DRILL-4467, I discovered this test.
As you can see, the test is checking that test name confirms that filter is pushed below union all. However, as you can see, the expected result in
DRILL-3257 was updated to a plan which doesn't push the in clause below the filter. I'm disabling the test since 4467 happens to remove what becomes a trivial project. However, we really should fix the core problem (a regression of DRILL-2746.