Library import 5, delete go dependencies (#832)

* Library import 5, delete go dependencies

* Fix yt client

1 files changed, 0 insertions, 1547 deletions

diff --git a/contrib/clickhouse/src/Databases/DatabaseReplicated.cpp b/contrib/clickhouse/src/Databases/DatabaseReplicated.cpp
deleted file mode 100644
index 17941d105ba..00000000000
--- a/contrib/clickhouse/src/Databases/DatabaseReplicated.cpp
+++ /dev/null
@@ -1,1547 +0,0 @@
-#include <DataTypes/DataTypeString.h>
-
-#include <utility>
-
-#include <Backups/IRestoreCoordination.h>
-#include <Backups/RestorerFromBackup.h>
-#include <base/chrono_io.h>
-#include <base/getFQDNOrHostName.h>
-#include <Common/Exception.h>
-#include <Common/Macros.h>
-#include <Common/OpenTelemetryTraceContext.h>
-#include <Common/ZooKeeper/KeeperException.h>
-#include <Common/ZooKeeper/Types.h>
-#include <Common/ZooKeeper/ZooKeeper.h>
-#include <Databases/DatabaseReplicated.h>
-#include <Databases/DatabaseReplicatedWorker.h>
-#include <Databases/DDLDependencyVisitor.h>
-#include <Databases/TablesDependencyGraph.h>
-#include <Interpreters/Cluster.h>
-#include <Interpreters/Context.h>
-#include <Interpreters/DDLTask.h>
-#include <Interpreters/evaluateConstantExpression.h>
-#include <Interpreters/executeDDLQueryOnCluster.h>
-#include <Interpreters/executeQuery.h>
-#include <Interpreters/InterpreterCreateQuery.h>
-#include <IO/ReadBufferFromFile.h>
-#include <IO/ReadBufferFromString.h>
-#include <IO/ReadHelpers.h>
-#include <IO/WriteHelpers.h>
-#include <Parsers/ASTAlterQuery.h>
-#include <Parsers/ASTDropQuery.h>
-#include <Parsers/ASTFunction.h>
-#include <Parsers/ASTDeleteQuery.h>
-#include <Parsers/formatAST.h>
-#include <Parsers/parseQuery.h>
-#include <Parsers/ParserCreateQuery.h>
-#include <Parsers/queryToString.h>
-#include <Storages/StorageKeeperMap.h>
-#include <Storages/AlterCommands.h>
-
-namespace DB
-{
-namespace ErrorCodes
-{
-    extern const int NO_ZOOKEEPER;
-    extern const int LOGICAL_ERROR;
-    extern const int BAD_ARGUMENTS;
-    extern const int REPLICA_ALREADY_EXISTS;
-    extern const int DATABASE_REPLICATION_FAILED;
-    extern const int UNKNOWN_DATABASE;
-    extern const int UNKNOWN_TABLE;
-    extern const int NOT_IMPLEMENTED;
-    extern const int INCORRECT_QUERY;
-    extern const int ALL_CONNECTION_TRIES_FAILED;
-    extern const int NO_ACTIVE_REPLICAS;
-    extern const int INCONSISTENT_METADATA_FOR_BACKUP;
-    extern const int CANNOT_RESTORE_TABLE;
-}
-
-static constexpr const char * REPLICATED_DATABASE_MARK = "DatabaseReplicated";
-static constexpr const char * DROPPED_MARK = "DROPPED";
-static constexpr const char * BROKEN_TABLES_SUFFIX = "_broken_tables";
-static constexpr const char * BROKEN_REPLICATED_TABLES_SUFFIX = "_broken_replicated_tables";
-
-static constexpr size_t METADATA_FILE_BUFFER_SIZE = 32768;
-
-zkutil::ZooKeeperPtr DatabaseReplicated::getZooKeeper() const
-{
-    return getContext()->getZooKeeper();
-}
-
-static inline String getHostID(ContextPtr global_context, const UUID & db_uuid)
-{
-    return Cluster::Address::toString(getFQDNOrHostName(), global_context->getTCPPort()) + ':' + toString(db_uuid);
-}
-
-static inline UInt64 getMetadataHash(const String & table_name, const String & metadata)
-{
-    SipHash hash;
-    hash.update(table_name);
-    hash.update(metadata);
-    return hash.get64();
-}
-
-DatabaseReplicated::~DatabaseReplicated() = default;
-
-DatabaseReplicated::DatabaseReplicated(
-    const String & name_,
-    const String & metadata_path_,
-    UUID uuid,
-    const String & zookeeper_path_,
-    const String & shard_name_,
-    const String & replica_name_,
-    DatabaseReplicatedSettings db_settings_,
-    ContextPtr context_)
-    : DatabaseAtomic(name_, metadata_path_, uuid, "DatabaseReplicated (" + name_ + ")", context_)
-    , zookeeper_path(zookeeper_path_)
-    , shard_name(shard_name_)
-    , replica_name(replica_name_)
-    , db_settings(std::move(db_settings_))
-    , tables_metadata_digest(0)
-{
-    if (zookeeper_path.empty() || shard_name.empty() || replica_name.empty())
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "ZooKeeper path, shard and replica names must be non-empty");
-    if (shard_name.find('/') != std::string::npos || replica_name.find('/') != std::string::npos)
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Shard and replica names should not contain '/'");
-    if (shard_name.find('|') != std::string::npos || replica_name.find('|') != std::string::npos)
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Shard and replica names should not contain '|'");
-
-    if (zookeeper_path.back() == '/')
-        zookeeper_path.resize(zookeeper_path.size() - 1);
-
-    /// If zookeeper chroot prefix is used, path should start with '/', because chroot concatenates without it.
-    if (zookeeper_path.front() != '/')
-        zookeeper_path = "/" + zookeeper_path;
-
-    if (!db_settings.collection_name.value.empty())
-        fillClusterAuthInfo(db_settings.collection_name.value, context_->getConfigRef());
-}
-
-String DatabaseReplicated::getFullReplicaName(const String & shard, const String & replica)
-{
-    return shard + '|' + replica;
-}
-
-String DatabaseReplicated::getFullReplicaName() const
-{
-    return getFullReplicaName(shard_name, replica_name);
-}
-
-std::pair<String, String> DatabaseReplicated::parseFullReplicaName(const String & name)
-{
-    String shard;
-    String replica;
-    auto pos = name.find('|');
-    if (pos == std::string::npos || name.find('|', pos + 1) != std::string::npos)
-        throw Exception(ErrorCodes::LOGICAL_ERROR, "Incorrect replica identifier: {}", name);
-    shard = name.substr(0, pos);
-    replica = name.substr(pos + 1);
-    return {shard, replica};
-}
-
-ClusterPtr DatabaseReplicated::tryGetCluster() const
-{
-    std::lock_guard lock{mutex};
-    if (cluster)
-        return cluster;
-
-    /// Database is probably not created or not initialized yet, it's ok to return nullptr
-    if (is_readonly)
-        return cluster;
-
-    try
-    {
-        /// A quick fix for stateless tests with DatabaseReplicated. Its ZK
-        /// node can be destroyed at any time. If another test lists
-        /// system.clusters to get client command line suggestions, it will
-        /// get an error when trying to get the info about DB from ZK.
-        /// Just ignore these inaccessible databases. A good example of a
-        /// failing test is `01526_client_start_and_exit`.
-        cluster = getClusterImpl();
-    }
-    catch (...)
