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    <title>MongoDB Jira</title>
    <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>[DOCS-8144] Document new $count aggregation stage for the 3.4 manual</title>
                <link>https://jira.mongodb.org/browse/DOCS-8144</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23836&quot; title=&quot;add $count stage to aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23836&quot;&gt;&lt;del&gt;SERVER-23836&lt;/del&gt;&lt;/a&gt; added a new aggregation stage &lt;tt&gt;$count&lt;/tt&gt; that is syntactic sugar for {&lt;tt&gt;$group:{_id:null, count:{$sum:1&lt;/tt&gt;}}}.&lt;/p&gt;

&lt;p&gt;We need to add a new reference page giving usage information and examples.&lt;/p&gt;</description>
                <environment></environment>
        <key id="295528">DOCS-8144</key>
            <summary>Document new $count aggregation stage for the 3.4 manual</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="steve.renaker@mongodb.com">Steve Renaker</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 21 Jun 2016 16:03:25 +0000</created>
                <updated>Tue, 22 Nov 2016 21:49:48 +0000</updated>
                            <resolved>Fri, 11 Nov 2016 18:19:13 +0000</resolved>
                                                    <fixVersion>3.4.0</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1440583" author="xgen-internal-githook" created="Tue, 22 Nov 2016 21:49:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message:  &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8144&quot; title=&quot;Document new $count aggregation stage for the 3.4 manual&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8144&quot;&gt;&lt;del&gt;DOCS-8144&lt;/del&gt;&lt;/a&gt; : fix bad copy+paste&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/2953cca87953fef4dbe2a5bfb86f975b5c6bb8db&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/2953cca87953fef4dbe2a5bfb86f975b5c6bb8db&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1440512" author="xgen-internal-githook" created="Tue, 22 Nov 2016 20:44:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8144&quot; title=&quot;Document new $count aggregation stage for the 3.4 manual&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8144&quot;&gt;&lt;del&gt;DOCS-8144&lt;/del&gt;&lt;/a&gt; count is a pipeline not expression&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/4c965044067978baa909a0c90c559f5271036427&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/4c965044067978baa909a0c90c559f5271036427&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1432283" author="xgen-internal-githook" created="Fri, 11 Nov 2016 20:08:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8144&quot; title=&quot;Document new $count aggregation stage for the 3.4 manual&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8144&quot;&gt;&lt;del&gt;DOCS-8144&lt;/del&gt;&lt;/a&gt;: updates to $count example&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/70ac4e1e545e77dfcb229f1d3afcd27c3e9d579f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/70ac4e1e545e77dfcb229f1d3afcd27c3e9d579f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1432282" author="xgen-internal-githook" created="Fri, 11 Nov 2016 20:08:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;steveren&apos;, u&apos;name&apos;: u&apos;Steve Renaker&apos;, u&apos;email&apos;: u&apos;steve.renaker@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-8144&quot; title=&quot;Document new $count aggregation stage for the 3.4 manual&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-8144&quot;&gt;&lt;del&gt;DOCS-8144&lt;/del&gt;&lt;/a&gt;: $count aggregation stage&lt;/p&gt;

&lt;p&gt;Signed-off-by: kay &amp;lt;kay.kim@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/7b9c63e98760caa8d30c2ce250c8b5df0b015ec6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/7b9c63e98760caa8d30c2ce250c8b5df0b015ec6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1431811" author="asya" created="Fri, 11 Nov 2016 11:39:04 +0000"  >&lt;p&gt;this stage is not listed in the 3.4 release notes anywhere.&lt;/p&gt;</comment>
                            <comment id="1397919" author="rstam" created="Fri, 30 Sep 2016 18:20:35 +0000"  >&lt;p&gt;To be more precise, I think that:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ $count : &quot;count&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;is actually syntactic sugar for:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ $group : { _id : null, count : { $sum : 1 } } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ $project : { _id : 0 } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Without the $project the results would be different.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
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                                        <issuelink>
            <issuekey id="281231">SERVER-23836</issuekey>
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