DDC-2516: Undefined offset in ObjectHydrator while working with iterableResult

[doctrinebot]

Jira issue originally created by user johanny:

Following this documentation page http://doctrine-orm.readthedocs.org/en/2.0.x/reference/batch-processing.html#iterating-large-results-for-data-processing I tried to create a batch process on 75k entities. But an error came in the ObjectHydrator on line 511 there's an Undefined offset. Now, i just use the SimpleObjectHydrator and it solve the problem. but i'm wondering if it's a real bug or just a miss use of Doctrine.
Reproduce this error could be hard so ask if you want me to give you more informations about it.

[doctrinebot]

Comment created by @beberlei:

Can you provide more information? The stack trace of the error for example? The entity you try to process+mapping and the DQL query. The current information is not enough to reproduce this error.

[doctrinebot]

Comment created by johanny:

Hello Benjamin,

here is the Entity and with the corresponding Mapping :

    /****
     * @var string
     * @ORM\Id
     * @ORM\Column(name="id_source", type="string", length=32, nullable=false)
     */
    private $idSource;

    /****
     * @var string
     *
     * @ORM\Column(name="id_page", type="string", length=32, nullable=false)
     */
    private $idPage;

    /****
     * @var string
     *
     * @ORM\Column(name="url", type="string", length=500, nullable=true)
     */
    private $url;

    /****
     * @var float
     *
     * @ORM\Column(name="similitude", type="decimal", nullable=true)
     */
    private $similitude;

    /****
     * @var string
     *
     * @ORM\Column(name="alerte", type="string", length=512, nullable=true)
     */
    private $alerte;

The Entity have been generated by using this documentation page : http://symfony.com/doc/current/cookbook/doctrine/reverse_engineering.html

In this project I work with 2 databases, and one of it already exist.

Working with symfony I use the DQL Query obtain with those methods :

    public function getAllUrl($limit)
    {
        $queryBuilder = $this->createQueryBuilder('s');

        $this->setStatsParameters($queryBuilder);

        $queryBuilder->setMaxResults($limit);

        return $queryBuilder->getQuery()
                            ->iterate();
    }

    private function setStatsParameters(\Doctrine\ORM\QueryBuilder $queryBuilder)
    {
        $queryBuilder->where('s.similitude > 1')
                     ->andWhere('s.url NOT LIKE :url')
                     ->setParameter('url', 'some_string%');
    }

And here is the stack trace, when the eror comes :

Exception trace:
 () at \path\to\project\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\ObjectHydrator.php:511
 Symfony\Component\Debug\ErrorHandler->handle() at \path\to\project\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\ObjectHydrator.php:511
 Doctrine\ORM\Internal\Hydration\ObjectHydrator->hydrateRowData() at \path\to\project\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\AbstractHydrator.php:136
 Doctrine\ORM\Internal\Hydration\AbstractHydrator->hydrateRow() at \path\to\project\vendor\doctrine\orm\lib\Doctrine\ORM\Internal\Hydration\IterableResult.php:76
 Doctrine\ORM\Internal\Hydration\IterableResult->next() at \path\to\project\src\Compilatio\RecolteurBundle\Command\RecolteurCommand.php:42
 CompanyName\RecolteurBundle\Command\RecolteurCommand->execute() at \path\to\project\vendor\symfony\symfony\src\Symfony\Component\Console\Command\Command.php:244
 Symfony\Component\Console\Command\Command->run() at \path\to\project\vendor\symfony\symfony\src\Symfony\Component\Console\Application.php:906
 Symfony\Component\Console\Application->doRunCommand() at \path\to\project\vendor\symfony\symfony\src\Symfony\Component\Console\Application.php:191
 Symfony\Component\Console\Application->doRun() at \path\to\project\vendor\symfony\symfony\src\Symfony\Bundle\FrameworkBundle\Console\Application.php:80
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at \path\to\project\vendor\symfony\symfony\src\Symfony\Component\Console\Application.php:121
 Symfony\Component\Console\Application->run() at \path\to\project\app\console:27

You can also see here the source code that lead to this error :

  $sources = $urlLoader->getAllSources(50000);

  $number = 0;
  while (($source = $sources->next()) !== false) {
      $number<ins></ins>;
  }
  echo 'Nombre de sources : ' . $number;

There are all the information you ask, if you need more just tell me. For now i can see how to be more specific. Remember that if I switch the hydrator to Query::HYDRATE_SIMPLEOBJECT it solve the bug.

I hope all of this will help.

Regards,

Johanny

[beberlei]

Closing in favor of #7496