struct IDiskRemote::Metadata
+/// Minimum info, required to be passed to ReadIndirectBufferFromRemoteFS<T>
+struct RemoteMetadata
+{
+    using PathAndSize = std::pair<String, size_t>;
+
+    /// Remote FS objects paths and their sizes.
+    std::vector<PathAndSize> remote_fs_objects;
+
+    /// URI
+    const String & remote_fs_root_path;
+
+    /// Relative path to metadata file on local FS.
+    const String metadata_file_path;
+
+    RemoteMetadata(const String & remote_fs_root_path_, const String & metadata_file_path_)
+        : remote_fs_root_path(remote_fs_root_path_), metadata_file_path(metadata_file_path_) {}
+};
+
+/// Remote FS (S3, HDFS) metadata file layout:
+/// FS objects, their number and total size of all FS objects.
+/// Each FS object represents a file path in remote FS and its size.
+
+struct IDiskRemote::Metadata : RemoteMetadata
 {
     /// Metadata file version.
     static constexpr UInt32 VERSION_ABSOLUTE_PATHS = 1;
     static constexpr UInt32 VERSION_RELATIVE_PATHS = 2;
     static constexpr UInt32 VERSION_READ_ONLY_FLAG = 3;
 
-    using PathAndSize = std::pair<String, size_t>;
-
-    /// Remote FS (S3, HDFS) root path.
-    const String & remote_fs_root_path;
-
     /// Disk path.
     const String & disk_path;
 
-    /// Relative path to metadata file on local FS.
-    String metadata_file_path;
-
     /// Total size of all remote FS (S3, HDFS) objects.
     size_t total_size = 0;
 
-    /// Remote FS (S3, HDFS) objects paths and their sizes.
-    std::vector<PathAndSize> remote_fs_objects;
-
     /// Number of references (hardlinks) to this metadata file.
     UInt32 ref_count = 0;
 

src/Disks/ReadIndirectBufferFromRemoteFS.cpp

@@ -1,8 +1,8 @@
 #include "ReadIndirectBufferFromRemoteFS.h"
 
-#if USE_AWS_S3 || USE_HDFS
 #include <IO/ReadBufferFromS3.h>
 #include <Storages/HDFS/ReadBufferFromHDFS.h>
+#include <Disks/ReadIndirectBufferFromWebServer.h>
 
 
 namespace DB
@@ -16,7 +16,7 @@ namespace ErrorCodes
 
 template<typename T>
 ReadIndirectBufferFromRemoteFS<T>::ReadIndirectBufferFromRemoteFS(
-    IDiskRemote::Metadata metadata_)
+    RemoteMetadata metadata_)
     : metadata(std::move(metadata_))
 {
 }
@@ -137,6 +137,7 @@ template
 class ReadIndirectBufferFromRemoteFS<ReadBufferFromHDFS>;
 #endif
 
-}
+template
+class ReadIndirectBufferFromRemoteFS<ReadIndirectBufferFromWebServer>;
 
-#endif
+}

src/Disks/ReadIndirectBufferFromRemoteFS.h

@@ -4,8 +4,6 @@
 #include <Common/config.h>
 #endif
 
-#if USE_AWS_S3 || USE_HDFS
-
 #include <IO/ReadBufferFromFile.h>
 #include <Disks/IDiskRemote.h>
 #include <utility>
@@ -19,7 +17,7 @@ template <typename T>
 class ReadIndirectBufferFromRemoteFS : public ReadBufferFromFileBase
 {
 public:
-    explicit ReadIndirectBufferFromRemoteFS(IDiskRemote::Metadata metadata_);
+    explicit ReadIndirectBufferFromRemoteFS(RemoteMetadata metadata_);
 
     off_t seek(off_t offset_, int whence) override;
 
@@ -30,7 +28,7 @@ public:
     virtual std::unique_ptr<T> createReadBuffer(const String & path) = 0;
 
 protected:
-    IDiskRemote::Metadata metadata;
+    RemoteMetadata metadata;
 
 private:
     std::unique_ptr<T> initialize();
@@ -47,5 +45,3 @@ private:
 };
 
