def __init__(self, k_range, query_spec):
    self._key_range = k_range
    self._query_spec = query_spec
    self._cursor = None
    self._query = None
Returns the list of ordering fields for the change list.
dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/src/mapreduce/datastore_range_iterators.py/AbstractKeyRangeIterator.__init__--crossover with--dataset/ETHPy150Open torchbox/wagtail/wagtail/contrib/modeladmin/views.py/IndexView.get_ordering