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    <title>MongoDB Jira</title>
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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-31747] Allow projections inside lookup stages in aggregation pipelines</title>
                <link>https://jira.mongodb.org/browse/SERVER-31747</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Now when you have a lookup stage in your aggregation pipeline, that lookup retrieves all the complete documents from the foreign collection, this is risky because you can reach the maximum document size very easily if:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;The foreign collection is big enough&lt;/li&gt;
	&lt;li&gt;Each document is very heavy (our case)&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;It may be legit to increase the maximum document size limit when you need all the data from the foreign collection documents, but you will finally reach the limit at some point, and, for the second point, not always all the data holding from a document is needed, just a small portion of it, but, if you cannot make a projection from each document, discarding what you don&apos;t need, then the maximum document size will be reached as well at some point. In fact the limit could be always reached, but it is harder to reach that limit when you have a bunch of numbers, than having a bunch of other huge data.&lt;/p&gt;

&lt;p&gt;We think that the solution is to allow projections inside the lookup stage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="451882">SERVER-31747</key>
            <summary>Allow projections inside lookup stages in aggregation pipelines</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="jgl">Jose</reporter>
                        <labels>
                            <label>feature</label>
                    </labels>
                <created>Fri, 27 Oct 2017 13:32:01 +0000</created>
                <updated>Tue, 6 Dec 2022 03:48:05 +0000</updated>
                            <resolved>Fri, 27 Oct 2017 19:16:41 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1711516" author="james.wahlin@10gen.com" created="Fri, 27 Oct 2017 19:14:28 +0000"  >&lt;p&gt;Hi Jose,&lt;/p&gt;

&lt;p&gt;The feature you request will be available in MongoDB 3.6.0 and can be tested in our 3.6.0-rc1 release candidate. This comes as part of a new $lookup feature which allows users to specify a foreign pipeline. For details see the following docs page:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/master/reference/operator/aggregation/lookup/#join-conditions-and-uncorrelated-sub-queries&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/master/reference/operator/aggregation/lookup/#join-conditions-and-uncorrelated-sub-queries&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
James&lt;/p&gt;</comment>
                            <comment id="1711397" author="mark.agarunov" created="Fri, 27 Oct 2017 17:55:57 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jgl&quot; class=&quot;user-hover&quot; rel=&quot;jgl&quot;&gt;jgl&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the detailed description. I&apos;ve set the fixVersion to &quot;Needs Triage&quot; for this new feature to be scheduled against our currently planned work. Updates will be posted on this ticket as they happen.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
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            <issuekey id="380695">SERVER-29072</issuekey>
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