Yicong Huang created SPARK-56741:
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             Summary: Remove unused GroupPandasUDFSerializer
                 Key: SPARK-56741
                 URL: https://issues.apache.org/jira/browse/SPARK-56741
             Project: Spark
          Issue Type: Sub-task
          Components: PySpark
    Affects Versions: 4.2.0
            Reporter: Yicong Huang


GroupPandasUDFSerializer is no longer used after SPARK-56477 refactored 
SQL_GROUPED_MAP_PANDAS_UDF and SPARK-56691 refactored 
SQL_GROUPED_MAP_PANDAS_ITER_UDF to use ArrowStreamSerializer directly. This 
class can be safely deleted.

Part of SPARK-55384.



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