luocooong commented on pull request #2299:
URL: https://github.com/apache/drill/pull/2299#issuecomment-904520267
@paul-rogers Thanks for the review. I think you said number is the
`Canonical Format`? such as
```json
{"$date":{"$numberLong":"1565546054692"}}
```
I have tracked the mongo reader code, then found the mongo driver only uses
the `Relaxed Format`.
```java
// org.apache.drill.exec.store.mongo.MongoRecordReader
String doc = cursor.next().toJson();
jsonReader.setSource(doc.getBytes(Charsets.UTF_8));
// com.mongodb.internal.connection.ByteBufBsonDocument
public String toJson() {
return
toJson(JsonWriterSettings.builder().outputMode(JsonMode.RELAXED).build());
}
```
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