On Wed, 2006-04-19 at 18:23, Tom Lane wrote:
> "Clodoaldo Pinto" <clodoaldo.pinto@gmail.com> writes:
> > I'm building a function caller() in which a certain function called()
> > will be called many times in from clauses with the same arguments and
> > I'm wondering if is there a performance penalty for that or if the sql
> > engine is smart enough to call called() only once.
>
> No, it isn't.
HOWEVER, depending on how you declare the function, you should be able
to index it.