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    <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-13236] Consider not enumerating index intersection solutions unless the AND is top-level</title>
                <link>https://jira.mongodb.org/browse/SERVER-13236</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suppose we have indices on &apos;a&apos;, &apos;b&apos;, and we receive the following query:&lt;/p&gt;
&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.coll.find({$or: [{a: 1, b: 1}, {a: 2, b: 2}]});&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;We could end up enumerating 9 possible solutions, as there are three possibilities for each branch (use &apos;a&apos;, use &apos;b&apos;, and use index intersection). If all combinations are considered than 3 * 3 = 9. This is the search space explosion problem for $or that is currently being tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13184&quot; title=&quot;2.6 should explore same number of one index solns as 2.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13184&quot;&gt;&lt;del&gt;SERVER-13184&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regardless of the approach taken for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13184&quot; title=&quot;2.6 should explore same number of one index solns as 2.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13184&quot;&gt;&lt;del&gt;SERVER-13184&lt;/del&gt;&lt;/a&gt;, we can mitigate the problem by not enumerating index intersection solutions if the AND is not top-level. For the example above, this would reduce the number of possibilities to 2 * 2 = 4.&lt;/p&gt;</description>
                <environment></environment>
        <key id="121870">SERVER-13236</key>
            <summary>Consider not enumerating index intersection solutions unless the AND is top-level</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Mar 2014 20:36:10 +0000</created>
                <updated>Wed, 21 Oct 2015 16:17:41 +0000</updated>
                            <resolved>Wed, 21 Oct 2015 16:17:41 +0000</resolved>
                                    <version>2.6.0-rc1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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            <issuekey id="120171">SERVER-13184</issuekey>
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