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From: Jay Levitt <jay.levitt@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Merlin Moncure <mmoncure@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Subquery in a JOIN not getting restricted?
Date: Thu, 10 Nov 2011 10:42:53 -0500
Message-ID: <4EBBF0FD.5050506@gmail.com> (raw)
In-Reply-To: <8071.1320938568@sss.pgh.pa.us>
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	<4EB80CAA0200002500042B3B@gw.wicourts.gov>
	<4EB86784.7080209@gmail.com>
	<4EB88C5A.2020704@gmail.com>
	<4EBA44B70200002500042BC8@gw.wicourts.gov>
	<CAHyXU0zWLRquK9xu4SbTrxyOTA2kbT1b3r4_H4KdEzE-hvVgoA@mail.gmail.com>
	<4EBA8C100200002500042C23@gw.wicourts.gov>
	<4EBBD717.80507@gmail.com>
	<8071.1320938568@sss.pgh.pa.us>

> Don't hold your breath waiting for that to change.  To do what you're
> wishing for, we'd have to treat the GROUP BY subquery as if it were an
> inner indexscan, and push a join condition into it.  That's not even
> possible today.

Thanks! Knowing "that's not a thing" helps; we'll just have to rephrase the 
query.

Jay



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