Problem:
When inferring predicate, we assume that slot reference need to be inferred. But in this case:
carete table tb1(l1 smallint) ...;
create table tb2(l2 int) ...;
select * from tb1 inner join tb2 where tb1.l1 = tb2.l2 and tb2.l2 = 1;
We can not get tb1.l1 = 1 filter because we will add a cast to l1 (Cast smallint to int l1) = l2.
Solved:
Add cast consideration when inferring predicate, also add change judgement when judging equals to slotreference and cast expression. But when we want to infer predicate from bigger type cast to smaller type, it is logical error.
For example:
select * from tb1 inner join tb2 where tb1.l1 = cast(tb2.l2 as smallint) and tb2.l2 = (number between smallint max and intmax);
tb2.l2 value can not infer to left side because tb1.l1 would be false value, and when we add one more condition like tb1.l1 = tb3.l3(smallint). It would cause this predicate be false.
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