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https://issues.apache.org/jira/browse/FLINK-15040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987694#comment-16987694
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LI Guobao commented on FLINK-15040:
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Hi [~jark], thanks for the quick response. In fact, I am using a branch which
forked the version 1.6. I implemented an AggregateFunction UDF which is used in
Flink SQL. The idea is to do groupBy with this UDF and add a metric inside the
UDF to track the size of aggregated array. I have override the open method and
it seemed it was not called.
> 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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