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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6870) Transform operation
Date Tue, 18 Mar 2014 22:10:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939879#comment-13939879
] 

Edward Capriolo commented on CASSANDRA-6870:
--------------------------------------------

Not very close to UDF support. I think of a UDF as something that would be modiying data between
the storage engine and the result set inside a select The goal is to be able to atomically
manipulate columns server side without knowing their current value. It is like  CAS - C +
 F. FAS function and swap.  

I should do myself a favour and read the UDF tickets. 

> Transform operation
> -------------------
>
>                 Key: CASSANDRA-6870
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6870
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Edward Capriolo
>            Assignee: Edward Capriolo
>            Priority: Minor
>
> Compare and swap uses paxos to only update a value only if some criteria is met. If I
understand correctly we should be able to use this feature to provide a wider variety of server
side operations. 
> For example inside a paxos transaction performing a slice and then using a function to
manipulate the slice. You could accomplish features like append and increment this way without
user needing to know the current value.
> I took a stab at doing this. I **think** I did it correctly. Comments welcome.



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