Ordering on a CASE-expression casues a NullPointerException when using a UNION
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Key: DERBY-2459
URL: https://issues.apache.org/jira/browse/DERBY-2459
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.2.2.1
Environment: Java 1.5.0_06-b05 on Linux Ubuntu 5.10. Derby version
10.2.2
Reporter: Lars Gråmark
When an order by clause involves a CASE-expression as seen below, a
NullPointerException is thrown. The error only occurs when two select
statements are combined in a union (or union all).
select t1.id, CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
from A1 t1
left outer join B1 t2 ON t2.id = t1.ref
union all
select t1.id, CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
from A2 t1
left outer join B2 t2 ON t2.id = t1.ref
order by CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
--Use the following statement to reproduce the problem:
create table A1
(
id char(1)
,value int
,ref char(1)
);
create table A2
(
id char(1)
,value int
,ref char(1)
);
create table B1
(
id char(1)
,value int
);
create table B2
(
id char(1)
,value int
);
insert into A1 (id, value, ref) values ('a', 12, 'e');
insert into A1 (id, value, ref) values ('b', 1, null);
insert into A2 (id, value, ref) values ('c', 3, 'g');
insert into A2 (id, value, ref) values ('d', 8, null);
insert into B1 (id, value) values ('e', 4);
insert into B1 (id, value) values ('f', 2);
insert into B2 (id, value) values ('g', 5);
--
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