tustvold opened a new issue, #1598:
URL: https://github.com/apache/arrow-rs/issues/1598
**Describe the bug**
The filter kernel attempt to filter runs of contiguous slices, this
currently breaks for UnionArrays.
**To Reproduce**
```
#[test]
fn test_filter_run_union_array_dense() {
let mut builder = UnionBuilder::new_dense(3);
builder.append::<Int32Type>("A", 1).unwrap();
builder.append::<Int32Type>("A", 3).unwrap();
builder.append::<Int32Type>("A", 34).unwrap();
let array = builder.build().unwrap();
let filter_array = BooleanArray::from(vec![true, true, false]);
let c = filter(&array, &filter_array).unwrap();
let filtered = c.as_any().downcast_ref::<UnionArray>().unwrap();
let mut builder = UnionBuilder::new_dense(3);
builder.append::<Int32Type>("A", 1).unwrap();
builder.append::<Int32Type>("A", 3).unwrap();
let expected = builder.build().unwrap();
assert_eq!(filtered.data(), expected.data());
}
```
**Expected behavior**
The above test should pass
**Additional context**
Add any other context about the problem here.
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