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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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<item>
            <title>[DRIVERS-1238] Investigate changes in PM-282: Sharded $lookup</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1238</link>
                <project id="10980" key="DRIVERS">Drivers</project>
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&lt;p&gt;    TBD once we are further with scoping.&lt;/p&gt;
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;This project will allow $lookup or $graphLookup to execute when the &apos;from&apos; namespace is sharded and add the ability to retrieve results from a different database.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;The $lookup stage is one of relatively few things that work on an unsharded collection but not on a sharded one. The fact that the &apos;from&apos; collection cannot be sharded surprises many users and prevents its use in many sharded deployments. We think that supporting this stage is worth doing to remove the element of surprise, even if the performance is suboptimal. Removing the restriction will also aid in capturing more customer use cases.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;https://goo.gl/yw549j&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://goo.gl/5kYbzY&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Design document&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="1341076">DRIVERS-1238</key>
            <summary>Investigate changes in PM-282: Sharded $lookup</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 May 2020 20:22:40 +0000</created>
                <updated>Fri, 27 May 2022 01:28:09 +0000</updated>
                            <resolved>Thu, 7 May 2020 14:46:41 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3073935" author="esha.bhargava" created="Thu, 7 May 2020 14:46:41 +0000"  >&lt;p&gt;No Drivers changes needed.&lt;/p&gt;</comment>
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