Sets the hierarchy lookup for the inputed table type and column.
        
        :param      columnName | <str>
                    tableType  | <subclass of Table>

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)