Fix NumericParser

Author: srowen

examples/src/main/scala/org/apache/spark/examples/SparkKMeans.scala

@@ -103,8 +103,9 @@ object SparkKMeans {
     spark.stop()
   }
 
-  private def mergeResults(a: (Vector[Double], Int),
-                           b: (Vector[Double], Int)): (Vector[Double], Int) = {
+  private def mergeResults(
+      a: (Vector[Double], Int),
+      b: (Vector[Double], Int)): (Vector[Double], Int) = {
     (a._1 + b._1, a._2 + b._2)
   }
 }

mllib/src/main/scala/org/apache/spark/mllib/util/NumericParser.scala

@@ -85,10 +85,10 @@ private[mllib] object NumericParser {
     while (parsing && tokenizer.hasMoreTokens()) {
       token = tokenizer.nextToken()
       if (token == "(") {
-        items ++= parseTuple(tokenizer)
+        items += parseTuple(tokenizer)
         allowComma = true
       } else if (token == "[") {
-        items ++= parseArray(tokenizer)
+        items += parseArray(tokenizer)
         allowComma = true
       } else if (token == ",") {
         if (allowComma) {