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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?atlOrigin=eyJpIjoiNzhlOGUxNWE2YzE5NDY0OGE5N2NkMjIyNjZmMmRhZDgiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3943?atlOrigin=eyJpIjoiNzhlOGUxNWE2YzE5NDY0OGE5N2NkMjIyNjZmMmRhZDgiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-1ce5d2a0-27eb-40d1-8927-2e40bc392419" 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-3943?atlOrigin=eyJpIjoiNzhlOGUxNWE2YzE5NDY0OGE5N2NkMjIyNjZmMmRhZDgiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3943</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-3943?atlOrigin=eyJpIjoiNzhlOGUxNWE2YzE5NDY0OGE5N2NkMjIyNjZmMmRhZDgiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Projection nesting: preserving the document structure in 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-1ce5d2a0-27eb-40d1-8927-2e40bc392419" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"> New Feature </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="yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b"> Yoann Rodière </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">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> backend-elasticsearch, backend-lucene, engine </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/Jun/2020 01:37 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"> 6.0.0.Beta-backlog-high-priority </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="yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b"> 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">As of <span class="jira-issue-macro" data-jira-key="HSEARCH-3391"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3391" class="jira-issue-macro-key issue-link" title="Projection on multi-valued fields" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=medium&avatarId=12151&avatarType=issuetype"> HSEARCH-3391 </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> , given the following document:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
<div class="preformattedContent panelContent" style="padding: 9px 12px">
<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">{
"authors": [{
"firstName": "Daniel",
"lastName": "Abraham"
}, {
"firstName" "Ty",
"lastName": "Frank"
}]
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">... you can retrieve all values of "authors.firstName" in a single list (<tt>List<String></tt>, <tt><span class="error">["Daniel", "Ty"]</span></tt>), and you can retrieve all values of "authors.lastName" in another list (<tt>List<String></tt>, <tt><span class="error">["Abraham", "Frank"]</span></tt>). These projections are effectively flattened, because the "authors" part of the structure is gone.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">What you cannot do is retrieve all the pairs <tt>firstName</tt>/<tt>lastName</tt>. In order for that to be possible, we would need some way to tell Hibernate Search "these two fields must be grouped together for each author", similarly to the "nested" predicate.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Note that for the Elasticsearch backend we could make this "grouping" work regardless of whether "authors" is nested or flattened, because we have the full JSON. However, that's not the case for the Lucene backend.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Tickets depending on this: <span class="jira-issue-macro" data-jira-key="HSEARCH-3927"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3927" class="jira-issue-macro-key issue-link" title="Projection to a DTO/JavaBean/etc." style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=medium&avatarId=12151&avatarType=issuetype"> HSEARCH-3927 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete 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">Open</span> </span> </p> </td>
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