| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Christian Schröder <cs(at)deriva(dot)de> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Performance of full outer join in 8.3 |
| Date: | 2009-04-16 20:48:23 |
| Message-ID: | 4827.1239914903@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers |
I wrote:
> =?ISO-8859-1?Q?Christian_Schr=F6der?= <cs(at)deriva(dot)de> writes:
>> This is the query:
>> select isin from ts_frontend.attachment_isins full OUTER JOIN
>> ts_frontend.rec_isins using (attachment,isin) WHERE attachment=2698120
>> GROUP BY isin limit 1000;
> Hmm. It seems 8.3 is failing to push the attachment=2698120 condition
> down to the input relations. Not sure why. All that code got massively
> rewritten in 8.3, but I thought it still understood about pushing
> equalities through a full join ...
I've applied a patch for this. It will be in 8.3.8, or if you're
in a hurry you can grab it from our CVS server or here:
http://archives.postgresql.org/message-id/20090416204228.579317540E2@cvs.postgresql.org
regards, tom lane
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