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https://issues.apache.org/jira/browse/SPARK-22720?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-22720.
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Resolution: Fixed
Target Version/s: 2.3.0
> Make EventTimeWatermark Extend UnaryNode
> ----------------------------------------
>
> Key: SPARK-22720
> URL: https://issues.apache.org/jira/browse/SPARK-22720
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> Our Analyzer and Optimizer has multiple rules for `UnaryNode`. After making
> `EventTimeWatermark` extend `UnaryNode`, we do not need a special handling
> for `EventTimeWatermark`.
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