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    <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-64775] Profile perf of SBE $lookup with deep paths in foreign</title>
                <link>https://jira.mongodb.org/browse/SERVER-64775</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The currently proposed implementation creates a set of foreign key values per foreign document and then intersects it with a similar set created from a local document. While this is conceptually correct, we should investigate whether we could avoid creating the foreign set and instead probe for each foreign key value against the local set.&lt;/p&gt;

&lt;p&gt;Because the set is per input document we are not too worried about the excessive memory usage, the main concern is CPU cycles. However, because the empty set of keys should be matched to null and it might require additional stages, probing can end up being as CPU-heavy as materializing the set.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2006199">SERVER-64775</key>
            <summary>Profile perf of SBE $lookup with deep paths in foreign</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="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="irina.yatsenko@mongodb.com">Irina Yatsenko</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                            <label>sbe</label>
                    </labels>
                <created>Tue, 22 Mar 2022 08:56:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:40:45 +0000</updated>
                            <resolved>Wed, 13 Apr 2022 17:32:33 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4466209" author="xgen-internal-githook" created="Thu, 7 Apr 2022 22:55:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Irina Yatsenko&apos;, &apos;email&apos;: &apos;irina.yatsenko@mongodb.com&apos;, &apos;username&apos;: &apos;IrinaYatsenko&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64775&quot; title=&quot;Profile perf of SBE $lookup with deep paths in foreign&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64775&quot;&gt;&lt;del&gt;SERVER-64775&lt;/del&gt;&lt;/a&gt; Do not materialize foreign key values into a set for NLJ&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ba942d67259f686b00a82a7344ed396056cbeebb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ba942d67259f686b00a82a7344ed396056cbeebb&lt;/a&gt;&lt;/p&gt;</comment>
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