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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-7932] Change handling of nullish values in math expressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-7932</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently when a nullish (missing/EOO, Undefined, or Null) value is used in a math expression such as $add, we treat it as 0. I think a better behavior would be to make the output always be NULL if any input value is nullish. If users want the old behavior, they can use $ifNull:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{$mulitply: [10, &apos;$value&apos;]} -&amp;gt; {$multiply:[10, {$ifNull:[&apos;$value&apos;, 0]}]}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Note: this change only applies to the expressions $add, $multiply, $subtract, etc. The $group accumulators ($min, $max, $sum, and $avg) will continue to ignore nullish values.&lt;/p&gt;</description>
                <environment></environment>
        <key id="59338">SERVER-7932</key>
            <summary>Change handling of nullish values in math expressions</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Dec 2012 20:48:30 +0000</created>
                <updated>Wed, 28 Oct 2015 04:26:18 +0000</updated>
                            <resolved>Mon, 17 Dec 2012 19:56:28 +0000</resolved>
                                                    <fixVersion>2.3.2</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="215478" author="auto" created="Sat, 15 Dec 2012 00:24:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-14T21:02:41Z&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: Improve aggregation handling of nullish Values - part 2&lt;/p&gt;

&lt;p&gt;Changes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Nullish values in math expressions (but not accumulators) result in NULL.&lt;/li&gt;
	&lt;li&gt;$divide or $mod by 0 now uasserts.&lt;/li&gt;
	&lt;li&gt;uassert in math expressions if inputs are neither nullish nor numeric.&lt;/li&gt;
	&lt;li&gt;$group fills missing accumulators with NULL rather than Undefined.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Related Tickets:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7932&quot; title=&quot;Change handling of nullish values in math expressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7932&quot;&gt;&lt;del&gt;SERVER-7932&lt;/del&gt;&lt;/a&gt; Fix handling of nullish Values in math expressions&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6144&quot; title=&quot;Aggregation should error out on divide or mod by zero&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6144&quot;&gt;&lt;del&gt;SERVER-6144&lt;/del&gt;&lt;/a&gt; $divide by 0 makes field disappear&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/69ceee8d9c8008b974f11937941e7a591124b82c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/69ceee8d9c8008b974f11937941e7a591124b82c&lt;/a&gt;&lt;/p&gt;</comment>
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