Re: comma vs cross join question

Jason Long <mailing(dot)lists(at)octgsoftware(dot)com> writes:
> I recently upgraded to JBoss AS 6.0.0.Final which includes a newer
> version of Hibernate.
> Previously the Postgres dialect was using a comma, but now is is using
> cross join.
> With the cross join this query never completes. With the comma the
> query is identical to what was there before and takes less than 300 ms.

Those should be semantically equivalent AFAICS. Do you maybe have
join_collapse_limit set to a smaller-than-default value? If not, are
any of those tables really join views?

Please see
http://wiki.postgresql.org/wiki/SlowQueryQuestions
if you need further help, because there's not enough information here
to do more than guess wildly.

regards, tom lane