CREATE OR REPLACE FUNCTION get_gallery(GalleryId INTEGER) RETURNS SETOF record AS
$$
DECLARE
    ft record;
BEGIN
    IF GalleryId = 0 THEN
        FOR ft IN
            SELECT * FROM Galleries WHERE isDefault=true LOOP
        RETURN NEXT ft;
        END LOOP;
        RETURN;
    ELSE
        FOR ft IN
            SELECT * FROM Galleries WHERE Id=$1 LOOP
        RETURN NEXT ft;
        END LOOP;
        RETURN;
    END IF;
END;
$$ LANGUAGE "plpgsql";


select * from get_gallery(0) as (id int, isdefault  bool);