benibus commented on PR #36575:
URL: https://github.com/apache/arrow/pull/36575#issuecomment-1629426845
This may need more work, unfortunately. I've learned that passing
`stop=None` doesn't produce the same results as it would for python arrays if
`step` is also negative. For instance:
```python
>>> s = pa.scalar("𝑓öõḍš")
>>>
>>> pc.utf8_slice_codeunits(s, start=2, stop=None, step=-1)
<pyarrow.StringScalar: ''>
>>>
>>> s.as_py()[2:None:-1]
'õö𝑓'
```
The current behavior is actually equivalent to this:
```python
>>> s.as_py()[2:sys.maxsize:-1]
''
```
So yeah... expanding the python tests was a good call.
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