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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: James Coleman <jtc331@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Rafia Sabih <rafia.pghackers@gmail.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Shaun Thomas <shaun.thomas@2ndquadrant.com>
Cc: Dmitry Dolgov <9erthalion6@gmail.com>
Cc: Alexander Korotkov <a.korotkov@postgrespro.ru>
Cc: PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Cc: Andreas Karlsson <andreas@proxel.se>
Subject: Re: [PATCH] Incremental sort (was: PoC: Partial sort)
Date: Mon, 06 Apr 2020 16:48:35 -0400
Message-ID: <19920.1586206115@sss.pgh.pa.us> (raw)
In-Reply-To: <20200406204222.4ulowvv3yzwkivgk@development>
References: <CAAaqYe8fWa8pBUStzW-4JocF+d3pFBVLFmb9rtcD0m12NskBJw@mail.gmail.com>
	<20200402024746.5wlwk6q7eiv5faux@development>
	<CAAaqYe90h3F5NbgtNJAMrXAiGZwML8=_E_qs4MCyYtqea+5Hhg@mail.gmail.com>
	<20200403002028.kp3rxncmwvsui6xz@development>
	<CAAaqYe--jV9pHrX5NRw9R2QGG+nRuPPKguzHhKZwhp6XPOiyuQ@mail.gmail.com>
	<CAAaqYe9XO7ZKrpVkrz2e0ja=eeFCX0Wqpmc7r23R84JU9uCLxQ@mail.gmail.com>
	<20200405130110.2bdxaz4ed5jx2eae@development>
	<20200406195722.teiha6foiy3lix3s@development>
	<20200406201145.ig56cdzrkt4u5mou@development>
	<5595.1586204078@sss.pgh.pa.us>
	<20200406204222.4ulowvv3yzwkivgk@development>

Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> On Mon, Apr 06, 2020 at 04:14:38PM -0400, Tom Lane wrote:
>> Did you ever use force_parallel_mode = regress?

> Ah, not sure - probably not in this round of tests and there were some
> changes in the explain code. Thanks for the hint.

Locally, things pass without force_parallel_mode, but turning it on
produces failures that look similar to rhinoceros's (didn't examine
other BF members).  At a guess, looks like missing or incorrect logic
for propagating some state back from parallel workers.

			regards, tom lane





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