Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14571#discussion_r74182897
--- 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 --
Hi, @rxin .
`sql` function is used in `SQLBuilder`.
https://github.com/apache/spark/pull/14435 will move the SQLBuilder
functionality into `sql` function.
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