Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/13116#discussion_r64160441
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -51,6 +49,7 @@ import
org.apache.spark.sql.execution.python.EvaluatePython
import org.apache.spark.sql.types._
import org.apache.spark.storage.StorageLevel
import org.apache.spark.util.Utils
+import org.apache.spark.util.random.SamplingUtils
--- End diff --
I think the imports might be able to be as below:
```scala
import java.io.CharArrayWriter
import java.util.Random
import scala.collection.JavaConverters._
import scala.language.implicitConversions
import scala.reflect.runtime.universe.TypeTag
import scala.util.control.NonFatal
import com.fasterxml.jackson.core.JsonFactory
import org.apache.commons.lang3.StringUtils
import org.apache.spark.annotation.{DeveloperApi, Experimental}
import org.apache.spark.api.java.JavaRDD
import org.apache.spark.api.java.function._
import org.apache.spark.api.python.PythonRDD
import org.apache.spark.broadcast.Broadcast
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.catalyst._
import org.apache.spark.sql.catalyst.analysis._
import org.apache.spark.sql.catalyst.encoders._
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.expressions.aggregate._
import org.apache.spark.sql.catalyst.expressions.objects.Invoke
import org.apache.spark.sql.catalyst.optimizer.CombineUnions
import org.apache.spark.sql.catalyst.plans._
import org.apache.spark.sql.catalyst.plans.logical._
import org.apache.spark.sql.catalyst.util.usePrettyExpression
import org.apache.spark.sql.execution.{FileRelation, LogicalRDD,
QueryExecution, SQLExecution}
import org.apache.spark.sql.execution.command.ExplainCommand
import
org.apache.spark.sql.execution.datasources.{CreateTableUsingAsSelect,
LogicalRelation}
import org.apache.spark.sql.execution.datasources.json.JacksonGenerator
import org.apache.spark.sql.execution.python.EvaluatePython
import org.apache.spark.sql.types._
import org.apache.spark.storage.StorageLevel
import org.apache.spark.util.Utils
import org.apache.spark.util.random.SamplingUtils
```
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