The unsupported JPA features are:
* Owned many-to-many relationships, and unowned relationships. You
can implement unowned relationships using explicit Key values, though
type checking is not enforced in the API.
* "Join" queries. You cannot use a field of a child entity in a
filter when performing a query on the parent kind. Note that you can
test the parent's relationship field directly in query using a key.
* Aggregation queries (group by, having, sum, avg, max, min)
* Polymorphic queries. You cannot perform a query of a class to
get instances of a subclass. Each class is represented by a separate
entity kind in the datastore.
I wonder if any (or all) of them will be supported.
Thank you.
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