Re: Review remove {join,from}_collapse_limit, add enable_join_ordering

Robert Haas <robertmhaas@gmail.com> writes:
> On Thu, Jul 16, 2009 at 11:32 AM, Tom Lane<tgl@sss.pgh.pa.us> wrote:
>> So maybe a redesign of the equivalence-class joinclause mechanism is in
>> order. �Still, this is unlikely to fix the fundamental issue that the
>> time for large join problems grows nonlinearly.

> Nonlinear is one thing, but this looks more like exponential.  I
> understand that the standard planner is exponential; GEQO should not
> be.

Well, the equivclass code is new as of 8.3.  It's possible that this
got broken relatively recently ...
        regards, tom lane