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    <title>MongoDB Jira</title>
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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-75732] Cache $lookup single solution inner queries when sharded</title>
                <link>https://jira.mongodb.org/browse/SERVER-75732</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75506&quot; title=&quot;Cache $lookup inner query plans with single solution&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75506&quot;&gt;&lt;del&gt;SERVER-75506&lt;/del&gt;&lt;/a&gt;, caching single solution queries on the inner side of a non-sharded $lookup lead to a &lt;a href=&quot;https://docs.google.com/document/d/1ZG6XIcxH_LpsmXEcguKC8cV-T0g6ZQyVX0MEmhvguAg/edit?usp=sharing&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;positive performance impact&lt;/a&gt;. This could have a positive impact on sharded lookup as well, but some performance investigation should be done first.&lt;/p&gt;

&lt;p&gt;For this ticket we should implement this change for sharded $lookup, analyze the perf impact, and make a decision about whether to commit it or not.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2308060">SERVER-75732</key>
            <summary>Cache $lookup single solution inner queries when sharded</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Apr 2023 20:36:21 +0000</created>
                <updated>Mon, 22 Jan 2024 14:05:08 +0000</updated>
                            <resolved>Mon, 22 Jan 2024 14:05:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5355665" author="JIRAUSER1253388" created="Tue, 18 Apr 2023 14:26:55 +0000"  >&lt;p&gt;I believe we were planning on wrapping up PM-3210 last week (correct me if I&apos;m wrong Kyle). Also the related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75294&quot; title=&quot;Investigate slowness of sharded $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75294&quot;&gt;&lt;del&gt;SERVER-75294&lt;/del&gt;&lt;/a&gt; doesn&apos;t seem specific to 7.0, my understanding is it&apos;s a more general comparison of unsharded lookup to sharded lookup. Since it&apos;s not 7.0 specific I don&apos;t think it fits into PM-3210.&lt;/p&gt;</comment>
                            <comment id="5355598" author="JIRAUSER1257467" created="Tue, 18 Apr 2023 14:15:08 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.boros%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matt.boros@mongodb.com&quot;&gt;matt.boros@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez@mongodb.com&quot;&gt;kyle.suarez@mongodb.com&lt;/a&gt; can this ticket be done as part of&#160;PM-3210?&lt;/p&gt;</comment>
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