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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-36556] Implement an $indexKeys aggregation stage</title>
                <link>https://jira.mongodb.org/browse/SERVER-36556</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Following discussion around &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35860&quot; title=&quot;Maintain multikey metadata keys for star indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35860&quot;&gt;&lt;del&gt;SERVER-35860&lt;/del&gt;&lt;/a&gt;, we should add a new &lt;tt&gt;$indexKeys&lt;/tt&gt; aggregation stage whose purpose is to return a cursor over the contents of the index. This would essentially be a replacement for the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/cursor.returnKey/#cursor.returnKey&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$returnKey&lt;/tt&gt; query option&lt;/a&gt;, and in the case of &lt;tt&gt;$**&lt;/tt&gt; indexes it would also allow us to examine the index&apos;s metadata keys.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;$indexKeys&lt;/tt&gt; stage would allow integration tests to more closely examine indexing behaviour, and would also be extremely useful for debugging and Support purposes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="586067">SERVER-36556</key>
            <summary>Implement an $indexKeys aggregation stage</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>storch</label>
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                <created>Thu, 9 Aug 2018 16:18:15 +0000</created>
                <updated>Tue, 6 Dec 2022 03:21:41 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Index Maintenance</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
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