>Thanks.  Movead, please note that the patch is waiting on author?
>Could you send an update if you think that those changes make sense?

I make a patch as Michael Paquier described that use a new function to
return transactionid and origin, and I add a origin version to 
pg_last_committed_xact() too,  now it looks like below:

============================================
postgres=# SELECT txid_current() as txid \gset
postgres=# SELECT * FROM  pg_xact_commit_timestamp_origin(:'txid');
           timestamp                           |   origin 
-------------------------------------+--------
 2020-07-04 17:52:10.199623+08 |      1
(1 row)

postgres=# SELECT * FROM pg_last_committed_xact_with_origin();
 xid  |           timestamp                          | origin 
-----+------------------------------------+--------
 506 | 2020-07-04 17:52:10.199623+08 |      1
(1 row)

postgres=#
============================================

---
Regards,
Highgo Software (Canada/China/Pakistan) 
URL : www.highgo.ca 
EMAIL: mailto:movead(dot)li(at)highgo(dot)ca

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