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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-11447] aggregation can sort using index to speed up group of an indexed field</title>
                <link>https://jira.mongodb.org/browse/SERVER-11447</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If &lt;tt&gt;&quot;$group&quot;&lt;/tt&gt; is grouping on an indexed field F and if all the functions are not dependent on the rest of the document (such as $sum:1 aka count) huge improvement can be made in performance by adding &lt;tt&gt;&apos;{$sort:{F:1&lt;/tt&gt;&apos;}} before the &lt;tt&gt;&apos;{$group}&apos;&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Tested on large collection (TPCH orders denormalized with lineitems inside) about 1.5 million documents aggregating by order date (2600 different dates) all after warming the data first:&lt;/p&gt;

&lt;p&gt;Without sort:  18-19 seconds&lt;br/&gt;
With sort:   2.5-2.6 seconds&lt;/p&gt;

&lt;p&gt;On really small datasets I still see at least 25%-33% improvement with $sort so if we can do that &quot;automatically&quot; that would help performance.&lt;/p&gt;</description>
                <environment></environment>
        <key id="96234">SERVER-11447</key>
            <summary>aggregation can sort using index to speed up group of an indexed field</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Oct 2013 18:20:12 +0000</created>
                <updated>Sun, 12 Mar 2017 22:18:29 +0000</updated>
                            <resolved>Wed, 8 Apr 2015 21:19:32 +0000</resolved>
                                    <version>2.4.7</version>
                    <version>2.5.3</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>6</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="805874" author="daldoyle" created="Thu, 15 Jan 2015 22:14:37 +0000"  >&lt;p&gt;This is a very important issue for our use case as well. We currently do an aggregate to determine a total number of possible unique results and this issue accounts for most of the runtime of any data fetch. &lt;/p&gt;</comment>
                            <comment id="796540" author="sylvinus" created="Sat, 3 Jan 2015 23:44:16 +0000"  >&lt;p&gt;Any news on this issue? Thanks!&lt;/p&gt;</comment>
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