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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-32764] Compound index with multi key doesn&apos;t find best solution</title>
                <link>https://jira.mongodb.org/browse/SERVER-32764</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If I have an index of &lt;/p&gt;
{a:1,b:1,c:1}
&lt;p&gt; and query a=AA, b=BB, N1&amp;lt;c&amp;lt;N2, the index bounds to exactly that: a is bounded by AA, b is bounded by BB, and c is bounded by N1 and N2.&lt;/p&gt;

&lt;p&gt;BUT if instead the index is &lt;/p&gt;
{a:1, b.x:1, c:1}
&lt;p&gt; and query is a=AA, b.x=BB, N1&amp;lt;c&amp;lt;N2, the index only bounds a by AA, b.x by BB, and C by N1... requiring scanning to hit N2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="484431">SERVER-32764</key>
            <summary>Compound index with multi key doesn&apos;t find best solution</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="4">Incomplete</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="hbell@bluecanyontech.com">Hayle Bell</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jan 2018 14:50:54 +0000</created>
                <updated>Wed, 21 Mar 2018 04:32:54 +0000</updated>
                            <resolved>Fri, 16 Feb 2018 22:34:06 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1808611" author="thomas.schubert" created="Fri, 16 Feb 2018 22:34:06 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=hbell%40bluecanyontech.com&quot; class=&quot;user-hover&quot; rel=&quot;hbell@bluecanyontech.com&quot;&gt;hbell@bluecanyontech.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1779541" author="thomas.schubert" created="Fri, 19 Jan 2018 20:53:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=hbell%40bluecanyontech.com&quot; class=&quot;user-hover&quot; rel=&quot;hbell@bluecanyontech.com&quot;&gt;hbell@bluecanyontech.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this behavior. So we can continue investigate, would you please provide some additional information?&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Which version of MongoDB are you running?&lt;/li&gt;
	&lt;li&gt;Would you please provide the &lt;tt&gt;.explain()&lt;/tt&gt; output of the query with the inefficient index bounds?&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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