Re: Multivariate MCV list vs. statistics target

Hi,

On Wed, Mar 18, 2020 at 04:28:34AM +0000, Shinoda, Noriyoshi (PN Japan A&PS Delivery) wrote:
>Hello,
>
>I found a missing column description in the pg_statistic_ext catalog document for this new feature.
>The attached patch adds a description of the 'stxstattarget' column to pg_statistic_ext catalog's document.
>If there is a better explanation, please correct it.
>

Thanks for the report. Yes, this is clearly an omission. I think it
would be better to use wording similar to attstattarget, per the
attached patch. That is, without reference to ALTER STATISTICS and
better explaination of what positive/negative values do. Do you agree?

regards

>Regards,
>Noriyoshi Shinoda
>
>-----Original Message-----
>From: Tomas Vondra [mailto:tomas(dot)vondra(at)2ndquadrant(dot)com]
>Sent: Wednesday, September 11, 2019 7:28 AM
>To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
>Cc: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>; Jamison, Kirk <k(dot)jamison(at)jp(dot)fujitsu(dot)com>; Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>; PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
>Subject: Re: Multivariate MCV list vs. statistics target
>
>On Tue, Sep 03, 2019 at 02:38:56PM -0400, Alvaro Herrera wrote:
>>On 2019-Aug-01, Tomas Vondra wrote:
>>
>>> I'll move it to the next CF. Aside from the issues pointed by
>>> Kyotaro-san in his review, I still haven't made my mind about whether
>>> to base the use statistics targets set for the attributes. That's
>>> what we're doing now, but I'm not sure it's a good idea after adding separate statistics target.
>>> I wonder what Dean's opinion on this is, as he added the current logic.
>>
>>Latest patch no longer applies. Please update. And since you already
>>seem to have handled all review comments since it was Ready for
>>Committer, and you now know Dean's opinion on the remaining question,
>>please get it pushed.
>>
>
>OK, I've pushed this the patch, after some minor polishing.
>
>
>regards
>
>--
>Tomas Vondra http://www.2ndQuadrant.com
>PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
>
>
>

--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services