-    {
-        tryLogCurrentException(log);
-    }
-    return cluster;
-}
-
-void DatabaseReplicated::setCluster(ClusterPtr && new_cluster)
-{
-    std::lock_guard lock{mutex};
-    cluster = std::move(new_cluster);
-}
-
-ClusterPtr DatabaseReplicated::getClusterImpl() const
-{
-    Strings hosts;
-    Strings host_ids;
-
-    auto zookeeper = getContext()->getZooKeeper();
-    constexpr int max_retries = 10;
-    int iteration = 0;
-    bool success = false;
-    while (++iteration <= max_retries)
-    {
-        host_ids.resize(0);
-        Coordination::Stat stat;
-        hosts = zookeeper->getChildren(zookeeper_path + "/replicas", &stat);
-        if (hosts.empty())
-            throw Exception(ErrorCodes::NO_ACTIVE_REPLICAS, "No replicas of database {} found. "
-                            "It's possible if the first replica is not fully created yet "
-                            "or if the last replica was just dropped or due to logical error", zookeeper_path);
-        Int32 cversion = stat.cversion;
-        ::sort(hosts.begin(), hosts.end());
-
-        std::vector<zkutil::ZooKeeper::FutureGet> futures;
-        futures.reserve(hosts.size());
-        host_ids.reserve(hosts.size());
-        for (const auto & host : hosts)
-            futures.emplace_back(zookeeper->asyncTryGet(zookeeper_path + "/replicas/" + host));
-
-        success = true;
-        for (auto & future : futures)
-        {
-            auto res = future.get();
-            if (res.error != Coordination::Error::ZOK)
-                success = false;
-            host_ids.emplace_back(res.data);
-        }
-
-        zookeeper->get(zookeeper_path + "/replicas", &stat);
-        if (cversion != stat.cversion)
-            success = false;
-        if (success)
-            break;
-    }
-    if (!success)
-        throw Exception(ErrorCodes::ALL_CONNECTION_TRIES_FAILED, "Cannot get consistent cluster snapshot,"
-                                                                 "because replicas are created or removed concurrently");
-
-    assert(!hosts.empty());
-    assert(hosts.size() == host_ids.size());
-    String current_shard = parseFullReplicaName(hosts.front()).first;
-    std::vector<std::vector<DatabaseReplicaInfo>> shards;
-    shards.emplace_back();
-    for (size_t i = 0; i < hosts.size(); ++i)
-    {
-        const auto & id = host_ids[i];
-        if (id == DROPPED_MARK)
-            continue;
-        auto [shard, replica] = parseFullReplicaName(hosts[i]);
-        auto pos = id.rfind(':');
-        String host_port = id.substr(0, pos);
-        if (shard != current_shard)
-        {
-            current_shard = shard;
-            if (!shards.back().empty())
-                shards.emplace_back();
-        }
-        String hostname = unescapeForFileName(host_port);
-        shards.back().push_back(DatabaseReplicaInfo{std::move(hostname), std::move(shard), std::move(replica)});
-    }
-
-    UInt16 default_port = getContext()->getTCPPort();
-
-    bool treat_local_as_remote = false;
-    bool treat_local_port_as_remote = getContext()->getApplicationType() == Context::ApplicationType::LOCAL;
-    ClusterConnectionParameters params{
-        cluster_auth_info.cluster_username,
-        cluster_auth_info.cluster_password,
-        default_port,
-        treat_local_as_remote,
-        treat_local_port_as_remote,
-        cluster_auth_info.cluster_secure_connection,
-        Priority{1},
-        TSA_SUPPRESS_WARNING_FOR_READ(database_name),     /// FIXME
-        cluster_auth_info.cluster_secret};
-
-    return std::make_shared<Cluster>(getContext()->getSettingsRef(), shards, params);
-}
-
-std::vector<UInt8> DatabaseReplicated::tryGetAreReplicasActive(const ClusterPtr & cluster_) const
-{
-    Strings paths;
-    const auto & addresses_with_failover = cluster_->getShardsAddresses();
-    const auto & shards_info = cluster_->getShardsInfo();
-    for (size_t shard_index = 0; shard_index < shards_info.size(); ++shard_index)
-    {
-        for (const auto & replica : addresses_with_failover[shard_index])
-        {
-            String full_name = getFullReplicaName(replica.database_shard_name, replica.database_replica_name);
-            paths.emplace_back(fs::path(zookeeper_path) / "replicas" / full_name / "active");
-        }
-    }
-
-    try
-    {
-        auto current_zookeeper = getZooKeeper();
-        auto res = current_zookeeper->exists(paths);
-
-        std::vector<UInt8> statuses;
-        statuses.resize(paths.size());
-
-        for (size_t i = 0; i < res.size(); ++i)
-            if (res[i].error == Coordination::Error::ZOK)
-                statuses[i] = 1;
-
-        return statuses;
-    }
-    catch (...)
-    {
-        tryLogCurrentException(log);
-        return {};
-    }
-}
-
-
-void DatabaseReplicated::fillClusterAuthInfo(String collection_name, const Poco::Util::AbstractConfiguration & config_ref)
-{
-    const auto & config_prefix = fmt::format("named_collections.{}", collection_name);
-
-    if (!config_ref.has(config_prefix))
-            throw Exception(ErrorCodes::BAD_ARGUMENTS, "There is no collection named `{}` in config", collection_name);
-
-    cluster_auth_info.cluster_username = config_ref.getString(config_prefix + ".cluster_username", "");
-    cluster_auth_info.cluster_password = config_ref.getString(config_prefix + ".cluster_password", "");
-    cluster_auth_info.cluster_secret = config_ref.getString(config_prefix + ".cluster_secret", "");
-    cluster_auth_info.cluster_secure_connection = config_ref.getBool(config_prefix + ".cluster_secure_connection", false);
-}
-
-void DatabaseReplicated::tryConnectToZooKeeperAndInitDatabase(LoadingStrictnessLevel mode)
-{
-    try
-    {
-        if (!getContext()->hasZooKeeper())
-        {
-            throw Exception(ErrorCodes::NO_ZOOKEEPER, "Can't create replicated database without ZooKeeper");
-        }
-
-        auto current_zookeeper = getContext()->getZooKeeper();
-
-        if (!current_zookeeper->exists(zookeeper_path))
-        {
-            /// Create new database, multiple nodes can execute it concurrently
-            createDatabaseNodesInZooKeeper(current_zookeeper);
-        }
-
-        replica_path = fs::path(zookeeper_path) / "replicas" / getFullReplicaName();
-        bool is_create_query = mode == LoadingStrictnessLevel::CREATE;
-
-        String replica_host_id;
-        if (current_zookeeper->tryGet(replica_path, replica_host_id))
-        {
-            if (replica_host_id == DROPPED_MARK && !is_create_query)
-            {
-                LOG_WARNING(log, "Database {} exists locally, but marked dropped in ZooKeeper ({}). "
-                                 "Will not try to start it up", getDatabaseName(), replica_path);
-                is_probably_dropped = true;
-                return;
-            }
-
-            String host_id = getHostID(getContext(), db_uuid);
-            if (is_create_query || replica_host_id != host_id)
-            {
-                throw Exception(
-                    ErrorCodes::REPLICA_ALREADY_EXISTS,
-                    "Replica {} of shard {} of replicated database at {} already exists. Replica host ID: '{}', current host ID: '{}'",
-                    replica_name, shard_name, zookeeper_path, replica_host_id, host_id);
-            }
-        }
-        else if (is_create_query)
-        {
-            /// Create new replica. Throws if replica with the same name already exists
-            createReplicaNodesInZooKeeper(current_zookeeper);
-        }
-        else
-        {
-            /// It's not CREATE query, but replica does not exist. Probably it was dropped.
-            /// Do not create anything, continue as readonly.
-            LOG_WARNING(log, "Database {} exists locally, but its replica does not exist in ZooKeeper ({}). "
-                             "Assuming it was dropped, will not try to start it up", getDatabaseName(), replica_path);
-            is_probably_dropped = true;
-            return;
-        }
-
-        is_readonly = false;
-    }
-    catch (...)
-    {
-        if (mode < LoadingStrictnessLevel::FORCE_ATTACH)
-            throw;
-
-        /// It's server startup, ignore error.
-        /// Worker thread will try to setup ZooKeeper connection
-        tryLogCurrentException(log);
-    }
-}
-
-bool DatabaseReplicated::createDatabaseNodesInZooKeeper(const zkutil::ZooKeeperPtr & current_zookeeper)
-{
-    current_zookeeper->createAncestors(zookeeper_path);
-
-    Coordination::Requests ops;
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path, REPLICATED_DATABASE_MARK, zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/log", "", zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/replicas", "", zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/counter", "", zkutil::CreateMode::Persistent));
-    /// We create and remove counter/cnt- node to increment sequential number of counter/ node and make log entry numbers start from 1.
-    /// New replicas are created with log pointer equal to 0 and log pointer is a number of the last executed entry.
-    /// It means that we cannot have log entry with number 0.
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/counter/cnt-", "", zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeRemoveRequest(zookeeper_path + "/counter/cnt-", -1));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/metadata", "", zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/max_log_ptr", "1", zkutil::CreateMode::Persistent));
-    ops.emplace_back(zkutil::makeCreateRequest(zookeeper_path + "/logs_to_keep", "1000", zkutil::CreateMode::Persistent));
-
-    Coordination::Responses responses;
-    auto res = current_zookeeper->tryMulti(ops, responses);
-    if (res == Coordination::Error::ZOK)
-        return true;    /// Created new database (it's the first replica)
-    if (res == Coordination::Error::ZNODEEXISTS)
-        return false;   /// Database exists, we will add new replica
-
-    /// Other codes are unexpected, will throw
-    zkutil::KeeperMultiException::check(res, ops, responses);
-    UNREACHABLE();
-}
-
-bool DatabaseReplicated::looksLikeReplicatedDatabasePath(const ZooKeeperPtr & current_zookeeper, const String & path)
-{
-    Coordination::Stat stat;
-    String maybe_database_mark;
-    if (!current_zookeeper->tryGet(path, maybe_database_mark, &stat))
-        return false;
-    if (maybe_database_mark.starts_with(REPLICATED_DATABASE_MARK))
-        return true;
-    if (!maybe_database_mark.empty())
-        return false;
-
-    /// Old versions did not have REPLICATED_DATABASE_MARK. Check specific nodes exist and add mark.
