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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-68006] Investigate plan changes due to changes in heuristic estimation</title>
                <link>https://jira.mongodb.org/browse/SERVER-68006</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The implementation of a more detailed heuristic CE in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67166&quot; title=&quot;Heuristic CE for SargableNode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67166&quot;&gt;&lt;del&gt;SERVER-67166&lt;/del&gt;&lt;/a&gt; result in different cardinality estimates than before this task. As a result several plans change. On two occasions the changed plans cause an assertion which is most likely an optimizer bug.&lt;/p&gt;

&lt;p&gt;This bug should investigate the following plan changes in src/mongo/db/query/optimizer/physical_rewriter_optimizer_test.cpp:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;FilterIndexing4 - changes from covering to non-covering plan with heuristic CE - why?&lt;/li&gt;
	&lt;li&gt;FilterIndexingVariable - same&lt;/li&gt;
	&lt;li&gt;IndexResidualReq2 - the Filter node is moved to just before the Seek. Why? Is this still testing the same functionality?&lt;/li&gt;
	&lt;li&gt;IndexPartitioning, IndexPartitioning1 - results in an failed assert when cardinality estimates change. The assert is in physical_rewriter.cpp:  &quot;Must optimize successfully if found compatible properties!&quot;&lt;/li&gt;
	&lt;li&gt;IndexPartitioning1:   The interesting thing is that it doesn&apos;t fail on each test run, but sometimes, which  makes one think the failure depends on rounding errors of cost/cardinality estimates,  which in turn results in different sub-plans.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2089150">SERVER-68006</key>
            <summary>Investigate plan changes due to changes in heuristic estimation</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="13201">Fixed</resolution>
                                        <assignee username="svilen.mihaylov@mongodb.com">Svilen Mihaylov</assignee>
                                    <reporter username="timour.katchaounov@mongodb.com">Timour Katchaounov</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Jul 2022 09:52:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:42 +0000</updated>
                            <resolved>Fri, 12 Aug 2022 14:22:58 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
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