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https://issues.apache.org/jira/browse/FLINK-15040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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LI Guobao updated FLINK-15040:
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    Description: 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 in order to retrieve the metric group to do the metric 
registration. But it works only on ScalarFunction not on AggregateFunction. 
Since the *open* function is not call by AggregateFunction.  (was: 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.)

> Open function is not called in UDF AggregateFunction
> ----------------------------------------------------
>
>                 Key: FLINK-15040
>                 URL: https://issues.apache.org/jira/browse/FLINK-15040
>             Project: Flink
>          Issue Type: Bug
>            Reporter: LI Guobao
>            Priority: Major
>
> 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 
> in order to retrieve the metric group to do the metric registration. But it 
> works only on ScalarFunction not on AggregateFunction. Since the *open* 
> function is not call by AggregateFunction.



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