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265 lines
10 KiB
C++
265 lines
10 KiB
C++
#pragma once
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#include <memory>
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#include <optional>
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#include <Access/EnabledRowPolicies.h>
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#include <Core/QueryProcessingStage.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/IInterpreterUnionOrSelectQuery.h>
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#include <Interpreters/PreparedSets.h>
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#include <Interpreters/StorageID.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <Storages/ReadInOrderOptimizer.h>
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#include <Storages/SelectQueryInfo.h>
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#include <Storages/TableLockHolder.h>
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#include <QueryPipeline/Pipe.h>
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#include <Columns/FilterDescription.h>
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namespace Poco
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{
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class Logger;
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}
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namespace DB
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{
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class SubqueryForSet;
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class InterpreterSelectWithUnionQuery;
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class Context;
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class QueryPlan;
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struct GroupingSetsParams;
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using GroupingSetsParamsList = std::vector<GroupingSetsParams>;
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struct TreeRewriterResult;
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using TreeRewriterResultPtr = std::shared_ptr<const TreeRewriterResult>;
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struct RowPolicy;
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using RowPolicyPtr = std::shared_ptr<const RowPolicy>;
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/** Interprets the SELECT query. Returns the stream of blocks with the results of the query before `to_stage` stage.
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*/
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class InterpreterSelectQuery : public IInterpreterUnionOrSelectQuery
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{
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public:
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/**
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* query_ptr
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* - A query AST to interpret.
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*
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* required_result_column_names
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* - don't calculate all columns except the specified ones from the query
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* - it is used to remove calculation (and reading) of unnecessary columns from subqueries.
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* empty means - use all columns.
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*/
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextPtr & context_,
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const SelectQueryOptions &,
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const Names & required_result_column_names_ = Names{});
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextMutablePtr & context_,
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const SelectQueryOptions &,
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const Names & required_result_column_names_ = Names{});
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/// Read data not from the table specified in the query, but from the prepared pipe `input`.
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextPtr & context_,
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Pipe input_pipe_,
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const SelectQueryOptions & = {});
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/// Read data not from the table specified in the query, but from the specified `storage_`.
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextPtr & context_,
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const StoragePtr & storage_,
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const StorageMetadataPtr & metadata_snapshot_ = nullptr,
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const SelectQueryOptions & = {});
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/// Reuse existing prepared_sets for another pass of analysis. It's used for projection.
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/// TODO: Find a general way of sharing sets among different interpreters, such as subqueries.
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextPtr & context_,
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const SelectQueryOptions &,
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PreparedSetsPtr prepared_sets_);
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~InterpreterSelectQuery() override;
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/// Execute a query. Get the stream of blocks to read.
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BlockIO execute() override;
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/// Builds QueryPlan for current query.
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void buildQueryPlan(QueryPlan & query_plan) override;
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bool ignoreLimits() const override { return options.ignore_limits; }
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bool ignoreQuota() const override { return options.ignore_quota; }
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void ignoreWithTotals() override;
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ASTPtr getQuery() const { return query_ptr; }
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const SelectQueryInfo & getQueryInfo() const { return query_info; }
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SelectQueryExpressionAnalyzer * getQueryAnalyzer() const { return query_analyzer.get(); }
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const ExpressionAnalysisResult & getAnalysisResult() const { return analysis_result; }
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const Names & getRequiredColumns() const { return required_columns; }
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bool hasAggregation() const { return query_analyzer->hasAggregation(); }
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static void addEmptySourceToQueryPlan(
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QueryPlan & query_plan, const Block & source_header, const SelectQueryInfo & query_info, const ContextPtr & context_);
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Names getRequiredColumns() { return required_columns; }
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bool supportsTransactions() const override { return true; }
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FilterDAGInfoPtr getAdditionalQueryInfo() const { return additional_filter_info; }
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RowPolicyFilterPtr getRowPolicyFilter() const;
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void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr context) const override;
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static SortDescription getSortDescription(const ASTSelectQuery & query, const ContextPtr & context);
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static UInt64 getLimitForSorting(const ASTSelectQuery & query, const ContextPtr & context);
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static bool isQueryWithFinal(const SelectQueryInfo & info);
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static std::pair<UInt64, UInt64> getLimitLengthAndOffset(const ASTSelectQuery & query, const ContextPtr & context);
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/// Adjust the parallel replicas settings (enabled, disabled) based on the query analysis
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bool adjustParallelReplicasAfterAnalysis();
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private:
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextPtr & context_,
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std::optional<Pipe> input_pipe,
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const StoragePtr & storage_,
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const SelectQueryOptions &,
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const Names & required_result_column_names = {},
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const StorageMetadataPtr & metadata_snapshot_ = nullptr,
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PreparedSetsPtr prepared_sets_ = nullptr);
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const ContextMutablePtr & context_,
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std::optional<Pipe> input_pipe,
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const StoragePtr & storage_,
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const SelectQueryOptions &,
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const Names & required_result_column_names = {},
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const StorageMetadataPtr & metadata_snapshot_ = nullptr,
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PreparedSetsPtr prepared_sets_ = nullptr);
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ASTSelectQuery & getSelectQuery() { return query_ptr->as<ASTSelectQuery &>(); }
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void addPrewhereAliasActions();
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void applyFiltersToPrewhereInAnalysis(ExpressionAnalysisResult & analysis) const;
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bool shouldMoveToPrewhere() const;
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Block getSampleBlockImpl();
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void executeImpl(QueryPlan & query_plan, std::optional<Pipe> prepared_pipe);
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/// Different stages of query execution.
