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    <title>MongoDB Jira</title>
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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-22741] Ability to hint index intersection</title>
                <link>https://jira.mongodb.org/browse/SERVER-22741</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it&apos;s very hard to trigger index intersection plans, however, if the user knows that it should be beneficial, they should be able to &quot;hint&quot; that to the query optimizer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="266578">SERVER-22741</key>
            <summary>Ability to hint index intersection</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Feb 2016 20:24:06 +0000</created>
                <updated>Tue, 14 Nov 2023 16:33:20 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>17</votes>
                                    <watches>43</watches>
                                                                                                                <comments>
                            <comment id="5750211" author="nuri@plusnconsulting.com" created="Tue, 3 Oct 2023 21:13:46 +0000"  >&lt;p&gt;I would vote for this feature, since intersection has the potential to be a better plan for some workloads.&lt;/p&gt;</comment>
                            <comment id="3724233" author="JIRAUSER1258247" created="Mon, 19 Apr 2021 06:43:55 +0000"  >&lt;p&gt;This feature should be part of a wider effort to implement optimizer hints that allow the enforcement of any plan that is expressible in terms of the execution engine (both classic and SBE).&lt;/p&gt;

&lt;p&gt;This ability is important both for testing and solving customer performance problems. My point&#160; being that we shouldn&apos;t address each case without having a general plan.&lt;/p&gt;</comment>
                            <comment id="3059507" author="sven.maiwald@ottogroup.com" created="Tue, 28 Apr 2020 21:11:05 +0000"  >&lt;p&gt;I would like to vote for this feature, because in our use case the intersection of indices would result in a highly selective behavior when combining two single-field indices with low cardinality.&lt;/p&gt;

&lt;p&gt;How about this syntax, to combine index on field &lt;tt&gt;a&lt;/tt&gt; forward and index on field &lt;tt&gt;b&lt;/tt&gt; backward combined.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&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;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&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;collection.find().hint({$intersect: {a: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;, b: -&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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;}})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;I don&apos;t know if it is possible to self-intersect a wildcard index. But this would bring the overall performance and admistrative gain when running ad-hoc queries on a stable data model.&lt;/p&gt;</comment>
                            <comment id="3026716" author="kreig" created="Mon, 6 Apr 2020 02:46:00 +0000"  >&lt;p&gt;I experimented quite a lot with different setups and MongoDB versions, and I never ever witnessed a situation when query planner chooses an index intersection plan. Small collections with a handful of entries, huge collections with a few billions of documents, different Mongo versions, low end servers or servers with 512GB RAM &#8211; a plan containing the AND_SORTED stage is always rejected, no matter what. The best what I can hope for is the IXSCAN on one of the fields + filtered&#160;FETCH plan. Which of course may completely kill a database when the fetch stage has to reject millions of entries.&lt;/p&gt;

&lt;p&gt;Are there any plans to implement this feature? Or maybe fix the query planner?&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2499638">SERVER-83234</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="12860">SERVER-1649</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="370430">SERVER-28587</issuekey>
        </issuelink>
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