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https://issues.apache.org/jira/browse/DERBY-4284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12748976#action_12748976
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Knut Anders Hatlen commented on DERBY-4284:
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Many regression tests failed with the change (2 failures in suites.All, 21
failures in derbyall). I haven't studied the failures in detail, but it looks
like most of them, if not all, are caused by differences in ij's formatting
when columns are changed from nullable to non-nullable. For instance, a CHAR(2)
NOT column is given space for two characters in the output, whereas a CHAR(2)
column is given space for four characters (to allow NULL to be printed). I
believe this difference is to be expected.
The code below illustrates how ij formats nullable and non-nullable columns
differently:
ij> create table t(col1 char(2) not null, col2 char(2));
0 rows inserted/updated/deleted
ij> select * from t;
C&|COL2
-------
0 rows selected
> 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: 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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