-    Coordination::Requests ops;
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/log", -1));
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/replicas", -1));
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/counter", -1));
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/metadata", -1));
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/max_log_ptr", -1));
-    ops.emplace_back(zkutil::makeCheckRequest(path + "/logs_to_keep", -1));
-    ops.emplace_back(zkutil::makeSetRequest(path, REPLICATED_DATABASE_MARK, stat.version));
-    Coordination::Responses responses;
-    auto res = current_zookeeper->tryMulti(ops, responses);
-    if (res == Coordination::Error::ZOK)
-        return true;
-
-    /// Recheck database mark (just in case of concurrent update).
-    if (!current_zookeeper->tryGet(path, maybe_database_mark, &stat))
-        return false;
-
-    return maybe_database_mark.starts_with(REPLICATED_DATABASE_MARK);
-}
-
-void DatabaseReplicated::createEmptyLogEntry(const ZooKeeperPtr & current_zookeeper)
-{
-    /// On replica creation add empty entry to log. Can be used to trigger some actions on other replicas (e.g. update cluster info).
-    DDLLogEntry entry{};
-    DatabaseReplicatedDDLWorker::enqueueQueryImpl(current_zookeeper, entry, this, true);
-}
-
-bool DatabaseReplicated::waitForReplicaToProcessAllEntries(UInt64 timeout_ms)
-{
-    if (!ddl_worker || is_probably_dropped)
-        return false;
-    return ddl_worker->waitForReplicaToProcessAllEntries(timeout_ms);
-}
-
-void DatabaseReplicated::createReplicaNodesInZooKeeper(const zkutil::ZooKeeperPtr & current_zookeeper)
-{
-    if (!looksLikeReplicatedDatabasePath(current_zookeeper, zookeeper_path))
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Cannot add new database replica: provided path {} "
-                        "already contains some data and it does not look like Replicated database path.", zookeeper_path);
-
-    /// Write host name to replica_path, it will protect from multiple replicas with the same name
-    auto host_id = getHostID(getContext(), db_uuid);
-
-    for (int attempts = 10; attempts > 0; --attempts)
-    {
-        Coordination::Stat stat;
-        String max_log_ptr_str = current_zookeeper->get(zookeeper_path + "/max_log_ptr", &stat);
-        Coordination::Requests ops;
-        ops.emplace_back(zkutil::makeCreateRequest(replica_path, host_id, zkutil::CreateMode::Persistent));
-        ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/log_ptr", "0", zkutil::CreateMode::Persistent));
-        ops.emplace_back(zkutil::makeCreateRequest(replica_path + "/digest", "0", zkutil::CreateMode::Persistent));
-        /// In addition to creating the replica nodes, we record the max_log_ptr at the instant where
-        /// we declared ourself as an existing replica. We'll need this during recoverLostReplica to
-        /// notify other nodes that issued new queries while this node was recovering.
-        ops.emplace_back(zkutil::makeCheckRequest(zookeeper_path + "/max_log_ptr", stat.version));
-        Coordination::Responses responses;
-        const auto code = current_zookeeper->tryMulti(ops, responses);
-        if (code == Coordination::Error::ZOK)
-        {
-            max_log_ptr_at_creation = parse<UInt32>(max_log_ptr_str);
-            break;
-        }
-        else if (code == Coordination::Error::ZNODEEXISTS || attempts == 1)
-        {
-            /// If its our last attempt, or if the replica already exists, fail immediately.
-            zkutil::KeeperMultiException::check(code, ops, responses);
-        }
-    }
-    createEmptyLogEntry(current_zookeeper);
-}
-
-void DatabaseReplicated::beforeLoadingMetadata(ContextMutablePtr /*context*/, LoadingStrictnessLevel mode)
-{
-    tryConnectToZooKeeperAndInitDatabase(mode);
-}
-
-void DatabaseReplicated::loadStoredObjects(ContextMutablePtr local_context, LoadingStrictnessLevel mode)
-{
-    beforeLoadingMetadata(local_context, mode);
-    DatabaseAtomic::loadStoredObjects(local_context, mode);
-}
-
-UInt64 DatabaseReplicated::getMetadataHash(const String & table_name) const
-{
-    return DB::getMetadataHash(table_name, readMetadataFile(table_name));
-}
-
-void DatabaseReplicated::startupTables(ThreadPool & thread_pool, LoadingStrictnessLevel mode)
-{
-    DatabaseAtomic::startupTables(thread_pool, mode);
-
-    /// TSA: No concurrent writes are possible during loading
-    UInt64 digest = 0;
-    for (const auto & table : TSA_SUPPRESS_WARNING_FOR_READ(tables))
-        digest += getMetadataHash(table.first);
-
-    LOG_DEBUG(log, "Calculated metadata digest of {} tables: {}", TSA_SUPPRESS_WARNING_FOR_READ(tables).size(), digest);
-    chassert(!TSA_SUPPRESS_WARNING_FOR_READ(tables_metadata_digest));
-    TSA_SUPPRESS_WARNING_FOR_WRITE(tables_metadata_digest) = digest;
-
-    if (is_probably_dropped)
-        return;
-
-    ddl_worker = std::make_unique<DatabaseReplicatedDDLWorker>(this, getContext());
-    ddl_worker->startup();
-    ddl_worker_initialized = true;
-}
-
-bool DatabaseReplicated::checkDigestValid(const ContextPtr & local_context, bool debug_check /* = true */) const
-{
-    if (debug_check)
-    {
-        /// Reduce number of debug checks
-        if (thread_local_rng() % 16)
-            return true;
-    }
-
-    LOG_TEST(log, "Current in-memory metadata digest: {}", tables_metadata_digest);
-
-    /// Database is probably being dropped
-    if (!local_context->getZooKeeperMetadataTransaction() && (!ddl_worker || !ddl_worker->isCurrentlyActive()))
-        return true;
-
-    UInt64 local_digest = 0;
-    {
-        std::lock_guard lock{mutex};
-        for (const auto & table : TSA_SUPPRESS_WARNING_FOR_READ(tables))
-            local_digest += getMetadataHash(table.first);
-    }
-
-    if (local_digest != tables_metadata_digest)
-    {
-        LOG_ERROR(log, "Digest of local metadata ({}) is not equal to in-memory digest ({})", local_digest, tables_metadata_digest);
-        return false;
-    }
-
-    /// Do not check digest in Keeper after internal subquery, it's probably not committed yet
-    if (local_context->isInternalSubquery())
-        return true;
-
-    /// Check does not make sense to check digest in Keeper during recovering
-    if (is_recovering)
-        return true;
-
-    String zk_digest = getZooKeeper()->get(replica_path + "/digest");
-    String local_digest_str = toString(local_digest);
-    if (zk_digest != local_digest_str)
-    {
-        LOG_ERROR(log, "Digest of local metadata ({}) is not equal to digest in Keeper ({})", local_digest_str, zk_digest);
-        return false;
-    }
-
-    return true;
-}
-
-void DatabaseReplicated::checkQueryValid(const ASTPtr & query, ContextPtr query_context) const
-{
-    /// Replicas will set correct name of current database in query context (database name can be different on replicas)
-    if (auto * ddl_query = dynamic_cast<ASTQueryWithTableAndOutput *>(query.get()))
-    {
-        if (ddl_query->getDatabase() != getDatabaseName())
-            throw Exception(ErrorCodes::UNKNOWN_DATABASE, "Database was renamed");
-        ddl_query->database.reset();
-
-        if (auto * create = query->as<ASTCreateQuery>())
-        {
-            bool replicated_table = create->storage && create->storage->engine && startsWith(create->storage->engine->name, "Replicated");
-            if (!replicated_table || !create->storage->engine->arguments)
-                return;
-
-            ASTs & args_ref = create->storage->engine->arguments->children;
-            ASTs args = args_ref;
-            if (args.size() < 2)
-                return;
-
-            /// It can be a constant expression. Try to evaluate it, ignore exception if we cannot.
-            bool has_expression_argument = args_ref[0]->as<ASTFunction>() || args_ref[1]->as<ASTFunction>();
-            if (has_expression_argument)
-            {
-                try
-                {
-                    args[0] = evaluateConstantExpressionAsLiteral(args_ref[0]->clone(), query_context);
-                    args[1] = evaluateConstantExpressionAsLiteral(args_ref[1]->clone(), query_context);
-                }
-                catch (...)
