epsio-banay

Do not push down filter through distinct on

2

## Which issue does this PR close? Closes #12942. ## Rationale for this change Written in issue. ## What changes are included in this PR? Fix for PushDownFilter with DistinctOn....

### Describe the bug a filter should not be pushed down through a distinct on because it will change the results. The PushDownFilter optimizer rule does not behave correctly. ###...