Hi,
Here is a rebased version of this patch series. I've polished the first
two parts a bit - estimation of OR clauses and (Var op Var) clauses, and
added a bunch of regression tests to exercise this code. It's not quite
there yet, but I think it's feasible to get this committed for PG13.
The last part (extended stats on expressions) is far from complete, and
it's not feasible to get it into PG13. There's too much missing stuff.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
