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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-76591] Move custom limit pushdown for search queries to generic sharded agg limit pushdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-76591</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a custom optimization for $search where we try to &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/blob/e56380cab5d0c2866798bb8fbd9c5515490f6143/src/search/document_source_internal_search_mongot_remote.cpp#L256-L268&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extract a limit for pushdown to the shards&lt;/a&gt; (similar for the $idLookup stage). This was put in place most likely because the &lt;a href=&quot;https://github.com/10gen/mongo/blob/b1b452c5d6f74e2ab33df94b42a9dfda733797c5/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L508&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;generic limit pushdown&lt;/a&gt; was not triggering for search queries after the sharded facets project. Upon closer inspection, it seems possible that changing the stage constraints for $setVariableFromSubPipeline (added for sharded facets) to allow swapping with limit will enable the generic pushdown. &lt;/p&gt;

&lt;p&gt;Also worth noting that as of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72934&quot; title=&quot;Avoid creating a metadata merging pipeline for search queries which do not reference $$SEARCH_META&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72934&quot;&gt;&lt;del&gt;SERVER-72934&lt;/del&gt;&lt;/a&gt;, we only create the $setVariableFromSubPipeline stage if there&apos;s a reference to SEARCH_META, so we should test both scenarios. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2325866">SERVER-76591</key>
            <summary>Move custom limit pushdown for search queries to generic sharded agg limit pushdown</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>qi-search</label>
                            <label>quick-tech-debt</label>
                    </labels>
                <created>Thu, 27 Apr 2023 13:55:13 +0000</created>
                <updated>Mon, 5 Feb 2024 20:23:39 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
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