cleanup HiveInputFormat.getRecordReader()
-----------------------------------------

                 Key: HIVE-826
                 URL: https://issues.apache.org/jira/browse/HIVE-826
             Project: Hadoop Hive
          Issue Type: Bug
            Reporter: Namit Jain


Currently, the columns needed are stored in the job conf during 
getRecordReader().
It should be part of mapredWork() and used directly by RCFile record reader.

In future, some metadata may be required by other readers (for eg. HBase may 
need something to do a point lookup) - it should be part of mapredWork.

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