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391 lines
16 KiB
C++
391 lines
16 KiB
C++
#pragma once
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#include <Columns/FilterDescription.h>
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#include <Interpreters/AggregateDescription.h>
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#include <Interpreters/DatabaseCatalog.h>
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#include <Interpreters/SubqueryForSet.h>
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#include <Interpreters/TreeRewriter.h>
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#include <Interpreters/WindowDescription.h>
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#include <Interpreters/join_common.h>
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#include <Parsers/IAST_fwd.h>
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#include <Storages/IStorage_fwd.h>
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#include <Storages/SelectQueryInfo.h>
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namespace DB
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{
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class Block;
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struct Settings;
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struct ExpressionActionsChain;
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class ExpressionActions;
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using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
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using ManyExpressionActions = std::vector<ExpressionActionsPtr>;
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struct ASTTableJoin;
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class IJoin;
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using JoinPtr = std::shared_ptr<IJoin>;
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class ASTFunction;
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class ASTExpressionList;
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class ASTSelectQuery;
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struct ASTTablesInSelectQueryElement;
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struct StorageInMemoryMetadata;
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using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
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class ArrayJoinAction;
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using ArrayJoinActionPtr = std::shared_ptr<ArrayJoinAction>;
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class ActionsDAG;
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using ActionsDAGPtr = std::shared_ptr<ActionsDAG>;
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/// Create columns in block or return false if not possible
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bool sanitizeBlock(Block & block, bool throw_if_cannot_create_column = false);
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/// ExpressionAnalyzer sources, intermediates and results. It splits data and logic, allows to test them separately.
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struct ExpressionAnalyzerData
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{
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~ExpressionAnalyzerData();
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SubqueriesForSets subqueries_for_sets;
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PreparedSets prepared_sets;
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std::unique_ptr<QueryPlan> joined_plan;
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/// Columns after ARRAY JOIN. If there is no ARRAY JOIN, it's source_columns.
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NamesAndTypesList columns_after_array_join;
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/// Columns after Columns after ARRAY JOIN and JOIN. If there is no JOIN, it's columns_after_array_join.
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NamesAndTypesList columns_after_join;
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/// Columns after ARRAY JOIN, JOIN, and/or aggregation.
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NamesAndTypesList aggregated_columns;
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/// Columns after window functions.
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NamesAndTypesList columns_after_window;
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bool has_aggregation = false;
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NamesAndTypesList aggregation_keys;
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bool has_const_aggregation_keys = false;
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AggregateDescriptions aggregate_descriptions;
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WindowDescriptions window_descriptions;
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NamesAndTypesList window_columns;
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bool has_global_subqueries = false;
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/// All new temporary tables obtained by performing the GLOBAL IN/JOIN subqueries.
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TemporaryTablesMapping external_tables;
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};
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/** Transforms an expression from a syntax tree into a sequence of actions to execute it.
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*
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* NOTE: if `ast` is a SELECT query from a table, the structure of this table should not change during the lifetime of ExpressionAnalyzer.
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*/
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class ExpressionAnalyzer : protected ExpressionAnalyzerData, private boost::noncopyable, protected WithContext
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{
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private:
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/// Extracts settings to enlight which are used (and avoid copy of others).
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struct ExtractedSettings
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{
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const bool use_index_for_in_with_subqueries;
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const SizeLimits size_limits_for_set;
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const UInt64 distributed_group_by_no_merge;
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explicit ExtractedSettings(const Settings & settings_);
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};
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public:
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/// Ctor for non-select queries. Generally its usage is:
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/// auto actions = ExpressionAnalyzer(query, syntax, context).getActions();
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ExpressionAnalyzer(const ASTPtr & query_, const TreeRewriterResultPtr & syntax_analyzer_result_, ContextPtr context_)
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: ExpressionAnalyzer(query_, syntax_analyzer_result_, context_, 0, false, {}, {})
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{
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}
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~ExpressionAnalyzer();
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void appendExpression(ExpressionActionsChain & chain, const ASTPtr & expr, bool only_types);
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/// If `ast` is not a SELECT query, just gets all the actions to evaluate the expression.
