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<item>
            <title>[SERVER-27309] Replace dynamic_cast calls where possible in pipeline/* code</title>
                <link>https://jira.mongodb.org/browse/SERVER-27309</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We use dynamic_cast in many places under db/pipeline to determine whether a pipeline stage is of a certain type and in some cases invoke methods on the DocumentSource subclass instance returned. Several locations show up as a hotspot under VTune when running the &quot;Aggregation.Lookup&quot; mongo-perf micro-benchmark. We should look to replace dynamic_cast usage with a more performant mechanism.&lt;/p&gt;</description>
                <environment></environment>
        <key id="336829">SERVER-27309</key>
            <summary>Replace dynamic_cast calls where possible in pipeline/* code</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Dec 2016 22:38:23 +0000</created>
                <updated>Tue, 6 Dec 2022 04:10:14 +0000</updated>
                            <resolved>Wed, 7 Dec 2016 13:24:32 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1451173" author="charlie.swanson" created="Wed, 7 Dec 2016 13:24:32 +0000"  >&lt;p&gt;&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;, this actually looks like a duplicate of one I filed a while ago: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22403&quot; title=&quot;Clean up dynamic_cast&amp;#39;s in pipeline directory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22403&quot;&gt;SERVER-22403&lt;/a&gt;. I&apos;ll bump that one back into &quot;Needs Triage&quot; since it showed up in the performance profiling.&lt;/p&gt;</comment>
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