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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Todd A. Cook <tcook@blackducksoftware.com>
Cc: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: PostgreSQL Bugs <pgsql-bugs@postgresql.org>
Subject: Re: BUG #14932: SELECT DISTINCT val FROM table gets stuck in an infinite loop
Date: Fri, 26 Jan 2018 18:48:35 -0500
Message-ID: <14184.1517010515@sss.pgh.pa.us> (raw)
In-Reply-To: <20180126234537.dyu6jwnqz7snpq7n@alap3.anarazel.de>
References: <CAEepm=3SC9zYLKhvtZbsnwf9vEpi96WCGz1rdGLofuzBau=fqA@mail.gmail.com>
	<17357.1511841783@sss.pgh.pa.us>
	<9cd29b81-7ba1-91a2-f491-9014f4ac87e6@blackducksoftware.com>
	<2a76784c-06cb-46ec-35be-9895d144b839@2ndquadrant.com>
	<219b37b2-d740-d04a-203a-49ae422028f7@blackducksoftware.com>
	<c15378b3-d4aa-a5c0-5538-dd52904dcbc6@2ndquadrant.com>
	<1773c302-2fb1-749f-8ccc-62b23617c5ac@blackducksoftware.com>
	<25629.1512580464@sss.pgh.pa.us>
	<20171206171923.dg7phzfh7nb4lou3@alap3.anarazel.de>
	<7de4b2d6-b119-7d15-04d8-4c0fcb29cbc3@2ndquadrant.com>
	<20180126234537.dyu6jwnqz7snpq7n@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> On 2017-12-10 23:09:42 +0100, Tomas Vondra wrote:
>> FWIW I do agree the data sets shared in this thread are pretty extreme
>> and it doesn't make much sense to slow the regular cases. I'll be
>> perfectly happy if we stop the OOM, making those cases fast is a bonus.

> Yea, agreed on that. I'm kinda inclined to go for stop-growing in 10,
> and so something better in 11. And then later possibly backpatch if
> we've grown some confidence?

+1.  I'd like to see some response to this included in 10.2, and time
grows short for that.

			regards, tom lane




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