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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>[SERVER-45529] Implement and test invalid usage of $unionWith aggregation stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-45529</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul&gt;
	&lt;li&gt;$unionWith is not allowed to read from a sharded collection if it is part of the inner pipeline of a $lookup.&lt;/li&gt;
	&lt;li&gt;Disallowed within an update pipeline&lt;/li&gt;
	&lt;li&gt;Disallowed alongside a $changeStream&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The sub-pipeline has the following restrictions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Cannot contain stages which write data ($merge, $out).&lt;/li&gt;
	&lt;li&gt;Cannot contain a $changeStream stage, or any collection-less aggregation stage.&lt;/li&gt;
	&lt;li&gt;Cannot contain a stage which must run on mongos or the local host that the command was sent. At the moment, the only relevant stages are $listCachedAndActiveUsers, $listLocalSessions, $currentOp with localOps: true, and several internal change stream stages.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1088569">SERVER-45529</key>
            <summary>Implement and test invalid usage of $unionWith aggregation 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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 13 Jan 2020 21:23:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:22 +0000</updated>
                            <resolved>Thu, 6 Feb 2020 19:48:41 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2814065" author="xgen-internal-githook" created="Thu, 6 Feb 2020 18:34:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45529&quot; title=&quot;Implement and test invalid usage of $unionWith aggregation stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45529&quot;&gt;&lt;del&gt;SERVER-45529&lt;/del&gt;&lt;/a&gt; Add new stage constraint for $unionWith sub-pipeline&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/17d9a4f0a2b5ccec16edd50d0137bd0e83134661&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/17d9a4f0a2b5ccec16edd50d0137bd0e83134661&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2814061" author="xgen-internal-githook" created="Thu, 6 Feb 2020 18:34:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45529&quot; title=&quot;Implement and test invalid usage of $unionWith aggregation stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45529&quot;&gt;&lt;del&gt;SERVER-45529&lt;/del&gt;&lt;/a&gt; Add new stage constraint for $unionWith sub-pipeline&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/171f3ce906cdc7d8093996fe19462e54451db5b7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/171f3ce906cdc7d8093996fe19462e54451db5b7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2724588" author="nicholas.zolnierz" created="Tue, 14 Jan 2020 15:56:34 +0000"  >&lt;p&gt;To add to the list above, we should add a test for $lookup on a view spec with $unionWith and verify that it fails if the union&apos;ed collection is sharded.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1079634">SERVER-45399</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1110156">SERVER-45712</issuekey>
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