Re: Performance of full outer join in 8.3 - Mailing list pgsql-general

From Tom Lane
Subject Re: Performance of full outer join in 8.3
Date
Msg-id 11212.1239809581@sss.pgh.pa.us
Whole thread Raw
In response to Performance of full outer join in 8.3  (Christian Schröder <cs@deriva.de>)
Responses Re: Performance of full outer join in 8.3
List pgsql-general
=?ISO-8859-1?Q?Christian_Schr=F6der?= <cs@deriva.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 ...

            regards, tom lane

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