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

    https://github.com/apache/spark/pull/15780#discussion_r90192290
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala 
---
    @@ -590,7 +591,11 @@ object ScalaReflection extends ScalaReflection {
                   "cannot be used as field name\n" + 
walkedTypePath.mkString("\n"))
               }
     
    -          val fieldValue = Invoke(inputObject, fieldName, 
dataTypeFor(fieldType))
    +          // primitive take only non-null or struct takes non-null object 
guarded by isNull
    --- End diff --
    
    So I think we can't very well modeling optional data type like 
Option[Tuple2[Int, String]] with a row.


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