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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-83269] Deprecate system.js</title>
                <link>https://jira.mongodb.org/browse/SERVER-83269</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB allows customers to &lt;a href=&quot;https://www.mongodb.com/docs/manual/tutorial/store-javascript-function-on-server/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;store javascript functions&lt;/a&gt; on the server in a system collection called system.js.&lt;/p&gt;

&lt;p&gt;The functions customer stored within the system.js collection could be used within aggregations and queries such as mapReduce and $where respectively.&#160;&lt;/p&gt;

&lt;p&gt;Starting in MongoDB 5.0 mapReduce is deprecated in favor of an aggregation pipeline and for $where alternatives such as $expr are preferred due to better performance.&lt;/p&gt;

&lt;p&gt;System.js should be deprecated as the native built-in capabilities of the aggregation framework have increased and $function exists if custom expressions are needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2500682">SERVER-83269</key>
            <summary>Deprecate system.js</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="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="matt.panton@mongodb.com">Matt Panton</assignee>
                                    <reporter username="matt.panton@mongodb.com">Matt Panton</reporter>
                        <labels>
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                <created>Wed, 15 Nov 2023 13:14:09 +0000</created>
                <updated>Thu, 16 Nov 2023 12:32:44 +0000</updated>
                                            <version>7.1.0</version>
                                                                        <votes>0</votes>
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