[ARROW-12568] [Python][C++] Segfault when casting a sliced ListArray of int64 in v4.0.0

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.1, 5.0.0
• Component/s: C++, Python
• Labels: pull-request-available segfault
• External issue URL: https://github.com/apache/arrow/issues/28327
• Assignee: yibocai#1
• Reporter: quentin lhoest
• Created: 27/Apr/21 13:40
• Updated: 11/Jan/23 08:27
• Resolved: 03/May/21 15:37

Description

Hi !

I just updated to pyarrow 4.0.0 and I noticed that a segfault happens when casting a sliced ListArray of int64. It crashes on both linux and windows. Here is a code to reproduce:

import pyarrow as pa

arr = pa.array([[i * 10] for i in range(4)])
print(type(arr))  # <class 'pyarrow.lib.ListArray'>
print(arr.type)  # list<item: int64>
arr.cast(pa.list_(pa.int32()))  # works
print(">>> Casting without slicing works")

arr = arr.slice(1)
print(type(arr))  # <class 'pyarrow.lib.ListArray'>
print(arr.type)  # list<item: int64>
arr.cast(pa.list_(pa.int32()))  # crashes !!
print(">>> This message isn't printed because casting with slicing causes a segfault")

On pyarrow 3.0.0 I used to get

ArrowNotImplementedError("Casting sliced lists (non-zero offset) not yet implemented")

instead of the segfault.

Thanks in advance for your help !

Issue Links

• links to: GitHub Pull Request #10184