Filter out ColumnFamily rows that aren't part of the query
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Key: CASSANDRA-1125
URL: https://issues.apache.org/jira/browse/CASSANDRA-1125
Project: Cassandra
Issue Type: Improvement
Components: Hadoop
Reporter: Jeremy Hanna
Priority: Minor
Currently, when running a MapReduce job against data in a Cassandra data store,
it reads through all the data for a particular ColumnFamily. This could be
optimized to only read through those rows that have to do with the query.
It's a small change but wanted to put it in Jira so that it didn't fall through
the cracks.
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