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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-80480] [CQF] Avoid implicit copy from PolyValue::reference_type</title>
                <link>https://jira.mongodb.org/browse/SERVER-80480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PolyValue::reference_type has an implicit conversion to PolyValue, which has to deep copy.  This interacts with visit() and transport(), and is causing some unintentional deep copying, for example in several of the CE transports.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2428441">SERVER-80480</key>
            <summary>[CQF] Avoid implicit copy from PolyValue::reference_type</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="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Aug 2023 20:58:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:59 +0000</updated>
                            <resolved>Fri, 15 Sep 2023 19:05:48 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5706133" author="xgen-internal-githook" created="Fri, 15 Sep 2023 01:43:31 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80480&quot; title=&quot;[CQF] Avoid implicit copy from PolyValue::reference_type&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80480&quot;&gt;&lt;del&gt;SERVER-80480&lt;/del&gt;&lt;/a&gt; Avoid implicit copy of PolyValue from reference_type&lt;/p&gt;

&lt;p&gt;Previously we had an implicit constructor, &apos;PolyValue(const Reference&amp;amp;)&apos;.&lt;br/&gt;
This resulted in some hard to spot deep copies, and counterintuitive&lt;br/&gt;
behavior where adding &apos;.ref()&apos; would force copying where omitting&lt;br/&gt;
&apos;.ref()&apos; would not have needed to copy.&lt;/p&gt;

&lt;p&gt;This commit reverses that default: the expensive deep-copying&lt;br/&gt;
constructor is explicit, and the cheap &apos;Reference(const PolyValue&amp;amp;)&apos;&lt;br/&gt;
constructor is implicit. Passing a value where only a view is required&lt;br/&gt;
is cheap and implicit; creating a new value given only a view is&lt;br/&gt;
expensive, and explicit.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2e2149c8bcc6cf4a4892ac5be6c150949808ae18&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2e2149c8bcc6cf4a4892ac5be6c150949808ae18&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5680887" author="david.percy" created="Tue, 5 Sep 2023 19:02:24 +0000"  >&lt;p&gt;Edited this ticket to be just about the implicit copies, not the const behavior.&lt;/p&gt;</comment>
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