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https://issues.apache.org/jira/browse/SPARK-35800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-35800.
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Fix Version/s: 3.2.0
Resolution: Fixed
Looks like Li Zhang didn't create a ASF Jira account. I'll leave the assignee
as unassigned.
> Improving testability of GroupState in streaming flatMapGroupsWithState
> -----------------------------------------------------------------------
>
> Key: SPARK-35800
> URL: https://issues.apache.org/jira/browse/SPARK-35800
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Affects Versions: 3.1.2
> Reporter: Tathagata Das
> Priority: Major
> Fix For: 3.2.0
>
>
> GroupStateImpl is the internal implementation of the GroupState interface
> which mean to be not exposed. Thus, it only has a private constructor. Such
> access control does benefit encapsulation, however, this introduces
> difficulties for unit tests and the users are calling the engine to construct
> such GroupState instances in order to test their customized state transition
> functions.
> The solution is to introduce new interfaces that allow users to create
> instances of GroupState but also access internal values of what they have set
> (for example, has to state been updated, or removed). This would allow them
> to write unit tests of the state transition function with custom GroupState
> objects and then verifying whether the state was updated in an expected way.
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