Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/15780#discussion_r90180025 --- 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 -- ExpressionEncoder can't encode `None` at the root level, as Spark SQL doesn't allow top-level row to be null.
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