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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12796] Consider not caching plans if all candidates are equally unproductive</title>
                <link>https://jira.mongodb.org/browse/SERVER-12796</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If none of the candidate plans produce or hit EOF while picking the best plan, then we currently choose a plan arbitrarily and cache it. We should consider &lt;em&gt;not&lt;/em&gt; caching the plan in this case, since we don&apos;t have much information suggesting that it is better than the other candidates.&lt;/p&gt;</description>
                <environment></environment>
        <key id="112093">SERVER-12796</key>
            <summary>Consider not caching plans if all candidates are equally unproductive</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Feb 2014 21:59:42 +0000</created>
                <updated>Mon, 11 Jul 2016 17:19:29 +0000</updated>
                            <resolved>Tue, 25 Feb 2014 14:58:54 +0000</resolved>
                                    <version>2.5.5</version>
                                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="504817" author="xgen-internal-githook" created="Tue, 25 Feb 2014 14:55:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12796&quot; title=&quot;Consider not caching plans if all candidates are equally unproductive&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12796&quot;&gt;&lt;del&gt;SERVER-12796&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12829&quot; title=&quot;adding projection causes multiKey index query fall back to collection scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12829&quot;&gt;&lt;del&gt;SERVER-12829&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12830&quot; title=&quot;query does not select best index - uses wrong bounds in full explain&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12830&quot;&gt;&lt;del&gt;SERVER-12830&lt;/del&gt;&lt;/a&gt; better plan ranking in the case of EOF or zero results produced&lt;/p&gt;

&lt;p&gt;If the winning plan returns zero results but does not hit EOF, then we no longer cache it.&lt;/p&gt;

&lt;p&gt;Fixes a bug which would allow plans that did not hit EOF in the multi plan runner to be chosen over EOF plans.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8bf16f9e54e61a6befa791a6378ffdd06ad35a5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8bf16f9e54e61a6befa791a6378ffdd06ad35a5b&lt;/a&gt;&lt;/p&gt;</comment>
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