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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-73300] [CQF] Stats generation over dotted path keys does not distinguish between leaf array and array along path</title>
                <link>https://jira.mongodb.org/browse/SERVER-73300</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For two documents such as&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;calculating the histogram stats over a key &apos;a.b&apos; will not be able to distinguish the two. The counts in the histogram more-or-less represent the first case, and we lose the information that &apos;a&apos; was an array of objects with &apos;b&apos; fields. The reason for this is that the stats-generating pipeline attempts to get the value of a particular key via a stage such as {$project: {val: &amp;lt;$path&amp;gt;}} before passing to a group stage, which will traverse arrays and objects but lose any context along that path.&lt;/p&gt;

&lt;p&gt;In practice, this shouldn&apos;t affect our cardinality estimation for &lt;em&gt;most&lt;/em&gt; queries, since typically the path &apos;a.b&apos; should consider both docs as equivalent for matching purposes. The issue comes with $elemMatch, since a query such as {a.b: {$elemMatch: {$eq: 1}}} should treat the leaf array as a match but not the array of documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2243159">SERVER-73300</key>
            <summary>[CQF] Stats generation over dotted path keys does not distinguish between leaf array and array along path</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>
                    </labels>
                <created>Wed, 25 Jan 2023 15:28:59 +0000</created>
                <updated>Thu, 2 Feb 2023 19:53:03 +0000</updated>
                                                                                                <votes>0</votes>
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