[jira] [Created] (FLINK-17962) Add document for how to define Python UDF with DDL

[Shang Yuanchun (Jira)]

Hequn Cheng created FLINK-17962:
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             Summary: Add document for how to define Python UDF with DDL
                 Key: FLINK-17962
                 URL: https://issues.apache.org/jira/browse/FLINK-17962
             Project: Flink
          Issue Type: Improvement
          Components: API / Python, Documentation
            Reporter: Hequn Cheng






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