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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-11807] Docs for SERVER-34902: view definitions should *not* allow $out as a stage</title>
                <link>https://jira.mongodb.org/browse/DOCS-11807</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h2&gt;

&lt;p&gt;1. `$out` is now disallowed in the pipeline for a view.&lt;br/&gt;
2. Now, when creating a new view, the create function may not insert a valid view. This is because inserting a new view will cause the view catalog to be rebuilt (and reverified). If an existing invalid view (e.g. one that contains a `$out` pipeline stage) exists, then the server will error before inserting the new view.&lt;br/&gt;
Because using an existing view doesn&apos;t cause the view catalog to be verified, users will not be alerted  while using the existing, invalid view. This behavior we believe would be unexpected and should be documented. &lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h2&gt;

&lt;p&gt;We seem to allow $out stage as part of view definition.&lt;/p&gt;

&lt;p&gt;This is problematic for several reasons.  One is that trying to append any stages (i.e. doing &lt;b&gt;anything&lt;/b&gt; other than a simple find() on this view) will fail.  The other is that running find on this view will blow away whatever is in the collection named in &quot;$out&quot; which is not an obvious outcome and unlikely to have a valid use case for it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="560477">DOCS-11807</key>
            <summary>Docs for SERVER-34902: view definitions should *not* allow $out as a stage</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>
                            <label>neweng</label>
                            <label>read-only-views</label>
                    </labels>
                <created>Sun, 17 Jun 2018 19:43:42 +0000</created>
                <updated>Mon, 13 Nov 2023 18:34:05 +0000</updated>
                            <resolved>Tue, 23 Oct 2018 22:20:22 +0000</resolved>
                                                    <fixVersion>4.1.1</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="2039892" author="xgen-internal-githook" created="Tue, 23 Oct 2018 22:20:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11807&quot; title=&quot;Docs for SERVER-34902: view definitions should *not* allow $out as a stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11807&quot;&gt;&lt;del&gt;DOCS-11807&lt;/del&gt;&lt;/a&gt;: view pipeline and  stage restrictions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/b6e10f92e508f1c9504f0e006ef0138db9fc7e21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/b6e10f92e508f1c9504f0e006ef0138db9fc7e21&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="610851">DOCS-12086</issuekey>
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