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<td class="page-title-pattern-first-line " style="padding: 0; 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-11569" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-f4734c3d-0827-45b1-ba49-a19e5cc05f83" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11569" style="color: #3b73af; text-decoration: none">HHH-11569</a> </td>
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<td style="vertical-align: top;; padding: 0; 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-11569" style="color: #3b73af; text-decoration: none">Return only distinct elements when query is hinted with EntityGraph</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">Change By:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="mih_vlad" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vlad Mihalcea</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">I came to an unwanted behavior of Hibernate while retrieving many to many relationship by fetch graph hinted hql. Hibernate executed left outer join query to retrieve that entity and thus returned duplicate results ([reason|https://developer.jboss.org/wiki/HibernateFAQ-AdvancedProblems?_sscc=t#Hibernate_does_not_return_distinct_results_for_a_query_with_outer_join_fetching_enabled_for_a_collection_even_if_I_use_the_distinct_keyword]). <br><br>But my point is that there is a difference between user specifying Entity graph and manually executing HQL query with left joins.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> <br><br></span> <span class="diffcontext"> When user is explicitly executing left outer join, he might be aware of possibility of duplication, but this is not the case with entity graph. User might be unaware of this & he may rely on size() operation to get the count. Besides, entity graph contract only tells about properties to be fetched, so it should not modify the result set (especially the count of returned entities)</span> </td>
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