Add function |txid_current_ifassigned()| <https://www.postgresql.org/docs/10/static/functions-info.html#functions-txid-snapshot> to return
->
Add function |txid_current_if_assigned()| <https://www.postgresql.org/docs/10/static/functions-info.html#functions-txid-snapshot> to return