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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-18733] Streamline set cache optimization for set operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-18733</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the $project stage of the aggregation framework one set operation ($setIsSubset) has a performance optimization (caching a constant set) which provides tremendous benefits if the set used is big enough.&lt;/p&gt;

&lt;p&gt;I think it would be nice to streamline this optimization to all set operations as it is easy to implement and they could benefit from it.&lt;/p&gt;

&lt;p&gt;Here is the link to the code implementing this optimization: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/expression.cpp#L2354&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/pipeline/expression.cpp#L2354&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="207267">SERVER-18733</key>
            <summary>Streamline set cache optimization for set operations</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="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="antoine.hom@amadeus.com">Antoine Hom</reporter>
                        <labels>
                            <label>asya</label>
                            <label>optimization</label>
                    </labels>
                <created>Fri, 29 May 2015 11:23:14 +0000</created>
                <updated>Tue, 6 Dec 2022 04:50:40 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="927125" author="antoine.hom@amadeus.com" created="Fri, 29 May 2015 11:44:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18734&quot; title=&quot;The match $in operator is using a ValueSet(std::set)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18734&quot;&gt;&lt;del&gt;SERVER-18732&lt;/del&gt;&lt;/a&gt; Explains the background of why we tried to use big sets in set operations.&lt;/p&gt;</comment>
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