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https://issues.apache.org/jira/browse/CASSANDRA-3595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165332#comment-13165332
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Jonathan Ellis commented on CASSANDRA-3595:
-------------------------------------------

The reason we order by partitioner is so that we can give results back in that 
order, which is necessary to do pagination across multiple nodes.
                
> Explore using simple byte comparison for secondary indexes row instead 
> partitioner ordered
> ------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3595
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3595
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Priority: Minor
>
> As remarked on CASSANDRA-3545, I don't think we absolutely need to have the 
> row sorted by the partitioner for secondary indexes. And calculating hashes 
> takes a significant amount of time (even if we take a faster hash: 
> CASSANDRA-3594)

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