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https://issues.apache.org/jira/browse/DERBY-3631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648885#action_12648885
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Kathey Marsden commented on DERBY-3631:
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This appears to be fixed with trunk and with 10.3.3.0. I'll try to identify
what fixed it.
> 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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