Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13638#discussion_r66887975
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala ---
    @@ -87,7 +87,7 @@ private[sql] class CacheManager extends Logging {
           query: Dataset[_],
           tableName: Option[String] = None,
           storageLevel: StorageLevel = MEMORY_AND_DISK): Unit = writeLock {
    -    val planToCache = query.queryExecution.analyzed
    +    val planToCache = query.queryExecution.analyzed.canonicalized
    --- End diff --
    
    do we still need these changes? `LogicalPlan.canonicalized` is a lazy val 
and we don't have performance penalty even we use un-canonicalized plan as key.


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