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37 lines
980 B
C++
37 lines
980 B
C++
#pragma once
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#include <memory>
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#include <Core/Field.h>
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#include <Parsers/IAST.h>
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#include <Parsers/IParser.h>
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namespace DB
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{
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class Context;
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class IDataType;
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/** Evaluate constant expression and its type.
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* Used in rare cases - for elements of set for IN, for data to INSERT.
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* Quite suboptimal.
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*/
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std::pair<Field, std::shared_ptr<const IDataType>> evaluateConstantExpression(const ASTPtr & node, const Context & context);
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/** Evaluate constant expression
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* and returns ASTLiteral with its value.
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*/
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ASTPtr evaluateConstantExpressionAsLiteral(const ASTPtr & node, const Context & context);
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/** Evaluate constant expression
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* and returns ASTLiteral with its value.
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* Also, if AST is identifier, then return string literal with its name.
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* Useful in places where some name may be specified as identifier, or as result of a constant expression.
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*/
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ASTPtr evaluateConstantExpressionOrIdentifierAsLiteral(const ASTPtr & node, const Context & context);
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}
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