 }
-
-#endif

src/Disks/ReadIndirectBufferFromWebServer.cpp

@@ -0,0 +1,132 @@
+#include "ReadIndirectBufferFromWebServer.h"
+
+#include <common/logger_useful.h>
+#include <Core/Types.h>
+#include <IO/ReadWriteBufferFromHTTP.h>
+#include <IO/ConnectionTimeoutsContext.h>
+#include <thread>
+
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int CANNOT_SEEK_THROUGH_FILE;
+    extern const int SEEK_POSITION_OUT_OF_BOUND;
+    extern const int NETWORK_ERROR;
+}
+
+
+ReadIndirectBufferFromWebServer::ReadIndirectBufferFromWebServer(const String & url_,
+                                                                 ContextPtr context_,
+                                                                 size_t max_read_tries_,
+                                                                 size_t buf_size_)
+    : BufferWithOwnMemory<SeekableReadBuffer>(buf_size_)
+    , log(&Poco::Logger::get("ReadIndirectBufferFromWebServer"))
+    , context(context_)
+    , url(url_)
+    , buf_size(buf_size_)
+    , max_read_tries(max_read_tries_)
+{
+}
+
+
+std::unique_ptr<ReadBuffer> ReadIndirectBufferFromWebServer::initialize()
+{
+    Poco::URI uri(url);
+
+    ReadWriteBufferFromHTTP::HTTPHeaderEntries headers;
+    headers.emplace_back(std::make_pair("Range", fmt::format("bytes={}-", offset)));
+    LOG_DEBUG(log, "Reading from offset: {}", offset);
+
+    return std::make_unique<ReadWriteBufferFromHTTP>(
+        uri,
+        Poco::Net::HTTPRequest::HTTP_GET,
+        ReadWriteBufferFromHTTP::OutStreamCallback(),
+        ConnectionTimeouts::getHTTPTimeouts(context),
+        0,
+        Poco::Net::HTTPBasicCredentials{},
+        buf_size,
+        headers);
+}
+
+
+bool ReadIndirectBufferFromWebServer::nextImpl()
+{
+    bool next_result = false, successful_read = false;
+
+    if (impl)
+    {
+        /// Restore correct position at the needed offset.
+        impl->position() = position();
+        assert(!impl->hasPendingData());
+    }
+    else
+    {
+        try
+        {
+            impl = initialize();
+        }
+        catch (const Poco::Exception & e)
+        {
+            throw Exception(ErrorCodes::NETWORK_ERROR, "Unreachable url: {}. Error: {}", url, e.what());
+        }
+
+        next_result = impl->hasPendingData();
+    }
+
+    for (size_t try_num = 0; (try_num < max_read_tries) && !next_result; ++try_num)
+    {
+        try
+        {
+            next_result = impl->next();
+            successful_read = true;
+            break;
+        }
+        catch (const Exception & e)
+        {
+            LOG_WARNING(log, "Read attempt {}/{} failed from {}. ({})", try_num, max_read_tries, url, e.message());
+
+            impl.reset();
+            impl = initialize();
+            next_result = impl->hasPendingData();
+        }
+    }
+
+    if (!successful_read)
+        throw Exception(ErrorCodes::NETWORK_ERROR, "All read attempts ({}) failed for uri: {}", max_read_tries, url);
+
+    if (next_result)
+    {
+        BufferBase::set(impl->buffer().begin(), impl->buffer().size(), impl->offset());
+        offset += working_buffer.size();
+    }
+
+    return next_result;
+}
+
+
+off_t ReadIndirectBufferFromWebServer::seek(off_t offset_, int whence)
+{
+    if (impl)
+        throw Exception(ErrorCodes::CANNOT_SEEK_THROUGH_FILE, "Seek is allowed only before first read attempt from the buffer");
+
+    if (whence != SEEK_SET)
+        throw Exception(ErrorCodes::CANNOT_SEEK_THROUGH_FILE, "Only SEEK_SET mode is allowed");
+
+    if (offset_ < 0)
+        throw Exception(ErrorCodes::SEEK_POSITION_OUT_OF_BOUND, "Seek position is out of bounds. Offset: {}", std::to_string(offset_));
+
+    offset = offset_;
+
+    return offset;
+}
+
+
+off_t ReadIndirectBufferFromWebServer::getPosition()
+{
+    return offset - available();
+}
+
+}

src/Disks/ReadIndirectBufferFromWebServer.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <IO/SeekableReadBuffer.h>
+#include <IO/BufferWithOwnMemory.h>
+#include <Interpreters/Context.h>
+
+
+namespace DB
+{
+
+/* Read buffer, which reads via http, but is used as ReadBufferFromFileBase.
+ * Used to read files, hosted on a web server with static files.
+ *
+ * Usage: ReadIndirectBufferFromRemoteFS -> SeekAvoidingReadBuffer -> ReadIndirectBufferFromWebServer -> ReadWriteBufferFromHTTP.
+ */
+class ReadIndirectBufferFromWebServer : public BufferWithOwnMemory<SeekableReadBuffer>
+{
+public:
+    explicit ReadIndirectBufferFromWebServer(const String & url_,
+                                             ContextPtr context_,
+                                             size_t max_read_tries_,
+                                             size_t buf_size_ = DBMS_DEFAULT_BUFFER_SIZE);
+
+    bool nextImpl() override;
+
+    off_t seek(off_t off, int whence) override;
+
+    off_t getPosition() override;
+
+private:
+    std::unique_ptr<ReadBuffer> initialize();
+
+    Poco::Logger * log;
+    ContextPtr context;
+
+    const String url;
+    size_t buf_size, max_read_tries;
+
+    std::unique_ptr<ReadBuffer> impl;
+
+    off_t offset = 0;
+};
+
+}

