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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-34613] aggregation pipeline operators for array iterations like permutations and k combinations</title>
                <link>https://jira.mongodb.org/browse/SERVER-34613</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently no operations allow for combinations or permutations of grouped fields within the aggregation pipeline. MapReduce currently doesn&apos;t support multiple values returned as part of &quot;reduce&quot;, so it&apos;s not an option at this point. However, it would best to have this implemented as part of the aggregation pipeline so that other operations can be chained like sorting.&lt;/p&gt;</description>
                <environment></environment>
        <key id="532537">SERVER-34613</key>
            <summary>aggregation pipeline operators for array iterations like permutations and k combinations</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="4">Incomplete</resolution>
                                        <assignee username="william.byrne@mongodb.com">William Byrne III</assignee>
                                    <reporter username="swatford">Sean Watford</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Apr 2018 14:38:41 +0000</created>
                <updated>Tue, 4 Sep 2018 03:03:04 +0000</updated>
                            <resolved>Mon, 30 Jul 2018 20:33:12 +0000</resolved>
                                    <version>3.6.4</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1960750" author="asya" created="Mon, 30 Jul 2018 20:33:12 +0000"  >&lt;p&gt;Closing as it&apos;s not clear what exactly would satisfy this feature request.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=swatford&quot; class=&quot;user-hover&quot; rel=&quot;swatford&quot;&gt;swatford&lt;/a&gt; please re-open if you can provide more details, preferably with an example of input documents and result documents that are desired.&lt;/p&gt;</comment>
                            <comment id="1920439" author="william.byrne" created="Thu, 14 Jun 2018 08:40:13 +0000"  >&lt;p&gt;Hi Sean,&lt;/p&gt;

&lt;p&gt;I am familiar with the basic mathematical uses of the terms &lt;em&gt;k-combinations&lt;/em&gt; and &lt;em&gt;permutations&lt;/em&gt; (as detailed in this &lt;a href=&quot;https://en.wikipedia.org/wiki/Combination&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;wikipedia article&lt;/a&gt;) - both are selections of items from a set, but with permutations the order selected is significant.  Using existing MongoDB operators you can generate permutations of a set of array members, but I am not clear on what you mean by &quot;combinations or permutations of grouped fields&quot;.&lt;/p&gt;

&lt;p&gt;Please clarify exactly what it is you are seeking to have these proposed new operators do.  If you could provide  sample input documents and what the outputs should look like then we will be better able to investigate this further for you.&lt;/p&gt;

&lt;p&gt;Regards,&lt;/p&gt;

&lt;p&gt;William Byrne III   &lt;/p&gt;


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