Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14571#discussion_r74183323
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
---
@@ -478,6 +478,7 @@ object SizeBasedWindowFunction {
case class RowNumber() extends RowNumberLike {
override val evaluateExpression = rowNumber
override def sql: String = "ROW_NUMBER()"
--- End diff --
Yep. We can remove `sql` here. The default implementation of `Expression`
can handle this. I will remove `sql` here. Thank you.
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