Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/16493#discussion_r95050745 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala --- @@ -131,6 +132,12 @@ class CacheManager extends Logging { /** Replaces segments of the given logical plan with cached versions where possible. */ def useCachedData(plan: LogicalPlan): LogicalPlan = { + useCachedDataInternal(plan) transformAllExpressions { + case s: SubqueryExpression => s.withNewPlan(useCachedData(s.plan)) + } + } + + private def useCachedDataInternal(plan: LogicalPlan): LogicalPlan = { --- End diff -- After rethinking about it, we do not need to add a new function. We can combine them into a single function, like: ```Scala /** Replaces segments of the given logical plan with cached versions where possible. */ def useCachedData(plan: LogicalPlan): LogicalPlan = { val newPlan = plan transformDown { case currentFragment => lookupCachedData(currentFragment) .map(_.cachedRepresentation.withOutput(currentFragment.output)) .getOrElse(currentFragment) } newPlan transformAllExpressions { case s: SubqueryExpression => s.withNewPlan(useCachedData(s.plan)) } } ```
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