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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-12015] Reenable use of covering indexes with aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-12015</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It is not currently possible to use covered indexes with the new query framework without using the full projection code in the non-covered cases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="101666">SERVER-12015</key>
            <summary>Reenable use of covering indexes with aggregation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 Dec 2013 17:07:26 +0000</created>
                <updated>Wed, 3 May 2017 21:20:20 +0000</updated>
                            <resolved>Thu, 27 Aug 2015 17:26:54 +0000</resolved>
                                    <version>2.5.5</version>
                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Performance</component>
                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1016168" author="xgen-internal-githook" created="Thu, 27 Aug 2015 17:21:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;cswanson310&apos;, u&apos;name&apos;: u&apos;Charlie Swanson&apos;, u&apos;email&apos;: u&apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12015&quot; title=&quot;Reenable use of covering indexes with aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12015&quot;&gt;&lt;del&gt;SERVER-12015&lt;/del&gt;&lt;/a&gt; Re-enable use of covering indices in an aggregation pipeline&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/843fd8ae34d06ed73f824c124cd2d9ef7d23b814&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/843fd8ae34d06ed73f824c124cd2d9ef7d23b814&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="472909" author="xgen-internal-githook" created="Thu, 19 Dec 2013 00:11:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11831&quot; title=&quot;Use documentFromBsonWithDeps in agg again&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11831&quot;&gt;&lt;del&gt;SERVER-11831&lt;/del&gt;&lt;/a&gt; Use documentFromBsonWithDeps in agg again&lt;/p&gt;

&lt;p&gt;This bypasses new query framework projection and replaces it with a much faster&lt;br/&gt;
dedicated code path. The downside is that it prevents using covering indexes&lt;br/&gt;
in the cases where that was allowed (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12015&quot; title=&quot;Reenable use of covering indexes with aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12015&quot;&gt;&lt;del&gt;SERVER-12015&lt;/del&gt;&lt;/a&gt;).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3e707bcd22b7c0e8275d25bf8e8b28c3cec4cc67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3e707bcd22b7c0e8275d25bf8e8b28c3cec4cc67&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="319651">DOCS-9011</issuekey>
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            <issuekey id="154608">SERVER-15026</issuekey>
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            <issuekey id="172265">SERVER-16388</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="269109">SERVER-22912</issuekey>
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            <issuekey id="99645">SERVER-11831</issuekey>
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