Added transcoders for interleaved LevelDB backend.

common/coords.go

@@ -161,6 +161,22 @@ func IdentityTranscoder(key []byte) ([]byte, error) {
 	return key, nil
 }
 
+func TranscodePlainToInterleaved(key []byte) ([]byte, error) {
+	if pos, err := DecodeStringFromBytesToInterleaved(key); err != nil {
+		return nil, err
+	} else {
+		return EncodeToBigEndian(pos)
+	}
+}
+
+func TranscodeInterleavedToPlain(key []byte) ([]byte, error) {
+	if pos, err := DecodeFromBigEndian(key); err != nil {
+		return nil, err
+	} else {
+		return EncodeStringToBytes(TransformInterleavedToPlain(pos))
+	}
+}
+
 func SelectKeySplitter(interleaved bool) KeySplitter {
 	if interleaved {
 		return InterleavedToCoord