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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-86194] Improve MatchExpression $or-&gt;$in rewrite to handle multiple fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-86194</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the MatchExpression $or-&amp;gt;$in rewrite is only capable of collapsing a single field with multiple equality disjunctions into a $in. For example,&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;is optimized to&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This leads to an SBE plan with a large number of unnecessary comparisons. SBE is able to evaluate $in predicates more efficiently by using a hashset, and the interval builder is able to generate index bounds more easily on an $in list.&lt;/p&gt;

&lt;p&gt;These expressions can be further reduce by allowing the $or-&amp;gt;$in rewrite to handle multiple fields.&lt;/p&gt;

&lt;p&gt;There are two high-value workloads (&lt;a href=&quot;https://github.com/mongodb/genny/blob/df26e88e1609840df5fb5ac041ac9ed8cfdd7cc4/src/phases/query/FilterWithComplexLogicalExpression.yml#L262-L289&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MatchExpressionWidePredicate&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/genny/blob/df26e88e1609840df5fb5ac041ac9ed8cfdd7cc4/src/phases/query/FilterWithComplexLogicalExpression.yml#L360-L387&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MatchExpressionWidePredicateWithDeepFieldpaths&lt;/a&gt;) which could be improved by this optimization.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2566060">SERVER-86194</key>
            <summary>Improve MatchExpression $or-&gt;$in rewrite to handle multiple fields</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="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="militsa.sotirova@mongodb.com">Militsa Sotirova</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Sat, 3 Feb 2024 02:05:06 +0000</created>
                <updated>Tue, 6 Feb 2024 16:11:44 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
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