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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-22403] Clean up dynamic_cast&apos;s in pipeline directory</title>
                <link>https://jira.mongodb.org/browse/SERVER-22403</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We often use &lt;tt&gt;dynamic_cast&lt;/tt&gt; when we really want to check if something is an exact type. &lt;tt&gt;dynamic_cast&lt;/tt&gt; is unnecessarily expensive for this use, and we should use &lt;tt&gt;typeid&lt;/tt&gt; instead. &lt;/p&gt;

&lt;p&gt;For example, we could create a helper as follows:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;template&lt;/span&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; &amp;lt;TargetClass&amp;gt;&lt;/span&gt;&lt;/pre&gt;
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						&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;bool&lt;/span&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; exactDynamicCast(&lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&lt;/span&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;* srcObj) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;    &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&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; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;typeid&lt;/span&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;(TargetClass) == &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;typeid&lt;/span&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;(*srcObj);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="262209">SERVER-22403</key>
            <summary>Clean up dynamic_cast&apos;s in pipeline directory</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>optimization</label>
                            <label>storch</label>
                    </labels>
                <created>Mon, 1 Feb 2016 16:52:50 +0000</created>
                <updated>Tue, 6 Dec 2022 04:34:52 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1451181" author="james.wahlin@10gen.com" created="Wed, 7 Dec 2016 13:42:16 +0000"  >&lt;p&gt;The worst offenders in profiling dynamic_cast use for $lookup are:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;PipelineD::prepareCursorSource&lt;/li&gt;
	&lt;li&gt;Pipeline::ensureAllStagesAreInLegalPositions&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="1451175" author="charlie.swanson" created="Wed, 7 Dec 2016 13:25:29 +0000"  >&lt;p&gt;Moving back into Needs Triage based on &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt;&apos;s recent performance work in the linked &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27309&quot; title=&quot;Replace dynamic_cast calls where possible in pipeline/* code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27309&quot;&gt;&lt;del&gt;SERVER-27309&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1159844" author="schwerin" created="Mon, 1 Feb 2016 17:54:21 +0000"  >&lt;p&gt;You would be well advised to get out of type checking entirely. It would be better to add a property to the base class that you can interrogate, focused on the actual thing you care about. I suspect the exact type match stands in for some such property.&lt;/p&gt;</comment>
                            <comment id="1159793" author="adam.midvidy" created="Mon, 1 Feb 2016 17:14:47 +0000"  >&lt;p&gt;can you use checked_cast?&lt;/p&gt;</comment>
                    </comments>
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