The following bug has been logged online:

Bug reference: 1900
Logged by: Alexander Kirpa
Email address: postgres (AT) bilteks (DOT) com
PostgreSQL version: 8.1beta2
Operating system: FreeBSD 5.2
Description: pgdumpall: false function description for type 'opaque'
Details:

During move from beta1 to beta2.
pgdumpall>x
psql template1 < x

ERROR: plpgsql functions cannot return type opaque

2005-09-20 08:38:04 EEST 93531 STATEMENT: CREATE FUNCTION uvcount(integer)
RETURNS opaque
AS $_$
BEGIN UPDATE classifier
SET vcount=get_vcount($1)
WHERE classifier.id= $1;
END
$_$
LANGUAGE plpgsql;

Best regards,
Alexander Kirpa

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