[hibernate-dev] [ORM] Query with condition on subclass attribute

[Gail Badner]

I don't see it documented in the user guide. Is it safe to assume that this
functionality won't be going away?

On Wed, Jul 1, 2020 at 5:11 PM Steve Ebersole <steve at hibernate.org> wrote:

> It is not portable.  Hibernate applies an implicit treat-as operation in
> such cases.  This is actually Hibernate's behavior from the beginning.  JPA
> says this should use an explicit treat-as operation.
>
> On Wed, Jul 1, 2020, 4:58 PM Gail Badner <gbadner at redhat.com> wrote:
>
>> Hi,
>>
>> Given the following inheritance hierarchy:
>>
>> @Entity
>> public class Person {
>>     @Id
>>     private int id;
>>     ...
>> }
>>
>> @Entity
>> public class Employee extends Person {
>>     private String title;
>> }
>>
>> Executing a query like the following succeeds.
>>
>> "from Person where title = 'abc'"
>>
>> I thought that it would fail because Person does not have an attribute
>> named "title". Instead, the query succeeds and returns the Employee with
>> the specified title.
>>
>> I don't see anything in the JPA spec that indicates whether this is
>> portable.
>>
>> Does anyone know if this is portable?
>>
>> Thanks,
>> Gail
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>>