[jira] [Commented] (CASSANDRA-7395) Support for pure user-defined functions (UDF)

["Constance Eustace (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333684#comment-14333684 ] 

Constance Eustace commented on CASSANDRA-7395:
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Will I be able to UDF the ORDER BY ? 

My specific case is a sort of union UDT or string with unique sorting

example: cluster column is a UDT, with a UDT field isNum indicating the cluster value is a number and should be sorted against the other numbers in order in the results, but if not, all those either go before or after the numerically-sorted values.

This has come up a few times when trying to smush denormalized SQL schemas into single rowkey entities.

> 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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