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    <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>
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<item>
            <title>[SERVER-58587] Improve performance of $setIsSubset by replacing std::set with an unordered set</title>
                <link>https://jira.mongodb.org/browse/SERVER-58587</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The $setIsSubset currently uses std::set to creating a lookup table on the RHS array elements. We should replace this with stdx::unordered_set which provides 3-4x performance for large data sets. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1820277">SERVER-58587</key>
            <summary>Improve performance of $setIsSubset by replacing std::set with an unordered set</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="rui.liu@mongodb.com">Rui Liu</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Jul 2021 15:02:58 +0000</created>
                <updated>Sun, 29 Oct 2023 21:50:50 +0000</updated>
                            <resolved>Thu, 5 Aug 2021 09:23:56 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4107124" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:18:02 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3984687" author="xgen-internal-githook" created="Fri, 6 Aug 2021 08:52:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58587&quot; title=&quot;Improve performance of $setIsSubset by replacing std::set with an unordered set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58587&quot;&gt;&lt;del&gt;SERVER-58587&lt;/del&gt;&lt;/a&gt; Improve performance of $setIsSubset by replacing std::set with an unordered set&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f0defdba5d5839e4cbfd3b0fa69fb8369419ded4)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0df1ecc5133a17f8af0b58079f6ef8c910970739&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0df1ecc5133a17f8af0b58079f6ef8c910970739&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3982766" author="xgen-internal-githook" created="Thu, 5 Aug 2021 13:49:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58587&quot; title=&quot;Improve performance of $setIsSubset by replacing std::set with an unordered set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58587&quot;&gt;&lt;del&gt;SERVER-58587&lt;/del&gt;&lt;/a&gt; Improve performance of $setIsSubset by replacing std::set with an unordered set&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f0defdba5d5839e4cbfd3b0fa69fb8369419ded4)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/900f813705c5eb7b6ba6260ec78be7880c866934&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/900f813705c5eb7b6ba6260ec78be7880c866934&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3980062" author="xgen-internal-githook" created="Wed, 4 Aug 2021 11:15:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Rui Liu&apos;, &apos;email&apos;: &apos;lriuui0x0@gmail.com&apos;, &apos;username&apos;: &apos;lriuui0x0&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58587&quot; title=&quot;Improve performance of $setIsSubset by replacing std::set with an unordered set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58587&quot;&gt;&lt;del&gt;SERVER-58587&lt;/del&gt;&lt;/a&gt; Improve performance of $setIsSubset by replacing std::set with an unordered set&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f0defdba5d5839e4cbfd3b0fa69fb8369419ded4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f0defdba5d5839e4cbfd3b0fa69fb8369419ded4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3956858" author="JIRAUSER1259232" created="Thu, 22 Jul 2021 07:51:28 +0000"  >&lt;p&gt;For Rui&apos;s 2nd ticket. Detailed explaination in the HELP ticket.&lt;/p&gt;</comment>
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