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/// If add_aliases, only the calculated values in the desired order and add aliases.
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/// If also project_result, than only aliases remain in the output block.
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/// Otherwise, only temporary columns will be deleted from the block.
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ActionsDAGPtr getActionsDAG(bool add_aliases, bool project_result = true);
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ExpressionActionsPtr getActions(bool add_aliases, bool project_result = true, CompileExpressions compile_expressions = CompileExpressions::no);
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/// Actions that can be performed on an empty block: adding constants and applying functions that depend only on constants.
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/// Does not execute subqueries.
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ExpressionActionsPtr getConstActions(const ColumnsWithTypeAndName & constant_inputs = {});
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/** Sets that require a subquery to be create.
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* Only the sets needed to perform actions returned from already executed `append*` or `getActions`.
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* That is, you need to call getSetsWithSubqueries after all calls of `append*` or `getActions`
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* and create all the returned sets before performing the actions.
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*/
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SubqueriesForSets & getSubqueriesForSets() { return subqueries_for_sets; }
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PreparedSets & getPreparedSets() { return prepared_sets; }
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/// Get intermediates for tests
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const ExpressionAnalyzerData & getAnalyzedData() const { return *this; }
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/// A list of windows for window functions.
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const WindowDescriptions & windowDescriptions() const { return window_descriptions; }
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void makeWindowDescriptions(ActionsDAGPtr actions);
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/**
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* Create Set from a subquery or a table expression in the query. The created set is suitable for using the index.
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* The set will not be created if its size hits the limit.
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*/
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void tryMakeSetForIndexFromSubquery(const ASTPtr & subquery_or_table_name, const SelectQueryOptions & query_options = {});
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/**
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* Checks if subquery is not a plain StorageSet.
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* Because while making set we will read data from StorageSet which is not allowed.
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* Returns valid SetPtr from StorageSet if the latter is used after IN or nullptr otherwise.
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*/
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SetPtr isPlainStorageSetInSubquery(const ASTPtr & subquery_or_table_name);
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protected:
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ExpressionAnalyzer(
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const ASTPtr & query_,
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const TreeRewriterResultPtr & syntax_analyzer_result_,
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ContextPtr context_,
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size_t subquery_depth_,
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bool do_global_,
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SubqueriesForSets subqueries_for_sets_,
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PreparedSets prepared_sets_);
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ASTPtr query;
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const ExtractedSettings settings;
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size_t subquery_depth;
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TreeRewriterResultPtr syntax;
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const ConstStoragePtr & storage() const { return syntax->storage; } /// The main table in FROM clause, if exists.
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const TableJoin & analyzedJoin() const { return *syntax->analyzed_join; }
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const NamesAndTypesList & sourceColumns() const { return syntax->required_source_columns; }
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const std::vector<const ASTFunction *> & aggregates() const { return syntax->aggregates; }
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/// Find global subqueries in the GLOBAL IN/JOIN sections. Fills in external_tables.
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void initGlobalSubqueriesAndExternalTables(bool do_global);
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ArrayJoinActionPtr addMultipleArrayJoinAction(ActionsDAGPtr & actions, bool is_left) const;
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void getRootActions(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts = false);
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/** Similar to getRootActions but do not make sets when analyzing IN functions. It's used in
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* analyzeAggregation which happens earlier than analyzing PREWHERE and WHERE. If we did, the
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* prepared sets would not be applicable for MergeTree index optimization.
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*/
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void getRootActionsNoMakeSet(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts = false);
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void getRootActionsForHaving(const ASTPtr & ast, bool no_subqueries, ActionsDAGPtr & actions, bool only_consts = false);
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/** Add aggregation keys to aggregation_keys, aggregate functions to aggregate_descriptions,
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* Create a set of columns aggregated_columns resulting after the aggregation, if any,
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* or after all the actions that are normally performed before aggregation.
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* Set has_aggregation = true if there is GROUP BY or at least one aggregate function.
