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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-11825] does $addToSet cause index to be rebuilt even when document didn&apos;t change?</title>
                <link>https://jira.mongodb.org/browse/SERVER-11825</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;i would like to know if performing an $addToSet on an indexed field would cause an index on this field to be rebuilt even if there is no actual change to the field?&lt;/p&gt;

&lt;p&gt;for example, if one performed update({ $addToSet: &lt;/p&gt;
{ &apos;list&apos;: &apos;b&apos; }
&lt;p&gt; }) on such a document:&lt;br/&gt;
{&lt;br/&gt;
 _id: 1&lt;br/&gt;
 &apos;list&apos;: &lt;span class=&quot;error&quot;&gt;&amp;#91;&amp;#39;a&amp;#39;, &amp;#39;b&amp;#39;, &amp;#39;c&amp;#39;&amp;#93;&lt;/span&gt;&lt;br/&gt;
}&lt;/p&gt;</description>
                <environment></environment>
        <key id="99595">SERVER-11825</key>
            <summary>does $addToSet cause index to be rebuilt even when document didn&apos;t change?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="pcmaniac">Nemanja Dubravac</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Nov 2013 15:58:00 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:22 +0000</updated>
                            <resolved>Wed, 27 Nov 2013 02:46:58 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="462474" author="eliot" created="Wed, 27 Nov 2013 02:46:52 +0000"  >&lt;p&gt;In that example, no, nothing should happen.&lt;br/&gt;
In general, we compute an index diff by extracting the keys on the old and new doc, and then only do the deltas.&lt;/p&gt;</comment>
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