pgsql: Doc: add comment about bug fixed in back branches as of 3f7323cb

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Doc: add comment about bug fixed in back branches as of 3f7323cb
Date: 2022-08-27 16:16:32
Message-ID: E1oRyU3-0009w1-P7@gemulon.postgresql.org
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Doc: add comment about bug fixed in back branches as of 3f7323cbb.

While the bug I just fixed in the back branches doesn't exist in
HEAD, the requirement that MULTIEXPR SubPlans not share output
parameters still does. Add a comment to memorialize that, because
perhaps it could be an issue again someday.

Discussion: https://postgr.es/m/17596-c5357f61427a81dc@postgresql.org

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d1ce745db2d7db193c0be461db3cd34edd776dac

Modified Files
--------------
src/backend/executor/nodeSubplan.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

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