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https://issues.apache.org/jira/browse/CASSANDRA-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942068#comment-13942068
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Edward Capriolo commented on CASSANDRA-6870:
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{quote}
select parsurl(url, 'host', 'port') as a,b
but that's not very useful for a "transform" operation now is it.
{quote}
Actually breaking a column into two parts is useful because then you can use
other udfs on the parts.
{quote}
insert into table hits (url='http://edssite.com');
insert into table hits (url='http://edssite.com:8080');
insert into table hits (url='http://bobssite.com:8080');
select parsurl(url, 'host', 'port') as host, port where port='8080' and
host='edssite'
{quote}
> 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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