> > I think it would not work for outer joins if we only check > exprs_known_equal() for equivalences. If the equi-join conditions > involving pairs of matching partition keys are outer join quals > mentioning nonnullable side rels, they would not exist in any EC > according to the current EC infrastructure. So we still have to look > through restrictlist. >
When I wrote that function and even today, EC didn't accommodate outer join equality conditions. If we can somehow do that, have_partkey_equi_join() can be completely eliminated. -- Best Wishes, Ashutosh Bapat
