make scalastyle happy

Author: koertkuipers

sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala

@@ -26,8 +26,8 @@ import scala.util.Random
 import org.scalatest.Matchers._
 
 import org.apache.spark.SparkException
-import org.apache.spark.sql.catalyst.plans.logical.{OneRowRelation, Union}
 import org.apache.spark.sql.catalyst.encoders.RowEncoder
+import org.apache.spark.sql.catalyst.plans.logical.{OneRowRelation, Union}
 import org.apache.spark.sql.execution.QueryExecution
 import org.apache.spark.sql.execution.aggregate.TungstenAggregate
 import org.apache.spark.sql.execution.exchange.{BroadcastExchange, ReusedExchange, ShuffleExchange}