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    <title>MongoDB Jira</title>
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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-13903] inconsistent treatment of null in $project comparisons vs other stages</title>
                <link>https://jira.mongodb.org/browse/SERVER-13903</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a field is missing (undefined), in project stage it is impossible to determine that by comparing it to null.&lt;br/&gt;
&lt;p/&gt;
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&lt;p/&gt; &lt;b&gt;only&lt;/b&gt; returns true if &apos;field&apos; is present &lt;b&gt;and&lt;/b&gt; null.&lt;/p&gt;

&lt;p&gt;This is inconsistent with many other places, including ifNull treating null and undefined the same, as well as group (_id null and undefined all go into one bucket).&lt;/p&gt;

&lt;p&gt;If this is intentional then it should be documented.&lt;/p&gt;

&lt;p&gt;Tiny bit related to this is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6199&quot; title=&quot;$first and $last accumulators accept null, missing and undefined&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6199&quot;&gt;&lt;del&gt;SERVER-6199&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="135965">SERVER-13903</key>
            <summary>inconsistent treatment of null in $project comparisons vs other stages</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>eng-m</label>
                            <label>query-44-grooming</label>
                            <label>usability</label>
                    </labels>
                <created>Mon, 12 May 2014 06:30:01 +0000</created>
                <updated>Tue, 6 Dec 2022 05:06:12 +0000</updated>
                                            <version>2.6.1</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>2</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="3318198" author="asya" created="Mon, 3 Aug 2020 18:06:30 +0000"  >&lt;p&gt;$isNull expression would allow such a check.&lt;/p&gt;</comment>
                            <comment id="966317" author="asya" created="Wed, 15 Jul 2015 01:44:38 +0000"  >&lt;p&gt;This turns out to be problematic as there is no test for $nullish values.&lt;/p&gt;

&lt;p&gt;The only workaround to avoid errors is to use $ifNull to inject an explicit null so that comparison to null works.&lt;/p&gt;</comment>
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            <issuekey id="317381">SERVER-26180</issuekey>
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