mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 11:32:03 +00:00
34 lines
921 B
C++
34 lines
921 B
C++
#pragma once
|
|
|
|
#include <memory>
|
|
#include <DB/Core/Field.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class IAST;
|
|
class Context;
|
|
|
|
/** Evaluate constant expression.
|
|
* Used in rare cases - for elements of set for IN, for data to INSERT.
|
|
* Quite suboptimal.
|
|
*/
|
|
Field evaluateConstantExpression(std::shared_ptr<IAST> & node, const Context & context);
|
|
|
|
|
|
/** Evaluate constant expression
|
|
* and returns ASTLiteral with its value.
|
|
*/
|
|
std::shared_ptr<IAST> evaluateConstantExpressionAsLiteral(std::shared_ptr<IAST> & node, const Context & context);
|
|
|
|
|
|
/** Evaluate constant expression
|
|
* and returns ASTLiteral with its value.
|
|
* Also, if AST is identifier, then return string literal with its name.
|
|
* Useful in places where some name may be specified as identifier, or as result of a constant expression.
|
|
*/
|
|
std::shared_ptr<IAST> evaluateConstantExpressionOrIdentidierAsLiteral(std::shared_ptr<IAST> & node, const Context & context);
|
|
|
|
}
|