| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: PG 18 release notes draft committed |
| Date: | 2025-05-23 21:03:53 |
| Message-ID: | aDDiuUv4Zk4IyFR2@momjian.us |
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| Lists: | pgsql-hackers |
On Fri, May 23, 2025 at 10:01:13AM -0400, Peter Geoghegan wrote:
> On Thu, May 22, 2025 at 10:24 PM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > I see your point that we are not defining what this does. I went with
> > the attached text.
>
> You propose the wording is "This allows muti-column btree indexes to
> be used by queries that only reference the second or later indexed
> columns".
>
> I think that your wording is a big improvement. I personally would
> have emphasized the absence of a "=" condition, rather than the
> presence of another condition on a later column, since there are cases
> where the first column is referenced but skip scan can still be used
> (e.g., when there one or more inequalities on the first column, plus a
> "=" condition on the second column). I can live with this wording,
> though.
I was able to squeeze in this detail in the attached, applied patch.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
Do not let urgent matters crowd out time for investment in the future.
| Attachment | Content-Type | Size |
|---|---|---|
| master.diff | text/x-diff | 544 bytes |
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