presto-rcfile/src/main/java/io/prestosql/rcfile/RcFileReader.java/RcFileReader/seekToFirstRowGroupInRange
class RcFileReader:    private void seekToFirstRowGroupInRange(long offset, long length)
            throws IOException
    {
        long startOfSyncSequence = findFirstSyncPosition(dataSource, offset, length, syncFirst, syncSecond);
        if (startOfSyncSequence < 0) {
            closeQuietly();
            return;
        }
        input.setPosition(startOfSyncSequence);
    }