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    <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-64315] Re-enable caching of single solution plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-64315</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The classic plan cache did not create a cache entry for queries that only have a single solution. (Improving this is tracked by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13341&quot; title=&quot;Cache single solution query plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13341&quot;&gt;SERVER-13341&lt;/a&gt;.) The SBE plan cache, on the other hand, will cache single solution plans. This allows us to skip the cost of recompiling the SBE plan, even if there is no need to skip multi-planning.&lt;/p&gt;

&lt;p&gt;The work for this improvement was originally implemented under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61083&quot; title=&quot;Start caching plans that only have a single QuerySolution&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61083&quot;&gt;&lt;del&gt;SERVER-61083&lt;/del&gt;&lt;/a&gt; but then subsequently disabled by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64314&quot; title=&quot;Temporary disable caching of single solution plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64314&quot;&gt;&lt;del&gt;SERVER-64314&lt;/del&gt;&lt;/a&gt; since we observed some subtle correctness issues that were tricky to diagnose. The work for this ticket is to re-enable caching of single solution plans in the SBE plan cache. This will involve investigating and fixing the relevant build failures in addition to reverting the patch from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64314&quot; title=&quot;Temporary disable caching of single solution plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64314&quot;&gt;&lt;del&gt;SERVER-64314&lt;/del&gt;&lt;/a&gt; that temporarily disabled single-solution SBE plan caching.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1996632">SERVER-64315</key>
            <summary>Re-enable caching of single solution plans</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="anton.korshunov@mongodb.com">Anton Korshunov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Mar 2022 10:01:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:26 +0000</updated>
                            <resolved>Wed, 4 May 2022 18:31:46 +0000</resolved>
                                                    <fixVersion>6.0.0-rc5</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="4526507" author="xgen-internal-githook" created="Wed, 4 May 2022 18:11:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64315&quot; title=&quot;Re-enable caching of single solution plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64315&quot;&gt;&lt;del&gt;SERVER-64315&lt;/del&gt;&lt;/a&gt; Re-enable caching of SBE plans when there is a single query solution&lt;/p&gt;

&lt;p&gt;This reverts commit f8589f840c8fee60abc482d2d2c41979e356922a.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f462237ac17a9c8a3e4a5a3fb6bbe6a966d4be85)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a616699c511fb395f3c0c6f53e705b306927a687&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a616699c511fb395f3c0c6f53e705b306927a687&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4524332" author="xgen-internal-githook" created="Wed, 4 May 2022 00:08:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Storch&apos;, &apos;email&apos;: &apos;david.storch@mongodb.com&apos;, &apos;username&apos;: &apos;dstorch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64315&quot; title=&quot;Re-enable caching of single solution plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64315&quot;&gt;&lt;del&gt;SERVER-64315&lt;/del&gt;&lt;/a&gt; Re-enable caching of SBE plans when there is a single query solution&lt;/p&gt;

&lt;p&gt;This reverts commit f8589f840c8fee60abc482d2d2c41979e356922a.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f462237ac17a9c8a3e4a5a3fb6bbe6a966d4be85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f462237ac17a9c8a3e4a5a3fb6bbe6a966d4be85&lt;/a&gt;&lt;/p&gt;</comment>
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