optimize metadata only queries
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                 Key: HIVE-1003
                 URL: https://issues.apache.org/jira/browse/HIVE-1003
             Project: Hadoop Hive
          Issue Type: New Feature
          Components: Query Processor
            Reporter: Namit Jain


Queries like:

select max(ds) from T 

where ds is a partitioning column should be optimized.

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