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

    https://github.com/apache/spark/pull/18930#discussion_r132830750
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
 ---
    @@ -361,10 +361,18 @@ case class JsonTuple(children: Seq[Expression])
       // the fields to query are the remaining children
       @transient private lazy val fieldExpressions: Seq[Expression] = 
children.tail
     
    +  // toString on null will throw NullPointerException so that return a 
very unlikely column name
    +  private val nullFieldName = "__NullFieldName"
    --- End diff --
    
    `A field name given with constant null will be replaced with this pseudo 
field name. `


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