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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-77574] Relax the sorting requirement for enabling streaming group on timeseries aggregations.</title>
                <link>https://jira.mongodb.org/browse/SERVER-77574</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, streaming $group is only enabled when the user provides a $sort stage on the _id field of the $group. Most accumulators do not have different outputs depending on the order of the input documents.&lt;/p&gt;

&lt;p&gt;When the $group doesn&apos;t depend on the ordering of input documents and the group stage groups on time, we can insert a $sort stage to reorder documents and enable streaming $group.&lt;/p&gt;

&lt;p&gt;As part of this ticket,&lt;br/&gt;
1. Investigate which accumulators do depend on document ordering (at least $firstN and $lastN)&lt;br/&gt;
2. Add code to &lt;a href=&quot;https://github.com/10gen/mongo/blob/6fbfe305e9c6e25f3764c63a5bfe970fa1d78214/src/mongo/db/pipeline/document_source_internal_unpack_bucket.cpp#L1214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DocumentSourceInternalUnpackBucket::doOptimizeAt()&lt;/tt&gt;&lt;/a&gt; directly before the call to &lt;a href=&quot;https://github.com/10gen/mongo/blob/6fbfe305e9c6e25f3764c63a5bfe970fa1d78214/src/mongo/db/pipeline/document_source_internal_unpack_bucket.cpp#L1463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;enableStreamingGroupIfPossible()&lt;/tt&gt;&lt;/a&gt; that will insert a $sort stage on the timeField before the new streaming group stage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2353736">SERVER-77574</key>
            <summary>Relax the sorting requirement for enabling streaming group on timeseries aggregations.</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="davis.haupt@mongodb.com">Davis Haupt</reporter>
                        <labels>
                            <label>qi-timeseries</label>
                    </labels>
                <created>Tue, 30 May 2023 15:37:11 +0000</created>
                <updated>Sat, 3 Feb 2024 01:35:28 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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