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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-2606]  error: BSONObj size: 17313886 (0x108305E) is invalid. Size must be between 0 and 16793600(16MB) First element: _id: &quot;&quot;</title>
                <link>https://jira.mongodb.org/browse/CSHARP-2606</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description></description>
                <environment></environment>
        <key id="763168">CSHARP-2606</key>
            <summary> error: BSONObj size: 17313886 (0x108305E) is invalid. Size must be between 0 and 16793600(16MB) First element: _id: &quot;&quot;</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="jeff.yemin@mongodb.com">Jeffrey Yemin</assignee>
                                    <reporter username="sakthisathya796@gmail.com">Satya A</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 May 2019 12:11:27 +0000</created>
                <updated>Wed, 19 Jun 2019 02:29:32 +0000</updated>
                            <resolved>Wed, 19 Jun 2019 02:29:32 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2244351" author="ian@10gen.com" created="Mon, 13 May 2019 14:41:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sakthisathya796%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;sakthisathya796@gmail.com&quot;&gt;sakthisathya796@gmail.com&lt;/a&gt; we suspect that this is a situation with your aggregation pipeline creating an intermediate representation larger than 16MB (which is over the cap of the MongoDB server).  Can you please check how large you would expect the &quot;topics&quot; set to get given your data?&lt;/p&gt;</comment>
                            <comment id="2239709" author="sakthisathya796@gmail.com" created="Thu, 9 May 2019 12:28:20 +0000"  >&lt;p&gt;My Code&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Model.aggregate([&lt;br/&gt;
 {&lt;br/&gt;
 &quot;$lookup&quot;: &lt;/p&gt;
{
 &quot;from&quot;: &quot;Subject&quot;,
 &quot;localField&quot;: &quot;subject&quot;,
 &quot;foreignField&quot;: &quot;_id&quot;,
 &quot;as&quot;: &quot;subject&quot;
 }
&lt;p&gt; },&lt;br/&gt;
 {$unwind: {path: &quot;$subject&quot;}},&lt;br/&gt;
 {$unwind: {path: &quot;$topics&quot;}},&lt;br/&gt;
 {&lt;br/&gt;
 &quot;$lookup&quot;: &lt;/p&gt;
{
 &quot;from&quot;: &quot;Topic&quot;,
 &quot;localField&quot;: &quot;topics._id&quot;,
 &quot;foreignField&quot;: &quot;topics._id&quot;,
 &quot;as&quot;: &quot;topic&quot;
 }
&lt;p&gt; },&lt;br/&gt;
 {$group: {_id: &quot;$subject&quot;, topics: {$addToSet: { topic: &apos;$topics&apos;, course: &quot;$topic&quot;}}}},&lt;br/&gt;
 {$group: {_id: &quot;&quot;, data: {$addToSet: {&quot;topics&quot;: &quot;$topics&quot;, &quot;subject&quot;:&quot;$_id&quot;,&quot;_id&quot;: &quot;$_id._id&quot;}}}},&lt;/p&gt;

&lt;p&gt; {&lt;br/&gt;
 $project: &lt;/p&gt;
{
 subject: &quot;$data&quot;
 }
&lt;p&gt; },&lt;br/&gt;
 ]&lt;/p&gt;</comment>
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