code: @Override
  	public UV get(UK userKey) throws IOException, RocksDBException {
  		byte[] rawKeyBytes = serializeCurrentKeyWithGroupAndNamespacePlusUserKey(userKey, userKeySerializer);
  		byte[] rawValueBytes = backend.db.get(columnFamily, rawKeyBytes);
  
  		return (rawValueBytes == null ? null : deserializeUserValue(dataInputView, rawValueBytes, userValueSerializer));
  	}
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