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https://issues.apache.org/jira/browse/CASSANDRA-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13604113#comment-13604113
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Jonathan Ellis commented on CASSANDRA-3919:
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Does limiting RENAME mean we can't change the "columnN" defaults that upgraded 
< 1.2 tables would have?
                
> Dropping a column should do more than just remove the definition
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-3919
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3919
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Aleksey Yeschenko
>              Labels: compaction, cql
>             Fix For: 1.2.4
>
>
> Dropping a column should:
> - immediately make it unavailable for {{SELECT}}, including {{SELECT *}}
> - eventually (i.e., post-compaction) reclaim the space formerly used by that 
> column

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