code: func (mvcc *MVCCLevelDB) RawBatchGet(keys [][]byte) [][]byte {
  	mvcc.mu.Lock()
  	defer mvcc.mu.Unlock()
  
  	values := make([][]byte, 0, len(keys))
  	for _, key := range keys {
  		value, err := mvcc.db.Get(key, nil)
  		terror.Log(err)
  		values = append(values, value)
  	}
  	return values
  }
docs: // RawBatchGet implements the RawKV interface.