[jira] Commented: (DERBY-3631) UDF used with aggregate arguments results in error 30000

["Rick Hillegas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590436#action_12590436 ] 

Rick Hillegas commented on DERBY-3631:
--------------------------------------

Thanks for finding this bug, Donald. I have verified it. As a workaround, you can put the aggregates in a view and invoke your user function on the view. E.g.:

DROP FUNCTION MAXOF2;
DROP VIEW V;
DROP TABLE TEST;

CREATE FUNCTION MAXOF2(ONE DOUBLE, TWO DOUBLE) RETURNS DOUBLE
PARAMETER STYLE JAVA NO SQL LANGUAGE JAVA
EXTERNAL NAME 'java.lang.Math.max';

CREATE TABLE Test( GroupCol INT, Value1 INT, Value2 INT );
INSERT INTO Test VALUES (1, 1, 5);
INSERT INTO Test VALUES (2, -7, 2);
INSERT INTO Test VALUES (2, 1, -5);

CREATE VIEW V ( GroupCol, a, b )
AS SELECT GroupCol, SUM(Value1), SUM(Value2) FROM Test GROUP BY GroupCol;

SELECT GroupCol, MAXOF2( a, b ) as MAXOF2 from v;


> UDF used with aggregate arguments results in error 30000
> --------------------------------------------------------
>
>                 Key: DERBY-3631
>                 URL: https://issues.apache.org/jira/browse/DERBY-3631
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.2.1
>         Environment: Linux, Derby-10.3.2.1
>            Reporter: Donald Munro
>
> UDF used with aggregate arguments results in error 30000: The SELECT list of a grouped query contains at least one invalid expression. 
> CREATE FUNCTION MAXOF2(ONE DOUBLE, TWO DOUBLE) RETURNS DOUBLE 
> PARAMETER STYLE JAVA NO SQL LANGUAGE JAVA
> EXTERNAL NAME 'java.lang.Math.max'
> CREATE TABLE Test( GroupCol INT, Value1 INT, Value2 INT )
> INSERT INTO Test VALUES (1, 1, 5)
> INSERT INTO Test VALUES (2, -7, 2)
> INSERT INTO Test VALUES (2, 1, -5)
> Using a built in function works:
> SELECT GroupCol, MOD(SUM(Value1), SUM(Value2)) AS ModOf2 FROM Test GROUP BY GroupCol
> But using the UDF does not:
> Both
> SELECT GroupCol, MAXOF2(CAST(SUM(Value1) AS DOUBLE), CAST(SUM(Value2) AS DOUBLE)) AS MaxOf2 FROM Test GROUP BY GroupCol
> and
> SELECT GroupCol, MAXOF2(SUM(Value1), SUM(Value2)) AS MaxOf2 FROM Test GROUP BY GroupCol
> fail

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