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274 lines
11 KiB
C++
274 lines
11 KiB
C++
#pragma once
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#include <memory>
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#include <Core/QueryProcessingStage.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <DataStreams/IBlockStream_fwd.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/IInterpreter.h>
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#include <Interpreters/SelectQueryOptions.h>
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#include <Storages/SelectQueryInfo.h>
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#include <Storages/TableStructureLockHolder.h>
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#include <Storages/ReadInOrderOptimizer.h>
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#include <Interpreters/StorageID.h>
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#include <Processors/QueryPipeline.h>
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#include <Columns/FilterDescription.h>
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namespace Poco { class Logger; }
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namespace DB
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{
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struct SubqueryForSet;
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class InterpreterSelectWithUnionQuery;
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struct SyntaxAnalyzerResult;
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using SyntaxAnalyzerResultPtr = std::shared_ptr<const SyntaxAnalyzerResult>;
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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 IInterpreter
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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 Context & 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 source `input`.
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const Context & context_,
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const BlockInputStreamPtr & input_,
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const SelectQueryOptions & = {});
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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 Context & 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 Context & context_,
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const StoragePtr & storage_,
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const SelectQueryOptions & = {});
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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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/// Execute the query and return multuple streams for parallel processing.
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BlockInputStreams executeWithMultipleStreams(QueryPipeline & parent_pipeline);
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QueryPipeline executeWithProcessors() override;
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bool canExecuteWithProcessors() const override { return true; }
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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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Block getSampleBlock();
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void ignoreWithTotals();
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ASTPtr getQuery() const { return query_ptr; }
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size_t getMaxStreams() const { return max_streams; }
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private:
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InterpreterSelectQuery(
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const ASTPtr & query_ptr_,
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const Context & context_,
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const BlockInputStreamPtr & input_,
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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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ASTSelectQuery & getSelectQuery() { return query_ptr->as<ASTSelectQuery &>(); }
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Block getSampleBlockImpl(bool try_move_to_prewhere);
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struct Pipeline
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{
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/** Streams of data.
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* The source data streams are produced in the executeFetchColumns function.
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* Then they are converted (wrapped in other streams) using the `execute*` functions,
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* to get the whole pipeline running the query.
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*/
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BlockInputStreams streams;
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/** When executing FULL or RIGHT JOIN, there will be a data stream from which you can read "not joined" rows.
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* It has a special meaning, since reading from it should be done after reading from the main streams.
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* It is appended to the main streams in UnionBlockInputStream or ParallelAggregatingBlockInputStream.
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*/
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BlockInputStreamPtr stream_with_non_joined_data;
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bool union_stream = false;
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/// Cache value of InterpreterSelectQuery::max_streams
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size_t max_threads = 1;
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BlockInputStreamPtr & firstStream() { return streams.at(0); }
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template <typename Transform>
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void transform(Transform && transformation)
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{
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for (auto & stream : streams)
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transformation(stream);
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if (stream_with_non_joined_data)
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transformation(stream_with_non_joined_data);
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}
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bool hasMoreThanOneStream() const
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{
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return streams.size() + (stream_with_non_joined_data ? 1 : 0) > 1;
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}
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/// Resulting stream is mix of other streams data. Distinct and/or order guaranties are broken.
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bool hasMixedStreams() const
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{
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return hasMoreThanOneStream() || union_stream;
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}
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bool hasDelayedStream() const { return stream_with_non_joined_data != nullptr; }
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bool initialized() const { return !streams.empty(); }
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/// Compatibility with QueryPipeline (Processors)
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void setMaxThreads(size_t max_threads_) { max_threads = max_threads_; }
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size_t getNumThreads() const { return max_threads; }
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};
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template <typename TPipeline>
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void executeImpl(TPipeline & pipeline, const BlockInputStreamPtr & prepared_input, std::optional<Pipe> prepared_pipe, QueryPipeline & save_context_and_storage);
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/// Different stages of query execution.
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/// dry_run - don't read from table, use empty header block instead.
