Horton

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

David Rowley <dgrowleyml@gmail.com>

View thread View on postgr.es
From: David Rowley <dgrowleyml@gmail.com>
To: Yura Sokolov <y.sokolov@postgrespro.ru>
Cc: PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2022-01-25T07:03:07Z
Lists: pgsql-hackers 
On Tue, 25 Jan 2022 at 17:35, Yura Sokolov <y.sokolov@postgrespro.ru> wrote:
> And another attempt to fix tests volatility.

FWIW, I had not really seen the point in adding a test for this.   I
did however see a point in it with your original patch. It seemed
useful there to verify that Gather and GatherMerge did what we
expected with 1 worker.

David

Commits

  1. Consider parallel awareness when removing single-child Appends

  2. Suppress Append and MergeAppend plan nodes that have a single child.