Log Message:
-----------
Convert pg_stat_get_backend_idset to use the existing SRF support.
This seems the cleanest way of fixing its lack of a shutdown callback,
which was preventing it from working correctly in a query that didn't
run it to completion. Per bug report from Szima Gbor.
Modified Files:
--------------
pgsql-server/src/backend/utils/adt:
pgstatfuncs.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/pgstatfuncs.c.diff?r1=1.18&r2=1.19)