Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/18509#discussion_r125874046 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/EventTimeWatermarkExec.scala --- @@ -81,7 +81,7 @@ class EventTimeStatsAccum(protected var currentStats: EventTimeStats = EventTime case class EventTimeWatermarkExec( eventTime: Attribute, delay: CalendarInterval, - child: SparkPlan) extends SparkPlan { + child: SparkPlan) extends UnaryExecNode { --- End diff -- I disagree that the simple change requires a JIRA since it's about making the code more readable, but here it comes anyway...https://issues.apache.org/jira/browse/SPARK-21329
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