code: func (mvcc *MVCCLevelDB) RawBatchDelete(keys [][]byte) {
  	mvcc.mu.Lock()
  	defer mvcc.mu.Unlock()
  
  	batch := &leveldb.Batch{}
  	for _, key := range keys {
  		batch.Delete(key)
  	}
  	terror.Log(mvcc.db.Write(batch, nil))
  }
docs: // RawBatchDelete implements the RawKV interface.