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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-2688] temporary collection created by mapReduce returned Double instead of Int</title>
                <link>https://jira.mongodb.org/browse/SERVER-2688</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Not sure whether it is a bug, so just fire a question.&lt;/p&gt;

&lt;p&gt;I have following map/reduce functions defined:&lt;/p&gt;

&lt;p&gt;m = function() &lt;/p&gt;
{ emit(&quot;totalClickCount&quot;, this.clickCount); }
&lt;p&gt;r = function(key, values) &lt;/p&gt;
{ return Array.sum(values); }

&lt;p&gt;If I run everything in mongodb console, I can get result as I expected: &lt;/p&gt;
{ &quot;_id&quot; : &quot;totalClickCount&quot;, &quot;value&quot; : 2 }
&lt;p&gt;, here value is an integer; but if I use mongodb-java-driver to do exactly the same thing, it returns double instead of integer for &quot;value&quot;. Also, I tried to query the temporary collection directly in mongodb console, and it is integer as well.&lt;/p&gt;

&lt;p&gt;I tried to debug, and saw that for returned BSON stream, data type was &quot;NUMBER&quot; which means a floating point according to BSON&apos;s spec, so seems that mongodb-java-driver is correct. But why does server return a double type?&lt;/p&gt;</description>
                <environment>Mac OS X 64bit, mongoDB-1.6.5 64bit, mongodb-java-driver-2.4</environment>
        <key id="15009">SERVER-2688</key>
            <summary>temporary collection created by mapReduce returned Double instead of Int</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="honnix">Honnix Liang</reporter>
                        <labels>
                    </labels>
                <created>Sun, 6 Mar 2011 10:58:37 +0000</created>
                <updated>Mon, 29 Aug 2011 15:56:49 +0000</updated>
                            <resolved>Sun, 6 Mar 2011 16:07:38 +0000</resolved>
                                    <version>1.6.5</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="25394" author="honnix" created="Mon, 7 Mar 2011 13:24:03 +0000"  >&lt;p&gt;Well, then I got it. I&apos;m totally a newbie on javascript...&lt;/p&gt;</comment>
                            <comment id="25387" author="eliot" created="Mon, 7 Mar 2011 13:08:16 +0000"  >&lt;p&gt;Yes, javascript will display doubles that fall on whole numbers as integers&lt;/p&gt;</comment>
                            <comment id="25386" author="honnix" created="Mon, 7 Mar 2011 12:27:21 +0000"  >&lt;p&gt;but for me, it is just the opposite, in shell, I got something like integer, while via API, it is double.&lt;/p&gt;

&lt;p&gt;so do you mean that even in shell, I also got an double, while it displayed like an integer instead?&lt;/p&gt;</comment>
                            <comment id="25361" author="scotthernandez" created="Sun, 6 Mar 2011 16:07:38 +0000"  >&lt;p&gt;In javascript the default number type is a double. If you want to return an integer then you must create a special object to represent it; at the moment there is only support for a 64bit integer (long) in javascript with the NumberLong class.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/mongo+-+The+Interactive+Shell#mongo-TheInteractiveShell-Numbers&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/mongo+-+The+Interactive+Shell#mongo-TheInteractiveShell-Numbers&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;You can vote on this for better 32bit int support in javascript: &lt;a href=&quot;http://jira.mongodb.org/browse/SERVER-854&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;http://jira.mongodb.org/browse/SERVER-854&lt;/a&gt;&lt;/p&gt;</comment>
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