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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>[DOCS-16286] explain.executionStats.nReturned should be docs returned by the winning plan</title>
                <link>https://jira.mongodb.org/browse/DOCS-16286</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Currently, &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/explain-results/#mongodb-data-explain.executionStats.nReturned&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explain.executionStats.nReturned&lt;/a&gt; reads: Number of documents that match the query condition. It should instead be the number of documents returned by the winning plan. This subtle difference can be seen in the following scenario:&lt;/p&gt;

&lt;p&gt;I have the following docs in my collection:&lt;span class=&quot;error&quot;&gt;&amp;#91;\{a: 1}, \{a: 2}, \{a: 3}&amp;#93;&lt;/span&gt; and run the agg pipeline&#160;&lt;tt&gt;[{$addFields: {&quot;diff&quot;: {$subtract: &lt;span class=&quot;error&quot;&gt;&amp;#91;5, &amp;quot;$a&amp;quot;&amp;#93;&lt;/span&gt;&lt;/tt&gt;}, {$match: {&quot;diff&quot;: {$lte: 2}}}]{}}}, we return 1 doc. When running explain on this aggregate, the winning plan in the case of the classic engine is just &lt;tt&gt;COLLSCAN&lt;/tt&gt;&#160;(without any filter) and&#160;&lt;tt&gt;nReturned&lt;/tt&gt; is 3.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2405306">DOCS-16286</key>
            <summary>explain.executionStats.nReturned should be docs returned by the winning plan</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="matt.maville@mongodb.com">Matthew Maville</assignee>
                                    <reporter username="adi.agrawal@mongodb.com">Adi Agrawal</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>query</label>
                            <label>quick-win</label>
                            <label>request</label>
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                <created>Mon, 31 Jul 2023 16:38:08 +0000</created>
                <updated>Tue, 6 Feb 2024 22:13:06 +0000</updated>
                            <resolved>Tue, 6 Feb 2024 22:13:06 +0000</resolved>
                                                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
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