[ARROW-12969] [C++] match_substring doesn't match empty needle to empty haystack

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0, 4.0.1
• Fix Version/s: 5.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28688
• Assignee: David Li
• Reporter: David Li
• Created: 04/Jun/21 14:36
• Updated: 11/Jan/23 08:30
• Resolved: 07/Jun/21 16:06

Description

>>> import pyarrow as pa, pyarrow.compute as pc
>>> pa.__version__
'4.0.0'
>>> pc.match_substring(["", "a"], "")
<pyarrow.lib.BooleanArray object at 0x7fd8a77888e0>
[
  false,
  true
]
>>> "" in ""
True 

Also confirmed with PyArrow 4.0.1.

Issue Links

• links to: GitHub Pull Request #10453