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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-12782" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-93d0b0b6-abfd-43ea-9faa-7efb651ab054" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12782" style="color: #3b73af; text-decoration: none">HHH-12782</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-12782" style="color: #3b73af; text-decoration: none">Diamond shaped OneToMany + FetchType.EAGER + FetchMode.JOIN causes N+1 selects</a> </span> </td>
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<td class="has-icon" style="padding: 0; 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-93d0b0b6-abfd-43ea-9faa-7efb651ab054" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.2 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Diamond.jpg </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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 09/Jul/2018 15:15 PM </td>
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<td class="has-icon" style="padding: 0; 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-8a6e1295-ae47-4fae-b5e5-c346326cba2e" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<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="mike.puth" id="email_mike.puth" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mike.puth" style="color:#6c797f;; color: #3b73af; text-decoration: none">Pit Humke</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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0"><b>Problem summary:</b><br> When mapping "diamond shaped" OneToMany relationships using FetchType.EAGER and FetchMode.JOIN, Hibernate generates N+1 select statements. Here is what I mean with "diamond shape":</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><span class="image-wrap" style=""><a id="49288_thumb" href="https://hibernate.atlassian.net/secure/attachment/49288/49288_Diamond.jpg" title="Diamond.jpg" file-preview-type="image" file-preview-id="49288" file-preview-title="Diamond.jpg" style="color: #3b73af; text-decoration: none">
<jira-attachment-thumbnail url="https://hibernate.atlassian.net/secure/thumbnail/49288/Diamond.jpg?default=false" jira-url="https://hibernate.atlassian.net/secure/thumbnail/49288/Diamond.jpg" filename="Diamond.jpg">
<img src="https://hibernate.atlassian.net/secure/thumbnail/49288/Diamond.jpg" data-attachment-name="Diamond.jpg" data-attachment-type="thumbnail" data-media-services-id="e68f0f91-9eb7-4189-b09b-4c9e3896f005" data-media-services-type="file" style="border: 0px solid black">
</jira-attachment-thumbnail></a></span></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Expected behavior:</b><br> A single select statement with two joins on the "BOTTOM" table.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Actual behavior:</b></p>
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<pre class="code-sql" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">SELECT</span> top0_.id <span class="code-keyword" style="color: #000091">AS</span> id1_3_0_,
left1_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_1_1_,
left1_.id <span class="code-keyword" style="color: #000091">AS</span> id1_1_1_,
left1_.id <span class="code-keyword" style="color: #000091">AS</span> id1_1_2_,
left1_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_1_2_,
bottom2_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_0_3_,
bottom2_.id <span class="code-keyword" style="color: #000091">AS</span> id1_0_3_,
bottom2_.id <span class="code-keyword" style="color: #000091">AS</span> id1_0_4_,
bottom2_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_0_4_,
right3_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_2_5_,
right3_.id <span class="code-keyword" style="color: #000091">AS</span> id1_2_5_,
right3_.id <span class="code-keyword" style="color: #000091">AS</span> id1_2_6_,
right3_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_2_6_
<span class="code-keyword" style="color: #000091">FROM</span> <span class="code-keyword" style="color: #000091">Top</span> top0_
<span class="code-keyword" style="color: #000091">LEFT</span> <span class="code-keyword" style="color: #000091">OUTER</span> <span class="code-keyword" style="color: #000091">JOIN</span> <span class="code-keyword" style="color: #000091">Left</span> left1_
<span class="code-keyword" style="color: #000091">ON</span> top0_.id = left1_.parent
<span class="code-keyword" style="color: #000091">LEFT</span> <span class="code-keyword" style="color: #000091">OUTER</span> <span class="code-keyword" style="color: #000091">JOIN</span> Bottom bottom2_
<span class="code-keyword" style="color: #000091">ON</span> left1_.id = bottom2_.parent
<span class="code-keyword" style="color: #000091">LEFT</span> <span class="code-keyword" style="color: #000091">OUTER</span> <span class="code-keyword" style="color: #000091">JOIN</span> <span class="code-keyword" style="color: #000091">Right</span> right3_
<span class="code-keyword" style="color: #000091">ON</span> top0_.id = right3_.parent
<span class="code-keyword" style="color: #000091">WHERE</span> top0_.id = ?
<span class="code-keyword" style="color: #000091">SELECT</span> bottom0_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_0_0_,
bottom0_.id <span class="code-keyword" style="color: #000091">AS</span> id1_0_0_,
bottom0_.id <span class="code-keyword" style="color: #000091">AS</span> id1_0_1_,
bottom0_.parent <span class="code-keyword" style="color: #000091">AS</span> parent2_0_1_
<span class="code-keyword" style="color: #000091">FROM</span> Bottom bottom0_
<span class="code-keyword" style="color: #000091">WHERE</span> bottom0_.parent = ?
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Detailed explanation and code sample:</b><br> <a href="https://stackoverflow.com/q/51199440/3216347" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://stackoverflow.com/q/51199440/3216347</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><b>Test Case:</b><br> I am currently working on a test case. I will update this ticket as soon as possible.</p> </td>
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