def pre_execute(self, context):
        pass
Creates the SQL for this query. Returns the SQL string and list of
dataset/ETHPy150Open airbnb/airflow/airflow/models.py/BaseOperator.pre_execute--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/models/sql/compiler.py/SQLUpdateCompiler.as_sql