ClickHouse/src/Planner/PlannerJoinTree.cpp

#include <Planner/PlannerJoinTree.h>

#include <Common/scope_guard_safe.h>

#include <Columns/ColumnAggregateFunction.h>

#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeAggregateFunction.h>
#include <DataTypes/DataTypeLowCardinality.h>

#include <Functions/FunctionFactory.h>

#include <AggregateFunctions/AggregateFunctionCount.h>

#include <Access/Common/AccessFlags.h>
#include <Access/ContextAccess.h>

#include <Storages/IStorage.h>
#include <Storages/MergeTree/MergeTreeData.h>
#include <Storages/StorageDictionary.h>
#include <Storages/StorageDistributed.h>

#include <Analyzer/ConstantNode.h>
#include <Analyzer/ColumnNode.h>
#include <Analyzer/FunctionNode.h>
#include <Analyzer/TableNode.h>
#include <Analyzer/TableFunctionNode.h>
#include <Analyzer/QueryNode.h>
#include <Analyzer/UnionNode.h>
#include <Analyzer/JoinNode.h>
#include <Analyzer/ArrayJoinNode.h>
#include <Analyzer/Utils.h>
#include <Analyzer/AggregationUtils.h>
#include <Analyzer/Passes/QueryAnalysisPass.h>
#include <Analyzer/QueryTreeBuilder.h>

#include <Parsers/ExpressionListParsers.h>
#include <Parsers/parseQuery.h>

#include <Processors/Sources/NullSource.h>
#include <Processors/QueryPlan/SortingStep.h>
#include <Processors/QueryPlan/CreateSetAndFilterOnTheFlyStep.h>
#include <Processors/QueryPlan/ReadFromPreparedSource.h>
#include <Processors/QueryPlan/ExpressionStep.h>
#include <Processors/QueryPlan/FilterStep.h>
#include <Processors/QueryPlan/JoinStep.h>
#include <Processors/QueryPlan/ArrayJoinStep.h>
#include <Processors/Sources/SourceFromSingleChunk.h>

#include <Storages/StorageDummy.h>

#include <Interpreters/ArrayJoinAction.h>
#include <Interpreters/Context.h>
#include <Interpreters/HashJoin.h>
#include <Interpreters/IJoin.h>
#include <Interpreters/TableJoin.h>
#include <Interpreters/getCustomKeyFilterForParallelReplicas.h>

#include <Planner/CollectColumnIdentifiers.h>
#include <Planner/Planner.h>
#include <Planner/PlannerJoins.h>
#include <Planner/PlannerActionsVisitor.h>
#include <Planner/Utils.h>
#include <Planner/CollectSets.h>
#include <Planner/CollectTableExpressionData.h>

namespace DB
{

namespace ErrorCodes
{
    extern const int INVALID_JOIN_ON_EXPRESSION;
    extern const int LOGICAL_ERROR;
    extern const int NOT_IMPLEMENTED;
    extern const int SYNTAX_ERROR;
    extern const int ACCESS_DENIED;
    extern const int PARAMETER_OUT_OF_BOUND;
    extern const int TOO_MANY_COLUMNS;
    extern const int UNSUPPORTED_METHOD;
    extern const int BAD_ARGUMENTS;
}

namespace
{

/// Check if current user has privileges to SELECT columns from table
void checkAccessRights(const TableNode & table_node, const Names & column_names, const ContextPtr & query_context)
{
    /// StorageDummy is created on preliminary stage, ignore access check for it.
    if (typeid_cast<const StorageDummy *>(table_node.getStorage().get()))
        return;

    const auto & storage_id = table_node.getStorageID();
    const auto & storage_snapshot = table_node.getStorageSnapshot();

    if (column_names.empty())
    {
        /** For a trivial queries like "SELECT count() FROM table", "SELECT 1 FROM table" access is granted if at least
          * one table column is accessible.
          */
        auto access = query_context->getAccess();

        for (const auto & column : storage_snapshot->metadata->getColumns())
        {
            if (access->isGranted(AccessType::SELECT, storage_id.database_name, storage_id.table_name, column.name))
                return;
        }

        throw Exception(ErrorCodes::ACCESS_DENIED,
            "{}: Not enough privileges. To execute this query, it's necessary to have the grant SELECT for at least one column on {}",
            query_context->getUserName(),
            storage_id.getFullTableName());
    }

    // In case of cross-replication we don't know what database is used for the table.
    // `storage_id.hasDatabase()` can return false only on the initiator node.
    // Each shard will use the default database (in the case of cross-replication shards may have different defaults).
    if (storage_id.hasDatabase())
        query_context->checkAccess(AccessType::SELECT, storage_id, column_names);
}

bool shouldIgnoreQuotaAndLimits(const TableNode & table_node)
{
    const auto & storage_id = table_node.getStorageID();
    if (!storage_id.hasDatabase())
        return false;
    if (storage_id.database_name == DatabaseCatalog::SYSTEM_DATABASE)
    {
        static const boost::container::flat_set<std::string_view> tables_ignoring_quota{"quotas", "quota_limits", "quota_usage", "quotas_usage", "one"};
        if (tables_ignoring_quota.contains(storage_id.table_name))
            return true;
    }
    return false;
}

NameAndTypePair chooseSmallestColumnToReadFromStorage(const StoragePtr & storage, const StorageSnapshotPtr & storage_snapshot)
{
    /** We need to read at least one column to find the number of rows.
      * We will find a column with minimum <compressed_size, type_size, uncompressed_size>.
      * Because it is the column that is cheapest to read.
      */
    class ColumnWithSize
    {
    public:
        ColumnWithSize(NameAndTypePair column_, ColumnSize column_size_)
            : column(std::move(column_))
            , compressed_size(column_size_.data_compressed)
            , uncompressed_size(column_size_.data_uncompressed)
            , type_size(column.type->haveMaximumSizeOfValue() ? column.type->getMaximumSizeOfValueInMemory() : 100)
        {
        }

        bool operator<(const ColumnWithSize & rhs) const
        {
            return std::tie(compressed_size, type_size, uncompressed_size)
                < std::tie(rhs.compressed_size, rhs.type_size, rhs.uncompressed_size);
        }

        NameAndTypePair column;
        size_t compressed_size = 0;
        size_t uncompressed_size = 0;
        size_t type_size = 0;
    };

    std::vector<ColumnWithSize> columns_with_sizes;

    auto column_sizes = storage->getColumnSizes();
    auto column_names_and_types = storage_snapshot->getColumns(GetColumnsOptions(GetColumnsOptions::AllPhysical).withSubcolumns());

    if (!column_sizes.empty())
    {
        for (auto & column_name_and_type : column_names_and_types)
        {
            auto it = column_sizes.find(column_name_and_type.name);
            if (it == column_sizes.end())
                continue;

            columns_with_sizes.emplace_back(column_name_and_type, it->second);
        }
    }

    NameAndTypePair result;

    if (!columns_with_sizes.empty())
        result = std::min_element(columns_with_sizes.begin(), columns_with_sizes.end())->column;
    else
        /// If we have no information about columns sizes, choose a column of minimum size of its data type
        result = ExpressionActions::getSmallestColumn(column_names_and_types);

    return result;
}

bool applyTrivialCountIfPossible(
    QueryPlan & query_plan,
    SelectQueryInfo & select_query_info,
    const TableNode * table_node,
    const TableFunctionNode * table_function_node,
    const QueryTreeNodePtr & query_tree,
    ContextMutablePtr & query_context,
    const Names & columns_names)
{
    const auto & settings = query_context->getSettingsRef();
    if (!settings.optimize_trivial_count_query)
        return false;

    const auto & storage = table_node ? table_node->getStorage() : table_function_node->getStorage();
    if (!storage->supportsTrivialCountOptimization())
        return false;

    auto storage_id = storage->getStorageID();
    auto row_policy_filter = query_context->getRowPolicyFilter(storage_id.getDatabaseName(),
        storage_id.getTableName(),
        RowPolicyFilterType::SELECT_FILTER);
    if (row_policy_filter)
        return {};

    if (select_query_info.additional_filter_ast)
        return false;

    /** Transaction check here is necessary because
      * MergeTree maintains total count for all parts in Active state and it simply returns that number for trivial select count() from table query.
      * But if we have current transaction, then we should return number of rows in current snapshot (that may include parts in Outdated state),
      * so we have to use totalRowsByPartitionPredicate() instead of totalRows even for trivial query
      * See https://github.com/ClickHouse/ClickHouse/pull/24258/files#r828182031
      */
    if (query_context->getCurrentTransaction())
        return false;

    /// can't apply if FINAL
    if (table_node && table_node->getTableExpressionModifiers().has_value() &&
        (table_node->getTableExpressionModifiers()->hasFinal() || table_node->getTableExpressionModifiers()->hasSampleSizeRatio() ||
         table_node->getTableExpressionModifiers()->hasSampleOffsetRatio()))
        return false;
    else if (table_function_node && table_function_node->getTableExpressionModifiers().has_value() &&
        (table_function_node->getTableExpressionModifiers()->hasFinal() || table_function_node->getTableExpressionModifiers()->hasSampleSizeRatio() ||
         table_function_node->getTableExpressionModifiers()->hasSampleOffsetRatio()))
        return false;

