Minor Description
Current MD5 UDF implementation uses Apache Commons DigestUtils.md5Hex method to get md5 hex.
DigestUtils does not provide md5Hex method with signature (byte[], start, length). This is why copyBytes method was added to UDFMd5 to get bytes[] from BytesWritable.
To avoid copying bytes from BytesWritable to new byte array we can use java MessageDigest API directly.
MessageDigest has method update(byte[], start, length)
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