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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