Drop Function if exists grcms_rating_isValidImageId
Create Function grcms_rating_isValidImageId(id bigint(20)) returns BOOL
BEGIN
	DECLARE id_exists BOOL;
	IF EXISTS (SELECT * FROM grcms_rating_images WHERE meta_id = id)
		SET id_exists = true;
	ELSE
		SET id_exists = false;
	END IF;
	RETURN(id_exists);
END