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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>[COMPASS-5636] Aggregate $project not working after $lookup</title>
                <link>https://jira.mongodb.org/browse/COMPASS-5636</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>&lt;h3&gt;&lt;a name=&quot;ProblemStatement%2FRationale&quot;&gt;&lt;/a&gt;&lt;b&gt;Problem Statement/Rationale&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;On an Aggregate, I have a simple $lookup that pulls an array of object, on the next pipeline I use a $project with a syntax that works perfectly fine with $set or $addField, so I&apos;m not sure what&apos;s going on.&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;I also launched the aggregate on the shell to see if it comes from Compass, but it also gives me an empty result.&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/368677/368677_Screenshot+2022-03-26+115416.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/font&gt;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;StepstoReproduce&quot;&gt;&lt;/a&gt;&lt;b&gt;Steps to Reproduce&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;It works perfectly fine on other collections, so I&apos;m not sure I can reproduce it.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;ExpectedResults&quot;&gt;&lt;/a&gt;&lt;b&gt;Expected Results&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;The same result as I get on $set pipeline&lt;/font&gt;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;ActualResults&quot;&gt;&lt;/a&gt;&lt;b&gt;Actual Results&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;Not the same result as I get on $set pipeline&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;AdditionalNotes&quot;&gt;&lt;/a&gt;&lt;b&gt;Additional Notes&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;&lt;font color=&quot;#505f79&quot;&gt;I use&#160;MongoDB 5.0.6 Enterprise&lt;/font&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2009626">COMPASS-5636</key>
            <summary>Aggregate $project not working after $lookup</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="shadowbob45@gmail.com">Shadoweb EB</reporter>
                        <labels>
                    </labels>
                <created>Sat, 26 Mar 2022 12:01:27 +0000</created>
                <updated>Fri, 27 Oct 2023 13:07:37 +0000</updated>
                            <resolved>Tue, 29 Mar 2022 04:36:37 +0000</resolved>
                                    <version>1.30.1</version>
                                    <fixVersion>No version</fixVersion>
                                    <component>Aggregation pipeline</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4440650" author="rhys.howell" created="Tue, 29 Mar 2022 04:36:37 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shadowbob45%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;shadowbob45@gmail.com&quot;&gt;shadowbob45@gmail.com&lt;/a&gt; - thanks for reporting the issue. From the description, since this is not something Compass dependent (also happens in shell) I&apos;m going to close this ticket as works as designed if that&apos;s alright.&lt;/p&gt;

&lt;p&gt;This question might be better for general support portal: &lt;a href=&quot;https://support.mongodb.com/welcome&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://support.mongodb.com/welcome&lt;/a&gt;&lt;br/&gt;
Or the forums might be a good place to find some help: &lt;a href=&quot;https://www.mongodb.com/community/forums/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/community/forums/&lt;/a&gt;&lt;br/&gt;
If possible posting a minimal example case, so something with a few sample documents and the pipeline would help. Sometimes I find that in building a minimal reproduction I&apos;ll find where in my code things aren&apos;t happening as expected, or a bug is found!&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="368677" name="Screenshot 2022-03-26 115416.png" size="218655" author="shadowbob45@gmail.com" created="Sat, 26 Mar 2022 11:54:30 +0000"/>
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