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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-12795] Penalize ixisect during plan scoring so that it won&apos;t get chosen over faster single-index plans</title>
                <link>https://jira.mongodb.org/browse/SERVER-12795</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have seen cases where the multi plan runner cannot distinguish between index intersection and single index plans. For instance, if the query has zero results, then all plans could be equally unproductive, and we have no information to distinguish between the various plans (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12639&quot; title=&quot;Performance regression with RegEx&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12639&quot;&gt;&lt;del&gt;SERVER-12639&lt;/del&gt;&lt;/a&gt;). The ixisect plan might be chosen even if it is dramatically slower than the other plans.&lt;/p&gt;

&lt;p&gt;We should penalize ixisect plans and require them to make up the delta with a no-fetch bonus.&lt;/p&gt;</description>
                <environment></environment>
        <key id="112091">SERVER-12795</key>
            <summary>Penalize ixisect during plan scoring so that it won&apos;t get chosen over faster single-index plans</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="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 21:54:08 +0000</created>
                <updated>Mon, 11 Jul 2016 17:17:14 +0000</updated>
                            <resolved>Mon, 24 Feb 2014 17:59:34 +0000</resolved>
                                    <version>2.5.5</version>
                                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="504222" author="xgen-internal-githook" created="Mon, 24 Feb 2014 17:58:21 +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-12795&quot; title=&quot;Penalize ixisect during plan scoring so that it won&amp;#39;t get chosen over faster single-index plans&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12795&quot;&gt;&lt;del&gt;SERVER-12795&lt;/del&gt;&lt;/a&gt; penalize ixisect while breaking ties during plan scoring&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a9f00ca795116b48abe1396123245502b5aa4590&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a9f00ca795116b48abe1396123245502b5aa4590&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="110313">SERVER-12673</issuekey>
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