Correct resolve DQL alias in context in SelectEntity

[peter-gribanov]

The path to the additional alias is specified without taking into account the root alias, and as a result, Doctrine does not know how to build joins.

Example

echo $rep->getQueryBuilder(Spec::addSelect(
    Spec::selectEntity('contestant.user'),
    Spec::selectEntity('contestant'),
))->getDQL();

Result

SELECT
    root,
    contestant.user,
    contestant
FROM
    Questionnaire root

Should be

SELECT
    root,
    user,
    contestant
FROM
    Questionnaire root
INNER JOIN
    root.contestant contestant
INNER JOIN
    contestant.user user