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From: Andres Freund <andres@anarazel.de>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
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: Mon, 29 Jan 2018 09:06:31 -0800
Message-ID: <20180129170631.kdr2dtu5rodvovhv@alap3.anarazel.de> (raw)
In-Reply-To: <3971fa24-285b-1c57-db95-b15c513162c1@2ndquadrant.com>
References: <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>
	<14184.1517010515@sss.pgh.pa.us>
	<20180129010213.rt3nu73ilff756f6@alap3.anarazel.de>
	<3971fa24-285b-1c57-db95-b15c513162c1@2ndquadrant.com>

Hi,

On 2018-01-29 14:41:49 +0100, Tomas Vondra wrote:
> Do you think repeating the performance testing is necessary? Not sure
> when do you plan to push the changes, I may not have time for the tests
> until after FOSDEM.

Hm, it surely wouldn't hurt, but your previous result does give a lot of
confidence - there's not a lot of fundamental difference leaving one
more mitigation that should never reduce hashtable "quality" aside.  So
I think going ahead with pushing and then benchmarking if possible, is
reasonable?

Greetings,

Andres Freund




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