[
https://issues.apache.org/jira/browse/CASSANDRA-7395?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Robert Stupp updated CASSANDRA-7395:
------------------------------------
Attachment: 7395.txt
new patch with support for UDFs as Java source using javassist
Syntax:
{noformat}
CREATE OR REPLACE FUNCTION double foobar(val double) AS JAVA
BODY
// parameter val is of type java.lang.Double
/* return type is of type java.lang.Double */
if (val == null) {
return null;
}
double v = Math.sin( val.doubleValue() );
return Double.valueOf(v);
END BODY;
{noformat}
But does not work with cqlsh (cqlsh needs to be changed to support ';' inside
statements / CREATE BUNDLE/FUNCTION syntax not yet in cqlsh).
Next steps:
* code cleanup (validate UDFs upon statement execution before writing to
system KS table)
* unit tests
> 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.txt
>
>
> 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
--
This message was sent by Atlassian JIRA
(v6.2#6252)