-                {
-                }
-            }
-
-            ASTLiteral * arg1 = args[0]->as<ASTLiteral>();
-            ASTLiteral * arg2 = args[1]->as<ASTLiteral>();
-            if (!arg1 || !arg2 || arg1->value.getType() != Field::Types::String || arg2->value.getType() != Field::Types::String)
-                return;
-
-            String maybe_path = arg1->value.get<String>();
-            String maybe_replica = arg2->value.get<String>();
-
-            /// Looks like it's ReplicatedMergeTree with explicit zookeeper_path and replica_name arguments.
-            /// Let's ensure that some macros are used.
-            /// NOTE: we cannot check here that substituted values will be actually different on shards and replicas.
-
-            Macros::MacroExpansionInfo info;
-            info.table_id = {getDatabaseName(), create->getTable(), create->uuid};
-            info.shard = getShardName();
-            info.replica = getReplicaName();
-            query_context->getMacros()->expand(maybe_path, info);
-            bool maybe_shard_macros = info.expanded_other;
-            info.expanded_other = false;
-            query_context->getMacros()->expand(maybe_replica, info);
-            bool maybe_replica_macros = info.expanded_other;
-            bool enable_functional_tests_helper = getContext()->getConfigRef().has("_functional_tests_helper_database_replicated_replace_args_macros");
-
-            if (!enable_functional_tests_helper)
-            {
-                if (query_context->getSettingsRef().database_replicated_allow_replicated_engine_arguments)
-                    LOG_WARNING(log, "It's not recommended to explicitly specify zookeeper_path and replica_name in ReplicatedMergeTree arguments");
-                else
-                    throw Exception(ErrorCodes::INCORRECT_QUERY,
-                                    "It's not allowed to specify explicit zookeeper_path and replica_name "
-                                    "for ReplicatedMergeTree arguments in Replicated database. If you really want to "
-                                    "specify them explicitly, enable setting "
-                                    "database_replicated_allow_replicated_engine_arguments.");
-            }
-
-            if (maybe_shard_macros && maybe_replica_macros)
-                return;
-
-            if (enable_functional_tests_helper && !has_expression_argument)
-            {
-                if (maybe_path.empty() || maybe_path.back() != '/')
-                    maybe_path += '/';
-                args_ref[0]->as<ASTLiteral>()->value = maybe_path + "auto_{shard}";
-                args_ref[1]->as<ASTLiteral>()->value = maybe_replica + "auto_{replica}";
-                return;
-            }
-
-            throw Exception(ErrorCodes::INCORRECT_QUERY,
-                            "Explicit zookeeper_path and replica_name are specified in ReplicatedMergeTree arguments. "
-                            "If you really want to specify it explicitly, then you should use some macros "
-                            "to distinguish different shards and replicas");
-        }
-    }
-
-    if (const auto * query_alter = query->as<ASTAlterQuery>())
-    {
-        for (const auto & command : query_alter->command_list->children)
-        {
-            if (!isSupportedAlterTypeForOnClusterDDLQuery(command->as<ASTAlterCommand&>().type))
-                throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Unsupported type of ALTER query");
-        }
-    }
-
-    if (auto * query_drop = query->as<ASTDropQuery>())
-    {
-        if (query_drop->kind == ASTDropQuery::Kind::Detach && query_context->getSettingsRef().database_replicated_always_detach_permanently)
-            query_drop->permanently = true;
-        if (query_drop->kind == ASTDropQuery::Kind::Detach && !query_drop->permanently)
-            throw Exception(ErrorCodes::INCORRECT_QUERY, "DETACH TABLE is not allowed for Replicated databases. "
-                                                         "Use DETACH TABLE PERMANENTLY or SYSTEM RESTART REPLICA or set "
-                                                         "database_replicated_always_detach_permanently to 1");
-    }
-}
-
-BlockIO DatabaseReplicated::tryEnqueueReplicatedDDL(const ASTPtr & query, ContextPtr query_context, bool internal)
-{
-
-    if (query_context->getCurrentTransaction() && query_context->getSettingsRef().throw_on_unsupported_query_inside_transaction)
-        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Distributed DDL queries inside transactions are not supported");
-
-    if (is_readonly)
-        throw Exception(ErrorCodes::NO_ZOOKEEPER, "Database is in readonly mode, because it cannot connect to ZooKeeper");
-
-    if (!internal && (query_context->getClientInfo().query_kind != ClientInfo::QueryKind::INITIAL_QUERY))
-        throw Exception(ErrorCodes::INCORRECT_QUERY, "It's not initial query. ON CLUSTER is not allowed for Replicated database.");
-
-    checkQueryValid(query, query_context);
-    LOG_DEBUG(log, "Proposing query: {}", queryToString(query));
-
-    DDLLogEntry entry;
-    entry.query = queryToString(query);
-    entry.initiator = ddl_worker->getCommonHostID();
-    entry.setSettingsIfRequired(query_context);
-    entry.tracing_context = OpenTelemetry::CurrentContext();
-    String node_path = ddl_worker->tryEnqueueAndExecuteEntry(entry, query_context);
-
-    Strings hosts_to_wait = getZooKeeper()->getChildren(zookeeper_path + "/replicas");
-    return getDistributedDDLStatus(node_path, entry, query_context, &hosts_to_wait);
-}
-
-static UUID getTableUUIDIfReplicated(const String & metadata, ContextPtr context)
-{
-    bool looks_like_replicated = metadata.find("Replicated") != std::string::npos;
-    bool looks_like_merge_tree = metadata.find("MergeTree") != std::string::npos;
-    if (!looks_like_replicated || !looks_like_merge_tree)
-        return UUIDHelpers::Nil;
-
-    ParserCreateQuery parser;
-    auto size = context->getSettingsRef().max_query_size;
-    auto depth = context->getSettingsRef().max_parser_depth;
-    ASTPtr query = parseQuery(parser, metadata, size, depth);
-    const ASTCreateQuery & create = query->as<const ASTCreateQuery &>();
-    if (!create.storage || !create.storage->engine)
-        return UUIDHelpers::Nil;
-    if (!startsWith(create.storage->engine->name, "Replicated") || !endsWith(create.storage->engine->name, "MergeTree"))
-        return UUIDHelpers::Nil;
-    chassert(create.uuid != UUIDHelpers::Nil);
-    return create.uuid;
-}
-
-void DatabaseReplicated::recoverLostReplica(const ZooKeeperPtr & current_zookeeper, UInt32 our_log_ptr, UInt32 & max_log_ptr)
-{
-    is_recovering = true;
-    SCOPE_EXIT({ is_recovering = false; });
-
-    /// Let's compare local (possibly outdated) metadata with (most actual) metadata stored in ZooKeeper
-    /// and try to update the set of local tables.
-    /// We could drop all local tables and create the new ones just like it's new replica.
-    /// But it will cause all ReplicatedMergeTree tables to fetch all data parts again and data in other tables will be lost.
-
-    bool new_replica = our_log_ptr == 0;
-    if (new_replica)
-        LOG_INFO(log, "Will create new replica from log pointer {}", max_log_ptr);
-    else
-        LOG_WARNING(log, "Will recover replica with staled log pointer {} from log pointer {}", our_log_ptr, max_log_ptr);
-
-    auto table_name_to_metadata = tryGetConsistentMetadataSnapshot(current_zookeeper, max_log_ptr);
-
-    /// For ReplicatedMergeTree tables we can compare only UUIDs to ensure that it's the same table.
-    /// Metadata can be different, it's handled on table replication level.
-    /// We need to handle renamed tables only.
-    /// TODO maybe we should also update MergeTree SETTINGS if required?
