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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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            <title>[SERVER-61244] Investigate performance of $group + $top compared to covered $sort + $group + $first plan against timeseries collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-61244</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This should also compare the $group + $top pipeline against the $lookup workaround that exists.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1918274">SERVER-61244</key>
            <summary>Investigate performance of $group + $top compared to covered $sort + $group + $first plan against timeseries collection</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="9">Done</resolution>
                                        <assignee username="ruslan.abdulkhalikov@mongodb.com">Ruslan Abdulkhalikov</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 Nov 2021 15:58:31 +0000</created>
                <updated>Tue, 16 Nov 2021 00:49:00 +0000</updated>
                            <resolved>Tue, 16 Nov 2021 00:49:00 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4179501" author="JIRAUSER1258885" created="Wed, 10 Nov 2021 04:06:56 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pawel.terlecki&quot; class=&quot;user-hover&quot; rel=&quot;pawel.terlecki&quot;&gt;pawel.terlecki&lt;/a&gt;&#160;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;yes, single laptop (and seems like not very fast lol)&lt;/li&gt;
	&lt;li&gt;I think it is warm data since I ran count() first. I can re-test it on cold data to have a better picture&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="4177215" author="pawel.terlecki" created="Tue, 9 Nov 2021 12:29:22 +0000"  >&lt;p&gt;The new optimization is crushing it. Nice.&lt;/p&gt;

&lt;p&gt;1. Is it a single machine test?&lt;/p&gt;

&lt;p&gt;2. Were the measurements taken on cold or warm data caches? It seems to me that all the data should fit in memory in all these cases. If the caches were indeed warm, how could count take a second or $group/topn 14 seconds?&lt;/p&gt;</comment>
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