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*/
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void analyzeAggregation(ActionsDAGPtr & temp_actions);
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void makeAggregateDescriptions(ActionsDAGPtr & actions, AggregateDescriptions & descriptions);
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const ASTSelectQuery * getSelectQuery() const;
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bool isRemoteStorage() const { return syntax->is_remote_storage; }
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NamesAndTypesList getColumnsAfterArrayJoin(ActionsDAGPtr & actions, const NamesAndTypesList & src_columns);
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NamesAndTypesList analyzeJoin(ActionsDAGPtr & actions, const NamesAndTypesList & src_columns);
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};
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class SelectQueryExpressionAnalyzer;
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/// Result of SelectQueryExpressionAnalyzer: expressions for InterpreterSelectQuery
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struct ExpressionAnalysisResult
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{
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std::string dump() const;
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/// Do I need to perform the first part of the pipeline - running on remote servers during distributed processing.
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bool first_stage = false;
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/// Do I need to execute the second part of the pipeline - running on the initiating server during distributed processing.
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bool second_stage = false;
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bool need_aggregate = false;
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bool has_order_by = false;
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bool has_window = false;
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String where_column_name;
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bool remove_where_filter = false;
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bool optimize_read_in_order = false;
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bool optimize_aggregation_in_order = false;
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bool join_has_delayed_stream = false;
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ActionsDAGPtr before_array_join;
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ArrayJoinActionPtr array_join;
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ActionsDAGPtr before_join;
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ActionsDAGPtr converting_join_columns;
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JoinPtr join;
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ActionsDAGPtr before_where;
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ActionsDAGPtr before_aggregation;
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ActionsDAGPtr before_having;
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String having_column_name;
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bool remove_having_filter = false;
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ActionsDAGPtr before_window;
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ActionsDAGPtr before_order_by;
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ActionsDAGPtr before_limit_by;
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ActionsDAGPtr final_projection;
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/// Columns from the SELECT list, before renaming them to aliases. Used to
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/// perform SELECT DISTINCT.
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Names selected_columns;
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/// Columns to read from storage if any.
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Names required_columns;
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/// Columns will be removed after prewhere actions execution.
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NameSet columns_to_remove_after_prewhere;
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PrewhereInfoPtr prewhere_info;
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FilterDAGInfoPtr filter_info;
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ConstantFilterDescription prewhere_constant_filter_description;
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ConstantFilterDescription where_constant_filter_description;
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/// Actions by every element of ORDER BY
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ManyExpressionActions order_by_elements_actions;
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ManyExpressionActions group_by_elements_actions;
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ExpressionAnalysisResult() = default;
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ExpressionAnalysisResult(
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SelectQueryExpressionAnalyzer & query_analyzer,
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const StorageMetadataPtr & metadata_snapshot,
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bool first_stage,
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bool second_stage,
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bool only_types,
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const FilterDAGInfoPtr & filter_info,
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const Block & source_header);
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/// Filter for row-level security.
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bool hasFilter() const { return filter_info.get(); }
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bool hasJoin() const { return join.get(); }
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bool hasPrewhere() const { return prewhere_info.get(); }
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bool hasWhere() const { return before_where.get(); }
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bool hasHaving() const { return before_having.get(); }
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bool hasLimitBy() const { return before_limit_by.get(); }
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void removeExtraColumns() const;
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void checkActions() const;
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void finalize(
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const ExpressionActionsChain & chain,
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ssize_t & prewhere_step_num,
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ssize_t & where_step_num,
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ssize_t & having_step_num,
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const ASTSelectQuery & query);
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};
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/// SelectQuery specific ExpressionAnalyzer part.
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class SelectQueryExpressionAnalyzer : public ExpressionAnalyzer
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{
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public:
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friend struct ExpressionAnalysisResult;
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SelectQueryExpressionAnalyzer(
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const ASTPtr & query_,
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const TreeRewriterResultPtr & syntax_analyzer_result_,
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ContextPtr context_,
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const StorageMetadataPtr & metadata_snapshot_,
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const NameSet & required_result_columns_ = {},
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bool do_global_ = false,
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const SelectQueryOptions & options_ = {},
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SubqueriesForSets subqueries_for_sets_ = {},
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PreparedSets prepared_sets_ = {})
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: ExpressionAnalyzer(
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query_,
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syntax_analyzer_result_,
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context_,
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options_.subquery_depth,
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do_global_,
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std::move(subqueries_for_sets_),
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std::move(prepared_sets_))
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, metadata_snapshot(metadata_snapshot_)
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, required_result_columns(required_result_columns_)
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, query_options(options_)
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{
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}
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/// Does the expression have aggregate functions or a GROUP BY or HAVING section.
