jzhuge opened a new pull request #24623: [SPARK-27739][SQL] df.persist should 
save stats from optimized plan
URL: https://github.com/apache/spark/pull/24623
   ## What changes were proposed in this pull request?
   CacheManager.cacheQuery saves the stats from the optimized plan to cache.
   ## How was this patch tested?
   Existing testss.

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