tustvold opened a new issue, #1595:
URL: https://github.com/apache/arrow-rs/issues/1595
**Describe the bug**
When filtering a UnionArray the output will only include the types that had
at least one value selected by the filter. I think this is a bug, as I would
not expect a filter to mutate the schema of the input
**Expected behavior**
This test should pass
```
let mut builder = UnionBuilder::new_dense(4);
builder.append::<Int32Type>("A", 1).unwrap();
builder.append::<Float64Type>("B", 3.2).unwrap();
let array = builder.build().unwrap();
let filter_array = BooleanArray::from(vec![true, false]);
let c = filter(&array, &filter_array).unwrap();
assert_eq!(array.data_type(), c.data_type())
```
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