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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-78003] Avoid dynamic_cast in $not serialization</title>
                <link>https://jira.mongodb.org/browse/SERVER-78003</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When looking at the performance profile for our new $queryStats workload, I noticed a lot of time spent in __dynamic_cast when computing the shape of {&lt;tt&gt;$exists: false&lt;/tt&gt;} queries which translate into {&lt;tt&gt;$not: {$exists: true&lt;/tt&gt;}}. It was &lt;a href=&quot;https://github.com/10gen/mongo/blob/78fd67b9a4b4e13bb03d5c8ed5240f75ca493d58/src/mongo/db/matcher/expression_tree.cpp#L493&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt;, which doesn&apos;t seem to need to use dynamic_cast and can use `matchType()` to figure it out instead.&lt;/p&gt;

&lt;p&gt;I didn&apos;t see any other obvious usages of dynamic_cast in src/mongo/db/matcher&apos;s serialization functions. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2365612">SERVER-78003</key>
            <summary>Avoid dynamic_cast in $not serialization</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="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="13201">Fixed</resolution>
                                        <assignee username="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jun 2023 18:04:02 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:10 +0000</updated>
                            <resolved>Mon, 26 Jun 2023 17:09:07 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5525395" author="xgen-internal-githook" created="Mon, 26 Jun 2023 17:00:42 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;, &apos;username&apos;: &apos;cswanson310&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-78003&quot; title=&quot;Avoid dynamic_cast in $not serialization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-78003&quot;&gt;&lt;del&gt;SERVER-78003&lt;/del&gt;&lt;/a&gt; Avoid dynamic_cast in $not serialization&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1cddd4409d51b14c0cdb84717e8520fbaedf88b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1cddd4409d51b14c0cdb84717e8520fbaedf88b5&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2386387">SERVER-85055</issuekey>
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                            <attachment id="455592" name="baseline.svg" size="982928" author="charlie.swanson@mongodb.com" created="Mon, 12 Jun 2023 18:12:40 +0000"/>
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