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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-47338] Add an optional projection to a changestream query</title>
                <link>https://jira.mongodb.org/browse/SERVER-47338</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At the moment, the changestream definition only allows to specify the &lt;tt&gt;fullDocument&lt;/tt&gt; flag.&lt;/p&gt;

&lt;p&gt;For some use cases, it would be beneficial (to save network bandwidth) to specify the projection, so the client will receive the changes along with the few document&apos;s fields instead of receiving the multi-megabyte payload containing the whole document.&lt;/p&gt;

&lt;p&gt;The use case is that in a typical UPDATE scenario, teams only need a few &quot;read-only&quot; fields in addition to the delta to help identify a change that needs to be made in a downstream system. &lt;/p&gt;

&lt;p&gt;However, in some cases, documents can get pretty large because they grow over time (multi-MB is not out of the question). Having to read in a full multi-MB document when all you need is &amp;lt;100 bytes is difficult, puts pressure on the network and memory for no benefit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1304019">SERVER-47338</key>
            <summary>Add an optional projection to a changestream query</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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-execution">Backlog - Query Execution</assignee>
                                    <reporter username="andrey.brindeyev@mongodb.com">Andrey Brindeyev</reporter>
                        <labels>
                            <label>qexec-team</label>
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                <created>Fri, 3 Apr 2020 22:08:25 +0000</created>
                <updated>Tue, 6 Dec 2022 02:30:39 +0000</updated>
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