I did not take the attribute `empty_fetchmany_value = ()` which results in
blocking on fetchmany()
For example, this is where we "hang" in that case (just including the pertinent part
of the traceback)::
File "/usr/local/lib/python2.6/site-packages/django/db/models/sql/query.py", line 2383, in <lambda>
result = iter((lambda: cursor.fetchmany(GET_ITERATOR_CHUNK_SIZE)),
File "/usr/local/lib/python2.6/site-packages/mysql/connector/cursor.py", line 492, in fetchmany
while cnt > 0 and self._have_result: