presto-rcfile/src/main/java/io/prestosql/rcfile/RcFileReader.java/RcFileReader/load
class RcFileReader:        @Override
        public void load(long position, ByteArrayBufferReference bufferReference, int length)
        {
            try {
                dataSource.readFully(position, bufferReference.getByteBuffer(), 0, length);
            }
            catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }