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https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040554#comment-14040554
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Robert Stupp commented on CASSANDRA-7395:
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CASSANDRA-7392 describes that it should be possible to interrupt "zombie"
queries. It might be useful for badly coded UDFs ("sick endless loop" - might
easily happen during development). But I've no quick idea how to gracefully
stop a thread that's not in a wait(), sleep() or whatever unless a separate
thread is used for UDF evaluation which adds at least .5ms latency for each UDF
call.
> 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
> Fix For: 3.0
>
> Attachments: 7395.diff
>
>
> 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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