presto-orc/src/main/java/io/prestosql/orc/AbstractOrcDataSource.java/AbstractOrcDataSource/read
class AbstractOrcDataSource:        @Override
        public void read(long position, byte[] buffer, int bufferOffset, int length)
                throws IOException
        {
            readFully(diskRange.getOffset() + position, buffer, bufferOffset, length);
        }