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Tyler Hobbs commented on CASSANDRA-8374: ---------------------------------------- FYI, to generate HTML from the textile files, use {{ant generate-cql-html}}. > Better support of null for UDF > ------------------------------ > > Key: CASSANDRA-8374 > URL: https://issues.apache.org/jira/browse/CASSANDRA-8374 > Project: Cassandra > Issue Type: Improvement > Reporter: Sylvain Lebresne > Assignee: Robert Stupp > Labels: client-impacting, cql3.3, docs-impacting, udf > Fix For: 2.2.x > > Attachments: 8374-3.txt, 8374-3.txt, 8374-5.txt, 8473-1.txt, > 8473-2.txt, 8473-4.txt > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)