[ARROW-13541] [C++][Python] Implement ExtensionScalar

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0.0
• Component/s: C++, Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/29193
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 03/Aug/21 17:45
• Updated: 11/Jan/23 08:33
• Resolved: 11/Aug/21 17:50

Description

Currently, ExtensionScalar is just an empty shell around the base Scalar class.
It should have a ValueType member, and support the various usual operations (hashing, equality, validation, GetScalar, etc.).

Issue Links

• relates to: ARROW-13612 [Python] Allow specifying a custom type for converting ExtensionScalar to python object
• links to: GitHub Pull Request #10904