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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-84713] Ensure the child of a SargableNode is always a ScanNode after substitution phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-84713</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the child of a SargableNode is &lt;em&gt;not&lt;/em&gt; always a ScanNode after the substitution phase. This happens when the SargableMerge fails to merge two SargableNode (e.g. one of them has non-singleton disjunction requirement) in the substitution phase. Such SargableNode will remain in memo until the exploration phase.&lt;/p&gt;

&lt;p&gt;Due to this, a SamplingEstimator may encounter such SargableNode and has to fall back to heuristic estimation without an additional check.&lt;br/&gt;
&#160;&lt;br/&gt;
To address that:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Create a SubstituteConvert&amp;lt;SargableNode&amp;gt; rewrite which converts SargableNode back to a FilterNode like what ExploreConvert&amp;lt;Sargablenode&amp;gt; does today by calling lowerSargableNode(sargableNode, ctx).&lt;/li&gt;
	&lt;li&gt;Update the TODO in the sampling_estimator.cpp into an assertion such that the child of a SargableNode is always a ScanNode.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2541321">SERVER-84713</key>
            <summary>Ensure the child of a SargableNode is always a ScanNode after substitution phase</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="chii.huang@mongodb.com">Chi-I Huang</reporter>
                        <labels>
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                <created>Tue, 9 Jan 2024 23:19:17 +0000</created>
                <updated>Thu, 18 Jan 2024 23:06:18 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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