[jira] [Created] (ARROW-9518) [Python] Deprecate Union-based serialization implemented by pyarrow.serialization

[Wes McKinney (Jira)]

Wes McKinney created ARROW-9518:
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             Summary: [Python] Deprecate Union-based serialization implemented 
by pyarrow.serialization
                 Key: ARROW-9518
                 URL: https://issues.apache.org/jira/browse/ARROW-9518
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Wes McKinney
             Fix For: 2.0.0


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