Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18790#discussion_r132094610
--- 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 need to check `deterministic` here, like what we do for the above
case?
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