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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>[DOCS-12756] Update documentation regarding using $lookup on array as localField</title>
                <link>https://jira.mongodb.org/browse/DOCS-12756</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;I&apos;ve noticed that the documentation at &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/#use-lookup-with-an-array&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/#use-lookup-with-an-array&lt;/a&gt; says on using $lookup with an array as local field:&lt;/p&gt;

&lt;p&gt;&quot;If your &lt;tt&gt;localField&lt;/tt&gt; is an array and you&#8217;d like to match the elements inside it against a &lt;tt&gt;foreignField&lt;/tt&gt; which is a single element, you&#8217;ll need to &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/unwind/#pipe._S_unwind&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$unwind&lt;/tt&gt;&lt;/a&gt; the array as one stage of the aggregation pipeline.&quot;&lt;/p&gt;

&lt;p&gt;This is no longer true since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22821&quot; title=&quot;assert in lock_file_fail_to_open.js should be wrapped in assert.soon&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22821&quot;&gt;&lt;del&gt;SERVER-22821&lt;/del&gt;&lt;/a&gt; was fixed a while ago, isn&apos;t it? AFAIK you don&apos;t need to use $unwind anymore to join an array as local field against a single foreign value.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
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                <environment></environment>
        <key id="778352">DOCS-12756</key>
            <summary>Update documentation regarding using $lookup on array as localField</summary>
                <type id="12510" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Feedback</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="fwein">Frank Wein</reporter>
                        <labels>
                    </labels>
                <created>Mon, 27 May 2019 19:11:49 +0000</created>
                <updated>Mon, 30 Oct 2023 22:19:24 +0000</updated>
                            <resolved>Tue, 2 Jul 2019 20:57:05 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2261335" author="fwein" created="Mon, 27 May 2019 19:14:31 +0000"  >&lt;p&gt;Make that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22881&quot; title=&quot; lookup between local (multiple)array of values and foreign (single) value &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22881&quot;&gt;&lt;del&gt;SERVER-22881&lt;/del&gt;&lt;/a&gt; in the description, the other link was a typo.&lt;/p&gt;</comment>
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            <issuekey id="319569">DOCS-8930</issuekey>
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