[jira] [Commented] (CASSANDRA-9457) Empty INITCOND treated as null in aggregate

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

    [ https://issues.apache.org/jira/browse/CASSANDRA-9457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567021#comment-14567021 ] 

Sylvain Lebresne commented on CASSANDRA-9457:
---------------------------------------------

bq. No - these methods are just for Java UDFs. Special compose implementations for primitive types.

I'm sure I'm slow but I don't understand how that's a justification in itself. I think we should avoid silently defaulting to a non-null value like those method do and we shouldn't have to provided we only use unboxed types when {{RETURNS NULL ON NULL INPUT}} is used, .

> 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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