Add a GetForeignUpperPaths callback function for FDWs. This is basically like the just-added create_upper_paths_hook, but control is funneled only to the FDW responsible for all the baserels of the current query; so providing such a callback is much less likely to add useless overhead than using the hook function is.
The documentation is a bit sketchy. We'll likely want to improve it, and/or adjust the call conventions, when we get some experience with actually using this callback. Hopefully somebody will find time to experiment with it before 9.6 feature freeze. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/101fd9349eddb7e9ed84a239145d5230a9bc7336 Modified Files -------------- doc/src/sgml/fdwhandler.sgml | 43 ++++++++++++++++++++++++++++++++--- src/backend/optimizer/README | 5 +++- src/backend/optimizer/plan/planner.c | 16 ++++++++----- src/backend/optimizer/util/pathnode.c | 14 ++++++------ src/include/foreign/fdwapi.h | 6 +++++ 5 files changed, 67 insertions(+), 17 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
