[ARROW-13158] [Python] Fix repr and contains of StructScalar with duplicate field names

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.0.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28858
• Assignee: Joris Van den Bossche
• Reporter: Joris Van den Bossche
• Created: 24/Jun/21 07:59
• Updated: 11/Jan/23 08:31
• Resolved: 05/Jul/21 16:25

Description

Broken off from ARROW-9997

When having duplicate fields, the repr fails:

In [28]: s = pa.scalar([('a', 1), ('b', 2), ('a', 3)], pa.struct([('a', 'int64'), ('b', 'int64'), ('a', 'int64')]))

In [29]: 0 in s
Out[29]: True

In [30]: s
....
KeyError: 'a'

In addition, the contains (in) operation also shouldn't accept integers (this is also the case for non-duplicate fields)

Issue Links

• links to: GitHub Pull Request #10591