On 12/24/24 15:00, Richard Guo wrote:
> Any thoughts?
I have a couple of notes.
1. The nulling_relids provides us sensible information about possible
nulls inside the input. We are not using it to estimate the number of
such nulls for now. Does Your idea consist of obtaining 'clear'
statistics and reusing nulling_relids knowledge somewhere later?
2. It is ok for Vars. But what about expressions? We use equal() in
distinct, MCV and dependencies modules. Do we need to remove nulls
before using extended statistics as a general rule?
--
regards, Andrei Lepikhov