-    std::unordered_map<UUID, String> zk_replicated_id_to_name;
-    for (const auto & zk_table : table_name_to_metadata)
-    {
-        UUID zk_replicated_id = getTableUUIDIfReplicated(zk_table.second, getContext());
-        if (zk_replicated_id != UUIDHelpers::Nil)
-            zk_replicated_id_to_name.emplace(zk_replicated_id, zk_table.first);
-    }
-
-    /// We will drop or move tables which exist only in local metadata
-    Strings tables_to_detach;
-
-    struct RenameEdge
-    {
-        String from;
-        String intermediate;
-        String to;
-    };
-
-    /// This is needed to generate intermediate name
-    String salt = toString(thread_local_rng());
-
-    std::vector<RenameEdge> replicated_tables_to_rename;
-    size_t total_tables = 0;
-    std::vector<UUID> replicated_ids;
-    for (auto existing_tables_it = getTablesIterator(getContext(), {}); existing_tables_it->isValid();
-         existing_tables_it->next(), ++total_tables)
-    {
-        String name = existing_tables_it->name();
-        UUID local_replicated_id = UUIDHelpers::Nil;
-        if (existing_tables_it->table()->supportsReplication())
-        {
-            /// Check if replicated tables have the same UUID
-            local_replicated_id = existing_tables_it->table()->getStorageID().uuid;
-            auto it = zk_replicated_id_to_name.find(local_replicated_id);
-            if (it != zk_replicated_id_to_name.end())
-            {
-                if (name != it->second)
-                {
-                    String intermediate_name;
-                    /// Possibly we failed to rename it on previous iteration
-                    /// And this table was already renamed to an intermediate name
-                    if (startsWith(name, ".rename-") && !startsWith(it->second, ".rename-"))
-                        intermediate_name = name;
-                    else
-                        intermediate_name = fmt::format(".rename-{}-{}", name, sipHash64(fmt::format("{}-{}", name, salt)));
-                    /// Need just update table name
-                    replicated_tables_to_rename.push_back({name, intermediate_name, it->second});
-                }
-                continue;
-            }
-        }
-
-        auto in_zk = table_name_to_metadata.find(name);
-        if (in_zk == table_name_to_metadata.end() || in_zk->second != readMetadataFile(name))
-        {
-            /// Local table does not exist in ZooKeeper or has different metadata
-            tables_to_detach.emplace_back(std::move(name));
-        }
-    }
-
-    auto make_query_context = [this, current_zookeeper]()
-    {
-        auto query_context = Context::createCopy(getContext());
-        query_context->makeQueryContext();
-        query_context->setQueryKind(ClientInfo::QueryKind::SECONDARY_QUERY);
-        query_context->setQueryKindReplicatedDatabaseInternal();
-        query_context->setCurrentDatabase(getDatabaseName());
-        query_context->setCurrentQueryId("");
-
-        /// We will execute some CREATE queries for recovery (not ATTACH queries),
-        /// so we need to allow experimental features that can be used in a CREATE query
-        query_context->setSetting("allow_experimental_inverted_index", 1);
-        query_context->setSetting("allow_experimental_codecs", 1);
-        query_context->setSetting("allow_experimental_live_view", 1);
-        query_context->setSetting("allow_experimental_window_view", 1);
-        query_context->setSetting("allow_experimental_funnel_functions", 1);
-        query_context->setSetting("allow_experimental_nlp_functions", 1);
-        query_context->setSetting("allow_experimental_hash_functions", 1);
-        query_context->setSetting("allow_experimental_object_type", 1);
-        query_context->setSetting("allow_experimental_annoy_index", 1);
-        query_context->setSetting("allow_experimental_usearch_index", 1);
-        query_context->setSetting("allow_experimental_bigint_types", 1);
-        query_context->setSetting("allow_experimental_window_functions", 1);
-        query_context->setSetting("allow_experimental_geo_types", 1);
-        query_context->setSetting("allow_experimental_map_type", 1);
-
-        query_context->setSetting("allow_suspicious_low_cardinality_types", 1);
-        query_context->setSetting("allow_suspicious_fixed_string_types", 1);
-        query_context->setSetting("allow_suspicious_indices", 1);
-        query_context->setSetting("allow_suspicious_codecs", 1);
-        query_context->setSetting("allow_hyperscan", 1);
-        query_context->setSetting("allow_simdjson", 1);
-        query_context->setSetting("allow_deprecated_syntax_for_merge_tree", 1);
-
-        auto txn = std::make_shared<ZooKeeperMetadataTransaction>(current_zookeeper, zookeeper_path, false, "");
-        query_context->initZooKeeperMetadataTransaction(txn);
-        return query_context;
-    };
-
-    String db_name = getDatabaseName();
-    String to_db_name = getDatabaseName() + BROKEN_TABLES_SUFFIX;
-    String to_db_name_replicated = getDatabaseName() + BROKEN_REPLICATED_TABLES_SUFFIX;
-    if (total_tables * db_settings.max_broken_tables_ratio < tables_to_detach.size())
-        throw Exception(ErrorCodes::DATABASE_REPLICATION_FAILED, "Too many tables to recreate: {} of {}", tables_to_detach.size(), total_tables);
-    else if (!tables_to_detach.empty())
-    {
-        LOG_WARNING(log, "Will recreate {} broken tables to recover replica", tables_to_detach.size());
-        /// It's too dangerous to automatically drop tables, so we will move them to special database.
-        /// We use Ordinary engine for destination database, because it's the only way to discard table UUID
-        /// and make possible creation of new table with the same UUID.
-        String query = fmt::format("CREATE DATABASE IF NOT EXISTS {} ENGINE=Ordinary", backQuoteIfNeed(to_db_name));
-        auto query_context = Context::createCopy(getContext());
-        query_context->setSetting("allow_deprecated_database_ordinary", 1);
-        executeQuery(query, query_context, true);
-
-        /// But we want to avoid discarding UUID of ReplicatedMergeTree tables, because it will not work
-        /// if zookeeper_path contains {uuid} macro. Replicated database do not recreate replicated tables on recovery,
-        /// so it's ok to save UUID of replicated table.
-        query = fmt::format("CREATE DATABASE IF NOT EXISTS {} ENGINE=Atomic", backQuoteIfNeed(to_db_name_replicated));
-        query_context = Context::createCopy(getContext());
-        executeQuery(query, query_context, true);
-    }
-
-    size_t moved_tables = 0;
-    std::vector<UUID> dropped_tables;
-    size_t dropped_dictionaries = 0;
-
-    for (const auto & table_name : tables_to_detach)
-    {
-        DDLGuardPtr table_guard = DatabaseCatalog::instance().getDDLGuard(db_name, table_name);
-        if (getDatabaseName() != db_name)
-            throw Exception(ErrorCodes::UNKNOWN_DATABASE, "Database was renamed, will retry");
-
-        auto table = tryGetTable(table_name, getContext());
-
-        auto move_table_to_database = [&](const String & broken_table_name, const String & to_database_name)
-        {
-            /// Table probably stores some data. Let's move it to another database.
-            String to_name = fmt::format("{}_{}_{}", broken_table_name, max_log_ptr, thread_local_rng() % 1000);
-            LOG_DEBUG(log, "Will RENAME TABLE {} TO {}.{}", backQuoteIfNeed(broken_table_name), backQuoteIfNeed(to_database_name), backQuoteIfNeed(to_name));
-            assert(db_name < to_database_name);
-            DDLGuardPtr to_table_guard = DatabaseCatalog::instance().getDDLGuard(to_database_name, to_name);
-            auto to_db_ptr = DatabaseCatalog::instance().getDatabase(to_database_name);
-
-            std::lock_guard lock{metadata_mutex};
-            UInt64 new_digest = tables_metadata_digest;
-            new_digest -= getMetadataHash(broken_table_name);
-            DatabaseAtomic::renameTable(make_query_context(), broken_table_name, *to_db_ptr, to_name, /* exchange */ false, /* dictionary */ false);
-            tables_metadata_digest = new_digest;
-            assert(checkDigestValid(getContext()));
-            ++moved_tables;
-        };
-
-        if (!table->storesDataOnDisk())
-        {
-            LOG_DEBUG(log, "Will DROP TABLE {}, because it does not store data on disk and can be safely dropped", backQuoteIfNeed(table_name));
-            dropped_tables.push_back(tryGetTableUUID(table_name));
-            dropped_dictionaries += table->isDictionary();
-            table->flushAndShutdown();
-
-            if (table->getName() == "MaterializedView" || table->getName() == "WindowView")
-            {
-                /// We have to drop MV inner table, so MV will not try to do it implicitly breaking some invariants.
-                /// Also we have to commit metadata transaction, because it's not committed by default for inner tables of MVs.
-                /// Yep, I hate inner tables of materialized views.
