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https://issues.apache.org/jira/browse/FLINK-36423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weijie Guo reassigned FLINK-36423:
----------------------------------
Assignee: xuhuang
> RichMapPartitionFunction does not invoke the open method in the
> KeyedPartitionWindowedStream
> --------------------------------------------------------------------------------------------
>
> Key: FLINK-36423
> URL: https://issues.apache.org/jira/browse/FLINK-36423
> Project: Flink
> Issue Type: Bug
> Reporter: xuhuang
> Assignee: xuhuang
> Priority: Minor
> Labels: pull-request-available
>
> In cases like the one below, the {{open}} method of the
> RichMapPartitionFunction not be called, which can lead to unexpected errors
> such as Null Pointer Error.
>
> source.keyBy(xxxx).fullWindowPartition().mapPartition(
> new RichMapPartition(xxxx) {
> public void open(context){
> // some init operations, like object creation
> }
>
> public void mapPartition(xxxx){
> // actual computation logical
> }
> }
> )
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