Re: pgsql: libpq: Grease the protocol by default

Jacob Champion <jacob.champion@enterprisedb.com>

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From: Jacob Champion <jacob.champion@enterprisedb.com>

To: Tom Lane <tgl@sss.pgh.pa.us>

Cc: Jelte Fennema-Nio <postgres@jeltef.nl>, pgsql-hackers@lists.postgresql.org, Andrew Dunstan <andrew@dunslane.net>

Date: 2026-02-23T23:41:46Z

Lists: pgsql-hackers

Attachments

0001-pg_upgrade-Use-max_protocol_version-3.0-for-older-se.patch (application/octet-stream) patch 0001

On Mon, Feb 23, 2026 at 3:34 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > So a fix belongs in pg_upgrade, IMO, instead of the test. I have a
> > draft passing locally that I should be able to share soon.
>
> Fair enough.

Something like the attached (tested only against 9.2 so far)? I would
plan to backpatch after feature freeze is lifted.

--Jacob

Commits

pg_upgrade: Use max_protocol_version=3.0 for older servers
- c47744ede01c 14.23 landed
- e726620d208e 15.18 landed
- a38ed212ff23 16.14 landed
- ad7fc3f1f83f 17.10 landed
- 1b2773179f31 18.4 landed
- a60a103386a1 19 (unreleased) landed
libpq: Grease the protocol by default
- 4966bd3ed95e 19 (unreleased) cited
libpq: Prepare for protocol grease during 19beta
- d8d7c5dc8f74 19 (unreleased) cited