Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/14295#discussion_r71896054
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Last.scala
---
@@ -42,6 +42,17 @@ case class Last(child: Expression, ignoreNullsExpr:
Expression) extends Declarat
override def children: Seq[Expression] = child :: Nil
+ // SPARK-16648: Default `TreeNode.withNewChildren` implementation
doesn't work for `Last` when
--- End diff --
This is not a ScalaDoc comment, so `[[...]]` is not necessary.
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