code: func updateStatement(cfName string, fields []string /*, opts Options*/) (statement string) {
  	buf := new(bytes.Buffer)
  	buf.WriteString(fmt.Sprintf("UPDATE %s ", cfName))
  
  	/*
  		// Apply options
  		if opts.TTL != 0 {
  			buf.WriteString("USING TTL ")
  			buf.WriteString(strconv.FormatFloat(opts.TTL.Seconds(), 'f', 0, 64))
  			buf.WriteRune(' ')
  		}*/
  
  	buf.WriteString("SET ")
  	first := true
  	for _, fieldName := range fields {
  		if !first {
  			buf.WriteString(", ")
  		} else {
  			first = false
  		}
  		buf.WriteString(fieldName)
  		buf.WriteString(` = ?`)
  	}
  
  	return buf.String()
  }
docs: // UPDATE keyspace.Movies SET col1 = val1, col2 = val2