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        <build-date>13-04-2023</build-date>
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<item>
            <title>[DRIVERS-758] Support for JavaScript User Defined Functions</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-758</link>
                <project id="10980" key="DRIVERS">Drivers</project>
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Allow users to specify JavaScript user-defined functions (expressions) and accumulators in Agg pipelines. This functionality was delivered as part of &#8220;MapReduce in Agg&#8221; (PM-776) and will be exposed through this project.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;We want to empower users to write custom expressions in order to implement behaviors not supported by MQL. This will bring us closer to parity with many databases, in particular DocumentDB, that support UDFs in JS and several other languages. It was also a critical feature for ETL pipelines in Tableau Prep.&lt;/p&gt;

&lt;p&gt;The most common use case is projecting computed columns and filtering, however, the concept can also be used to parameterize operations like sorting with a custom comparator or clustering with a distance function, as well as custom $group keys.&lt;br/&gt;
Last but not least, this effort is a prerequisite to deprecate the MR command (PM-1470).&lt;/p&gt;

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        <key id="974297">DRIVERS-758</key>
            <summary>Support for JavaScript User Defined Functions</summary>
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                                            <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>
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                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Mon, 21 Oct 2019 14:45:41 +0000</created>
                <updated>Sat, 28 Oct 2023 10:45:10 +0000</updated>
                            <resolved>Tue, 28 Apr 2020 18:14:34 +0000</resolved>
                                                                            <votes>1</votes>
                                    <watches>3</watches>
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