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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>
    </build-info>


<item>
            <title>[SERVER-42784] Allow sorting arrays as an aggregation operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-42784</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here&apos;s the use case.&lt;br/&gt;
I need a sorted array of elements within a document:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;   { $addFields : { &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;sortedArr&quot;&lt;/span&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; : { $sort :&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$anArray&quot;&lt;/span&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; } } }, &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;//something like this&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;Now, I could sort before the grouping, but that&apos;ll only work if the data set is small. If I have a much smalled subset of the data, sorting it would be much faster.&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="891971">SERVER-42784</key>
            <summary>Allow sorting arrays as an aggregation operation</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="3">Duplicate</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="zhadow.of.light@gmail.com">Gabriel Belmonte</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Aug 2019 21:14:30 +0000</created>
                <updated>Thu, 22 Aug 2019 17:20:03 +0000</updated>
                            <resolved>Mon, 19 Aug 2019 16:27:59 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2383030" author="zhadow.of.light@gmail.com" created="Thu, 22 Aug 2019 17:19:51 +0000"  >&lt;p&gt;the example is vastly oversimplified (as examples are), in reality the field by which i need to sort is a result of a projection and a bit of manipulation, so the index might not work as well.&lt;/p&gt;</comment>
                            <comment id="2377711" author="asya" created="Mon, 19 Aug 2019 18:51:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=zhadow.of.light%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;zhadow.of.light@gmail.com&quot;&gt;zhadow.of.light@gmail.com&lt;/a&gt; I closed this ticket as there is already one tracking this improvement but I wanted to point out two things:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;if you have an index to support the sort before the $group stage then it shouldn&apos;t be slow at all, in fact it should make the pipeline faster overall&lt;/li&gt;
	&lt;li&gt;you can currently do the sort of an array yourself using existing aggregation expressions, an example of that is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29425?focusedCommentId=2377709&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2377709&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;in this comment&#160;&lt;/a&gt;&lt;/li&gt;
&lt;/ol&gt;
</comment>
                            <comment id="2377416" author="asya" created="Mon, 19 Aug 2019 16:27:59 +0000"  >&lt;p&gt;This looks like a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29425&quot; title=&quot;Add an expression to sort an array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29425&quot;&gt;&lt;del&gt;SERVER-29425&lt;/del&gt;&lt;/a&gt; - closing.&lt;/p&gt;</comment>
                            <comment id="2375715" author="thomas.schubert" created="Fri, 16 Aug 2019 19:57:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=zhadow.of.light%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;zhadow.of.light@gmail.com&quot;&gt;zhadow.of.light@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the feature suggestion. I&apos;ve marked this ticket for consideration by our Query Team. Please continue to watch it for updates.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
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