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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-72261] Change CanChangeState::shouldCopyValue to only match bson values</title>
                <link>https://jira.mongodb.org/browse/SERVER-72261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Change CanChangeState::shouldCopyValue to only match bson values.&lt;/p&gt;

&lt;p&gt;SBE deals with 2 value sources:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;internal: all values created and managed by SBE. Those values are pointer stable, and don&apos;t require special handling during yielding save/restore.&lt;/li&gt;
	&lt;li&gt;external: values that are coming from outside of SBE (like bson returned by a storage cursors). Those values might not have stable pointers and in such case require special handling (copy) during yielding save/restore.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should limit CanChangeState::shouldCopyValue to only match the external values that have unstable pointers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2215391">SERVER-72261</key>
            <summary>Change CanChangeState::shouldCopyValue to only match bson values</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="anna.wawrzyniak@mongodb.com">Anna Wawrzyniak</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 19 Dec 2022 20:51:16 +0000</created>
                <updated>Tue, 7 Feb 2023 19:54:49 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5155542" author="JIRAUSER1263795" created="Tue, 31 Jan 2023 17:36:32 +0000"  >&lt;p&gt;I think the severity and impact of this issue is low, so probably P4 rather than P3. This is likely a good ticket for a new hire.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;A bit more elaboration on impact and kind of queries that might be affected:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;queries using Strings/Decimal128 manipulation (or any other sbe heap value other than Array/ArraySet/Object) might incur extra cost during save/restore, where we would make unnecessary copy of a String/Decimal.&lt;/li&gt;
	&lt;li&gt;query is likely going to have a small number of affected slots (like &amp;lt;10, rather than &amp;gt;100), so as long as those values are small it will not have noticeable perf impact.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5155148" author="JIRAUSER1257467" created="Tue, 31 Jan 2023 16:20:31 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anna.wawrzyniak%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;anna.wawrzyniak@mongodb.com&quot;&gt;anna.wawrzyniak@mongodb.com&lt;/a&gt; during Triage we would like to know your preference and priority to resolve this ticket.&#160;&lt;/p&gt;</comment>
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