[ARROW-9593] [Python] Add custom pickle reducers for DictionaryScalar

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/25657
• Assignee: Krisztian Szucs
• Reporter: Krisztian Szucs
• Created: 29/Jul/20 11:13
• Updated: 11/Jan/23 08:07
• Resolved: 28/Sep/20 09:20

Description

Since there is no sequence converter available for Dictionary type we cannot construct it directly so pa.scalar fail as the reducer function to reconstruct them.

Issue Links

• duplicates: ARROW-9998 [Python] Support pickling DictionaryScalar
• is fixed by: ARROW-9992 [C++][Python] Refactor python to arrow conversions based on a reusable conversion API