1 | #pragma once |
2 | |
3 | #include <DataTypes/IDataType.h> |
4 | |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | /** Get data type that covers intersection of all possible values of passed data types. |
10 | * DataTypeNothing is the most common subtype for all types. |
11 | * Examples: most common subtype for UInt16, UInt8 and Int8 - UInt16. |
12 | * Examples: most common subtype for Array(UInt8), Int8 is Nothing |
13 | * |
14 | * If force_support_conversion is true, returns type which may be used to convert each argument to. |
15 | * Example: most common subtype for Array(UInt8) and Array(Nullable(Int32)) is Array(Nullable(UInt8) if force_support_conversion is true. |
16 | */ |
17 | DataTypePtr getMostSubtype(const DataTypes & types, bool throw_if_result_is_nothing = false, bool force_support_conversion = false); |
18 | |
19 | } |
20 | |