Function ReverseKey

x/keys.go:223–233

ReverseKey generates a reverse key with the given attribute and UID. The structure of a reverse key is as follows: byte 0: key type prefix (set to DefaultPrefix or ByteSplit if part of a multi-part list) byte 1-2: length of attr next len(attr) bytes: value of attr next byte: data type prefix (set t

(attr string, uid uint64)

// next eight bytes (optional): if the key corresponds to a split list,
// the startUid of the split stored in this key.
func ReverseKey(attr string, uid uint64) []byte {
	extra := 1 + 8 // ByteReverse + UID
	buf, prefixLen := generateKey(DefaultPrefix, attr, extra)

	rest := buf[prefixLen:]
	rest[0] = ByteReverse

	rest = rest[1:]
	binary.BigEndian.PutUint64(rest, uid)
	return buf
}

func IndexKeyAfterAllTerms(attr string) []byte {
	// Use a term with 0xFF to ensure lexicographically after any real term