[SPARK-6876] [PySpark] [SQL] add DataFrame na.replace in pyspark

Author: Daoyuan Wang <daoyuan.wang@intel.com>

Closes #6003 from adrian-wang/pynareplace and squashes the following commits:

672efba [Daoyuan Wang] remove py2.7 feature
4a148f7 [Daoyuan Wang] to_replace support dict, value support single value, and add full tests
9e232e7 [Daoyuan Wang] rename scala map
af0268a [Daoyuan Wang] remove na
63ac579 [Daoyuan Wang] add na.replace in pyspark

1 files changed, 7 insertions, 0 deletions

diff --git a/core/src/main/scala/org/apache/spark/api/python/PythonUtils.scala b/core/src/main/scala/org/apache/spark/api/python/PythonUtils.scala
index 9eff0a230c..efb6b93cfc 100644
--- a/core/src/main/scala/org/apache/spark/api/python/PythonUtils.scala
+++ b/core/src/main/scala/org/apache/spark/api/python/PythonUtils.scala
@@ -53,4 +53,11 @@ private[spark] object PythonUtils {
   def toSeq[T](cols: JList[T]): Seq[T] = {
     cols.toList.toSeq
   }
+
+  /**
+   * Convert java map of K, V into Map of K, V (for calling API with varargs)
+   */
+  def toScalaMap[K, V](jm: java.util.Map[K, V]): Map[K, V] = {
+    jm.toMap
+  }
 }