src/Disks/S3/DiskS3.cpp

@@ -146,7 +146,7 @@ public:
 
     std::unique_ptr<ReadBufferFromS3> createReadBuffer(const String & path) override
     {
-        return std::make_unique<ReadBufferFromS3>(client_ptr, bucket, metadata.remote_fs_root_path + path, max_single_read_retries, buf_size);
+        return std::make_unique<ReadBufferFromS3>(client_ptr, bucket, fs::path(metadata.remote_fs_root_path) / path, max_single_read_retries, buf_size);
     }
 
 private:

src/Disks/WriteIndirectBufferFromRemoteFS.cpp

@@ -1,8 +1,8 @@
 #include "WriteIndirectBufferFromRemoteFS.h"
 
-#if USE_AWS_S3 || USE_HDFS
 #include <IO/WriteBufferFromS3.h>
 #include <Storages/HDFS/WriteBufferFromHDFS.h>
+#include <IO/WriteBufferFromHTTP.h>
 
 
 namespace DB
@@ -65,6 +65,7 @@ template
 class WriteIndirectBufferFromRemoteFS<WriteBufferFromHDFS>;
 #endif
 
-}
+template
+class WriteIndirectBufferFromRemoteFS<WriteBufferFromHTTP>;
 
-#endif
+}

src/Disks/WriteIndirectBufferFromRemoteFS.h

@@ -4,8 +4,6 @@
 #include <Common/config.h>
 #endif
 
-#if USE_AWS_S3 || USE_HDFS
-
 #include <Disks/IDiskRemote.h>
 #include <IO/WriteBufferFromFile.h>
 #include <IO/WriteBufferFromFileDecorator.h>
@@ -38,5 +36,3 @@ private:
 };
 
 }
-
-#endif

src/Disks/registerDisks.cpp

@@ -24,6 +24,8 @@ void registerDiskEncrypted(DiskFactory & factory);
 void registerDiskHDFS(DiskFactory & factory);
 #endif
 
+void registerDiskWebServer(DiskFactory & factory);
+
 
 void registerDisks()
 {
@@ -43,6 +45,8 @@ void registerDisks()
 #if USE_HDFS
     registerDiskHDFS(factory);
 #endif
+
+    registerDiskWebServer(factory);
 }
 
 }

src/Disks/ya.make

@@ -16,6 +16,7 @@ SRCS(
     DiskMemory.cpp
     DiskRestartProxy.cpp
     DiskSelector.cpp
+    DiskWebServer.cpp
     IDisk.cpp
     IDiskRemote.cpp
     IVolume.cpp
@@ -23,6 +24,7 @@ SRCS(
     ReadIndirectBufferFromRemoteFS.cpp
     SingleDiskVolume.cpp
     StoragePolicy.cpp
+    TemporaryFileOnDisk.cpp
     VolumeJBOD.cpp
     VolumeRAID1.cpp
     WriteIndirectBufferFromRemoteFS.cpp

src/Disks/ya.make.in

@@ -7,7 +7,7 @@ PEERDIR(
 )
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -P 'S3|HDFS' | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | grep -v -P 'S3|HDFS' | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Formats/FormatFactory.cpp

@@ -161,14 +161,12 @@ InputFormatPtr FormatFactory::getInput(
     if (settings.max_memory_usage_for_user && settings.min_chunk_bytes_for_parallel_parsing * settings.max_threads * 2 > settings.max_memory_usage_for_user)
         parallel_parsing = false;
 
-    if (parallel_parsing && name == "JSONEachRow")
+    if (parallel_parsing)
     {
-        /// FIXME ParallelParsingBlockInputStream doesn't support formats with non-trivial readPrefix() and readSuffix()
+        const auto & non_trivial_prefix_and_suffix_checker = getCreators(name).non_trivial_prefix_and_suffix_checker;
-
+        /// Disable parallel parsing for input formats with non-trivial readPrefix() and readSuffix().
-        /// For JSONEachRow we can safely skip whitespace characters
+        if (non_trivial_prefix_and_suffix_checker && non_trivial_prefix_and_suffix_checker(buf))
-        skipWhitespaceIfAny(buf);
+            parallel_parsing = false;
-        if (buf.eof() || *buf.position() == '[')
-            parallel_parsing = false; /// Disable it for JSONEachRow if data is in square brackets (see JSONEachRowRowInputFormat)
     }
 
     if (parallel_parsing)
@@ -392,6 +390,14 @@ void FormatFactory::registerInputFormatProcessor(const String & name, InputProce
     target = std::move(input_creator);
 }
 
