PostgreSQL - Necesito Ayuda URGENTE por favor .. para que procedimiento me envie datos dinamicos

CREATE OR REPLACE FUNCTION domo_getlookupdata(pstrtabla character varying, pstrcampolookup character varying, pintidregistro character varying)
RETURNS SETOF getlookupdata AS
$BODY$
DECLARE
res getlookupdata%rowtype;
pintIdRegistro VARCHAR(100) = 0;
vsql VARCHAR(4000);

BEGIN

IF pintIdRegistro <> 0 then
vsql := 'SELECT id_' || pstrTabla || ' , '
|| pstrCampoLookup || ' FROM ' || pstrTabla
|| ' WHERE id_'||pstrTabla||' = ' || pintIdRegistro :: VARCHAR(30)
|| ' ORDER BY ' || pstrCampoLookup || ' ';



ELSE
vsql := 'SELECT id_' || pstrTabla || ' , '
|| pstrCampoLookup || ' FROM ' || pstrTabla
|| ' ORDER BY ' || pstrCampoLookup || ' ';

END IF;
FOR res IN
execute vsql
LOOP
RETURN NEXT res;
END LOOP;
RETURN;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION domo_getlookupdata(character varying, character varying, character varying) OWNER TO sa;