Doctrine_Collection toArray() does not return results of table joins.

e.g.
$doctrineCollection = Doctrine_Query::create()
->from('Table1 a')
->innerJoin('a.Table2 b ON a.id = b.id')
->execute();

$doctrineCollection->toArray() will return only the contents of Table1. However, $doctrineCollection->getFirst()->toArray() will return the results of Table1 + an additional key named 'Table2' which returns the join result from Table2.

It does not make sense for the collection hydration to differ to that of the objects in the collection.