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From: David G. Johnston <[email protected]>
To: Tom Lane <[email protected]>
Cc: Merlin Moncure <[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: Thu, 10 Apr 2025 21:13:37 -0700
Message-ID: <CAKFQuwZ-cd6w5-EqM6m+T-W08TCzkS624=w5+gqeDT751_T+EA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Thursday, April 10, 2025, 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.
>

So long as you use atomic SQL functions I suspect it is possible to use the
dependency data to get the volatility of the used functions and compare
them to the volatility of the UDF.

David J.


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