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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-44327] Add $first and $last expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-44327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="984600">SERVER-44327</key>
            <summary>Add $first and $last expressions</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>pm1457</label>
                    </labels>
                <created>Wed, 30 Oct 2019 23:02:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:33 +0000</updated>
                            <resolved>Mon, 25 Nov 2019 23:30:25 +0000</resolved>
                                                    <fixVersion>4.3.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2565610" author="xgen-internal-githook" created="Mon, 25 Nov 2019 23:28:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;name&apos;: &apos;David Percy&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44327&quot; title=&quot;Add $first and $last expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44327&quot;&gt;&lt;del&gt;SERVER-44327&lt;/del&gt;&lt;/a&gt; Add $first and $last expressions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34e093782f53dec39ff89116c0c7128430c99bae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34e093782f53dec39ff89116c0c7128430c99bae&lt;/a&gt;&lt;/p&gt;</comment>
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