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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-10577" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-84f35925-bee7-438b-9158-193061ad7cab" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10577" style="color: #3b73af; text-decoration: none">HHH-10577</a> </td>
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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-10577" style="color: #3b73af; text-decoration: none">Allow dereferencing of KEY() path</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-84f35925-bee7-438b-9158-193061ad7cab" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.1.0 </td>
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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"> key-join-example.7z </td>
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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"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 01/Mar/2016 04:51 AM </td>
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-4383147b-6ba4-4cf6-bcf2-7ec1e4fcc8e1" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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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="Mobe" id="email_Mobe" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=Mobe" style="color:#6c797f;; color: #3b73af; text-decoration: none">Moritz Becker</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">As mentioned in <a href="https://hibernate.atlassian.net/browse/HHH-10537" title="Usage of JPQL KEY() with entity key generates inner join" class="issue-link" data-issue-key="HHH-10537" style="color: #3b73af; text-decoration: none">HHH-10537</a>, The JPA spec contains examples of KEY() path dereferencing which is currently not allowed in Hibernate. This can be especially useful in cases where the map key is an entity since</p>
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<span class="code-keyword" style="color: #000091">SELECT</span> KEY(map) <span class="code-keyword" style="color: #000091">FROM</span> ...
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">would fetch the whole key but it might be desirable to select only a specific property of the key entity e.g.:</p>
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<span class="code-keyword" style="color: #000091">SELECT</span> KEY(map).name <span class="code-keyword" style="color: #000091">FROM</span> ...
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Note that the selecting <tt>KEY(map).id</tt> is a special case for optimization since there is no need for an extra join in this case - the id can be selected from the join table.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Attached is a test project that contains two basic tests, one for the id case and one for referencing a basic property. Further tests should also cover other types of paths like associations etc.</p> </td>
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