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https://issues.apache.org/jira/browse/CASSANDRA-5403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-5403:
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    Attachment: Screen Shot 2013-04-01 at 12.00.09 PM.png

Most of the rest of the time is taken up by CompositeType construction. :-|
                
> Clean up ColumnFamily, ISortedColumns heirarchy
> -----------------------------------------------
>
>                 Key: CASSANDRA-5403
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5403
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 2.0
>
>         Attachments: Screen Shot 2013-04-01 at 12.00.09 PM.png
>
>
> CF wraps ISC but adds no real functionality of its own (post-supercolumn 
> cleanup).
> This means that we're wasting allocations every time we create a CF/ISC pair 
> when really one would do.
> Other things that would be nice to clean up:
> # We often create an empty CF as a placeholder that should not be modified, 
> and rely on convention to avoid such modification.  We could enforce this 
> with a new CF/ISC subclass.
> # Many places still use TMBSC where ABSC would be adequate and cheaper
> # Other places still (ModificationStatement; others?) would be fine using a 
> column container with no sorting requirement at all

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