LI Guobao created FLINK-15040:

             Summary: Open function is not called in UDF AggregateFunction
                 Key: FLINK-15040
             Project: Flink
          Issue Type: Bug
            Reporter: LI Guobao

I am trying to register a metric in an aggregate UDF by overriding the *open* 
function. According to the documentation, the *open* function can be override 
to retrieve the metric group to do the metric registration. But it works only 
on ScalarFunction but not on AggregateFunction. Because the *open* function is 
not call by AggregateFunction.

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