[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2826) IS [NOT] NULL checks with component values

[Steve Ebersole (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28457 ] 

Steve Ebersole commented on HHH-2826:
-------------------------------------

 Note to self:

1) IS NULL should get expanded with AND

Consider:
from Person p where p.name is null

The implication here is we want persons where all parts of their name are null:
select ... from person p where (p.f_name is null and p.l_name is null)


2) IS NOT NULL should get expanded with OR

Consider:
from Person p where p.name is not null

Here, the implication is that not (all parts of their name are null); if any part of the name is not null then this check should logically succeed
select ... from person p where (p.f_name is not null or p.l_name is not null)

the above being functionally equivalent to:
select ... from person p where not ( p.f_name is null and p.l_name is null )

> IS [NOT] NULL checks with component values
> ------------------------------------------
>
>                 Key: HHH-2826
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2826
>             Project: Hibernate3
>          Issue Type: Improvement
>          Components: query-hql
>            Reporter: Steve Ebersole
>            Assignee: Steve Ebersole
>             Fix For: 3.2.6, 3.3
>
>
> Currently the HQL translator attempts to render IS NULL and IS NOT NULL checks against a component using tuple syntax.  Would be much better to instead "explode" these.
> For example, consider Person with a name property which is a component type of Name and the HQL:
> "from Person p where p.name is null"
> Currently, we'd end up with SQL like:
> "... from person p where (p.f_name, p.l_name) is null"
> but the exploded form would make much more sense here:
> "... from person p where ( p.f_name is null and p.l_name is null )"

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