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From Tim Dudgeon <tdudg...@informaticsmatters.com>
Subject ArrayIndexOutOfBoundsException when calling function from trigger
Date Fri, 27 Dec 2013 12:05:53 GMT
I'm having problems will calling functions from within a trigger.
The problem seems to be with the outer function call (FLOOR() in this 
case, but it also happens with other functions). It works fine in the 
SELECT statement, but when used in the trigger it throws a 
ArrayIndexOutOfBoundsException.
Remove the FLOOR() part from the trigger and it works fine.



-- create source table and some data
CREATE TABLE foo (name VARCHAR(20), val DOUBLE);
INSERT INTO foo (name, val) VALUES ('A', 10), ('A', 20), ('B', 30), 
('C', 40);

-- calling the function works fine here
SELECT name, FLOOR(AVG(LOG10(val))), COUNT(*)
FROM foo
GROUP BY name;

-- create target table for trigger
CREATE TABLE summary (name VARCHAR(20), aver DOUBLE, size INT);

-- create the trigger
CREATE TRIGGER trg_foo AFTER INSERT ON foo
REFERENCING NEW TABLE AS changed FOR EACH STATEMENT MODE DB2SQL
INSERT INTO summary (name, aver, size)
SELECT name, FLOOR(AVG(LOG10(val))), COUNT(*)
FROM changed
GROUP BY name;

-- insert rows to cause trigger to fire
INSERT INTO foo (name, val) VALUES ('A', 10), ('A', 20), ('B', 30), 
('C', 40);

SELECT * FROM foo;
SELECT * FROM summary;


Any ideas?
Tim


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