felipecrv opened a new issue, #36776:
URL: https://github.com/apache/arrow/issues/36776
### Describe the bug, including details regarding any error messages,
version, and platform.
`CleanListOffsets` (code below) copies the validity buffer slice starting
from 0, but that can lead to copying the wrong bits when `offsets.offset()` is
greater than 0.
```cpp
ARROW_ASSIGN_OR_RAISE(
auto clean_validity_buffer,
offsets.null_bitmap()->CopySlice(0,
bit_util::BytesForBits(num_offsets - 1)));
```
https://github.com/apache/arrow/blob/3f0b62038d7ddac090db316722f5a1695e85701b/cpp/src/arrow/array/array_nested.cc#L55-L99
The fix is simple: use `CopyBitmap` which knows how to handle offsets at the
bit granularity.
### Component(s)
C++
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