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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2292] Can&apos;t group when the count of data more than 20000</title>
                <link>https://jira.mongodb.org/browse/SERVER-2292</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a collection contains 821463 document in mongodb,I want to group the document by a key named MacId.My command is below:&lt;/p&gt;</description>
                <environment>OS:Win2003 x64 Enterprise&lt;br/&gt;
FileSystem:NTFS&lt;br/&gt;
MongoVersion:1.7.4</environment>
        <key id="14089">SERVER-2292</key>
            <summary>Can&apos;t group when the count of data more than 20000</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="-1">Unassigned</assignee>
                                    <reporter username="xuqing">xuqing</reporter>
                        <labels>
                    </labels>
                <created>Tue, 28 Dec 2010 02:10:04 +0000</created>
                <updated>Tue, 28 Dec 2010 02:37:37 +0000</updated>
                            <resolved>Tue, 28 Dec 2010 02:37:37 +0000</resolved>
                                    <version>1.7.4</version>
                                                    <component>Querying</component>
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                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="21837" author="eliot" created="Tue, 28 Dec 2010 02:37:37 +0000"  >&lt;p&gt;This is a limitation of group that will not be changed.&lt;/p&gt;

&lt;p&gt;Currently you can use map/reduce as an alternative.&lt;/p&gt;

&lt;p&gt;In the future, this will be available:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-447&quot; title=&quot;new aggregation framework&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-447&quot;&gt;&lt;del&gt;SERVER-447&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21835" author="xuqing" created="Tue, 28 Dec 2010 02:15:03 +0000"  >&lt;p&gt;My command is below:&lt;br/&gt;
db.tMac.group(&lt;br/&gt;
           {key: &lt;/p&gt;
{ MacId:true }
&lt;p&gt;,&lt;br/&gt;
            cond: { },&lt;br/&gt;
            reduce: function(obj,prev) &lt;/p&gt;
{ prev.csum ++; }
&lt;p&gt;,&lt;br/&gt;
            initial: &lt;/p&gt;
{ csum: 0 }
&lt;p&gt;            });&lt;/p&gt;</comment>
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