David Mollitor created HIVE-25157:
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             Summary: Clean up QueryResultsCache Code
                 Key: HIVE-25157
                 URL: https://issues.apache.org/jira/browse/HIVE-25157
             Project: Hive
          Issue Type: Improvement
            Reporter: David Mollitor
            Assignee: David Mollitor


* Remove superfluous code
* Simplify lock usage (remove instances of {{synchronization}})
* Re-do "LRU" map. The original contributor's understanding of 
{{LinkedHashMap}} as a {LRU} map is incorrect.
* Simplify code with Guava {{Multimap}}



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