    // TODO: It's possible to optimize count() given only partition predicates
    auto & main_query_node = query_tree->as<QueryNode &>();
    if (main_query_node.hasGroupBy() || main_query_node.hasPrewhere() || main_query_node.hasWhere())
        return false;

    if (storage->hasLightweightDeletedMask())
        return false;

    if (settings.allow_experimental_query_deduplication
        || settings.empty_result_for_aggregation_by_empty_set)
        return false;

    QueryTreeNodes aggregates = collectAggregateFunctionNodes(query_tree);
    if (aggregates.size() != 1)
        return false;

    const auto & function_node = aggregates.front().get()->as<const FunctionNode &>();
    chassert(function_node.getAggregateFunction() != nullptr);
    const auto * count_func = typeid_cast<const AggregateFunctionCount *>(function_node.getAggregateFunction().get());
    if (!count_func)
        return false;

    /// Some storages can optimize trivial count in read() method instead of totalRows() because it still can
    /// require reading some data (but much faster than reading columns).
    /// Set a special flag in query info so the storage will see it and optimize count in read() method.
    select_query_info.optimize_trivial_count = true;

    /// Get number of rows
    std::optional<UInt64> num_rows = storage->totalRows(settings);
    if (!num_rows)
        return false;

    if (settings.max_parallel_replicas > 1)
    {
        if (!settings.parallel_replicas_custom_key.value.empty() || settings.allow_experimental_parallel_reading_from_replicas == 0)
            return false;

        /// The query could use trivial count if it didn't use parallel replicas, so let's disable it
        query_context->setSetting("allow_experimental_parallel_reading_from_replicas", Field(0));
        query_context->setSetting("max_parallel_replicas", UInt64{0});
        LOG_TRACE(&Poco::Logger::get("Planner"), "Disabling parallel replicas to be able to use a trivial count optimization");

    }

    /// Set aggregation state
    const AggregateFunctionCount & agg_count = *count_func;
    std::vector<char> state(agg_count.sizeOfData());
    AggregateDataPtr place = state.data();
    agg_count.create(place);
    SCOPE_EXIT_MEMORY_SAFE(agg_count.destroy(place));
    agg_count.set(place, num_rows.value());

    auto column = ColumnAggregateFunction::create(function_node.getAggregateFunction());
    column->insertFrom(place);

    /// get count() argument type
    DataTypes argument_types;
    argument_types.reserve(columns_names.size());
    {
        const Block source_header = table_node ? table_node->getStorageSnapshot()->getSampleBlockForColumns(columns_names)
                                               : table_function_node->getStorageSnapshot()->getSampleBlockForColumns(columns_names);
        for (const auto & column_name : columns_names)
            argument_types.push_back(source_header.getByName(column_name).type);
    }

    Block block_with_count{
        {std::move(column),
         std::make_shared<DataTypeAggregateFunction>(function_node.getAggregateFunction(), argument_types, Array{}),
         columns_names.front()}};

    auto source = std::make_shared<SourceFromSingleChunk>(block_with_count);
    auto prepared_count = std::make_unique<ReadFromPreparedSource>(Pipe(std::move(source)));
    prepared_count->setStepDescription("Optimized trivial count");
    query_plan.addStep(std::move(prepared_count));

    return true;
}

void prepareBuildQueryPlanForTableExpression(const QueryTreeNodePtr & table_expression, PlannerContextPtr & planner_context)
{
    const auto & query_context = planner_context->getQueryContext();
    const auto & settings = query_context->getSettingsRef();

    auto & table_expression_data = planner_context->getTableExpressionDataOrThrow(table_expression);
    auto columns_names = table_expression_data.getColumnNames();

    auto * table_node = table_expression->as<TableNode>();
    auto * table_function_node = table_expression->as<TableFunctionNode>();
    auto * query_node = table_expression->as<QueryNode>();
    auto * union_node = table_expression->as<UnionNode>();

    /** The current user must have the SELECT privilege.
      * We do not check access rights for table functions because they have been already checked in ITableFunction::execute().
      */
    if (table_node)
    {
        auto column_names_with_aliases = columns_names;
        const auto & alias_columns_names = table_expression_data.getAliasColumnsNames();
        column_names_with_aliases.insert(column_names_with_aliases.end(), alias_columns_names.begin(), alias_columns_names.end());
        checkAccessRights(*table_node, column_names_with_aliases, query_context);
    }

    if (columns_names.empty())
    {
        NameAndTypePair additional_column_to_read;

        if (table_node || table_function_node)
        {
            const auto & storage = table_node ? table_node->getStorage() : table_function_node->getStorage();
            const auto & storage_snapshot = table_node ? table_node->getStorageSnapshot() : table_function_node->getStorageSnapshot();
            additional_column_to_read = chooseSmallestColumnToReadFromStorage(storage, storage_snapshot);

        }
        else if (query_node || union_node)
        {
            const auto & projection_columns = query_node ? query_node->getProjectionColumns() : union_node->computeProjectionColumns();
            NamesAndTypesList projection_columns_list(projection_columns.begin(), projection_columns.end());
            additional_column_to_read = ExpressionActions::getSmallestColumn(projection_columns_list);
        }
        else
        {
            throw Exception(ErrorCodes::LOGICAL_ERROR, "Expected table, table function, query or union. Actual {}",
                            table_expression->formatASTForErrorMessage());
        }

        auto & global_planner_context = planner_context->getGlobalPlannerContext();
        const auto & column_identifier = global_planner_context->createColumnIdentifier(additional_column_to_read, table_expression);
        columns_names.push_back(additional_column_to_read.name);
        table_expression_data.addColumn(additional_column_to_read, column_identifier);
    }

    /// Limitation on the number of columns to read
    if (settings.max_columns_to_read && columns_names.size() > settings.max_columns_to_read)
        throw Exception(ErrorCodes::TOO_MANY_COLUMNS,
            "Limit for number of columns to read exceeded. Requested: {}, maximum: {}",
            columns_names.size(),
            settings.max_columns_to_read);
}

void updatePrewhereOutputsIfNeeded(SelectQueryInfo & table_expression_query_info,
    const Names & column_names,
    const StorageSnapshotPtr & storage_snapshot)
{
    if (!table_expression_query_info.prewhere_info)
        return;

    auto & prewhere_actions = table_expression_query_info.prewhere_info->prewhere_actions;

    NameSet required_columns;
    if (column_names.size() == 1)
        required_columns.insert(column_names[0]);

    auto & table_expression_modifiers = table_expression_query_info.table_expression_modifiers;
    if (table_expression_modifiers)
    {
        if (table_expression_modifiers->hasSampleSizeRatio() ||
            table_expression_query_info.planner_context->getQueryContext()->getSettingsRef().parallel_replicas_count > 1)
        {
            /// We evaluate sampling for Merge lazily so we need to get all the columns
            if (storage_snapshot->storage.getName() == "Merge")
            {
                const auto columns = storage_snapshot->getMetadataForQuery()->getColumns().getAll();
                for (const auto & column : columns)
                    required_columns.insert(column.name);
            }
            else
            {
                auto columns_required_for_sampling = storage_snapshot->getMetadataForQuery()->getColumnsRequiredForSampling();
                required_columns.insert(columns_required_for_sampling.begin(), columns_required_for_sampling.end());
            }
        }

        if (table_expression_modifiers->hasFinal())
        {
            auto columns_required_for_final = storage_snapshot->getMetadataForQuery()->getColumnsRequiredForFinal();
            required_columns.insert(columns_required_for_final.begin(), columns_required_for_final.end());
        }
    }

    std::unordered_set<const ActionsDAG::Node *> required_output_nodes;

    for (const auto * input : prewhere_actions->getInputs())
    {
        if (required_columns.contains(input->result_name))
            required_output_nodes.insert(input);
    }

    if (required_output_nodes.empty())
        return;

    auto & prewhere_outputs = prewhere_actions->getOutputs();
    for (const auto & output : prewhere_outputs)
    {
        auto required_output_node_it = required_output_nodes.find(output);
        if (required_output_node_it == required_output_nodes.end())
            continue;

        required_output_nodes.erase(required_output_node_it);
    }

    prewhere_outputs.insert(prewhere_outputs.end(), required_output_nodes.begin(), required_output_nodes.end());
}

FilterDAGInfo buildRowPolicyFilterIfNeeded(const StoragePtr & storage,
    SelectQueryInfo & table_expression_query_info,
    PlannerContextPtr & planner_context,
    std::set<std::string> & used_row_policies)
{
    auto storage_id = storage->getStorageID();
    const auto & query_context = planner_context->getQueryContext();

    auto row_policy_filter = query_context->getRowPolicyFilter(storage_id.getDatabaseName(), storage_id.getTableName(), RowPolicyFilterType::SELECT_FILTER);
    if (!row_policy_filter || row_policy_filter->empty())
        return {};

    for (const auto & row_policy : row_policy_filter->policies)
    {
        auto name = row_policy->getFullName().toString();
        used_row_policies.emplace(std::move(name));
    }

    return buildFilterInfo(row_policy_filter->expression, table_expression_query_info.table_expression, planner_context);
}

