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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-59332] Convert PlanCache to a template class</title>
                <link>https://jira.mongodb.org/browse/SERVER-59332</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We plan to make the current &lt;tt&gt;PlanCache&lt;/tt&gt; more generic so that it can be used to implement both the existing plan cache for the classic engine, as well as the SBE plan cache. We will have a &lt;tt&gt;PlanCacheBase&amp;lt;KeyType, CachedPlanType&amp;gt;&lt;/tt&gt; base class which has template parameters for the type of the plan cache key as well as the type of cached plan. The SBE/classic plan classes will each instantiate this template class.&lt;/p&gt;

&lt;p&gt;As a first step, we need to do a bit of surgery to the current &lt;tt&gt;PlanCache&lt;/tt&gt; in order to turn it into a template class. We should try to do this as mechanically as possible to keep this first patch relatively simple. A few notes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;There will be a lot of code motion here. We need to move most of the code in plan_cache.cpp into the header file in order to templatize the necessary types.&lt;/li&gt;
	&lt;li&gt;Right now you can&apos;t use logv2 from a header file. We&apos;ll have to deal with this. We handled this elsewhere by making the templated code call simple helper functions to do the logging. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/35255bcaea7bdc0cb7e1a100d7080d00c394f0b0/src/mongo/db/exec/plan_cache_util.cpp#L40-L71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Example here&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;You&apos;ll need to turn not only &lt;tt&gt;PlanCache&lt;/tt&gt; but also &lt;tt&gt;CachedSolution&lt;/tt&gt; and &lt;tt&gt;PlanCacheEntry&lt;/tt&gt; into template classes.&lt;/li&gt;
	&lt;li&gt;This patch won&apos;t actually interact at all with the SBE plan cache just yet. We will have template instantiations only for the classic engine. This is just prep work.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1850722">SERVER-59332</key>
            <summary>Convert PlanCache to a template class</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="joshua.lapacik@mongodb.com">Joshua Lapacik</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 12 Aug 2021 23:00:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:34 +0000</updated>
                            <resolved>Fri, 27 Aug 2021 20:35:28 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4106821" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:09:50 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4026717" author="david.storch" created="Fri, 27 Aug 2021 16:01:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=acm&quot; class=&quot;user-hover&quot; rel=&quot;acm&quot;&gt;acm&lt;/a&gt;, I don&apos;t think there is a fundamental reason that we are not implementing this with runtime polymorphism, but in my experiments with the code the template-based approach seemed easier to implement. If I recall correctly, this had to do with the fact that the underlying data structure which backs the plan cache is already a the template class &lt;tt&gt;LRUKeyValue&amp;lt;K, V&amp;gt;&lt;/tt&gt;.&lt;/p&gt;</comment>
                            <comment id="4022469" author="xgen-internal-githook" created="Wed, 25 Aug 2021 18:19:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;80741223+jlap199@users.noreply.github.com&apos;, &apos;email&apos;: &apos;80741223+jlap199@users.noreply.github.com&apos;, &apos;username&apos;: &apos;jlap199&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59332&quot; title=&quot;Convert PlanCache to a template class&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59332&quot;&gt;&lt;del&gt;SERVER-59332&lt;/del&gt;&lt;/a&gt; Convert PlanCache to a template class&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3820bd5558ccc46958cba972676501c1e9b56330&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3820bd5558ccc46958cba972676501c1e9b56330&lt;/a&gt;&lt;/p&gt;</comment>
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