<input name="field_extra[<?php echo $columnNumber; ?>]"
       id="field_<?php echo $columnNumber?>_<?php echo ($ci - $ci_offset); ?>"
       <?php if (isset($columnMeta['Extra'])
                    && /*overload*/mb_strtolower($columnMeta['Extra']) == 'auto_increment'): ?>
           checked="checked"
       <?php endif; ?>
       type="checkbox"
       value="AUTO_INCREMENT" />