Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16660#discussion_r97347604
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala ---
@@ -71,7 +73,104 @@ object UDT {
}
+// object and classes to test SPARK-19311
+
+// Trait/Interface for base type
+@SQLUserDefinedType(udt = classOf[ExampleBaseTypeUDT])
+sealed trait IExampleBaseType extends Serializable {
+ def field: Int
+}
+
+// Trait/Interface for derived type
+@SQLUserDefinedType(udt = classOf[ExampleSubTypeUDT])
+sealed trait IExampleSubType extends IExampleBaseType
+
+// a base class
+class ExampleBaseClass(override val field: Int) extends IExampleBaseType {
+ override def toString: String = field.toString
--- End diff --
why override `toString` here?
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