introduction of WIP window function patch

Hi,

As I proposed a month before, I am working on window function.
Although this work is at quite early step, I would like to introduce
it since a part of it have been finished. If you can afford and are
interested in it, please review the do***ent and patch, or compile the
applied source to execute an attached sample SQL.

http://umitanuki.net/pgsql/wfv01/design.html

Currently, only aggregation over window does work. I am planning to
work for the combination of window and normal aggregation from now on,
which I guess I can manage to do.

The problem is, as written in the "Things to discussed" section of the
do***ent, how you define window functions (e.g. RANK()). My idea is to
treat them as specialized functions such as SET OF functions and mark
it in pg_proc. But this doesn't resolve RANK() boundary problem.

I am so happy with any kind of comments, reviews or critiques.

Regards,

-- 
Hito**** Harada

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