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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-80483] [CQF] Split last-ref analysis into a separate pass</title>
                <link>https://jira.mongodb.org/browse/SERVER-80483</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Every time we run the reference tracker, it gathers a set of last-refs (Variable expressions safe to move from), but we only use this information in lowering.  We should split this into a separate pass so we skip that work during all the other phases.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2428514">SERVER-80483</key>
            <summary>[CQF] Split last-ref analysis into a separate pass</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 22:31:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:59 +0000</updated>
                            <resolved>Fri, 15 Sep 2023 19:06:04 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5706135" author="xgen-internal-githook" created="Fri, 15 Sep 2023 01:43:34 +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-80483&quot; title=&quot;[CQF] Split last-ref analysis into a separate pass&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80483&quot;&gt;&lt;del&gt;SERVER-80483&lt;/del&gt;&lt;/a&gt; Only compute lastRefs where needed for lowering&lt;/p&gt;

&lt;p&gt;Most phases in the optimizer use VariableEnvironment only to connect&lt;br/&gt;
definitions and uses. The last-ref analysis is only needed when lowering&lt;br/&gt;
to SBE.&lt;/p&gt;

&lt;p&gt;This commit:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;changes the implementation of VariableEnvironment to compute&lt;br/&gt;
  lastRefs in a separate pass.&lt;/li&gt;
	&lt;li&gt;lets the caller choose to skip this separate pass.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It also makes the intermediate data structure in last-refs more&lt;br/&gt;
efficient, by not representing non-last-ref variables. Previously we&lt;br/&gt;
were iterating over these uninteresting variables at every level of the&lt;br/&gt;
recursion.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/96464e8d57559625b52138ee6f3967300db6425f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/96464e8d57559625b52138ee6f3967300db6425f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2438901">SERVER-80953</issuekey>
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                                        <issuelink>
            <issuekey id="2375044">SERVER-78353</issuekey>
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