Re: Using 128-bit integers for sum, avg and statistics aggregates

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andreas Karlsson <andreas(at)proxel(dot)se>, Peter Geoghegan <pg(at)heroku(dot)com>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Using 128-bit integers for sum, avg and statistics aggregates
Date: 2015-03-22 09:35:34
Message-ID: 50949B74-A45E-4D00-A4D2-373CD88B5E29@2ndquadrant.com
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On March 22, 2015 10:34:04 AM GMT+01:00, Michael Paquier <michael(dot)paquier(at)gmail(dot)com> wrote:
>On Sun, Mar 22, 2015 at 6:22 PM, Andres Freund <andres(at)2ndquadrant(dot)com>
>wrote:
>> On March 22, 2015 6:17:28 AM GMT+01:00, Michael Paquier
><michael(dot)paquier(at)gmail(dot)com> wrote:
>>>On Sun, Mar 22, 2015 at 12:32 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>>> Andres Freund <andres(at)2ndquadrant(dot)com> writes:
>>>>> Pushed with that additional change. Let's see if the buildfarm
>>>thinks.
>>>>
>>>> jacana, apparently alone among buildfarm members, does not like it.
>>>
>>>All the windows nodes don't pass tests with this patch, the
>difference
>>>is in the exponential precision: e+000 instead of e+00.
>>
>> That's due to a different patch though, right? When I checked earlier
>only jacana had problems due to this, and it looked like random memory
>was being output. It's interesting that that's on the one windows (not
>cygwin) critter that does the 128bit dance...
>
>Yes, sorry, the e+000 stuff is from 959277a. This patch has visibly
>broken that:
>http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=jacana&dt=2015-03-21%2003%3A01%3A21

That's the stuff looking like random memory that I talk about above...

--
Please excuse brevity and formatting - I am writing this on my mobile phone.

Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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