def deferred_to_columns(self):
        columns = {}
        self.query.deferred_to_data(columns, self.query.deferred_to_columns_cb)
        return columns
Connect to the MBTiles file which is just an sqlite file.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/models/sql/compiler.py/SQLCompiler.deferred_to_columns--crossover with--dataset/ETHPy150Open MinnPost/mbtiles2s3/mbtiles2s3/mbtiles2s3.py/MBTiles2S3.connect_mbtiles