driver/connector.go
func (c *Connector) SetFetchSize(fetchSize int) error {
	c.mu.Lock()
	defer c.mu.Unlock()
	if fetchSize < minFetchSize {
		fetchSize = minFetchSize
	}
	c.fetchSize = fetchSize
	return nil
}
func (c *Connector) SetFetchSize(fetchSize int) error {
	c.mu.Lock()
	defer c.mu.Unlock()
	if fetchSize < minFetchSize {
		fetchSize = minFetchSize
	}
	c.fetchSize = fetchSize
	return nil
}
/*
SetFetchSize sets the fetchSize of the connector.

For more information please see DSNFetchSize.
*/