FilterDAGInfo buildCustomKeyFilterIfNeeded(const StoragePtr & storage,
    SelectQueryInfo & table_expression_query_info,
    PlannerContextPtr & planner_context)
{
    const auto & query_context = planner_context->getQueryContext();
    const auto & settings = query_context->getSettingsRef();

    if (settings.parallel_replicas_count <= 1 || settings.parallel_replicas_custom_key.value.empty())
        return {};

    auto custom_key_ast = parseCustomKeyForTable(settings.parallel_replicas_custom_key, *query_context);
    if (!custom_key_ast)
        throw DB::Exception(
                ErrorCodes::BAD_ARGUMENTS,
                "Parallel replicas processing with custom_key has been requested "
                "(setting 'max_parallel_replcias'), but the table does not have custom_key defined for it "
                " or it's invalid (setting 'parallel_replicas_custom_key')");

    LOG_TRACE(&Poco::Logger::get("Planner"), "Processing query on a replica using custom_key '{}'", settings.parallel_replicas_custom_key.value);

    auto parallel_replicas_custom_filter_ast = getCustomKeyFilterForParallelReplica(
            settings.parallel_replicas_count,
            settings.parallel_replica_offset,
            std::move(custom_key_ast),
            settings.parallel_replicas_custom_key_filter_type,
            storage->getInMemoryMetadataPtr()->columns,
            query_context);

    return buildFilterInfo(parallel_replicas_custom_filter_ast, table_expression_query_info.table_expression, planner_context);
}

/// Apply filters from additional_table_filters setting
FilterDAGInfo buildAdditionalFiltersIfNeeded(const StoragePtr & storage,
    const String & table_expression_alias,
    SelectQueryInfo & table_expression_query_info,
    PlannerContextPtr & planner_context)
{
    const auto & query_context = planner_context->getQueryContext();
    const auto & settings = query_context->getSettingsRef();

    auto const & additional_filters = settings.additional_table_filters.value;
    if (additional_filters.empty())
        return {};

    auto const & storage_id = storage->getStorageID();

    ASTPtr additional_filter_ast;
    for (const auto & additional_filter : additional_filters)
    {
        const auto & tuple = additional_filter.safeGet<const Tuple &>();
        auto const & table = tuple.at(0).safeGet<String>();
        auto const & filter = tuple.at(1).safeGet<String>();

        if (table == table_expression_alias ||
            (table == storage_id.getTableName() && query_context->getCurrentDatabase() == storage_id.getDatabaseName()) ||
            (table == storage_id.getFullNameNotQuoted()))
        {
            ParserExpression parser;
            additional_filter_ast = parseQuery(
                parser, filter.data(), filter.data() + filter.size(),
                "additional filter", settings.max_query_size, settings.max_parser_depth);
            break;
        }
    }

    if (!additional_filter_ast)
        return {};

    table_expression_query_info.additional_filter_ast = additional_filter_ast;
    return buildFilterInfo(additional_filter_ast, table_expression_query_info.table_expression, planner_context);
}

UInt64 mainQueryNodeBlockSizeByLimit(const SelectQueryInfo & select_query_info)
{
    auto const & main_query_node = select_query_info.query_tree->as<QueryNode const &>();

    /// Constness of limit and offset is validated during query analysis stage
    size_t limit_length = 0;
    if (main_query_node.hasLimit())
        limit_length = main_query_node.getLimit()->as<ConstantNode &>().getValue().safeGet<UInt64>();

    size_t limit_offset = 0;
    if (main_query_node.hasOffset())
        limit_offset = main_query_node.getOffset()->as<ConstantNode &>().getValue().safeGet<UInt64>();

    /** If not specified DISTINCT, WHERE, GROUP BY, HAVING, ORDER BY, JOIN, LIMIT BY, LIMIT WITH TIES
      * but LIMIT is specified, and limit + offset < max_block_size,
      * then as the block size we will use limit + offset (not to read more from the table than requested),
      * and also set the number of threads to 1.
      */
    if (main_query_node.hasLimit()
        && !main_query_node.isDistinct()
        && !main_query_node.isLimitWithTies()
        && !main_query_node.hasPrewhere()
        && !main_query_node.hasWhere()
        && select_query_info.filter_asts.empty()
        && !main_query_node.hasGroupBy()
        && !main_query_node.hasHaving()
        && !main_query_node.hasOrderBy()
        && !main_query_node.hasLimitBy()
        && !select_query_info.need_aggregate
        && !select_query_info.has_window
        && limit_length <= std::numeric_limits<UInt64>::max() - limit_offset)
        return limit_length + limit_offset;
    return 0;
}

JoinTreeQueryPlan buildQueryPlanForTableExpression(QueryTreeNodePtr table_expression,
    const SelectQueryInfo & select_query_info,
    const SelectQueryOptions & select_query_options,
    PlannerContextPtr & planner_context,
    bool is_single_table_expression,
    bool wrap_read_columns_in_subquery)
{
    const auto & query_context = planner_context->getQueryContext();
    const auto & settings = query_context->getSettingsRef();

    auto & table_expression_data = planner_context->getTableExpressionDataOrThrow(table_expression);

    QueryProcessingStage::Enum from_stage = QueryProcessingStage::Enum::FetchColumns;

    if (wrap_read_columns_in_subquery)
    {
        auto columns = table_expression_data.getColumns();
        table_expression = buildSubqueryToReadColumnsFromTableExpression(columns, table_expression, query_context);
    }

    auto * table_node = table_expression->as<TableNode>();
    auto * table_function_node = table_expression->as<TableFunctionNode>();
    auto * query_node = table_expression->as<QueryNode>();
    auto * union_node = table_expression->as<UnionNode>();

    QueryPlan query_plan;
    std::set<std::string> used_row_policies;

    if (table_node || table_function_node)
    {
        const auto & storage = table_node ? table_node->getStorage() : table_function_node->getStorage();
        const auto & storage_snapshot = table_node ? table_node->getStorageSnapshot() : table_function_node->getStorageSnapshot();

        auto table_expression_query_info = select_query_info;
        table_expression_query_info.table_expression = table_expression;
        table_expression_query_info.filter_actions_dag = table_expression_data.getFilterActions();

        size_t max_streams = settings.max_threads;
        size_t max_threads_execute_query = settings.max_threads;

        /**
         * To simultaneously query more remote servers when async_socket_for_remote is off
         * instead of max_threads, max_distributed_connections is used:
         * since threads there mostly spend time waiting for data from remote servers,
         * we can increase the degree of parallelism to avoid sequential querying of remote servers.
         *
         * DANGER: that can lead to insane number of threads working if there are a lot of stream and prefer_localhost_replica is used.
         *
         * That is not needed when async_socket_for_remote is on, because in that case
         * threads are not blocked waiting for data from remote servers.
         *
         */
        bool is_sync_remote = table_expression_data.isRemote() && !settings.async_socket_for_remote;
        if (is_sync_remote)
        {
            max_streams = settings.max_distributed_connections;
            max_threads_execute_query = settings.max_distributed_connections;
        }

        UInt64 max_block_size = settings.max_block_size;
        UInt64 max_block_size_limited = 0;
        if (is_single_table_expression)
        {
            /** If not specified DISTINCT, WHERE, GROUP BY, HAVING, ORDER BY, JOIN, LIMIT BY, LIMIT WITH TIES
              * but LIMIT is specified, and limit + offset < max_block_size,
              * then as the block size we will use limit + offset (not to read more from the table than requested),
              * and also set the number of threads to 1.
              */
            max_block_size_limited = mainQueryNodeBlockSizeByLimit(select_query_info);
            if (max_block_size_limited)
            {
                if (max_block_size_limited < max_block_size)
                {
                    max_block_size = std::max<UInt64>(1, max_block_size_limited);
                    max_streams = 1;
                    max_threads_execute_query = 1;
                }

                if (max_block_size_limited < select_query_info.local_storage_limits.local_limits.size_limits.max_rows)
                {
                    table_expression_query_info.limit = max_block_size_limited;
                }
            }

            if (!max_block_size)
                throw Exception(ErrorCodes::PARAMETER_OUT_OF_BOUND,
                    "Setting 'max_block_size' cannot be zero");
        }

        if (max_streams == 0)
            max_streams = 1;

