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https://issues.apache.org/jira/browse/CASSANDRA-5864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13734094#comment-13734094
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Jonathan Ellis commented on CASSANDRA-5864:
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This keeps coming up...  is scrub just a "recover damaged information" tool?  
Or should it also perform other edits that may make sense?

Logically it makes more sense to me to put "other edits" into upgradesstables, 
which also has the benefit of making scrub more predictable when it's doing 
some fairly hairy recovery logic, but I'm not sure the code organization lends 
itself to that.
                
> Scrub should discard the columns from CFMetaData.droppedColumns map (if they 
> are old enough)
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5864
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5864
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Aleksey Yeschenko
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: scrub
>
> CASSANDRA-3919 restored ALTER TABLE DROP support in CQL3 and it would be nice 
> to make scrub dropped-columns-aware.

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