Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18790#discussion_r132095065
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
 ---
    @@ -410,6 +413,14 @@ object PushProjectionThroughUnion extends 
Rule[LogicalPlan] with PredicateHelper
           } else {
             p
           }
    +
    +    case p @ Project(projectList, watermark: EventTimeWatermark) =>
    +      // Push as long as the project doesn't eliminates the attribute.
    --- End diff --
    
    Do we still need `Project` when `projectList` are identical to the output 
of `EventTimeWatermark`, except the metadata?


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