pgsql-bugs(at)postgresql(dot)org writes:
> Running Postgres version 7.01 on Redhat linux 6.2. When joining on
> more than 10 tables not all of the expected results are returned.
Do you get a query plan involving mergejoins for these queries?
If so it's probably fixed for 7.0.3, please try that as soon as
it's out...
regards, tom lane