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    <title>MongoDB Jira</title>
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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-76041] Avoid SBE registering slots that aren&apos;t needed</title>
                <link>https://jira.mongodb.org/browse/SERVER-76041</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://github.com/10gen/mongo/blob/master/src/mongo/db/query/sbe_stage_builder.cpp#L128-L139&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/sbe_stage_builder.cpp#L128-L139&lt;/a&gt;&#160; we end up registering slots for&lt;/p&gt;

&lt;p&gt;$$USER_ROLES&lt;/p&gt;

&lt;p&gt;$$NOW&lt;/p&gt;

&lt;p&gt;$$SEARCH_META&lt;/p&gt;

&lt;p&gt;regardless of whether the query uses these variables or not. These slots aren&apos;t free, so if we could skip some/all when they aren&apos;t used, we&apos;d win some perf back.&lt;/p&gt;

&lt;p&gt;Likewise setUserRoles() is called whether we use $$USER_ROLES or not, and that also is not free, and would be great to only run if needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2313415">SERVER-76041</key>
            <summary>Avoid SBE registering slots that aren&apos;t needed</summary>
                <type id="5" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14716&amp;avatarType=issuetype">Sub-task</type>
                            <parent id="2092665">SERVER-68110</parent>
                                    <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="colin.stolley@mongodb.com">Colin Stolley</assignee>
                                    <reporter username="colin.stolley@mongodb.com">Colin Stolley</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Apr 2023 22:36:36 +0000</created>
                <updated>Wed, 10 May 2023 16:35:29 +0000</updated>
                            <resolved>Thu, 20 Apr 2023 17:08:57 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5363211" author="JIRAUSER1270902" created="Thu, 20 Apr 2023 17:08:33 +0000"  >&lt;p&gt;Closing as we can&apos;t know whether SEARCH_META will be set later on, so it&apos;s impossible to check for at SBE stage creation. Likewise, $$NOW appears to be used in contexts beyond what users might reference in their query, so that too must be kept. That only leaves $$USER_ROLES, which &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=militsa.sotirova%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;militsa.sotirova@mongodb.com&quot;&gt;militsa.sotirova@mongodb.com&lt;/a&gt; has addressed already in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76126&quot; title=&quot;Do not set value of $$USER_ROLES unless it is used in query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76126&quot;&gt;&lt;del&gt;SERVER-76126&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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