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https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335526#comment-14335526
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Constance Eustace commented on CASSANDRA-7395:
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Yes, I know I can't use any order by aside from the column clustering/order.
Can you use a UDF as a different clustering algorithm/sorter? The clustering is
a simple sort from what I've gathered from row ranges? Or does it need a hash
function too?
> Support for pure user-defined functions (UDF)
> ---------------------------------------------
>
> Key: CASSANDRA-7395
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7395
> Project: Cassandra
> Issue Type: New Feature
> Components: API, Core
> Reporter: Jonathan Ellis
> Assignee: Robert Stupp
> Labels: client-impacting, cql, docs-impacting
> Fix For: 3.0
>
> Attachments: 7395-dtest.txt, 7395.txt, udf-create-syntax.png,
> udf-drop-syntax.png
>
>
> We have some tickets for various aspects of UDF (CASSANDRA-4914,
> CASSANDRA-5970, CASSANDRA-4998) but they all suffer from various degrees of
> ocean-boiling.
> Let's start with something simple: allowing pure user-defined functions in
> the SELECT clause of a CQL query. That's it.
> By "pure" I mean, must depend only on the input parameters. No side effects.
> No exposure to C* internals. Column values in, result out.
> http://en.wikipedia.org/wiki/Pure_function
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