HyukjinKwon commented on a change in pull request #23639: [SPARK-26716][SQL] 
FileFormat: the supported types of read/write should be consistent
URL: https://github.com/apache/spark/pull/23639#discussion_r250913711
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonGenerator.scala
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 @@ -178,7 +178,7 @@ private[sql] class JacksonGenerator(
     var i = 0
     while (i < row.numFields) {
       val field = schema(i)
-      if (!row.isNullAt(i)) {
+      if (!row.isNullAt(i) || field.dataType == NullType) {
 
 Review comment:
   It's trivial but removing `isReadPath` is also a trivial point. I think we 
should either provide an option to control it (which I think is a bit of an 
overkill) or keep the behaviour since other `null`s from other types are being 
ignored but writing out `null`s only for `NullType` sounds counter intuitive.

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