Antoine Pitrou created ARROW-2288:
-------------------------------------
Summary: [Python] slicing logic defective
Key: ARROW-2288
URL: https://issues.apache.org/jira/browse/ARROW-2288
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 0.8.0
Reporter: Antoine Pitrou
Assignee: Antoine Pitrou
The slicing logic tends to go too far when normalizing large negative bounds,
which leads to results not in line with Python's slicing semantics:
{code}
>>> arr = pa.array([1,2,3,4])
>>> arr[-99:100]
<pyarrow.lib.Int64Array object at 0x7f550813a318>
[
2,
3,
4
]
>>> arr.to_pylist()[-99:100]
[1, 2, 3, 4]
>>>
>>>
>>> arr[-6:-5]
<pyarrow.lib.Int64Array object at 0x7f54cd76a908>
[
3
]
>>> arr.to_pylist()[-6:-5]
[]
{code}
Also note this crash:
{code}
>>> arr[10:13]
/home/antoine/arrow/cpp/src/arrow/array.cc:105 Check failed: (offset) <=
(data.length)
Abandon (core dumped)
{code}
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