This method exposes an API endpoint to
        get the schema access control settings for csv upload in this database

def schemas_access_for_csv_upload(self):
        """
        This method exposes an API endpoint to
        get the schema access control settings for csv upload in this database
        """
        if not request.args.get('db_id'):
            return json_error_response(
                'No database is allowed for your csv upload')

        db_id = int(request.args.get('db_id'))
        database = (
            db.session
            .query(models.Database)
            .filter_by(id=db_id)
            .one()
        )
        try:
            schemas_allowed = database.get_schema_access_for_csv_upload()
            if (security_manager.database_access(database) or
                    security_manager.all_datasource_access()):
                return self.json_response(schemas_allowed)
            # the list schemas_allowed should not be empty here
            # and the list schemas_allowed_processed returned from security_manager
            # should not be empty either,
            # otherwise the database should have been filtered out
            # in CsvToDatabaseForm
            schemas_allowed_processed = security_manager.schemas_accessible_by_user(
                database, schemas_allowed, False)
            return self.json_response(schemas_allowed_processed)
        except Exception:
            return json_error_response((
                'Failed to fetch schemas allowed for csv upload in this database! '
                'Please contact Superset Admin!\n\n'
                'The error message returned was:\n{}').format(traceback.format_exc()))