Re: [HACKERS] What is the extent of FDW join pushdown support in 9.5?
On Wed, Sep 16, 2015 at 04:32:51PM -0400, Peter Eisentraut wrote: > On 9/15/15 10:02 PM, Kouhei Kaigai wrote: > >> 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. > > Thank you for this clarification. I suppose this item is correct as > written. Yes, it was cryptically written on purpose. ;-) -- Bruce Momjian http://momjian.us EnterpriseDB http://enterprisedb.com + As you are, so once was I. As I am, so you will be. + + Roman grave inscription + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] What is the extent of FDW join pushdown support in 9.5?
On 9/15/15 10:02 PM, Kouhei Kaigai wrote: >> 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. Thank you for this clarification. I suppose this item is correct as written. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] What is the extent of FDW join pushdown support in 9.5?
> 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 -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
