Github user drubbo commented on a diff in the pull request:
https://github.com/apache/spark/pull/6193#discussion_r31501082
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/UserDefinedType.scala ---
@@ -53,7 +53,12 @@ abstract class UserDefinedType[UserType] extends
DataType with Serializable {
*/
def serialize(obj: Any): Any
- /** Convert a SQL datum to the user type */
+ /**
+ * Convert a SQL datum to the user type
+ *
+ * This method may be called with an already deserialized datum, so it
should be able to
+ * handle values of UserType too.
+ */
--- End diff --
I think it's related to https://issues.apache.org/jira/browse/SPARK-7186
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