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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-64882] Eliminate fallback code which uses the classic cache when the SBE cache is disabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-64882</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2008360">SERVER-64882</key>
            <summary>Eliminate fallback code which uses the classic cache when the SBE cache is disabled</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                            <label>pm2697-m4</label>
                    </labels>
                <created>Thu, 24 Mar 2022 17:30:44 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:36 +0000</updated>
                            <resolved>Mon, 24 Apr 2023 14:38:50 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5370574" author="xgen-internal-githook" created="Mon, 24 Apr 2023 14:36:25 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@mongodb.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64882&quot; title=&quot;Eliminate fallback code which uses the classic cache when the SBE cache is disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64882&quot;&gt;&lt;del&gt;SERVER-64882&lt;/del&gt;&lt;/a&gt; Only generate DebugInfoSBE when plan is not from cache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41e18b1bf03ca7b22392663983fa345f9939e6bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41e18b1bf03ca7b22392663983fa345f9939e6bd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5360177" author="mihai.andrei" created="Wed, 19 Apr 2023 18:46:34 +0000"  >&lt;p&gt;Note that there&apos;s only one reference to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64882&quot; title=&quot;Eliminate fallback code which uses the classic cache when the SBE cache is disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64882&quot;&gt;&lt;del&gt;SERVER-64882&lt;/del&gt;&lt;/a&gt; in the codebase &lt;a href=&quot;https://github.com/mongodb/mongo/blob/989c66047e85017f865d84909cc1f480cc014bfe/src/mongo/db/query/plan_explainer_factory.cpp#L84-L90&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;at the time of writing&lt;/a&gt;. I am going to open a PR to remove it (the &quot;big&quot; reference to this ticket was &lt;a href=&quot;https://github.com/mongodb/mongo/commit/b185d04364c298e701943a1e800c4036ce8df6e7#diff-0154ea2007ca37ba4a4ce4854565b2870c871418090f5f965b18f68afbc05e1aL1183&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b185d04364c298e701943a1e800c4036ce8df6e7#diff-0154ea2007ca37ba4a4ce4854565b2870c871418090f5f965b18f68afbc05e1aL1183&lt;/a&gt;&#160; but it has been removed).&lt;/p&gt;

&lt;p&gt;Then, with respect to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1382877972003390495e3dfe261ef368e24be163/src/mongo/db/query/canonical_query_encoder.cpp#L702-L704&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1382877972003390495e3dfe261ef368e24be163/src/mongo/db/query/canonical_query_encoder.cpp#L702-L704&lt;/a&gt; : this code has been removed by... &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63346&quot; title=&quot;Stop including a flag about whether the plan cache entry is for SBE/classic in the classic plan cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63346&quot;&gt;&lt;del&gt;SERVER-63346&lt;/del&gt;&lt;/a&gt;.&#160;&lt;/p&gt;</comment>
                            <comment id="5176360" author="david.storch" created="Tue, 7 Feb 2023 22:20:49 +0000"  >&lt;p&gt;&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; as part of this ticket we should look into whether this line of code can be simplified:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/1382877972003390495e3dfe261ef368e24be163/src/mongo/db/query/canonical_query_encoder.cpp#L702-L704&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/1382877972003390495e3dfe261ef368e24be163/src/mongo/db/query/canonical_query_encoder.cpp#L702-L704&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This looks like it is only necessary to ensure that queries using SBE have a different &lt;em&gt;classic&lt;/em&gt; plan cache key encoding from the same query using the classic engine. Now that queries using SBE never use the classic plan cache, encoding the &quot;force classic engine&quot; byte into the classic plan cache key presumably isn&apos;t necessary anymore.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=anton.korshunov%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;anton.korshunov@mongodb.com&quot;&gt;anton.korshunov@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4488621" author="david.storch" created="Mon, 18 Apr 2022 17:16:10 +0000"  >&lt;p&gt;Please grep for &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64882&quot; title=&quot;Eliminate fallback code which uses the classic cache when the SBE cache is disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64882&quot;&gt;&lt;del&gt;SERVER-64882&lt;/del&gt;&lt;/a&gt;&quot; or &quot;TODO &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64882&quot; title=&quot;Eliminate fallback code which uses the classic cache when the SBE cache is disabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64882&quot;&gt;&lt;del&gt;SERVER-64882&lt;/del&gt;&lt;/a&gt;&quot; to find code that needs to be cleaned up before resolving this ticket.&lt;/p&gt;</comment>
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