-                auto mv_drop_inner_table_context = make_query_context();
-                table->dropInnerTableIfAny(/* sync */ true, mv_drop_inner_table_context);
-                mv_drop_inner_table_context->getZooKeeperMetadataTransaction()->commit();
-            }
-
-            std::lock_guard lock{metadata_mutex};
-            UInt64 new_digest = tables_metadata_digest;
-            new_digest -= getMetadataHash(table_name);
-            DatabaseAtomic::dropTableImpl(make_query_context(), table_name, /* sync */ true);
-            tables_metadata_digest = new_digest;
-            assert(checkDigestValid(getContext()));
-        }
-        else if (!table->supportsReplication())
-        {
-            move_table_to_database(table_name, to_db_name);
-        }
-        else
-        {
-            move_table_to_database(table_name, to_db_name_replicated);
-        }
-    }
-
-    if (!tables_to_detach.empty())
-        LOG_WARNING(log, "Cleaned {} outdated objects: dropped {} dictionaries and {} tables, moved {} tables",
-                    tables_to_detach.size(), dropped_dictionaries, dropped_tables.size() - dropped_dictionaries, moved_tables);
-
-    /// Now database is cleared from outdated tables, let's rename ReplicatedMergeTree tables to actual names
-    /// We have to take into account that tables names could be changed with two general queries
-    /// 1) RENAME TABLE. There could be multiple pairs of tables (e.g. RENAME b TO c, a TO b, c TO d)
-    /// But it is equal to multiple subsequent RENAMEs each of which operates only with two tables
-    /// 2) EXCHANGE TABLE. This query swaps two names atomically and could not be represented with two separate RENAMEs
-    auto rename_table = [&](String from, String to)
-    {
-        LOG_DEBUG(log, "Will RENAME TABLE {} TO {}", backQuoteIfNeed(from), backQuoteIfNeed(to));
-        DDLGuardPtr table_guard = DatabaseCatalog::instance().getDDLGuard(db_name, std::min(from, to));
-        DDLGuardPtr to_table_guard = DatabaseCatalog::instance().getDDLGuard(db_name, std::max(from, to));
-
-        std::lock_guard lock{metadata_mutex};
-        UInt64 new_digest = tables_metadata_digest;
-        String statement = readMetadataFile(from);
-        new_digest -= DB::getMetadataHash(from, statement);
-        new_digest += DB::getMetadataHash(to, statement);
-        DatabaseAtomic::renameTable(make_query_context(), from, *this, to, false, false);
-        tables_metadata_digest = new_digest;
-        assert(checkDigestValid(getContext()));
-    };
-
-    LOG_DEBUG(log, "Starting first stage of renaming process. Will rename tables to intermediate names");
-    for (auto & [from, intermediate, _] : replicated_tables_to_rename)
-    {
-        /// Due to some unknown failures there could be tables
-        /// which are already in an intermediate state
-        /// For them we skip the first stage
-        if (from == intermediate)
-            continue;
-        rename_table(from, intermediate);
-    }
-    LOG_DEBUG(log, "Starting second stage of renaming process. Will rename tables from intermediate to desired names");
-    for (auto & [_, intermediate, to] : replicated_tables_to_rename)
-        rename_table(intermediate, to);
-
-    LOG_DEBUG(log, "Renames completed succesessfully");
-
-    for (const auto & id : dropped_tables)
-        DatabaseCatalog::instance().waitTableFinallyDropped(id);
-
-
-    /// Create all needed tables in a proper order
-    TablesDependencyGraph tables_dependencies("DatabaseReplicated (" + getDatabaseName() + ")");
-    for (const auto & [table_name, create_table_query] : table_name_to_metadata)
-    {
-        /// Note that table_name could contain a dot inside (e.g. .inner.1234-1234-1234-1234)
-        /// And QualifiedTableName::parseFromString doesn't handle this.
-        auto qualified_name = QualifiedTableName{.database = getDatabaseName(), .table = table_name};
-        auto query_ast = parseQueryFromMetadataInZooKeeper(table_name, create_table_query);
-        tables_dependencies.addDependencies(qualified_name, getDependenciesFromCreateQuery(getContext(), qualified_name, query_ast));
-    }
-
-    tables_dependencies.checkNoCyclicDependencies();
-    auto tables_to_create = tables_dependencies.getTablesSortedByDependency();
-
-    for (const auto & table_id : tables_to_create)
-    {
-        auto table_name = table_id.getTableName();
-        auto metadata_it = table_name_to_metadata.find(table_name);
-        if (metadata_it == table_name_to_metadata.end())
-        {
-            /// getTablesSortedByDependency() may return some not existing tables or tables from other databases
-            LOG_WARNING(log, "Got table name {} when resolving table dependencies, "
-                        "but database {} does not have metadata for that table. Ignoring it", table_id.getNameForLogs(), getDatabaseName());
-            continue;
-        }
-
-        const auto & create_query_string = metadata_it->second;
-        if (isTableExist(table_name, getContext()))
-        {
-            assert(create_query_string == readMetadataFile(table_name) || getTableUUIDIfReplicated(create_query_string, getContext()) != UUIDHelpers::Nil);
-            continue;
-        }
-
-        auto query_ast = parseQueryFromMetadataInZooKeeper(table_name, create_query_string);
-        LOG_INFO(log, "Executing {}", serializeAST(*query_ast));
-        auto create_query_context = make_query_context();
-        InterpreterCreateQuery(query_ast, create_query_context).execute();
-    }
-    LOG_INFO(log, "All tables are created successfully");
-
-    if (max_log_ptr_at_creation != 0)
-    {
-        /// If the replica is new and some of the queries applied during recovery
-        /// where issued after the replica was created, then other nodes might be
-        /// waiting for this node to notify them that the query was applied.
-        for (UInt32 ptr = max_log_ptr_at_creation; ptr <= max_log_ptr; ++ptr)
-        {
-            auto entry_name = DDLTaskBase::getLogEntryName(ptr);
-            auto path = fs::path(zookeeper_path) / "log" / entry_name / "finished" / getFullReplicaName();
-            auto status = ExecutionStatus(0).serializeText();
-            auto res = current_zookeeper->tryCreate(path, status, zkutil::CreateMode::Persistent);
-            if (res == Coordination::Error::ZOK)
-                LOG_INFO(log, "Marked recovered {} as finished", entry_name);
-        }
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    chassert(checkDigestValid(getContext()));
-    current_zookeeper->set(replica_path + "/digest", toString(tables_metadata_digest));
-}
-
-std::map<String, String> DatabaseReplicated::tryGetConsistentMetadataSnapshot(const ZooKeeperPtr & zookeeper, UInt32 & max_log_ptr)
-{
-    std::map<String, String> table_name_to_metadata;
-    constexpr int max_retries = 10;
-    int iteration = 0;
-    while (++iteration <= max_retries)
-    {
-        table_name_to_metadata.clear();
-        LOG_DEBUG(log, "Trying to get consistent metadata snapshot for log pointer {}", max_log_ptr);
-        Strings table_names = zookeeper->getChildren(zookeeper_path + "/metadata");
-
-        std::vector<zkutil::ZooKeeper::FutureGet> futures;
-        futures.reserve(table_names.size());
-        for (const auto & table : table_names)
-            futures.emplace_back(zookeeper->asyncTryGet(zookeeper_path + "/metadata/" + table));
-
-        for (size_t i = 0; i < table_names.size(); ++i)
-        {
-            auto res = futures[i].get();
-            if (res.error != Coordination::Error::ZOK)
-                break;
-            table_name_to_metadata.emplace(unescapeForFileName(table_names[i]), res.data);
-        }
-
-        UInt32 new_max_log_ptr = parse<UInt32>(zookeeper->get(zookeeper_path + "/max_log_ptr"));
-        if (new_max_log_ptr == max_log_ptr && table_names.size() == table_name_to_metadata.size())
-            break;
-
-        if (max_log_ptr < new_max_log_ptr)
-        {
-            LOG_DEBUG(log, "Log pointer moved from {} to {}, will retry", max_log_ptr, new_max_log_ptr);
-            max_log_ptr = new_max_log_ptr;
-        }
-        else
-        {
-            chassert(max_log_ptr == new_max_log_ptr);
-            chassert(table_names.size() != table_name_to_metadata.size());
-            LOG_DEBUG(log, "Cannot get metadata of some tables due to ZooKeeper error, will retry");
-        }
-    }
-
-    if (max_retries < iteration)
-        throw Exception(ErrorCodes::DATABASE_REPLICATION_FAILED, "Cannot get consistent metadata snapshot");
-
-    LOG_DEBUG(log, "Got consistent metadata snapshot for log pointer {}", max_log_ptr);
-
-    return table_name_to_metadata;
-}
-
-ASTPtr DatabaseReplicated::parseQueryFromMetadataInZooKeeper(const String & node_name, const String & query)
-{
-    ParserCreateQuery parser;
-    String description = "in ZooKeeper " + zookeeper_path + "/metadata/" + node_name;
-    auto ast = parseQuery(parser, query, description, 0, getContext()->getSettingsRef().max_parser_depth);
-
-    auto & create = ast->as<ASTCreateQuery &>();
-    if (create.uuid == UUIDHelpers::Nil || create.getTable() != TABLE_WITH_UUID_NAME_PLACEHOLDER || create.database)
-        throw Exception(ErrorCodes::LOGICAL_ERROR, "Got unexpected query from {}: {}", node_name, query);
-
-    bool is_materialized_view_with_inner_table = create.is_materialized_view && create.to_table_id.empty();
-
-    create.setDatabase(getDatabaseName());
