在我的MySQL Workbench中，以下查询完美运行：
SELECT card.number, SUM(qty)
FROM card_set, card, user_card
WHERE card_set.id = card.card_set_id
AND user_card.card_id = card.id
AND card_set.id = 1
GROUP BY card.number ORDER BY card.number;
但是，在我的Grails控制器中，我有以下内容：
SELECT card.number, SUM(qty)" +
"FROM card_set, card, user_card\n" +
"WHERE card_set.id = card.card_set_id\n" +
"AND user_card.card_id = card.id\n" +
"AND card_set.id = 1\n" +
"GROUP BY card.number ORDER BY card.number;"
输出是这样的：
[['number':1, 'SUM(qty)':2], ['number':2, 'SUM(qty)':3], ['number':3,
'SUM(qty)':0], ['number':4, 'SUM(qty)':0], ['number':5, 'SUM(qty)':-2],
['number':6, 'SUM(qty)':0], ['number':7, 'SUM(qty)':2], ['number':8,
'SUM(qty)':2], ['number':9, 'SUM(qty)':0], ['number':10, 'SUM(qty)':0],
['number':11, 'SUM(qty)':1], ['number':12, 'SUM(qty)':0], ['number':13,
'SUM(qty)':1], ['number':14, 'SUM(qty)':1], ['number':15, 'SUM(qty)':2],
['number':16, 'SUM(qty)':-1], ['number':17, 'SUM(qty)':0], ['number':18,
'SUM(qty)':0], ['number':19, 'SUM(qty)':1], ['number':20, 'SUM(qty)':0]]
为什么Grails会推出文本＆＃34; SUM（qty）＆＃34;到地图列表？我如何格式化它呢？