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https://issues.apache.org/jira/browse/CASSANDRA-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935260#action_12935260
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Mck SembWever commented on CASSANDRA-1125:
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this would be a very nice feature.
it has been brought up 
http://thread.gmane.org/gmane.comp.db.cassandra.user/4965 and 
http://thread.gmane.org/gmane.comp.db.cassandra.user/6135


> Filter out ColumnFamily rows that aren't part of the query
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-1125
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1125
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: Jeremy Hanna
>            Assignee: Matthew F. Dennis
>            Priority: Minor
>             Fix For: 0.7.1
>
>
> 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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