code: def at_least_one_schema_is_allowed(database):
          
          if (security_manager.database_access(database) or
                  security_manager.all_datasource_access()):
              return True
          schemas = database.get_schema_access_for_csv_upload()
          if (schemas and
              security_manager.schemas_accessible_by_user(
                  database, schemas, False)):
              return True
          return False
docs: If the user has access to the database or all datasource
              1. if schemas_allowed_for_csv_upload is empty
                  a) if database does not support schema
                      user is able to upload csv without specifying schema name
                  b) if database supports schema
                      user is able to upload csv to any schema
              2. if schemas_allowed_for_csv_upload is not empty
                  a) if database does not support schema
                      This situation is impossible and upload will fail
                  b) if database supports schema
                      user is able to upload to schema in schemas_allowed_for_csv_upload
          elif the user does not access to the database or all datasource
              1. if schemas_allowed_for_csv_upload is empty
                  a) if database does not support schema
                      user is unable to upload csv
                  b) if database supports schema
                      user is unable to upload csv
              2. if schemas_allowed_for_csv_upload is not empty
                  a) if database does not support schema
                      This situation is impossible and user is unable to upload csv
                  b) if database supports schema
                      user is able to upload to schema in schemas_allowed_for_csv_upload