I would like to resubmit the MERGE patch for PG12. The past discussions about the patch can be found here [1] [2].
The patch is rebased on the current master. But otherwise I haven't done any further work on it since it was punted from PG11. Couple of hackers had expressed desire to review the patch much more carefully and possibly also help in reworking some bits of it. So the idea is to get those reviews going. Once that happens, I can address the review comments in a more meaningful way.
