in flink-connector-mongodb/src/main/java/org/apache/flink/connector/mongodb/source/reader/deserializer/MongoDeserializationSchema.java [57:62]
default void deserialize(BsonDocument document, Collector<T> out) throws IOException {
T deserialize = deserialize(document);
if (deserialize != null) {
out.collect(deserialize);
}
}