sqlalchemy: TypeError: cannot create weak reference to 'pyodbc.Cursor' object

[jomasti]

Describe your environment
See the repo provided below for a simple reproduction environment. I was using Python 3.8.8 when running it locally.

Steps to reproduce
Provided a reproduction repo: https://github.com/jomasti/opentelemetry-instrumentation-sqlalchemy-pyodbc-bug

What is the expected behavior?
I expected the query to work successfully when the engine is instrumented. The code in the repo above works fine with 0.18b1.

What is the actual behavior?
Ran into TypeError: cannot create weak reference to 'pyodbc.Cursor' object.

Additional context
#315 appears to be the culprit.

[ewolz3]

For reference, I have the same error when I try to instrument SQLAlchemy used with an Oracle database.

2021-05-04T10:57:11.571-04:00 [ERR] self.data[ref(key, self._remove)] = value
2021-05-04T10:57:11.571-04:00 [ERR] TypeError: cannot create weak reference to 'cx_Oracle.Cursor' object

[github-actions]

This issue was marked stale due to lack of activity. It will be closed in 30 days.