I have a Customer with class table inheritance mapping and some fields, and a subclass called SuperCustomer with two fields: bool `isSuper` and string `extra`.
I found that when replacing the usual ArrayCache with a MemcacheCache, everything works fine on the first request, but notices occur on subsequent requests:
Notice: Undefined index: isSuper in X:\...\Doctrine\ORM\Persisters\StandardEntityPersister.php on line 577
Notice: Undefined index: extra in X:\...\Doctrine\ORM\Persisters\StandardEntityPersister.php on line 577
Inspection of ClassMetadata::$resultColumnNames on line 569 showed that the two fields `isSuper` and `extra` were (the only things) missing. The resulting object's `isSuper` and `extra` properties were empty.
I have yet to find the cause of this, but maybe you have an idea.