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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>
    </build-info>


<item>
            <title>[DRIVERS-1623] Exact top-n accumulator</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1623</link>
                <project id="10980" key="DRIVERS">Drivers</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;    Please see the scope doc and let Query know if any questions&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;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-color: #cccccc;border-style: dashed;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-style: dashed;border-bottom-color: #cccccc;background-color: #239eb0;&quot;&gt;&lt;b&gt;Epic Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Add a $top accumulator that returns an array of expressions evaluated for top n documents according to a given sort order&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;One common analytical task is to find the top or bottom n elements in each cohort. For example, we are interested in the 10 best salespeople for each region based on their individual sales, or in the 5 slowest queries issued by a given tenant on each day. This is a generalization of finding the best or worst element.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner: Katya Kamenieva&lt;/li&gt;
	&lt;li&gt;Project Lead: TBD&lt;/li&gt;
	&lt;li&gt;Program Manager: Craig Homa&lt;/li&gt;
	&lt;li&gt;Drivers Contact: TBD&lt;/li&gt;
&lt;/ul&gt;


&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.google.com/document/d/1wd04Di9d-Y0yoT2WUfb94zeQd_2zSBzrsg8v2oOOWd4/edit#heading=h.25bcvwewueb7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
 &lt;a href=&quot;http://tinyurl.com/ybcvluqt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;br/&gt;
 &lt;a href=&quot;http://tinyurl.com/y9ov4oaq&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
</description>
                <environment></environment>
        <key id="1656517">DRIVERS-1623</key>
            <summary>Exact top-n accumulator</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Mar 2021 16:52:36 +0000</created>
                <updated>Fri, 27 May 2022 01:25:48 +0000</updated>
                            <resolved>Mon, 5 Apr 2021 18:18:58 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                    <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
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                        <customfieldname>Driver Changes</customfieldname>
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                                <customfieldvalue key="10748"><![CDATA[Needed]]></customfieldvalue>

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                            <customfieldvalue>2|hylyxr:</customfieldvalue>

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                                        <label>5.2</label>
    
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                        <customfieldname>Upstream Changes Summary</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;Here is the list of accumulators that this project implemented:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;$firstN&lt;/li&gt;
	&lt;li&gt;$lastN&lt;/li&gt;
	&lt;li&gt;$minN&lt;/li&gt;
	&lt;li&gt;$maxN&lt;/li&gt;
	&lt;li&gt;$top&lt;/li&gt;
	&lt;li&gt;$topN&lt;/li&gt;
	&lt;li&gt;$bottom&lt;/li&gt;
	&lt;li&gt;$bottomN&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For specific on each accumulator, please refer to the scope doc.&lt;/p&gt;</customfieldvalue>

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