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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3758] push limit down into index scan for sort + limit queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-3758</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;index {a:1,b:1}&lt;br/&gt;
find( {a:{$gte:2,$lte:4}} ).sort( {b:1} ).limit(5)&lt;/p&gt;

&lt;p&gt;There is a missing optimization for the query above. The query engine could scan only the first 5 values of &lt;tt&gt;b&lt;/tt&gt; for each value of &lt;tt&gt;a&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3122&quot; title=&quot;Range queries on compound indexes involve unnecessary scanning when sorting and limit are involved&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3122&quot;&gt;&lt;del&gt;SERVER-3122&lt;/del&gt;&lt;/a&gt; for initial description and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3310&quot; title=&quot;Query optimizer should efficiently handle $in and sort with compound index.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3310&quot;&gt;&lt;del&gt;SERVER-3310&lt;/del&gt;&lt;/a&gt; for a related case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="21860">SERVER-3758</key>
            <summary>push limit down into index scan for sort + limit queries</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="aaron">Aaron Staple</reporter>
                        <labels>
                            <label>query_triage</label>
                    </labels>
                <created>Sun, 4 Sep 2011 22:35:55 +0000</created>
                <updated>Tue, 6 Dec 2022 05:40:59 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>5</votes>
                                    <watches>11</watches>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="80321">SERVER-10026</issuekey>
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            <issuekey id="18552">SERVER-3310</issuekey>
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                <attachments>
                            <attachment id="35315" name="server3758.js" size="632" author="benety.goh@mongodb.com" created="Thu, 12 Dec 2013 17:17:45 +0000"/>
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