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help / color / mirror / Atom feedFrom: Robert Haas <rhaas@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: pg_plan_advice: Fix a bug when a subquery is pruned away entirel
Date: Mon, 13 Apr 2026 14:50:45 +0000
Message-ID: <E1wCIcf-000nmW-0a@gemulon.postgresql.org> (raw)
pg_plan_advice: Fix a bug when a subquery is pruned away entirely.
If a subquery is proven empty, and if that subquery contained a
semijoin, and if making one side or the other of that semijoin
unique and performing an inner join was a possible strategy, then
the previous code would fail with ERROR: no rtoffset for plan %s
when attempting to generate advice. Fix that.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: http://postgr.es/m/CA+TgmobOOmmXSJz3e+cjTY-bA1+W0dqVDqzxUBEvGtW62whYGg@mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/0f93ebb3112d562fe54b685d0ca08c5ba1b41467
Modified Files
--------------
contrib/pg_plan_advice/expected/semijoin.out | 17 +++++++++++++++++
contrib/pg_plan_advice/pgpa_planner.c | 28 ++++++++++++++++------------
contrib/pg_plan_advice/sql/semijoin.sql | 9 +++++++++
3 files changed, 42 insertions(+), 12 deletions(-)
Message-ID: <E1wCIcf-000nmW-0a@gemulon.postgresql.org>
Permalink: ../E1wCIcf-000nmW-0a@gemulon.postgresql.org/
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To: pgsql-committers@postgresql.org
Cc: rhaas@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: pg_plan_advice: Fix a bug when a subquery is pruned away entirel
In-Reply-To: <E1wCIcf-000nmW-0a@gemulon.postgresql.org>
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