vendor/doctrine/orm/lib/Doctrine/ORM/Tools/Pagination/LimitSubqueryOutputWalker.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.txt.
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to kontakt@beberlei.de so I can send you a copy immediately.
 */

namespace Doctrine\ORM\Tools\Pagination;

use Doctrine\ORM\Query\AST\PathExpression;
use Doctrine\ORM\Query\SqlWalker;
use Doctrine\ORM\Query\AST\SelectStatement;
use Doctrine\DBAL\Platforms\PostgreSqlPlatform;
use Doctrine\DBAL\Platforms\OraclePlatform;

/**
 * Wraps the query in order to select root entity IDs for pagination.
 *
 * Given a DQL like `SELECT u FROM User u` it will generate an SQL query like:
 * SELECT DISTINCT <id> FROM (<original SQL>) LIMIT x OFFSET y
 *
 * Works with composite keys but cannot deal with queries that have multiple
 * root entities (e.g. `SELECT f, b from Foo, Bar`)
 *
 * @author Sander Marechal <s.marechal@jejik.com>
 */
class LimitSubqueryOutputWalker extends SqlWalker
{
    /**
     * @var \Doctrine\DBAL\Platforms\AbstractPlatform
     */
    private $platform;

    /**
     * @var \Doctrine\ORM\Query\ResultSetMapping
     */
    private $rsm;

    /**
     * @var array
     */
    private $queryComponents;

    /**
     * @var int
     */
    private $firstResult;

    /**
     * @var int
     */
    private $maxResults;

    /**