Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14571#discussion_r74193132
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
---
@@ -675,6 +675,7 @@ case class DenseRank(children: Seq[Expression]) extends
RankLike {
override val aggBufferAttributes = rank +: orderAttrs
override val initialValues = zero +: orderInit
override def sql: String = "DENSE_RANK()"
--- End diff --
`prettyName` is defined to use lower case only.
```
def prettyName: String = nodeName.toLowerCase
```
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