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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-80733] [CQF] Sample two fields at a time</title>
                <link>https://jira.mongodb.org/browse/SERVER-80733</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For sargable nodes, identify promising pairs of fields and sample them together.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2434121">SERVER-80733</key>
            <summary>[CQF] Sample two fields at a time</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="13201">Fixed</resolution>
                                        <assignee username="daniel.segel@mongodb.com">Daniel Segel</assignee>
                                    <reporter username="svilen.mihaylov@mongodb.com">Svilen Mihaylov</reporter>
                        <labels>
                            <label>M1</label>
                    </labels>
                <created>Tue, 5 Sep 2023 14:23:20 +0000</created>
                <updated>Fri, 10 Nov 2023 14:00:22 +0000</updated>
                            <resolved>Tue, 7 Nov 2023 20:05:04 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5861870" author="xgen-internal-githook" created="Tue, 7 Nov 2023 20:02:08 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Segel&apos;, &apos;email&apos;: &apos;daniel.segel@mongodb.com&apos;, &apos;username&apos;: &apos;dhsegel&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80733&quot; title=&quot;[CQF] Sample two fields at a time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80733&quot;&gt;&lt;del&gt;SERVER-80733&lt;/del&gt;&lt;/a&gt; Sample two fields at a time using most common fields or most common pair&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3123d4df5d434fbe71e8e36662f2acd098c3ed1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3123d4df5d434fbe71e8e36662f2acd098c3ed1f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5739922" author="JIRAUSER1273272" created="Fri, 29 Sep 2023 07:33:21 +0000"  >&lt;p&gt;When doing this you will need to consider the statistical independence of the two fields. Sampling each of the fields independently and sampling them together might result in different results if the fields are correlated with each-other. This should be verified by someone very firm in statistics and probability theory before implementing as this can have a huge impact on the accuracy of the CE.&#160;&lt;/p&gt;</comment>
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