Hi,
Update some comments in v3.
(CC Pretham, we discuss it in [1])
[1]: https://www.postgresql.org/message-id/flat/CAJUn_kN%2BMhbb8fYP5xxQCq1KEziOinM6HgYx4ts_pPDnQ2y1nQ%40mail.gmail.com
--Regards,ChangAo Chen