vrozov commented on code in PR #49276:
URL: https://github.com/apache/spark/pull/49276#discussion_r1941801041


##########
sql/core/src/main/scala/org/apache/spark/sql/execution/CacheManager.scala:
##########
@@ -126,7 +126,9 @@ class CacheManager extends Logging with 
AdaptiveSparkPlanHelper {
     if (storageLevel == StorageLevel.NONE) {
       // Do nothing for StorageLevel.NONE since it will not actually cache any 
data.
     } else if (lookupCachedDataInternal(normalizedPlan).nonEmpty) {
-      logWarning("Asked to cache already cached data.")
+      logWarning(log"An attempt was made to cache data even though the data 
had already been " +

Review Comment:
   @gengliangwang
   - I disagree that it is super confusing and explained when call to 
`unpersist()` may be necessary.
   - To move this PR forward I updated warning message and removed reference to 
un-cache data.



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