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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-2470] sort (using an index + $exists) incorrectly excluding results</title>
                <link>https://jira.mongodb.org/browse/SERVER-2470</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;our queries with sorts aren&apos;t returning results that really should be returned. I believe this happens when the index used by the sort doesn&apos;t include the record(s) that should be returned. here&apos;s a simple way to reproduce the problem:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.version()&lt;br/&gt;
1.6.5&lt;br/&gt;
&amp;gt; db.foo.insert(&lt;/p&gt;
{a: 1, b: 2}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foo.find({}).sort(&lt;/p&gt;
{c: -1}
&lt;p&gt;)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4d49a87bff97b37303687cfa&quot;), &quot;a&quot; : 1, &quot;b&quot; : 2 }
&lt;p&gt;  // all ok so far&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foo.find({c: {$exists: false}}).sort(&lt;/p&gt;
{c: -1}
&lt;p&gt;)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4d49a87bff97b37303687cfa&quot;), &quot;a&quot; : 1, &quot;b&quot; : 2 }
&lt;p&gt;  // still ok&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foo.ensureIndex(&lt;/p&gt;
{c: -1}
&lt;p&gt;)  // now we have an index on the sort key&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foo.find({c: {$exists: false}}).sort(&lt;/p&gt;
{c: -1}
&lt;p&gt;)  // which makes my result disappear&lt;/p&gt;

&lt;p&gt;&amp;gt; db.foo.find({}).sort(&lt;/p&gt;
{c: -1}
&lt;p&gt;)  // still ok without the $exists&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4d49a87bff97b37303687cfa&quot;), &quot;a&quot; : 1, &quot;b&quot; : 2 }

&lt;p&gt;&amp;gt; db.foo.find({c: {$not: {$exists: true}}}).sort(&lt;/p&gt;
{c: -1}
&lt;p&gt;)  // and ok with a convoluted $not $exists&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4d49a87bff97b37303687cfa&quot;), &quot;a&quot; : 1, &quot;b&quot; : 2 }


&lt;p&gt;this didn&apos;t happen in 10.6.3 (not sure in 10.6.4).&lt;/p&gt;</description>
                <environment>osx 10.6.6</environment>
        <key id="14423">SERVER-2470</key>
            <summary>sort (using an index + $exists) incorrectly excluding results</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="visnup">Visnu Pitiyanuvath</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Feb 2011 19:06:13 +0000</created>
                <updated>Thu, 17 Mar 2011 19:13:12 +0000</updated>
                            <resolved>Wed, 2 Feb 2011 20:00:06 +0000</resolved>
                                    <version>1.6.5</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="23016" author="visnup" created="Wed, 2 Feb 2011 23:23:02 +0000"  >&lt;p&gt;leaving closed and left a comment on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1587&quot; title=&quot;$exists:false not working correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1587&quot;&gt;&lt;del&gt;SERVER-1587&lt;/del&gt;&lt;/a&gt;. re-checked and also broken in 1.6.3.&lt;/p&gt;</comment>
                            <comment id="23011" author="aaron" created="Wed, 2 Feb 2011 20:00:06 +0000"  >&lt;p&gt;Probably the same as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1587&quot; title=&quot;$exists:false not working correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1587&quot;&gt;&lt;del&gt;SERVER-1587&lt;/del&gt;&lt;/a&gt;.  Please reopen if that&apos;s not the case.  (If you&apos;re sure it&apos;s not happening on 1.6.3 that would be unexpected since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1587&quot; title=&quot;$exists:false not working correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1587&quot;&gt;&lt;del&gt;SERVER-1587&lt;/del&gt;&lt;/a&gt; has been around for a while.)&lt;/p&gt;</comment>
                            <comment id="23009" author="visnup" created="Wed, 2 Feb 2011 19:08:16 +0000"  >&lt;p&gt;sorry, that should read &quot;this didn&apos;t happen in 1.6.3 (not sure in 1.6.4).&quot; I was clarifying mongodb versions, not osx versions.&lt;/p&gt;</comment>
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