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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-12877] $Not with non-existing fields change in 2.6 from 2.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-12877</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;//2.4&lt;br/&gt;
db.test.insert({_id:0})&lt;br/&gt;
db.test.find({a:{$not: {$lt: null}}})&lt;br/&gt;
//nothing returned&lt;/p&gt;

&lt;p&gt;//2.6&lt;br/&gt;
db.test.insert({_id:0})&lt;br/&gt;
db.test.find({a:{$not: {$lt: null}}})&lt;br/&gt;
{_id: 0}&lt;/p&gt;


&lt;p&gt;Note that this works with $lt:1 or any other value, not just null&lt;/p&gt;</description>
                <environment></environment>
        <key id="114240">SERVER-12877</key>
            <summary>$Not with non-existing fields change in 2.6 from 2.4</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="9">Done</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="andrew.emil@10gen.com">Andrew Emil</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Tue, 25 Feb 2014 02:55:20 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:43 +0000</updated>
                            <resolved>Thu, 17 Jul 2014 21:54:58 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="662462" author="david.storch" created="Thu, 17 Jul 2014 21:54:20 +0000"  >&lt;p&gt;This is a bug in 2.4 that has been fixed for 2.6.&lt;/p&gt;

&lt;p&gt;find({a: {$not: {$lt: &amp;lt;value&amp;gt;}}}) does not mean the same thing as find({a: {$gte: &amp;lt;value&amp;gt;}}). If &amp;lt;value&amp;gt; is a number, for example, then the former will match numbers greater than or equal to &amp;lt;value&amp;gt; as well as non-numbers. The latter will only match numbers greater than or equal to &amp;lt;value&amp;gt;.&lt;/p&gt;

&lt;p&gt;You should think of $not as complementing your result set. So since the document in the example above does not match the query db.test.find({a: {$lt: null}}) it should match db.test.find({a:{$not: {$lt: null}}}).&lt;/p&gt;</comment>
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