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https://issues.apache.org/jira/browse/CASSANDRA-1215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12881003#action_12881003
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Jeff Hammerbacher commented on CASSANDRA-1215:
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Hey Ed,
I think the functions you propose are best implemented in a coprocessor-like
framework; see CASSANDRA-1016.
Regards,
Jeff
> Server Side Operations
> ----------------------
>
> Key: CASSANDRA-1215
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1215
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Edward Capriolo
>
> Cassandra values are byte arrays. To operate on these byte arrays a client
> will have to get the value from a server, modify it , and retransmit the
> value back to be set. This is NOT a request for atomic operations, however
> some types of atomic operations may be possible after vector clocks are
> implemented. Regardless of vector clocks or atomic operations, some common
> string operations would still be useful.
> These type of functions may include:
> {noformat}
> append
> substring
> increment
> indexof
> {noformat}
> Operations that work on lists would be more challenging again because
> Cassandra does not know or care what the underlying column data is, but those
> could be specified in the method call.
> {noformat}
> pop (String delimieter )
> itemat(String delimeter, item i)
> {noformat}
> or possibly described in the schema (I do not like this idea but wanted to
> mention it)
> {noformat}
> <ColumnFamily valueDelimeter"\t"> {noformat}
> Also theoretically a user could pass an object implementing an interface or a
> string that is a "little language" that operates on the data to return some
> result or change the data.
> I would like to discuss the merits of such features, and if we decide these
> would be useful I would like to work on implementing them. I can not assign
> myself this ticket otherwise I would have.
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