[ARROW-12769] [Python] Negative out of range slices yield invalid arrays

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0, 4.0.0
• Fix Version/s: 4.0.1, 5.0.0
• Component/s: C++, Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28510
• Assignee: Joris Van den Bossche
• Reporter: Micah Kornfield
• Created: 12/May/21 23:11
• Updated: 11/Jan/23 08:28
• Resolved: 17/May/21 14:10

Description

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}}

Issue Links

• is cloned by: ARROW-12893 [Python] Slicing array can lead to negative length
• links to: GitHub Pull Request #10341