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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-86237] Query fast path for indexed single equality predicates</title>
                <link>https://jira.mongodb.org/browse/SERVER-86237</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using the scaffolding of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83758&quot; title=&quot;Aggressive IDHACK for find&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83758&quot;&gt;SERVER-83758&lt;/a&gt;, we can apply a similar approach for the following queries:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Single field equality predicate (can be dotted path)&lt;/li&gt;
	&lt;li&gt;There exists only one index that has that field as a prefix (can be multi-key)&lt;/li&gt;
	&lt;li&gt;Limit 1 or the index is unique
	&lt;ul&gt;
		&lt;li&gt;This allows us to delay thinking about yielding&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;No sharding
	&lt;ul&gt;
		&lt;li&gt;Shard filter is a residual filter that would require us to think about yielding&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;No projection&lt;/li&gt;
	&lt;li&gt;No sort&lt;/li&gt;
	&lt;li&gt;No numeric paths&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;For queries which fit this description, we can write code to manually perform an index scan + fetch plan by directly calling into the storage APIs, removing the need to construct query execution machinery. These types of plans won&apos;t be cached as they are neither classic or SBE plans.&lt;/p&gt;

&lt;p&gt;We can test the effectiveness of this change by looking at the mixed_workloads_genny_rate_limited_high_value and majority_reads10_k_threads_high_value workloads.&lt;/p&gt;

&lt;p&gt;If we find this approach can improve the performance of these query shapes, we can incrementally remove the restrictions described above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2567541">SERVER-86237</key>
            <summary>Query fast path for indexed single equality predicates</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Mon, 5 Feb 2024 21:26:20 +0000</created>
                <updated>Wed, 7 Feb 2024 16:37:44 +0000</updated>
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