-    create.setTable(unescapeForFileName(node_name));
-    create.attach = is_materialized_view_with_inner_table;
-
-    return ast;
-}
-
-void DatabaseReplicated::dropReplica(
-    DatabaseReplicated * database, const String & database_zookeeper_path, const String & shard, const String & replica)
-{
-    assert(!database || database_zookeeper_path == database->zookeeper_path);
-
-    String full_replica_name = shard.empty() ? replica : getFullReplicaName(shard, replica);
-
-    if (full_replica_name.find('/') != std::string::npos)
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Invalid replica name, '/' is not allowed: {}", full_replica_name);
-
-    auto zookeeper = Context::getGlobalContextInstance()->getZooKeeper();
-
-    String database_mark = zookeeper->get(database_zookeeper_path);
-    if (database_mark != REPLICATED_DATABASE_MARK)
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Path {} does not look like a path of Replicated database", database_zookeeper_path);
-
-    String database_replica_path = fs::path(database_zookeeper_path) / "replicas" / full_replica_name;
-    if (!zookeeper->exists(database_replica_path))
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Replica {} does not exist (database path: {})",
-                        full_replica_name, database_zookeeper_path);
-
-    if (zookeeper->exists(database_replica_path + "/active"))
-        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Replica {} is active, cannot drop it (database path: {})",
-                        full_replica_name, database_zookeeper_path);
-
-    zookeeper->set(database_replica_path, DROPPED_MARK, -1);
-    /// Notify other replicas that cluster configuration was changed (if we can)
-    if (database)
-        database->createEmptyLogEntry(zookeeper);
-
-    zookeeper->tryRemoveRecursive(database_replica_path);
-    if (zookeeper->tryRemove(database_zookeeper_path + "/replicas") == Coordination::Error::ZOK)
-    {
-        /// It was the last replica, remove all metadata
-        zookeeper->tryRemoveRecursive(database_zookeeper_path);
-    }
-}
-
-void DatabaseReplicated::drop(ContextPtr context_)
-{
-    if (is_probably_dropped)
-    {
-        /// Don't need to drop anything from ZooKeeper
-        DatabaseAtomic::drop(context_);
-        return;
-    }
-
-    auto current_zookeeper = getZooKeeper();
-    current_zookeeper->set(replica_path, DROPPED_MARK, -1);
-    createEmptyLogEntry(current_zookeeper);
-
-    DatabaseAtomic::drop(context_);
-
-    current_zookeeper->tryRemoveRecursive(replica_path);
-    /// TODO it may leave garbage in ZooKeeper if the last node lost connection here
-    if (current_zookeeper->tryRemove(zookeeper_path + "/replicas") == Coordination::Error::ZOK)
-    {
-        /// It was the last replica, remove all metadata
-        current_zookeeper->tryRemoveRecursive(zookeeper_path);
-    }
-}
-
-void DatabaseReplicated::stopReplication()
-{
-    if (ddl_worker)
-        ddl_worker->shutdown();
-}
-
-void DatabaseReplicated::shutdown()
-{
-    stopReplication();
-    ddl_worker_initialized = false;
-    ddl_worker = nullptr;
-    DatabaseAtomic::shutdown();
-}
-
-
-void DatabaseReplicated::dropTable(ContextPtr local_context, const String & table_name, bool sync)
-{
-    auto txn = local_context->getZooKeeperMetadataTransaction();
-    assert(!ddl_worker || !ddl_worker->isCurrentlyActive() || txn || startsWith(table_name, ".inner_id."));
-    if (txn && txn->isInitialQuery() && !txn->isCreateOrReplaceQuery())
-    {
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
-        txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
-    }
-
-    auto table = tryGetTable(table_name, getContext());
-    if (table->getName() == "MaterializedView" || table->getName() == "WindowView")
-    {
-        /// Avoid recursive locking of metadata_mutex
-        table->dropInnerTableIfAny(sync, local_context);
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    new_digest -= getMetadataHash(table_name);
-    if (txn && !txn->isCreateOrReplaceQuery() && !is_recovering)
-        txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-
-    DatabaseAtomic::dropTableImpl(local_context, table_name, sync);
-    tables_metadata_digest = new_digest;
-
-    assert(checkDigestValid(local_context));
-}
-
-void DatabaseReplicated::renameTable(ContextPtr local_context, const String & table_name, IDatabase & to_database,
-                                     const String & to_table_name, bool exchange, bool dictionary)
-{
-    auto txn = local_context->getZooKeeperMetadataTransaction();
-    assert(txn);
-
-    if (this != &to_database)
-        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Moving tables between databases is not supported for Replicated engine");
-    if (table_name == to_table_name)
-        throw Exception(ErrorCodes::INCORRECT_QUERY, "Cannot rename table to itself");
-    if (!isTableExist(table_name, local_context))
-        throw Exception(ErrorCodes::UNKNOWN_TABLE, "Table {} does not exist", table_name);
-    if (exchange && !to_database.isTableExist(to_table_name, local_context))
-        throw Exception(ErrorCodes::UNKNOWN_TABLE, "Table {} does not exist", to_table_name);
-
-    String statement = readMetadataFile(table_name);
-    String statement_to;
-    if (exchange)
-        statement_to = readMetadataFile(to_table_name);
-
-    if (txn->isInitialQuery())
-    {
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
-        String metadata_zk_path_to = zookeeper_path + "/metadata/" + escapeForFileName(to_table_name);
-        if (!txn->isCreateOrReplaceQuery())
-            txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
-
-        if (exchange)
-        {
-            txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path_to, -1));
-            if (!txn->isCreateOrReplaceQuery())
-                txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement_to, zkutil::CreateMode::Persistent));
-        }
-        txn->addOp(zkutil::makeCreateRequest(metadata_zk_path_to, statement, zkutil::CreateMode::Persistent));
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    new_digest -= DB::getMetadataHash(table_name, statement);
-    new_digest += DB::getMetadataHash(to_table_name, statement);
-    if (exchange)
-    {
-        new_digest -= DB::getMetadataHash(to_table_name, statement_to);
-        new_digest += DB::getMetadataHash(table_name, statement_to);
-    }
-    if (txn && !is_recovering)
-        txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-
-    DatabaseAtomic::renameTable(local_context, table_name, to_database, to_table_name, exchange, dictionary);
-    tables_metadata_digest = new_digest;
-    assert(checkDigestValid(local_context));
-}
-
-void DatabaseReplicated::commitCreateTable(const ASTCreateQuery & query, const StoragePtr & table,
-                       const String & table_metadata_tmp_path, const String & table_metadata_path,
-                       ContextPtr query_context)
-{
-    auto txn = query_context->getZooKeeperMetadataTransaction();
-    assert(!ddl_worker->isCurrentlyActive() || txn);
-
-    String statement = getObjectDefinitionFromCreateQuery(query.clone());
-    if (txn && txn->isInitialQuery() && !txn->isCreateOrReplaceQuery())
-    {
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(query.getTable());
-        /// zk::multi(...) will throw if `metadata_zk_path` exists
-        txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement, zkutil::CreateMode::Persistent));
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    new_digest += DB::getMetadataHash(query.getTable(), statement);
-    if (txn && !txn->isCreateOrReplaceQuery() && !is_recovering)
-        txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-
-    DatabaseAtomic::commitCreateTable(query, table, table_metadata_tmp_path, table_metadata_path, query_context);
-    tables_metadata_digest = new_digest;
-    assert(checkDigestValid(query_context));
-}
-
-void DatabaseReplicated::commitAlterTable(const StorageID & table_id,
-                                          const String & table_metadata_tmp_path, const String & table_metadata_path,
-                                          const String & statement, ContextPtr query_context)
-{
-    auto txn = query_context->getZooKeeperMetadataTransaction();
-    assert(!ddl_worker || !ddl_worker->isCurrentlyActive() || txn);
-    if (txn && txn->isInitialQuery())
-    {
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_id.table_name);
-        txn->addOp(zkutil::makeSetRequest(metadata_zk_path, statement, -1));
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    new_digest -= getMetadataHash(table_id.table_name);
-    new_digest += DB::getMetadataHash(table_id.table_name, statement);
-    if (txn && !is_recovering)
-        txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-
-    DatabaseAtomic::commitAlterTable(table_id, table_metadata_tmp_path, table_metadata_path, statement, query_context);
-    tables_metadata_digest = new_digest;
-    assert(checkDigestValid(query_context));
-}
-
-
-bool DatabaseReplicated::canExecuteReplicatedMetadataAlter() const
-{
-    /// ReplicatedMergeTree may call commitAlterTable from its background threads when executing ALTER_METADATA entries.
-    /// It may update the metadata digest (both locally and in ZooKeeper)
-    /// before DatabaseReplicatedDDLWorker::initializeReplication() has finished.
-    /// We should not update metadata until the database is initialized.
