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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-75508] Optimize streaming $group</title>
                <link>https://jira.mongodb.org/browse/SERVER-75508</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We introduced streaming $group for time-series collections when $group _id is on time under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70267&quot; title=&quot;Streaming group when id is on time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70267&quot;&gt;&lt;del&gt;SERVER-70267&lt;/del&gt;&lt;/a&gt;. We could take this further for the firstN accumulator by:&lt;/p&gt;

&lt;p&gt;1) Short-cutting accumulation for a single _id value when N results are found&lt;/p&gt;

&lt;p&gt;2) Extending this optimization when _id is null, short-cutting when N results are found&lt;/p&gt;

&lt;p&gt;As part of this ticket we should also consider the following, and either include in scope or create new tickets for them if they make sense:&lt;/p&gt;

&lt;p&gt;1) Allow this short cut mechanism for firstN outside of time-series when possible&lt;/p&gt;

&lt;p&gt;2) Extend the time-series use case to lastN when/if possible (this would require a reverse scan)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2302218">SERVER-75508</key>
            <summary>Optimize streaming $group</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                            <label>qi-timeseries</label>
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                <created>Thu, 30 Mar 2023 16:04:31 +0000</created>
                <updated>Sat, 3 Feb 2024 01:35:55 +0000</updated>
                                                                                                <votes>0</votes>
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            <issuekey id="2353736">SERVER-77574</issuekey>
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