Dear Fujii-san,
> It looks like commit 0c013e08cfb introduced a bug that causes "pg_recvlogical
> --drop-slot"
> without --dbname to check whether it's connected to a specific database and fail
> if it's not.
>
> This commit was added before 9.5, while pg_recvlogical was introduced in 9.4. On
> my env,
> "pg_recvlogical --drop-slot" without --dbname worked as expected in 9.4 but
> started
> failing in 9.5 or later.
>
> So, I think the proper fix is to avoid raising a fatal error even when not connected
> to
> a specific database in --drop-slot action.
+1. I created patch to fix it. 0001 was completely same as you did.
Best regards,
Hayato Kuroda
FUJITSU LIMITED