Re: [ADMIN] Overloading functions that are used by operators.

"Dave Page" <dpage(at)vale-housing(dot)co(dot)uk> writes:
>> I see no such error here ...
>>
>> regression=# create function pg_catalog.textcat(varchar,text)
>> regression-# returns text as 'textcat' language 'internal';
>> CREATE FUNCTION

> Andreas (Pflug) reckons it's gone in 7.4, but in 7.3.2 I see:
> [ complicated query ]

Oh. I'll bet you're running into the regproc-reverse-conversion
problem. 'textcat' is one of the histogram values appearing in pg_stats
for pg_operator.oprcode, right? The error comes when the planner tries
to convert that string back to OID form. We fixed this in 7.4 by
modifying the way that pg_statistic stores data values, so that no
conversion needs to occur.

regards, tom lane