`information_schema.routines.is_user_defined_cast`

mysql

type: YES_OR_NO NULL

Note:

Applies to a feature not available in PostgreSQL

10-15

type: CHARACTER_DATA

Note:

Applies to a feature not available in PostgreSQL

7.4-9.6

type: NULL

Note:

Always NULL.

type: NVARCHAR(10) NULL

Note:

Returns YES if user-defined cast function, and NO if not a user-defined cast function. Always returns NO.