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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-3175] Compound index on objects embedded in array can lead to inconsistent query results</title>
                <link>https://jira.mongodb.org/browse/SERVER-3175</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Creating a compound index on fields of objects embedded in an array can change the behavior of queries on those fields.  It&apos;s easiest to demonstrate this behavior using an example.  In the test case below, see that querying using the index produces no results, while the same query using no index produces one result.&lt;/p&gt;

&lt;p&gt;Test case:&lt;br/&gt;
&amp;gt; db.test.insert({ &quot;_id&quot; : 1, &quot;arr&quot; : [ &lt;/p&gt;
{ &quot;animal&quot; : &quot;cat&quot;, &quot;size&quot; : &quot;small&quot; }
&lt;p&gt;, &lt;/p&gt;
{ &quot;animal&quot; : &quot;dog&quot;, &quot;size&quot; : &quot;medium&quot; }
&lt;p&gt; ]});;&lt;br/&gt;
&amp;gt; db.test.ensureIndex(&lt;/p&gt;
{ &quot;arr.animal&quot; : 1, &quot;arr.size&quot; : 1 }
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.test.find(&lt;/p&gt;
{ &quot;arr.animal&quot; : &quot;cat&quot;, &quot;arr.size&quot; : &quot;medium&quot; }
&lt;p&gt;);&lt;br/&gt;
&amp;gt; db.test.find(&lt;/p&gt;
{ &quot;arr.animal&quot; : &quot;cat&quot;, &quot;arr.size&quot; : &quot;medium&quot; }
&lt;p&gt;).hint(&lt;/p&gt;
{ &quot;$natural&quot; : 1 }
&lt;p&gt;);&lt;br/&gt;
{ &quot;_id&quot; : 1, &quot;arr&quot; : [&lt;br/&gt;
        &lt;/p&gt;
{
                &quot;animal&quot; : &quot;cat&quot;,
                &quot;size&quot; : &quot;small&quot;
        }
&lt;p&gt;,&lt;/p&gt;
        {
                &quot;animal&quot; : &quot;dog&quot;,
                &quot;size&quot; : &quot;medium&quot;
        }
&lt;p&gt;] }&lt;/p&gt;</description>
                <environment></environment>
        <key id="17731">SERVER-3175</key>
            <summary>Compound index on objects embedded in array can lead to inconsistent query results</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="bross@playdom.com">Bryon Ross</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Jun 2011 01:16:00 +0000</created>
                <updated>Tue, 12 Jul 2016 00:20:41 +0000</updated>
                            <resolved>Tue, 25 Oct 2011 00:20:46 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="62381" author="bross@playdom.com" created="Mon, 24 Oct 2011 22:58:13 +0000"  >&lt;p&gt;It appears that this issue has been fixed in 2.0.&lt;/p&gt;</comment>
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