Michael Styles created SPARK-21692:

             Summary: Modify PythonUDF to support nullability
                 Key: SPARK-21692
                 URL: https://issues.apache.org/jira/browse/SPARK-21692
             Project: Spark
          Issue Type: Improvement
          Components: PySpark, SQL
    Affects Versions: 2.2.0
            Reporter: Michael Styles

When creating or registering Python UDFs, a user may know whether null values 
can be returned by the function. PythonUDF and related classes should be 
modified to support nullability.

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