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Subject: Re: Index + mismatching datatypes [WAS: index on custom
From: Neil Conway <neilc@samurai.com>
To: weigelt@metux.de
Cc: pgsql-performance@postgresql.org
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Date: Mon, 07 Nov 2005 15:45:57 -0500
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On Mon, 2005-07-11 at 19:07 +0100, Enrico Weigelt wrote:
> I've got a similar problem: I have to match different datatypes,
> ie. bigint vs. integer vs. oid.
> 
> Of course I tried to use casted index (aka ON (foo::oid)), but 
> it didn't work.  

Don't include the cast in the index definition, include it in the query
itself:

    SELECT ... FROM foo WHERE int8col = 5::int8

for example. Alternatively, upgrade to 8.0 or better, which doesn't
require this workaround.

-Neil