Re: how the planner decides between bitmap/index scan

Ops, found it:

http://www.postgresql.org/docs/8.4/static/view-pg-stats.html

("correlation" column)

I guess it would be worth pointing it out in the planner docs...



Scara Maccai wrote:
> Hi,
>
> does the planner know how "scattered" rows are? If yes: where is this
> info stored?