Add support for query rewrite from the metadata
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                 Key: HIVE-2847
                 URL: https://issues.apache.org/jira/browse/HIVE-2847
             Project: Hive
          Issue Type: New Feature
            Reporter: Namit Jain


A simple query like: 

select count(1) from T

should be able to get the results from the metadata instead of scanning the 
complete input table T.

2. the metadata only queries today does not scale to a very large number of 
partitions - that needs to be fixed.

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