Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/22429#discussion_r223980665 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala --- @@ -455,21 +457,37 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product { }.mkString(", ") /** ONE line description of this node. */ - def simpleString: String = s"$nodeName $argString".trim + def simpleString(maxFields: Option[Int]): String = { --- End diff -- Please document the `maxFields` parameter. I am especially interested in what `None` represents here.
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