cloud-fan commented on a change in pull request #29535:
URL: https://github.com/apache/spark/pull/29535#discussion_r479198876



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
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@@ -544,6 +545,8 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] 
extends Product {
     case None => Nil
     case Some(null) => Nil
     case Some(any) => any :: Nil
+    case map: CaseInsensitiveStringMap =>
+      truncatedString(map.entrySet().toArray(), "[", ", ", "]", maxFields) :: 
Nil

Review comment:
       are you sure this returns meaningful string?




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