Github user wesm commented on a diff in the pull request:
https://github.com/apache/spark/pull/15821#discussion_r98076494
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -17,13 +17,17 @@
package org.apache.spark.sql
-import java.io.CharArrayWriter
+import java.io.{ByteArrayOutputStream, CharArrayWriter}
+import java.nio.channels.Channels
import scala.collection.JavaConverters._
import scala.language.implicitConversions
import scala.reflect.runtime.universe.TypeTag
import scala.util.control.NonFatal
+import org.apache.arrow.memory.RootAllocator
+import org.apache.arrow.vector.file.ArrowWriter
+import org.apache.arrow.vector.schema.ArrowRecordBatch
--- End diff --
It may be more palatable to encapsulate these details in a class that is
internal to Spark
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