DO $$
BEGIN
  IF EXISTS(SELECT * FROM pg_settings WHERE name = 'server_version_num' AND setting::int >= 90600) THEN
    ALTER FUNCTION oracle.mod(SMALLINT, SMALLINT) PARALLEL SAFE;
    ALTER FUNCTION oracle.mod(INT, INT) PARALLEL SAFE;
    ALTER FUNCTION oracle.mod(BIGINT, BIGINT) PARALLEL SAFE;
    ALTER FUNCTION oracle.mod(NUMERIC, NUMERIC) PARALLEL SAFE;
  END IF;
END;
$$;