Re: Should total_pages be calculated after partition pruning and constraint exclusion?

David Rowley <david.rowley@2ndquadrant.com> writes:
> On 16 May 2018 at 08:10, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> David Rowley <david.rowley@2ndquadrant.com> writes:
>> Please add to next CF.  It's a bit late to be doing such things in v11,
>> IMO.

> If I do that, it'll go under bug fix.

No, it should go under "planner improvement".  If this were a bug fix,
it'd be a candidate for back-patch, which IMO it's not --- if only
because of the risk of plan destabilization.  But for a more direct
analogy, if you'd submitted some other improvement in selectivity
or cost estimation, that was not a bug fix in the sense of "corrects
outright wrong answers", would you expect it to escape feature freeze
at this point?

Beta or no beta, there has to be a pretty good argument why changes
should go into v11 and not v12 once we're past feature freeze.

            regards, tom lane