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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-27835] add aggregation stage $countBy which is equivalent to group with sum</title>
                <link>https://jira.mongodb.org/browse/SERVER-27835</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be nice to have syntactic sugar for the following stage which I type all the time:&lt;/p&gt;

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&lt;p/&gt;

&lt;p&gt;Something like  {&lt;tt&gt;$countBy:&quot;$field&quot;&lt;/tt&gt;} would be more readable and be analogous to $count and $sortByCount stages (and would use same field names as sortByCount - i.e. count field for sum)&lt;/p&gt;
</description>
                <environment></environment>
        <key id="349733">SERVER-27835</key>
            <summary>add aggregation stage $countBy which is equivalent to group with sum</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>expression</label>
                    </labels>
                <created>Fri, 27 Jan 2017 15:31:35 +0000</created>
                <updated>Tue, 6 Dec 2022 04:07:12 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
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