+void FormatFactory::registerNonTrivialPrefixAndSuffixChecker(const String & name, NonTrivialPrefixAndSuffixChecker non_trivial_prefix_and_suffix_checker)
+{
+    auto & target = dict[name].non_trivial_prefix_and_suffix_checker;
+    if (target)
+        throw Exception("FormatFactory: Non trivial prefix and suffix checker " + name + " is already registered", ErrorCodes::LOGICAL_ERROR);
+    target = std::move(non_trivial_prefix_and_suffix_checker);
+}
+
 void FormatFactory::registerOutputFormatProcessor(const String & name, OutputProcessorCreator output_creator)
 {
     auto & target = dict[name].output_processor_creator;

src/Formats/FormatFactory.h

@@ -93,6 +93,11 @@ private:
             const RowOutputFormatParams & params,
             const FormatSettings & settings)>;
 
+    /// Some input formats can have non trivial readPrefix() and readSuffix(),
+    /// so in some cases there is no possibility to use parallel parsing.
+    /// The checker should return true if parallel parsing should be disabled.
+    using NonTrivialPrefixAndSuffixChecker = std::function<bool(ReadBuffer & buf)>;
+
     struct Creators
     {
         InputCreator input_creator;
@@ -102,6 +107,7 @@ private:
         FileSegmentationEngine file_segmentation_engine;
         bool supports_parallel_formatting{false};
         bool is_column_oriented{false};
+        NonTrivialPrefixAndSuffixChecker non_trivial_prefix_and_suffix_checker;
     };
 
     using FormatsDictionary = std::unordered_map<String, Creators>;
@@ -166,6 +172,8 @@ public:
     void registerOutputFormat(const String & name, OutputCreator output_creator);
     void registerFileSegmentationEngine(const String & name, FileSegmentationEngine file_segmentation_engine);
 
+    void registerNonTrivialPrefixAndSuffixChecker(const String & name, NonTrivialPrefixAndSuffixChecker non_trivial_prefix_and_suffix_checker);
+
     void registerInputFormatProcessor(const String & name, InputProcessorCreator input_creator);
     void registerOutputFormatProcessor(const String & name, OutputProcessorCreator output_creator);
 

src/Formats/JSONEachRowUtils.cpp

@@ -87,4 +87,11 @@ std::pair<bool, size_t> fileSegmentationEngineJSONEachRowImpl(ReadBuffer & in, D
     return {loadAtPosition(in, memory, pos), number_of_rows};
 }
 
+bool nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl(ReadBuffer & buf)
+{
+    /// For JSONEachRow we can safely skip whitespace characters
+    skipWhitespaceIfAny(buf);
+    return buf.eof() || *buf.position() == '[';
+}
+
 }

src/Formats/JSONEachRowUtils.h

@@ -5,4 +5,6 @@ namespace DB
 
 std::pair<bool, size_t> fileSegmentationEngineJSONEachRowImpl(ReadBuffer & in, DB::Memory<> & memory, size_t min_chunk_size);
 
+bool nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl(ReadBuffer & buf);
+
 }

src/Formats/registerFormats.cpp

@@ -79,6 +79,9 @@ void registerInputFormatProcessorJSONAsString(FormatFactory & factory);
 void registerInputFormatProcessorLineAsString(FormatFactory & factory);
 void registerInputFormatProcessorCapnProto(FormatFactory & factory);
 
+/// Non trivial prefix and suffix checkers for disabling parallel parsing.
+void registerNonTrivialPrefixAndSuffixCheckerJSONEachRow(FormatFactory & factory);
+void registerNonTrivialPrefixAndSuffixCheckerJSONAsString(FormatFactory & factory);
 
 void registerFormats()
 {
@@ -153,6 +156,9 @@ void registerFormats()
 #if !defined(ARCADIA_BUILD)
     registerInputFormatProcessorCapnProto(factory);
 #endif
+
+    registerNonTrivialPrefixAndSuffixCheckerJSONEachRow(factory);
+    registerNonTrivialPrefixAndSuffixCheckerJSONAsString(factory);
 }
 
 }

src/Formats/ya.make.in

@@ -10,7 +10,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Functions/ya.make

@@ -290,6 +290,7 @@ SRCS(
     geohashesInBox.cpp
     getMacro.cpp
     getScalar.cpp
+    getServerPort.cpp
     getSetting.cpp
     getSizeOfEnumType.cpp
     globalVariable.cpp
@@ -444,6 +445,7 @@ SRCS(
     registerFunctionsNull.cpp
     registerFunctionsRandom.cpp
     registerFunctionsReinterpret.cpp
+    registerFunctionsSnowflake.cpp
     registerFunctionsString.cpp
     registerFunctionsStringRegexp.cpp
     registerFunctionsStringSearch.cpp
@@ -477,12 +479,14 @@ SRCS(
     s2RectIntersection.cpp
     s2RectUnion.cpp
     s2ToGeo.cpp
+    serverUUID.cpp
     sigmoid.cpp
     sign.cpp
     sin.cpp
     sinh.cpp
     sleep.cpp
     sleepEachRow.cpp
+    snowflake.cpp
     sqrt.cpp
     startsWith.cpp
     stem.cpp

