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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-66817] Re-enable featureFlagSbePlanCache</title>
                <link>https://jira.mongodb.org/browse/SERVER-66817</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The in-progress work from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mihai.andrei%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mihai.andrei@mongodb.com&quot;&gt;mihai.andrei@mongodb.com&lt;/a&gt; for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66583&quot; title=&quot;Re-enable SBE as the default engine, falling back to classic unless $lookup or $group are pushed down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66583&quot;&gt;&lt;del&gt;SERVER-66583&lt;/del&gt;&lt;/a&gt; will set the default value of &lt;tt&gt;featureFlagSbePlanCache&lt;/tt&gt; to false. This makes sense because in release configurations we intend to only support SBE with pushed down $group and $lookup &amp;#8211; but the SBE plan cache does not yet work with $group and $lookup queries.&lt;/p&gt;

&lt;p&gt;This ticket tracks the work to re-enable the SBE plan cache feature flag by default (in the master branch only) once we are prepared to do so.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2056253">SERVER-66817</key>
            <summary>Re-enable featureFlagSbePlanCache</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="13203">Gone away</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 May 2022 20:17:20 +0000</created>
                <updated>Fri, 27 Oct 2023 20:45:26 +0000</updated>
                            <resolved>Tue, 21 Jun 2022 17:43:05 +0000</resolved>
                                                                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4629913" author="david.storch" created="Tue, 21 Jun 2022 17:42:32 +0000"  >&lt;p&gt;The situation here has changed. In order to get good SBE performance on a whole bunch of workloads we need the SBE plan cache enabled. But we also need the &quot;applyClassicMatcher&quot; work from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66814&quot; title=&quot;Call into classic MatchExpression evaluation code from SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66814&quot;&gt;&lt;del&gt;SERVER-66814&lt;/del&gt;&lt;/a&gt; in order to get good SBE performance. This poses a problem, because the &quot;applyClassicMatcher&quot; behavior cannot work with the SBE plan cache, and is inhibited when &lt;tt&gt;featureFlagSbePlanCache&lt;/tt&gt; is enabled.&lt;/p&gt;

&lt;p&gt;The SBE performance project will have to untie this gordian knot by fixing SBE native matching performance and deleting &quot;applyClassicMatcher&quot;. In the process, the SBE performance project will also enable &lt;tt&gt;featureFlagSbeFull&lt;/tt&gt; by default. For this reason, it makes sense to delete &lt;tt&gt;featureFlagSbePlanCache&lt;/tt&gt; and consolidate it with &lt;tt&gt;featureFlagSbeFull&lt;/tt&gt;. That work is planned under related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61314&quot; title=&quot;Consolidate featureFlagSbePlanCache and featureFlagSbeFull&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61314&quot;&gt;&lt;del&gt;SERVER-61314&lt;/del&gt;&lt;/a&gt;. Resolving this ticket as &quot;Gone Away&quot;.&lt;/p&gt;</comment>
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            <issuekey id="2050662">SERVER-66583</issuekey>
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