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Re: Possible planner bug/regression introduced in 8.2.5

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jakub Ouhrabka <kuba(at)comgate(dot)cz>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: Possible planner bug/regression introduced in 8.2.5
Date: 2007-10-24 20:57:13
Message-ID: 13632.1193259433@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugs
Jakub Ouhrabka <kuba(at)comgate(dot)cz> writes:
> preparing the test case was easier than I expected. It's attached. Fast 
> planning on 8.2.4, very slow on 8.2.5.

Hmm.  I think there are two different bugs involved here.  One is fixed
by the attached patch, and it masks the performance problem on your test
case, but I wonder whether it will be enough for your real application.
Can you try this and see if it fixes 8.2.5 for you?

			regards, tom lane

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