        /// If necessary, we request more sources than the number of threads - to distribute the work evenly over the threads
        if (max_streams > 1 && !is_sync_remote)
            max_streams = static_cast<size_t>(max_streams * settings.max_streams_to_max_threads_ratio);

        if (table_node)
            table_expression_query_info.table_expression_modifiers = table_node->getTableExpressionModifiers();
        else
            table_expression_query_info.table_expression_modifiers = table_function_node->getTableExpressionModifiers();

        bool need_rewrite_query_with_final = storage->needRewriteQueryWithFinal(table_expression_data.getColumnNames());
        if (need_rewrite_query_with_final)
        {
            if (table_expression_query_info.table_expression_modifiers)
            {
                const auto & table_expression_modifiers = table_expression_query_info.table_expression_modifiers;
                auto sample_size_ratio = table_expression_modifiers->getSampleSizeRatio();
                auto sample_offset_ratio = table_expression_modifiers->getSampleOffsetRatio();

                table_expression_query_info.table_expression_modifiers = TableExpressionModifiers(true /*has_final*/,
                    sample_size_ratio,
                    sample_offset_ratio);
            }
            else
            {
                table_expression_query_info.table_expression_modifiers = TableExpressionModifiers(true /*has_final*/,
                    {} /*sample_size_ratio*/,
                    {} /*sample_offset_ratio*/);
            }
        }

        /// Apply trivial_count optimization if possible
        bool is_trivial_count_applied = !select_query_options.only_analyze &&
            is_single_table_expression &&
            (table_node || table_function_node) &&
            select_query_info.has_aggregates &&
            settings.additional_table_filters.value.empty() &&
            applyTrivialCountIfPossible(query_plan, table_expression_query_info, table_node, table_function_node, select_query_info.query_tree, planner_context->getMutableQueryContext(), table_expression_data.getColumnNames());

        if (is_trivial_count_applied)
        {
            from_stage = QueryProcessingStage::WithMergeableState;
        }
        else
        {
            if (!select_query_options.only_analyze)
            {
                auto storage_merge_tree = std::dynamic_pointer_cast<MergeTreeData>(storage);
                if (storage_merge_tree && query_context->canUseParallelReplicasOnInitiator()
                    && settings.parallel_replicas_min_number_of_rows_per_replica > 0)
                {
                    ActionDAGNodes filter_nodes;
                    if (table_expression_query_info.filter_actions_dag)
                        filter_nodes.nodes = table_expression_query_info.filter_actions_dag->getOutputs();
                    UInt64 rows_to_read = storage_merge_tree->estimateNumberOfRowsToRead(
                        query_context, storage_snapshot, table_expression_query_info, filter_nodes);

                    if (max_block_size_limited && (max_block_size_limited < rows_to_read))
                        rows_to_read = max_block_size_limited;

                    size_t number_of_replicas_to_use = rows_to_read / settings.parallel_replicas_min_number_of_rows_per_replica;
                    LOG_TRACE(
                        &Poco::Logger::get("Planner"),
                        "Estimated {} rows to read. It is enough work for {} parallel replicas",
                        rows_to_read,
                        number_of_replicas_to_use);

                    if (number_of_replicas_to_use <= 1)
                    {
                        planner_context->getMutableQueryContext()->setSetting(
                            "allow_experimental_parallel_reading_from_replicas", Field(0));
                        planner_context->getMutableQueryContext()->setSetting("max_parallel_replicas", UInt64{0});
                        LOG_DEBUG(&Poco::Logger::get("Planner"), "Disabling parallel replicas because there aren't enough rows to read");
                    }
                    else if (number_of_replicas_to_use < settings.max_parallel_replicas)
                    {
                        planner_context->getMutableQueryContext()->setSetting("max_parallel_replicas", number_of_replicas_to_use);
                        LOG_DEBUG(&Poco::Logger::get("Planner"), "Reducing the number of replicas to use to {}", number_of_replicas_to_use);
                    }
                }

                const auto & prewhere_actions = table_expression_data.getPrewhereFilterActions();

                if (prewhere_actions)
                {
                    table_expression_query_info.prewhere_info = std::make_shared<PrewhereInfo>();
                    table_expression_query_info.prewhere_info->prewhere_actions = prewhere_actions;
                    table_expression_query_info.prewhere_info->prewhere_column_name = prewhere_actions->getOutputs().at(0)->result_name;
                    table_expression_query_info.prewhere_info->remove_prewhere_column = true;
                    table_expression_query_info.prewhere_info->need_filter = true;
                }

                updatePrewhereOutputsIfNeeded(table_expression_query_info, table_expression_data.getColumnNames(), storage_snapshot);

                const auto & columns_names = table_expression_data.getColumnNames();

                std::vector<std::pair<FilterDAGInfo, std::string>> where_filters;
                const auto add_filter = [&](const FilterDAGInfo & filter_info, std::string description)
                {
                    if (!filter_info.actions)
                        return;

                    bool is_final = table_expression_query_info.table_expression_modifiers &&
                        table_expression_query_info.table_expression_modifiers->hasFinal();
                    bool optimize_move_to_prewhere = settings.optimize_move_to_prewhere && (!is_final || settings.optimize_move_to_prewhere_if_final);

                    if (storage->supportsPrewhere() && optimize_move_to_prewhere)
                    {
                        if (!table_expression_query_info.prewhere_info)
                            table_expression_query_info.prewhere_info = std::make_shared<PrewhereInfo>();

                        if (!table_expression_query_info.prewhere_info->prewhere_actions)
                        {
                            table_expression_query_info.prewhere_info->prewhere_actions = filter_info.actions;
                            table_expression_query_info.prewhere_info->prewhere_column_name = filter_info.column_name;
                            table_expression_query_info.prewhere_info->remove_prewhere_column = filter_info.do_remove_column;
                        }
                        else
                        {
                            table_expression_query_info.prewhere_info->row_level_filter = filter_info.actions;
                            table_expression_query_info.prewhere_info->row_level_column_name = filter_info.column_name;
                        }

                        table_expression_query_info.prewhere_info->need_filter = true;
                    }
                    else
                    {
                        where_filters.emplace_back(filter_info, std::move(description));
                    }
                };

                auto row_policy_filter_info = buildRowPolicyFilterIfNeeded(storage, table_expression_query_info, planner_context, used_row_policies);
                add_filter(row_policy_filter_info, "Row-level security filter");
                if (row_policy_filter_info.actions)
                    table_expression_data.setRowLevelFilterActions(row_policy_filter_info.actions);

                if (query_context->getParallelReplicasMode() == Context::ParallelReplicasMode::CUSTOM_KEY)
                {
                    if (settings.parallel_replicas_count > 1)
                    {
                        auto parallel_replicas_custom_key_filter_info = buildCustomKeyFilterIfNeeded(storage, table_expression_query_info, planner_context);
                        add_filter(parallel_replicas_custom_key_filter_info, "Parallel replicas custom key filter");
                    }
                    else
                    {
                        if (auto * distributed = typeid_cast<StorageDistributed *>(storage.get());
                            distributed && canUseCustomKey(settings, *distributed->getCluster(), *query_context))
                        {
                            table_expression_query_info.use_custom_key = true;
                            planner_context->getMutableQueryContext()->setSetting("distributed_group_by_no_merge", 2);
                        }
                    }
                }

                const auto & table_expression_alias = table_expression->getAlias();
                auto additional_filters_info = buildAdditionalFiltersIfNeeded(storage, table_expression_alias, table_expression_query_info, planner_context);
                add_filter(additional_filters_info, "additional filter");

                from_stage = storage->getQueryProcessingStage(query_context, select_query_options.to_stage, storage_snapshot, table_expression_query_info);
                storage->read(query_plan, columns_names, storage_snapshot, table_expression_query_info, query_context, from_stage, max_block_size, max_streams);

                for (const auto & filter_info_and_description : where_filters)
                {
                    const auto & [filter_info, description] = filter_info_and_description;
                    if (query_plan.isInitialized() &&
                        from_stage == QueryProcessingStage::FetchColumns &&
                        filter_info.actions)
                    {
                        auto filter_step = std::make_unique<FilterStep>(query_plan.getCurrentDataStream(),
                            filter_info.actions,
                            filter_info.column_name,
                            filter_info.do_remove_column);
                        filter_step->setStepDescription(description);
                        query_plan.addStep(std::move(filter_step));
                    }
                }

                if (query_context->hasQueryContext() && !select_query_options.is_internal)
                {
                    auto local_storage_id = storage->getStorageID();
                    query_context->getQueryContext()->addQueryAccessInfo(
                        backQuoteIfNeed(local_storage_id.getDatabaseName()),
                        local_storage_id.getFullTableName(),
                        columns_names,
                        {},
                        {});
                }
            }

            if (query_plan.isInitialized())
            {
                /** Specify the number of threads only if it wasn't specified in storage.
                  *
                  * But in case of remote query and prefer_localhost_replica=1 (default)
                  * The inner local query (that is done in the same process, without
                  * network interaction), it will setMaxThreads earlier and distributed
                  * query will not update it.
                  */
                if (!query_plan.getMaxThreads() || is_sync_remote)
                    query_plan.setMaxThreads(max_threads_execute_query);

                query_plan.setConcurrencyControl(settings.use_concurrency_control);
            }
            else
            {
                /// Create step which reads from empty source if storage has no data.
                auto source_header = storage_snapshot->getSampleBlockForColumns(table_expression_data.getColumnNames());
                Pipe pipe(std::make_shared<NullSource>(source_header));
                auto read_from_pipe = std::make_unique<ReadFromPreparedSource>(std::move(pipe));
                read_from_pipe->setStepDescription("Read from NullSource");
                query_plan.addStep(std::move(read_from_pipe));
            }
        }
    }
    else if (query_node || union_node)
    {
        if (select_query_options.only_analyze)
        {
            auto projection_columns = query_node ? query_node->getProjectionColumns() : union_node->computeProjectionColumns();
            Block source_header;
            for (auto & projection_column : projection_columns)
                source_header.insert(ColumnWithTypeAndName(projection_column.type, projection_column.name));

