For the form types I needed a one dimensional array. And as I think I will use it more often I added this to doctrine as a Hydrator.
The "Column"-Hydrator class:
namespace .... Doctrine\Hydrator;
use Doctrine\ORM\Internal\Hydration\AbstractHydrator, PDO;
class ColumnHydrator extends AbstractHy...RUNALYZE
Runalyze analysiert dein komplettes Training, berechnet deine Form, stellt Prognosen auf und stellt die Daten so da, wie du sie brauchst.