HawaiianSpork opened a new issue, #6997:
URL: https://github.com/apache/arrow-rs/issues/6997
**Describe the bug**
I introduced a regression with #6805 that causes the writer to panic if the
offset slice is zero and the slice length * 2 is within the end of the original
array.
**To Reproduce**
Example code which reproduces the error:
```rust
let mut ls = GenericListBuilder::<i32, _>::new(UInt32Builder::new());
// ls = [[], [35, 42]
ls.append(true);
ls.values().append_value(35);
ls.values().append_value(42);
ls.append(true);
let original_list = ls.finish();
let original_data = original_list.into_data();
let slice_data = original_data.slice(1, 1);
let (new_offsets, original_start, length) =
reencode_offsets::<i32>(&slice_data.buffers()[0], &slice_data);
// panic
```
**Expected behavior**
Code shouldn't panic and should return the slices.
**Additional context**
Pull request incoming. The code is just making the slice twice as large as
it should.
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