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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=eyJpIjoiOGRlOGY5MWE5NTJiNGIwYTgxN2Y0M2E4MmUxNzM1NDQiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3955?atlOrigin=eyJpIjoiOGRlOGY5MWE5NTJiNGIwYTgxN2Y0M2E4MmUxNzM1NDQiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-f9f6ad1c-9469-4c82-aee2-c211e1037a90" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3955?atlOrigin=eyJpIjoiOGRlOGY5MWE5NTJiNGIwYTgxN2Y0M2E4MmUxNzM1NDQiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3955</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-3955?atlOrigin=eyJpIjoiOGRlOGY5MWE5NTJiNGIwYTgxN2Y0M2E4MmUxNzM1NDQiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Object fields that are both nested and flattened (ES's include_in_parent)</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-f9f6ad1c-9469-4c82-aee2-c211e1037a90" 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">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"> 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"> 18/Jun/2020 23:38 PM </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.x-backlog </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">Priority:</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-static-major-f1994dad-9ad5-4d37-8f9b-79f86998acff" 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="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">While nested documents provide additional features, we don't needed nested documents for <b>everything</b>. Predicates on a single field when we're not using the <tt>nested</tt> predicate, in particular, work perfectly well on flattened object fields, and actually perform better since we don't need a runtime join.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">To get the best of both worlds, when one can spare the extra disk space it requires, we could allow object fields to be stored <b>both</b> as a nested document and flattened in their parent. Elasticsearch allows that with the attribute <tt>include_in_parent</tt> (see <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/nested.html#nested-params" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">https://www.elastic.co/guide/en/elasticsearch/reference/current/nested.html#nested-params</a>).</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">API-wise, this could just be an additional value for the <tt>ObjectStructure</tt> enum: <tt>ObjectStructure.NESTED_AND_FLATTENED</tt>. We could then take advantage of this internally: when nesting is not necessary (no <tt>nested</tt> predicate, no <tt>filter</tt> in sorts and aggregations), we can just use the flattened field.</p> </td>
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