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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-62354] Improve reference tracker to support incremental updates</title>
                <link>https://jira.mongodb.org/browse/SERVER-62354</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When an ABT is modified during optimization, we currently recompute the dependencies for the entire tree, even for a simple modification. See this example during const eval, where we &lt;a href=&quot;https://github.com/10gen/mongo/blob/c9613f4ee7a6da5a93f2526df5f50ebcd025a365/src/mongo/db/query/optimizer/rewrites/const_eval.cpp#L114-L128&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;inline a variable&lt;/a&gt; and then we &lt;a href=&quot;https://github.com/10gen/mongo/blob/c9613f4ee7a6da5a93f2526df5f50ebcd025a365/src/mongo/db/query/optimizer/rewrites/const_eval.cpp#L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;rebuild the variable environment &lt;/a&gt; from scratch.&lt;/p&gt;

&lt;p&gt;We should add the ability to incrementally update the ABT dependencies after a specific change, rather than recomputing the dependencies from scratch. This would make sure the variable environment doesn&apos;t go out of sync with the ABT, so we don&apos;t have to constantly &lt;a href=&quot;https://github.com/10gen/mongo/blob/c9613f4ee7a6da5a93f2526df5f50ebcd025a365/src/mongo/db/query/optimizer/rewrites/const_eval.cpp#L106-L112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;account for it&lt;/a&gt; in our optimizations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1958469">SERVER-62354</key>
            <summary>Improve reference tracker to support incremental updates</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Jan 2022 21:03:29 +0000</created>
                <updated>Tue, 6 Dec 2022 00:41:50 +0000</updated>
                            <resolved>Tue, 4 Oct 2022 15:11:54 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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