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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7395) Support for pure user-defined functions (UDF)
Date Wed, 09 Jul 2014 15:55:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14056371#comment-14056371
] 

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

bq. Anyway, others may have diverging opinions and I don't feel extremely strongly about that,
just saying that I'm not a fan of adding too much syntax for it.

Consensus: 
{noformat}
CREATE FUNCTION bigint math_sum(a bigint, b bigint) {
    return a + b;
};
{noformat}
would create a UDF in the bundle named "" so a {{SELECT math_sum(col_a, col_b) FROM foo}}
would work as well as {{SELECT math::sum(col_a, col_b) FROM foo}} if there is a UDF bundle
"math". Not sure, whether the "" bundle handling bites named bundles - but it should not.
So users have the option to do it the one or the other way - use unbundled UDFs for simple
things and use bundles to group UDFs.

> 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
>              Labels: cql
>             Fix For: 3.0
>
>         Attachments: 7395-v2.diff, 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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