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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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-75506] Cache $lookup inner query plans with single solution</title>
                <link>https://jira.mongodb.org/browse/SERVER-75506</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For $lookup inner queries that have only one query solution, &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/get_executor.cpp#L825&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we do not multiplan&lt;/a&gt; and therefore do not cache. However caching these plans is beneficial to performance, we are seeing an 8% overall improvement in TPCH Q11 throughput and 3% improvement in TPCH Q7.&lt;/p&gt;

&lt;p&gt;To avoid affecting a large class of queries, we should only force the cache when the query comes from a lookup. We can set a variable &lt;a href=&quot;https://github.com/10gen/mongo/blob/cde14c1df8b05925cfd24b3e49193734545bc5bd/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L149-L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;via the ExpressionContext&lt;/a&gt; to communicate this flag.&lt;/p&gt;



&lt;p&gt;&lt;a href=&quot;https://mongodb.slack.com/archives/G01FR6HHE3T/p1680117454009739&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Slack discussion&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2302189">SERVER-75506</key>
            <summary>Cache $lookup inner query plans with single solution</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="13201">Fixed</resolution>
                                        <assignee username="matt.boros@mongodb.com">Matt Boros</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                            <label>perf-70-blocker</label>
                    </labels>
                <created>Thu, 30 Mar 2023 15:43:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:57 +0000</updated>
                            <resolved>Tue, 11 Apr 2023 14:29:43 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5337066" author="xgen-internal-githook" created="Tue, 11 Apr 2023 04:32:00 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Matt Boros&apos;, &apos;email&apos;: &apos;matt.boros@mongodb.com&apos;, &apos;username&apos;: &apos;mattBoros&apos;}
&lt;p&gt;Message: &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; Cache $lookup inner query plans with single solution&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a2fe90f565894a439ccb70713892311a3a0ee1d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a2fe90f565894a439ccb70713892311a3a0ee1d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5325252" author="JIRAUSER1253388" created="Wed, 5 Apr 2023 01:53:23 +0000"  >&lt;p&gt;&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;Here&apos;s&lt;/a&gt; a summary of the performance changes for TPC-H queries affected by this ticket. I will also look into non-TPCH benchmarks for $lookup.&lt;/p&gt;</comment>
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