            Pipe pipe(std::make_shared<NullSource>(source_header));
            auto read_from_pipe = std::make_unique<ReadFromPreparedSource>(std::move(pipe));
            read_from_pipe->setStepDescription("Read from NullSource");
            query_plan.addStep(std::move(read_from_pipe));
        }
        else
        {
            auto subquery_options = select_query_options.subquery();
            Planner subquery_planner(table_expression, subquery_options, planner_context->getGlobalPlannerContext());
            /// Propagate storage limits to subquery
            subquery_planner.addStorageLimits(*select_query_info.storage_limits);
            subquery_planner.buildQueryPlanIfNeeded();
            query_plan = std::move(subquery_planner).extractQueryPlan();
        }
    }
    else
    {
        throw Exception(ErrorCodes::LOGICAL_ERROR, "Expected table, table function, query or union. Actual {}",
                        table_expression->formatASTForErrorMessage());
    }

    if (from_stage == QueryProcessingStage::FetchColumns)
    {
        auto rename_actions_dag = std::make_shared<ActionsDAG>(query_plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
        ActionsDAG::NodeRawConstPtrs updated_actions_dag_outputs;

        for (auto & output_node : rename_actions_dag->getOutputs())
        {
            const auto * column_identifier = table_expression_data.getColumnIdentifierOrNull(output_node->result_name);
            if (!column_identifier)
                continue;

            updated_actions_dag_outputs.push_back(&rename_actions_dag->addAlias(*output_node, *column_identifier));
        }

        rename_actions_dag->getOutputs() = std::move(updated_actions_dag_outputs);

        auto rename_step = std::make_unique<ExpressionStep>(query_plan.getCurrentDataStream(), rename_actions_dag);
        rename_step->setStepDescription("Change column names to column identifiers");
        query_plan.addStep(std::move(rename_step));
    }
    else
    {
        SelectQueryOptions analyze_query_options = SelectQueryOptions(from_stage).analyze();
        Planner planner(select_query_info.query_tree,
            analyze_query_options,
            select_query_info.planner_context);
        planner.buildQueryPlanIfNeeded();

        auto expected_header = planner.getQueryPlan().getCurrentDataStream().header;

        if (!blocksHaveEqualStructure(query_plan.getCurrentDataStream().header, expected_header))
        {
            materializeBlockInplace(expected_header);

            auto rename_actions_dag = ActionsDAG::makeConvertingActions(
                query_plan.getCurrentDataStream().header.getColumnsWithTypeAndName(),
                expected_header.getColumnsWithTypeAndName(),
                ActionsDAG::MatchColumnsMode::Position,
                true /*ignore_constant_values*/);
            auto rename_step = std::make_unique<ExpressionStep>(query_plan.getCurrentDataStream(), std::move(rename_actions_dag));
            std::string step_description = table_expression_data.isRemote() ? "Change remote column names to local column names" : "Change column names";
            rename_step->setStepDescription(std::move(step_description));
            query_plan.addStep(std::move(rename_step));
        }
    }

    return JoinTreeQueryPlan{
        .query_plan = std::move(query_plan),
        .from_stage = from_stage,
        .used_row_policies = std::move(used_row_policies),
    };
}

JoinTreeQueryPlan buildQueryPlanForJoinNode(const QueryTreeNodePtr & join_table_expression,
    JoinTreeQueryPlan left_join_tree_query_plan,
    JoinTreeQueryPlan right_join_tree_query_plan,
    const ColumnIdentifierSet & outer_scope_columns,
    PlannerContextPtr & planner_context)
{
    auto & join_node = join_table_expression->as<JoinNode &>();
    if (left_join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
        throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
            "JOIN {} left table expression expected to process query to fetch columns stage. Actual {}",
            join_node.formatASTForErrorMessage(),
            QueryProcessingStage::toString(left_join_tree_query_plan.from_stage));

    auto left_plan = std::move(left_join_tree_query_plan.query_plan);
    auto left_plan_output_columns = left_plan.getCurrentDataStream().header.getColumnsWithTypeAndName();
    if (right_join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
        throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
            "JOIN {} right table expression expected to process query to fetch columns stage. Actual {}",
            join_node.formatASTForErrorMessage(),
            QueryProcessingStage::toString(right_join_tree_query_plan.from_stage));

    auto right_plan = std::move(right_join_tree_query_plan.query_plan);
    auto right_plan_output_columns = right_plan.getCurrentDataStream().header.getColumnsWithTypeAndName();

    JoinClausesAndActions join_clauses_and_actions;
    JoinKind join_kind = join_node.getKind();
    JoinStrictness join_strictness = join_node.getStrictness();

    std::optional<bool> join_constant;

    if (join_strictness == JoinStrictness::All || join_strictness == JoinStrictness::Semi  || join_strictness == JoinStrictness::Anti)
        join_constant = tryExtractConstantFromJoinNode(join_table_expression);

    if (join_constant)
    {
        /** If there is JOIN with always true constant, we transform it to cross.
          * If there is JOIN with always false constant, we do not process JOIN keys.
          * It is expected by join algorithm to handle such case.
          *
          * Example: SELECT * FROM test_table AS t1 INNER JOIN test_table AS t2 ON 1;
          */
        if (*join_constant)
            join_kind = JoinKind::Cross;
    }
    else if (join_node.isOnJoinExpression())
    {
        join_clauses_and_actions = buildJoinClausesAndActions(left_plan_output_columns,
            right_plan_output_columns,
            join_table_expression,
            planner_context);

        join_clauses_and_actions.left_join_expressions_actions->projectInput();
        auto left_join_expressions_actions_step = std::make_unique<ExpressionStep>(left_plan.getCurrentDataStream(), join_clauses_and_actions.left_join_expressions_actions);
        left_join_expressions_actions_step->setStepDescription("JOIN actions");
        left_plan.addStep(std::move(left_join_expressions_actions_step));

        join_clauses_and_actions.right_join_expressions_actions->projectInput();
        auto right_join_expressions_actions_step = std::make_unique<ExpressionStep>(right_plan.getCurrentDataStream(), join_clauses_and_actions.right_join_expressions_actions);
        right_join_expressions_actions_step->setStepDescription("JOIN actions");
        right_plan.addStep(std::move(right_join_expressions_actions_step));
    }

    std::unordered_map<ColumnIdentifier, DataTypePtr> left_plan_column_name_to_cast_type;
    std::unordered_map<ColumnIdentifier, DataTypePtr> right_plan_column_name_to_cast_type;

    if (join_node.isUsingJoinExpression())
    {
        auto & join_node_using_columns_list = join_node.getJoinExpression()->as<ListNode &>();
        for (auto & join_node_using_node : join_node_using_columns_list.getNodes())
        {
            auto & join_node_using_column_node = join_node_using_node->as<ColumnNode &>();
            auto & inner_columns_list = join_node_using_column_node.getExpressionOrThrow()->as<ListNode &>();

            auto & left_inner_column_node = inner_columns_list.getNodes().at(0);
            auto & left_inner_column = left_inner_column_node->as<ColumnNode &>();

            auto & right_inner_column_node = inner_columns_list.getNodes().at(1);
            auto & right_inner_column = right_inner_column_node->as<ColumnNode &>();

            const auto & join_node_using_column_node_type = join_node_using_column_node.getColumnType();
            if (!left_inner_column.getColumnType()->equals(*join_node_using_column_node_type))
            {
                const auto & left_inner_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(left_inner_column_node);
                left_plan_column_name_to_cast_type.emplace(left_inner_column_identifier, join_node_using_column_node_type);
            }

            if (!right_inner_column.getColumnType()->equals(*join_node_using_column_node_type))
            {
                const auto & right_inner_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(right_inner_column_node);
                right_plan_column_name_to_cast_type.emplace(right_inner_column_identifier, join_node_using_column_node_type);
            }
        }
    }

    auto join_cast_plan_output_nodes = [&](QueryPlan & plan_to_add_cast, std::unordered_map<std::string, DataTypePtr> & plan_column_name_to_cast_type)
    {
        auto cast_actions_dag = std::make_shared<ActionsDAG>(plan_to_add_cast.getCurrentDataStream().header.getColumnsWithTypeAndName());

        for (auto & output_node : cast_actions_dag->getOutputs())
        {
            auto it = plan_column_name_to_cast_type.find(output_node->result_name);
            if (it == plan_column_name_to_cast_type.end())
                continue;

            const auto & cast_type = it->second;
            output_node = &cast_actions_dag->addCast(*output_node, cast_type, output_node->result_name);
        }

