[jira] [Created] (FLINK-40191) Add aggregation support to DataFrame API

[Dian Fu (Jira)]

Dian Fu created FLINK-40191:
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             Summary: Add aggregation support to DataFrame API
                 Key: FLINK-40191
                 URL: https://issues.apache.org/jira/browse/FLINK-40191
             Project: Flink
          Issue Type: Sub-task
          Components: API / Python
            Reporter: Dian Fu


Add global and grouped aggregations through DataFrame.agg(), 
DataFrame.group_by(), and GroupedDataFrame.agg(). 



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