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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-62762] Introduce PlanCache interface</title>
                <link>https://jira.mongodb.org/browse/SERVER-62762</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of the SBE plan cache project, we now have two separate plan cache implementations: &lt;tt&gt;mongo::PlanCache&lt;/tt&gt; and &lt;tt&gt;mongo::sbe::PlanCache&lt;/tt&gt;. The former is the legacy implementation which stores index tags, and the latter is the SBE-specific cache which stores SBE plans. These two plan caches share much of their logic, and differ largely in the representation of the cached plan. At the moment, code sharing has been achieved with a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f7ee45c35d778188402f9b2fe972c96706922165/src/mongo/db/query/plan_cache.h#L243&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;PlanCacheBase&lt;/tt&gt; template class&lt;/a&gt;. This is convenient because the underlying data structure is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f7ee45c35d778188402f9b2fe972c96706922165/src/mongo/db/query/lru_key_value.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;LRUKeyValue&lt;/tt&gt;&lt;/a&gt; which is also templated on the key and value types.&lt;/p&gt;

&lt;p&gt;However, there are various places in the code where we would like to perform the same actions against both plan caches (e.g. when we need to flush cache contents due to the creation of an index filter). At the moment this cannot be easily abstracted across both plan caches without a template function. In order to avoid this kind of &quot;infectious&quot; templatization effect, it would be convenient to have a &lt;tt&gt;PlanCache&lt;/tt&gt; interface allowing runtime polymorphism. We should introduce a &lt;tt&gt;PlanCache&lt;/tt&gt; interface but still share code between the SBE and classic implementations using the templated base class.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1966916">SERVER-62762</key>
            <summary>Introduce PlanCache interface</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Jan 2022 19:37:38 +0000</created>
                <updated>Tue, 6 Dec 2022 00:38:38 +0000</updated>
                            <resolved>Thu, 31 Mar 2022 17:54:00 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4448338" author="anton.korshunov" created="Thu, 31 Mar 2022 17:54:01 +0000"  >&lt;p&gt;After discussing it at the team meeting we decided this work is not important enough for the plan cache project, so we&apos;re closing it as &quot;Won&apos;t do&quot;.&lt;/p&gt;</comment>
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