kawadakk opened a new issue, #7647:
URL: https://github.com/apache/arrow-rs/issues/7647
**Describe the bug**
The `UnionArray::logical_nulls()` of a `slice`-d single-field dense union
array has the length of the original array, not the sliced array.
**To Reproduce**
Add the following to `arrow-array/src/array/union_array.rs`:
```rust
#[test]
fn slice_union_array_single_field() {
// Dense Union
// [1, null, 3, null, 4]
let union_array = {
let mut builder = UnionBuilder::new_dense();
builder.append::<Int32Type>("a", 1).unwrap();
builder.append_null::<Int32Type>("a").unwrap();
builder.append::<Int32Type>("a", 3).unwrap();
builder.append_null::<Int32Type>("a").unwrap();
builder.append::<Int32Type>("a", 4).unwrap();
builder.build().unwrap()
};
// [null, 3, null]
let union_slice = union_array.slice(1, 3);
let logical_nulls = union_slice.logical_nulls().unwrap();
assert_eq!(logical_nulls.len(), 3);
assert!(logical_nulls.is_null(0));
assert!(logical_nulls.is_valid(1));
assert!(logical_nulls.is_null(2));
}
```
```
---- array::union_array::tests::slice_union_array_single_field stdout ----
thread 'array::union_array::tests::slice_union_array_single_field' panicked
at arrow-array/src/array/union_array.rs:1659:9:
assertion `left == right` failed
left: 5
right: 3
```
**Expected behavior**
Not panicking
**Additional context**
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