code: func (c *Connector) SetFetchSize(fetchSize int) error {
  	c.mu.Lock()
  	defer c.mu.Unlock()
  	if fetchSize < minFetchSize {
  		fetchSize = minFetchSize
  	}
  	c.fetchSize = fetchSize
  	return nil
  }
docs: /*
  SetFetchSize sets the fetchSize of the connector.
  
  For more information please see DSNFetchSize.
  */