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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-22182] Compound index not used for sort if sort spec doesn&apos;t match index spec, even with equality predicate on sort prefix</title>
                <link>https://jira.mongodb.org/browse/SERVER-22182</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The query planner elects to use a blocking sort for queries where the sort spec doesn&apos;t match the index spec, even in the case where there is an equality match predicate on some prefix of the sort spec.  In this special case a sort is only truly required on the remaining suffix of the sort spec, for which the index could possibly be used.  For example, with an index on {&lt;tt&gt;a:1,b:1&lt;/tt&gt;}:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;tt&gt;db.foo.find({a:2}).sort({a:1,b:1})&lt;/tt&gt;  - sort uses the index&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.foo.find({a:2}).sort({a:-1,b:1})&lt;/tt&gt; - blocking sort&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.foo.find({a:2}).sort({a:-1,b:-1})&lt;/tt&gt;  - sort uses the index&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;db.foo.find({a:2}).sort({a:1,b:-1})&lt;/tt&gt; - blocking sort&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Logically, query 2 is the same as 1, and query 4 is the same as 3&lt;/p&gt;</description>
                <environment></environment>
        <key id="247107">SERVER-22182</key>
            <summary>Compound index not used for sort if sort spec doesn&apos;t match index spec, even with equality predicate on sort prefix</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="jon.rangel@mongodb.com">Jon Rangel</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Thu, 14 Jan 2016 12:15:45 +0000</created>
                <updated>Tue, 6 Dec 2022 04:35:58 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>2</votes>
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