src/IO/HTTPCommon.cpp

@@ -315,6 +315,7 @@ void assertResponseIsOk(const Poco::Net::HTTPRequest & request, Poco::Net::HTTPR
     if (!(status == Poco::Net::HTTPResponse::HTTP_OK
         || status == Poco::Net::HTTPResponse::HTTP_CREATED
         || status == Poco::Net::HTTPResponse::HTTP_ACCEPTED
+        || status == Poco::Net::HTTPResponse::HTTP_PARTIAL_CONTENT /// Reading with Range header was successful.
         || (isRedirect(status) && allow_redirects)))
     {
         std::stringstream error_message;        // STYLE_CHECK_ALLOW_STD_STRING_STREAM

src/IO/ya.make

@@ -56,6 +56,7 @@ SRCS(
     ReadBufferFromMemory.cpp
     ReadBufferFromPocoSocket.cpp
     ReadHelpers.cpp
+    ReadIndirectBufferFromWebServer.cpp
     SeekAvoidingReadBuffer.cpp
     TimeoutSetter.cpp
     UseSSL.cpp

src/IO/ya.make.in

@@ -18,7 +18,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -P 'S3|HDFS' | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | grep -v -P 'S3|HDFS' | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Interpreters/DatabaseCatalog.cpp

@@ -157,6 +157,15 @@ void DatabaseCatalog::loadDatabases()
     /// Another background thread which drops temporary LiveViews.
     /// We should start it after loadMarkedAsDroppedTables() to avoid race condition.
     TemporaryLiveViewCleaner::instance().startup();
+
+    /// Start up tables after all databases are loaded.
+    for (const auto & [database_name, database] : databases)
+    {
+        if (database_name == DatabaseCatalog::TEMPORARY_DATABASE)
+            continue;
+
+        database->startupTables();
+    }
 }
 
 void DatabaseCatalog::shutdownImpl()

src/Interpreters/InterpreterAlterQuery.cpp

@@ -32,6 +32,7 @@ namespace ErrorCodes
     extern const int LOGICAL_ERROR;
     extern const int INCORRECT_QUERY;
     extern const int NOT_IMPLEMENTED;
+    extern const int TABLE_IS_READ_ONLY;
 }
 
 
@@ -62,6 +63,8 @@ BlockIO InterpreterAlterQuery::execute()
     }
 
     StoragePtr table = DatabaseCatalog::instance().getTable(table_id, getContext());
+    if (table->isReadOnly())
+        throw Exception(ErrorCodes::TABLE_IS_READ_ONLY, "Table is read-only");
     auto alter_lock = table->lockForAlter(getContext()->getCurrentQueryId(), getContext()->getSettingsRef().lock_acquire_timeout);
     auto metadata_snapshot = table->getInMemoryMetadataPtr();
 

src/Interpreters/InterpreterCreateQuery.cpp

@@ -272,7 +272,8 @@ BlockIO InterpreterCreateQuery::createDatabase(ASTCreateQuery & create)
         }
 
         /// We use global context here, because storages lifetime is bigger than query context lifetime
-        database->loadStoredObjects(getContext()->getGlobalContext(), has_force_restore_data_flag, create.attach && force_attach); //-V560
+        database->loadStoredObjects(
+            getContext()->getGlobalContext(), has_force_restore_data_flag, create.attach && force_attach, skip_startup_tables); //-V560
     }
     catch (...)
     {

src/Interpreters/InterpreterCreateQuery.h

@@ -52,6 +52,11 @@ public:
         force_attach = force_attach_;
     }
 
+    void setSkipStartupTables(bool skip_startup_tables_)
+    {
+        skip_startup_tables = skip_startup_tables_;
+    }
+
     /// Obtain information about columns, their types, default values and column comments,
     ///  for case when columns in CREATE query is specified explicitly.
     static ColumnsDescription getColumnsDescription(const ASTExpressionList & columns, ContextPtr context, bool attach);
@@ -94,6 +99,7 @@ private:
     /// Is this an internal query - not from the user.
     bool internal = false;
     bool force_attach = false;
+    bool skip_startup_tables = false;
 
     mutable String as_database_saved;
     mutable String as_table_saved;

src/Interpreters/InterpreterDropQuery.cpp

@@ -34,6 +34,7 @@ namespace ErrorCodes
     extern const int UNKNOWN_TABLE;
     extern const int NOT_IMPLEMENTED;
     extern const int INCORRECT_QUERY;
+    extern const int TABLE_IS_READ_ONLY;
 }
 
