[jira] [Created] (ARROW-12893) [Python] Slicing array can lead to negative length

["Alessandro Molina (Jira)" <ji...@apache.org>]

Alessandro Molina created ARROW-12893:
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             Summary: [Python] Slicing array can lead to negative length
                 Key: ARROW-12893
                 URL: https://issues.apache.org/jira/browse/ARROW-12893
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Alessandro Molina


Slice an arrow array can lead to a negative length, when instead it should never be smaller than 0.

{code}
arr = pa.array(range(10))
assert len(arr[-9:-20]) == 0
{code}

{{Array.length()}} returns {{-1}} which makes the previous snippet crash as Python never accepts length < 0

In particular if you have Python in debug mode it will explicitly fail the related assertion
{{Assertion failed: (len >= 0 || PyErr_Occurred()), function PyObject_Size, file Objects/abstract.c, line 61}}



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