[jira] [Commented] (FLINK-15040) Open function is not called in UDF AggregateFunction

["Jark Wu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-15040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987581#comment-16987581 ] 

Jark Wu commented on FLINK-15040:
---------------------------------

Hi [~Guobao], thanks for reporting this. Could you give more hints about this issue? For example, what version are you using? what planner are you using? is it a window aggregation or over-window aggregation or regular aggregation? 

> 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 / Planner
>            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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