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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85595] [Classic] Cache single solution plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-85595</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&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; cached single solution plans when inside a $lookup, and saw up to a 9% improvement in TPCH benchmarks with no confirmed regressions. We should consider caching &lt;em&gt;all&lt;/em&gt; single solution plans to get this perf improvement.&lt;/p&gt;

&lt;p&gt;Originally we did not cache single solution plans in classic to save space in the cache, and because planning was &quot;fast enough&quot;. However the cache is clearly faster so we should look into this.&lt;/p&gt;

&lt;p&gt;SBE plans are always cached, and from what I&apos;ve seen through $planCacheStats, they tend to take more space as well (compared to classic SolutionCacheData). So in terms of space it seems okay to cache classic plans always (of course this should be tested, and I also understand that the capacity limits are different for classic and SBE caches).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2554342">SERVER-85595</key>
            <summary>[Classic] Cache single solution plans</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
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                <created>Tue, 23 Jan 2024 16:09:51 +0000</created>
                <updated>Mon, 29 Jan 2024 15:33:37 +0000</updated>
                            <resolved>Mon, 29 Jan 2024 15:33:37 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="6035481" author="david.storch" created="Tue, 23 Jan 2024 19:17:54 +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; I&apos;d say that we should close this as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13341&quot; title=&quot;Cache single solution query plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13341&quot;&gt;SERVER-13341&lt;/a&gt;. Before going ahead with this, we should measure what kind of performance benefit this will actually give us. It&apos;s not clear to me without numbers that it&apos;s an obvious win.&lt;/p&gt;</comment>
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