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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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Timo Walther closed FLINK-15040.
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Resolution: Won't Fix
Since the old planner has been removed, I will close this issue now. Please
reopen if you think that this topic has not been addressed.
> 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
> Components: Table SQL / Legacy Planner
> Reporter: LI Guobao
> Priority: Minor
> Labels: auto-deprioritized-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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