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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>[DOCS-2341] Clarify $ifNull Behavior on Non-Existent Document Field</title>
                <link>https://jira.mongodb.org/browse/DOCS-2341</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/operator/aggregation/ifNull/#ifnull-aggregation&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/operator/aggregation/ifNull/#ifnull-aggregation&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Consider&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$ifNull:[&quot;$thisFieldDoesNotExist&quot;,true]}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;seems to consider the value of &lt;tt&gt;&quot;$thisFieldDoesNotExist&quot;&lt;/tt&gt; as being &lt;tt&gt;null&lt;/tt&gt;, so the expression evaluates to &lt;tt&gt;true&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Assuming this behavior is consistent across all Aggregation Framework-enabled versions, it&apos;d be good to explicitly state this or include an example that shows this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="101057">DOCS-2341</key>
            <summary>Clarify $ifNull Behavior on Non-Existent Document Field</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="-1">Unassigned</assignee>
                                    <reporter username="stephen.lee">Stephen Lee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Dec 2013 15:00:27 +0000</created>
                <updated>Wed, 11 Jan 2017 22:41:34 +0000</updated>
                            <resolved>Sat, 7 Dec 2013 04:51:16 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
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