LI Guobao created FLINK-15040:
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Summary: 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
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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