Re: IMMUTABLE function's flag do not work: 7.3.4, plpgsql

On Thu, 9 Oct 2003, Gaetano Mendola wrote:

> Andriy Tkachuk wrote:
> > On Wed, 8 Oct 2003, Tom Lane wrote:
> >
> >
> >>Andriy Tkachuk <ant(at)imt(dot)com(dot)ua> writes:
> >>
> >>>At second. calc_total() is immutable function:
> >>>but it seems that it's not cached in one session:
> >>
> >>It's not supposed to be.
> >
> >
> > but it's written id doc:
> >
> > IMMUTABLE indicates that the function always returns the same
> > result when given the same argument values; that is, it does not
> > do database lookups or otherwise use information not directly
> > present in its parameter list. If this option is given, any call
> > of the function with all-constant arguments can be immediately
> > replaced with the function value.
>
> The doc say "can be" not must and will be.

ok, but on what it depends on?

thanks,
andriy

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