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The temporary hash tables made by pgstat_collect_oids should be allocated in a short-term memory context, which is not the default behavior of hash_create. Noted while looking through hash_create calls in connection with Robert Haas' recent complaint. This is a pre-existing bug, but it doesn't seem important enough to back-patch. The hash table is not so large that it would matter unless this happened many times within a session, which seems quite unlikely.