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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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            <title>[SERVER-82168] Make window function $rank/$denseRank consistent on handling null and missing</title>
                <link>https://jira.mongodb.org/browse/SERVER-82168</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, $rank and $denseRank treat null and missing differently, which causes a field to change from null to missing, or vice versa to a rank increment. This is not consistent with $sort behavior, which treats null and missing the same. This causes the rank result to be unstable.&lt;/p&gt;

&lt;p&gt;The SBE implementation currently copies the Classic semantics. When we update the semantics, we should update in both engines. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2473653">SERVER-82168</key>
            <summary>Make window function $rank/$denseRank consistent on handling null and missing</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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="rui.liu@mongodb.com">Rui Liu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Oct 2023 11:31:44 +0000</created>
                <updated>Wed, 7 Feb 2024 12:25:19 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="6074670" author="xgen-internal-githook" created="Wed, 7 Feb 2024 12:25:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;33423526+lriuui0x0@users.noreply.github.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82168&quot; title=&quot;Make window function $rank/$denseRank consistent on handling null and missing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82168&quot;&gt;SERVER-82168&lt;/a&gt; Make $rank/$denseRank treat null/missing the same (#17911)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 74aa440c55a1e3f4910a6ce99bb3efe81a86514d&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4766e2eebde3cd796f621a28ce23f0734bf5781c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4766e2eebde3cd796f621a28ce23f0734bf5781c&lt;/a&gt;&lt;/p&gt;</comment>
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