Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/20560#discussion_r180716400 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala --- @@ -169,4 +169,6 @@ case class InMemoryRelation( override protected def otherCopyArgs: Seq[AnyRef] = Seq(_cachedColumnBuffers, sizeInBytesStats, statsOfPlanToCache) + + override def outputOrdering: Seq[SortOrder] = child.outputOrdering --- End diff -- We should carry the logical ordering from the cached logical plan when building the `InMemoryRelation`
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