org.hibernate.query.criteria level, even though JPA does
not define support for insert-select criteria.
API Note
Incubating mainly for 2 purposes:
<T> or <X>. For the time being we expose it as
<T> because that is what was done (without intention) originally,
and it is the easiest form to validate
org.hibernate.query.sqm.tree.insert.SqmInsertSelectStatement