[Re-sending to hackers, since the original message to pgsql-bugs has
not been approved for delivery in the last four days…apologies for any
duplicates.]
Howdy,
I ran into this error on 8.2 a while ago, and just figured out what
was causing it. Here's a quick example on 8.2:
BEGIN;
-- Compare name[]s more or less like 8.3 does.
CREATE OR REPLACE FUNCTION namearray_text(name[])
RETURNS TEXT AS 'SELECT textin(array_out($1));'
LANGUAGE sql IMMUTABLE STRICT;
CREATE CAST (name[] AS text) WITH FUNCTION namearray_text(name[]) AS
IMPLICIT;
CREATE OR REPLACE FUNCTION namearray_eq( name[], name[] )
RETURNS bool
AS 'SELECT $1::text = $2::text;'
LANGUAGE sql IMMUTABLE STRICT;
CREATE OPERATOR = ( LEFTARG = name[], RIGHTARG = name[], NEGATOR = <>, PROCEDURE = namearray_eq
);
SELECT '{foo}'::name[] <> '{bar}'::name[];
ROLLBACK;
If you comment out the NEGATOR line, the error is changed to the more
useful
ERROR: operator is not unique: name[] <> name[]
I'm assuming that, if you did this for 8.3 (which has name[]
comparison operators in core, so it'd have to be an operator with some
other type), you'd get the same useless error.
Ideally, in the situation where a NEGATOR (or commutator, too?) is
specified but has not actually been defined, you'd get an error such as:
ERROR: operator not defined: name[] <> name[]
Thanks,
David