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From: Tom Lane <[email protected]>
To: Sami Imseih <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Christoph Berg <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: ma lz <[email protected]>
Subject: Re: query_id: jumble names of temp tables for better pg_stat_statement UX
Date: Mon, 24 Mar 2025 22:56:30 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAA5RZ0uNofEXfEfNw3uRN3D3oXkFPQ_s+huLLHMKR_+MCk8RPQ@mail.gmail.com>
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Sami Imseih <[email protected]> writes:
> I agree that some may want stats to merge for the same tables,
> and others may not. I will suggest this with some hesitation, but why not
> make this behavior configurable via a GUC?
> We recently introduced query_id_squash_values for controlling
> the merge of an IN list, maybe this is another queryId behavior we should
> provide a configuration for?

I don't like that GUC and I would not like this one either.  We
learned years ago that GUCs that change query semantics are a bad
idea, but apparently now we have hackers who need to relearn that
lesson the hard way.  (Admittedly, this isn't quite *query* semantics,
which perhaps lessens the blast radius.  But I think we're still going
to regret query_id_squash_values.)

			regards, tom lane






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