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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>[SERVER-36047] (Sharded target collection) Enforce existence of unique index containing fields of $out uniqueKey</title>
                <link>https://jira.mongodb.org/browse/SERVER-36047</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At aggregation planning time, we should acquire the appropriate locks and assert that there exists a unique index that contains all of the fields on the uniqueKey (where order of the fields does not matter).&lt;/p&gt;

&lt;p&gt;If the uniqueKey is the document key, we &lt;b&gt;must&lt;/b&gt; elide the check. The &quot;document key&quot; is&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;the _id for an unsharded collection&lt;/li&gt;
	&lt;li&gt;the _id and all the fields of the shard key for a sharded collection&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If the output collection is sharded, the uniqueKey must contain all of the fields of the shard key, and there must exist a unique index containing exactly the remaining fields. For example, for a collection sharded on {x: 1} and a uniqueKey {x: 1, y: 1, z: 1}, we must enforce the existence of a unique index containing exactly the fields &quot;x&quot;, &quot;y&quot; and &quot;z&quot; (in no particular order).&lt;/p&gt;

&lt;p&gt;This work should already be done for unsharded collections in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36424&quot; title=&quot;Make sure $out&amp;#39;s uniqueKey is unique when target collection is unsharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36424&quot;&gt;&lt;del&gt;SERVER-36424&lt;/del&gt;&lt;/a&gt;, this ticket represents the work to make this happen when the target collection is sharded. &lt;/p&gt;</description>
                <environment></environment>
        <key id="569811">SERVER-36047</key>
            <summary>(Sharded target collection) Enforce existence of unique index containing fields of $out uniqueKey</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="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Jul 2018 15:45:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:59 +0000</updated>
                            <resolved>Fri, 21 Sep 2018 18:39:34 +0000</resolved>
                                                    <fixVersion>4.1.4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2010788" author="xgen-internal-githook" created="Fri, 21 Sep 2018 18:39:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nick Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36047&quot; title=&quot;(Sharded target collection) Enforce existence of unique index containing fields of $out uniqueKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36047&quot;&gt;&lt;del&gt;SERVER-36047&lt;/del&gt;&lt;/a&gt;: Enforce existence of unique index containing fields of $out uniqueKey for sharded collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3ef020ad55fa407241f503ff4c2a8af59ef181df&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3ef020ad55fa407241f503ff4c2a8af59ef181df&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1971390" author="kyle.suarez" created="Thu, 9 Aug 2018 14:13:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt; interested in taking this on?&lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="567554">SERVER-35954</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="581569">SERVER-36424</issuekey>
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                                        <issuelink>
            <issuekey id="565413">SERVER-35896</issuekey>
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            <issuelink>
            <issuekey id="577003">SERVER-36318</issuekey>
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