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https://issues.apache.org/jira/browse/FLINK-36423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17886826#comment-17886826
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xuhuang commented on FLINK-36423:
---------------------------------
I found the reduce and aggregate on KeyedPartitionWindowedStream has the same
question, the reason of this two is the WindowOperator does not import rich
reduce function and rich aggregate function, i don't know why so i haven't
change it.
I found that the _reduce_ and _aggregate_ operations on the
_KeyedPartitionWindowedStream_ have a similar issue.
The reason for this is that the _WindowOperator_ does not support rich reduce
function and rich aggregate function. See
org.apache.flink.streaming.runtime.operators.windowing.WindowOperatorBuilder#reduce
I am unsure of the specific reason for this, and as a result, I have not made
any changes to it.
> Support RichMapPartitionFunction on KeyedPartitionWindowedStream
> ----------------------------------------------------------------
>
> Key: FLINK-36423
> URL: https://issues.apache.org/jira/browse/FLINK-36423
> Project: Flink
> Issue Type: Bug
> Reporter: xuhuang
> Priority: Minor
>
> 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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