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    <title>MongoDB Jira</title>
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    <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>[DOCS-14941] [SERVER] Investigate changes in SERVER-53771: $facet should report its summary stats</title>
                <link>https://jira.mongodb.org/browse/DOCS-14941</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    In this ticket, we&apos;ve modified the explain output for aggregations using $facet. If the explain verbosity is &lt;tt&gt;allPlansExecution&lt;/tt&gt; 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.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&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="1928418">DOCS-14941</key>
            <summary>[SERVER] Investigate changes in SERVER-53771: $facet should report its summary stats</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Nov 2021 14:28:34 +0000</created>
                <updated>Mon, 13 Nov 2023 17:46:53 +0000</updated>
                            <resolved>Thu, 11 May 2023 20:57:54 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5419144" author="JIRAUSER1264463" created="Thu, 11 May 2023 20:57:54 +0000"  >&lt;p&gt;I am closing this ticket due to the age of the ticket and because of the relatively small user impact of the requested documentation.&#160;&lt;/p&gt;</comment>
                            <comment id="4197523" author="dbeng-pm-bot" created="Thu, 18 Nov 2021 14:28:45 +0000"  >&lt;p&gt;&lt;em&gt;Downstream changes updated for upstream &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;:&lt;/em&gt; &lt;br/&gt;
In this ticket, we&apos;ve modified the explain output for aggregations using $facet. If the explain verbosity is &lt;tt&gt;allPlansExecution&lt;/tt&gt; 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.&lt;/p&gt;</comment>
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