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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-56572] Allow ranking-style window functions over a compound set of sortBy fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-56572</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Ranking-style functions are currently only allowed with single-field sortBy specs, since the implementation re-uses existing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/accumulator_rank.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;accumulator machinery&lt;/a&gt; under the hood which operates over single values at a time. &lt;/p&gt;

&lt;p&gt;One potential workaround is to prepend an $addFields stage that places the compound set of fields into their own sub-object, then applying the window function rank on that new object.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1699484">SERVER-56572</key>
            <summary>Allow ranking-style window functions over a compound set of sortBy fields</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
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                <created>Mon, 3 May 2021 16:17:23 +0000</created>
                <updated>Tue, 9 Jan 2024 17:52:04 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5997979" author="JIRAUSER1276788" created="Tue, 9 Jan 2024 17:52:04 +0000"  >&lt;p&gt;It&apos;s a major issue for us not to be able to use rank and $documentNumber when sorting on multiple fields&lt;/p&gt;</comment>
                            <comment id="4365751" author="JIRAUSER1265005" created="Sun, 20 Feb 2022 05:08:26 +0000"  >&lt;p&gt;Hi, this issue is something that&apos;s preventing us from upgrading to MongoDB 5.0, we&apos;d love to make use of the $rank feature but not being able to specify multiple sort fields is kind of a non-starter for us as it means we can&apos;t use another field for breaking ties. Is this something that is likely to be implemented soon?&lt;/p&gt;</comment>
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