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From Lars Gråmark (JIRA) <j...@apache.org>
Subject [jira] Created: (DERBY-2459) Ordering on a CASE-expression casues a NullPointerException when using a UNION
Date Fri, 16 Mar 2007 10:41:09 GMT
Ordering on a CASE-expression casues a NullPointerException when using a UNION
------------------------------------------------------------------------------

                 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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