pgsql: Fix PQdescribePrepared with more than 7498 params

From: Heikki Linnakangas <heikki(dot)linnakangas(at)iki(dot)fi>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Fix PQdescribePrepared with more than 7498 params
Date: 2026-06-15 09:01:26
Message-ID: E1wZ3CA-000OiK-0l@gemulon.postgresql.org
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Fix PQdescribePrepared with more than 7498 params

If a query has more than 7498 params, the ParameterDescription message
exceeds the 30000 byte limit on messages that are not specifically
marked as possibly being longer than that (VALID_LONG_MESSAGE_TYPE).
To fix, add ParameterDescription to the list.

Author: Ning Sun <classicning(at)gmail(dot)com>
Discussion: https://www.postgresql.org/message-id/dbfb4b65-0aa8-470a-8b87-b6496160b28a@gmail.com
Backpatch-through: 14

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e0511883cae27ec70834c52bbde1863aa11d81e1

Modified Files
--------------
src/interfaces/libpq/fe-protocol3.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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