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Re: Regression from 8.4 to 9.1.2/9.1.3: Optimizing filters on constants in unions

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Claus Stadler <cstadler(at)informatik(dot)uni-leipzig(dot)de>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: Regression from 8.4 to 9.1.2/9.1.3: Optimizing filters on constants in unions
Date: 2012-03-12 06:12:11
Message-ID: 29290.1331532731@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugs
Claus Stadler <cstadler(at)informatik(dot)uni-leipzig(dot)de> writes:
> Hi, not sure if this bug is already known, so sorry if it is ;)
> Filtering a Union on constant custom type:

This seems to be another unpleasant consequence of
http://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=57664ed25e5dea117158a2e663c29e60b3546e1c

I'm starting to think we need to revert that in favor of some other
solution, though I have no idea what yet.

			regards, tom lane

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