On Wed, Apr 13, 2011 at 11:52 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Getting numbers that mean much of anything is a slow, expensive
> process. You really don't want the database trying to do that for you.
> Once you've got them, you *really* don't want the database
> editorializing on them.
>
So it hasn't even been tried.