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https://issues.apache.org/jira/browse/CASSANDRA-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627265#comment-13627265
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Aleksey Yeschenko commented on CASSANDRA-3919:
----------------------------------------------

K, I think I see how "Why do we only call discardDropped if it has re-added 
columns?" is valid. The other thing is most likely wrong, though.

Will push a new, trunk-based, branch tomorrow.
                
> 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: 2.0
>
>
> 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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