Dave Johansen <davejohan...@gmail.com> writes:
> ...  So is there a way to make the
> planner perform the same sort of operation and push those same constraints
> into the sub-queries on its own?

No.  As was mentioned upthread, there is a solution for this in 9.1,
although it doesn't work in exactly the way you suggest.

                        regards, tom lane

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