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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-67550] [CQF] Equality to null does not match undefined</title>
                <link>https://jira.mongodb.org/browse/SERVER-67550</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is specific to bonsai, the classic optimizer does not have this issue. Equality to null correctly matches null and missing, however it misses values which are explicitly undefined. Simplest repro:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;assert.eq(db.test.find({a: null}).toArray(), [{_id: &quot;a_undefined&quot;, a: undefined}]);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="2077612">SERVER-67550</key>
            <summary>[CQF] Equality to null does not match undefined</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>bonsai-semantic-difference</label>
                    </labels>
                <created>Mon, 27 Jun 2022 17:52:20 +0000</created>
                <updated>Fri, 22 Sep 2023 17:41:19 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5725061" author="hana.pearlman" created="Fri, 22 Sep 2023 17:41:19 +0000"  >&lt;p&gt;As part of the most recent semantic differences conversation, we decided to try to change classic behavior to match Bonsai for v8.0. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81378&quot; title=&quot;Change classic behavior: equality to null should not match undefined&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81378&quot;&gt;SERVER-81378&lt;/a&gt; will change the classic behavior so that comparisons to null do not match undefined. I&apos;m going to leave this ticket open for now, since there are some TODOs associated with it. But, after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81378&quot; title=&quot;Change classic behavior: equality to null should not match undefined&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81378&quot;&gt;SERVER-81378&lt;/a&gt; is complete, we should be able to close this as works-as-designed.&lt;/p&gt;</comment>
                            <comment id="4706240" author="nicholas.zolnierz" created="Tue, 26 Jul 2022 17:32:42 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ruslan.abdulkhalikov%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;ruslan.abdulkhalikov@mongodb.com&quot;&gt;ruslan.abdulkhalikov@mongodb.com&lt;/a&gt; let&apos;s keep it open but park it on the backlog, these tickets will be useful to track diverging semantics.&lt;/p&gt;</comment>
                            <comment id="4706230" author="JIRAUSER1258885" created="Tue, 26 Jul 2022 17:28:52 +0000"  >&lt;p&gt;As discussed with ABT team we are going to park this ticket till the &quot;undefined&quot; semantics is well established&lt;/p&gt;</comment>
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