Krisztian Szucs created ARROW-9593:
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Summary: [Python] Add custom pickle reducers for Dictionary and
UnionScalar classes
Key: ARROW-9593
URL: https://issues.apache.org/jira/browse/ARROW-9593
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Krisztian Szucs
Fix For: 2.0.0
Since there are no sequence converters available for Dictionary and Union types
we cannot construct them directly thus pa.scalar fail as the reducer function
to reconstruct them.
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