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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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            <title>[SERVER-26294] flag nodes seen more than once in $graphLookup traversal</title>
                <link>https://jira.mongodb.org/browse/SERVER-26294</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When traversing a graph with $graphLookup, we suppress duplicates (in cases of cycles).   It would be useful to have an option to include a flag indicating a node that caused the traversal to stop due to duplication.&lt;/p&gt;</description>
                <environment></environment>
        <key id="318517">SERVER-26294</key>
            <summary>flag nodes seen more than once in $graphLookup traversal</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="asya.kamsky@mongodb.com">Asya Kamsky</reporter>
                        <labels>
                            <label>graph</label>
                    </labels>
                <created>Fri, 23 Sep 2016 18:07:24 +0000</created>
                <updated>Mon, 15 Jan 2024 22:08:34 +0000</updated>
                                                                            <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="6005538" author="david@vendop.com" created="Thu, 11 Jan 2024 21:32:27 +0000"  >&lt;p&gt;Following up on this as I have the requirement for additional pipelines after $graphLookup where there are duplicates / repeated nodes in the traversal.&lt;/p&gt;

&lt;p&gt;The additional pipelines will do mathematical calculations on quantities for manufacturing purposes. The calculations can&apos;t be performed in MongoDB if repeated nodes are stripped from the $graphLookup output.&lt;/p&gt;

&lt;p&gt;This was also requested @ &lt;a href=&quot;https://feedback.mongodb.com/forums/924280-database/suggestions/47641904-include-or-flag-nodes-seen-more-than-once-duplic&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://feedback.mongodb.com/forums/924280-database/suggestions/47641904-include-or-flag-nodes-seen-more-than-once-duplic&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5941854" author="david@vendop.com" created="Mon, 11 Dec 2023 20:11:37 +0000"  >&lt;p&gt;+1 this would be super helpful. I&apos;m doing this manually by iterating the graph and adding the nodes back in. In my case, the nodes show up at different levels, so I have to compute the depth as well.&lt;/p&gt;</comment>
                            <comment id="2584114" author="crunk1@gmail.com" created="Wed, 4 Dec 2019 21:06:58 +0000"  >&lt;p&gt;Not traversing already-visited nodes would allow for full graph traversal. This would be super helpful.&lt;/p&gt;</comment>
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