def tablespace_sql(self, tablespace, inline=False):
        return ''
validate config by metadata self section.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseOperations.tablespace_sql--crossover with--dataset/ETHPy150Open openstack/compass-core/compass/db/api/metadata_holder.py/_validate_self