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* Index + mismatching datatypes [WAS: index on custom function; explain]
@ 2005-11-07 18:07 Enrico Weigelt <weigelt@metux.de>
2005-11-07 20:45 ` Re: Index + mismatching datatypes [WAS: index on custom Neil Conway <neilc@samurai.com>
0 siblings, 1 reply; 2+ messages in thread
From: Enrico Weigelt @ 2005-11-07 18:07 UTC (permalink / raw)
To: pgsql-performance
* Yann Michel <yann-postgresql@spline.de> wrote:
> TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
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.
What am I doing wrong ?
cu
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^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Index + mismatching datatypes [WAS: index on custom
2005-11-07 18:07 Index + mismatching datatypes [WAS: index on custom function; explain] Enrico Weigelt <weigelt@metux.de>
@ 2005-11-07 20:45 ` Neil Conway <neilc@samurai.com>
0 siblings, 0 replies; 2+ messages in thread
From: Neil Conway @ 2005-11-07 20:45 UTC (permalink / raw)
To: weigelt@metux.de; +Cc: pgsql-performance
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
^ permalink raw reply [nested|flat] 2+ messages in thread
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2005-11-07 18:07 Index + mismatching datatypes [WAS: index on custom function; explain] Enrico Weigelt <weigelt@metux.de>
2005-11-07 20:45 ` Re: Index + mismatching datatypes [WAS: index on custom Neil Conway <neilc@samurai.com>
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