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32 lines
644 B
C++
32 lines
644 B
C++
#pragma once
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#include <DB/Parsers/IAST.h>
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#include <DB/Core/Block.h>
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namespace DB
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{
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class WriteBuffer;
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class Context;
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/** For SELECT query, determine names and types of columns of result,
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* and if some columns are constant expressions, calculate their values.
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*
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* NOTE It's possible to memoize calculations, that happens under the hood
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* and could be duplicated in subsequent analysis of subqueries.
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*/
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struct AnalyzeResultOfQuery
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{
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void process(ASTPtr & ast, Context & context);
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/// Block will have non-nullptr columns for constant expressions.
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Block result;
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/// Debug output
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void dump(WriteBuffer & out) const;
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};
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}
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