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https://issues.apache.org/jira/browse/CASSANDRA-350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771935#action_12771935
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Gary Dusbabek commented on CASSANDRA-350:
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On second thought, I don't think we want to do that. If you look at the places
getNextBlock is called (it really should be private) it needs to return true
any time columns are added to blockColumns.
> optimize away unnecessary range scans
> -------------------------------------
>
> Key: CASSANDRA-350
> URL: https://issues.apache.org/jira/browse/CASSANDRA-350
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Gary Dusbabek
> Fix For: 0.5
>
> Attachments: 350-diff-to-v3.patch, cassandra-350-v2-tests.patch,
> cassandra-350-v2.patch, cassandra-350-v3.patch, cassandra-350-v4.patch,
> cassandra-350.patch
>
>
> 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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