What does the error "AttributeError: type object 'String' has no attribute 'RETURNS_CONDITIONAL'" mean when importing ibm_db_sa?

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The error "AttributeError: type object 'String' has no attribute 'RETURNSCONDITIONAL'" occurs when trying to use the ibmdbsa package because it is not compatible with the version of SQLAlchemy being used. The ibmdbsa package is designed to work with SQLAlchemy version 0.7.x, but if you are using a different version of SQLAlchemy, the package may not work properly and may produce this error. To fix the issue, you can try updating SQLAlchemy to the correct version or using a version of ibmdb_sa that is compatible with your current version of SQLAlchemy.