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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-60481] Fix perf issue with $sum accumulator in $group pushed down to SBE</title>
                <link>https://jira.mongodb.org/browse/SERVER-60481</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$group accumulators keep accumulating values per each value entering a group. While accumulating, the accumulator implementation may keep allocating a new accumulated value to accumulate the new value and the previous accumulated value.&lt;/p&gt;

&lt;p&gt;If the accumulated value is primitive type, this behavior may be ok but if the accumulated value happen to be a complex type like&#160;&lt;tt&gt;Array&lt;/tt&gt;,&#160;&lt;tt&gt;Object&lt;/tt&gt;, or&#160;&lt;tt&gt;ArraySet&lt;/tt&gt;, then this behavior is highly likely to hurt $group performance in SBE.&lt;/p&gt;

&lt;p&gt;$sum is such an example.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1890511">SERVER-60481</key>
            <summary>Fix perf issue with $sum accumulator in $group pushed down to SBE</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="martin.neupauer@mongodb.com">Martin Neupauer</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 Oct 2021 20:37:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:47:46 +0000</updated>
                            <resolved>Thu, 7 Oct 2021 15:47:07 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4110520" author="xgen-internal-githook" created="Thu, 7 Oct 2021 15:42:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Martin Neupauer&apos;, &apos;email&apos;: &apos;martin.neupauer@mongodb.com&apos;, &apos;username&apos;: &apos;MartinNeupauer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60481&quot; title=&quot;Fix perf issue with $sum accumulator in $group pushed down to SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60481&quot;&gt;&lt;del&gt;SERVER-60481&lt;/del&gt;&lt;/a&gt; Fix perf issue with $sum accumulator in $group pushed down to SBE&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6f82df6d9d03173d34b1a4dc92cef977fad3e7cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6f82df6d9d03173d34b1a4dc92cef977fad3e7cf&lt;/a&gt;&lt;/p&gt;</comment>
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