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    <title>MongoDB Jira</title>
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    <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-54235] Implement $count window function desugaring</title>
                <link>https://jira.mongodb.org/browse/SERVER-54235</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;From &lt;a href=&quot;https://docs.google.com/document/d/1IDbgaoEN9ttB9DNPk5mbRIT6S935QaL0HKlKGwOcSHE/edit#heading=h.xm32d6xgcd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Syntax:&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;em&gt;$count&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;This is a new accumulator which returns the number of documents in the current window/partition. In $group, it is identical to {newField: {$sum: 1}} but will only be exposed as a window function. It is an error to specify an input expression to $count, but a non-default window may be specified.&lt;/p&gt;

&lt;p&gt;{newField: {$count: {}, window: ...}}&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;From&#160;&lt;a href=&quot;https://docs.google.com/document/d/1TV4J__OE8A1WRyZ6dWkHcLfi8L6cYk7ejU4ne5oi90A/edit#heading=h.i9mn9ij1otc1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document:&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;A $count window function will be desugared to a $sum with an input expression of the constant &apos;1&apos;. The window definition will remain the same.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1610306">SERVER-54235</key>
            <summary>Implement $count window function desugaring</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="joel.redman@mongodb.com">Joel Redman</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Feb 2021 13:24:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:04 +0000</updated>
                            <resolved>Fri, 30 Apr 2021 03:49:02 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3748042" author="xgen-internal-githook" created="Fri, 30 Apr 2021 03:39:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Joel Redman&apos;, &apos;email&apos;: &apos;joel.redman@mongodb.com&apos;, &apos;username&apos;: &apos;joredman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54235&quot; title=&quot;Implement $count window function desugaring&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54235&quot;&gt;&lt;del&gt;SERVER-54235&lt;/del&gt;&lt;/a&gt; Desugar $count window function as {$sum : 1}&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd131cf1a817713b563bd641bbbe5371b1f4664d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd131cf1a817713b563bd641bbbe5371b1f4664d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1614115">SERVER-54338</issuekey>
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