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From: Dominique Devienne <[email protected]>
To: Tom Lane <[email protected]>
Cc: Merlin Moncure <[email protected]>
Cc: David G. Johnston <[email protected]>
Cc: Nico Williams <[email protected]>
Cc: Adrian Klaver <[email protected]>
Cc: Laurenz Albe <[email protected]>
Cc: Olleg Samoylov <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: Interesting case of IMMUTABLE significantly hurting performance
Date: Fri, 11 Apr 2025 09:59:18 +0200
Message-ID: <CAFCRh-_H5m_+z=JkKSpmrK=D6nLje1kG11tiCwkC2OXBSD5Ttw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
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On Fri, Apr 11, 2025 at 5:52 AM Tom Lane <[email protected]> wrote:
> Merlin Moncure <[email protected]> writes:
> > I guess the real problems here are lack of feedback on a number of fronts:
> > *) the server knows the function is not immutable but lets you create it
> > anyway, even though it can have negative downstream consequences
>
> That's debatable I think.  If you know what you're doing, you're going
> to be annoyed by warnings telling you that you don't.

True, but that's typically what pragmas in the code are for then,
to explicitly suppress warnings.

Or a new option in the CREATE FUNCTION command. Better safe than sorry,
and I prefer useful "on-by-default" warnings for the non-experts,
which can be disabled, than silence.

PS: And FWIW, I removed all attributes from the functions I'm
writting, based on your aerlier advice Tom.

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