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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>[SERVER-57880] Implement $top, $topN, $bottom, and $bottomN accumulators</title>
                <link>https://jira.mongodb.org/browse/SERVER-57880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1791586">SERVER-57880</key>
            <summary>Implement $top, $topN, $bottom, and $bottomN accumulators</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="13201">Fixed</resolution>
                                        <assignee username="mickey.winters@mongodb.com">Mickey Winters</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Jun 2021 17:42:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:50 +0000</updated>
                            <resolved>Wed, 20 Oct 2021 19:43:01 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4136376" author="xgen-internal-githook" created="Wed, 20 Oct 2021 19:38:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mickey. J Winters&apos;, &apos;email&apos;: &apos;mickey.winters@mongodb.com&apos;, &apos;username&apos;: &apos;mjrb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57880&quot; title=&quot;Implement $top, $topN, $bottom, and $bottomN accumulators&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57880&quot;&gt;&lt;del&gt;SERVER-57880&lt;/del&gt;&lt;/a&gt; Implement $top, $topN, $bottom, and $bottomN accumulators&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1c5b61079bf081df648f3ce91c42bd5d9fd9d8c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1c5b61079bf081df648f3ce91c42bd5d9fd9d8c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4037986" author="pawel.terlecki" created="Thu, 2 Sep 2021 21:31:42 +0000"  >&lt;p&gt;I think you are right. It may be a premature optimization. In this case I see how it does not make sense to split this ticket.&lt;/p&gt;</comment>
                            <comment id="4036412" author="kyle.suarez" created="Thu, 2 Sep 2021 14:22:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mickey.winters&quot; class=&quot;user-hover&quot; rel=&quot;mickey.winters&quot;&gt;mickey.winters&lt;/a&gt; and I discussed this at top-n standup and sprint planning. With Mickey&apos;s current implementation, we are not sure if a more specialized version for top is going to be that much faster than the proposed plan for topN in the attached pull request. Our plan is to prioritize benchmarks for these accumulators in PERF-2486 and then use those perf numbers to see if we can gain a noticeable improvement.&lt;/p&gt;</comment>
                            <comment id="4035676" author="pawel.terlecki" created="Thu, 2 Sep 2021 06:39:19 +0000"  >&lt;p&gt;For perf reasons, I feel that top and topN should have different implementations. Analogously, bottom and bottomN.&lt;/p&gt;

&lt;p&gt;Btw. after shipping time-series top and bottom turned out to be highly requested features as they are much faster than first and last if indexes are not available. Maybe it is worth splitting this ticket to two and shipping $top and $bottom first.&lt;/p&gt;

&lt;p&gt;cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kyle.suarez&quot; class=&quot;user-hover&quot; rel=&quot;kyle.suarez&quot;&gt;kyle.suarez&lt;/a&gt;&lt;/p&gt;</comment>
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