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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-81378] Change classic behavior: equality to null should not match undefined</title>
                <link>https://jira.mongodb.org/browse/SERVER-81378</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The undefined type has been deprecated for a long time. In v8.0, we will change classic and stage builders behavior so that comparison to null does not match undefined.&lt;/p&gt;

&lt;p&gt;This ticket will include the necessary updates to the classic comparison expressions, classic index bounds building, and stage builders code. We should consider doing a performance investigation to see if there are improvements for comparison to null queries, which should be simpler after this change. Also, we will likely need to make updates to the query fuzzers. We should consider if it&apos;s worthwhile to fuzz with data containing undefined values.&lt;/p&gt;

&lt;p&gt;In preparation for this, we will provide downstream notifications, including recommendations for ways to achieve the original behavior, when the work is complete.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2449339">SERVER-81378</key>
            <summary>Change classic behavior: equality to null should not match undefined</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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Sep 2023 17:38:55 +0000</created>
                <updated>Fri, 2 Feb 2024 23:21:58 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="6022147" author="hana.pearlman" created="Thu, 18 Jan 2024 14:06:10 +0000"  >&lt;p&gt;Had a conversation with some stakeholders about this ticket and people seemed lukewarm about the feature flag. It ended up seeming way easier to do the ticket without one, so I skipped it. Updated the ticket description and made a note about this in the PR. For anyone getting this notification, let me know if you feel strongly.&lt;/p&gt;</comment>
                            <comment id="5774733" author="david.storch" created="Thu, 12 Oct 2023 19:54:59 +0000"  >&lt;blockquote&gt;&lt;p&gt;including recommendations for ways to achieve the original behavior, when the work is complete&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;In addition, I think we should recommend a way to migrate undefined values in existing data sets to null values. Here&apos;s one example:&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;db.c.update({a: {$type: &quot;undefined&quot;}}, {$set: {a: null}}, {multi: true})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;This will work for updating all of the undefined values in top-level field &lt;tt&gt;a&lt;/tt&gt; to null for collection &lt;tt&gt;c&lt;/tt&gt;. Things would get more complicated if there are undefined values in dynamically named fields, undefined values nested inside arrays, or undefined values across many collections/databases. We do not yet intend to offer a complete solution which customers can use to automatically find all &lt;tt&gt;undefined&lt;/tt&gt; values and rewrite them as &lt;tt&gt;null&lt;/tt&gt;, but the kind of basic example above definitely needs to work in the case of customers with old datasets who wish to rid themselves of the undefined data type.&lt;/p&gt;</comment>
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