tustvold opened a new issue, #5807:
URL: https://github.com/apache/arrow-rs/issues/5807
**Describe the bug**
<!--
A clear and concise description of what the bug is.
-->
The list encoding concatenates the row values consecutively when
constructing a row
```
/// ```text
///
┌──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┐
/// [1_u8, 2_u8, 3_u8]
│01│01│01│02│01│03│00│00│00│02│00│00│00│02│00│00│00│02│00│00│00│03│
///
└──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┘
/// └──── rows ────┘ └───────── row lengths
─────────┘ └─ count ─┘
///
/// ┌──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┐
/// [1_u8, null] │01│01│00│00│00│00│00│02│00│00│00│02│00│00│00│02│
/// └──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┘
///```
```
When comparing rows this can cause `row` to be incorrectly compared against
`row lengths`, leading to arbitrary results
**To Reproduce**
<!--
Steps to reproduce the behavior:
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```
let mut a = ListBuilder::new(Int8Builder::new());
a.append_value([None]);
a.append_value([None, None]);
let a = a.finish();
let converter =
RowConverter::new(vec![SortField::new(a.data_type().clone())]).unwrap();
let rows = converter.convert_columns(&[Arc::new(a) as _]).unwrap();
assert_eq!(rows.row(0).cmp(&rows.row(1)), Ordering::Less);
```
**Expected behavior**
<!--
A clear and concise description of what you expected to happen.
-->
**Additional context**
<!--
Add any other context about the problem here.
-->
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