Re: PG 18 release notes draft committed

On Wed, Sep 17, 2025 at 04:45:14PM -0400, Bruce Momjian wrote:
> On Wed, Sep 17, 2025 at 11:46:58AM -0400, Peter Geoghegan wrote:
> > I suggest the following alternative, which has the merit of being a
> > bit less verbose:
> > 
> > "Skip scan allows B-Tree index scans to find the most efficient way of
> > navigating through a multicolumn index when one or more of its columns
> > initially lacks a = condition and comes before a column that is
> > directly used by the query. Such an index scan can now be broken down
> > into multiple "index searches" by generating an implementation level =
> > condition on any underspecified columns. This allows the scan to skip
> > over irrelevant sections of the index, though only when the generated
> > = condition is on a column that has relatively few distinct values."
> > 
> > Note that "index searches" is a term that now appears in EXPLAIN ANALYZE output.
> 
> I went with this text, which is more "aspirational" rather than
> "proscriptive", and the right level of detail:
> 
>     This allows multi-column btree indexes to be used in more cases
>     such as when there are no restrictions on the first or early
>     indexed columns (or they are non-equality ones), and there are
>     useful restrictions on later indexed columns.

With our GA release dates close, I committed the attached patch.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Do not let urgent matters crowd out time for investment in the future.