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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-53771] $facet should report its summary stats</title>
                <link>https://jira.mongodb.org/browse/SERVER-53771</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;$facet&lt;/b&gt; current does not report its plan summary stats currently. The problem is similar to the work been done on &lt;b&gt;$lookup&lt;/b&gt;, &lt;b&gt;$sort&lt;/b&gt;, and &lt;b&gt;$unionWith.&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The problem of not reporting such stats becomes more visible when $facet is present as a sub-pipeline and the top-level pipeline is been asked to report its aggregated summary stats. In this current scenario, $facet will not be able to report such stats, and hence, the top-level pipeline will also report incorrect stats.&lt;/p&gt;

&lt;p&gt;A client could also ask for stats directly from $facet if it is present as a top-level pipeline and this will also report incorrect stats.&lt;/p&gt;

&lt;p&gt;The infra for the same is already available in the current code-base where each derived document source should override the &lt;b&gt;DocumentSource::getSpecificStats()&lt;/b&gt; method, if required. SpecificStats base class has a helper method &lt;b&gt;accumulate()&lt;/b&gt; which is a convenient method to gather the summary stats from foreign DocumentSources.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;In this ticket, we should utilize the current infra and $facet should start reporting its stats.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1590076">SERVER-53771</key>
            <summary>$facet should report its summary stats</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="bikash.chandra@mongodb.com">Bikash Chandra</assignee>
                                    <reporter username="rishab.joshi@mongodb.com">Rishab Joshi</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 14 Jan 2021 10:32:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:50 +0000</updated>
                            <resolved>Mon, 8 Nov 2021 14:29:00 +0000</resolved>
                                    <version>4.9.0</version>
                                    <fixVersion>5.2.0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4168629" author="xgen-internal-githook" created="Thu, 4 Nov 2021 03:49:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bikash Chandra&apos;, &apos;email&apos;: &apos;bikash.chandra@mongodb.com&apos;, &apos;username&apos;: &apos;bikash-md&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53771&quot; title=&quot;$facet should report its summary stats&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53771&quot;&gt;&lt;del&gt;SERVER-53771&lt;/del&gt;&lt;/a&gt; Facet summary stats added&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e201049a0ddd15704c348863e75d7f1473ae0beb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e201049a0ddd15704c348863e75d7f1473ae0beb&lt;/a&gt;&lt;/p&gt;</comment>
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                            <issuelinktype id="10320">
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            <issuekey id="1928418">DOCS-14941</issuekey>
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            <issuekey id="1576740">SERVER-53501</issuekey>
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            <issuelink>
            <issuekey id="1319733">SERVER-47640</issuekey>
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                            <customfieldvalue>In this ticket, we&amp;#39;ve modified the explain output for aggregations using $facet. If the explain verbosity is {{allPlansExecution}} or above, we will add total aggregate execution stats for the $facet stage to the output. The specific stats are an accumulation of the stats for the sub-stages contained within the $facet, similar to how plan summary stats are shared for $unionWith.</customfieldvalue>

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