Re: Add rows removed by hash join clause to instrumentation

From: Andrei Lepikhov <lepihov(at)gmail(dot)com>
To: Alena Rybakina <lena(dot)ribackina(at)yandex(dot)ru>, pgsql-hackers(at)postgresql(dot)org
Cc: Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>, Ilia Evdokimov <ilya(dot)evdokimov(at)tantorlabs(dot)com>
Subject: Re: Add rows removed by hash join clause to instrumentation
Date: 2026-01-19 19:44:56
Message-ID: fb60811a-9053-4520-a2a1-209344367fd5@gmail.com
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On 19/1/26 20:33, Alena Rybakina wrote:
> I’ve looked through the patch and didn’t spot any obvious issues.
> Instrumentation of this kind is not something we usually test in
> regression tests, but I’ve added a small patch with some test coverage
> and attached it here. For now, I don't have any more suggestions.

I doubt if the 'Rows Removed by Hash Matching' has a platform-stable
value. It makes 'Removed By Join Filter' unstable, too. So, not sure if
specific values may be used in regression tests. Am I wrong?

--
regards, Andrei Lepikhov,
pgEdge

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