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No configured-by-FDW events would result in "return" directly out of a
PG_TRY block, making the exception stack dangling. Repair.
Oversight in commit 501cfd07d; back-patch to v14, like that commit, but
as we do not have this issue in HEAD (cf. commit 50c67c201
), no need to
apply this patch to it.
In passing, improve a comment about the handling of in-process requests
in a postgres_fdw.c function called from this function.
Alexander Pyhalov, with comment adjustment/improvement by me.
Discussion: https://postgr.es/m/425fa29a429b21b0332737c42a4fdc70%40postgrespro.ru