Incubator-superset: Error on Delete. sqlalchemy.exc.ResourceClosedError: This transaction is closed

[nomulex]

I used the official superset helm charts here to install superset. But I get an error on save.

Expected results

Superset to save results with no error.

Actual results

`ERROR:flask_appbuilder.models.sqla.interface:Delete record error: This transaction is closed
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2597, in _flush
flush_context.execute()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 422, in execute
rec.execute(self)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 624, in execute
uow,
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 326, in delete_obj
_organize_states_for_delete(base_mapper, states, uowtransaction)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 463, in _organize_states_for_delete
base_mapper, uowtransaction, states
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 1602, in _connections_for_states
connection = uowtransaction.transaction.connection(base_mapper)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 311, in connection
self._assert_active()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 304, in _assert_active
raise sa_exc.ResourceClosedError(closed_msg)
sqlalchemy.exc.ResourceClosedError: This transaction is closed

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/flask_appbuilder/models/sqla/interface.py", line 634, in delete
self.session.commit()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/scoping.py", line 162, in do
return getattr(self.registry(), name)(args, *kwargs)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 1036, in commit
self.transaction.commit()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 503, in commit
self._prepare_impl()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 482, in _prepare_impl
self.session.flush()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2496, in flush
self._flush(objects)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2637, in _flush
transaction.rollback(_capture_exception=True)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 81, in __exit__
compat.raise_(value, with_traceback=traceback)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 178, in raise_
raise exception
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2637, in _flush
transaction.rollback(_capture_exception=True)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 519, in rollback
self._assert_active(prepared_ok=True, rollback_ok=True)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 304, in _assert_active
raise sa_exc.ResourceClosedError(closed_msg)
sqlalchemy.exc.ResourceClosedError: This transaction is closed
`

Screenshots

Environment

(please complete the following information):

• superset version: superset version Superset 0.999.0dev
• python version: python --version Python 3.6.9
• node.js version: node -v none in this container
• npm version: npm -v none in this container

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

• [x] I have checked the superset logs for python stacktraces and included it here as text if there are any.
• [x] I have reproduced the issue with at least the latest released version of superset.
• [x] I have checked the issue tracker for the same issue and I haven't found one similar.

Additional context

none.

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[dpgaspar]

Could you please fill out a detailed description of the steps to reproduce this issue, also add a chunk of log prior to the error itself.

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