I think the following comment for store_returning_result() in
postgres_fdw.c is not right.

    /* PGresult must be released before leaving this function. */

I think PGresult should not be released before leaving this function *on
success* in that function.

(I guess the comment has been copied and pasted from that for
get_remote_estimate().)

Thanks,

Best regards,
Etsuro Fujita
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index 7dd43a9..f328833 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -2257,7 +2257,6 @@ static void
 store_returning_result(PgFdwModifyState *fmstate,
 					   TupleTableSlot *slot, PGresult *res)
 {
-	/* PGresult must be released before leaving this function. */
 	PG_TRY();
 	{
 		HeapTuple	newtup;
-- 
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