presto-orc/src/main/java/io/prestosql/orc/stream/LongDecode.java/LongDecode/writeVLong
class LongDecode:    public static void writeVLong(SliceOutput buffer, long value, boolean signed)
    {
        if (signed) {
            value = zigzagEncode(value);
        }
        writeVLongUnsigned(buffer, value);
    }