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    <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-68281] Improve ValueGuard performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-68281</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The call to releaseValue() is not inlined, (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/exec/sbe/values/value.h#L286&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;link&lt;/a&gt;). Also, it&apos;s very common that we dismiss a ValueGuard before it&apos;s destroyed, which means the call to releaseValue() does nothing.&lt;/p&gt;

&lt;p&gt;We can improve this by avoiding the call to releaseValue() when the owned value is &lt;tt&gt;Nothing&lt;/tt&gt;. We could extend this for all shallow types, but it would require changing the layout of TypeTags.&lt;/p&gt;

&lt;p&gt;A test version of this change has shown a measurable improvement on some queries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2098763">SERVER-68281</key>
            <summary>Improve ValueGuard performance</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="parker.felix@mongodb.com">Parker Felix</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jul 2022 20:46:48 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:21 +0000</updated>
                            <resolved>Fri, 19 Aug 2022 20:12:56 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4741938" author="xgen-internal-githook" created="Wed, 10 Aug 2022 19:08:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Parker Felix&apos;, &apos;email&apos;: &apos;parker.felix@mongodb.com&apos;, &apos;username&apos;: &apos;parker-felix&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68281&quot; title=&quot;Improve ValueGuard performance&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68281&quot;&gt;&lt;del&gt;SERVER-68281&lt;/del&gt;&lt;/a&gt; Improve ValueGuard performance&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f2f1e82b260243c730d4d9d029a8c8268dc09a0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f2f1e82b260243c730d4d9d029a8c8268dc09a0&lt;/a&gt;&lt;/p&gt;</comment>
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