Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -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] = 
    +  // 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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