BUG #1187: Problem in SQL Functions on Composite Types

The following bug has been logged online:

Bug reference: 1187
Logged by: Eduard Pinchuck

Email address: edwardo(at)softprofi(dot)com

PostgreSQL version: 7.5 Dev

Operating system: FreeBSD 5.1

Description: Problem in SQL Functions on Composite Types

Details:

Hello. PostgreSQL 7.4.2.
I have a problem with such sql function...

CREATE SCHEMA "common_references" AUTHORIZATION "ed";

CREATE TABLE "common_references"."zip_codes" (
"id_zip_code" SERIAL,
"city_name" CHAR(30) NOT NULL,
"region_name" CHAR(30),
"country_name" CHAR(30) NOT NULL,
"zip_code" TEXT NOT NULL,
"district_name" TEXT,
CONSTRAINT "zip_codes_id_zip_code_key" UNIQUE("id_zip_code")
) WITH OIDS;

I had inserted some records...

/* !!!!!!!!!! FUNCTION !!!!!!! */

CREATE OR REPLACE FUNCTION "common_references"."get_zc_el" (integer) RETURNS
SETOF "common_references"."zip_codes" AS'
select * from common_references.zip_codes a
where a.id_zip_code = $1;
'LANGUAGE 'sql' VOLATILE RETURNS NULL ON NULL INPUT SECURITY INVOKER;

/* Expression */

select * from common_references.get_zc_el(1::integer);

/* had returned */

ERROR: query-specified return row and actual function return row do not
match

What is wrong?