There's a patch adding this capability in the current commitfest. See: https://commitfest.postgresql.org/16/1452/ https://commitfest.postgresql.org/16/1452/ I

There's a patch adding this capability in the current commitfest. See: https://commitfest.postgresql.org/16/1452/ https://commitfest.postgresql.org/16/1452/ If everything goes well, it might be in PostgreSQL 11.