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This reverts commit7204f35919, thus restoring66c0185a3(Allow planner to use Merge Append to efficiently implement UNION) as well as the follow-on commitsd5d2205c8,3b1a7eb28,7487044d6. 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.