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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2199] mapReduce command doesn&apos;t tolerate null finalize attribute</title>
                <link>https://jira.mongodb.org/browse/SERVER-2199</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that MR chokes if passed a null finalize function:&lt;/p&gt;

&lt;p&gt;&amp;gt; res = db.items.mapReduce(m, r);                    &lt;br/&gt;
{&lt;br/&gt;
	&quot;result&quot; : &quot;tmp.mr.mapreduce_1291928405_106&quot;,&lt;br/&gt;
	&quot;timeMillis&quot; : 3,&lt;br/&gt;
	&quot;counts&quot; : &lt;/p&gt;
{
		&quot;input&quot; : 10,
		&quot;emit&quot; : 10,
		&quot;output&quot; : 8
	}
&lt;p&gt;,&lt;br/&gt;
	&quot;ok&quot; : 1,&lt;br/&gt;
}&lt;br/&gt;
&amp;gt; res = db.items.mapReduce(m, r, &lt;/p&gt;
{ finalize: null }
&lt;p&gt;);&lt;br/&gt;
Thu Dec  9 13:00:14 uncaught exception: map reduce failed: {&lt;br/&gt;
	&quot;assertion&quot; : &quot;not code&quot;,&lt;br/&gt;
	&quot;assertionCode&quot; : 10062,&lt;br/&gt;
	&quot;errmsg&quot; : &quot;db assertion failure&quot;,&lt;br/&gt;
	&quot;ok&quot; : 0&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;The log indicates &quot;can&apos;t convert type: 10 to code&quot;, which I take to mean MongoDB tried to treat the finalize attribute as code without first checking that it&apos;s null.&lt;/p&gt;

&lt;p&gt;Note that this is &lt;b&gt;not&lt;/b&gt; the behavior of the query attribute:&lt;/p&gt;

&lt;p&gt;&amp;gt; res = db.items.mapReduce(m, r, &lt;/p&gt;
{ query: null }
&lt;p&gt;);                               &lt;br/&gt;
{&lt;br/&gt;
	&quot;result&quot; : &quot;tmp.mr.mapreduce_1291928582_108&quot;,&lt;br/&gt;
	&quot;timeMillis&quot; : 33,&lt;br/&gt;
	&quot;counts&quot; : &lt;/p&gt;
{
		&quot;input&quot; : 10,
		&quot;emit&quot; : 10,
		&quot;output&quot; : 8
	}
&lt;p&gt;,&lt;br/&gt;
	&quot;ok&quot; : 1,&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;Besides simple consistency (and the lack of a more specific error message), it would be nice for MR to be null-safe in finalize because I have some utility code that handles cases both with and without a finalize attribute, and the easy thing is just to pass null as the finalize attribute in cases without it. (I can give illustrative Python code if needed.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="13917">SERVER-2199</key>
            <summary>mapReduce command doesn&apos;t tolerate null finalize attribute</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="jyrinx">Luke Maurer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Dec 2010 21:40:21 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:27 +0000</updated>
                            <resolved>Sun, 16 Jan 2011 05:51:33 +0000</resolved>
                                    <version>1.6.4</version>
                                    <fixVersion>1.7.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="22397" author="auto" created="Sun, 16 Jan 2011 05:52:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: handle null finalize in m/r &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2199&quot; title=&quot;mapReduce command doesn&amp;#39;t tolerate null finalize attribute&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2199&quot;&gt;&lt;del&gt;SERVER-2199&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/418423388cdfbbb6fd6070b418862f56e9b72179&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/418423388cdfbbb6fd6070b418862f56e9b72179&lt;/a&gt;&lt;/p&gt;</comment>
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