system/classes/Db_MySQL.php
protected function getSetItem($dataMember, $offset, $quote = true)
    {
        $item = $this->{$dataMember}[$offset];
        switch ($item[1]) {
            case 'varchar':
                $type = 'varchar(255)';
                break;
            default:
                $type = $item[1];
        }
        $this->{$dataMember}[$offset][1] = $type;
        
        return $this->getArrayItem($dataMember, $offset, $quote);
    }
protected function getSetItem($dataMember, $offset, $quote = true)
    {
        $item = $this->{$dataMember}[$offset];
        switch ($item[1]) {
            case 'varchar':
                $type = 'varchar(255)';
                break;
            default:
                $type = $item[1];
        }
        $this->{$dataMember}[$offset][1] = $type;
        
        return $this->getArrayItem($dataMember, $offset, $quote);
    }
Converts field types to real values that match this adaptor's DB type.