Re: Avoid excessive inlining?

On Mon, 2020-12-21 at 11:45 -0500, Philip Semanchuk wrote:
> > On Dec 19, 2020, at 12:59 AM, Joel Jacobson <joel@compiler.org> wrote:
> > Is there a way to avoid excessive inlining when writing pure SQL functions, without having to use PL/pgSQL?
> 
> The rules for inlining are here:
> https://wiki.postgresql.org/wiki/Inlining_of_SQL_functions
> 
> According to those rules, if you declared your SQL function as VOLATILE, then Postgres wouldn’t
>  inline it. From your question, I’m not sure if you want to have the same function inlined
>  sometimes and not others. I can’t think of a way to do that offhand.

Where do you see that?  As far as I know, VOLATILE is the best choice if you
want the function to be inlined.

I would say that the simplest way to prevent a function from being inlined
is to set a parameter on it:

  ALTER FUNCTION f() SET enable_seqscan = on;

Yours,
Laurenz Albe
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