From: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Doc: add some commentary about ExecutorRun's NoMovement special
Date: Tue, 10 Dec 2024 22:17:59 +0000
Message-ID: <E1tL8YI-0026Ed-Qy@gemulon.postgresql.org> (raw)
Doc: add some commentary about ExecutorRun's NoMovement special case.
Robert Haas expressed concern about whether commit 3eea7a0c9 exposed
the parallel-execution machinery to a case it isn't tested for, namely
a second non-parallel execution of a plan after a parallel execution.
Investigation shows that that can't happen because of pquery.c's
manipulation of the scan direction, but it sure wasn't obvious to
start with. Add some commentary about that.
Discussion: https://postgr.es/m/CA+TgmoagyKQy=HFw+wLo0AKTYWHui+iKswZ8Jnqqd-cFby-WVg@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/982890530379235974a7e99fd72e862ae40f1400
Modified Files
--------------
src/backend/executor/execMain.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
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To: pgsql-committers@postgresql.org
Cc: tgl@sss.pgh.pa.us, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Doc: add some commentary about ExecutorRun's NoMovement special
In-Reply-To: <E1tL8YI-0026Ed-Qy@gemulon.postgresql.org>
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