Re: Fix BUG #17335: Duplicate result rows in Gather node

В Сб, 01/01/2022 в 15:19 +1300, David Rowley пишет:
> On Fri, 31 Dec 2021 at 00:14, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru> wrote:
> > Problem:
> > - Append path is created with explicitely parallel_aware = true
> > - It has two child, one is trivial, other is parallel_aware = false .
> > Trivial child is dropped.
> > - Gather/GatherMerge path takes Append path as a child and thinks
> > its child is parallel_aware = true.
> > - But Append path is removed at the last since it has only one child.
> > - Now Gather/GatherMerge thinks its child is parallel_aware, but it
> > is not.
> > Gather/GatherMerge runs its child twice: in a worker and in a leader,
> > and gathers same rows twice.
>
> Thanks for the report. I can confirm that I can recreate the problem
> with your script.
>
> I will look into this further later next week.
>

Good day, David.

Excuse me for disturbing.
Any update on this?
Any chance to be fixed in next minor release?
Could this simple fix be merged before further improvements?

Yura.