lithium\data\source\database\adapter\PostgreSql::_distinctExport PHP Method

    protected function _distinctExport($query)
    {
        $model = $query->model();
        $orders = $query->order();
        $result = array('fields' => array(), 'orders' => array());
        if (is_string($orders)) {
            $direction = 'ASC';
            if (preg_match('/^(.*?)\\s+((?:A|DE)SC)$/i', $orders, $match)) {
                $orders = $match[1];
                $direction = $match[2];
            }
            $orders = array($orders => $direction);
        }
        if (!is_array($orders)) {
            return array_values($result);
        }
        foreach ($orders as $column => $dir) {
            if (is_int($column)) {
                $column = $dir;
                $dir = 'ASC';
            }
            if ($model && $model::schema($column)) {
                $name = $this->name($query->alias()) . '.' . $this->name($column);
                $alias = $this->name('_' . $query->alias() . '_' . $column . '_');
            } else {
                list($alias, $field) = $this->_splitFieldname($column);
                $name = $this->name($column);
                $alias = $this->name('_' . $alias . '_' . $field . '_');
            }
            $result['fields'][] = "{$name} AS {$alias}";
            $result['orders'][] = "{$alias} {$dir}";
        }
        return array_values($result);
    }