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https://github.com/ClickHouse/ClickHouse.git
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495c6e03aa
* Replace all Context references with std::weak_ptr * Fix shared context captured by value * Fix build * Fix Context with named sessions * Fix copy context * Fix gcc build * Merge with master and fix build * Fix gcc-9 build
32 lines
905 B
C++
32 lines
905 B
C++
#pragma once
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#include <Interpreters/Aliases.h>
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#include <Interpreters/Context_fwd.h>
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#include <Interpreters/DatabaseAndTableWithAlias.h>
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#include <Parsers/IAST_fwd.h>
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namespace DB
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{
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struct StorageInMemoryMetadata;
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using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
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/// Part of of Tree Rewriter (SyntaxAnalyzer) that optimizes AST.
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/// Query should be ready to execute either before either after it. But resulting query could be faster.
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class TreeOptimizer
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{
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public:
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static void apply(
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ASTPtr & query,
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Aliases & aliases,
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const NameSet & source_columns_set,
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const std::vector<TableWithColumnNamesAndTypes> & tables_with_columns,
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ContextPtr context,
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const StorageMetadataPtr & metadata_snapshot,
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bool & rewrite_subqueries);
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static void optimizeIf(ASTPtr & query, Aliases & aliases, bool if_chain_to_multiif);
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};
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}
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