I noticed that this bugfix has stalled, probably because the other
bugfix has also stalled.
It seems that cleanly returning system columns from table AM is not
going to be a simple task -- whatever fix we get for that is likely not
going to make it all the way to PG 12. So I suggest that we should fix
this bug in 11-13 without depending on that.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services