Allow to specify a user supplied row key comparator for a table 
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                 Key: HBASE-661
                 URL: https://issues.apache.org/jira/browse/HBASE-661
             Project: Hadoop HBase
          Issue Type: New Feature
          Components: client, master, regionserver
    Affects Versions: 0.2.0
            Reporter: Clint Morgan


Now that row keys are byte arrays, users should be able to specify a comparator 
at table creation time.

My use case for this is to implement secondary indexes. In this case, row keys 
for the index tables will be constructed from an optional prefix of the 
original row key as well as the content of column that is being indexed. Then 
the comparator will first compare based on the key prefix, and break ties by 
deserializing the column values and using the deserialized type's compareTo 
method.


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