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From "Radu Radutiu" <rradu...@gmail.com>
Subject UNION (ALL) contraint violation problem
Date Mon, 16 Oct 2006 12:47:32 GMT
Hi,
The following simple test case gives an error:

create table a (f1 varchar(10));
create table b (f2 varchar(10));
insert into b values('test');
select  nullif('x','x') as f0, f1 from a
    union all
    select  nullif('x','x') as f0,  nullif('x','x') as f1 from b;

ERROR 23502: Column 'F0'  cannot accept a NULL value.
SQLState(23502) vendor code(30000)

However the following works ok:
drop table a;
drop table b;
create table a (f1 int);
create table b (f2 int);
insert into b values(1);
select  nullif('x','x') as f0, f1 from a
    union all
    select  nullif('x','x') as f0, nullif(1,1) as f1 from b;

The test case is a simplification of a query generated by Hibernate
with the table per class inheritance strategy. Both queries work ok on
MSSQL and PostgreSQL. On Derby only the second query works, the first
one giving a contraint violation.
Tested on derby v10.1.3.1 and v10.2.1.6 on linux, jdk  1.5.0_06-b05
and jdk  1.6.0-rc-b99.

Is it a known problem or should I open an issue? I could not find
something similar in JIRA.

Regards,

Radu

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