如何使用MyBatis实现查询并返回map类型结果？

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java// DAO层返回结果为Listpublic List queryItemSaleCountBatch() { return selectList(selectByField);}

// MyBatis片段select t.item_id as itemId, sum(t.quantity) as saleNumfrom order twhere t.order_status=1group by t.item

//DAO层返回的结果为list public List > queryItemSaleCountBatch() { return selectList("selectByField"); } //mybatis片段 select t.item_id as itemId, sum(t.`quantity`) as saleNum from order t where t.order_status = 1 group by t.item_id