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https://issues.apache.org/jira/browse/CASSANDRA-5633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682733#comment-13682733
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Aleksey Yeschenko commented on CASSANDRA-5633:
----------------------------------------------

bq. I don't see how this solves the problem of "I want to CAS row X based on 
the value of row Y." Your example looks more like 3 separate operations each of 
which has CAS-in-same-row.

True. But to match thrift api you are going to need both the ability to update 
several rows in a single cas operation *and* the ability to refer to other rows 
within the same partition in conditions.
                
> CQL support for updating multiple rows in a partition using CAS
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-5633
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5633
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 2.0
>            Reporter: sankalp kohli
>            Priority: Minor
>              Labels: cql3
>             Fix For: 2.0
>
>
> This is currently supported via Thrift but not via CQL. 

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