Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/17302#discussion_r107199688 --- 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 -- I made a mistake. I should use `val nullable = if (deserializer.resolved) {`. Even when I made this correction, `deserializer` is resolved. In the above context, it is ensured that `encoderFor[T].deserializer` is resolved in the assertion `require(inputAttributes.forall(_.resolved), "Input attributes must all be resolved.")` at `case class UnresolvedDeserializer`.
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