Hola Matías,
ejecutá este script:
CREATE OR REPLACE FUNCTION pg_catalog.varchartoint(character varying) RETURNS integer
STRICT IMMUTABLE LANGUAGE SQL AS ‘SELECT
int4($1::text);’;
CREATE CAST (character varying AS integer) WITH FUNCTION
pg_catalog.varchartoint(character varying) AS IMPLICIT;
se publicó en el tema del foro : http://foro.comunidad.siu.edu.ar/index.php?topic=2088.0
saludos,
Eugenia