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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3136] A MapReduce with out = {reduce: &quot;coll&quot;} should not have a finalize function since its output type does not match the reduce&apos;s input type</title>
                <link>https://jira.mongodb.org/browse/SERVER-3136</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &apos;out&apos; option for mapreduce command can be given the &apos;reduce&apos; option, which according to the wiki documentation:&lt;br/&gt;
&quot;&lt;/p&gt;
{ reduce : &apos;collectionName&apos; }
&lt;p&gt; - If documents exists for a given key in the result set and in the old collection, then a reduce operation (using the specified reduce function) will be performed on the two values and the result will be written to the output collection. If a finalize function was provided, this will be run after the reduce as well.&quot;&lt;/p&gt;

&lt;p&gt;The problem is the reduce function has type &quot;&lt;span class=&quot;error&quot;&gt;&amp;#91;a&amp;#93;&lt;/span&gt; -&amp;gt; a&quot; but the finalize function has type &quot;a -&amp;gt; b&quot;. If you run the same mapreduce that has a finalize function more than once with out = &lt;/p&gt;
{reduce: &quot;coll&quot;}
&lt;p&gt;, the previous result will have a value of type &quot;b&quot; but the next mapreduce will try to reduce it expecting a value of type &quot;a&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="17460">SERVER-3136</key>
            <summary>A MapReduce with out = {reduce: &quot;coll&quot;} should not have a finalize function since its output type does not match the reduce&apos;s input type</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="tonyh">Tony Hannan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 May 2011 20:43:11 +0000</created>
                <updated>Mon, 29 Aug 2011 15:56:31 +0000</updated>
                            <resolved>Wed, 25 May 2011 06:09:56 +0000</resolved>
                                    <version>1.7.4</version>
                                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="34299" author="eliot" created="Wed, 25 May 2011 06:09:56 +0000"  >&lt;p&gt;There area  number of use cases where this is desired.&lt;br/&gt;
For example merging data for 2 collections.&lt;/p&gt;</comment>
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