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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-80561] Check perf impact of running in hybrid mode for re-written $group with $count</title>
                <link>https://jira.mongodb.org/browse/SERVER-80561</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The re-write of $count is using $size expression that isn&apos;t supported in SBE yet, so without special handling the pipeline will end up running in hybrid mode, with the buckets collection access in SBE and the re-written group in classic. We need to check whether this is negatively affecting perf, and if so, keep the whole pipeline in classic.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2430670">SERVER-80561</key>
            <summary>Check perf impact of running in hybrid mode for re-written $group with $count</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Aug 2023 20:12:45 +0000</created>
                <updated>Sat, 7 Oct 2023 00:09:49 +0000</updated>
                            <resolved>Sat, 7 Oct 2023 00:09:49 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5760841" author="JIRAUSER1259274" created="Sat, 7 Oct 2023 00:09:22 +0000"  >&lt;p&gt;I ran local queries against the tsbs_query dataset and for running in hybrid mode ($group with $size isn&apos;t lowered) independent of how many buckets are served up to the group, the hybrid mode is ~10-15% faster than fully classic. Thus, we are not going to block these pipelines from lowering to SBE.&lt;/p&gt;</comment>
                            <comment id="5739667" author="JIRAUSER1259274" created="Fri, 29 Sep 2023 03:19:57 +0000"  >&lt;p&gt;If $size is implemented in SBE (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80698&quot; title=&quot;Implement $size aggregation expression in SBE&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80698&quot;&gt;SERVER-80698&lt;/a&gt;), the pipeline will be lowered completely and we don&apos;t expect to have a perf hit in this case.&lt;/p&gt;</comment>
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