Xiao Li created SPARK-22720:
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Summary: Make EventTimeWatermark 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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