Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20673#discussion_r170478050
--- Diff: core/src/main/scala/org/apache/spark/util/JsonProtocol.scala ---
@@ -17,13 +17,15 @@
package org.apache.spark.util
+import java.io.{ByteArrayOutputStream, PipedInputStream, PipedOutputStream}
--- End diff --
`ByteArrayOutputStream` seems not used here.
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