Hi,
Attached are revised version of pgsql_fdw patches.
fdw_helper_funcs_v2.patch provides some functions which would be useful
to implement FDW, and document about FDW helper functions including
those which exist in 9.1. They are not specific to pgsql_fdw, so I
separated it from pgsql_fdw patch.
pgsql_fdw_v4.patch provides a FDW for PostgreSQL. This patch requires
fdw_helper_funcs_v2.patch has been applied. Changes done since last
version are:
* Default of fetch_count option is increased to 10000, as suggested by
Pavel Stehule.
* Remove unnecessary NULL check before PQresultStatus.
* Evaluate all conditions on local side even if some of them has been
pushed down to remote side, to ensure that results are correct.
* Use fixed costs for queries which contain external parameter, because
such query can't be used in EXPLAIN command.
Regards,
--
Shigeru Hanada