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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9862" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-357f191d-f699-4265-a5b0-cd0885e93980" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9862" style="color: #3b73af; text-decoration: none">HHH-9862</a>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-9862" style="color: #3b73af; text-decoration: none">Hibernate implementation of JPA 2.1 treat wrongly uses inner join</a> </span>
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Issue Type:
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Affects Versions:
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4.3.5
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Unassigned
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Components:
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hibernate-core
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Created:
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10/Jun/2015 19:40 PM
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Priority:
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cwong15" id="email_cwong15" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=cwong15" style="color:#6c797f;; color: #3b73af; text-decoration: none">Christopher Wong</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I use joined inheritance mapping for my tables, and found to my dismay that<br /> using the JPA 2.1 "treat" construct to downcast causes the usual left outer<br /> join to a subclass table to become an inner join. This makes the construct<br /> useless since the inner join makes polymorphic queries impossible: only the<br /> treat-ed type will be retrieved. In the case where 2 or more downcasts are<br /> made, absolutely no records can be retrieved.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Sample JPA 2.1 code:</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">CriteriaBuilder cb = entityManager.getCriteriaBuilder();<br /> CriteriaQuery<Object[]> query = cb.createQuery(Object[].class);<br /> Root<Pet> root = query.from(Pet.class);<br /> query.multiselect(<br /> root.get("id"),<br /> root.get("name"),<br /> cb.treat(root, Cat.class).get("felineProperty"),<br /> cb.treat(root, Dog.class).get("canineProperty")<br /> );</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The resulting SQL looks like (mocked up):</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">select<br /> ...<br /> from <br /> Pet pet0_<br /> left outer join<br /> Bunny bunny0_<br /> on pet0_.ID=bunny0_.ID<br /> inner join <br /> Cat cat0_<br /> on pet0_.ID=cat0_.ID<br /> inner join<br /> Dog dog0_<br /> on pet0_.ID=dog0_.ID</p>
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