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https://issues.apache.org/jira/browse/SPARK-20057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15936115#comment-15936115
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Apache Spark commented on SPARK-20057:
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User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/17385

> Renamed KeyedState to GroupState
> --------------------------------
>
>                 Key: SPARK-20057
>                 URL: https://issues.apache.org/jira/browse/SPARK-20057
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Structured Streaming
>    Affects Versions: 2.1.0
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>             Fix For: 2.2.0
>
>
> Since the state is tied a "group" in the "mapGroupsWithState" operations, its 
> better to call the state "GroupState" instead of a key. This would make it 
> more general if you extends this operation to RelationGroupedDataset and 
> python APIs.



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