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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-61447] Investigate skipping argument expression evaluation in $group for $first/firstN once accumulator has necessary values</title>
                <link>https://jira.mongodb.org/browse/SERVER-61447</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One idea to improve the performance of a $sort + $first/$firstN pipeline is to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/83064ce82fe014c73126ff59e584337de52ba96f/src/mongo/db/pipeline/document_source_group.cpp#L606-L611&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;skip evaluating the Accumulator &apos;argument&apos; expression for $first/$firstN&lt;/a&gt; if a given AccumulatorState doesn&apos;t need any more input (i.e. when we have 1 or &apos;n&apos; values, respectively). This could potentially save time if it&apos;s expensive to evaluate the argument expression. (note that we can never short circuit $group entirely: as long as we have input documents, there&apos;s a chance that we can start a new group).&lt;/p&gt;

&lt;p&gt;This task should see whether this produces any performance benefits for $first/firstN groups (that is, we need to figure out first whether this yields performance improvements; because you still have to inspect every document that comes into group no matter what, it might be the case that skipping expression evaluation doesn&apos;t save so much time).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1924168">SERVER-61447</key>
            <summary>Investigate skipping argument expression evaluation in $group for $first/firstN once accumulator has necessary values</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                    </labels>
                <created>Fri, 12 Nov 2021 17:33:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:06 +0000</updated>
                            <resolved>Thu, 13 Jan 2022 14:51:13 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4289111" author="xgen-internal-githook" created="Wed, 12 Jan 2022 19:11:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61447&quot; title=&quot;Investigate skipping argument expression evaluation in $group for $first/firstN once accumulator has necessary values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61447&quot;&gt;&lt;del&gt;SERVER-61447&lt;/del&gt;&lt;/a&gt; Skip expression evaluation when AccumulatorFirst/AccumulatorFirstN are full in $group and $bucketAuto&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/36d096e95aa193d08eb934987d6617b65cc1eadf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/36d096e95aa193d08eb934987d6617b65cc1eadf&lt;/a&gt;&lt;/p&gt;</comment>
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