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

    https://github.com/apache/spark/pull/17302#discussion_r107192456
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala
 ---
    @@ -41,7 +41,20 @@ object CatalystSerde {
       }
     
       def generateObjAttr[T : Encoder]: Attribute = {
    -    AttributeReference("obj", encoderFor[T].deserializer.dataType, 
nullable = false)()
    +    val deserializer = encoderFor[T].deserializer
    +    val dataType = deserializer.dataType
    +    val nullable = if (deserializer.childrenResolved) {
    --- End diff --
    
    How we know it is resolved in above context? In `encoderFor`, it calls 
`e.assertUnresolved` to make sure the returned encoder is unresolved.


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