Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12040#discussion_r58073073
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
---
@@ -451,7 +451,7 @@ abstract class RowNumberLike extends
AggregateWindowFunction {
* A [[SizeBasedWindowFunction]] needs the size of the current window for
its calculation.
*/
trait SizeBasedWindowFunction extends AggregateWindowFunction {
- protected def n: AttributeReference = SizeBasedWindowFunction.n
+ val n: AttributeReference = SizeBasedWindowFunction.n
--- End diff --
It's made a `val` so that the attribute created on driver side is
serialized to executor side.
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