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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-58426] Add planning logic for $lookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-58426</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We must add logic to the query planner for planning a $lookup. This involves examining the size of the collections involved and choosing the join algorithm (nlj or hashed) using the heuristic we agreed on here:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;b&gt;Foreign collection has index to answer join predicate?&lt;/b&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;b&gt;Size of foreign collection&lt;/b&gt;&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&lt;b&gt;Strategy&lt;/b&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Yes&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Anything&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Indexed NLJ&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;No&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;lt; 10k docs&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Hash Join (foreign side is build side)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;No&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;&amp;gt;= 10k docs&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;NLJ&lt;/td&gt;
&lt;/tr&gt;
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                <environment></environment>
        <key id="1815161">SERVER-58426</key>
            <summary>Add planning logic for $lookup</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jul 2021 14:24:29 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:05 +0000</updated>
                            <resolved>Fri, 11 Feb 2022 20:24:44 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4349104" author="xgen-internal-githook" created="Thu, 10 Feb 2022 21:20:20 +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-58426&quot; title=&quot;Add planning logic for $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58426&quot;&gt;&lt;del&gt;SERVER-58426&lt;/del&gt;&lt;/a&gt; Implement $lookup planning logic&lt;/p&gt;

&lt;p&gt;Co-authored-by: Mihai Andrei &amp;lt;mihai.andrei@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/80224491b2f8341930d6b1f45ff935367ee2538f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/80224491b2f8341930d6b1f45ff935367ee2538f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1976884">SERVER-63262</issuekey>
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