Re: [HACKERS] PATCH: multivariate histograms and MCV lists

On 7 April 2018 at 15:12, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Uh, where are we on this patch? It isn't going to make it into PG 11?
> Feature development for this has been going on for years.

Unfortunately, I think there's no way that this will be ready for
PG11. So far, I have only read parts of the patch, focusing mainly on
the planner changes, and how it will make use of the new statistics. I
think there are still issues to work out in that area, although I
haven't read the latest version yet, I have some doubts about the new
approach described.

Looking back at the history of this patch, it appears to have moved
through all 4 PG11 commitfests with fairly minimal review, never
becoming Ready for Committer. That's a real shame because I agree that
it's an important feature, but IMO it's not yet in a committable
state. I feel bad saying that, because the patch hasn't really had a
fair chance to-date, despite Tomas' efforts and quick responses to all
review comments.

At this stage though, all I can say is that I'll make every effort to
keep reviewing it, and I hope Tomas will persist, so that it has a
better chance in PG12.

Regards,
Dean