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This reverts commit 15bc038f9, along with the followon commits 1635e80d3 and 984c92074 that tried to clean up the problems exposed by bug #14825. The result was incomplete because it failed to address parallel-query requirements. With 10.0 release so close upon us, now does not seem like the time to be adding more code to fix that. I hope we can un-revert this code and add the missing parallel query support during the v11 cycle. Back-patch to v10. Discussion: https://postgr.es/m/20170922185904.1448.16585@wrigleys.postgresql.org