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postgres_fdw: Push down aggregates to remote servers.
Now that the upper planner uses paths, and now that we have proper hooksto inject paths into the upper planning process, it's possible forforeign data wrappers to arrange to push aggregates to the remote sideinstead of fetching all of the rows and aggregating them locally. Thisfigures to be a massive win for performance, so teach postgres_fdw todo it.Jeevan Chalke and Ashutosh Bapat. Reviewed by Ashutosh Bapat withadditional testing by Prabhat Sahu. Various mostly cosmetic changesby me.1 parent709e461 commit7012b13
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