2010/3/23 Daniel Farina <drfar...@acm.org>: > On Tue, Mar 23, 2010 at 12:19 AM, Hitoshi Harada <umi.tan...@gmail.com> wrote: >> If you implement that optimization, we need have kind of >> implicit, homologous qual information. Sure, it's possible. > > I'm not sure precisely what you mean here. Do you predict the > mechanism will be complicated? It's been a burning itch of mine for a > little while now. I do not know exactly how windowing functions look > in Query values just yet, although I'm very familiar with older > structures there.
I believe the changes will probably not be 2-3 lines (ie. a member added to Query structure, etc) if I try it. But the optimizer part is too complicated to me so that I am not sure, either. My idea above is that the similar mechanism you see in GROUP BY optimization will help you and the issue is not so particular about window functions. Regards, -- Hitoshi Harada -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
