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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>[SERVER-27915] Make $group with $addToSet accumulator use DISTINCT_SCAN when applicable</title>
                <link>https://jira.mongodb.org/browse/SERVER-27915</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="351626">SERVER-27915</key>
            <summary>Make $group with $addToSet accumulator use DISTINCT_SCAN when applicable</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>QFB</label>
                            <label>asya</label>
                            <label>tpcc</label>
                    </labels>
                <created>Fri, 3 Feb 2017 22:20:22 +0000</created>
                <updated>Tue, 6 Dec 2022 04:06:55 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                    <component>Querying</component>
                                        <votes>3</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="4496726" author="JIRAUSER1257467" created="Thu, 21 Apr 2022 12:19:33 +0000"  >&lt;p&gt;Yes, that is the case, this SERVER ticket was closed when PM-941 was closed&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin@mongodb.com&quot;&gt;james.wahlin@mongodb.com&lt;/a&gt; I tagged you on the meeting notes where that decision was made&lt;/p&gt;

&lt;p&gt;Do you want to push this SERVER ticket to &quot;Needs Triage&quot; or Leave it on the Backlog?&lt;/p&gt;</comment>
                            <comment id="4462458" author="asya" created="Wed, 6 Apr 2022 19:39:54 +0000"  >&lt;p&gt;reopening for re-triage (or to get a comment as to why it was closed)&lt;/p&gt;</comment>
                            <comment id="2039173" author="david.storch" created="Tue, 23 Oct 2018 15:25:14 +0000"  >&lt;p&gt;$group with $first (or with no accumulators) using DISTINCT_SCAN was implemented in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9507&quot; title=&quot;Optimize $sort+$group+$first pipeline to avoid full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9507&quot;&gt;&lt;del&gt;SERVER-9507&lt;/del&gt;&lt;/a&gt;. $group with $last using DISTINCT_SCAN is now tracked by related ticket&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37304&quot; title=&quot;Extend $sort+$group+$first pipeline optimization to $last&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37304&quot;&gt;&lt;del&gt;SERVER-37304&lt;/del&gt;&lt;/a&gt;. Therefore, I&apos;m narrowing the scope of this ticket to be specifically about the $addToSet case that &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; mentions above.&lt;/p&gt;</comment>
                            <comment id="2027350" author="asya" created="Tue, 9 Oct 2018 03:31:15 +0000"  >&lt;p&gt;Ways of getting distinct values of &quot;field&quot; in aggregation:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$group:{_id:&quot;$field&quot;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$group:{_id:null, f:{$addToSet:&quot;$field&quot;}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="1898613" author="david.storch" created="Tue, 22 May 2018 18:10:33 +0000"  >&lt;p&gt;I would say that this is a superset of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9507&quot; title=&quot;Optimize $sort+$group+$first pipeline to avoid full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9507&quot;&gt;&lt;del&gt;SERVER-9507&lt;/del&gt;&lt;/a&gt;. There are multiple ways to express distinct-like queries in aggregation:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;$group with the $addToSet accumulator.&lt;/li&gt;
	&lt;li&gt;$sort followed by $group with a $first/$last accumulator.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9507&quot; title=&quot;Optimize $sort+$group+$first pipeline to avoid full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9507&quot;&gt;&lt;del&gt;SERVER-9507&lt;/del&gt;&lt;/a&gt; specifically covers #2, whereas this ticket covers both scenarios. Once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9507&quot; title=&quot;Optimize $sort+$group+$first pipeline to avoid full index scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9507&quot;&gt;&lt;del&gt;SERVER-9507&lt;/del&gt;&lt;/a&gt; is implemented, the scope if this ticket should be narrowed.&lt;/p&gt;</comment>
                            <comment id="1897285" author="ian@10gen.com" created="Mon, 21 May 2018 17:24:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; to consider whether this is a dupe/related to the Stitch work around sort/group first.&lt;/p&gt;</comment>
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            <issuekey id="313141">SERVER-25899</issuekey>
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