ClickHouse/src/Interpreters/convertFieldToType.h
2020-04-03 18:14:31 +03:00

21 lines
651 B
C++

#pragma once
#include <Core/Field.h>
namespace DB
{
class IDataType;
/** Used to interpret expressions in a set in IN,
* and also in the query of the form INSERT ... VALUES ...
*
* To work correctly with expressions of the form `1.0 IN (1)` or, for example, `1 IN (1, 2.0, 2.5, -1)` work the same way as `1 IN (1, 2)`.
* Checks for the compatibility of types, checks values fall in the range of valid values of the type, makes type conversion.
* If the value does not fall into the range - returns Null.
*/
Field convertFieldToType(const Field & from_value, const IDataType & to_type, const IDataType * from_type_hint = nullptr);
}