docs: def setHierarchyLookup(self, columnName, tableType=None):
          """
          Sets the hierarchy lookup for the inputed table type and column.
          
          :param      columnName | <str>
                      tableType  | <subclass of Table>
          """
          if tableType:
              tableType = self.tableType()
          self._hierarchyLookup[tableType] = (tableType, columnName)