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https://issues.apache.org/jira/browse/CASSANDRA-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645045#comment-13645045
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Aleksey Yeschenko commented on CASSANDRA-5443:
----------------------------------------------

Mostly LGTM, the only issue I've spotted is that K_EXISTS has not been added to 
unreserved keywords. This is potentially breaking stuff (not sure about K_IF 
and K_NOT).
                
> Add CAS CQL support
> -------------------
>
>                 Key: CASSANDRA-5443
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5443
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>             Fix For: 2.0
>
>         Attachments: 
> 0001-Refactor-Update-and-Delete-statement-to-extract-common.txt, 
> 0002-Add-syntax-to-support-conditional-update-delete.txt, 
> 0003-Handle-deleted-and-expiring-column-in-paxos-updates.txt, 
> 0004-Support-tombstones-when-comparing-for-CAS.txt, 
> 0005-add-UPDATE-.-IF-NOT-EXISTS-syntax.txt
>
>


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