Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19864#discussion_r156294941
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/InMemoryRelation.scala
---
@@ -60,7 +62,8 @@ case class InMemoryRelation(
@transient child: SparkPlan,
tableName: Option[String])(
@transient var _cachedColumnBuffers: RDD[CachedBatch] = null,
- val batchStats: LongAccumulator =
child.sqlContext.sparkContext.longAccumulator)
+ val batchStats: LongAccumulator =
child.sqlContext.sparkContext.longAccumulator,
+ statsOfPlanToCache: Option[Statistics] = None)
--- End diff --
where shall we put the stats parameter? in the main constructor or in the
curried constructor? The major difference is whether we wanna include it in
`equals`/`hashCode`
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