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void executeWithMultipleStreamsImpl(Pipeline & pipeline, const BlockInputStreamPtr & input, bool dry_run);
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template <typename TPipeline>
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void executeFetchColumns(QueryProcessingStage::Enum processing_stage, TPipeline & pipeline,
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const PrewhereInfoPtr & prewhere_info,
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const Names & columns_to_remove_after_prewhere,
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QueryPipeline & save_context_and_storage);
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void executeWhere(Pipeline & pipeline, const ExpressionActionsPtr & expression, bool remove_filter);
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void executeAggregation(Pipeline & pipeline, const ExpressionActionsPtr & expression, bool overflow_row, bool final);
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void executeMergeAggregated(Pipeline & pipeline, bool overflow_row, bool final);
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void executeTotalsAndHaving(Pipeline & pipeline, bool has_having, const ExpressionActionsPtr & expression, bool overflow_row, bool final);
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void executeHaving(Pipeline & pipeline, const ExpressionActionsPtr & expression);
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static void executeExpression(Pipeline & pipeline, const ExpressionActionsPtr & expression);
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void executeOrder(Pipeline & pipeline, InputSortingInfoPtr sorting_info);
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void executeWithFill(Pipeline & pipeline);
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void executeMergeSorted(Pipeline & pipeline);
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void executePreLimit(Pipeline & pipeline);
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void executeUnion(Pipeline & pipeline, Block header);
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void executeLimitBy(Pipeline & pipeline);
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void executeLimit(Pipeline & pipeline);
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static void executeProjection(Pipeline & pipeline, const ExpressionActionsPtr & expression);
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void executeDistinct(Pipeline & pipeline, bool before_order, Names columns);
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void executeExtremes(Pipeline & pipeline);
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void executeSubqueriesInSetsAndJoins(Pipeline & pipeline, const std::unordered_map<String, SubqueryForSet> & subqueries_for_sets);
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void executeMergeSorted(Pipeline & pipeline, const SortDescription & sort_description, UInt64 limit);
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void executeWhere(QueryPipeline & pipeline, const ExpressionActionsPtr & expression, bool remove_filter);
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void executeAggregation(QueryPipeline & pipeline, const ExpressionActionsPtr & expression, bool overflow_row, bool final);
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void executeMergeAggregated(QueryPipeline & pipeline, bool overflow_row, bool final);
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void executeTotalsAndHaving(QueryPipeline & pipeline, bool has_having, const ExpressionActionsPtr & expression, bool overflow_row, bool final);
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void executeHaving(QueryPipeline & pipeline, const ExpressionActionsPtr & expression);
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static void executeExpression(QueryPipeline & pipeline, const ExpressionActionsPtr & expression);
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void executeOrder(QueryPipeline & pipeline, InputSortingInfoPtr sorting_info);
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void executeWithFill(QueryPipeline & pipeline);
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void executeMergeSorted(QueryPipeline & pipeline);
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void executePreLimit(QueryPipeline & pipeline, bool do_not_skip_offset);
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void executeLimitBy(QueryPipeline & pipeline);
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void executeLimit(QueryPipeline & pipeline);
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static void executeProjection(QueryPipeline & pipeline, const ExpressionActionsPtr & expression);
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void executeDistinct(QueryPipeline & pipeline, bool before_order, Names columns);
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void executeExtremes(QueryPipeline & pipeline);
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void executeSubqueriesInSetsAndJoins(QueryPipeline & pipeline, const std::unordered_map<String, SubqueryForSet> & subqueries_for_sets);
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void executeMergeSorted(QueryPipeline & pipeline, const SortDescription & sort_description, UInt64 limit);
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String generateFilterActions(ExpressionActionsPtr & actions, const ASTPtr & row_policy_filter, const Names & prerequisite_columns = {}) const;
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/// Add ConvertingBlockInputStream to specified header.
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void unifyStreams(Pipeline & pipeline, Block header);
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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(Pipeline & pipeline, Modificator modificator);
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void executeRollupOrCube(QueryPipeline & pipeline, 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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SelectQueryOptions options;
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ASTPtr query_ptr;
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std::shared_ptr<Context> context;
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SyntaxAnalyzerResultPtr 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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FilterInfoPtr filter_info;
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QueryProcessingStage::Enum from_stage = QueryProcessingStage::FetchColumns;
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/// How many streams we ask for storage to produce, and in how many threads we will do further processing.
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size_t max_streams = 1;
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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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/// Structure of query result.
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Block result_header;
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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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TableStructureReadLockHolder table_lock;
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/// Used when we read from prepared input, not table or subquery.
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BlockInputStreamPtr input;
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std::optional<Pipe> input_pipe;
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Poco::Logger * log;
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};
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}
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