Antal Sinkovits created HIVE-20440:

             Summary: Create better cache eviction policy for SmallTableCache
                 Key: HIVE-20440
             Project: Hive
          Issue Type: Improvement
          Components: Spark
            Reporter: Antal Sinkovits
            Assignee: Antal Sinkovits

Enhance the SmallTableCache, to use guava cache with soft references, so that 
we evict when there is memory pressure.

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