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    <title>MongoDB Jira</title>
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    <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-66969] The $add aggregation expression is not always commutative</title>
                <link>https://jira.mongodb.org/browse/SERVER-66969</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The $add expression is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2b011507f069c89981f084ac7b8e0eaf06bb6ea3/src/mongo/db/pipeline/expression.h#L934-L936&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;defined as being commutative&lt;/a&gt;, which is not true when a null value exists in the list being summed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2060764">SERVER-66969</key>
            <summary>The $add aggregation expression is not always commutative</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="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Jun 2022 17:15:32 +0000</created>
                <updated>Tue, 6 Dec 2022 00:03:48 +0000</updated>
                            <resolved>Thu, 9 Jun 2022 18:42:12 +0000</resolved>
                                    <version>6.0.0-rc8</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4605427" author="davis.haupt" created="Thu, 9 Jun 2022 18:21:38 +0000"  >&lt;p&gt;This can probably be closed as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63099&quot; title=&quot;Constant folding should not assume arithmetic is associative or commutative in the general case&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63099&quot;&gt;&lt;del&gt;SERVER-63099&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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&lt;p&gt;db.test.insert({_id: 1, x: new Date()});&lt;/p&gt;

&lt;p&gt;// Returns a result.&lt;br/&gt;
db.test.aggregate([{$project: {a: {$add: &lt;span class=&quot;error&quot;&gt;&amp;#91;null, new Date(), &amp;quot;$x&amp;quot;&amp;#93;&lt;/span&gt;}}}])&lt;/p&gt;

&lt;p&gt;// Fails with error code 16612, &quot;only one date allowed in an $add expression&quot;.&lt;br/&gt;
db.test.aggregate([{$project: {a: {$add: &lt;span class=&quot;error&quot;&gt;&amp;#91;new Date(), &amp;quot;$x&amp;quot;, null&amp;#93;&lt;/span&gt;}}}])&lt;/p&gt;</customfieldvalue>

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