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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=eyJpIjoiNDk0N2Q3NGNlYzczNDdhZTg0ZjFjYWIxZDc4MTVhYWYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3797?atlOrigin=eyJpIjoiNDk0N2Q3NGNlYzczNDdhZTg0ZjFjYWIxZDc4MTVhYWYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-745d3fa1-22cd-48db-81f6-fd0b710ad445" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3797?atlOrigin=eyJpIjoiNDk0N2Q3NGNlYzczNDdhZTg0ZjFjYWIxZDc4MTVhYWYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3797</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-3797?atlOrigin=eyJpIjoiNDk0N2Q3NGNlYzczNDdhZTg0ZjFjYWIxZDc4MTVhYWYiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Two-phase projections in the Lucene backend</a> </span> </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"> <span class="diffcontext">Currently, we implement projections by adding collectors next to the {{TopDocsCollector}}.<br><br>The problem with this strategy is that collectors will then be applied to all documents in the index.<br><br>It's not even just the competitive documents (those that have a score higher than the lowest document in the priority queue when they are visisted): as we can see in MultiCollector, joining multiple collectors together will disable score-based optimizations that would allow skipping some documents along the way.<br><br>As a result, the distance collector for example will need to store in memory as many results as the total number of</span> <span class="diffaddedchars" style="background-color:#ddfade;"> matching</span> <span class="diffcontext"> documents in the index.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> Regardless of the limit passed to {{fetch(limit)}}.</span> <span class="diffcontext"> Which is ridiculous.<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">Worse, starting with recent changes, the default projection that only retrieves document IDs will always add a collector next to the {{TopDocsCollector}}... and this collector will always build a list as large as the total number of matching documents in the index.<br><br>For. Each. Single. Search.<br><br></span> <span class="diffcontext">We should switch to a two-phase approach:<br><br># First phase: {{search.search()}} call that inspects all documents to collect the top docs and their score (TopDocsCollector), and if necessary the aggregations (FacetsCollector).<br># Second phase: explicit collection that inspects only top docs to extract data from docvalues (DistanceCollector) or from storage (reader.document(...) using the StoredFieldVisitor: even if the javadoc advises against it, in this case it would be fine). Maybe we can use collectors, but a different abstraction would be fine, since we do not need to perform a search, but rather to inspect a pre-determined set of documents.<br><br>Note that solving this ticket should fix HSEARCH-3786.<br></span> </td>
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