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            <title>[SERVER-60535] Investigate use of merging algorithm for ordered multi accumulators </title>
                <link>https://jira.mongodb.org/browse/SERVER-60535</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/accumulator_multi.cpp#L118-L129&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;AccumulatorN::processInternal naively combines elements one at a time when merging partial results&lt;/a&gt; (e.g inserting each element one at a time). For $firstN/$lastN, this is ok, but in the case of the ordered accumulators, we can potentially improve this using the &apos;merge sorted lists&apos; algorithm. This task should investigate whether this algorithm provides any perf benefits (we should explore this after we have perf coverage for all of the ordered accumulators). &lt;/p&gt;

&lt;p&gt;For small &apos;n&apos; (i.e. n &amp;lt;= 10), this might not make a big difference, but for larger &apos;n&apos;, it could save some work.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1892766">SERVER-60535</key>
            <summary>Investigate use of merging algorithm for ordered multi 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="12300">Won&apos;t Do</resolution>
                                        <assignee username="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
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                <created>Thu, 7 Oct 2021 16:37:36 +0000</created>
                <updated>Tue, 9 Nov 2021 16:52:29 +0000</updated>
                            <resolved>Tue, 9 Nov 2021 16:52:29 +0000</resolved>
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