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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>[CSHARP-1486] Support $$ROOT in LINQ for agg</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1486</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The expected behavior of GroupBy method on LINQ is to return a IGrouping&amp;lt;TKey,TDocument&amp;gt;, where TKey is the group key type and TDocument is a IEnumerable&amp;lt;TDocument&amp;gt;. In this case it returns an empty IEnumerable.&lt;/p&gt;

&lt;p&gt;Is this the expected behavior? Becasue this in not the expected in other LINQ implementations.&lt;/p&gt;</description>
                <environment>Windows, C#, MongoDB 3.0.7</environment>
        <key id="240768">CSHARP-1486</key>
            <summary>Support $$ROOT in LINQ for agg</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="ccasanova81">Carlos Casanova</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Nov 2015 20:06:16 +0000</created>
                <updated>Tue, 2 Nov 2021 18:05:26 +0000</updated>
                            <resolved>Tue, 2 Nov 2021 18:05:26 +0000</resolved>
                                    <version>2.1.1</version>
                                    <fixVersion>2.14.0</fixVersion>
                                    <component>Linq</component>
                                        <votes>2</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4164503" author="rstam" created="Tue, 2 Nov 2021 18:05:26 +0000"  >&lt;p&gt;This issue has been fixed in the new LINQ provider (known as LINQ3) which will be included in the upcoming 2.14 release.&lt;/p&gt;

&lt;p&gt;Configure your &lt;tt&gt;MongoClientSettings&lt;/tt&gt; to use &lt;tt&gt;LinqProvider.V3&lt;/tt&gt; if you want to use this functionality.&lt;/p&gt;

&lt;p&gt;To configure a client to use the LINQ3 provider use code like the following&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;var connectionString = &quot;mongodb://localhost&quot;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;var clientSettings = MongoClientSettings.FromConnectionString(connectionString);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;clientSettings.LinqProvider = LinqProvider.V3;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 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;var client = new MongoClient(clientSettings);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="4164500" author="xgen-internal-githook" created="Tue, 2 Nov 2021 18:04:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1486&quot; title=&quot;Support $$ROOT in LINQ for agg&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-1486&quot;&gt;&lt;del&gt;CSHARP-1486&lt;/del&gt;&lt;/a&gt;: Verify that GroupBy works with $$ROOT in LINQ3.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/540636d26c312bb224f7d94f63bb037a99a9f8db&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/540636d26c312bb224f7d94f63bb037a99a9f8db&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1096977" author="craiggwilson" created="Tue, 24 Nov 2015 13:37:22 +0000"  >&lt;p&gt;I&apos;m sorry. I was apparently unclear. We need to do this inside the driver. There is not a way for you to do this right now.&lt;/p&gt;

&lt;p&gt;Craig&lt;/p&gt;</comment>
                            <comment id="1096192" author="ccasanova81" created="Mon, 23 Nov 2015 20:13:24 +0000"  >&lt;p&gt;That&apos;s good to know, but I couldn&apos;t find a way to use $$ROOT from LINQ. Is there any place in the documentation that explains this?&lt;/p&gt;</comment>
                            <comment id="1096187" author="craiggwilson" created="Mon, 23 Nov 2015 20:08:59 +0000"  >&lt;p&gt;This is currently expected behavior. MongoDB sort of supports this behavior using the special $$ROOT global variable. Also If you continue on in the LINQ query and create some aggregates, it will work with those. I&apos;ll leave this ticket open as an improvement to support this using $$ROOT.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1905674">CSHARP-3933</issuekey>
        </issuelink>
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                                                        </issuelinktype>
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