diff --git a/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala b/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
index 90faa9c6fec21..86953c32aff85 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
@@ -18,13 +18,14 @@
 package org.apache.spark.sql
 
 import java.io.{ByteArrayOutputStream, CharArrayWriter, DataOutputStream}
-import java.nio.charset.StandardCharsets
 
 import scala.collection.JavaConverters._
 import scala.collection.mutable.ArrayBuffer
 import scala.language.implicitConversions
 import scala.util.control.NonFatal
+
 import org.apache.commons.lang3.StringUtils
+
 import org.apache.spark.{SparkException, TaskContext}
 import org.apache.spark.annotation.{DeveloperApi, Evolving, Experimental, Stable, Unstable}
 import org.apache.spark.api.java.JavaRDD
@@ -39,7 +40,7 @@ import org.apache.spark.sql.catalyst.catalog.HiveTableRelation
 import org.apache.spark.sql.catalyst.encoders._
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.expressions.codegen.GenerateSafeProjection
-import org.apache.spark.sql.catalyst.json.{JSONOptions, JacksonGenerator}
+import org.apache.spark.sql.catalyst.json.{JacksonGenerator, JSONOptions}
 import org.apache.spark.sql.catalyst.optimizer.CombineUnions
 import org.apache.spark.sql.catalyst.parser.{ParseException, ParserUtils}
 import org.apache.spark.sql.catalyst.plans._