Looking for AbstractQueryImpl

We are trying to upgrade hibernate version from 3.4.x to 5.4.29 Final. I’m looking for AbstractQueryImpl class. But it seems that class is missing and there is nothing in migration guide.
is this class has been deleted, moved or renamed?

thanks for your help.

As the name suffix Impl and also the package in which the class was located suggests, this is an implementation detail that you shouldn’t rely on. If you do, you are on your own and have to figure this out by yourself. Only user facing API changes are described in the migration guides.