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https://issues.apache.org/jira/browse/CASSANDRA-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226702#comment-13226702
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Dave Brosius commented on CASSANDRA-3974:
-----------------------------------------

What happens if a column in a ttl'ed column family has a ttl that's longer than 
the cf's ttl? Would that be allowed?
                
> Per-CF TTL
> ----------
>
>                 Key: CASSANDRA-3974
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3974
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>            Priority: Minor
>
> Per-CF TTL would allow compaction optimizations ("drop an entire sstable's 
> worth of expired data") that we can't do with per-column.

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