Add Boolean Expression to secondary querying
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                 Key: CASSANDRA-1598
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1598
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
    Affects Versions: 0.7.0
            Reporter: Todd Nine


Add boolean operators similar to Lucene style searches.  Currently there is 
implicit support for the && operator.  It would be helpful to also add support 
for ||/Union operators.  I would envision this as the client would be required 
to construct the expression tree and pass it via the thrift interface.



BooleanExpression --> BooleanOrIndexExpression
                                     --> BooleanOperator
                                     --> BooleanOrIndexExpression


I'd like to take a crack at this since it will greatly improve my Datanucleus 
plugin


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