[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2256) inner join created for not-null="false" many-to-one property

[Stephen M. Wick (JIRA)]

inner join created for not-null="false" many-to-one property
------------------------------------------------------------

         Key: HHH-2256
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2256
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.1.2    
 Environment: MS SQL Server Desktop Ed., Hibernate 3.1.2
    Reporter: Stephen M. Wick


Hibernate generates an inner join when a nullable many-to-one property is specified in the ORDER BY clause of an HQL statement.

If the property specified in the ORDER BY statement is nullable, then Hibernate should generate an OUTER JOIN to allow nulls in the result set.  Instead, for whatever reason, Hibernate put's the property's table in the FROM clause, and JOINS the records with the parent table using a WHERE condition, which is basically an INNER JOIN.  By performing the join this way, records with null values in the property being sorted upon are excluded from the query result set when they shouldn't be.

I also tried adding hibernate-mapping/class/many-to-one/@outer-join="true", and Hibernate generated the same SQL (inner join).

Example HQL:  from Staff order by state.name

state is a many-to-one not-null="false" property of Staff.

Here's the SQL I expected to be generated:

select 
    ...
from
    STAFF staff0_
    left outer join STATE state1_ on staff0_.STATE_ID = state1_.STATE_ID
order by
    state1_.STATE_NAME asc

Here's the SQL that Hibernate generated:

select 
    ...
from
    STAFF staff0_,
    State state1_
where
    staff0_.STATE_ID = state1_.STATE_ID
order by
    state1_.STATE_NAME asc


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