I am implementing the joins on GAE, and I realized that you should be
able to perform joins between DAL databases whether it is the same
driver or not.

fsdb = FSDB(...,name='fsdb')
gaedb = GAEDB(...,name='gaedb')

rows = ((gaedb.users.name=='bob')&
(gaedb.users.id==fsdb.users.id)).select(fsdb.users.data)

rows[0].fsdb.users.data

This should would work for FSDB, DICTDB, and also any API  that can be
abstracted as a DAL (eg. MEMDB, ...).

Robin
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