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https://issues.apache.org/jira/browse/CASSANDRA-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228521#comment-13228521
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Sylvain Lebresne commented on CASSANDRA-4041:
---------------------------------------------

In the case of 'COMPACT STORAGE' we could also allow to add new part to the 
keys (i.e, to 'extend' the composite type). Though given the current 
implementation, it wouldn't work when there is only one 'clustered' key since 
we don't use a comparator in that case (to save 2 bytes per-key basically).
                
> Allow updating column_alias types
> ---------------------------------
>
>                 Key: CASSANDRA-4041
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4041
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API
>            Reporter: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 1.1.1
>
>
> CASSANDRA-3657 has added the ability to change comparators (including parts 
> of a compositeType) when compatible. The code of CQL3 forbids it currently 
> however so we should lift that limitation.

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