On Wed, Dec 5, 2012 at 2:39 PM, Jeff Janes <jeff.janes@gmail.com> wrote:
> I'm not sure that this change would fix your problem, because it might
> also change the costs of the alternative plans in a way that
> neutralizes things. But I suspect it would fix it. Of course, a
> correct estimate of the join size would also fix it--you have kind of
> a perfect storm here.
As far as I can see on the explain, the misestimation is 3x~4x not 200x.