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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-85024] Histogram-based cardinality estimation for conjunctions</title>
                <link>https://jira.mongodb.org/browse/SERVER-85024</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are several options to explore here, and its not clear of the advantages of each:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Option 0: simple scaling factor&lt;/li&gt;
	&lt;li&gt;Option 1: use set of samples to estimate correlation rather than simple scaling factor&lt;/li&gt;
	&lt;li&gt;Option 2: exponential backoff&lt;/li&gt;
	&lt;li&gt;Option 3: Use NDVs for each field as a weighting mechanism (not sure if this is the approach described by Milena or not)&lt;/li&gt;
	&lt;li&gt;Option 4: Multi-field histograms (would require equality on prefix predicate?)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The 4th option is out of scope for this ticket but would be worth considering down the line.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1859151">SERVER-85024</key>
            <summary>Histogram-based cardinality estimation for conjunctions</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>next-stats-spike-candidate</label>
                    </labels>
                <created>Tue, 24 Aug 2021 18:12:37 +0000</created>
                <updated>Sat, 13 Jan 2024 01:03:03 +0000</updated>
                            <resolved>Mon, 18 Oct 2021 19:14:29 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4130453" author="charlie.swanson" created="Mon, 18 Oct 2021 19:14:29 +0000"  >&lt;p&gt;We did not have time to pursue this during the spike so I am closing it out. I invented a new &quot;next-stats-spike-candidate&quot; label if we want to find things like this later.&lt;/p&gt;</comment>
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