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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-3245] $addToSet and $each with an array does not filter duplicates for new field.</title>
                <link>https://jira.mongodb.org/browse/SERVER-3245</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am not sure if this is a regression or if the original bug &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2249&quot; title=&quot;$addToSet with $each doesn&amp;#39;t check uniqueness for new elements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2249&quot;&gt;&lt;del&gt;SERVER-2249&lt;/del&gt;&lt;/a&gt; was not fixed completely.&lt;/p&gt;

&lt;p&gt;If the field already exists then the duplicates are correctly filtered.&lt;br/&gt;
&amp;#8212;&lt;br/&gt;
db.test.insert({_id:&quot;test_add_to_set&quot;,arr:[]})&lt;br/&gt;
db.test.update({_id:&quot;test_add_to_set&quot;}, {$addToSet:{arr:{$each:&lt;span class=&quot;error&quot;&gt;&amp;#91;1,1&amp;#93;&lt;/span&gt;}}})&lt;br/&gt;
db.test.find()&lt;/p&gt;
{ &quot;_id&quot; : &quot;test_add_to_set&quot;, &quot;arr&quot; : [ 1 ] }
&lt;p&gt;&amp;#8212;&lt;/p&gt;

&lt;p&gt;If, however, the field is new then all of the values are added.&lt;br/&gt;
&amp;#8212;&lt;br/&gt;
db.test.insert({_id:&quot;test_add_to_set&quot;})&lt;br/&gt;
db.test.update({_id:&quot;test_add_to_set&quot;}, {$addToSet:{arr:{$each:&lt;span class=&quot;error&quot;&gt;&amp;#91;1,1&amp;#93;&lt;/span&gt;}}})&lt;br/&gt;
db.test.find()&lt;/p&gt;
{ &quot;_id&quot; : &quot;test_add_to_set&quot;, &quot;arr&quot; : [ 1, 1 ] }
&lt;p&gt;&amp;#8212;&lt;/p&gt;

&lt;p&gt;I was able to reproduce this in version 1.8.1.&lt;/p&gt;

&lt;p&gt;Cheers,&lt;br/&gt;
Leif&lt;/p&gt;</description>
                <environment></environment>
        <key id="18171">SERVER-3245</key>
            <summary>$addToSet and $each with an array does not filter duplicates for new field.</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="tonyh">Tony Hannan</assignee>
                                    <reporter username="leif">Leif Mortenson</reporter>
                        <labels>
                    </labels>
                <created>Sun, 12 Jun 2011 16:05:43 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:09 +0000</updated>
                            <resolved>Thu, 22 Sep 2011 21:10:01 +0000</resolved>
                                    <version>1.8.1</version>
                                    <fixVersion>2.1.0</fixVersion>
                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="56040" author="auto" created="Thu, 22 Sep 2011 22:12:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;TonyGen&apos;, u&apos;name&apos;: u&apos;Tony Hannan&apos;, u&apos;email&apos;: u&apos;tony@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3245&quot; title=&quot;$addToSet and $each with an array does not filter duplicates for new field.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3245&quot;&gt;&lt;del&gt;SERVER-3245&lt;/del&gt;&lt;/a&gt;: fix my previous commit&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5bc9ef436a40c6002b4c9f1229c17aab96e01710&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5bc9ef436a40c6002b4c9f1229c17aab96e01710&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="56024" author="auto" created="Thu, 22 Sep 2011 21:08:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;TonyGen&apos;, u&apos;name&apos;: u&apos;Tony Hannan&apos;, u&apos;email&apos;: u&apos;tony@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3245&quot; title=&quot;$addToSet and $each with an array does not filter duplicates for new field.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3245&quot;&gt;&lt;del&gt;SERVER-3245&lt;/del&gt;&lt;/a&gt;: $addToSet $each filter dups of new field&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6a5bed92f5ba424b965f4c3552cd5dc2b0dc28ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6a5bed92f5ba424b965f4c3552cd5dc2b0dc28ce&lt;/a&gt;&lt;/p&gt;</comment>
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