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From "Constance Eustace (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7395) Support for pure user-defined functions (UDF)
Date Tue, 24 Feb 2015 21:55:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335526#comment-14335526
] 

Constance Eustace commented on CASSANDRA-7395:
----------------------------------------------

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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