Re: First draft of PG 19 release notes

Hi,

On 2026-04-19 09:32:45 -0400, Bruce Momjian wrote:
> On Sun, Apr 19, 2026 at 01:27:10PM +0200, David Geier wrote:
> > >>> So, it seems there is no user-visible change, except it is faster. Does
> > >>> it enable new workloads? A 3x speedup probably does. Should this be a
> > >>> pg_trgm item, with a description mentioning GIN in general, or should it
> > >>> be a GIN item, perhaps mentioning pg_trgm? Do you have any suggested
> > >>> text and list of commits?
> > >>
> > >> Not all patches from the initial mail have been committed yet. Hence,
> > >> currently the speed up is less. However, once they got all committed
> > >> they would indeed open up new "use cases". For example, I know users
> > >> that don't add GIN indexes to very large tables because creating them
> > >> takes too long.
> > >
> > > Yes, GIN index creation has always been considered slow, so it is good
> > > it is being worked on. I wonder if we should just wait for it all to be
> > > committed before adding it to the release notes, unless you want to
> > > measure the improvement we have in PG 19.
> >
> > I've measured with the same benchmark I used in the original thread [1].
> > With latest master the results are as follows:
> >
> > Dataset | REL_18_3 | master | Speedup
> > ---------|------------|------------|--------
> > movies | 10,561 ms | 9,124 ms | 1.17x
> > lineitem | 263,523 ms | 234,605 ms | 1.12x
> >
> > That's because three patches from the patchset haven't been committed
> > yet. Two of the three patches are the most impactful from the patchset.
>
> Okay, at +12-17%, so we should wait until all the patches are in to
> mention this. Thanks.

That makes no sense to me. It's a material improvement that could convince
people to upgrade. Why would you not want to mention that, just because PG 20
might have further improvements? There *always* will be further potential
improvements.

Greetings,

Andres Freund