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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-79551] Support pathless $count over timeseries</title>
                <link>https://jira.mongodb.org/browse/SERVER-79551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$count query is rewritten as $group+$project over $_internalUnpackBucket stage so it is an include bucket spec but it might have &lt;b&gt;no fields&lt;/b&gt; listed if there is no filter prior to counting. Ideally, we should support lowering such queries to SBE but if producing the right count of &quot;empty documents&quot; from the container stages proves to be tricky we should ensure the perf doesn&apos;t regress (either because it&apos;s OK to lower the prefix of the pipeline or because we block the lowering completely)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2405671">SERVER-79551</key>
            <summary>Support pathless $count over timeseries</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="13203">Gone away</resolution>
                                        <assignee username="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="irina.yatsenko@mongodb.com">Irina Yatsenko</reporter>
                        <labels>
                    </labels>
                <created>Mon, 31 Jul 2023 22:14:29 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:41 +0000</updated>
                            <resolved>Wed, 30 Aug 2023 22:02:06 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5670549" author="JIRAUSER1259274" created="Wed, 30 Aug 2023 22:01:43 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yoonsoo.kim%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;yoonsoo.kim@mongodb.com&quot;&gt;yoonsoo.kim@mongodb.com&lt;/a&gt; Thanks for flagging this! Yes, the recent changes for PM-3324 have modified the plans, created for $count, and we don&apos;t need to worry about the correctness of this scenario anymore though &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80323&quot; title=&quot;Support no measurement fields in $_internalUnpackBucket&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80323&quot;&gt;&lt;del&gt;SERVER-80323&lt;/del&gt;&lt;/a&gt; looks like a similar concern (an include spec with no fields). I&apos;ve also filed &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80561&quot; title=&quot;Check perf impact of running in hybrid mode for re-written $group with $count&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80561&quot;&gt;&lt;del&gt;SERVER-80561&lt;/del&gt;&lt;/a&gt; to follow up on perf for $count queries.&lt;/p&gt;</comment>
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