Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/13470#discussion_r65595938
--- 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 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
--- End diff --
Let's add a space after the second `,`.
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