Ada Date ETL produces numerical, not categorical data

fractalis/data/etlhandler.py

@@ -28,7 +28,6 @@ class ETLHandler(metaclass=abc.ABCMeta):
         """
         pass
 
-    @abc.abstractmethod
     def _get_token_for_credentials(self, server: str,
                                    user: str, passwd: str) -> str:
         """ Authenticate with the server and return a token.
@@ -37,7 +36,7 @@ class ETLHandler(metaclass=abc.ABCMeta):
         :param user: The user id.
         :param passwd: The password.
         """
-        pass
+        raise NotImplementedError()
 
     def __init__(self, server, auth):
         self._server = server

fractalis/data/etls/ada/etl_date.py

@@ -12,7 +12,7 @@ class DateETL(ETL):
     name = 'ada_date_etl'
     _handler = 'ada'
     _accepts = 'Date'
-    produces = 'categorical'
+    produces = 'numerical'
 
     def extract(self, server: str,
                 token: str, descriptor: dict) -> dict: