> The 9.5 release notes contain this promising but cryptic item: > > - Allow foreign data wrappers and custom scans to implement join > pushdown (KaiGai Kohei) > > As phrased, this seems to mean, "it can be done, but we haven't done > it". But there is no link to any documentation that explains how to do > this. The commit that appears to have added this feature touches > postgres_fdw, but neither the documentation nor the tests show anything > about this feature, and I haven't been able to reproduce anything that > would seem to indicate anything like this is at work. > > So what is the actual extent of this feature? > It says these enhancement on interface allows extensions to implement join operation in their own way (including remote join in case of FDW), however, enhancement of postgres_fdw is not yet upstreamed.
So, how about the description below? It focuses on interface enhancement. - Allow extensions to implement join in their own way using foreign data wrappers and customer scan interface. Thanks, -- NEC Business Creation Division / PG-Strom Project KaiGai Kohei <kai...@ak.jp.nec.com> -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers