[jira] [Created] (CASSANDRA-8374) Better support of null for UDF

["Sylvain Lebresne (JIRA)" <ji...@apache.org>]

Sylvain Lebresne created CASSANDRA-8374:
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             Summary: Better support of null for UDF
                 Key: CASSANDRA-8374
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8374
             Project: Cassandra
          Issue Type: Bug
            Reporter: Sylvain Lebresne
             Fix For: 3.0


Currently, every function needs to deal with it's argument potentially being {{null}}. There is very many case where that's just annoying, users should be able to define a function like:
{noformat}
CREATE FUNCTION addTwo(val int) RETURNS int LANGUAGE JAVA AS 'return val + 2;'
{noformat}
without having this crashing as soon as a column it's applied to doesn't a value for some rows (I'll note that this definition apparently cannot be compiled currently, which should be looked into).  

In fact, I think that by default methods shouldn't have to care about {{null}} values: if the value is {{null}}, we should not call the method at all and return {{null}}. There is still methods that may explicitely want to handle {{null}} (to return a default value for instance), so maybe we can add an {{ALLOW NULLS}} to the creation syntax.




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