Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17899#discussion_r238950241
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -734,6 +734,28 @@ object CollapseWindow extends Rule[LogicalPlan] {
}
}
+/**
+ * Transpose Adjacent Window Expressions.
--- End diff --
why is this rule useful?
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