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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1144] Provide way to give counts of array attributes in projection</title>
                <link>https://jira.mongodb.org/browse/SERVER-1144</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Obtaining counts for large attributes can be a pain. Approaches are to:&lt;br/&gt;
1) Return the entire array and examine length&lt;br/&gt;
2) group/reduce and output the length&lt;br/&gt;
3) map/reduce to get length&lt;br/&gt;
4) ensure documents maintain length attribute across document lifespan&lt;/p&gt;

&lt;p&gt;I think being able to request embedded array length directly would be helpful.&lt;/p&gt;

&lt;p&gt;Perhaps something like:&lt;br/&gt;
db.collection.find({}, {some_array: {$count: true}})&lt;/p&gt;</description>
                <environment></environment>
        <key id="12009">SERVER-1144</key>
            <summary>Provide way to give counts of array attributes in projection</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="crudson">Doug Hudson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 May 2010 12:43:56 +0000</created>
                <updated>Tue, 6 Dec 2022 05:49:22 +0000</updated>
                            <resolved>Fri, 19 May 2017 16:32:50 +0000</resolved>
                                    <version>1.5.1</version>
                                                    <component>Querying</component>
                                        <votes>8</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1575553" author="david.storch" created="Fri, 19 May 2017 16:32:32 +0000"  >&lt;p&gt;Closing as Gone Away per Asya&apos;s comment above. The documentation for the &lt;tt&gt;$size&lt;/tt&gt; expression, which was added in version 2.6, is available here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/size/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/operator/aggregation/size/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1571835" author="asya" created="Tue, 16 May 2017 00:47:00 +0000"  >&lt;p&gt;This can be done via aggregation $project stage using $size expression.&lt;/p&gt;</comment>
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