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https://issues.apache.org/jira/browse/SPARK-23703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464853#comment-16464853
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Jose Torres commented on SPARK-23703:
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Up to you. It might be worth asking if there are use cases for that kind of
thing, but on the other hand I don't know of other systems that support it.
> 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
> Priority: Major
>
> 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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