Github user clockfly commented on a diff in the pull request: https://github.com/apache/spark/pull/13470#discussion_r65609097 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala --- @@ -427,13 +427,21 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] extends Product { private lazy val allChildren: Set[TreeNode[_]] = (children ++ innerChildren).toSet[TreeNode[_]] /** Returns a string representing the arguments to this node, minus any children */ - def argString: String = productIterator.flatMap { + def argString: String = stringArgs.flatMap { case tn: TreeNode[_] if allChildren.contains(tn) => Nil case Some(tn: TreeNode[_]) if allChildren.contains(tn) => Nil - case tn: TreeNode[_] => s"${tn.simpleString}" :: Nil - case seq: Seq[BaseType] if seq.toSet.subsetOf(children.toSet) => Nil - case seq: Seq[_] => seq.mkString("[", ",", "]") :: Nil - case set: Set[_] => set.mkString("{", ",", "}") :: Nil + case tn: TreeNode[_] => tn.simpleString :: Nil + case seq: Seq[Any] if seq.toSet.subsetOf(allChildren.asInstanceOf[Set[Any]]) => Nil + case iter: Iterable[_] if iter.isEmpty => Nil + case seq: Seq[_] => seq.mkString("[", ", ", "]") :: Nil + case set: Set[_] => set.mkString("{", ", ", "}") :: Nil + case array: Array[_] if array.isEmpty => Nil + case array: Array[_] => array.mkString("[", ", ", "]") :: Nil + case null => Nil + case false => Nil --- End diff -- The default value for boolean is false, if it doesn't exist, then it is false. I think `CacheTableCommand df2` looks better than `CacheTableCommand df, false`?
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