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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-83122] Optimize field projection in limit-sort pipeline in sbe</title>
                <link>https://jira.mongodb.org/browse/SERVER-83122</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With recent change &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79862&quot; title=&quot;Exponential batch size growth in DocumentSourceCursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79862&quot;&gt;&lt;del&gt;SERVER-79862&lt;/del&gt;&lt;/a&gt;, some classic workloads had improved performance resulting in regression in some tests in sbe perf dashboard&lt;/p&gt;</description>
                <environment></environment>
        <key id="2496838">SERVER-83122</key>
            <summary>Optimize field projection in limit-sort pipeline in sbe</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="foteini.alvanaki@mongodb.com">Foteini Alvanaki</assignee>
                                    <reporter username="projjal.chanda@mongodb.com">Projjal Chanda</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Nov 2023 15:42:17 +0000</created>
                <updated>Thu, 21 Dec 2023 12:29:26 +0000</updated>
                            <resolved>Thu, 7 Dec 2023 13:18:05 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5932290" author="xgen-internal-githook" created="Thu, 7 Dec 2023 11:32:57 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Foteini Alvanaki&apos;, &apos;email&apos;: &apos;foteini.alvanaki@mongodb.com&apos;, &apos;username&apos;: &apos;&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83122&quot; title=&quot;Optimize field projection in limit-sort pipeline in sbe&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83122&quot;&gt;&lt;del&gt;SERVER-83122&lt;/del&gt;&lt;/a&gt; Retrieve fields after sorting when pipeline has limit&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 68358060ebc028af5c8b51cb1e26b0c74e0458f0&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7eb9602a2f25422d3e075c01140aa4c6b9141fbd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7eb9602a2f25422d3e075c01140aa4c6b9141fbd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5906486" author="JIRAUSER1272665" created="Mon, 27 Nov 2023 17:35:31 +0000"  >&lt;p&gt;There is regression in sbe in &lt;a href=&quot;https://github.com/mongodb/genny/blob/master/src/workloads/query/locf.yml#L227-L503&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;workloads&lt;/a&gt; where the window stage is followed by a (small) $limit, and preceded by a sort stage.&lt;/p&gt;

&lt;p&gt;The sort stage desugared from $setWindowFields executes in sbe. When the window stage is in sbe, it pushes down its required fields through the sort stage in addition to result object, while when the window stage is in classic the sort stage in sbe only holds result object. So in fullsbe, there is higher allocations and cache pressure in the sort stage with these extra fields, resulting in slower sort. This is not an issue generally since the following stages will benefit from direct access to the required fields. But when we have a $limit (with a small limit) after the window stage, the sort stage still has to sort all the documents in the collection. So the sort stage completely dominates the execution time and the slower sort in case of fullSbe makes the overall query slower.&lt;/p&gt;</comment>
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