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pgsql: Clarify logic in CreateSubscription().

From:	Jeff Davis <jdavis(at)postgresql(dot)org>
To:	pgsql-committers(at)lists(dot)postgresql(dot)org
Subject:	pgsql: Clarify logic in CreateSubscription().
Date:	2026-08-15 16:54:30
Message-ID:	E1wvHeP-00000000hBe-09Or@gemulon.postgresql.org
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Clarify logic in CreateSubscription().

No bug found in previous code, but it unnecessarily relied on grammar
rules. Per complaint from Coverity.

Reported-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Discussion: https://postgr.es/m/1787286.1786328153@sss.pgh.pa.us
Backpatch-through: 19

Branch
------
master

Modified Files
--------------
src/backend/commands/subscriptioncmds.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

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