composer.airflow_1_samples.hadoop_tutorial_test: test_dag_import failed

[flaky-bot]

Note: #7050 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: 84d2376
buildURL: Build Status, Sponge
status: failed

Test output

Traceback (most recent call last):
  File "/workspace/composer/airflow_1_samples/conftest.py", line 36, in airflow_database
    airflow.utils.db.resetdb(rbac=None)  # this command will change in Airflow 2.0
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/airflow/utils/db.py", line 402, in resetdb
    from alembic.migration import MigrationContext
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/__init__.py", line 3, in 
    from . import context
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/context.py", line 1, in 
    from .runtime.environment import EnvironmentContext
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/runtime/environment.py", line 15, in 
    from .migration import _ProxyTransaction
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/runtime/migration.py", line 29, in 
    from .. import ddl
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/ddl/__init__.py", line 1, in 
    from . import mssql
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/ddl/mssql.py", line 17, in 
    from .base import AddColumn
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/ddl/base.py", line 16, in 
    from ..util.sqla_compat import _columns_for_constraint  # noqa
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/util/__init__.py", line 16, in 
    from .messaging import err
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/util/messaging.py", line 16, in 
    from . import sqla_compat
  File "/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/alembic/util/sqla_compat.py", line 30, in 
    from sqlalchemy.sql.naming import _NONE_NAME as _NONE_NAME
ImportError: cannot import name '_NONE_NAME' from 'sqlalchemy.sql.naming' (/workspace/composer/airflow_1_samples/.nox/py-3-7/lib/python3.7/site-packages/sqlalchemy/sql/naming.py)