12933dc604
This reverts commit 7204f35919b7e021e8d1bc9f2d76fd6bfcdd2070, thus restoring 66c0185a3 (Allow planner to use Merge Append to efficiently implement UNION) as well as the follow-on commits d5d2205c8, 3b1a7eb28, 7487044d6. Per further discussion on pgsql-release, we wish to ship beta1 with this feature, and patch the bug that was found just before wrap, rather than shipping beta1 with the feature reverted.