> -----Original Message----- > From: pgsql-hackers-ow...@postgresql.org > [mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Robert Haas > Sent: Tuesday, June 23, 2015 10:18 PM > To: Kaigai Kouhei(海外 浩平) > Cc: David Rowley; pgsql-hackers@postgresql.org; Tom Lane > Subject: Re: [HACKERS] upper planner path-ification > > On Tue, Jun 23, 2015 at 4:41 AM, Kouhei Kaigai <kai...@ak.jp.nec.com> wrote: > > So, unless we don't find out a solution around planner, 2-phase aggregation > > is > > like a curry without rice.... > > Simon and I spoke with Tom about this upper planner path-ification > problem at PGCon, and he indicated that he intended to work on it > soon, and that we should bug him about it if he doesn't. > > I'm pleased to here this as I seem to have a special talent in that area. > It's fantastic support arm.
So, it may be more productive to pay my efforts for investigation of David Rowley's patch, based on the assumption if we can add partial/final-aggregation path node as if scan/join-paths. My interest also stands on his infrastructure. https://cs.uwaterloo.ca/research/tr/1993/46/file.pdf It is a bit old paper but good starting point. Thanks, -- NEC Business Creation Division / PG-Strom Project KaiGai Kohei <kai...@ak.jp.nec.com> -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
