presto-orc/src/main/java/io/prestosql/orc/stream/LongOutputStreamV1.java/LongOutputStreamV1/recordCheckpoint
class LongOutputStreamV1:    @Override
    public void recordCheckpoint()
    {
        checkState(!closed);
        checkpoints.add(new LongStreamV1Checkpoint(size, buffer.getCheckpoint()));
    }