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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-45016] Grouping/accumulating with a switch expression doesn&apos;t yield the expected result</title>
                <link>https://jira.mongodb.org/browse/SERVER-45016</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;m not exactly sure this isn&apos;t by definition but it definitely doesn&apos;t make sense and I haven&apos;t seen it in the documentation. Please check the example in the &quot;Steps to Reproduce&quot;. The same is true for the `_id` field - when using `switch` - only one of the values is used (perhaps the &quot;longest&quot;?) while I would expect each document to be evaluated separately on that switch. Am I missing something? How am I supposed to do this correctly or is this really a bug as I think?&lt;/p&gt;</description>
                <environment>Arch Linux</environment>
        <key id="1041379">SERVER-45016</key>
            <summary>Grouping/accumulating with a switch expression doesn&apos;t yield the expected result</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="-1">Unassigned</assignee>
                                    <reporter username="alien">Boris Petrov</reporter>
                        <labels>
                    </labels>
                <created>Sun, 8 Dec 2019 18:30:09 +0000</created>
                <updated>Mon, 9 Dec 2019 13:49:32 +0000</updated>
                            <resolved>Mon, 9 Dec 2019 13:49:32 +0000</resolved>
                                    <version>4.2.1</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2593530" author="carl.champain" created="Mon, 9 Dec 2019 13:49:19 +0000"  >&lt;p&gt;Thank you &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alien&quot; class=&quot;user-hover&quot; rel=&quot;alien&quot;&gt;alien&lt;/a&gt;. I&apos;m going to close this ticket then.&lt;/p&gt;</comment>
                            <comment id="2593185" author="alien" created="Mon, 9 Dec 2019 09:24:18 +0000"  >&lt;p&gt;Actually I now see that changing `null` to `undefined` fixes the issue. I should have thought that checks in Mongo are done by using `===` and not `==`. This issue can be closed.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;db.test.insert({ a: 1 })&lt;br/&gt;
db.test.insert({ a: &lt;/p&gt;
{ b: 2 }
&lt;p&gt; })&lt;br/&gt;
db.test.insert({ a: { b: &lt;/p&gt;
{ c: 3 }
&lt;p&gt; } })&lt;/p&gt;

&lt;p&gt;db.test.aggregate([{ $group: { _id: null, sum: { $sum: { $switch: { branches: [{ case: &lt;/p&gt;
{ $ne: [&apos;$a.b.c&apos;, null] }
&lt;p&gt;, then: &apos;$a.b.c&apos; }, { case: &lt;/p&gt;
{ $ne: [&apos;$a.b&apos;, null] }
&lt;p&gt;, then: &apos;$a.b&apos; }, { case: &lt;/p&gt;
{ $ne: [&apos;$a&apos;, null] }
&lt;p&gt;, then: &apos;$a&apos; }] } } } } }])&lt;/p&gt;

&lt;p&gt;The expected result would be `6`, but instead I get:&lt;/p&gt;

{ &quot;_id&quot; : null, &quot;sum&quot; : 3 }</customfieldvalue>

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