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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-45823] Allow multikey index scans to be exploded for sorts</title>
                <link>https://jira.mongodb.org/browse/SERVER-45823</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the planner prevents exploding an index to provide a sort when the sort is on a multikey field. See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/planner_analysis.cpp#L598-L600&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Conceptually there&apos;s no reason we must enforce this restriction. Under certain conditions described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31898&quot; title=&quot;Improve sort analysis to allow multikey indexes to provide sorts when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31898&quot;&gt;&lt;del&gt;SERVER-31898&lt;/del&gt;&lt;/a&gt; we can actually use an index to provide a sort on a multikey field.&lt;/p&gt;

&lt;p&gt;One way to implement this optimization is to change explodeForScan to return a success/fail indicator. After this function builds the index scan node which has point bounds on the first components we can use the existing logic in IndexScanNode to determine whether the sort is actually provided. See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/281973f2c819cd8dcca2b10c0637091ffdcff2c3/src/mongo/db/query/planner_analysis.cpp#L205-L239&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
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        <key id="1118973">SERVER-45823</key>
            <summary>Allow multikey index scans to be exploded for sorts</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="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>qopt-team</label>
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                <created>Tue, 28 Jan 2020 18:25:26 +0000</created>
                <updated>Tue, 6 Dec 2022 02:37:15 +0000</updated>
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