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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>[DOCS-13236] Investigate changes in SERVER-42137: Allow aggregation $merge stage to write to a collection that the query also reads from</title>
                <link>https://jira.mongodb.org/browse/DOCS-13236</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;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    This patch removes the following restrictions on $merge (both from &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/merge/#merge-into):&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/aggregation/merge/#merge-into):&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;-The output collection cannot be the same collection as the collection being aggregated&lt;br/&gt;
-The output collection cannot appear in any other stages of the pipeline &lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    Enable functionality to permit $out to merge/append to the aggregation source collection.&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="1016282">DOCS-13236</key>
            <summary>Investigate changes in SERVER-42137: Allow aggregation $merge stage to write to a collection that the query also reads from</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="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-aggregation</label>
                            <label>docs-grab-bag</label>
                    </labels>
                <created>Wed, 20 Nov 2019 20:46:16 +0000</created>
                <updated>Mon, 13 Nov 2023 18:13:32 +0000</updated>
                            <resolved>Mon, 3 Feb 2020 19:09:55 +0000</resolved>
                                                    <fixVersion>4.3.2</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2780954" author="xgen-internal-githook" created="Mon, 3 Feb 2020 19:08:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;jeff-allen-mongo&apos;, &apos;name&apos;: &apos;jeff-allen-mongo&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13236&quot; title=&quot;Investigate changes in SERVER-42137: Allow aggregation $merge stage to write to a collection that the query also reads from&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13236&quot;&gt;&lt;del&gt;DOCS-13236&lt;/del&gt;&lt;/a&gt;): merge stage can now output to the same collection which is being read&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/9e540f7abb79fa052e74fe66c904e39449338704&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/9e540f7abb79fa052e74fe66c904e39449338704&lt;/a&gt;&lt;/p&gt;</comment>
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