presto-orc/src/main/java/io/prestosql/orc/stream/CheckpointInputStreamSource.java/CheckpointInputStreamSource/CheckpointInputStreamSource
class CheckpointInputStreamSource:    private CheckpointInputStreamSource(S stream, C checkpoint)
    {
        this.stream = requireNonNull(stream, "stream is null");
        this.checkpoint = requireNonNull(checkpoint, "checkpoint is null");
    }