#NEWLINE# def get_expression_column( self , evaluator ) : #NEWLINE# #INDENT# '\n        Helper method to return the quoted column string from the evaluator\n        for its expression.\n        ' #NEWLINE# for ( expr , col_tup ) in evaluator . cols : #NEWLINE# #INDENT# if ( expr is expr . expression ) : #NEWLINE# #INDENT# return ( '%s.%s' % tuple ( map ( self . quote_name , col_tup ) ) ) #NEWLINE# #UNINDENT# #UNINDENT# raise Exception ( 'Could not find the column for the expression.' )