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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-6253] Covered index not working on sub documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-6253</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a problem with indexes on subdocuments where indexOnly is always false.&lt;/p&gt;

&lt;p&gt;Take this code for example from the Mongo Docs (altered a bit to resemble my problem):&lt;/p&gt;

&lt;p&gt;db.factories.insert( { name: &quot;xyz&quot;, metro: &lt;/p&gt;
{ city: &quot;New York&quot;, state: &quot;NY&quot; }
&lt;p&gt; } );&lt;br/&gt;
db.factories.ensureIndex(&lt;/p&gt;
{&quot;metro.city&quot;:1}
&lt;p&gt;);&lt;br/&gt;
db.factories.find( &lt;/p&gt;
{ &quot;metro.city&quot; : &quot;New York&quot; }
&lt;p&gt;, {_id:0, &quot;metro.city&quot; : 1} ).explain();&lt;br/&gt;
Output:&lt;br/&gt;
{&lt;br/&gt;
	&quot;cursor&quot; : &quot;BtreeCursor metro.city_1&quot;,&lt;br/&gt;
	&quot;nscanned&quot; : 1,&lt;br/&gt;
	&quot;nscannedObjects&quot; : 1,&lt;br/&gt;
	&quot;n&quot; : 1,&lt;br/&gt;
	&quot;millis&quot; : 0,&lt;br/&gt;
	&quot;nYields&quot; : 0,&lt;br/&gt;
	&quot;nChunkSkips&quot; : 0,&lt;br/&gt;
	&quot;isMultiKey&quot; : false,&lt;br/&gt;
	&quot;indexOnly&quot; : false,&lt;br/&gt;
	&quot;indexBounds&quot; : &lt;/p&gt;
{
		&quot;metro.city&quot; : [
			[
				&quot;New York&quot;,
				&quot;New York&quot;
			]
		]
	}
&lt;p&gt;}&lt;/p&gt;

&lt;p&gt;Notice the indexOnly is false although an index is used and only indexed values should be returned. Hence  the {_id:0, &quot;metro.city&quot; : 1} part.&lt;br/&gt;
Is this because the more than just the metro.city is returned? { &quot;metro&quot; : &lt;/p&gt;
{ &quot;city&quot; : &quot;New York&quot; }
&lt;p&gt; }&lt;br/&gt;
Anybody any idea how I can make sure indexOnly becomes true in this situation?&lt;/p&gt;</description>
                <environment></environment>
        <key id="42880">SERVER-6253</key>
            <summary>Covered index not working on sub documents</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="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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="renedekat">Ren&#233; de Kat</reporter>
                        <labels>
                    </labels>
                <created>Fri, 29 Jun 2012 19:31:02 +0000</created>
                <updated>Wed, 15 Aug 2012 14:04:20 +0000</updated>
                            <resolved>Fri, 29 Jun 2012 19:35:19 +0000</resolved>
                                    <version>2.0.5</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="138074" author="scotthernandez" created="Fri, 29 Jun 2012 19:35:19 +0000"  >&lt;p&gt;Dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2104&quot; title=&quot;covered index should support dotted fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2104&quot;&gt;&lt;del&gt;SERVER-2104&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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