Re: Expected accuracy of planner statistics

["John D. Burger" <john@xxxxxxxxx>]

Tom Lane wrote:

> The information we've seen says that the only statistically  
> reliable way
> to arrive at an accurate n_distinct estimate is to examine most of the
> table :-(.

> IIRC I picked an equation out of the literature partially on the basis
> of it being simple and fairly cheap to compute...

I'm very curious about this - can you recall where you got this, or  
at least point me to where in the code this happens?

Thanks.

- John Burger
  MITRE