[SPARK-10050] [SPARKR] Support collecting data of MapType in DataFrame.

1. Support collecting data of MapType from DataFrame.
2. Support data of MapType in createDataFrame.

Author: Sun Rui <rui.sun@intel.com>

Closes #8711 from sun-rui/SPARK-10050.

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala b/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
index d4b834adb6..f45d119c8c 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
@@ -64,6 +64,12 @@ private[r] object SQLUtils {
       case r"\Aarray<(.*)${elemType}>\Z" => {
         org.apache.spark.sql.types.ArrayType(getSQLDataType(elemType))
       }
+      case r"\Amap<(.*)${keyType},(.*)${valueType}>\Z" => {
+        if (keyType != "string" && keyType != "character") {
+          throw new IllegalArgumentException("Key type of a map must be string or character")
+        }
+        org.apache.spark.sql.types.MapType(getSQLDataType(keyType), getSQLDataType(valueType))
+      }
       case _ => throw new IllegalArgumentException(s"Invaid type $dataType")
     }
   }