Strange issue with vacuum and temp tables

I saw an interesting problem at a client running PostgreSQL-8.2.4. The client
called me complaining of the good old database must be vacuumed before xx
transactions warning:

WARNING: database "lmdb" must be vacuumed within 10999793 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in
"lmdb".

Only thing is they were running autovacuum on 8.2.4. After some
investigation, and looking in the system views, I found that the cause of the
problems were old temp tables in pg_temp_* schemas.

Now, the backend had been restarted prior to me having a look at it, so I'm
not really sure how the tables are still hanging around. It seems that both
vacuum and autovacuum ignore pg_temp_* schemas and the fix was renaming the
schemas to something that didn't start with pg_temp and then running vacuum.
After that everything was fine.

A look at the code revealed that the temp tables were created via normal
methods, so I'm curious to know if there is a bug regarding temp tables not
going away on Postgresql-8.2.x after the connection is closed?

--
Jeff Frost, Owner <jeff(at)frostconsultingllc(dot)com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954