Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22309#discussion_r226148892
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
---
@@ -376,6 +386,23 @@ object ScalaReflection extends ScalaReflection {
dataType = ObjectType(udt.getClass))
Invoke(obj, "deserialize", ObjectType(udt.userClass), getPath ::
Nil)
+ case t if isValueClass(t) =>
+ // nested value class is treated as its underlying type
+ // top level value class must be treated as a product
--- End diff --
This is not true, top level value class can be a single primitive type
column
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