Fan Donglai created SPARK-21716:
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             Summary:  The time-range window can't be applid on the reduce 
operator
                 Key: SPARK-21716
                 URL: https://issues.apache.org/jira/browse/SPARK-21716
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 2.2.0
            Reporter: Fan Donglai


I can't use GroupBy + Window operator to get the newest(the maximum event time) 
row in a window.So pls make the window can be applid on the reduce operator



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