vendor/doctrine/orm/lib/Doctrine/ORM/Query/SqlWalker.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ORM\Query;

use Doctrine\DBAL\LockMode;
use Doctrine\DBAL\Types\Type;
use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\ORM\Query;
use Doctrine\ORM\Query\QueryException;
use Doctrine\ORM\OptimisticLockException;
use Doctrine\ORM\Mapping\ClassMetadataInfo;

/**
 * The SqlWalker is a TreeWalker that walks over a DQL AST and constructs
 * the corresponding SQL.
 *
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Roman Borschel <roman@code-factory.org>
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @author Alexander <iam.asm89@gmail.com>
 * @author Fabio B. Silva <fabio.bat.silva@gmail.com>
 * @since  2.0
 * @todo Rename: SQLWalker
 */
class SqlWalker implements TreeWalker
{
    /**
     * @var string
     */
    const HINT_DISTINCT = 'doctrine.distinct';

    /**
     * @var ResultSetMapping
     */
    private $rsm;

    /**
     * Counter for generating unique column aliases.
     *
     * @var integer
     */
    private $aliasCounter = 0;