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    <title>MongoDB Jira</title>
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    <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-12873] dbtest for plan ranking</title>
                <link>https://jira.mongodb.org/browse/SERVER-12873</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We currently don&apos;t have any tests for plan ranking. Such tests would specify the indices, data, and query, and then show that ranking chooses the right plan.&lt;/p&gt;

&lt;p&gt;Some interesting cases include, but are not limited to:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Two plans hit EOF at the same time, but one is covered. Make sure that we prefer the covered plan.&lt;/li&gt;
	&lt;li&gt;A query where using an index requires us to look at the entire collection. In this case, a collection scan will hit EOF first and should win.&lt;/li&gt;
	&lt;li&gt;No plan produces any results or hits EOF. In this case we should never choose an index intersection solution.&lt;/li&gt;
	&lt;li&gt;No plan produces any results or hits EOF. In this case we should prefer covered solutions to non-covered solutions.&lt;/li&gt;
	&lt;li&gt;We have an index on &quot;a&quot; which is somewhat selective and an index on &quot;b&quot; which is highly selective (will cause an immediate EOF). Make sure that a query with predicates on both &quot;a&quot; and &quot;b&quot; will use the index on &quot;b&quot;.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="114168">SERVER-12873</key>
            <summary>dbtest for plan ranking</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="9">Done</resolution>
                                        <assignee username="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Feb 2014 23:20:14 +0000</created>
                <updated>Mon, 11 Jul 2016 17:18:28 +0000</updated>
                            <resolved>Wed, 26 Feb 2014 02:25:17 +0000</resolved>
                                    <version>2.6.0-rc0</version>
                                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="505439" author="xgen-internal-githook" created="Wed, 26 Feb 2014 02:25:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hkhalsa&apos;, u&apos;name&apos;: u&apos;Hari Khalsa&apos;, u&apos;email&apos;: u&apos;hkhalsa@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12873&quot; title=&quot;dbtest for plan ranking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12873&quot;&gt;&lt;del&gt;SERVER-12873&lt;/del&gt;&lt;/a&gt; add more plan ranking dbtests&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fafbd01bda9ef5a0969a56365d0af9ce4a4fc689&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fafbd01bda9ef5a0969a56365d0af9ce4a4fc689&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="504991" author="xgen-internal-githook" created="Tue, 25 Feb 2014 18:14:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hkhalsa&apos;, u&apos;name&apos;: u&apos;Hari Khalsa&apos;, u&apos;email&apos;: u&apos;hkhalsa@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12873&quot; title=&quot;dbtest for plan ranking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12873&quot;&gt;&lt;del&gt;SERVER-12873&lt;/del&gt;&lt;/a&gt; begin dbtest file for plan ranking, add force-ixisect flag for qa&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/03b5eae78c653d7eb11df4ce26b9b28833e95e62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/03b5eae78c653d7eb11df4ce26b9b28833e95e62&lt;/a&gt;&lt;/p&gt;</comment>
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