"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Also, make sure that you run ANALYZE against your temp table right
> before running your query.
Yeah. It's fairly hard to credit that temp_document_ids has any stats
given the way-off estimates for it. Keep in mind that autovacuum
can't help you on temp tables: since only your own session can
access a temp table, you have to ANALYZE it explicitly if you need
the planner to have decent stats about it.
regards, tom lane