optimize away unnecessary range scans
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Key: CASSANDRA-350
URL: https://issues.apache.org/jira/browse/CASSANDRA-350
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Fix For: 0.5
Even when a the columns exist for a given key, they usually won't exist in all
the sstable segments. So avoiding the scan when the column index shows we can,
will be a win.
This is what the todo in SSTableSliceIterator is about:
// TODO push finishColumn down here too, so we can tell when we're done
and optimize away the slice when the index + start/stop shows there's nothing
to scan for
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