rockagen opened a new issue, #4562:
URL: https://github.com/apache/incubator-seatunnel/issues/4562
都是国人，中文描述了，抱歉：
请问，mongodb同步时的schema，如果有个字段是map类型的，schema怎么写？如下：
```json
{
"a": "abc",
"b": 123,
"c": {
"c1": "abc",
"c2": {
"c21": "abc"
}
}
}
```
```json
{
"a": "abc",
"b": 123,
"c": {
"c2": {
"c21": "abc",
"c22": "def",
"c23": {
"d31": "abc"
}
}
}
}
```
seatunnel里的mongodb source 大概是这么写：
```config
schema {
fields {
a=string
b=int
c=HOWTO
}
}
```
这里的c请问填什么，这个我记得v2.1可以直接string，怎么到了2.3怎么就倒退了啊，怎么填都不行
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