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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-59070] SBE support for $group in &apos;needsMerge&apos; state</title>
                <link>https://jira.mongodb.org/browse/SERVER-59070</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a &apos;global&apos; $group is run that is split across multiple mongods, a different SBE plan must be generated, so that the output may be collected on the merging node.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1839990">SERVER-59070</key>
            <summary>SBE support for $group in &apos;needsMerge&apos; state</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Aug 2021 18:26:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:58 +0000</updated>
                            <resolved>Tue, 19 Oct 2021 21:55:03 +0000</resolved>
                                                    <fixVersion>5.2.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4110996" author="JIRAUSER1258488" created="Thu, 7 Oct 2021 18:02:42 +0000"  >&lt;p&gt;Ian&apos;s clarification on the scope:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;running the mongod-side using SBE and continuing to use the classic engine on mongos for re-grouping the partially accumulated results&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="4104026" author="JIRAUSER1258488" created="Wed, 6 Oct 2021 00:06:24 +0000"  >&lt;p&gt;IIUC, the support for merge in $group pushdown is all about how each accumulator merges partial aggregation results from multiple shards at the mongo*S*-side and how each accumulator produces partial aggregation results at the shard-side.&lt;/p&gt;

&lt;p&gt;One quite interesting aspect is that for example, $avg, we may need the finalization step and a different accumulation step at the mongo*S*-side, and we need accumulation steps and the finalization steps for both $sum and $count but not the normal $avg finalization step at the shard-side.&lt;/p&gt;

&lt;p&gt;Another interesting question is would we return the fully-materialized BSON object for the partial aggregation results or just return the partial aggregation results as a mixed-type array and we find relevant elements by their positions to save some (de)serialization overhead and network bandwidth. For example, $avg, we may want to return &lt;span class=&quot;error&quot;&gt;&amp;#91;partial_sum, partial_count&amp;#93;&lt;/span&gt; instead of {&#8220;s&#8221;: partial_sum, &#8220;c&#8221;: partial_count} for partial $avg results.&lt;/p&gt;</comment>
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