Re: Optimze usage of immutable functions as relation

I wrote:
> * It would be useful for the commentary to point out that in principle we
> could pull up any immutable (or, probably, even just stable) expression;
> but we don't, (a) for fear of multiple evaluations of the result costing
> us more than we can save, and (b) because a primary goal is to let the
> constant participate in further const-folding, and of course that won't
> happen for a non-Const.

BTW, so far as I can see, none of the test cases demonstrate that such
further const-folding can happen. Since this is all pretty processing-
order-sensitive, I think an explicit test that that's possible would
be a good idea.

regards, tom lane