RE: Why is the LSN reported for pg_logical_emit_message() different from other decoded operations?

Dear Torikoshi-san,

Sorry for the late join...

> With the current behavior, consumers need to be aware that only
> logical messages return endptr (and this does not appear to be
> documented, so one would have to discover it through testing).
> Then they need special handling to translate the completion LSN
> for logical messages back to the previous processing position.

Actually I did not recognize till I found the thread, and I'm also unclear
the reason of the difference. From my perspective any blockers within
core are not found.

> For example, I wonder whether Fujitsu's 'Userlog Operation' might
> also be affected:
> https://www.postgresql.fastware.com/hubfs/_Global/Manuals/FEP-v17forx86-
> UserlogOperationGuide.pdf
>

FYI, I confirmed the proprietary won't be affected by the change you proposed.

Best regards,
Hayato Kuroda
FUJITSU LIMITED