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    <title>MongoDB Jira</title>
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    <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-83529] Generate covered projections with $expr</title>
                <link>https://jira.mongodb.org/browse/SERVER-83529</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;if we are using $expr, we don&#8217;t produce covered projections.&lt;/p&gt;

&lt;p&gt;If index on a is present,&lt;/p&gt;

&lt;p&gt;This will have fetch + projection simple&lt;br/&gt;
db.test.explain().aggregate([{$match: {$expr: {$eq: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;quot;$a&amp;quot;, 1&amp;#93;&lt;/span&gt;}}}, {$project: {_id: 0, a: 1}}])&lt;/p&gt;

&lt;p&gt;But this will have projection covered:&lt;br/&gt;
db.test.explain().aggregate(&lt;span class=&quot;error&quot;&gt;&amp;#91;\{$match: {a: 1}}, \{$project: {_id: 0, a: 1}}&amp;#93;&lt;/span&gt;)&lt;/p&gt;

&lt;p&gt;It looks like a problem with dependency analysis of $expr that can&#8217;t determine that we only need field &#8220;a&#8221; that can come from the index.&lt;/p&gt;

&lt;p&gt;In some cases we have to use $expr syntax. For example, in $lookup with pipelines.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2507293">SERVER-83529</key>
            <summary>Generate covered projections with $expr</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="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Nov 2023 13:15:49 +0000</created>
                <updated>Tue, 12 Dec 2023 14:32:32 +0000</updated>
                            <resolved>Thu, 23 Nov 2023 09:32:46 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5901024" author="JIRAUSER1270969" created="Thu, 23 Nov 2023 09:33:17 +0000"  >&lt;p&gt;Closing this as a duplicate&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2522654">SERVER-84094</issuekey>
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                            <issuelinktype id="10010">
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