presto-orc/src/main/java/io/prestosql/orc/reader/DecimalColumnReader.java/DecimalColumnReader/seekToOffset
class DecimalColumnReader:    private void seekToOffset()
            throws IOException
    {
        if (readOffset > 0) {
            if (presentStream != null) {
                // skip ahead the present bit reader, but count the set bits
                // and use this as the skip size for the data reader
                readOffset = presentStream.countBitsSet(readOffset);
            }
            if (readOffset > 0) {
                checkDataStreamsArePresent();
                verifyNotNull(decimalStream);
                verifyNotNull(scaleStream);

                decimalStream.skip(readOffset);
                scaleStream.skip(readOffset);
            }
        }
    }