[jira] [Created] (ARROW-12769) [Python] Negative out of range slices yield invalid arrays

["Micah Kornfield (Jira)" <ji...@apache.org>]

Micah Kornfield created ARROW-12769:
---------------------------------------

             Summary: [Python] Negative out of range slices yield invalid arrays
                 Key: ARROW-12769
                 URL: https://issues.apache.org/jira/browse/ARROW-12769
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Python
    Affects Versions: 4.0.0, 2.0.0
            Reporter: Micah Kornfield
             Fix For: 5.0.0, 4.0.1


Tested on pyarrow 2.0 and pyarrow 4.0 wheels.  The errors are slightly different between the 2.0.  Below is a script from 4.0

 

This is taken from the result of test_slice_array

{{ }}
{{ >>> import pyarrow as pa}}
{{ >>> pa.array(range(0,10))}}
{{ <pyarrow.lib.Int64Array object at 0x7f59b8bdab20>}}
{{ [}}
{{ 0,}}
{{ 1,}}
{{ 2,}}
{{ 3,}}
{{ 4,}}
{{ 5,}}
{{ 6,}}
{{ 7,}}
{{ 8,}}
{{ 9}}
{{ ]}}
{{ >>> a=pa.array(range(0,10))}}
{{ >>> a[-9:-20]}}
{{ <pyarrow.lib.Int64Array object at 0x7f59b8bdaa00>}}
{{ []}}
{{ >>> len(a[-9:-20])}}
{{ Traceback (most recent call last):}}
{{ File "<stdin>", line 1, in <module>}}
{{ SystemError: <built-in function len> returned NULL without setting an error}}



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