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    <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-81788] Optimize $elemMatch in the Boolean expression simplifier</title>
                <link>https://jira.mongodb.org/browse/SERVER-81788</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ol&gt;
	&lt;li&gt;$elemMatch children can be simplified as independent Boolean expressions, then the result could be attached to the parent&apos;s BitsetTree. We will need to modify `restoreMatchExpression` function to handle that case.&lt;/li&gt;
	&lt;li&gt;In the $elemMatch&apos;s parent&apos;s conjunction contains the same terms as the $elemMatch&apos;s conjunction we can remove the terms from the $elemtMatch&apos;s conjunction. E.g. &lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; { &quot;a&quot;: {&quot;id&quot;:1}, &quot;a&quot;:{$elemMatch:{&quot;id&quot;:1, &quot;b&quot;:9} } } == { &quot;a&quot;: {&quot;id&quot;:1}, &quot;a&quot;:{$elemMatch:{&quot;b&quot;:9} } } &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt; see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22857&quot; title=&quot;eliminate redundant conditions/clauses from query&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22857&quot;&gt;&lt;del&gt;SERVER-22857&lt;/del&gt;&lt;/a&gt;&lt;/li&gt;
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                <environment></environment>
        <key id="2457154">SERVER-81788</key>
            <summary>Optimize $elemMatch in the Boolean expression simplifier</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>
                    </labels>
                <created>Tue, 3 Oct 2023 11:58:35 +0000</created>
                <updated>Wed, 1 Nov 2023 15:46:34 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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            <issuekey id="2293273">SERVER-75079</issuekey>
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