Function interpret_func_support

src/backend/commands/functioncmds.c:873–910

}

static Oid
interpret_func_support(DefElem *defel)
{
	List	   *procName = defGetQualifiedName(defel);
	Oid			procOid;
	Oid			argList[1];

	/*
	 * Support functions always take one INTERNAL argument and return
	 * INTERNAL.
	 */
	argList[0] = INTERNALOID;

	procOid = LookupFuncName(procName, 1, argList, true);
	if (!OidIsValid(procOid))
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_FUNCTION),
				 errmsg("function %s does not exist",
						func_signature_string(procName, 1, NIL, argList))));

	if (get_func_rettype(procOid) != INTERNALOID)
		ereport(ERROR,
				(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
				 errmsg("support function %s must return type %s",
						NameListToString(procName), "internal")));

	/*
	 * Someday we might want an ACL check here; but for now, we insist that
	 * you be superuser to specify a support function, so privilege on the
	 * support function is moot.
	 */
	if (!superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser to specify a support function")));

	return procOid;
}


/*