## Description of proposed changes

## Related issue(s)

Fixes # (issue)

## Test plan

## Checklist

Need help on these? Just ask!

* [ ] I have read the **CONTRIBUTING** document.
* [ ] I have updated the documentation accordingly.
* [ ] I have added tests to cover my changes.
* [ ] I have run `tox -e complex` and/or `tox -e spark` if appropriate.
* [ ] All new and existing tests passed.
