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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-82238] Add field to explain to indicate if winning and rejected plans are cached</title>
                <link>https://jira.mongodb.org/browse/SERVER-82238</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To aid in support cases and allow explain to convey information about the cached plan (since usually it is ignored), we should add an &quot;isCached&quot; field to all plans listed in explain. This will be a boolean to indicate whether the plan matches the cached plan.&lt;/p&gt;

&lt;p&gt;For support cases where a bad plan is cached and the user runs explain and sees a different plan reported, the issue will be more obvious. We can also add a top level field &quot;doesWinningPlanMatchCached&quot; to surface this even higher.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2475673">SERVER-82238</key>
            <summary>Add field to explain to indicate if winning and rejected plans are cached</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="matt.boros@mongodb.com">Matt Boros</assignee>
                                    <reporter username="matt.boros@mongodb.com">Matt Boros</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Oct 2023 19:06:04 +0000</created>
                <updated>Wed, 3 Jan 2024 20:53:39 +0000</updated>
                            <resolved>Thu, 28 Dec 2023 22:25:29 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5974053" author="xgen-internal-githook" created="Thu, 28 Dec 2023 18:27:54 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Boros&apos;, &apos;email&apos;: &apos;mattBoros@users.noreply.github.com&apos;, &apos;username&apos;: &apos;mattBoros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82238&quot; title=&quot;Add field to explain to indicate if winning and rejected plans are cached&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82238&quot;&gt;&lt;del&gt;SERVER-82238&lt;/del&gt;&lt;/a&gt; Add &quot;isCached&quot; field to winning and rejected plans in explain (#15468)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 1ce84ae1bac7fc36edcabc29bad9abf6c3027bf2&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7cf5597d539bad8892380ed86a84d0fe96dfcd01&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7cf5597d539bad8892380ed86a84d0fe96dfcd01&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5934120" author="JIRAUSER1253388" created="Thu, 7 Dec 2023 20:10:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82242&quot; title=&quot; Implement QuerySolution hash and store in plan cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82242&quot;&gt;&lt;del&gt;SERVER-82242&lt;/del&gt;&lt;/a&gt; is complete. I&apos;ve changed the original code review to use hashes instead of position in the QueryPlanner::plan list. &lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/15468&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/pull/15468&lt;/a&gt;&lt;/p&gt;</comment>
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                    <name>Depends</name>
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                                        <issuelink>
            <issuekey id="2475721">SERVER-82242</issuekey>
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            <issuekey id="179106">SERVER-16895</issuekey>
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                            <customfieldvalue>There is an additional field in explain plans called &amp;quot;isCached&amp;quot;. If it is true it means this plan is in the plan cache. If false, it means the plan is not in the plan cache. This may be true for at most one plan in explain (there will never be two plans marked isCached=true).</customfieldvalue>

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