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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-76684] Cached plans from inner $lookup single solution queries should be pinned</title>
                <link>https://jira.mongodb.org/browse/SERVER-76684</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Single solution queries should always &lt;a href=&quot;https://github.com/mongodb/mongo/blob/535d68dac4cbc7dda355ca37584e56c61029fd6d/src/mongo/db/query/plan_cache.h#L83-L88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pin&lt;/a&gt; their plan cache entry, so that they are not subject to replanning. It doesn&apos;t make sense to potentially replan these queries because we will never get a different result.&lt;/p&gt;

&lt;p&gt;For classic, the only single solution plans we cache are the inner $lookup queries. For SBE, we create cache entries for a broader set of single solution queries. This ticket can &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/get_executor.cpp#L1390-L1402&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;consolidate logic&lt;/a&gt; between SBE and classic for caching single solution queries.&lt;/p&gt;

&lt;p&gt;This should be done before SBE is enabled for the inner side of $lookup.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2327666">SERVER-76684</key>
            <summary>Cached plans from inner $lookup single solution queries should be pinned</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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>quick-tech-debt</label>
                    </labels>
                <created>Fri, 28 Apr 2023 18:27:26 +0000</created>
                <updated>Tue, 23 Jan 2024 16:37:50 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5394455" author="JIRAUSER1253388" created="Tue, 2 May 2023 15:51:48 +0000"  >&lt;p&gt;I will probably be busy for the remainder of this sprint with the two projects I am currently on. After that I think I&apos;ll have time to take this.&lt;/p&gt;</comment>
                            <comment id="5394392" author="JIRAUSER1257467" created="Tue, 2 May 2023 15:42:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev@mongodb.com&quot;&gt;misha.tyulenev@mongodb.com&lt;/a&gt; , would Matt be available to work on this project sometime soon?&lt;/p&gt;</comment>
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            <issuekey id="2554342">SERVER-85595</issuekey>
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