Name of function or table operator to map.
You must make sure that the function is present in the location you specify.
For functions or table operators stored within the database, if you do not specify a database or user, the location defaults to the following, in order of precedence:
- Current default database or user for the session
- Name of the database containing the function, if other than the current database for the session.
- Name of the user containing the function, if other than the current user for the session.
- Name of schema associated with function.