Criteria is incorrectly serializing values on array field

[hubertnnn]

Bug Report

Q	A
BC Break	no
Version	2.6.3

Summary

When trying to use Criteria on array type of field, the value is incorrectly serialized.

Field definition:

    /**
     * @ORM\Column(name="roles", type="array")
     */
    private $roles = [];

Criteria usage:

        $criteria = new Criteria();
        $criteria->where($criteria->expr()->contains('roles', 'ROLE_ADMIN'));

        $em = $this->container->get('doctrine')->getManager();
        $data = $em->getRepository(User::class)->matching($criteria);
        foreach ($data as $row) {
            $row->getRoles(); // Force LAZY_LOAD
        }

Current behavior

Generated SQL contains following where clause:
WHERE t0.roles LIKE 's:12:\"%ROLE_ADMIN%\";'

Expected behavior

Where statement should not be serialized:
WHERE t0.roles LIKE '%ROLE_ADMIN%'
or should be serialized before adding percent signs:
WHERE t0.roles LIKE '%s:10:\"ROLE_ADMIN\";%'

[Ocramius]

Hmm, seems correct behavior, since the conversion goes through SQL conversions in the DBAL type.

The problem is that it certainly isn't obvious to the consumer, but do imagine doing the same with a DateTime instance: a conversion would most certainly be expected.

EDIT: sorry, didn't mean to close