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Re: BUG #19493: Assertion failure in pg_plan_advice with EXISTS subquery and DO_NOT_SCAN advice

Никита Калинин <n.kalinin@postgrespro.ru>

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From: Калинин Никита <n.kalinin@postgrespro.ru>
To: Michael Paquier <michael@paquier.xyz>
Cc: pgsql-bugs@lists.postgresql.org, PG Bug reporting form <noreply@postgresql.org>, Pierre Forstmann <pierre.forstmann@gmail.com>
Date: 2026-05-27T00:59:14Z
Lists: pgsql-bugs 
> I am not sure pg_plan_advice is supported with PG 18.4 ?
 
Sorry, the form on the website doesn't allow selecting the master branch, so I have to choose the latest available version instead. But yes, you're right — pg_plan_advice is only available on the master branch.
 
> I cannot reproduce with latest commit from PG 19 master branch
 
Could this be related to GCC? I'm using GCC 16.1.1 and I can reproduce the crash with that version.
 
                                                   version
-------------------------------------------------------------------------------------------------------------
 PostgreSQL 19devel on x86_64-pc-linux-gnu, compiled by gcc (GCC) 16.1.1 20260515 (Red Hat 16.1.1-2), 64-bit
(1 row)
 
commit 9a41b34a28702a71cc0a0e77dd80ca80366d12fb (HEAD -> master, origin/master, origin/HEAD)
Author: Bruce Momjian <bruce@momjian.us>
Date:   Tue May 26 20:17:40 2026 -0400
 
2026-05-27 07:52:49.541 +07 [353027] LOG:  database system was shut down at 2026-05-27 07:52:49 +07
2026-05-27 07:52:49.543 +07 [353022] LOG:  database system is ready to accept connections
TRAP: failed Assert("target->ttype == PGPA_TARGET_IDENTIFIER"), File: "pgpa_trove.c", Line: 182, PID: 353087
postgres: nkpit postgres ::1(45722) EXPLAIN(ExceptionalCondition+0x57) [0xa2d0b7]
/tmp/pg/lib/postgresql/pg_plan_advice.so(+0xb0b2) [0x7f2bd83c70b2]
/tmp/pg/lib/postgresql/pg_plan_advice.so(+0x533f) [0x7f2bd83c133f]
 
--
Nikita Kalinin
 

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  1. pg_plan_advice: DO_NOT_SCAN is a simple tag, not a generic one.

  2. doc: add comma to UPDATE docs, for consistency

  3. Add stack depth check to QueueFKConstraintValidation().