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https://issues.apache.org/jira/browse/CASSANDRA-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228531#comment-13228531
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Jonathan Ellis commented on CASSANDRA-4041:
-------------------------------------------

bq. to save 2 bytes per-key basically

And because we don't have a way to differentiate between the two -- the 
non-composite is reasonably common in "legacy" Thrift schemas.
                
> 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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