        cast_actions_dag->projectInput();
        auto cast_join_columns_step
            = std::make_unique<ExpressionStep>(plan_to_add_cast.getCurrentDataStream(), std::move(cast_actions_dag));
        cast_join_columns_step->setStepDescription("Cast JOIN USING columns");
        plan_to_add_cast.addStep(std::move(cast_join_columns_step));
    };

    if (!left_plan_column_name_to_cast_type.empty())
        join_cast_plan_output_nodes(left_plan, left_plan_column_name_to_cast_type);

    if (!right_plan_column_name_to_cast_type.empty())
        join_cast_plan_output_nodes(right_plan, right_plan_column_name_to_cast_type);

    const auto & query_context = planner_context->getQueryContext();
    const auto & settings = query_context->getSettingsRef();

    bool join_use_nulls = settings.join_use_nulls;
    auto to_nullable_function = FunctionFactory::instance().get("toNullable", query_context);

    auto join_cast_plan_columns_to_nullable = [&](QueryPlan & plan_to_add_cast)
    {
        auto cast_actions_dag = std::make_shared<ActionsDAG>(plan_to_add_cast.getCurrentDataStream().header.getColumnsWithTypeAndName());

        for (auto & output_node : cast_actions_dag->getOutputs())
        {
            if (planner_context->getGlobalPlannerContext()->hasColumnIdentifier(output_node->result_name))
            {
                DataTypePtr type_to_check = output_node->result_type;
                if (const auto * type_to_check_low_cardinality = typeid_cast<const DataTypeLowCardinality *>(type_to_check.get()))
                    type_to_check = type_to_check_low_cardinality->getDictionaryType();

                if (type_to_check->canBeInsideNullable())
                    output_node = &cast_actions_dag->addFunction(to_nullable_function, {output_node}, output_node->result_name);
            }
        }

        cast_actions_dag->projectInput();
        auto cast_join_columns_step = std::make_unique<ExpressionStep>(plan_to_add_cast.getCurrentDataStream(), std::move(cast_actions_dag));
        cast_join_columns_step->setStepDescription("Cast JOIN columns to Nullable");
        plan_to_add_cast.addStep(std::move(cast_join_columns_step));
    };

    if (join_use_nulls)
    {
        if (isFull(join_kind))
        {
            join_cast_plan_columns_to_nullable(left_plan);
            join_cast_plan_columns_to_nullable(right_plan);
        }
        else if (isLeft(join_kind))
        {
            join_cast_plan_columns_to_nullable(right_plan);
        }
        else if (isRight(join_kind))
        {
            join_cast_plan_columns_to_nullable(left_plan);
        }
    }

    auto table_join = std::make_shared<TableJoin>(settings, query_context->getGlobalTemporaryVolume());
    table_join->getTableJoin() = join_node.toASTTableJoin()->as<ASTTableJoin &>();
    table_join->getTableJoin().kind = join_kind;

    if (join_kind == JoinKind::Comma)
    {
        join_kind = JoinKind::Cross;
        table_join->getTableJoin().kind = JoinKind::Cross;
    }

    table_join->setIsJoinWithConstant(join_constant != std::nullopt);

    if (join_node.isOnJoinExpression())
    {
        const auto & join_clauses = join_clauses_and_actions.join_clauses;
        bool is_asof = table_join->strictness() == JoinStrictness::Asof;

        if (join_clauses.size() > 1)
        {
            if (is_asof)
                throw Exception(ErrorCodes::NOT_IMPLEMENTED,
                    "ASOF join {} doesn't support multiple ORs for keys in JOIN ON section",
                    join_node.formatASTForErrorMessage());
        }

        auto & table_join_clauses = table_join->getClauses();

        for (const auto & join_clause : join_clauses)
        {
            table_join_clauses.emplace_back();
            auto & table_join_clause = table_join_clauses.back();

            const auto & join_clause_left_key_nodes = join_clause.getLeftKeyNodes();
            const auto & join_clause_right_key_nodes = join_clause.getRightKeyNodes();

            size_t join_clause_key_nodes_size = join_clause_left_key_nodes.size();
            chassert(join_clause_key_nodes_size == join_clause_right_key_nodes.size());

            for (size_t i = 0; i < join_clause_key_nodes_size; ++i)
            {
                table_join_clause.addKey(join_clause_left_key_nodes[i]->result_name,
                                         join_clause_right_key_nodes[i]->result_name,
                                         join_clause.isNullsafeCompareKey(i));
            }

            const auto & join_clause_get_left_filter_condition_nodes = join_clause.getLeftFilterConditionNodes();
            if (!join_clause_get_left_filter_condition_nodes.empty())
            {
                if (join_clause_get_left_filter_condition_nodes.size() != 1)
                    throw Exception(ErrorCodes::LOGICAL_ERROR,
                        "JOIN {} left filter conditions size must be 1. Actual {}",
                        join_node.formatASTForErrorMessage(),
                        join_clause_get_left_filter_condition_nodes.size());

                const auto & join_clause_left_filter_condition_name = join_clause_get_left_filter_condition_nodes[0]->result_name;
                table_join_clause.analyzer_left_filter_condition_column_name = join_clause_left_filter_condition_name;
            }

            const auto & join_clause_get_right_filter_condition_nodes = join_clause.getRightFilterConditionNodes();
            if (!join_clause_get_right_filter_condition_nodes.empty())
            {
                if (join_clause_get_right_filter_condition_nodes.size() != 1)
                    throw Exception(ErrorCodes::LOGICAL_ERROR,
                        "JOIN {} right filter conditions size must be 1. Actual {}",
                        join_node.formatASTForErrorMessage(),
                        join_clause_get_right_filter_condition_nodes.size());

                const auto & join_clause_right_filter_condition_name = join_clause_get_right_filter_condition_nodes[0]->result_name;
                table_join_clause.analyzer_right_filter_condition_column_name = join_clause_right_filter_condition_name;
            }

            if (is_asof)
            {
                if (!join_clause.hasASOF())
                    throw Exception(ErrorCodes::INVALID_JOIN_ON_EXPRESSION,
                        "JOIN {} no inequality in ASOF JOIN ON section.",
                        join_node.formatASTForErrorMessage());

                if (table_join_clause.key_names_left.size() <= 1)
                    throw Exception(ErrorCodes::SYNTAX_ERROR,
                        "JOIN {} ASOF join needs at least one equi-join column",
                        join_node.formatASTForErrorMessage());
            }

            if (join_clause.hasASOF())
            {
                const auto & asof_conditions = join_clause.getASOFConditions();
                assert(asof_conditions.size() == 1);

                const auto & asof_condition = asof_conditions[0];
                table_join->setAsofInequality(asof_condition.asof_inequality);

                /// Execution layer of JOIN algorithms expects that ASOF keys are last JOIN keys
                std::swap(table_join_clause.key_names_left.at(asof_condition.key_index), table_join_clause.key_names_left.back());
                std::swap(table_join_clause.key_names_right.at(asof_condition.key_index), table_join_clause.key_names_right.back());
            }
        }
    }
    else if (join_node.isUsingJoinExpression())
    {
        auto & table_join_clauses = table_join->getClauses();
        table_join_clauses.emplace_back();
        auto & table_join_clause = table_join_clauses.back();

        auto & using_list = join_node.getJoinExpression()->as<ListNode &>();

        for (auto & join_using_node : using_list.getNodes())
        {
            auto & join_using_column_node = join_using_node->as<ColumnNode &>();
            auto & using_join_columns_list = join_using_column_node.getExpressionOrThrow()->as<ListNode &>();
            auto & using_join_left_join_column_node = using_join_columns_list.getNodes().at(0);
            auto & using_join_right_join_column_node = using_join_columns_list.getNodes().at(1);

            const auto & left_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(using_join_left_join_column_node);
            const auto & right_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(using_join_right_join_column_node);

            table_join_clause.key_names_left.push_back(left_column_identifier);
            table_join_clause.key_names_right.push_back(right_column_identifier);
        }
    }

    const Block & left_header = left_plan.getCurrentDataStream().header;
    auto left_table_names = left_header.getNames();
    NameSet left_table_names_set(left_table_names.begin(), left_table_names.end());

    auto columns_from_joined_table = right_plan.getCurrentDataStream().header.getNamesAndTypesList();
    table_join->setColumnsFromJoinedTable(columns_from_joined_table, left_table_names_set, "");

    for (auto & column_from_joined_table : columns_from_joined_table)
    {
        /// Add columns from joined table only if they are presented in outer scope, otherwise they can be dropped
        if (planner_context->getGlobalPlannerContext()->hasColumnIdentifier(column_from_joined_table.name) &&
            outer_scope_columns.contains(column_from_joined_table.name))
            table_join->addJoinedColumn(column_from_joined_table);
    }

    const Block & right_header = right_plan.getCurrentDataStream().header;
    auto join_algorithm = chooseJoinAlgorithm(table_join, join_node.getRightTableExpression(), left_header, right_header, planner_context);

    auto result_plan = QueryPlan();

    if (join_algorithm->isFilled())
    {
        auto filled_join_step = std::make_unique<FilledJoinStep>(
            left_plan.getCurrentDataStream(),
            join_algorithm,
            settings.max_block_size);

        filled_join_step->setStepDescription("Filled JOIN");
        left_plan.addStep(std::move(filled_join_step));

        result_plan = std::move(left_plan);
    }
    else
    {
        auto add_sorting = [&] (QueryPlan & plan, const Names & key_names, JoinTableSide join_table_side)
        {
            SortDescription sort_description;
            sort_description.reserve(key_names.size());
            for (const auto & key_name : key_names)
                sort_description.emplace_back(key_name);

