Eclipselink的子类的fetch-join惰性关联

Question

I want to fetch a lazy association, which is present on a subclass only. In Hibernate, it is possible to use fetch treat joins, for example

select a from A a left join fetch treat(a.parent as Child) u left join fetch child.some

Where child.some is an association which is present on Child entity only.

But we use ver 2.6.3. AFAIK JPA doesn't cover this problem, fetch treat is not supported by Eclipse. I have already tried eclipse fetch hints with no success.

Thanks in advance

Answer 1

This is not supported in EclipseLink by default (I believe it is a bug). But there is working workaround in Joiner library ( InheritanceJoiningCustomizer in https://github.com/encircled/Joiner )