public function isSupported($item)
{
// MULTI_COLUMN_AS_OR_COND due to mysql bugs:
// - http://bugs.mysql.com/bug.php?id=31188
// - http://bugs.mysql.com/bug.php?id=35819
// and more.
return $item === self::SUPPORT_SELECT_UNGROUPED_COLUMNS || $item === self::SUPPORT_MULTI_COLUMN_AS_OR_COND;
}