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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-6084] Map/Reduce, emit() should not allow undefined as key</title>
                <link>https://jira.mongodb.org/browse/SERVER-6084</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The map function allows emit() to emit an undefined value for the key.  &lt;/p&gt;

&lt;p&gt;When many such emits occur, the reduce step will fail complaining that the value is too large to reduce.&lt;/p&gt;

&lt;p&gt;I can&apos;t see a situation where I would ever want to allow a key to be undefined, so I would like emit to throw an exception on the emit().  If changing the default behavior is undesirable, some sort of &apos;strict&apos; flag that enforced this would be nice.&lt;/p&gt;

&lt;p&gt;Personally, I ran into this because I ran a new M/R against an old collection.  I don&apos;t see it as a big deal for production systems, but at least the option to fail fast might speed up the development cycle.&lt;/p&gt;</description>
                <environment>OSX (not sure if that&amp;#39;s relevant)</environment>
        <key id="41181">SERVER-6084</key>
            <summary>Map/Reduce, emit() should not allow undefined as key</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="9">Done</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="andydavis">Andy Davis</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Wed, 13 Jun 2012 18:53:06 +0000</created>
                <updated>Tue, 6 Dec 2022 05:32:26 +0000</updated>
                            <resolved>Fri, 4 Feb 2022 15:09:49 +0000</resolved>
                                    <version>2.0.6</version>
                                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4335973" author="esha.bhargava" created="Fri, 4 Feb 2022 15:07:51 +0000"  >&lt;p&gt;Closing these tickets as part of the deprecation of mapReduce.&lt;/p&gt;</comment>
                            <comment id="2374956" author="david.storch" created="Fri, 16 Aug 2019 14:17:09 +0000"  >&lt;p&gt;It appears that in the master branch, &lt;tt&gt;emit()&lt;/tt&gt; is still allowed to produce &lt;tt&gt;undefined&lt;/tt&gt; as a key. However, we end up storing an &lt;tt&gt;_id&lt;/tt&gt; of &lt;tt&gt;null&lt;/tt&gt; rather than &lt;tt&gt;undefined&lt;/tt&gt; in the resulting output collection.&lt;/p&gt;</comment>
                            <comment id="140697" author="antoine" created="Mon, 9 Jul 2012 00:35:49 +0000"  >&lt;p&gt;we cannot change the default existing behavior since it could break some systems.&lt;br/&gt;
This can be done by adding a manual test in javascript for now.&lt;br/&gt;
We can evaluate to add another flag.&lt;/p&gt;</comment>
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