vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/SingleTablePersister.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\Persisters;

use Doctrine\ORM\Mapping\ClassMetadata;
use Doctrine\Common\Collections\Criteria;

/**
 * Persister for entities that participate in a hierarchy mapped with the
 * SINGLE_TABLE strategy.
 *
 * @author Roman Borschel <roman@code-factory.org>
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @author Alexander <iam.asm89@gmail.com>
 * @since 2.0
 * @link http://martinfowler.com/eaaCatalog/singleTableInheritance.html
 */
class SingleTablePersister extends AbstractEntityInheritancePersister
{
    /**
     * {@inheritdoc}
     */
    protected function getDiscriminatorColumnTableName()
    {
        return $this->class->getTableName();
    }

    /**
     * {@inheritdoc} 
     */
    protected function getSelectColumnsSQL()
    {
        if ($this->selectColumnListSql !== null) {
            return $this->selectColumnListSql;
        }

        $columnList[] = parent::getSelectColumnsSQL();

        $rootClass  = $this->em->getClassMetadata($this->class->rootEntityName);
        $tableAlias = $this->getSQLTableAlias($rootClass->name);

         // Append discriminator column
        $discrColumn    = $this->class->discriminatorColumn['name'];