云开发的数据库操作符的setDifference的运算结果有问题
{ "_id": 1, "A": [ 1, 2 ], "B": [ 1, 2 ] }
{ "_id": 2, "A": [ 1, 2 ], "B": [ 2, 1, 2 ] }
{ "_id": 3, "A": [ 1, 2 ], "B": [ 1, 2, 3 ] }
{ "_id": 4, "A": [ 1, 2 ], "B": [ 3, 1 ] }
{ "_id": 5, "A": [ 1, 2 ], "B": [ ] }
{ "_id": 6, "A": [ 1, 2 ], "B": [ {}, [] ] }
{ "_id": 7, "A": [ ], "B": [ ] }
{ "_id": 8, "A": [ ], "B": [ 1 ] }
下面的代码使用 [代码]setDifference[代码]，找到只存在于 [代码]B[代码] 中的数字： db.collection('test')
.aggregate()
.project({
isBOnly: $.setDifference(['$B', '$A'])
})
.end()
{ "_id": 1, "isBOnly": [] } { "_id": 2, "isBOnly": [3] } { "_id": 3, "isBOnly": [3] } { "_id": 4, "isBOnly": [5] } { "_id": 5, "isBOnly": [] } { "_id": 6, "isBOnly": [{}, []] } { "_id": 7, "isBOnly": [] } { "_id": 8, "isBOnly": [1] } 测试结果和官方给出的结果不一样啊 https://developers.weixin.qq.com/miniprogram/dev/wxcloud/reference-sdk-api/database/command/aggregate/AggregateCommand.setDifference.html