 
@@ -162,6 +163,8 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
         if (query.kind == ASTDropQuery::Kind::Detach)
         {
             getContext()->checkAccess(drop_storage, table_id);
+            if (table->isReadOnly())
+                throw Exception(ErrorCodes::TABLE_IS_READ_ONLY, "Table is read-only");
 
             if (table->isDictionary())
             {
@@ -195,6 +198,8 @@ BlockIO InterpreterDropQuery::executeToTableImpl(ASTDropQuery & query, DatabaseP
                 throw Exception("Cannot TRUNCATE dictionary", ErrorCodes::SYNTAX_ERROR);
 
             getContext()->checkAccess(AccessType::TRUNCATE, table_id);
+            if (table->isReadOnly())
+                throw Exception(ErrorCodes::TABLE_IS_READ_ONLY, "Table is read-only");
 
             table->checkTableCanBeDropped();
 

src/Interpreters/Session.cpp

@@ -288,7 +288,7 @@ void Session::authenticate(const Credentials & credentials_, const Poco::Net::So
 #if defined(ARCADIA_BUILD)
     /// This is harmful field that is used only in foreign "Arcadia" build.
     if (const auto * basic_credentials = dynamic_cast<const BasicCredentials *>(&credentials_))
-        session_client_info->current_password = basic_credentials->getPassword();
+        prepared_client_info->current_password = basic_credentials->getPassword();
 #endif
 }
 

src/Interpreters/loadMetadata.cpp

@@ -43,6 +43,7 @@ static void executeCreateQuery(
     interpreter.setInternal(true);
     interpreter.setForceAttach(true);
     interpreter.setForceRestoreData(has_force_restore_data_flag);
+    interpreter.setSkipStartupTables(true);
     interpreter.execute();
 }
 

src/Interpreters/ya.make

@@ -70,6 +70,7 @@ SRCS(
     InJoinSubqueriesPreprocessor.cpp
     InternalTextLogsQueue.cpp
     InterpreterAlterQuery.cpp
+    InterpreterBackupQuery.cpp
     InterpreterCheckQuery.cpp
     InterpreterCreateFunctionQuery.cpp
     InterpreterCreateQuery.cpp
@@ -146,6 +147,7 @@ SRCS(
     RewriteSumIfFunctionVisitor.cpp
     RowRefs.cpp
     SelectIntersectExceptQueryVisitor.cpp
+    Session.cpp
     Set.cpp
     SetVariants.cpp
     SortedBlocksWriter.cpp

src/Parsers/ya.make

@@ -11,6 +11,7 @@ PEERDIR(
 SRCS(
     ASTAlterQuery.cpp
     ASTAsterisk.cpp
+    ASTBackupQuery.cpp
     ASTColumnDeclaration.cpp
     ASTColumnsMatcher.cpp
     ASTColumnsTransformers.cpp
@@ -51,6 +52,7 @@ SRCS(
     ASTRolesOrUsersSet.cpp
     ASTRowPolicyName.cpp
     ASTSampleRatio.cpp
+    ASTSelectIntersectExceptQuery.cpp
     ASTSelectQuery.cpp
     ASTSelectWithUnionQuery.cpp
     ASTSetQuery.cpp
@@ -89,6 +91,7 @@ SRCS(
     MySQL/ASTDeclareSubPartition.cpp
     MySQL/ASTDeclareTableOptions.cpp
     ParserAlterQuery.cpp
+    ParserBackupQuery.cpp
     ParserCase.cpp
     ParserCheckQuery.cpp
     ParserCreateFunctionQuery.cpp
@@ -142,6 +145,7 @@ SRCS(
     TokenIterator.cpp
     formatAST.cpp
     formatSettingName.cpp
+    getInsertQuery.cpp
     iostream_debug_helpers.cpp
     makeASTForLogicalFunction.cpp
     obfuscateQueries.cpp

src/Parsers/ya.make.in

@@ -8,7 +8,7 @@ PEERDIR(
 
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F New | grep -v -F tests | grep -v -F examples | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F New | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Processors/Formats/Impl/JSONAsStringRowInputFormat.cpp

@@ -34,6 +34,35 @@ void JSONAsStringRowInputFormat::resetParser()
     buf.reset();
 }
 
+void JSONAsStringRowInputFormat::readPrefix()
+{
+    /// In this format, BOM at beginning of stream cannot be confused with value, so it is safe to skip it.
+    skipBOMIfExists(buf);
+
+    skipWhitespaceIfAny(buf);
+    if (!buf.eof() && *buf.position() == '[')
+    {
+        ++buf.position();
+        data_in_square_brackets = true;
+    }
+}
+
+void JSONAsStringRowInputFormat::readSuffix()
+{
+    skipWhitespaceIfAny(buf);
+    if (data_in_square_brackets)
+    {
+        assertChar(']', buf);
+        skipWhitespaceIfAny(buf);
+    }
+    if (!buf.eof() && *buf.position() == ';')
+    {
+        ++buf.position();
+        skipWhitespaceIfAny(buf);
+    }
+    assertEOF(buf);
+}
+
 void JSONAsStringRowInputFormat::readJSONObject(IColumn & column)
 {
     PeekableReadBufferCheckpoint checkpoint{buf};
@@ -113,7 +142,23 @@ void JSONAsStringRowInputFormat::readJSONObject(IColumn & column)
 
