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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/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3390" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-01c2c503-b7f0-4c40-81da-9f8dd7136c3e" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3390" style="color: #3b73af; text-decoration: none">HSEARCH-3390</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/HSEARCH-3390" style="color: #3b73af; text-decoration: none">Add support for composite projections</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-01c2c503-b7f0-4c40-81da-9f8dd7136c3e" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </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">Assignee:</th>
<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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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> engine, query </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"> 08/Oct/2018 01:42 AM </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">Fix Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 6.0.0.Alpha1 </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">Reporter:</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="yrodiere" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none">Yoann Rodière</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">Follow-up on <span class="jira-issue-macro" data-jira-key="HSEARCH-3222"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3222" class="jira-issue-macro-key issue-link" title="Introduce a projection DSL" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12151&avatarType=issuetype"> HSEARCH-3222 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-current jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">In Progress</span> </span> .</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The idea would be to provide a type-safe solution to building objects that encompass multiple projections, for example a "Color" object that requires a projection on the "red", "green" and "blue" fields.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">In the future (not in this ticket), this will be particularly useful when combined with multi-valued nested object fields, allowing to get a <tt>List<Color></tt> from a projection for example.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Draft: <a href="https://github.com/yrodiere/hibernate-search/tree/projections-syntax-attempt2" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/yrodiere/hibernate-search/tree/projections-syntax-attempt2</a> , <a href="https://github.com/yrodiere/hibernate-search/commit/5f9f56f587d3e44344b773bdefeb70c8fedf1be1" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/yrodiere/hibernate-search/commit/5f9f56f587d3e44344b773bdefeb70c8fedf1be1</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We decided to give up on the fluid API for composite projections, for two reasons:</p>
<ol>
<li>We decided to remove the fluid APIs for predicates and sorts, so let's be consistent</li>
<li>Having one interface per number of parameters is complex to implement (or at least very redundant), and it also makes implementing extensions much more complex, because we'll have to implement each interface in each backend...</li>
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