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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-13181] Investigate changes in SERVER-44327: Add $first and $last expressions</title>
                <link>https://jira.mongodb.org/browse/DOCS-13181</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Adds the $first and $last expressions.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The query team has decided on the following semantics and syntax:&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Name%3A%24first%2Flast&quot;&gt;&lt;/a&gt;Name: $first/last&lt;/h3&gt;
&lt;p&gt;Evaluates to the value at the first (or last) position in the passed in array. Errors if the passed in value is not an array and not nullish. Evaluates to missing if the array is empty, which is consistent with $arrayElemAt&apos;s behavior. Evaluates to null if input is nullish.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Syntax%3A&quot;&gt;&lt;/a&gt;Syntax:&lt;/h4&gt;
&lt;p/&gt;
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					&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;{ $first: &amp;lt;Expression&amp;gt; }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;



&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="984601">DOCS-13181</key>
            <summary>Investigate changes in SERVER-44327: Add $first and $last expressions</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 30 Oct 2019 23:05:58 +0000</created>
                <updated>Mon, 13 Nov 2023 18:14:32 +0000</updated>
                            <resolved>Tue, 21 Jan 2020 22:23:33 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2748656" author="xgen-internal-githook" created="Tue, 21 Jan 2020 22:51:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message:  &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13181&quot; title=&quot;Investigate changes in SERVER-44327: Add $first and $last expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13181&quot;&gt;&lt;del&gt;DOCS-13181&lt;/del&gt;&lt;/a&gt;: fix spelling of accumulator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/3bb7fafaed782369e757a63bc5e2980f5cba0ee3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/3bb7fafaed782369e757a63bc5e2980f5cba0ee3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2748563" author="xgen-internal-githook" created="Tue, 21 Jan 2020 22:22:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13181&quot; title=&quot;Investigate changes in SERVER-44327: Add $first and $last expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13181&quot;&gt;&lt;del&gt;DOCS-13181&lt;/del&gt;&lt;/a&gt;: 4.4 $first and $last agg array operators&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/6f62bcf1a6d75b4b7b3265f63d3391a9435d3aff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/6f62bcf1a6d75b4b7b3265f63d3391a9435d3aff&lt;/a&gt;&lt;/p&gt;</comment>
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