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From "Yip Ng (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1967) UNION (ALL) contraint violation problem
Date Wed, 18 Oct 2006 07:31:37 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1967?page=comments#action_12443195 ] 
Yip Ng commented on DERBY-1967:

Thanks Army and Bryan for reviewing the patch.  I also have backported this to 10.2 line and
ran derbyall without any problems.

> UNION (ALL) contraint violation problem
> ---------------------------------------
>                 Key: DERBY-1967
>                 URL: http://issues.apache.org/jira/browse/DERBY-1967
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,
>         Environment: derby v10.1.3.1 and v10.2.1.6 on linux (FC5), jdk  1.5.0_06-b05
> and jdk  1.6.0-rc-b99.
>            Reporter: Radu Radutiu
>         Assigned To: Yip Ng
>             Fix For:
>         Attachments: derby1967-trunk-diff01.txt, derby1967-trunk-stat01.txt
> 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.

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