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getMostSubtype.h
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19 lines (14 loc) · 739 Bytes
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#pragma once
#include <DataTypes/IDataType.h>
namespace DB
{
/** Get data type that covers intersection of all possible values of passed data types.
* DataTypeNothing is the most common subtype for all types.
* Examples: most common subtype for UInt16, UInt8 and Int8 - UInt16.
* Examples: most common subtype for Array(UInt8), Int8 is Nothing
*
* If force_support_conversion is true, returns type which may be used to convert each argument to.
* Example: most common subtype for Array(UInt8) and Array(Nullable(Int32)) is Array(Nullable(UInt8) if force_support_conversion is true.
*/
DataTypePtr getMostSubtype(const DataTypes & types, bool throw_if_result_is_nothing = false, bool force_support_conversion = false);
}