Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/16277#discussion_r92331508 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala --- @@ -534,19 +539,16 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product { builder: StringBuilder, verbose: Boolean, prefix: String = ""): StringBuilder = { + if (depth > 0) { lastChildren.init.foreach { isLast => - val prefixFragment = if (isLast) " " else ": " --- End diff -- all these variable names are pretty confusing, so I got rid of all of them.
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