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https://issues.apache.org/jira/browse/CASSANDRA-9457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14559670#comment-14559670
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Robert Stupp commented on CASSANDRA-9457:
-----------------------------------------
Added a {{isEmptyValueMeaningless()}} method to {{AbstractType}}, which
defaults to {{false}} (and is overridden on old types to return {{true}}).
Also added a unit test to check that behavior (incl a custom type).
Waiting for build#5 on cassci.
[testall
#5|http://cassci.datastax.com/view/Dev/view/snazy/job/snazy-9457-udf-empty-string-testall/5/]
[dtest
#5|http://cassci.datastax.com/view/Dev/view/snazy/job/snazy-9457-udf-empty-string-dtest/5/]
> Empty INITCOND treated as null in aggregate
> -------------------------------------------
>
> Key: CASSANDRA-9457
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9457
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Olivier Michallat
> Assignee: Robert Stupp
> Priority: Minor
> Fix For: 2.2.0 rc1
>
>
> Given the following test data:
> {code}
> cqlsh:test> create table foo(k int, v int, primary key(k,v));
> cqlsh:test> insert into foo(k,v) values(1,1);
> cqlsh:test> insert into foo(k,v) values(1,2);
> cqlsh:test> insert into foo(k,v) values(1,3);
> {code}
> And the following aggregate definition:
> {code}
> cqlsh:test> CREATE FUNCTION cat(s text, v int)
> RETURNS NULL ON NULL INPUT
> RETURNS text
> LANGUAGE java
> AS 'return s + v;';
> cqlsh:test> CREATE AGGREGATE cats(int) SFUNC cat STYPE text INITCOND '';
> {code}
> The following should return '123', but it returns null:
> {code}
> cqlsh:test> select cats(v) from foo where k = 1;
> test.cats(v)
> ---------------
> {code}
> The empty INITCOND is treated as null, and the SFUNC is never called.
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