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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-67506] [CQF] Dotted path equality to null incorrectly matches non-object array elements</title>
                <link>https://jira.mongodb.org/browse/SERVER-67506</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The following query incorrectly returns the one document when run through CQF:&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(0, coll.find({&apos;a.b&apos;: null}).itcount());&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The semantics are that if the leading path resolves to an object, then the `b` field of that object must be null/missing. But in this case, the leading path `a` does not find an object even with implicit array traversal so the command should return 0 documents.&lt;/p&gt;

&lt;p&gt;The existing test that exercises this is &lt;a href=&quot;https://github.com/10gen/mongo/blob/d37641e0439f48745a656272a09eb121636ae7a2/jstests/core/arrayfind5.js#L9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2076079">SERVER-67506</key>
            <summary>[CQF] Dotted path equality to null incorrectly matches non-object array elements</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>Fri, 24 Jun 2022 14:03:11 +0000</created>
                <updated>Tue, 12 Sep 2023 19:21:52 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5697166" author="hana.pearlman" created="Tue, 12 Sep 2023 12:33:53 +0000"  >&lt;p&gt;After a discussion yesterday, we decided to defer changing behavior here. We think there is room for improvement in both the classic and CQF behavior, but are not prepared to commit to a change now. For now, we will fall back to classic on dotted path equality to null queries but otherwise leave the CQF behavior unchanged. &lt;/p&gt;

&lt;p&gt;I&apos;m moving this ticket out of the correctness project and leaving it open so we can pick the discussion back up when we&apos;re ready. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80976&quot; title=&quot;[CQF] Fall back to classic on dotted path comparison to null&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80976&quot;&gt;&lt;del&gt;SERVER-80976&lt;/del&gt;&lt;/a&gt; will handle changing the fallback mechanism for these queries.&lt;/p&gt;</comment>
                            <comment id="4675431" author="svilen.mihaylov" created="Wed, 13 Jul 2022 01:05:48 +0000"  >&lt;p&gt;Possibly related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36635?&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-36635?&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="2050924">SERVER-66606</issuekey>
        </issuelink>
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                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="2139338">SERVER-69782</issuekey>
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            <issuelink>
            <issuekey id="2169397">SERVER-70929</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="588742">SERVER-36681</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2139338">SERVER-69782</issuekey>
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            <issuelink>
            <issuekey id="2439531">SERVER-80976</issuekey>
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            <issuelink>
            <issuekey id="2292897">SERVER-75067</issuekey>
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