| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Christian Schröder <cs(at)deriva(dot)de>, pgsql-hackers(at)postgreSQL(dot)org |
| Subject: | Re: [GENERAL] Performance of full outer join in 8.3 |
| Date: | 2009-04-15 21:55:13 |
| Message-ID: | 1239832513.23905.82.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-general pgsql-hackers |
On Wed, 2009-04-15 at 12:34 -0400, Tom Lane wrote:
> On further review, this did work in 8.3 when released. I think it got
> broken here:
>
> http://archives.postgresql.org/pgsql-committers/2008-06/msg00336.php
>
> because that change is preventing the "mergedvar = constant" clause from
> being seen as an equivalence, when it should be seen as one. Need to
> think about a tighter fix for the bug report that prompted that change.
I've always been scared to ask this question, in case the answer is No,
but: Do we have a set of regression tests for the optimizer anywhere?
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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