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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-72486] Expand the set of queries eligible for SBE in the 7.0 release</title>
                <link>https://jira.mongodb.org/browse/SERVER-72486</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is the same as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71798&quot; title=&quot;Expand the set of queries eligible for SBE in the 6.3 release&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71798&quot;&gt;&lt;del&gt;SERVER-71798&lt;/del&gt;&lt;/a&gt;, but for 7.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2223082">SERVER-72486</key>
            <summary>Expand the set of queries eligible for SBE in the 7.0 release</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.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                            <label>pm2697-70</label>
                            <label>pm2697-m3</label>
                    </labels>
                <created>Tue, 3 Jan 2023 19:00:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:28:43 +0000</updated>
                            <resolved>Thu, 30 Mar 2023 21:37:24 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5314012" author="xgen-internal-githook" created="Thu, 30 Mar 2023 21:19:28 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72486&quot; title=&quot;Expand the set of queries eligible for SBE in the 7.0 release&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72486&quot;&gt;&lt;del&gt;SERVER-72486&lt;/del&gt;&lt;/a&gt; Enable all features supported in SBE by default&lt;/p&gt;

&lt;p&gt;&apos;featureFlagSbeFull&apos; remains off by default but after this&lt;br/&gt;
change has no function. We plan to re-use it in upcoming&lt;br/&gt;
projects to flag-guard extensions to the SBE engine while&lt;br/&gt;
they are under development.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6afa8dd2bb3435e3632375a545d8a2c76a1cd620&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6afa8dd2bb3435e3632375a545d8a2c76a1cd620&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
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            <issuekey id="2302948">COMPASS-6684</issuekey>
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            <issuekey id="2200720">SERVER-71798</issuekey>
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                            <customfieldvalue>This change enables additional scenarios in the slot-based execution engine (SBE), the new query execution engine that the query execution team has been working on for the last few years. The SBE engine was enabled in a limited way in 6.0 but was first broadly enabled in 6.3 under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71798&quot; title=&quot;Expand the set of queries eligible for SBE in the 6.3 release&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71798&quot;&gt;&lt;strike&gt;SERVER-71798&lt;/strike&gt;&lt;/a&gt;.&lt;br/&gt;
&lt;br/&gt;
This change goes further and enables even more scenarios in SBE for the 7.0 LTS release. The change in execution engine should be largely transparent to applications and end-users. However, given the scope of the changes between Classic and SBE, performance differences are possible. (For the most part SBE in 7.0 is a faster engine when compared to the Classic Engine.)&lt;br/&gt;
&lt;br/&gt;
The fact that SBE is being used under the hood will show up in the server&amp;#39;s debug mechanisms, which is the main reason that I&amp;#39;ve marked this as needing downstream attention. In particular, the explain output will look substantially different for SBE. Explain output for queries using the classic engine report explainVersion:&amp;quot;1&amp;quot; whereas explain output for queries using SBE report explainVersion:&amp;quot;2&amp;quot;.&lt;br/&gt;
&lt;br/&gt;
There are also some differences in debug output produced by $planCacheStats as well as changes in system.profile and slow query log lines (e.g. an indication that SBE was the engine used).</customfieldvalue>

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