code: func (t *TxStructure) Get(key []byte) ([]byte, error) {
  	ek := t.encodeStringDataKey(key)
  	value, err := t.reader.Get(ek)
  	if kv.ErrNotExist.Equal(err) {
  		err = nil
  	}
  	return value, errors.Trace(err)
  }
docs: // Get gets the string value of a key.