(self)
return list(tz.unique(tz.concat(
            m.columns_used() for m in self.models.values())))
Returns all the columns used across all models in the group
        for filtering and in the model expression.
Returns all the columns used across all models in the group
        for filtering and in the model expression.
Returns all the columns used across all models in the group for filtering and in the model expression .
def columns_used(self):
        """
        Returns all the columns used across all models in the group
        for filtering and in the model expression.

        """
        return list(tz.unique(tz.concat(
            m.columns_used() for m in self.models.values())))
def columns_used ( self ) : return list ( tz . unique ( tz . concat ( m . columns_used ( ) for m in self . models . values ( ) ) ) )