            SortingStep::Settings sort_settings(*query_context);

            auto sorting_step = std::make_unique<SortingStep>(
                plan.getCurrentDataStream(),
                std::move(sort_description),
                0 /*limit*/,
                sort_settings,
                settings.optimize_sorting_by_input_stream_properties);
            sorting_step->setStepDescription(fmt::format("Sort {} before JOIN", join_table_side));
            plan.addStep(std::move(sorting_step));
        };

        auto crosswise_connection = CreateSetAndFilterOnTheFlyStep::createCrossConnection();
        auto add_create_set = [&settings, crosswise_connection](QueryPlan & plan, const Names & key_names, JoinTableSide join_table_side)
        {
            auto creating_set_step = std::make_unique<CreateSetAndFilterOnTheFlyStep>(
                plan.getCurrentDataStream(),
                key_names,
                settings.max_rows_in_set_to_optimize_join,
                crosswise_connection,
                join_table_side);
            creating_set_step->setStepDescription(fmt::format("Create set and filter {} joined stream", join_table_side));

            auto * step_raw_ptr = creating_set_step.get();
            plan.addStep(std::move(creating_set_step));
            return step_raw_ptr;
        };

        if (join_algorithm->pipelineType() == JoinPipelineType::YShaped)
        {
            const auto & join_clause = table_join->getOnlyClause();

            bool kind_allows_filtering = isInner(join_kind) || isLeft(join_kind) || isRight(join_kind);

            auto has_non_const = [](const Block & block, const auto & keys)
            {
                for (const auto & key : keys)
                {
                    const auto & column = block.getByName(key).column;
                    if (column && !isColumnConst(*column))
                        return true;
                }
                return false;
            };

            /// This optimization relies on the sorting that should buffer data from both streams before emitting any rows.
            /// Sorting on a stream with const keys can start returning rows immediately and pipeline may stuck.
            /// Note: it's also doesn't work with the read-in-order optimization.
            /// No checks here because read in order is not applied if we have `CreateSetAndFilterOnTheFlyStep` in the pipeline between the reading and sorting steps.
            bool has_non_const_keys = has_non_const(left_plan.getCurrentDataStream().header, join_clause.key_names_left)
                && has_non_const(right_plan.getCurrentDataStream().header, join_clause.key_names_right);

            if (settings.max_rows_in_set_to_optimize_join > 0 && kind_allows_filtering && has_non_const_keys)
            {
                auto * left_set = add_create_set(left_plan, join_clause.key_names_left, JoinTableSide::Left);
                auto * right_set = add_create_set(right_plan, join_clause.key_names_right, JoinTableSide::Right);

                if (isInnerOrLeft(join_kind))
                    right_set->setFiltering(left_set->getSet());

                if (isInnerOrRight(join_kind))
                    left_set->setFiltering(right_set->getSet());
            }

            add_sorting(left_plan, join_clause.key_names_left, JoinTableSide::Left);
            add_sorting(right_plan, join_clause.key_names_right, JoinTableSide::Right);
        }

        auto join_pipeline_type = join_algorithm->pipelineType();
        auto join_step = std::make_unique<JoinStep>(
            left_plan.getCurrentDataStream(),
            right_plan.getCurrentDataStream(),
            std::move(join_algorithm),
            settings.max_block_size,
            settings.max_threads,
            false /*optimize_read_in_order*/);

        join_step->setStepDescription(fmt::format("JOIN {}", join_pipeline_type));

        std::vector<QueryPlanPtr> plans;
        plans.emplace_back(std::make_unique<QueryPlan>(std::move(left_plan)));
        plans.emplace_back(std::make_unique<QueryPlan>(std::move(right_plan)));

        result_plan.unitePlans(std::move(join_step), {std::move(plans)});
    }

    auto drop_unused_columns_after_join_actions_dag = std::make_shared<ActionsDAG>(result_plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
    ActionsDAG::NodeRawConstPtrs drop_unused_columns_after_join_actions_dag_updated_outputs;
    std::unordered_set<std::string_view> drop_unused_columns_after_join_actions_dag_updated_outputs_names;
    std::optional<size_t> first_skipped_column_node_index;

    auto & drop_unused_columns_after_join_actions_dag_outputs = drop_unused_columns_after_join_actions_dag->getOutputs();
    size_t drop_unused_columns_after_join_actions_dag_outputs_size = drop_unused_columns_after_join_actions_dag_outputs.size();

    for (size_t i = 0; i < drop_unused_columns_after_join_actions_dag_outputs_size; ++i)
    {
        const auto & output = drop_unused_columns_after_join_actions_dag_outputs[i];

        const auto & global_planner_context = planner_context->getGlobalPlannerContext();
        if (drop_unused_columns_after_join_actions_dag_updated_outputs_names.contains(output->result_name)
            || !global_planner_context->hasColumnIdentifier(output->result_name))
            continue;

        if (!outer_scope_columns.contains(output->result_name))
        {
            if (!first_skipped_column_node_index)
                first_skipped_column_node_index = i;
            continue;
        }

        drop_unused_columns_after_join_actions_dag_updated_outputs.push_back(output);
        drop_unused_columns_after_join_actions_dag_updated_outputs_names.insert(output->result_name);
    }

    /** It is expected that JOIN TREE query plan will contain at least 1 column, even if there are no columns in outer scope.
      *
      * Example: SELECT count() FROM test_table_1 AS t1, test_table_2 AS t2;
      */
    if (drop_unused_columns_after_join_actions_dag_updated_outputs.empty() && first_skipped_column_node_index)
        drop_unused_columns_after_join_actions_dag_updated_outputs.push_back(drop_unused_columns_after_join_actions_dag_outputs[*first_skipped_column_node_index]);

    drop_unused_columns_after_join_actions_dag_outputs = std::move(drop_unused_columns_after_join_actions_dag_updated_outputs);

    auto drop_unused_columns_after_join_transform_step = std::make_unique<ExpressionStep>(result_plan.getCurrentDataStream(), std::move(drop_unused_columns_after_join_actions_dag));
    drop_unused_columns_after_join_transform_step->setStepDescription("DROP unused columns after JOIN");
    result_plan.addStep(std::move(drop_unused_columns_after_join_transform_step));

    for (const auto & right_join_tree_query_plan_row_policy : right_join_tree_query_plan.used_row_policies)
        left_join_tree_query_plan.used_row_policies.insert(right_join_tree_query_plan_row_policy);

    /// Collect all required actions dags in `left_join_tree_query_plan.actions_dags`
    for (auto && action_dag : right_join_tree_query_plan.actions_dags)
        left_join_tree_query_plan.actions_dags.emplace_back(action_dag);
    if (join_clauses_and_actions.left_join_expressions_actions)
        left_join_tree_query_plan.actions_dags.emplace_back(std::move(join_clauses_and_actions.left_join_expressions_actions));
    if (join_clauses_and_actions.right_join_expressions_actions)
        left_join_tree_query_plan.actions_dags.emplace_back(std::move(join_clauses_and_actions.right_join_expressions_actions));

    return JoinTreeQueryPlan{
        .query_plan = std::move(result_plan),
        .from_stage = QueryProcessingStage::FetchColumns,
        .used_row_policies = std::move(left_join_tree_query_plan.used_row_policies),
        .actions_dags = std::move(left_join_tree_query_plan.actions_dags),
    };
}

JoinTreeQueryPlan buildQueryPlanForArrayJoinNode(const QueryTreeNodePtr & array_join_table_expression,
    JoinTreeQueryPlan join_tree_query_plan,
    const ColumnIdentifierSet & outer_scope_columns,
    PlannerContextPtr & planner_context)
{
    auto & array_join_node = array_join_table_expression->as<ArrayJoinNode &>();
    if (join_tree_query_plan.from_stage != QueryProcessingStage::FetchColumns)
        throw Exception(ErrorCodes::UNSUPPORTED_METHOD,
            "ARRAY JOIN {} table expression expected to process query to fetch columns stage. Actual {}",
            array_join_node.formatASTForErrorMessage(),
            QueryProcessingStage::toString(join_tree_query_plan.from_stage));

    auto plan = std::move(join_tree_query_plan.query_plan);
    auto plan_output_columns = plan.getCurrentDataStream().header.getColumnsWithTypeAndName();

    ActionsDAGPtr array_join_action_dag = std::make_shared<ActionsDAG>(plan_output_columns);
    PlannerActionsVisitor actions_visitor(planner_context);
    std::unordered_set<std::string> array_join_expressions_output_nodes;

