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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-65489] Investigate replacing terminal unwind of foreign key in $lookup with a conditional one</title>
                <link>https://jira.mongodb.org/browse/SERVER-65489</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if the terminal value in the foreign key is a scalar, we&apos;ll add the scalar to the stream of foreign key values twice, first from the unwind and then as a &quot;whole value&quot;. We should investigate whether making the unwind conditional on the terminal being an array would improve perf of NLJ.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2023318">SERVER-65489</key>
            <summary>Investigate replacing terminal unwind of foreign key in $lookup with a conditional one</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="irina.yatsenko@mongodb.com">Irina Yatsenko</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Apr 2022 16:19:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:37 +0000</updated>
                            <resolved>Mon, 25 Apr 2022 16:15:09 +0000</resolved>
                                                    <fixVersion>6.0.0-rc2</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4505066" author="xgen-internal-githook" created="Mon, 25 Apr 2022 21:11:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Irina Yatsenko&apos;, &apos;email&apos;: &apos;irina.yatsenko@mongodb.com&apos;, &apos;username&apos;: &apos;IrinaYatsenko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65489&quot; title=&quot;Investigate replacing terminal unwind of foreign key in $lookup with a conditional one&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65489&quot;&gt;&lt;del&gt;SERVER-65489&lt;/del&gt;&lt;/a&gt; Make unwind of the terminal foreign key value conditioned on whether the value is an array&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 55c81877e5c873f0aa66603552ea4bab8e5caec9)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/03c459860f88e55b6842583f857d00346a1af11d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/03c459860f88e55b6842583f857d00346a1af11d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4499970" author="JIRAUSER1259274" created="Fri, 22 Apr 2022 14:52:01 +0000"  >&lt;p&gt;The change provides a considerable performance improvement (up to 30% in some micro-benchmarks) in $lookup queries with scalar foreign keys.&lt;/p&gt;</comment>
                            <comment id="4498899" author="xgen-internal-githook" created="Fri, 22 Apr 2022 04:01:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Irina Yatsenko&apos;, &apos;email&apos;: &apos;irina.yatsenko@mongodb.com&apos;, &apos;username&apos;: &apos;IrinaYatsenko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65489&quot; title=&quot;Investigate replacing terminal unwind of foreign key in $lookup with a conditional one&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65489&quot;&gt;&lt;del&gt;SERVER-65489&lt;/del&gt;&lt;/a&gt; Make unwind of the terminal foreign key value conditioned on whether the value is an array&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55c81877e5c873f0aa66603552ea4bab8e5caec9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55c81877e5c873f0aa66603552ea4bab8e5caec9&lt;/a&gt;&lt;/p&gt;</comment>
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