[jira] Updated: (CASSANDRA-350) optimize away unnecessary range scans

["Michael Greene (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Greene updated CASSANDRA-350:
-------------------------------------

    Component/s: Core

> 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
>             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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