presto-rcfile/src/main/java/io/prestosql/rcfile/binary/DecimalEncoding.java/DecimalEncoding/decodeValueInto
class DecimalEncoding:    @Override
    public void decodeValueInto(BlockBuilder builder, Slice slice, int offset, int length)
    {
        if (isShortDecimal(type)) {
            type.writeLong(builder, parseLong(slice, offset));
        }
        else {
            type.writeSlice(builder, parseSlice(slice, offset));
        }
    }