[HOTFIX] MLlib build break.

mllib/src/main/scala/org/apache/spark/mllib/classification/NaiveBayes.scala

@@ -92,7 +92,7 @@ object NaiveBayesModel extends Loader[NaiveBayesModel] {
 
     def save(sc: SparkContext, path: String, data: Data): Unit = {
       val sqlContext = new SQLContext(sc)
-      import sqlContext._
+      import sqlContext.implicits._
 
       // Create JSON metadata.
       val metadataRDD =

mllib/src/main/scala/org/apache/spark/mllib/classification/impl/GLMClassificationModel.scala

@@ -49,7 +49,7 @@ private[classification] object GLMClassificationModel {
         intercept: Double,
         threshold: Option[Double]): Unit = {
       val sqlContext = new SQLContext(sc)
-      import sqlContext._
+      import sqlContext.implicits._
 
       // Create JSON metadata.
       val metadataRDD =

mllib/src/main/scala/org/apache/spark/mllib/regression/impl/GLMRegressionModel.scala

@@ -45,7 +45,7 @@ private[regression] object GLMRegressionModel {
         weights: Vector,
         intercept: Double): Unit = {
       val sqlContext = new SQLContext(sc)
-      import sqlContext._
+      import sqlContext.implicits._
 
       // Create JSON metadata.
       val metadataRDD =