I converted some MongoDB tests into Cassandra tests, in order to verify the database mapping using a builder-style syntax for assertions.
I found out that Yes/No and True/False types were treated incorrectly, as they were stored as "true" - "false" strings, instead of using "Y" - "N", or "T" - "F".
I also fixed the issue.

Pull Request: https://github.com/hibernate/hibernate-ogm/pull/615