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bool hasAggregation() const { return has_aggregation; }
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bool hasWindow() const { return !syntax->window_function_asts.empty(); }
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bool hasGlobalSubqueries() { return has_global_subqueries; }
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bool hasTableJoin() const { return syntax->ast_join; }
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const NamesAndTypesList & aggregationKeys() const { return aggregation_keys; }
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bool hasConstAggregationKeys() const { return has_const_aggregation_keys; }
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const AggregateDescriptions & aggregates() const { return aggregate_descriptions; }
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const PreparedSets & getPreparedSets() const { return prepared_sets; }
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std::unique_ptr<QueryPlan> getJoinedPlan();
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/// Tables that will need to be sent to remote servers for distributed query processing.
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const TemporaryTablesMapping & getExternalTables() const { return external_tables; }
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ActionsDAGPtr simpleSelectActions();
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/// These appends are public only for tests
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void appendSelect(ExpressionActionsChain & chain, bool only_types);
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/// Deletes all columns except mentioned by SELECT, arranges the remaining columns and renames them to aliases.
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ActionsDAGPtr appendProjectResult(ExpressionActionsChain & chain) const;
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/// Create Set-s that we make from IN section to use index on them.
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void makeSetsForIndex(const ASTPtr & node);
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private:
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StorageMetadataPtr metadata_snapshot;
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/// If non-empty, ignore all expressions not from this list.
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NameSet required_result_columns;
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SelectQueryOptions query_options;
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JoinPtr makeTableJoin(
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const ASTTablesInSelectQueryElement & join_element,
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const ColumnsWithTypeAndName & left_columns,
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ActionsDAGPtr & left_convert_actions);
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const ASTSelectQuery * getAggregatingQuery() const;
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/** These methods allow you to build a chain of transformations over a block, that receives values in the desired sections of the query.
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*
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* Example usage:
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* ExpressionActionsChain chain;
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* analyzer.appendWhere(chain);
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* chain.addStep();
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* analyzer.appendSelect(chain);
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* analyzer.appendOrderBy(chain);
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* chain.finalize();
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*
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* If only_types = true set, does not execute subqueries in the relevant parts of the query. The actions got this way
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* shouldn't be executed, they are only needed to get a list of columns with their types.
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*/
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/// Before aggregation:
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ArrayJoinActionPtr appendArrayJoin(ExpressionActionsChain & chain, ActionsDAGPtr & before_array_join, bool only_types);
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bool appendJoinLeftKeys(ExpressionActionsChain & chain, bool only_types);
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JoinPtr appendJoin(ExpressionActionsChain & chain, ActionsDAGPtr & converting_join_columns);
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/// remove_filter is set in ExpressionActionsChain::finalize();
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/// Columns in `additional_required_columns` will not be removed (they can be used for e.g. sampling or FINAL modifier).
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ActionsDAGPtr appendPrewhere(ExpressionActionsChain & chain, bool only_types, const Names & additional_required_columns);
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bool appendWhere(ExpressionActionsChain & chain, bool only_types);
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bool appendGroupBy(ExpressionActionsChain & chain, bool only_types, bool optimize_aggregation_in_order, ManyExpressionActions &);
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void appendAggregateFunctionsArguments(ExpressionActionsChain & chain, bool only_types);
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void appendWindowFunctionsArguments(ExpressionActionsChain & chain, bool only_types);
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/// After aggregation:
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bool appendHaving(ExpressionActionsChain & chain, bool only_types);
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/// appendSelect
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ActionsDAGPtr appendOrderBy(ExpressionActionsChain & chain, bool only_types, bool optimize_read_in_order, ManyExpressionActions &);
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bool appendLimitBy(ExpressionActionsChain & chain, bool only_types);
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/// appendProjectResult
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};
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}
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