Github user clockfly commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14915#discussion_r77559438
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala 
---
    @@ -604,6 +604,7 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]] 
extends Product {
         }.toList
       }
     
    +  // TODO: Fix toJSON so that we can more safely handle Map and Seq with 
loop.
    --- End diff --
    
    I removed this comments. I tried, but it seems it requires a big block to 
explain what this TODO mean. I feel it may creates bigger confusion.


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