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[jira] [Created] (FLINK-11203) FunctionContext of AggregateFunction will not be initialized for window GroupBy


Hequn Cheng created FLINK-11203:
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             Summary: FunctionContext of AggregateFunction will not be initialized for window GroupBy
                 Key: FLINK-11203
                 URL: https://issues.apache.org/jira/browse/FLINK-11203
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Hequn Cheng
            Assignee: Hequn Cheng


Currently, in tableApi/SQL, the implementable of aggregation of group window is base on the WindowStream and {{org.apache.flink.api.common.functions.AggregateFunction}}. 
Due to FLINK-11198, metrics cannot be accessed within {{org.apache.flink.table.functions.AggregateFunction}} either. It would be nice if we support metrics for both of them. 



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