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Date: Mon, 23 Jun 2014 09:19:24 +0000 (UTC)
From: "Robert Stupp (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12720964.1402602576786.27585.1403515164905@arcas>
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Subject: [jira] [Commented] (CASSANDRA-7395) Support for pure user-defined
 functions (UDF)
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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 ] 

Robert Stupp commented on CASSANDRA-7395:
-----------------------------------------

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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