 bool JSONAsStringRowInputFormat::readRow(MutableColumns & columns, RowReadExtension &)
 {
+    if (!allow_new_rows)
+        return false;
+
     skipWhitespaceIfAny(buf);
+    if (!buf.eof())
+    {
+        if (!data_in_square_brackets && *buf.position() == ';')
+        {
+            /// ';' means the end of query, but it cannot be before ']'.
+            return allow_new_rows = false;
+        }
+        else if (data_in_square_brackets && *buf.position() == ']')
+        {
+            /// ']' means the end of query.
+            return allow_new_rows = false;
+        }
+    }
 
     if (!buf.eof())
         readJSONObject(*columns[0]);
@@ -143,4 +188,9 @@ void registerFileSegmentationEngineJSONAsString(FormatFactory & factory)
     factory.registerFileSegmentationEngine("JSONAsString", &fileSegmentationEngineJSONEachRowImpl);
 }
 
+void registerNonTrivialPrefixAndSuffixCheckerJSONAsString(FormatFactory & factory)
+{
+    factory.registerNonTrivialPrefixAndSuffixChecker("JSONAsString", nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl);
+}
+
 }

src/Processors/Formats/Impl/JSONAsStringRowInputFormat.h

@@ -22,10 +22,17 @@ public:
     String getName() const override { return "JSONAsStringRowInputFormat"; }
     void resetParser() override;
 
+    void readPrefix() override;
+    void readSuffix() override;
+
 private:
     void readJSONObject(IColumn & column);
 
     PeekableReadBuffer buf;
+
+    /// This flag is needed to know if data is in square brackets.
+    bool data_in_square_brackets = false;
+    bool allow_new_rows = true;
 };
 
 }

src/Processors/Formats/Impl/JSONEachRowRowInputFormat.cpp

@@ -359,4 +359,10 @@ void registerFileSegmentationEngineJSONEachRow(FormatFactory & factory)
     factory.registerFileSegmentationEngine("JSONStringsEachRow", &fileSegmentationEngineJSONEachRowImpl);
 }
 
+void registerNonTrivialPrefixAndSuffixCheckerJSONEachRow(FormatFactory & factory)
+{
+    factory.registerNonTrivialPrefixAndSuffixChecker("JSONEachRow", nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl);
+    factory.registerNonTrivialPrefixAndSuffixChecker("JSONStringsEachRow", nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl);
+}
+
 }

src/Processors/ya.make

@@ -118,6 +118,7 @@ SRCS(
     QueryPlan/IQueryPlanStep.cpp
     QueryPlan/ISourceStep.cpp
     QueryPlan/ITransformingStep.cpp
+    QueryPlan/IntersectOrExceptStep.cpp
     QueryPlan/JoinStep.cpp
     QueryPlan/LimitByStep.cpp
     QueryPlan/LimitStep.cpp
@@ -165,6 +166,7 @@ SRCS(
     Transforms/FillingTransform.cpp
     Transforms/FilterTransform.cpp
     Transforms/FinishSortingTransform.cpp
+    Transforms/IntersectOrExceptTransform.cpp
     Transforms/JoiningTransform.cpp
     Transforms/LimitByTransform.cpp
     Transforms/LimitsCheckingTransform.cpp

src/Processors/ya.make.in

@@ -16,7 +16,7 @@ ADDINCL(
 CFLAGS(-DUSE_ARROW=1)
 
 SRCS(
-<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -P 'Avro|ORC|Parquet|CapnProto' | sed 's/^\.\//    /' | sort ?>
+<? find . -name '*.cpp' | grep -v -F tests | grep -v -F examples | grep -v -F fuzzers | grep -v -P 'Avro|ORC|Parquet|CapnProto' | sed 's/^\.\//    /' | sort ?>
 )
 
 END()

src/Storages/HDFS/ReadBufferFromHDFS.h

@@ -1,6 +1,8 @@
 #pragma once
 
-#include <Common/config.h>
+#if !defined(ARCADIA_BUILD)
+    #include <Common/config.h>
+#endif
 
 #if USE_HDFS
 #include <IO/ReadBuffer.h>

src/Storages/HDFS/WriteBufferFromHDFS.h

@@ -1,6 +1,8 @@
 #pragma once
 
-#include <Common/config.h>
+#if !defined(ARCADIA_BUILD)
+    #include <Common/config.h>
+#endif
 
