def as_sql(self, compiler, connection):
        raise NotImplementedError("Subclasses must implement as_sql()")
Delete keys from the Cloud Datastore.
dataset/ETHPy150Open django/django/django/db/models/expressions.py/BaseExpression.as_sql--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/gcloud-python/gcloud/datastore/client.py/Client.delete_multi