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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-83270] Avoid sorting $in list when it gets converted to KeyString</title>
                <link>https://jira.mongodb.org/browse/SERVER-83270</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Often we will sort the BSON elements of a $in list early in query processing. Sorting BSON elements is usually fairly slow, and for short running query, this takes a significant amount of the runtime.&lt;/p&gt;

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

&lt;p&gt;Sometimes, this $in list gets converted to KeyStrings, which are used for index bounds. KeyStrings are very easy/fast to compare, so we should try to delay the sorting of the $in list elements until after the KeyStrings are generated.&lt;/p&gt;

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

&lt;p&gt;This will not be possible in all cases, but should be a minor perf win for $in queries that get answered with ixscan/fetch plans. For example, a query that fetches a bunch of documents via a $in on _id.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2500764">SERVER-83270</key>
            <summary>Avoid sorting $in list when it gets converted to KeyString</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="militsa.sotirova@mongodb.com">Militsa Sotirova</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                            <label>query-perf-q4</label>
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                <created>Wed, 15 Nov 2023 14:05:00 +0000</created>
                <updated>Fri, 2 Feb 2024 23:22:24 +0000</updated>
                                                                                                <votes>1</votes>
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