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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-80734] [CQF] Only sample indexed fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-80734</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Pass appropriate structure to the sampling estimator that contains the set of indexed fields. For a given sargable predicate, check if their field is an indexed field and if so sample, otherwise estimate heuristically.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2434124">SERVER-80734</key>
            <summary>[CQF] Only sample indexed fields</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="chii.huang@mongodb.com">Chi-I Huang</assignee>
                                    <reporter username="svilen.mihaylov@mongodb.com">Svilen Mihaylov</reporter>
                        <labels>
                            <label>M1</label>
                    </labels>
                <created>Tue, 5 Sep 2023 14:25:00 +0000</created>
                <updated>Fri, 3 Nov 2023 23:05:20 +0000</updated>
                            <resolved>Fri, 3 Nov 2023 23:05:20 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5853839" author="xgen-internal-githook" created="Fri, 3 Nov 2023 23:03:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Chi-I Huang&apos;, &apos;email&apos;: &apos;chii.huang@mongodb.com&apos;, &apos;username&apos;: &apos;chiihuang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80734&quot; title=&quot;[CQF] Only sample indexed fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80734&quot;&gt;&lt;del&gt;SERVER-80734&lt;/del&gt;&lt;/a&gt; Sample only if all the field paths of a SargableNode are indexed&lt;/p&gt;

&lt;p&gt;Sample only if all the field paths of a SargableNode are indexed. Otherwise, falls back to &apos;_fallbackCE&apos; to derive cardinality estimation. Note that:&lt;br/&gt;
1. If a query path is  &apos;Get &quot;a&quot; Id&apos; while an index path is &apos;Get &quot;a&quot; Traverse 1 Id&apos;, the query path will be deemed as unindexed and hence we will fall back.&lt;br/&gt;
2. Fix underestimated CE if there is residualReq&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bac34dd6e0504d91950ceaf801b97450910dca0d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bac34dd6e0504d91950ceaf801b97450910dca0d&lt;/a&gt;&lt;/p&gt;</comment>
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