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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20117] Allow queries with a sort routed through mongos to be covered in the new mongos read path</title>
                <link>https://jira.mongodb.org/browse/SERVER-20117</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19355&quot; title=&quot;Support skip, limit, and projection in new find/getMore commands path on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19355&quot;&gt;&lt;del&gt;SERVER-19355&lt;/del&gt;&lt;/a&gt; introduced a sortKey $meta projection which mongos will issue to mongod in order to accomplish a sort. This meta-projection instructs mongod to add the sort key it used to each document in the result set; mongos can then use this sort key to perform its sorted merge.&lt;/p&gt;

&lt;p&gt;Currently specifying a sortKey $meta projection will always cause the query planner to generated non-covered plans. This means that the find/getMore commands path on mongos currently cannot use index-only query execution on the shards if there is a user-specified sort. In order to support covered sort queries, we would need to allow sortKey $meta projection to work on index key data in addition to fetched data.&lt;/p&gt;</description>
                <environment></environment>
        <key id="227031">SERVER-20117</key>
            <summary>Allow queries with a sort routed through mongos to be covered in the new mongos read path</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="yunhe.wang">YunHe Wang</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Aug 2015 19:45:32 +0000</created>
                <updated>Thu, 15 Oct 2015 19:08:19 +0000</updated>
                            <resolved>Mon, 12 Oct 2015 17:54:51 +0000</resolved>
                                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1058192" author="xgen-internal-githook" created="Mon, 12 Oct 2015 17:52:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;yhjw88&apos;, u&apos;name&apos;: u&apos;Yunhe (John) Wang&apos;, u&apos;email&apos;: u&apos;yunhe.wang@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20117&quot; title=&quot;Allow queries with a sort routed through mongos to be covered in the new mongos read path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20117&quot;&gt;&lt;del&gt;SERVER-20117&lt;/del&gt;&lt;/a&gt; Allow queries with meta sortkey to be covered in mongos&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/28a2d6fa3f7fb6659f578d69e6d772ae9be8c25e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/28a2d6fa3f7fb6659f578d69e6d772ae9be8c25e&lt;/a&gt;&lt;/p&gt;</comment>
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