LambdaQueryWrapper select 方法无法传入 字符串

QueryWrapper select 传入 字段列表 转成 LambdaQueryWrapper
new QueryWrapper< Detail >().select("DISTINCT `day`").lambda()
                .eq(Detail::getUserId, userId).eq(Detail::getMonth, month)


SELECT DISTINCT `day` FROM detail WHERE user_id = ? AND month = ? 



new QueryWrapper< Detail>().select("sum(skipping_duration) totalDuration", "count(1) totalTimes")
                .lambda().eq(Detail::getUserId, userId)

SELECT sum(skipping_duration) totalDuration,count(1) totalTimes FROM detail WHERE user_id = ? 



new QueryWrapper< OrderModel>()
	.select(" SUM(fee_amt) AS fee_amt, SUM(arrival_amt) AS arrival_amt, mer_no ")
	.lambda()