L. C. Hsieh created SPARK-38549:
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             Summary: SessionWindowStateStoreRestoreExec should provide 
numRowsDroppedByWatermark metric
                 Key: SPARK-38549
                 URL: https://issues.apache.org/jira/browse/SPARK-38549
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 3.3.0
            Reporter: L. C. Hsieh


SessionWindowStateStoreRestoreExec filters out outdated inputs by watermark but 
it doesn't provide numRowsDroppedByWatermark. It makes users confused about 
stream query result.



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