Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/3913#discussion_r28439199
--- Diff: core/src/main/scala/org/apache/spark/util/SizeEstimator.scala ---
@@ -28,6 +28,7 @@ import java.util.concurrent.ConcurrentHashMap
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.Logging
+import org.apache.spark.annotation.DeveloperApi
--- End diff --
nit: this import isn't necessary anymore
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