minor code clean

Author: adrian-wang

sql/core/src/main/scala/org/apache/spark/sql/json/JsonRDD.scala

@@ -125,10 +125,10 @@ private[sql] object JsonRDD extends Logging {
    * Returns the most general data type for two given data types.
    */
   private[json] def compatibleType(t1: DataType, t2: DataType): DataType = {
-    HiveTypeCoercion.findTightestCommonType(t1,t2) match {
+    HiveTypeCoercion.findTightestCommonType(t1, t2) match {
       case Some(commonType) => commonType
       case None =>
-        // t1 or t2 is a StructType, ArrayType, BooleanType, or an unexpected type.
+        // t1 or t2 is a StructType, ArrayType, or an unexpected type.
         (t1, t2) match {
           case (other: DataType, NullType) => other
           case (NullType, other: DataType) => other