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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-12330] Docs for SERVER-38362: Prevent $out stage within $lookup</title>
                <link>https://jira.mongodb.org/browse/DOCS-12330</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;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;Document that $out in $lookup is banned. Mention this in release notes for 4.2, as $out in $lookup is allowed in 4.0. &lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;After debating this point during the design of the new $out features, we eventually decided to disallow this combination in any scenario, not just for views as was done in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35419&quot; title=&quot;Make diskRequirement in StageConstraints in DocumentSource reflect child pipeline requirements.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35419&quot;&gt;&lt;del&gt;SERVER-35419&lt;/del&gt;&lt;/a&gt; + &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34902&quot; title=&quot;view definitions should *not* allow $out as a stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34902&quot;&gt;&lt;del&gt;SERVER-34902&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;&lt;/blockquote&gt;

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

&lt;ul&gt;
	&lt;li&gt;$lookup &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;$out &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;&lt;del&gt;Modify the blurb for views restrictions&lt;/del&gt; Actually, it doesn&apos;t read well in the extract and is kind of distracting.  The blurb already covers it, so will skip for now.&lt;/li&gt;
	&lt;li&gt;&lt;del&gt;Restrictions page&lt;/del&gt; Actually, we don&apos;t quite do this for specific agg operators (so to prevent confusion as to this is the only limitation, will skip for now)&lt;/li&gt;
	&lt;li&gt;4.2 compatibility &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/check.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/li&gt;
	&lt;li&gt;&lt;del&gt;Check downgrade&lt;/del&gt; Actually, since we already cover for views and its definition, we should be good since there shouldn&apos;t have other persisted features that incorporate lookup.&lt;/li&gt;
&lt;/ul&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;
</description>
                <environment></environment>
        <key id="667159">DOCS-12330</key>
            <summary>Docs for SERVER-38362: Prevent $out stage within $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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Jan 2019 21:19:52 +0000</created>
                <updated>Mon, 13 Nov 2023 18:27:40 +0000</updated>
                            <resolved>Fri, 11 Jan 2019 15:46:18 +0000</resolved>
                                                    <fixVersion>4.1.7</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="2112312" author="xgen-internal-githook" created="Fri, 11 Jan 2019 15:46:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@mongodb.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12330&quot; title=&quot;Docs for SERVER-38362: Prevent $out stage within $lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12330&quot;&gt;&lt;del&gt;DOCS-12330&lt;/del&gt;&lt;/a&gt;: $out and $limit restrictions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/82ee1d436c0bd1eda37ed947c2e539aa24d876ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/82ee1d436c0bd1eda37ed947c2e539aa24d876ea&lt;/a&gt;&lt;/p&gt;</comment>
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