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https://issues.apache.org/jira/browse/DERBY-4284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749474#action_12749474
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Knut Anders Hatlen commented on DERBY-4284:
-------------------------------------------
At least one of the test failures shows an actual problem. store/xaOffline1.sql
defines the following view as a right outer join between two diagnostic tables:
create view lock_table as
select
cast(username as char(8)) as username,
cast(t.type as char(8)) as trantype,
cast(l.type as char(8)) as type,
cast(lockcount as char(3)) as cnt,
mode,
cast(tablename as char(12)) as tabname,
cast(lockname as char(10)) as lockname,
state,
status
from
syscs_diag.lock_table l right outer join syscs_diag.transaction_table t
on l.xid = t.xid where l.tableType <> 'S' and t.type='UserTransaction';
Without the patch, all the columns returned by the view are nullable. That's
not correct. However, with the patch, the columns CNT, TABNAME and LOCKNAME are
incorrectly reported as non-nullable. Since those columns come from the left
side of a right outer join, they should be nullable.
> All Columns become Nullable when Using left join
> ------------------------------------------------
>
> Key: DERBY-4284
> URL: https://issues.apache.org/jira/browse/DERBY-4284
> Project: Derby
> Issue Type: Bug
> Components: JDBC, SQL
> Affects Versions: 10.5.1.1
> Environment: Microsoft Windows XP SP3, Sun JDK 6 Update 14
> Reporter: Chua Chee Seng
> Assignee: Knut Anders Hatlen
> Attachments: derby-4284-1a.diff, Main.java
>
>
> Consider following:-
> create table person (
> id varchar(20) not null,
> name varchar(100) not null
> );
> create table car (
> id varchar(20) not null,
> person_id varchar(20) not null,
> model varchar(100) not null,
> plat_no varchar(100) not null
> );
> When select :-
> select
> p.name,
> c.model,
> c.plat_no
> from person p
> left join car c on (p.id = c.person_id);
> From the ResultSet, get the ResultSetMetaData and inspect each column's
> isNullable() value, which is always = 1 (always nullable). Expected : column
> 'p.name' isNullable = 0 (not nullable), but I get 'p.name' isNullable = 1
> (nullable)
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