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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-6605] Enhanced Equality Match Meaning on $lookup</title>
                <link>https://jira.mongodb.org/browse/DOCS-6605</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;As described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21469?focusedCommentId=1089355&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-1089355&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Charlie&apos;s comment&lt;/a&gt;, if the localField is an array matching against a field inside will behave as null.&lt;/p&gt;

&lt;p&gt;We may want to note this and recommend that users unwind first if their localFields are arrays.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="239589">DOCS-6605</key>
            <summary>Enhanced Equality Match Meaning on $lookup</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="9">Done</resolution>
                                        <assignee username="steve.renaker@mongodb.com">Steve Renaker</assignee>
                                    <reporter username="kelsey.schubert@mongodb.com">Kelsey Schubert</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Nov 2015 18:50:46 +0000</created>
                <updated>Mon, 30 Oct 2023 21:39:30 +0000</updated>
                            <resolved>Wed, 27 Apr 2016 22:28:29 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1249245" author="xgen-internal-githook" created="Thu, 28 Apr 2016 15:35:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;steveren&apos;, u&apos;name&apos;: u&apos;Steve Renaker&apos;, u&apos;email&apos;: u&apos;steve.renaker@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-6605&quot; title=&quot;Enhanced Equality Match Meaning on $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-6605&quot;&gt;&lt;del&gt;DOCS-6605&lt;/del&gt;&lt;/a&gt;: changed headings for examples&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/4a017ea0b81e7b616b5a4ee7c3e6a5fee0874fee&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/4a017ea0b81e7b616b5a4ee7c3e6a5fee0874fee&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1249244" author="xgen-internal-githook" created="Thu, 28 Apr 2016 15:35:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;steveren&apos;, u&apos;name&apos;: u&apos;Steve Renaker&apos;, u&apos;email&apos;: u&apos;steve.renaker@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-6605&quot; title=&quot;Enhanced Equality Match Meaning on $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-6605&quot;&gt;&lt;del&gt;DOCS-6605&lt;/del&gt;&lt;/a&gt;: added $unwind example to $lookup page&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b6a2e00a5d79c7429482d40d7195f84e8619fa32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b6a2e00a5d79c7429482d40d7195f84e8619fa32&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1249243" author="xgen-internal-githook" created="Thu, 28 Apr 2016 15:35:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;steveren&apos;, u&apos;name&apos;: u&apos;Steve Renaker&apos;, u&apos;email&apos;: u&apos;steve.renaker@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-6605&quot; title=&quot;Enhanced Equality Match Meaning on $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-6605&quot;&gt;&lt;del&gt;DOCS-6605&lt;/del&gt;&lt;/a&gt;: Enhanced Equality Match Meaning on $lookup&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/a01cbebcbcb29b241a7645b5ec629001e76ec803&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/a01cbebcbcb29b241a7645b5ec629001e76ec803&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="239478">SERVER-21469</issuekey>
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