[SPARK-6121][SQL][MLLIB] simpleString for UDT

`df.dtypes` shows `null` for UDTs. This PR uses `udt` by default and `VectorUDT` overwrites it with `vector`. jkbradley davies Author: Xiangrui Meng <meng@databricks.com> Closes apache#4858 from mengxr/SPARK-6121 and squashes the following commits: 34f0a77 [Xiangrui Meng] simpleString for UDT
zhpengg · Mar 3, 2015 · 2db6a85 · 2db6a85
1 parent e3a88d1
commit 2db6a85
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diff --git a/python/pyspark/mllib/linalg.py b/python/pyspark/mllib/linalg.py
@@ -152,6 +152,9 @@ def deserialize(self, datum):
         else:
             raise ValueError("do not recognize type %r" % tpe)
 
+    def simpleString(self):
+        return "vector"
+
 
 class Vector(object):
 

diff --git a/python/pyspark/sql/types.py b/python/pyspark/sql/types.py
@@ -468,7 +468,7 @@ def deserialize(self, datum):
         raise NotImplementedError("UDT must implement deserialize().")
 
     def simpleString(self):
-        return 'null'
+        return 'udt'
 
     def json(self):
         return json.dumps(self.jsonValue(), separators=(',', ':'), sort_keys=True)