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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42046] Remove redundant moves from matcher code</title>
                <link>https://jira.mongodb.org/browse/SERVER-42046</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With gcc 9.1, there are a whole bunch of redundant move warnings/errors in the matcher (see an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2bc1da6a3d84551d7ae035320706621fabe341ae/src/mongo/db/matcher/expression_leaf.h#L266&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;example here&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2bc1da6a3d84551d7ae035320706621fabe341ae/src/mongo/db/matcher/expression_tree.h#L201&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="832714">SERVER-42046</key>
            <summary>Remove redundant moves from matcher 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="13201">Fixed</resolution>
                                        <assignee username="nikita.lapkov@mongodb.com">Nikita Lapkov</assignee>
                                    <reporter username="jonathan.reams@mongodb.com">Jonathan Reams</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>qexec-team</label>
                    </labels>
                <created>Tue, 2 Jul 2019 17:21:31 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:21 +0000</updated>
                            <resolved>Fri, 14 Aug 2020 12:33:14 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3339178" author="xgen-internal-githook" created="Fri, 14 Aug 2020 12:22:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nikita Lapkov&apos;, &apos;email&apos;: &apos;nikita.lapkov@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42046&quot; title=&quot;Remove redundant moves from matcher code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42046&quot;&gt;&lt;del&gt;SERVER-42046&lt;/del&gt;&lt;/a&gt;: Remove redundant moves from query code&lt;/p&gt;

&lt;p&gt;Since C++17 return value optimization is mandatory and no longer considered as copy elision (&lt;a href=&quot;https://en.cppreference.com/w/cpp/language/copy_elision&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://en.cppreference.com/w/cpp/language/copy_elision&lt;/a&gt;). This means that in some cases `return std::move(value)` can be replaced with just `return value`. We refactor Query code to remove these redundant moves. GCC 9.0.1 was used to detect such places in codebase&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34b1c989ed6e8a3f4f6056efc81367794cfe5398&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34b1c989ed6e8a3f4f6056efc81367794cfe5398&lt;/a&gt;&lt;/p&gt;</comment>
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