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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-6439] Duplicate fields at the same level should not be allowed</title>
                <link>https://jira.mongodb.org/browse/SERVER-6439</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Disallow writing new documents with duplicate field names at the same level, like: &lt;p/&gt;
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&lt;p/&gt;&lt;/p&gt;

&lt;p&gt;In previous versions of mongodb, updates could be written to produce duplicate fields, but can no longer be as of 2.6.&lt;/p&gt;

&lt;p&gt;For existing data, one should be able to replace the existing &quot;bad&quot; documents with &quot;fixed&quot; versions.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Note&lt;/b&gt;: Documents which already exist should still be replicated and migrated during system operations, but cannot be modified without &quot;fixing&quot; them.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Clients&lt;/b&gt;: Some client will error if they encounter duplicate field names in a document, like .net; in javascript and other languages one of the fields may be hidden or lost since the native storage is a map where keys (field names) are unique.&lt;/p&gt;</description>
                <environment></environment>
        <key id="44118">SERVER-6439</key>
            <summary>Duplicate fields at the same level should not be allowed</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>bson</label>
                            <label>platforms-re-triaged</label>
                            <label>query-44-grooming</label>
                            <label>update</label>
                    </labels>
                <created>Fri, 13 Jul 2012 13:03:05 +0000</created>
                <updated>Wed, 11 Jan 2023 00:07:29 +0000</updated>
                                                                            <component>Stability</component>
                    <component>Write Ops</component>
                                        <votes>6</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="1635975" author="yousefbasel" created="Mon, 31 Jul 2017 08:23:41 +0000"  >
&lt;p&gt;I don&apos;t think that issue &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30393&quot; title=&quot;MongoDB is accepting duplicate elements within the same level&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30393&quot;&gt;&lt;del&gt;SERVER-30393&lt;/del&gt;&lt;/a&gt; is a duplicate of this issue since the former was reported on a server running Mongo 3.2.9.&lt;br/&gt;
It only happens when inserting the record from R.&lt;/p&gt;

&lt;p&gt;I hope this can be investigated further.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Basel&lt;/p&gt;</comment>
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            <issuekey id="409532">SERVER-30393</issuekey>
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            <issuekey id="50819">SERVER-7070</issuekey>
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            <issuelink>
            <issuekey id="779982">SERVER-41354</issuekey>
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            <issuelink>
            <issuekey id="828725">SERVER-42018</issuekey>
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            <issuelink>
            <issuekey id="268565">SERVER-22885</issuekey>
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            <issuekey id="223139">SERVER-19642</issuekey>
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            <issuekey id="216213">SERVER-19361</issuekey>
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            <issuekey id="74779">SERVER-9637</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="194328">SERVER-17902</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="599880">SERVER-36999</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="284478">SERVER-24048</issuekey>
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