func (c *Iterator) NextRecord() (pilosa.Record, error) {
	if ok := c.scanner.Scan(); ok {
		c.line++
		text := strings.TrimSpace(c.scanner.Text())
		if text != "" {
			rc, err := c.unmarshaller(text)
			if err != nil {
				return nil, fmt.Errorf("%s at line: %d", err.Error(), c.line)
			}
			return rc, nil
		}
	}
	err := c.scanner.Err()
	if err != nil {
		return nil, err
	}
	return nil, io.EOF
}
func (c *Iterator) NextRecord() (pilosa.Record, error) {
	if ok := c.scanner.Scan(); ok {
		c.line++
		text := strings.TrimSpace(c.scanner.Text())
		if text != "" {
			rc, err := c.unmarshaller(text)
			if err != nil {
				return nil, fmt.Errorf("%s at line: %d", err.Error(), c.line)
			}
			return rc, nil
		}
	}
	err := c.scanner.Err()
	if err != nil {
		return nil, err
	}
	return nil, io.EOF
}
// NextRecord iterates on lines of a Reader.
// Returns io.EOF on end of iteration.