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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-14406] Differences in null matching between 2.4 and 2.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-14406</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Finding null in an array field used to return documents with empty arrays and no longer does. &lt;a href=&quot;https://jira.mongodb.org/browse/NODE-208&quot; title=&quot;Discrepancy between 2.4 and 2.6 behaviour in find()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;NODE-208&quot;&gt;&lt;del&gt;NODE-208&lt;/del&gt;&lt;/a&gt; describes the problem in more detail (I wrongly&lt;br/&gt;
thought it was a driver or Mongoose issue).&lt;/p&gt;

</description>
                <environment></environment>
        <key id="144865">SERVER-14406</key>
            <summary>Differences in null matching between 2.4 and 2.6</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="markc">Mark Chapman</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Jul 2014 17:35:55 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:53 +0000</updated>
                            <resolved>Wed, 2 Jul 2014 14:58:45 +0000</resolved>
                                    <version>2.6.3</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="645861" author="ramon.fernandez" created="Wed, 2 Jul 2014 14:31:45 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=markc&quot; class=&quot;user-hover&quot; rel=&quot;markc&quot;&gt;markc&lt;/a&gt;, this behavior change was part of the rewrite of the query engine in 2.6, which included cleaning up areas were 2.4 was erroneous or inconsistent. In this particular case, &lt;tt&gt;null&lt;/tt&gt; now only matches &lt;tt&gt;null&lt;/tt&gt;, and not missing array fields. &lt;a href=&quot;http://docs.mongodb.org/manual/release-notes/2.6-compatibility/#null-comparison-queries&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This new behavior is documented here&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If you want to elaborate of what you&apos;d like your application to do we may be able to suggest an approach that works with 2.6. Remember that for MongoDB-related support discussion we recommend you post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-users group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;This script prints &lt;tt&gt;1&lt;/tt&gt; in 2.4, and &lt;tt&gt;0&lt;/tt&gt; in 2.6:&lt;/p&gt;
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