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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-41383] $merge should resolve &apos;let&apos; variables only if they&apos;re referenced in the update pipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-41383</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if a $merge stage has the &apos;let&apos; variables defined, but they&apos;re not referenced in the update pipeline, we will still resolve those variables and will pass it down to the update system, even though they&apos;re not needed. We also have a default variable `$$new` which is resolved to the entire input document if the user omitted the `let` argument. To maximize performance and reduce the stress on update throughput, we should perform an introspection of the update pipeline when creating a $merge stage and remove all `let&apos; variables which are not used in the update pipeline.&lt;/p&gt;

&lt;p&gt;We can also prevent shipping out runtime constants (such as $$NOW and $$CLUSTER_TIME) with every update request if they&apos;re also not used in the update pipeline or `let` variables.&lt;/p&gt;</description>
                <environment></environment>
        <key id="782242">SERVER-41383</key>
            <summary>$merge should resolve &apos;let&apos; variables only if they&apos;re referenced in the update pipeline</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Thu, 30 May 2019 10:59:39 +0000</created>
                <updated>Thu, 19 Jan 2023 19:52:42 +0000</updated>
                                            <version>4.2.0</version>
                                                    <component>Aggregation Framework</component>
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