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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-12897" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-c74a3c1a-77ce-4690-9aed-1456f7f30e14" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12897" style="color: #3b73af; text-decoration: none">HHH-12897</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-12897" style="color: #3b73af; text-decoration: none">EntityGraph Cartesian Product Issue</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: 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-c74a3c1a-77ce-4690-9aed-1456f7f30e14" 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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.1, 5.3.2, 5.3.3, 5.3.4 </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"> 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: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 09/Aug/2018 02:59 AM </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"> cartesian-product hibernate jpa2 performance </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-919f1e4f-3ad6-4716-9959-1834bc94c4b9" 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="nathanastanley" id="email_nathanastanley" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=nathanastanley" style="color:#6c797f;; color: #3b73af; text-decoration: none">Nathan Stanley</a> </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">Original Estimate:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</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">Remaining Estimate: </th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</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">When loading data using an EntityGraph there is no ability to specify the FetchMode and FetchMode.JOIN is used in all scenarios. If an entity has multiple OneToMany relationships this leads to an SQL Query which generates a Cartesian product of the child entities. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Example:<br> (Using Spring data jpa @EntityGraph annotation)</p>
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<b>Member.java</b>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Member {
@OneToMany
<span class="code-keyword" style="color: #000091">private</span> Set<Address> addresses;
@OneToMany
<span class="code-keyword" style="color: #000091">private</span> Set<Contact> contacts;
@OneToMany
<span class="code-keyword" style="color: #000091">private</span> Set<CustomField> customFields;
@OneToMany
<span class="code-keyword" style="color: #000091">private</span> Set<Invoice> invoices;
}
</pre>
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<b>MemberRepository.java</b>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Repository
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">interface</span> MemberRepository <span class="code-keyword" style="color: #000091">extends</span> JpaRepository<<span class="code-object" style="color: #910091">Long</span>, Member> {
@EntityGraph(attributePaths={<span class="code-quote" style="color: #009100">"addresses"</span>, <span class="code-quote" style="color: #009100">"contacts"</span>, <span class="code-quote" style="color: #009100">"customFields"</span>, <span class="code-quote" style="color: #009100">"invoices"</span>})
Member findById(<span class="code-object" style="color: #910091">Long</span> id);
@EntityGraph(attributePaths={<span class="code-quote" style="color: #009100">"addresses"</span>, <span class="code-quote" style="color: #009100">"contacts"</span>, <span class="code-quote" style="color: #009100">"customFields"</span>, <span class="code-quote" style="color: #009100">"invoices"</span>})
List<Member> findAll();
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If all members had approximately 5 contacts, 3 addresses, 10 customFields and 15 invoices this leads to a SQL query which returns 5 x 3 x 10 x 15 = 2250 rows to load a single member!</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If there was a way to specify the FetchMode dynamically using the Criteria api or similar this would potentially solve the issue. FetchMode.SUBSELECT appears to be the ideal solution here, where a new query would be generated to load ALL the entities of a particular type from the origin point, even when loading a collection. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Example:</p>
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<b>MemberRepository.java</b>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@EntityGraph(attributePaths={<span class="code-quote" style="color: #009100">"addresses"</span>, <span class="code-quote" style="color: #009100">"contacts"</span>, <span class="code-quote" style="color: #009100">"customFields"</span>, <span class="code-quote" style="color: #009100">"invoices"</span>})
List<Member> findAll();
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">1 query for all members<br> 1 query for all addresses for all members <br> 1 query for all contacts for all members<br> 1 query for all customFields for all members<br> 1 query for all invoices for all members</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This leads to a fixed number of queries (avoiding the N+1 issue) and no duplicate data being loaded.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, looking through the source - AbstractEntityGraphVisitationStrategy.class and FetchStyleLoadPlanBuildingAssociationVisitationStrategy.class there appears to be code designed to detect multiple collections and adjust the strategy if needed but it is either not working or incomplete.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Line 247 - 264:</p>
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<b>AbstractEntityGraphVisitationStrategy.java</b>
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<pre class="code-java" 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">protected</span> FetchStrategy adjustJoinFetchIfNeeded(
AssociationAttributeDefinition attributeDefinition,
FetchStrategy fetchStrategy) {
<span class="code-keyword" style="color: #000091">if</span> ( lockMode.greaterThan( LockMode.READ ) ) {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">new</span> FetchStrategy( fetchStrategy.getTiming(),
FetchStyle.SELECT );
}
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Integer</span> maxFetchDepth = sessionFactory().getSettings()
.getMaximumFetchDepth();
<span class="code-keyword" style="color: #000091">if</span> ( maxFetchDepth != <span class="code-keyword" style="color: #000091">null</span> && currentDepth() > maxFetchDepth ) {
<span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">new</span> FetchStrategy( fetchStrategy.getTiming(),
FetchStyle.SELECT );
}
<span class="code-keyword" style="color: #000091">if</span> ( attributeDefinition.getType().isCollectionType() &&
isTooManyCollections() ) {
<span class="code-comment" style="color: #808080">// todo : have <span class="code-keyword" style="color: #000091; color: #808080">this</span> revert to batch or subselect fetching
</span> <span class="code-comment" style="color: #808080">// once <span class="code-quote" style="color: #009100; color: #808080">"sql gen redesign"</span> is in place
</span> <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">new</span> FetchStrategy( fetchStrategy.getTiming(),
FetchStyle.SELECT );
}
<span class="code-keyword" style="color: #000091">return</span> fetchStrategy;
}
</pre>
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