| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
| Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Release notes for February minor releases |
| Date: | 2022-02-04 21:29:19 |
| Message-ID: | 433898.1644010159@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> On Fri, Feb 04, 2022 at 02:58:59PM -0500, Tom Lane wrote:
>> Please send comments/corrections by Sunday.
[ assorted comments ]
Thanks for the corrections.
> + A previous bug fix disabled building of extended statistics for
> + old-style inheritance trees, but any existing statistics data was
> + not removed, and that data would become more and more out-of-date
> + over time. Adjust the planner to ignore such data. Extended
> + statistics for the individual child tables are still built and used,
> + however.
> The issue here isn't that old stats were never updated. For inheritance, they
> *were* updated with non-inherited stats (for SELECT FROM ONLY). But then
> "SELECT FROM tbl*" used the stats anyway...
I'm confused about this bit. Are we still building bogus stats for
inheritance parents, or has that stopped?
regards, tom lane
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