Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/3070#discussion_r19773846
--- Diff: python/pyspark/sql.py ---
@@ -408,6 +408,73 @@ def fromJson(cls, json):
return StructType([StructField.fromJson(f) for f in
json["fields"]])
+class UserDefinedType(DataType):
+ """
+ :: WARN: Spark Internal Use Only ::
+ SQL User-Defined Type (UDT).
+ """
+
+ @classmethod
+ def typeName(cls):
+ return cls.__name__.lower()
+
+ @classmethod
+ def sqlType(cls):
+ """
+ Underlying SQL storage type for this UDT.
+ """
+ raise NotImplementedError("UDT must implement sqlType().")
+
+ @classmethod
+ def module(cls):
+ """
+ The Python module of the UDT.
+ """
+ raise NotImplementedError("UDT must implement module().")
+
+ @classmethod
+ def scalaUDT(cls):
+ """
+ The class name of the paired Scala UDT.
+ """
+ raise NotImplementedError("UDT must have a paired Scala UDT.")
+
+ def serialize(self, obj):
+ """
+ Converts the a user-type object into a SQL datum.
--- End diff --
"the a" --> "a"
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