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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-488] Support joins in Linq</title>
                <link>https://jira.mongodb.org/browse/CSHARP-488</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;I would like to have joins supported, to join multiple collections. For instance:&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;
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					&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 matches = (from driver in driverCollection.AsQueryable()&lt;/span&gt;&lt;/pre&gt;
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				&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;                   join car in carCollection.AsQueryable() on driver.CarId equals car.Id&lt;/span&gt;&lt;/pre&gt;
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				&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;                   where driver.Name == &quot;Tim Kellogg&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;                   select new { DriverName = driver.Name, CarNumber = car.Number }).ToArray();&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I would assume that the initial naive algorithm would be &lt;/p&gt;

&lt;p&gt;  1. Get all drivers that match the WHERE clause&lt;br/&gt;
  2. Get all cars that satisfy the ON clause (and the WHERE, if it applies)&lt;br/&gt;
  3. Do the SELECT clause&lt;/p&gt;</description>
                <environment></environment>
        <key id="40642">CSHARP-488</key>
            <summary>Support joins in Linq</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="craig.wilson@mongodb.com">Craig Wilson</assignee>
                                    <reporter username="tkellogg">Tim Kellogg</reporter>
                        <labels>
                            <label>join</label>
                            <label>linq</label>
                            <label>query</label>
                    </labels>
                <created>Thu, 7 Jun 2012 04:16:05 +0000</created>
                <updated>Thu, 20 Mar 2014 14:34:12 +0000</updated>
                            <resolved>Mon, 11 Jun 2012 19:18:54 +0000</resolved>
                                    <version>1.4.2</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="130491" author="craiggwilson" created="Mon, 11 Jun 2012 19:18:54 +0000"  >&lt;p&gt;Tim, thanks for your feature request.  The server does  not support joins and pulling back multiple datasets and joining them on the client side would have extremely poor performance.  Therefore, we will not be adding join support into the linq provider.  &lt;/p&gt;</comment>
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