-    return ddl_worker_initialized && ddl_worker->isCurrentlyActive();
-}
-
-void DatabaseReplicated::detachTablePermanently(ContextPtr local_context, const String & table_name)
-{
-    auto txn = local_context->getZooKeeperMetadataTransaction();
-    assert(!ddl_worker->isCurrentlyActive() || txn);
-    if (txn && txn->isInitialQuery())
-    {
-        /// We have to remove metadata from zookeeper, because we do not distinguish permanently detached tables
-        /// from attached tables when recovering replica.
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
-        txn->addOp(zkutil::makeRemoveRequest(metadata_zk_path, -1));
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    new_digest -= getMetadataHash(table_name);
-    if (txn && !is_recovering)
-        txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-
-    DatabaseAtomic::detachTablePermanently(local_context, table_name);
-    tables_metadata_digest = new_digest;
-    assert(checkDigestValid(local_context));
-}
-
-void DatabaseReplicated::removeDetachedPermanentlyFlag(ContextPtr local_context, const String & table_name, const String & table_metadata_path, bool attach)
-{
-    auto txn = local_context->getZooKeeperMetadataTransaction();
-    assert(!ddl_worker->isCurrentlyActive() || txn);
-    if (txn && txn->isInitialQuery() && attach)
-    {
-        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
-        String statement = readMetadataFile(table_name);
-        txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement, zkutil::CreateMode::Persistent));
-    }
-
-    std::lock_guard lock{metadata_mutex};
-    UInt64 new_digest = tables_metadata_digest;
-    if (attach)
-    {
-        new_digest += getMetadataHash(table_name);
-        if (txn && !is_recovering)
-            txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
-    }
-
-    DatabaseAtomic::removeDetachedPermanentlyFlag(local_context, table_name, table_metadata_path, attach);
-    tables_metadata_digest = new_digest;
-    assert(checkDigestValid(local_context));
-}
-
-
-String DatabaseReplicated::readMetadataFile(const String & table_name) const
-{
-    String statement;
-    ReadBufferFromFile in(getObjectMetadataPath(table_name), METADATA_FILE_BUFFER_SIZE);
-    readStringUntilEOF(statement, in);
-    return statement;
-}
-
-
-std::vector<std::pair<ASTPtr, StoragePtr>>
-DatabaseReplicated::getTablesForBackup(const FilterByNameFunction & filter, const ContextPtr &) const
-{
-    /// Here we read metadata from ZooKeeper. We could do that by simple call of DatabaseAtomic::getTablesForBackup() however
-    /// reading from ZooKeeper is better because thus we won't be dependent on how fast the replication queue of this database is.
-    std::vector<std::pair<ASTPtr, StoragePtr>> res;
-    auto zookeeper = getContext()->getZooKeeper();
-    auto escaped_table_names = zookeeper->getChildren(zookeeper_path + "/metadata");
-    for (const auto & escaped_table_name : escaped_table_names)
-    {
-        String table_name = unescapeForFileName(escaped_table_name);
-        if (!filter(table_name))
-            continue;
-
-        String zk_metadata;
-        if (!zookeeper->tryGet(zookeeper_path + "/metadata/" + escaped_table_name, zk_metadata))
-            throw Exception(ErrorCodes::INCONSISTENT_METADATA_FOR_BACKUP, "Metadata for table {} was not found in ZooKeeper", table_name);
-
-        ParserCreateQuery parser;
-        auto create_table_query = parseQuery(parser, zk_metadata, 0, getContext()->getSettingsRef().max_parser_depth);
-
-        auto & create = create_table_query->as<ASTCreateQuery &>();
-        create.attach = false;
-        create.setTable(table_name);
-        create.setDatabase(getDatabaseName());
-
-        StoragePtr storage;
-        if (create.uuid != UUIDHelpers::Nil)
-        {
-            storage = DatabaseCatalog::instance().tryGetByUUID(create.uuid).second;
-            if (storage)
-                storage->adjustCreateQueryForBackup(create_table_query);
-        }
-
-        /// `storage` is allowed to be null here. In this case it means that this storage exists on other replicas
-        /// but it has not been created on this replica yet.
-
-        res.emplace_back(create_table_query, storage);
-    }
-
-    return res;
-}
-
-
-void DatabaseReplicated::createTableRestoredFromBackup(
-    const ASTPtr & create_table_query,
-    ContextMutablePtr local_context,
-    std::shared_ptr<IRestoreCoordination> restore_coordination,
-    UInt64 timeout_ms)
-{
-    /// Because of the replication multiple nodes can try to restore the same tables again and failed with "Table already exists"
-    /// because of some table could be restored already on other node and then replicated to this node.
-    /// To solve this problem we use the restore coordination: the first node calls
-    /// IRestoreCoordination::acquireCreatingTableInReplicatedDatabase() and then for other nodes this function returns false which means
-    /// this table is already being created by some other node.
-    String table_name = create_table_query->as<const ASTCreateQuery &>().getTable();
-    if (restore_coordination->acquireCreatingTableInReplicatedDatabase(getZooKeeperPath(), table_name))
-    {
-        DatabaseAtomic::createTableRestoredFromBackup(create_table_query, local_context, restore_coordination, timeout_ms);
-    }
-
-    /// Wait until the table is actually created no matter if it's created by the current or another node and replicated to the
-    /// current node afterwards. We have to wait because `RestorerFromBackup` is going to restore data of the table then.
-    /// TODO: The following code doesn't look very reliable, probably we need to rewrite it somehow.
-    auto timeout = std::chrono::milliseconds{timeout_ms};
-    auto start_time = std::chrono::steady_clock::now();
-    while (!isTableExist(table_name, local_context))
-    {
-        waitForReplicaToProcessAllEntries(50);
-
-        auto elapsed = std::chrono::steady_clock::now() - start_time;
-        if (elapsed > timeout)
-            throw Exception(ErrorCodes::CANNOT_RESTORE_TABLE,
-                            "Couldn't restore table {}.{} on other node or sync it (elapsed {})",
-                            backQuoteIfNeed(getDatabaseName()), backQuoteIfNeed(table_name), to_string(elapsed));
-    }
-}
-
-bool DatabaseReplicated::shouldReplicateQuery(const ContextPtr & query_context, const ASTPtr & query_ptr) const
-{
-    if (query_context->getClientInfo().is_replicated_database_internal)
-        return false;
-
-    /// we never replicate KeeperMap operations for some types of queries because it doesn't make sense
-    const auto is_keeper_map_table = [&](const ASTPtr & ast)
-    {
-        auto table_id = query_context->resolveStorageID(ast, Context::ResolveOrdinary);
-        StoragePtr table = DatabaseCatalog::instance().getTable(table_id, query_context);
-
-        return table->as<StorageKeeperMap>() != nullptr;
-    };
-
-    const auto is_replicated_table = [&](const ASTPtr & ast)
-    {
-        auto table_id = query_context->resolveStorageID(ast, Context::ResolveOrdinary);
-        StoragePtr table = DatabaseCatalog::instance().getTable(table_id, query_context);
-
-        return table->supportsReplication();
-    };
-
-    const auto has_many_shards = [&]()
-    {
-        /// If there is only 1 shard then there is no need to replicate some queries.
-        auto current_cluster = tryGetCluster();
-        return
-            !current_cluster || /// Couldn't get the cluster, so we don't know how many shards there are.
-            current_cluster->getShardsInfo().size() > 1;
-    };
-
-    /// Some ALTERs are not replicated on database level
-    if (const auto * alter = query_ptr->as<const ASTAlterQuery>())
-    {
-        if (alter->isAttachAlter() || alter->isFetchAlter() || alter->isDropPartitionAlter() || is_keeper_map_table(query_ptr) || alter->isFreezeAlter())
-            return false;
-
-        if (has_many_shards() || !is_replicated_table(query_ptr))
-            return true;
-
-        try
-        {
-            /// Metadata alter should go through database
-            for (const auto & child : alter->command_list->children)
-                if (AlterCommand::parse(child->as<ASTAlterCommand>()))
-                    return true;
-
-            /// It's ALTER PARTITION or mutation, doesn't involve database
-            return false;
-        }
-        catch (...)
-        {
-            tryLogCurrentException(log);
-        }
-
-        return true;
-    }
-
-    /// DROP DATABASE is not replicated
-    if (const auto * drop = query_ptr->as<const ASTDropQuery>())
-    {
-        if (drop->table.get())
-            return drop->kind != ASTDropQuery::Truncate || !is_keeper_map_table(query_ptr);
-
-        return false;
-    }
-
-    if (query_ptr->as<const ASTDeleteQuery>() != nullptr)
-    {
-        if (is_keeper_map_table(query_ptr))
-            return false;
-
-        return has_many_shards() || !is_replicated_table(query_ptr);
-    }
-
-    return true;
-}
-
-}