private GenericRowData extractRowData(BsonDocument document) throws Exception {
        checkNotNull(document);
        return (GenericRowData) physicalConverter.convert(document);
    }
A wrapped output collector which is used to append metadata columns after physical columns.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/mongodb/MongoDBConnectorDeserializationSchema.java