On Sat, 18 Oct 2014 11:34:18 -0400, Tom Lane wrote:
> If the comparison value is outside the range recorded in the histogram,
> and there's a suitable index available, the planner uses the index to
> find out the actual column min or max rather than believing the
histogram
> completely. See get
writes:
> Yesterday I was trying to calculate by hand the row number estimates using
> the examples from
> http://www.postgresql.org/docs/9.3/static/row-estimation-examples.html
> It is usually correct, except when you try to get an estimate near the
> first (or last) histogram bound. Let me demon
