Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/15780#discussion_r90189759
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
 ---
    @@ -405,13 +407,12 @@ case class WrapOption(child: Expression, optType: 
DataType)
      * A place holder for the loop variable used in [[MapObjects]].  This 
should never be constructed
      * manually, but will instead be passed into the provided lambda function.
      */
    -case class LambdaVariable(value: String, isNull: String, dataType: 
DataType) extends LeafExpression
    +case class LambdaVariable(value: String, isNull: String, dataType: 
DataType,
    +    nullable: Boolean = true) extends LeafExpression
    --- End diff --
    
    nit: code style should be
    ```
    case class xxx(
      param1: xxx
      param2: xxx) extends ...
    ```


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