tustvold opened a new issue, #1596:
URL: https://github.com/apache/arrow-rs/issues/1596
**Describe the bug**
build_extend_dense blindly copies offsets from the source array across,
which can lead to invalid offsets in the filtered array
**To Reproduce**
```
let mut builder = UnionBuilder::new_dense(4);
builder.append::<Int32Type>("A", 1).unwrap();
builder.append::<Float64Type>("B", 3.2).unwrap();
builder.append::<Float64Type>("B", 3.2).unwrap();
let array = builder.build().unwrap();
let filter_array = BooleanArray::from(vec![true, false, true]);
let c = filter(&array, &filter_array).unwrap();
let filtered = c.as_any().downcast_ref::<UnionArray>().unwrap();
filtered.value(1);
```
Panics with
```
thread
'compute::kernels::filter::tests::test_filter_union_array_dense_with_nulls'
panicked at 'assertion failed: (offset + length) <= self.len()',
arrow/src/array/data.rs:486:9
****
```
**Expected behavior**
This should not panic
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