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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-9937] Update docs to reflect multikey covering improvements</title>
                <link>https://jira.mongodb.org/browse/DOCS-9937</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3173&quot; title=&quot;Planner should use path-level multikey info to generate covered plans when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3173&quot;&gt;&lt;del&gt;SERVER-3173&lt;/del&gt;&lt;/a&gt;, fixed in development release 3.5.2, allowed mongod&apos;s query system to produce covered plans in some cases for multikey indexes. &lt;a href=&quot;https://docs.mongodb.com/manual/core/query-optimization/#restrictions-on-indexed-fields&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Previously existing documentation&lt;/a&gt; mentions that covering is not possible for multikey indexes:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;An index cannot cover a query if... any of the indexed fields in any of the documents in the collection includes an array. If an indexed field is an array, the index becomes a multi-key index and cannot support a covered query.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This is no longer true. The fix for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3173&quot; title=&quot;Planner should use path-level multikey info to generate covered plans when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3173&quot;&gt;&lt;del&gt;SERVER-3173&lt;/del&gt;&lt;/a&gt; takes advantage of improvements added under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15086&quot; title=&quot;Allow for efficient range queries over non-array fields in multikey indices&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15086&quot;&gt;&lt;del&gt;SERVER-15086&lt;/del&gt;&lt;/a&gt; in which the server tracks metadata about which indexed fields are multikey. This metadata is available for indexes built on a 3.4 or newer version using any storage engine other than MMAPv1. When this info is available, the planner can now generate covered plans over the non-array fields of a multikey index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="356976">DOCS-9937</key>
            <summary>Update docs to reflect multikey covering improvements</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="9">Done</resolution>
                                        <assignee username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>future-docs</label>
                    </labels>
                <created>Fri, 24 Feb 2017 16:24:25 +0000</created>
                <updated>Thu, 21 Sep 2017 20:33:55 +0000</updated>
                            <resolved>Mon, 18 Sep 2017 15:05:49 +0000</resolved>
                                                    <fixVersion>3.5.2</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
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