vendor/doctrine/orm/lib/Doctrine/ORM/Tools/Pagination/LimitSubqueryWalker.php

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<?php

/**
 * Doctrine ORM
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE. This license can also be viewed
 * at http://hobodave.com/license.txt
 *
 * @category    DoctrineExtensions
 * @package     DoctrineExtensions\Paginate
 * @author      David Abdemoulaie <dave@hobodave.com>
 * @copyright   Copyright (c) 2010 David Abdemoulaie (http://hobodave.com/)
 * @license     http://hobodave.com/license.txt New BSD License
 */

namespace Doctrine\ORM\Tools\Pagination;

use Doctrine\DBAL\Types\Type;
use Doctrine\ORM\Query\TreeWalkerAdapter;
use Doctrine\ORM\Query\AST\SelectStatement;
use Doctrine\ORM\Query\AST\SelectExpression;
use Doctrine\ORM\Query\AST\PathExpression;

/**
 * Replaces the selectClause of the AST with a SELECT DISTINCT root.id equivalent.
 *
 * @category    DoctrineExtensions
 * @package     DoctrineExtensions\Paginate
 * @author      David Abdemoulaie <dave@hobodave.com>
 * @copyright   Copyright (c) 2010 David Abdemoulaie (http://hobodave.com/)
 * @license     http://hobodave.com/license.txt New BSD License
 */
class LimitSubqueryWalker extends TreeWalkerAdapter
{
    /**
     * ID type hint.
     */
    const IDENTIFIER_TYPE = 'doctrine_paginator.id.type';

    /**
     * Counter for generating unique order column aliases.
     *
     * @var int
     */
    private $_aliasCounter = 0;

    /**
     * Walks down a SelectStatement AST node, modifying it to retrieve DISTINCT ids
     * of the root Entity.
     *
     * @param SelectStatement $AST
     *
     * @return void
     *
     * @throws \RuntimeException
     */
    public function walkSelectStatement(SelectStatement $AST)