Github user cloud-fan commented on a diff in the pull request:
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/QueryExecution.scala ---
    @@ -61,17 +61,16 @@ class QueryExecution(val sparkSession: SparkSession, 
val logical: LogicalPlan) {
       lazy val analyzed: LogicalPlan = {
    -    sparkSession.sessionState.analyzer.execute(logical)
    +    val plan = sparkSession.sessionState.analyzer.execute(logical)
    +    sparkSession.sharedState.cacheManager.useCachedData(plan)
    -  lazy val withCachedData: LogicalPlan = {
    +  lazy val optimizedPlan: LogicalPlan = {
    -    sparkSession.sharedState.cacheManager.useCachedData(analyzed)
    --- End diff --
    before this PR, we also cache the analyzed plan right?
    I think the major change is that, now we cache `cached plan` instead of 
analyzed plan.

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