    NameSet array_join_column_names;
    for (auto & array_join_expression : array_join_node.getJoinExpressions().getNodes())
    {
        const auto & array_join_column_identifier = planner_context->getColumnNodeIdentifierOrThrow(array_join_expression);
        array_join_column_names.insert(array_join_column_identifier);

        auto & array_join_expression_column = array_join_expression->as<ColumnNode &>();
        auto expression_dag_index_nodes = actions_visitor.visit(array_join_action_dag, array_join_expression_column.getExpressionOrThrow());

        for (auto & expression_dag_index_node : expression_dag_index_nodes)
        {
            const auto * array_join_column_node = &array_join_action_dag->addAlias(*expression_dag_index_node, array_join_column_identifier);
            array_join_action_dag->getOutputs().push_back(array_join_column_node);
            array_join_expressions_output_nodes.insert(array_join_column_node->result_name);
        }
    }

    array_join_action_dag->projectInput();

    join_tree_query_plan.actions_dags.push_back(array_join_action_dag);

    auto array_join_actions = std::make_unique<ExpressionStep>(plan.getCurrentDataStream(), array_join_action_dag);
    array_join_actions->setStepDescription("ARRAY JOIN actions");
    plan.addStep(std::move(array_join_actions));

    auto drop_unused_columns_before_array_join_actions_dag = std::make_shared<ActionsDAG>(plan.getCurrentDataStream().header.getColumnsWithTypeAndName());
    ActionsDAG::NodeRawConstPtrs drop_unused_columns_before_array_join_actions_dag_updated_outputs;
    std::unordered_set<std::string_view> drop_unused_columns_before_array_join_actions_dag_updated_outputs_names;

    auto & drop_unused_columns_before_array_join_actions_dag_outputs = drop_unused_columns_before_array_join_actions_dag->getOutputs();
    size_t drop_unused_columns_before_array_join_actions_dag_outputs_size = drop_unused_columns_before_array_join_actions_dag_outputs.size();

    for (size_t i = 0; i < drop_unused_columns_before_array_join_actions_dag_outputs_size; ++i)
    {
        const auto & output = drop_unused_columns_before_array_join_actions_dag_outputs[i];

        if (drop_unused_columns_before_array_join_actions_dag_updated_outputs_names.contains(output->result_name))
            continue;

        if (!array_join_expressions_output_nodes.contains(output->result_name) &&
            !outer_scope_columns.contains(output->result_name))
            continue;

        drop_unused_columns_before_array_join_actions_dag_updated_outputs.push_back(output);
        drop_unused_columns_before_array_join_actions_dag_updated_outputs_names.insert(output->result_name);
    }

    drop_unused_columns_before_array_join_actions_dag_outputs = std::move(drop_unused_columns_before_array_join_actions_dag_updated_outputs);

    auto drop_unused_columns_before_array_join_transform_step = std::make_unique<ExpressionStep>(plan.getCurrentDataStream(),
        std::move(drop_unused_columns_before_array_join_actions_dag));
    drop_unused_columns_before_array_join_transform_step->setStepDescription("DROP unused columns before ARRAY JOIN");
    plan.addStep(std::move(drop_unused_columns_before_array_join_transform_step));

    auto array_join_action = std::make_shared<ArrayJoinAction>(array_join_column_names, array_join_node.isLeft(), planner_context->getQueryContext());
    auto array_join_step = std::make_unique<ArrayJoinStep>(plan.getCurrentDataStream(), std::move(array_join_action));
    array_join_step->setStepDescription("ARRAY JOIN");
    plan.addStep(std::move(array_join_step));

    return JoinTreeQueryPlan{
        .query_plan = std::move(plan),
        .from_stage = QueryProcessingStage::FetchColumns,
        .used_row_policies = std::move(join_tree_query_plan.used_row_policies),
        .actions_dags = std::move(join_tree_query_plan.actions_dags),
    };
}

}

JoinTreeQueryPlan buildJoinTreeQueryPlan(const QueryTreeNodePtr & query_node,
    const SelectQueryInfo & select_query_info,
    SelectQueryOptions & select_query_options,
    const ColumnIdentifierSet & outer_scope_columns,
    PlannerContextPtr & planner_context)
{
    auto table_expressions_stack = buildTableExpressionsStack(query_node->as<QueryNode &>().getJoinTree());
    size_t table_expressions_stack_size = table_expressions_stack.size();
    bool is_single_table_expression = table_expressions_stack_size == 1;

    std::vector<ColumnIdentifierSet> table_expressions_outer_scope_columns(table_expressions_stack_size);
    ColumnIdentifierSet current_outer_scope_columns = outer_scope_columns;

    if (is_single_table_expression)
    {
        auto * table_node = table_expressions_stack[0]->as<TableNode>();
        if (table_node && shouldIgnoreQuotaAndLimits(*table_node))
        {
            select_query_options.ignore_quota = true;
            select_query_options.ignore_limits = true;
        }
    }

    /// For each table, table function, query, union table expressions prepare before query plan build
    for (size_t i = 0; i < table_expressions_stack_size; ++i)
    {
        const auto & table_expression = table_expressions_stack[i];
        auto table_expression_type = table_expression->getNodeType();
        if (table_expression_type == QueryTreeNodeType::JOIN ||
            table_expression_type == QueryTreeNodeType::ARRAY_JOIN)
            continue;

        prepareBuildQueryPlanForTableExpression(table_expression, planner_context);
    }

    /** If left most table expression query plan is planned to stage that is not equal to fetch columns,
      * then left most table expression is responsible for providing valid JOIN TREE part of final query plan.
      *
      * Examples: Distributed, LiveView, Merge storages.
      */
    auto left_table_expression = table_expressions_stack.front();
    auto left_table_expression_query_plan = buildQueryPlanForTableExpression(left_table_expression,
        select_query_info,
        select_query_options,
        planner_context,
        is_single_table_expression,
        false /*wrap_read_columns_in_subquery*/);
    if (left_table_expression_query_plan.from_stage != QueryProcessingStage::FetchColumns)
        return left_table_expression_query_plan;

    for (Int64 i = static_cast<Int64>(table_expressions_stack_size) - 1; i >= 0; --i)
    {
        table_expressions_outer_scope_columns[i] = current_outer_scope_columns;
        auto & table_expression = table_expressions_stack[i];
        auto table_expression_type = table_expression->getNodeType();

        if (table_expression_type == QueryTreeNodeType::JOIN)
            collectTopLevelColumnIdentifiers(table_expression, planner_context, current_outer_scope_columns);
        else if (table_expression_type == QueryTreeNodeType::ARRAY_JOIN)
            collectTopLevelColumnIdentifiers(table_expression, planner_context, current_outer_scope_columns);
    }

    std::vector<JoinTreeQueryPlan> query_plans_stack;

    for (size_t i = 0; i < table_expressions_stack_size; ++i)
    {
        const auto & table_expression = table_expressions_stack[i];
        auto table_expression_node_type = table_expression->getNodeType();

        if (table_expression_node_type == QueryTreeNodeType::ARRAY_JOIN)
        {
            if (query_plans_stack.empty())
                throw Exception(ErrorCodes::LOGICAL_ERROR,
                    "Expected at least 1 query plan on stack before ARRAY JOIN processing. Actual {}",
                    query_plans_stack.size());

            auto query_plan = std::move(query_plans_stack.back());
            query_plans_stack.back() = buildQueryPlanForArrayJoinNode(table_expression,
                std::move(query_plan),
                table_expressions_outer_scope_columns[i],
                planner_context);
        }
        else if (table_expression_node_type == QueryTreeNodeType::JOIN)
        {
            if (query_plans_stack.size() < 2)
                throw Exception(ErrorCodes::LOGICAL_ERROR,
                    "Expected at least 2 query plans on stack before JOIN processing. Actual {}",
                    query_plans_stack.size());

            auto right_query_plan = std::move(query_plans_stack.back());
            query_plans_stack.pop_back();

            auto left_query_plan = std::move(query_plans_stack.back());
            query_plans_stack.pop_back();

            query_plans_stack.push_back(buildQueryPlanForJoinNode(table_expression,
                std::move(left_query_plan),
                std::move(right_query_plan),
                table_expressions_outer_scope_columns[i],
                planner_context));
        }
        else
        {
            if (table_expression == left_table_expression)
            {
                query_plans_stack.push_back(std::move(left_table_expression_query_plan)); /// NOLINT
                left_table_expression = {};
                continue;
            }

            /** If table expression is remote and it is not left most table expression, we wrap read columns from such
              * table expression in subquery.
              */
            bool is_remote = planner_context->getTableExpressionDataOrThrow(table_expression).isRemote();
            query_plans_stack.push_back(buildQueryPlanForTableExpression(table_expression,
                select_query_info,
                select_query_options,
                planner_context,
                is_single_table_expression,
                is_remote /*wrap_read_columns_in_subquery*/));
        }
    }

    if (query_plans_stack.size() != 1)
        throw Exception(ErrorCodes::LOGICAL_ERROR,
            "Expected 1 query plan for JOIN TREE. Actual {}",
            query_plans_stack.size());

    return std::move(query_plans_stack.back());
}

}