[GitHub] spark pull request: [SQL] Add toString to DataFrame/Column

[scwf <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/4436#discussion_r40283225
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala ---
    @@ -67,6 +68,17 @@ abstract class Expression extends TreeNode[Expression] {
       def childrenResolved = !children.exists(!_.resolved)
     
       /**
    +   * Returns a string representation of this expression that does not have developer centric
    +   * debugging information like the expression id.
    +   */
    +  def prettyString: String = {
    +    transform {
    --- End diff --
    
    why use transform here? this will change the expression


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