Thanks for your reply.
On Mon, Feb 4, 2013 at 3:48 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> You're worrying about the wrong thing entirely. The right thing to be
> worrying about is why are some of those row estimates off by four orders
> of magnitude, and what you can do to fix that. The planner will never
> deliver sane plans when its estimates are so far off from reality.
>
>
You mean the rows from explain is bigger then the rows real returned?
It caused by a sub query with a filter like ( a and b ) or ( c and d ),
I've tried to create a temp table for it, the explained rows and the real
rows will similarly.
Here is the full output, http://explain.depesz.com/s/M7oo
> From my perspective, you snipped all the interesting parts of this
> output, because the misestimation is evidently happening somewhere down
> in there.
>
> regards, tom lane
>