Re: Fix pg_stat_get_backend_wait_event() for aux processes

3/

+ * pgstat_get_backend_type_by_proc_number() -
+ *
+ *     Return the type of the backend with the specified ProcNumber.
This looks
+ *     directly at the BackendStatusArray, so the return value may be
out of date.
+ *     The only current use of this function is in
pg_signal_backend(), which is
+ *     inherently racy, so we don't worry too much about this.
+ *
+ *     It is the caller's responsibility to use this wisely; at
minimum, callers
+ *     should ensure that procNumber is valid and perform the
required permissions
+ *     checks.
+ * ----------
+ */
+BackendType
+pgstat_get_backend_type_by_proc_number(ProcNumber procNumber)

+extern BackendType pgstat_get_backend_type_by_proc_number(ProcNumber
procNumber);


Maybe I am missing something, but I don't see
pgstat_get_backend_type_by_proc_number
being used.