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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-59708] Make plan_explainer plan cache functionality generic</title>
                <link>https://jira.mongodb.org/browse/SERVER-59708</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;`plan_explainer.h` is a generic interface that shouldn&apos;t depend on either of the classic or SBE flavor of plan cache. At the moment it depends on the classic plan cache due to the method `&lt;tt&gt;getCachedPlanStats()&lt;/tt&gt;`.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1865368">SERVER-59708</key>
            <summary>Make plan_explainer plan cache functionality generic</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="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="peter.volk@mongodb.com">Peter Volk</assignee>
                                    <reporter username="joshua.lapacik@mongodb.com">Joshua Lapacik</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 1 Sep 2021 15:07:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:01 +0000</updated>
                            <resolved>Wed, 3 May 2023 13:41:48 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5399845" author="xgen-internal-githook" created="Thu, 4 May 2023 07:59:11 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Peter Volk&apos;, &apos;email&apos;: &apos;peter.volk@mongodb.com&apos;, &apos;username&apos;: &apos;HCSPete&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59708&quot; title=&quot;Make plan_explainer plan cache functionality generic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59708&quot;&gt;&lt;del&gt;SERVER-59708&lt;/del&gt;&lt;/a&gt; Make plan_explainer plan cache functionality generic&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f9a346c19b65d8e110080bd8109cdf7be103cc1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f9a346c19b65d8e110080bd8109cdf7be103cc1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4658479" author="david.storch" created="Tue, 5 Jul 2022 19:01:04 +0000"  >&lt;p&gt;The &lt;tt&gt;getCachedPlanStats()&lt;/tt&gt; method is only called by the code used for serializing plan cache entries to BSON to support the &lt;tt&gt;$planCacheStats&lt;/tt&gt; aggregation stage. It looks like the only callers are &lt;a href=&quot;https://github.com/mongodb/mongo/blob/02dfedb849374159219251422ada6035333e2c3b/src/mongo/db/query/explain.cpp#L445-L448&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. At the moment, it is still possible for us to use the classic cache for plans recovered from the cache that execute in SBE. This is currently possible when &lt;tt&gt;featureFlagSbePlanCache&lt;/tt&gt; is disabled, but after &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; we will only use the classic cache together with SBE when &lt;tt&gt;featureFlagSbeFull&lt;/tt&gt; is disabled.&lt;/p&gt;

&lt;p&gt;Once the classic cache is only used with the classic engine (never with SBE) then &lt;tt&gt;getCachedPlanStats&lt;/tt&gt; can become a non-virtual function and we can delete the implementation from &lt;tt&gt;PlanExecutorSBE&lt;/tt&gt;. I&apos;m moving this ticket to the backlog and marking it &quot;neweng&quot;, since it should be a pretty simple task once &lt;tt&gt;featureFlagSbeFull&lt;/tt&gt; is a thing of the past.&lt;/p&gt;</comment>
                            <comment id="4455232" author="anton.korshunov" created="Mon, 4 Apr 2022 16:19:36 +0000"  >&lt;p&gt;We can do this refactor only once we add support for $group and $lookup queries in SBE plan cache when we stop caching plans in the classic cache for SBE queries.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="1999354">SERVER-64432</issuekey>
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            <issuekey id="1925944">SERVER-61507</issuekey>
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