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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-80359] [CQF] Make isLastRef more precise</title>
                <link>https://jira.mongodb.org/browse/SERVER-80359</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The default merge() behavior in reference_tracker.cpp misses some opportunities to mark a Variable as safe to move() from.&lt;/p&gt;

&lt;p&gt;When we get CollectedInfo from two subexpressions, we need to know the evaluation order to decide which side is evaluated last.  The default merge() can&apos;t decide this, because for example BinaryOp and FunctionCall could be different.  So we clear the last-reference flags from both sides: &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/reference_tracker.cpp#L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/optimizer/reference_tracker.cpp#L135&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;To decide the evaluation order of an ABT expression, you have to know:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;How it&apos;s lowered to an SBE EExpression&lt;/li&gt;
	&lt;li&gt;The evaluation order for that EExpression&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I&apos;m not sure if the evaluation order of an EExpression is well defined.  I think this is supposed to be an implementation detail of the VM: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68222&quot; title=&quot;Make arguments evaluation order consistent between built-in and instruction functions in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68222&quot;&gt;&lt;del&gt;SERVER-68222&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2424885">SERVER-80359</key>
            <summary>[CQF] Make isLastRef more precise</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Aug 2023 21:24:00 +0000</created>
                <updated>Mon, 28 Aug 2023 22:24:52 +0000</updated>
                            <resolved>Mon, 28 Aug 2023 22:24:52 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
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