CREATE OR REPLACE FUNCTION sch."fn"(pArg1 CHARACTER VARYING DEFAULT 'main', pArg2 INTEGER DEFAULT 0)
  RETURNS SETOF sch."Tbl" AS
$BODY$
SELECT * FROM sch."Tbl" a WHERE a.arg1 = pArg1 AND a.arg2 > pArg;
$BODY$
  LANGUAGE SQL VOLATILE
  COST 100
  ROWS 1000;