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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-13551] Shell improperly deletes objects</title>
                <link>https://jira.mongodb.org/browse/SERVER-13551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongo shell deletes objects using &lt;tt&gt;delete&lt;/tt&gt; rather then just delete the reference.&lt;/p&gt;</description>
                <environment></environment>
        <key id="130491">SERVER-13551</key>
            <summary>Shell improperly deletes objects</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
                    </labels>
                <created>Thu, 10 Apr 2014 19:31:34 +0000</created>
                <updated>Fri, 11 Apr 2014 05:21:33 +0000</updated>
                            <resolved>Thu, 10 Apr 2014 21:14:39 +0000</resolved>
                                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="544345" author="kamran.khan" created="Thu, 10 Apr 2014 20:54:57 +0000"  >&lt;p&gt;This looks like a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13354&quot; title=&quot;delete operator in db.collection.find().forEach() sometimes behaves incorrectly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13354&quot;&gt;&lt;del&gt;SERVER-13354&lt;/del&gt;&lt;/a&gt;, which has an explanation for the behavior: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13354?focusedCommentId=528613&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-528613&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-13354?focusedCommentId=528613&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-528613&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;N = 1000&lt;/p&gt;

&lt;p&gt;// create data&lt;br/&gt;
db.coll.drop()&lt;br/&gt;
for (i = 0; i &amp;lt; N; i++) {&lt;br/&gt;
    newItem = &lt;/p&gt;
{&quot;a&quot;:1,&quot;b&quot;:2}
&lt;p&gt;;&lt;br/&gt;
    db.coll.insert(newItem);&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;// update&lt;br/&gt;
db.coll.find().forEach(function (obj) {&lt;br/&gt;
    obj.map = &lt;/p&gt;
{
        &quot;a&quot;:obj.a,
        &quot;b&quot;:obj.b
        }
&lt;p&gt;;&lt;br/&gt;
    delete obj.a;&lt;br/&gt;
    delete obj.b;&lt;br/&gt;
    db.coll.save(obj);&lt;br/&gt;
});&lt;br/&gt;
//&lt;/p&gt;

&lt;p&gt;// check&lt;br/&gt;
db.coll.aggregate( { $group :&lt;br/&gt;
                         { _id : &quot;$map.a&quot;,&lt;br/&gt;
                           totalA : &lt;/p&gt;
{ $sum : &quot;$map.b&quot; }
&lt;p&gt;                         }&lt;br/&gt;
                    });&lt;/p&gt;

&lt;p&gt;The output should be 2000, it is 1798 in 2.6.0 and 1800 in 2.4.10.&lt;/p&gt;</customfieldvalue>

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