 #if USE_HDFS
 #include <IO/WriteBuffer.h>
@@ -19,7 +21,7 @@ class WriteBufferFromHDFS final : public BufferWithOwnMemory<WriteBuffer>
 
 public:
     WriteBufferFromHDFS(
-        const std::string & hdfs_name_,
+        const String & hdfs_name_,
         const Poco::Util::AbstractConfiguration & config_,
         size_t buf_size_ = DBMS_DEFAULT_BUFFER_SIZE,
         int flags = O_WRONLY);

src/Storages/IStorage.cpp

@@ -201,6 +201,19 @@ NameDependencies IStorage::getDependentViewsByColumn(ContextPtr context) const
     return name_deps;
 }
 
+bool IStorage::isReadOnly() const
+{
+    auto storage_policy = getStoragePolicy();
+    if (storage_policy)
+    {
+        for (const auto & disk : storage_policy->getDisks())
+            if (!disk->isReadOnly())
+                return false;
+        return true;
+    }
+    return false;
+}
+
 BackupEntries IStorage::backup(const ASTs &, ContextPtr) const
 {
     throw Exception("Table engine " + getName() + " doesn't support backups", ErrorCodes::NOT_IMPLEMENTED);

src/Storages/IStorage.h

@@ -539,6 +539,9 @@ public:
     /// Returns storage policy if storage supports it.
     virtual StoragePolicyPtr getStoragePolicy() const { return {}; }
 
+    /// Returns true if all disks of storage are read-only.
+    virtual bool isReadOnly() const;
+
     /// If it is possible to quickly determine exact number of rows in the table at this moment of time, then return it.
     /// Used for:
     /// - Simple count() optimization

src/Storages/MergeTree/MergeTreeData.cpp

@@ -2593,6 +2593,8 @@ void MergeTreeData::tryRemovePartImmediately(DataPartPtr && part)
 
         LOG_TRACE(log, "Trying to immediately remove part {}", part->getNameWithState());
 
+        if (part->getState() != DataPartState::Temporary)
+        {
             auto it = data_parts_by_info.find(part->info);
             if (it == data_parts_by_info.end() || (*it).get() != part.get())
                 throw Exception("Part " + part->name + " doesn't exist", ErrorCodes::LOGICAL_ERROR);
@@ -2603,8 +2605,14 @@ void MergeTreeData::tryRemovePartImmediately(DataPartPtr && part)
                 return;
 
             modifyPartState(it, DataPartState::Deleting);
+
             part_to_delete = *it;
         }
+        else
+        {
+            part_to_delete = std::move(part);
+        }
+    }
 
     try
     {

src/Storages/MergeTree/MergeTreeDataMergerMutator.cpp

@@ -783,7 +783,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
     auto compression_codec = data.getCompressionCodecForPart(merge_entry->total_size_bytes_compressed, new_data_part->ttl_infos, time_of_merge);
 
     auto tmp_disk = context->getTemporaryVolume()->getDisk();
-    String rows_sources_file_path;
+    std::unique_ptr<TemporaryFile> rows_sources_file;
     std::unique_ptr<WriteBufferFromFileBase> rows_sources_uncompressed_write_buf;
     std::unique_ptr<WriteBuffer> rows_sources_write_buf;
     std::optional<ColumnSizeEstimator> column_sizes;
@@ -792,9 +792,8 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
 
     if (chosen_merge_algorithm == MergeAlgorithm::Vertical)
     {
-        tmp_disk->createDirectories(new_part_tmp_path);
+        rows_sources_file = createTemporaryFile(tmp_disk->getPath());
-        rows_sources_file_path = new_part_tmp_path + "rows_sources";
+        rows_sources_uncompressed_write_buf = tmp_disk->writeFile(fileName(rows_sources_file->path()));
-        rows_sources_uncompressed_write_buf = tmp_disk->writeFile(rows_sources_file_path);
         rows_sources_write_buf = std::make_unique<CompressedWriteBuffer>(*rows_sources_uncompressed_write_buf);
 
         MergeTreeData::DataPart::ColumnToSize merged_column_to_size;
@@ -1030,7 +1029,7 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
                 + ") differs from number of bytes written to rows_sources file (" + toString(rows_sources_count)
                 + "). It is a bug.", ErrorCodes::LOGICAL_ERROR);
 
-        CompressedReadBufferFromFile rows_sources_read_buf(tmp_disk->readFile(rows_sources_file_path));
+        CompressedReadBufferFromFile rows_sources_read_buf(tmp_disk->readFile(fileName(rows_sources_file->path())));
         IMergedBlockOutputStream::WrittenOffsetColumns written_offset_columns;
 
         for (size_t column_num = 0, gathering_column_names_size = gathering_column_names.size();
@@ -1101,8 +1100,6 @@ MergeTreeData::MutableDataPartPtr MergeTreeDataMergerMutator::mergePartsToTempor
             merge_entry->bytes_written_uncompressed += column_gathered_stream.getProfileInfo().bytes;
             merge_entry->progress.store(progress_before + column_sizes->columnWeight(column_name), std::memory_order_relaxed);
         }
-
-        tmp_disk->removeFile(rows_sources_file_path);
     }
 
     for (const auto & part : parts)