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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-83248] [CQF] Log each cardinality estimation</title>
                <link>https://jira.mongodb.org/browse/SERVER-83248</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During optimization, OptPhaseManager makes many calls into the CardinalityEstimator interface for different predicates.  The results can be nondeterministic (based on sampling), and the CE method can depend on many configuration options.&lt;/p&gt;

&lt;p&gt;When debugging from the mongo shell, we often want to know why the wrong plan was chosen, or why it varies from run to run.  The answer has to do with how the CE varies from run to run.&lt;/p&gt;

&lt;p&gt;Let&apos;s add a log line on every CE call that includes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;the predicate that was estimated&lt;/li&gt;
	&lt;li&gt;the estimate&lt;/li&gt;
	&lt;li&gt;the CE method&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This should be at a low severity, not logged by default in a production server, but could be enabled by default in CQF tests later.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2500029">SERVER-83248</key>
            <summary>[CQF] Log each cardinality estimation</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="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Nov 2023 20:35:45 +0000</created>
                <updated>Fri, 8 Dec 2023 19:07:34 +0000</updated>
                            <resolved>Fri, 8 Dec 2023 19:07:33 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5934729" author="xgen-internal-githook" created="Fri, 8 Dec 2023 00:53:41 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83248&quot; title=&quot;[CQF] Log each cardinality estimation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83248&quot;&gt;&lt;del&gt;SERVER-83248&lt;/del&gt;&lt;/a&gt; Log each deriveCE() call&lt;/p&gt;

&lt;p&gt;Also add a separate log component for query/optimizer/ and query/ce/,&lt;br/&gt;
and fix an incorrect comment.&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 0e4d87290bf69d458befe29882294de24e38ec88&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/23c345700c6912ca3b9a75aec28fc87e735795db&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/23c345700c6912ca3b9a75aec28fc87e735795db&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5934589" author="david.percy" created="Thu, 7 Dec 2023 23:25:03 +0000"  >&lt;p&gt;Updated the description to reflect that we&apos;re not updating the default log verbosity of any test suites in this ticket.&lt;/p&gt;</comment>
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