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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-79621] Consider adding a way to figure out the number of measurements in a bucket</title>
                <link>https://jira.mongodb.org/browse/SERVER-79621</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/14369#discussion_r1279952221&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Quoting Irina&apos;s comment here&lt;/a&gt;:&lt;br/&gt;
I believe that we will have to always include _id field even if it isn&apos;t explicitly used in a query because otherwise we won&apos;t be able to identify the gaps at the tail of a column (for queries like &lt;span class=&quot;error&quot;&gt;&amp;#91;{$match: {foo: {$ne: 42}}, {$count: &amp;quot;n&amp;quot;&amp;#93;&lt;/span&gt;), that is we need a guaranteed &quot;dense&quot; field among the paths the stage is deblocking from. I mean, the code here isn&apos;t wrong but we should probably document in the stage&apos;s header that it requires a dense path for correctness (I&apos;ve also added a similar comment to the design doc).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/pull/14369#discussion_r1282107901&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Yoonsoo&apos;s reply&lt;/a&gt;:&lt;br/&gt;
Thanks for pointing this out! This is definitely concerning. Even _id field can be missing like after db.ts.updateMany({}, {$unset: {_id: &quot;&quot;}}). But the time field must always exist. Probably we can always include the time field instead. I think it would be a better option to add a VM builtin function which returns the number of rows in a bucket.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2407258">SERVER-79621</key>
            <summary>Consider adding a way to figure out the number of measurements in a bucket</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2023 16:04:25 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:05 +0000</updated>
                            <resolved>Fri, 4 Aug 2023 23:19:34 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5616184" author="xgen-internal-githook" created="Mon, 7 Aug 2023 02:41:31 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79621&quot; title=&quot;Consider adding a way to figure out the number of measurements in a bucket&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79621&quot;&gt;&lt;del&gt;SERVER-79621&lt;/del&gt;&lt;/a&gt; Have ValueBlock::extract() return dense output&lt;br/&gt;
Branch: minh.luu-no_compile_sys-perf&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c457aea7d6eac9ab87eff0cda7c02ec77fa1e220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c457aea7d6eac9ab87eff0cda7c02ec77fa1e220&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5614942" author="xgen-internal-githook" created="Fri, 4 Aug 2023 23:13:33 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79621&quot; title=&quot;Consider adding a way to figure out the number of measurements in a bucket&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79621&quot;&gt;&lt;del&gt;SERVER-79621&lt;/del&gt;&lt;/a&gt; Have ValueBlock::extract() return dense output&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c457aea7d6eac9ab87eff0cda7c02ec77fa1e220&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c457aea7d6eac9ab87eff0cda7c02ec77fa1e220&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2409924">SERVER-79773</issuekey>
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