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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21621] Piped query</title>
                <link>https://jira.mongodb.org/browse/SERVER-21621</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be great if collection.find() can support piped query like aggregation. &lt;/p&gt;

&lt;p&gt;Let me explain this in a scenario below. &lt;/p&gt;

&lt;p&gt;In a customer support team, if a customer&apos;s issue has been handled by an engineer before, it&apos;s desired that the same engineer should handle new issue raised by this customer. &lt;/p&gt;

&lt;p&gt;Currently, to achieve this, I&apos;d have to do two queries: &lt;br/&gt;
1. For a given engineer&apos;s ID, find customers he has supported before. &lt;br/&gt;
2. Find new issues raised by customers found in query 1. &lt;/p&gt;

&lt;p&gt;This is technically possible but have drawbacks: &lt;br/&gt;
1. Two DB queries have to be done, instead of one. &lt;br/&gt;
2. Customer information isn&apos;t really required by application but it has to be transmitted over network back and forth. &lt;br/&gt;
3. If there&apos;re too many customers returned by query one, passing them back to MongoDB as parameter can potentially crash MongoDB. &lt;/p&gt;

&lt;p&gt;If a piped query is supported, then customer information can be produced and consumed within MongoDB internally. It should be more optimal in term of performance and client side coding. &lt;/p&gt;</description>
                <environment></environment>
        <key id="240637">SERVER-21621</key>
            <summary>Piped query</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="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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="xuguoming@nexlabs.com">Yang</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Nov 2015 03:35:51 +0000</created>
                <updated>Mon, 23 Nov 2015 13:00:18 +0000</updated>
                            <resolved>Mon, 23 Nov 2015 13:00:18 +0000</resolved>
                                    <version>3.0.7</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1095607" author="ramon.fernandez" created="Mon, 23 Nov 2015 12:59:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=xuguoming%40nexlabs.com&quot; class=&quot;user-hover&quot; rel=&quot;xuguoming@nexlabs.com&quot;&gt;xuguoming@nexlabs.com&lt;/a&gt;, please take a look at the &lt;a href=&quot;https://docs.mongodb.org/manual/release-notes/3.2-reference/#pipe._S_lookup&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;$lookup&lt;/tt&gt; operator&lt;/a&gt;, for I think it provides the functionality you&apos;re looking for.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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