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https://issues.apache.org/jira/browse/ARROW-12893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Molina resolved ARROW-12893.
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Resolution: Fixed
> [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
> Assignee: Alessandro Molina
> Priority: Major
>
> 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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