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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