Re: performance regression with 9.2

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Dave Cramer <pg(at)fastcrypt(dot)com>
Cc: pgsql-performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: performance regression with 9.2
Date: 2012-11-12 20:43:53
Message-ID: 5518.1352753033@sss.pgh.pa.us
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Dave Cramer <pg(at)fastcrypt(dot)com> writes:
> This query is a couple orders of magnitude slower the first result is
> 9.2.1, the second 9.1

Hm, the planner's evidently doing the wrong thing inside the recursive
union, but not obvious why. Can you extract a self-contained test case?

regards, tom lane

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