[MLlib] UnaryTransformer nullability should not depend on PrimitiveType.

Author: Reynold Xin <rxin@databricks.com>

Closes #5644 from rxin/mllib-nullable and squashes the following commits:

a727e5b [Reynold Xin] [MLlib] UnaryTransformer nullability should not depend on primitive types.

1 files changed, 1 insertions, 1 deletions

diff --git a/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala b/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala
index 7fb87fe452..0acda71ec6 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala
@@ -94,7 +94,7 @@ private[ml] abstract class UnaryTransformer[IN, OUT, T <: UnaryTransformer[IN, O
       throw new IllegalArgumentException(s"Output column ${map(outputCol)} already exists.")
     }
     val outputFields = schema.fields :+
-      StructField(map(outputCol), outputDataType, !outputDataType.isPrimitive)
+      StructField(map(outputCol), outputDataType, nullable = false)
     StructType(outputFields)
   }