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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-82887] [CQF] Make sampling in chunks the sampling approach</title>
                <link>https://jira.mongodb.org/browse/SERVER-82887</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Determined the best chunk size and implement as default setting. Tweak tests as needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2492952">SERVER-82887</key>
            <summary>[CQF] Make sampling in chunks the sampling approach</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>
                    </labels>
                <created>Tue, 7 Nov 2023 18:11:46 +0000</created>
                <updated>Wed, 29 Nov 2023 21:37:33 +0000</updated>
                            <resolved>Mon, 20 Nov 2023 20:11:37 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5913678" author="xgen-internal-githook" created="Wed, 29 Nov 2023 20:15:05 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83310&quot; title=&quot;[CQF] Explain assertions in range_descending.js are unstable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83310&quot;&gt;&lt;del&gt;SERVER-83310&lt;/del&gt;&lt;/a&gt; Make range_descending.js stable by adjusting distribution&lt;/p&gt;

&lt;p&gt;The purpose of this test is to confirm correct results when we choose an&lt;br/&gt;
IndexScan where some fields are descending. The goal is not to confirm&lt;br/&gt;
that a particular plan wins.&lt;/p&gt;

&lt;p&gt;The query we&apos;re testing has two predicates: on &apos;a&apos; and &apos;b&apos;, and in the&lt;br/&gt;
example data these predicates are fully correlated. When we enabled&lt;br/&gt;
sampling in pairs, we make a separate estimate for &apos;a&apos; and &apos;a ^ b&apos;.&lt;br/&gt;
Because sampling is random it&apos;s possible for the &apos;a ^ b&apos; estimate to be&lt;br/&gt;
higher than the &apos;a&apos; estimate, which makes the optimizer think it&apos;s&lt;br/&gt;
beneficial to defer filtering on &apos;b&apos; as long as possible.&lt;/p&gt;

&lt;p&gt;This commit fixes the test by changing the data distribution so that&lt;br/&gt;
filtering on &apos;b&apos; is always beneficial, even once we&apos;ve already filtered&lt;br/&gt;
on &apos;a&apos;. (As it turns out &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82887&quot; title=&quot;[CQF] Make sampling in chunks the sampling approach&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82887&quot;&gt;&lt;del&gt;SERVER-82887&lt;/del&gt;&lt;/a&gt; already included this change.)&lt;/p&gt;

&lt;p&gt;It also improves the error messages in navigateToPath(), to disambiguate&lt;br/&gt;
which component of the path was missing (as in .child.child.child) and&lt;br/&gt;
to print the overall plan in addition to the subtree.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/20514a684a85a15470b0b1f907c426ef9e415b1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/20514a684a85a15470b0b1f907c426ef9e415b1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5893292" author="xgen-internal-githook" created="Mon, 20 Nov 2023 19:21:31 +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-82887&quot; title=&quot;[CQF] Make sampling in chunks the sampling approach&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82887&quot;&gt;&lt;del&gt;SERVER-82887&lt;/del&gt;&lt;/a&gt; Set default sampling chunk size to 10&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d1decdc80862f3d5f86693ddbb76b0599a4bdbf7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d1decdc80862f3d5f86693ddbb76b0599a4bdbf7&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2385760">SERVER-78764</issuekey>
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