The SQL below works with Mariadb driver 2.7.3. Using drivers 3.0.3 or 3.0.4, java.lang.ArrayIndexOutOfBoundsException occurs.

SELECT
`SNO`,
`PNO`,
CUME_DIST()
OVER(
PARTITION BY
`SNO`,
`PNO`
ORDER BY
CASE
WHEN `QTY` IS NULL THEN 1
ELSE 0
END,
`QTY` ASC
)
FROM
`TSUPPLY`

java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 348

The issue seems to be with partition by because the SQL below(no partition by clause) does not fail

SELECT
`SNO`,
`PNO`,
CUME_DIST()
OVER(
ORDER BY
CASE
WHEN `QTY` IS NULL THEN 1
ELSE 0
END,
`QTY` ASC
)
FROM
`TSUPPLY`

Info for table TSUPPLY

CREATE TABLE IF NOT EXISTS `tsupply` (
`RNUM` int(11) NOT NULL,
`SNO` varchar(2) DEFAULT NULL,
`PNO` varchar(2) DEFAULT NULL,
`JNO` varchar(2) DEFAULT NULL,
`QTY` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `tsupply` (`RNUM`, `SNO`, `PNO`, `JNO`, `QTY`) VALUES
(0, 'S1', 'P1', 'J1', 200),
(1, 'S1', 'P1', 'J4', 700),
(2, 'S2', 'P3', 'J1', 400),
(3, 'S2', 'P3', 'J2', 200),
(4, 'S2', 'P3', 'J3', 200),
(5, 'S2', 'P3', 'J4', 500),
(6, 'S2', 'P3', 'J5', 600),
(7, 'S2', 'P3', 'J6', 400),
(8, 'S2', 'P3', 'J7', 800),
(9, 'S2', 'P5', 'J2', 100),
(10, 'S3', 'P3', 'J1', 200),
(11, 'S3', 'P4', 'J2', 500),
(12, 'S4', 'P6', 'J3', 300),
(13, 'S4', 'P6', 'J7', 300),
(14, 'S5', 'P2', 'J2', 200),
(15, 'S5', 'P2', 'J4', 100),
(16, 'S5', 'P5', 'J5', 500),
(17, 'S5', 'P5', 'J7', 100),
(18, 'S5', 'P6', 'J2', 200),
(19, 'S5', 'P1', 'J4', 100),
(20, 'S5', 'P3', 'J4', 200),
(21, 'S5', 'P4', 'J4', 800),
(22, 'S5', 'P5', 'J4', 400),
(23, 'S5', 'P6', 'J4', 500);