[ARROW-16174] [C++][Python] FixedSizeListArray.flatten() ignores slicing offsets

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 7.0.0
• Fix Version/s: 10.0.0
• Component/s: C++, Python
• Labels: good-first-issue good-second-issue kernel pull-request-available
• Environment: Windows 10
• External issue URL: https://github.com/apache/arrow/issues/31578
• Assignee: Miles Granger
• Reporter: Sergey Mozharov
• Created: 12/Apr/22 23:19
• Updated: 11/Jan/23 11:42
• Resolved: 21/Sep/22 14:37

Description

Related to ARROW-7362, which is not resolved for fixed size arrays:

import pyarrow as pa

array = pa.array([[1], [2], [3]], type=pa.list_(pa.float64(), list_size=1))
assert array[2:].flatten() != array.flatten()  # <-- assertion fails

# expected behavior
assert array[2:].flatten() == pa.array([3], type=pa.float64())

Variable size lists behave as expected:

array = pa.array([[1], [2], [3]], type=pa.list_(pa.float64()))
assert array[2:].flatten() != array.flatten()  # pass
assert array[2:].flatten() == pa.array([3], type=pa.float64())  # pass

Issue Links

• links to: GitHub Pull Request #14000