Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20831#discussion_r174768746
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala
---
@@ -68,6 +69,15 @@ case class InMemoryRelation(
override protected def innerChildren: Seq[SparkPlan] = Seq(child)
+ override def doCanonicalize(): logical.LogicalPlan =
+ copy(output = output.map(QueryPlan.normalizeExprId(_, child.output)),
+ storageLevel = StorageLevel.NONE,
+ child = child.canonicalized,
+ tableName = None)(
+ _cachedColumnBuffers,
+ sizeInBytesStats,
+ statsOfPlanToCache)
--- End diff --
`_cachedColumnBuffers` can't be null. If it is null, `copy` will trigger
`buildBuffers`.
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