#[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());
}