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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-25051] $lookup should support an &quot;restrictWithMatch&quot; option</title>
                <link>https://jira.mongodb.org/browse/SERVER-25051</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In many use cases, a user will want to restrict the documents $lookup searches via some additional parameter. For example, they may want:&lt;/p&gt;

&lt;p/&gt;
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						&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;   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;  $lookup: {&lt;/span&gt;&lt;/pre&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;    from: &apos;employees&apos;,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;But, they may only want to look for employees that have &quot;active: true&quot;. Currently, they can do this in two ways:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Follow the $lookup with a $unwind on &apos;manages&apos;, and then a $match.&lt;/li&gt;
	&lt;li&gt;Follow the $lookup with a $project and a $filter on &apos;manages&apos;.&lt;br/&gt;
We will optimize the former case (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21612&quot; title=&quot;Combine post $lookup $match on looked up field&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21612&quot;&gt;&lt;del&gt;SERVER-21612&lt;/del&gt;&lt;/a&gt;) and execute the $match as a query on the foreign collection, but this is not immediately clear from the pipeline.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Another option is, in 3.4, the user could use $graphLookup with a &apos;maxDepth&apos; of 0 and a &apos;restrictSearchWithMatch&apos; parameter to achieve the same effect--a poor workaround.&lt;/p&gt;

&lt;p&gt;As such, $lookup should allow the user to specify an additional option, &apos;restrictWithMatch&apos;, that is a $match-type filter that is applied to any document from the foreign collection to be returned.&lt;/p&gt;

&lt;p&gt;Other features available for $graphLookup that are missing for $lookup:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;localField is a field path only, startWith is an arbitrary expression.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="300937">SERVER-25051</key>
            <summary>$lookup should support an &quot;restrictWithMatch&quot; option</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="benjamin.murphy">Benjamin Murphy</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Jul 2016 21:58:03 +0000</created>
                <updated>Tue, 6 Dec 2022 04:21:39 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>2</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2254484" author="david.storch" created="Tue, 21 May 2019 17:25:07 +0000"  >&lt;p&gt;I think we intended to flag this ticket for triage after getting input from Asya, but never did. I&apos;m doing that now.&lt;/p&gt;</comment>
                            <comment id="2185843" author="asya" created="Wed, 20 Mar 2019 03:06:33 +0000"  >&lt;p&gt;Consider for quick win nomination&lt;/p&gt;</comment>
                            <comment id="1513159" author="skanagavelu" created="Wed, 1 Mar 2017 12:53:36 +0000"  >&lt;p&gt;This will save memory and process time in case of time bucketed analytics, where time range in one collection and match criteria is on another collection. &lt;a href=&quot;http://stackoverflow.com/questions/42516573/mongodb-join-or-lookup-via-nested-sub-document-field&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://stackoverflow.com/questions/42516573/mongodb-join-or-lookup-via-nested-sub-document-field&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1502531" author="asya" created="Fri, 17 Feb 2017 20:19:31 +0000"  >&lt;blockquote&gt;&lt;p&gt;Follow the $lookup with a $unwind on &apos;manages&apos;, and then a $match.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The problem is that this &lt;b&gt;cannot&lt;/b&gt; be used when preserveNullAndEmptyArrays is set to true, and therefore causes a major performance issue.&lt;/p&gt;
</comment>
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