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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-34935] Support cross-database lookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-34935</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This will increase the expressiveness of the aggregation pipeline and allow new applications to be supported by MongoDB.&lt;/p&gt;

&lt;p&gt;Work should include banning $lookup stages that reference a foreign DB from non-materialized view definitions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="542180">SERVER-34935</key>
            <summary>Support cross-database lookup</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="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="adinoyi.omuya@mongodb.com">Adinoyi Omuya</reporter>
                        <labels>
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                <created>Thu, 10 May 2018 17:52:19 +0000</created>
                <updated>Tue, 6 Dec 2022 03:29:49 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>34</votes>
                                    <watches>40</watches>
                                                                                                                <comments>
                            <comment id="2389544" author="christian.kurze" created="Tue, 27 Aug 2019 17:12:20 +0000"  >&lt;p&gt;Is there a tentative date when this issue moves back into active development? &lt;/p&gt;

&lt;p&gt;I have a case here, where data across different stages is modified until usable for the use cases. It involves some $lookups and different databases would be great for easier managment of privileges (e.g. read to the whole refined data, but no access to underlying stages).&lt;/p&gt;</comment>
                            <comment id="2078515" author="charlie.swanson" created="Mon, 3 Dec 2018 16:20:37 +0000"  >&lt;p&gt;Unfortunately &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=devin.hilly&quot; class=&quot;user-hover&quot; rel=&quot;devin.hilly&quot;&gt;devin.hilly&lt;/a&gt; has rotated off the query team&#160;before we could get this fully working so I&apos;m moving this back onto the backlog user to be picked up in a later sprint.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;The linked code review has the details on what we did get working and what still needs to be done/investigated. Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=devin.hilly&quot; class=&quot;user-hover&quot; rel=&quot;devin.hilly&quot;&gt;devin.hilly&lt;/a&gt;!&lt;/p&gt;</comment>
                            <comment id="2064779" author="charlie.swanson" created="Fri, 16 Nov 2018 18:04:41 +0000"  >&lt;p&gt;Tentatively bringing this into the sprint and assigning to Devin. The scope here will probably have to be constrained to unsharded deployments to avoid breaking things, as a start.&lt;/p&gt;</comment>
                            <comment id="1889130" author="adinoyi.omuya@10gen.com" created="Fri, 11 May 2018 14:38:13 +0000"  >&lt;p&gt;Nope, thanks for the update.&lt;/p&gt;</comment>
                            <comment id="1889024" author="charlie.swanson" created="Fri, 11 May 2018 13:20:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=adinoyi.omuya&quot; class=&quot;user-hover&quot; rel=&quot;adinoyi.omuya&quot;&gt;adinoyi.omuya&lt;/a&gt; did you mean to assign this to yourself?&lt;/p&gt;</comment>
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