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We can revert the code changes of commitb5febc1d1
now, because commit9a3ddeb51
installed a real solution for the difficulty thatb5febc1d1
just dodged, namely that the planner might pick the wrong one of several index columns nominally containing the same value. It only matters which one we pick if we pick one that's not returnable, and that mistake is now foreclosed. Although both of the aforementioned commits were back-patched, I don't feel a need to take any risk by back-patching this one. The cases that it improves are very corner-ish. Discussion: https://postgr.es/m/3179992.1641150853@sss.pgh.pa.us