Re: Statistics Import and Export: difference in statistics dumped

From: Jeff Davis <pgsql(at)j-davis(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Michael Paquier <michael(at)paquier(dot)xyz>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Stephen Frost <sfrost(at)snowman(dot)net>, Peter Smith <smithpb2250(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, jian he <jian(dot)universality(at)gmail(dot)com>
Subject: Re: Statistics Import and Export: difference in statistics dumped
Date: 2025-03-10 23:53:50
Message-ID: 9a9090634e24b19ae1eff8a275f2db84f261c58f.camel@j-davis.com
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On Mon, 2025-03-10 at 17:53 -0400, Tom Lane wrote:
> I wrote:
> > I think what is happening is that the patch shut off CREATE
> > INDEX's update of not only the table's stats but also the
> > index's stats.  This seems unhelpful: the index's empty
> > stats can never be what's wanted.
>
> I looked at this more closely and realized that it's a simple matter
> of having made the tests in the wrong order.  The whole stanza
> should only apply when dealing with the table, not the index.
>
> I verified that this change fixes the cross-version-upgrade
> failure in local testing, and pushed it.

Ah, thank you.

Regards,
Jeff Davis

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