Re: installcheck failure in indirect_toast with default_toast_compression = lz4

From: Justin Pryzby <pryzby(at)telsasoft(dot)com>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org, Robert Haas <robertmhaas(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>
Subject: Re: installcheck failure in indirect_toast with default_toast_compression = lz4
Date: 2021-06-06 20:52:57
Message-ID: 20210606205257.GX14099@telsasoft.com
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On Sat, Jun 05, 2021 at 09:20:43AM +0900, Michael Paquier wrote:
> As said in $subject, installcheck fails once I set up a server with
> default_toast_compression = lz4 in the test indirect_toast. Please
> see the attached for the diffs.
>
> The issue is that the ordering of the tuples returned by UPDATE
> RETURNING is not completely stable. Perhaps we should just enforce
> the order of those tuples by wrapping the DMLs into a CTE and use an
> ORDER BY in the outer query.

See also a prior discussion:
https://www.postgresql.org/message-id/CAFiTN-sm8Dpx3q92g5ohTdZu1_wKsw96-KiEMf3SoK8DhRPfWw%40mail.gmail.com

--
Justin

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