1 files changed, 2 insertions, 1 deletions
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/Metadata.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/Metadata.scala
index 66f123682e..7278501cf8 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/types/Metadata.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/types/Metadata.scala
@@ -168,7 +168,8 @@ object Metadata {
   private def toJsonValue(obj: Any): JValue = {
     obj match {
       case map: Map[_, _] =>
-        val fields = map.toList.map { case (k: String, v) => (k, toJsonValue(v)) }
+        // TODO(josh): exhaustivity
+        val fields = map.toList.map { case (k, v) => (k.toString, toJsonValue(v)) }
         JObject(fields)
       case arr: Array[_] =>
         val values = arr.toList.map(toJsonValue)