code: func (s *CommonStorageDB) GetCachedKeyHashVersion(namespace, collection string, keyHash []byte) (*version.Height, bool) {
  	bulkOptimizable, ok := s.VersionedDB.(statedb.BulkOptimizable)
  	if !ok {
  		return nil, false
  	}
  
  	keyHashStr := string(keyHash)
  	if !s.BytesKeySupported() {
  		keyHashStr = base64.StdEncoding.EncodeToString(keyHash)
  	}
  	return bulkOptimizable.GetCachedVersion(deriveHashedDataNs(namespace, collection), keyHashStr)
  }
docs: // GetCachedKeyHashVersion retrieves the keyhash version from cache