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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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<item>
            <title>[SERVER-10728] Query optimizer should consider the projection when selecting a plan</title>
                <link>https://jira.mongodb.org/browse/SERVER-10728</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Given indexes: &lt;/p&gt;
{ a: 1, b: 1 }
&lt;p&gt; and &lt;/p&gt;
{ a: 1, c: 1 }
&lt;p&gt;, a range query on &apos;a&apos; with a projection on &lt;/p&gt;
{ a: 1, c: 1, _id: 0 }
&lt;p&gt; will choose the non-covering index &lt;/p&gt;
{ a: 1, b: 1 }
&lt;p&gt; when it should choose the covering index &lt;/p&gt;
{ a: 1, c: 1 }
&lt;p&gt;.&lt;/p&gt;

&lt;p&gt;This happens because the optimizer doesn&apos;t consider the projection when selecting a plan, so it chooses the first plan that seems optimal (which is a: 1, b: 1 because that index appears first in the list of indexes for the namespace).&lt;/p&gt;

&lt;p&gt;To reproduce:&lt;br/&gt;
db.a.ensureIndex(&lt;/p&gt;
{ a: 1, b: 1 }
&lt;p&gt;)&lt;br/&gt;
db.a.ensureIndex(&lt;/p&gt;
{ a: 1, c: 1 }
&lt;p&gt;)&lt;br/&gt;
db.a.insert(&lt;/p&gt;
{ a: 10, b: 10, c: 10 }
&lt;p&gt;)&lt;br/&gt;
db.a.find({ a: &lt;/p&gt;
{ $gte: 10, $lte: 12 }
&lt;p&gt; }, &lt;/p&gt;
{ a: 1, c: 1, _id: 0 }
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;The current work-around is to add a hint for the proper covering index. It would be neat if the correct index was chosen without a hint, though.&lt;/p&gt;</description>
                <environment></environment>
        <key id="89236">SERVER-10728</key>
            <summary>Query optimizer should consider the projection when selecting a plan</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="esmet">John Esmet</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Sep 2013 18:01:50 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:32 +0000</updated>
                            <resolved>Wed, 11 Sep 2013 02:58:28 +0000</resolved>
                                    <version>2.4.6</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="422372" author="dan@10gen.com" created="Wed, 11 Sep 2013 02:58:29 +0000"  >&lt;p&gt;Thanks for the clear report.  I think this is duplicated by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2109&quot; title=&quot;Query optimizer should pick plans that can use covered indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2109&quot;&gt;&lt;del&gt;SERVER-2109&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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