vegarsti opened a new issue, #9561:
URL: https://github.com/apache/arrow-rs/issues/9561
When MutableArrayData::extend is called on a ListView array, it copies the
offsets and sizes buffers but does not copy the underlying child values. The
result is an array whose offsets/sizes point into an empty values array.
```rust
// Build a ListViewArray: [[1, 2], null, [3]]
let list: ListViewArray = /* ... */;
let data = list.to_data();
let mut mutable = MutableArrayData::new(vec![&data], false, 3);
mutable.extend(0, 0, 3);
let result_list_view: &ListViewArray = /* ... */;
// Offsets and sizes were copied, but values array is empty:
// offsets: [0, 2, 2], sizes: [2, 0, 1], values.len(): 0
```
See repro test here:
https://github.com/vegarsti/arrow-rs/commit/1ee5ae6fb5f8578812b8f457240e7016d14fa91f
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