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    <title>MongoDB Jira</title>
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    <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>[CSHARP-4247] Permit empty objects as expressions in $set and $addFields aggregation stages</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4247</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;This ticket was split from &lt;tt&gt;DRIVERS-2374&lt;/tt&gt;, please see that ticket for a detailed description. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2087748">CSHARP-4247</key>
            <summary>Permit empty objects as expressions in $set and $addFields aggregation stages</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="james.kovacs@mongodb.com">James Kovacs</assignee>
                                    <reporter username="dbeng-pm-bot">PM Bot</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jul 2022 16:38:54 +0000</created>
                <updated>Fri, 27 Oct 2023 13:24:40 +0000</updated>
                            <resolved>Wed, 7 Sep 2022 00:25:32 +0000</resolved>
                                                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4806698" author="james.kovacs" created="Wed, 7 Sep 2022 00:25:32 +0000"  >&lt;p&gt;The LINQ3 AST contains &lt;tt&gt;AstAddFieldsStage&lt;/tt&gt; and &lt;tt&gt;AstSetStage&lt;/tt&gt;, though we currently don&apos;t translate any LINQ constructs to these stages. Both stages allow computed fields set to empty documents. No work is required to support this feature when these stages are supported.&lt;/p&gt;</comment>
                    </comments>
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                                        <label>6.1</label>
    
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                            <customfieldvalue>&lt;p&gt;DRIVERS-2374:&lt;br/&gt;
$addFields and $set will no longer throw an error if you want to set a path to an empty object.&lt;br/&gt;
For example the stage {$set: {a: {}}} would take an incoming document and set the &apos;a&apos; field to an empty object.&lt;br/&gt;
The behavior of $project behavior has not been changed and in order to get the same behavior a user would still have to wrap the object with $literal like this: {$project: {a: {$literal: {}}}}&lt;/p&gt;</customfieldvalue>

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