jpql genere 2 sql au lieu de 1

bonjour
un object issue contient un object event.
Je voudrait la liste des issues d'un event , je fait donc la requeste suivante:

Code:

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select issue from Issue issue inner join fetch issue.event where issue.event.id=" + event.getId() + " order by issue.id"

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Mais cela genere 2 sql:
(j'ai remplacé les nombreux champs par ...)

Code:

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1 2	SELECT t1.id_issue, t1.fl_completed, ..., t0.id_event_pk, t0.dt_start_date, ... FROM sdcarbrp.dbo.t_car_events t0, sdcarbrp.dbo.t_car_issues t1 WHERE ((t0.id_event_pk = ?) AND (t0.id_event_pk = t1.id_event_pk)) ORDER BY t1.id_issue ASC bind => [1978]

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et

Code:

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1 2	SELECT id_issue, fl_completed,... FROM sdcarbrp.dbo.t_car_issues WHERE (id_event_pk = ?) bind => [1978]

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Pourquoi genere t-il 2 requetes sql pour une requete jpql ?

Merci