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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-20092] Add ability for DocumentSourceCursor to coalesce with a $project stage if it is doing an equivalent projection</title>
                <link>https://jira.mongodb.org/browse/SERVER-20092</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once &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; is fixed, the cursor stage will have the ability to handle a simple inclusion projection itself. If the cursor source has a projection, and there is a $project stage in the pipeline with the same specification, we should be able to remove it.&lt;/p&gt;

&lt;p&gt;Note this might get messy/complicated in terms of nested projection objects, particularly when including sub-fields of _id.&lt;/p&gt;</description>
                <environment></environment>
        <key id="226802">SERVER-20092</key>
            <summary>Add ability for DocumentSourceCursor to coalesce with a $project stage if it is doing an equivalent projection</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="9">Done</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>optimization</label>
                    </labels>
                <created>Mon, 24 Aug 2015 16:02:04 +0000</created>
                <updated>Wed, 6 Dec 2017 21:15:59 +0000</updated>
                            <resolved>Wed, 24 May 2017 13:46:23 +0000</resolved>
                                                    <fixVersion>3.5.8</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1578372" author="xgen-internal-githook" created="Tue, 23 May 2017 22:42:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;nzolnierzmdb&apos;, u&apos;name&apos;: u&apos;Nick Zolnierz&apos;, u&apos;email&apos;: u&apos;nicholas.zolnierz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20092&quot; title=&quot;Add ability for DocumentSourceCursor to coalesce with a $project stage if it is doing an equivalent projection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20092&quot;&gt;&lt;del&gt;SERVER-20092&lt;/del&gt;&lt;/a&gt;: Add ability for DocumentSourceCursor to coalesce with a  stage if it is doing an equivalent projection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/824f61af05cee3ec76986b28867b02659c0045b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/824f61af05cee3ec76986b28867b02659c0045b4&lt;/a&gt;&lt;/p&gt;</comment>
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