Laurenz Albe <laurenz.albe@cybertec.at> writes:
> Also, to have PostgreSQL inline the function, which would be good
> for performance, it should be declared IMMUTABLE.
Actually, if you hope to have a SQL function be inlined, it's better
not to decorate it at all --- not with IMMUTABLE, and not with STRICT
either. Both of those restrict the parser's ability to inline unless
it can prove the contained expression is equally immutable/strict.
With the default attributes of volatile/not strict, there's nothing
to prove.
(In any case, it's usually easy enough to tell from EXPLAIN output
whether inlining has happened.)
regards, tom lane
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