Jose Torres created SPARK-23703:
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             Summary: Collapse sequential watermarks 
                 Key: SPARK-23703
                 URL: https://issues.apache.org/jira/browse/SPARK-23703
             Project: Spark
          Issue Type: Sub-task
          Components: Structured Streaming
    Affects Versions: 2.4.0
            Reporter: Jose Torres


When there are two sequential EventTimeWatermark nodes in a query plan, the 
topmost one overrides the column tracking metadata from its children, but 
leaves the nodes themselves untouched. When there is no intervening stateful 
operation to consume the watermark, we should remove the lower node entirely.



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