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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-71551] Follow up unit tests with overriden Cost Model in physical_rewriter_optimizer_test.cpp</title>
                <link>https://jira.mongodb.org/browse/SERVER-71551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The new Cost Model introduces ABT nodes startup costs and makes IndexScan plans relatively more expansive then PhysicalScan on smaller collections. It laso makes index intersection plans with HashJoin and MergeJoin more expensive comparing to plain IndexScan plans which sometimes make IndexScan plan more preferable over index intersection plans.&lt;/p&gt;

&lt;p&gt;As a result, we have added CostModel overrides to some of the Physical Rewriter unit tests.&lt;/p&gt;

&lt;p&gt;This ticket is created to keep track of the overrides and can be resolved by a combination of the following:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;the Cost Model is recalibrated&lt;/li&gt;
	&lt;li&gt;more stable optimizer (it can sometimes generate different plans on the same data and the same CostModel)&lt;/li&gt;
	&lt;li&gt;the tests are modified to force the desired plans&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2192492">SERVER-71551</key>
            <summary>Follow up unit tests with overriden Cost Model in physical_rewriter_optimizer_test.cpp</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
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                <created>Tue, 22 Nov 2022 20:10:30 +0000</created>
                <updated>Mon, 5 Dec 2022 20:09:52 +0000</updated>
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