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void executeFetchColumns(QueryProcessingStage::Enum processing_stage, QueryPlan & query_plan);
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void executeWhere(QueryPlan & query_plan, const ActionsDAGPtr & expression, bool remove_filter);
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void executeAggregation(
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QueryPlan & query_plan, const ActionsDAGPtr & expression, bool overflow_row, bool final, InputOrderInfoPtr group_by_info);
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void executeMergeAggregated(QueryPlan & query_plan, bool overflow_row, bool final, bool has_grouping_sets);
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void executeTotalsAndHaving(QueryPlan & query_plan, bool has_having, const ActionsDAGPtr & expression, bool remove_filter, bool overflow_row, bool final);
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void executeHaving(QueryPlan & query_plan, const ActionsDAGPtr & expression, bool remove_filter);
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static void executeExpression(QueryPlan & query_plan, const ActionsDAGPtr & expression, const std::string & description);
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/// FIXME should go through ActionsDAG to behave as a proper function
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void executeWindow(QueryPlan & query_plan);
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void executeOrder(QueryPlan & query_plan, InputOrderInfoPtr sorting_info);
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void executeOrderOptimized(QueryPlan & query_plan, InputOrderInfoPtr sorting_info, UInt64 limit, SortDescription & output_order_descr);
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void executeWithFill(QueryPlan & query_plan);
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void executeMergeSorted(QueryPlan & query_plan, const std::string & description);
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void executePreLimit(QueryPlan & query_plan, bool do_not_skip_offset);
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void executeLimitBy(QueryPlan & query_plan);
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void executeLimit(QueryPlan & query_plan);
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void executeOffset(QueryPlan & query_plan);
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static void executeProjection(QueryPlan & query_plan, const ActionsDAGPtr & expression);
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void executeDistinct(QueryPlan & query_plan, bool before_order, Names columns, bool pre_distinct);
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void executeExtremes(QueryPlan & query_plan);
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void executeSubqueriesInSetsAndJoins(QueryPlan & query_plan);
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bool autoFinalOnQuery(ASTSelectQuery & select_query);
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std::optional<UInt64> getTrivialCount(UInt64 max_parallel_replicas);
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/// Check if we can limit block size to read based on LIMIT clause
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UInt64 maxBlockSizeByLimit() const;
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enum class Modificator
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{
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ROLLUP = 0,
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CUBE = 1,
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};
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void executeRollupOrCube(QueryPlan & query_plan, Modificator modificator);
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/** If there is a SETTINGS section in the SELECT query, then apply settings from it.
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*
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* Section SETTINGS - settings for a specific query.
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* Normally, the settings can be passed in other ways, not inside the query.
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* But the use of this section is justified if you need to set the settings for one subquery.
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*/
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void initSettings();
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TreeRewriterResultPtr syntax_analyzer_result;
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std::unique_ptr<SelectQueryExpressionAnalyzer> query_analyzer;
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SelectQueryInfo query_info;
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/// Is calculated in getSampleBlock. Is used later in readImpl.
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ExpressionAnalysisResult analysis_result;
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/// For row-level security.
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RowPolicyFilterPtr row_policy_filter;
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FilterDAGInfoPtr filter_info;
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/// For additional_filter setting.
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FilterDAGInfoPtr additional_filter_info;
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/// For "per replica" filter when multiple replicas are used
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FilterDAGInfoPtr parallel_replicas_custom_filter_info;
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QueryProcessingStage::Enum from_stage = QueryProcessingStage::FetchColumns;
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/// List of columns to read to execute the query.
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Names required_columns;
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/// Structure of query source (table, subquery, etc).
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Block source_header;
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/// Actions to calculate ALIAS if required.
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ActionsDAGPtr alias_actions;
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/// The subquery interpreter, if the subquery
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std::unique_ptr<InterpreterSelectWithUnionQuery> interpreter_subquery;
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/// Table from where to read data, if not subquery.
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StoragePtr storage;
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StorageID table_id = StorageID::createEmpty(); /// Will be initialized if storage is not nullptr
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TableLockHolder table_lock;
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/// Used when we read from prepared input, not table or subquery.
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std::optional<Pipe> input_pipe;
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Poco::Logger * log;
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StorageMetadataPtr metadata_snapshot;
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StorageSnapshotPtr storage_snapshot;
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/// Reuse already built sets for multiple passes of analysis, possibly across interpreters.
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PreparedSetsPtr prepared_sets;
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};
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}
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