Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/21805#discussion_r204378696 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala --- @@ -207,4 +207,7 @@ case class InMemoryRelation( } override protected def otherCopyArgs: Seq[AnyRef] = Seq(statsOfPlanToCache) + + override def simpleString: String = s"InMemoryRelation(${output}, ${cacheBuilder.storageLevel})" --- End diff -- How about `s"InMemoryRelation [${Utils.truncatedString(output, ", ")}], ${cacheBuilder.storageLevel}"`?
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