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

    https://github.com/apache/spark/pull/18930#discussion_r132846456
  
    --- 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
     
    +  // a field name given with constant null will be replaced with this 
pseudo field name
    +  private val nullFieldName = "__NullFieldName"
    --- End diff --
    
    @jmchung, could we maybe compute this foldable related optimization ahead -
     
https://github.com/jmchung/spark/blob/ffa575a6731fef3e0731b73e0f7311cb024e831b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L425-L439
 and remove this fake field name?
    
    I think we can make a function for the above codes first and then use it 
for computation for each row. Did I understand correctly?
    
    I tried a rough version I thought - 
https://github.com/jmchung/spark/compare/SPARK-21677...HyukjinKwon:tmp-18930?expand=1,
 @viirya what do you think about this?


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