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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>
    </build-info>


<item>
            <title>[CSHARP-3713] SelectMany doesn&apos;t support DefaultIfEmpty()</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3713</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;When unwinding lists using SelectMany, there is no way to force&#160;preserveNullAndEmptyArrays in the generated query.&lt;/p&gt;

&lt;p&gt;By adding DefaultIfEmpty() to the SelectMany as follows&lt;/p&gt;

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

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;query.SelectMany(outerObject =&amp;gt; outerObject.InnerArray.DefaultIfEmpty(), (o, a)...&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

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

&lt;p&gt;it would be expected that an unwind with the&#160;preserveNullAndEmptyArrays option would be generated and empty lists that are unwinded would generate a copy of the parent object with a default object of the child.&lt;/p&gt;

&lt;p&gt;By simply changing&#160;MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateSelectMany line 340 from&lt;/p&gt;

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

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&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 groupJoin = node.Source as GroupJoinExpression;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if&lt;/span&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; (groupJoin != &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;null&lt;/span&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; &amp;amp;&amp;amp; isLeftOuterJoin)&#160;&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;to (i.e. remove the restriction to be a group join)&lt;/p&gt;

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

&lt;p&gt;The desired result is achieved. However, this may cause unintended side-effects because I cannot understand why this support is not already there?&lt;/p&gt;</description>
                <environment></environment>
        <key id="1788751">CSHARP-3713</key>
            <summary>SelectMany doesn&apos;t support DefaultIfEmpty()</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="13201">Fixed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="bjorn@livewrapped.com">Bj&#246;rn Andersson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Jun 2021 20:00:44 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:38 +0000</updated>
                            <resolved>Wed, 13 Oct 2021 23:20:34 +0000</resolved>
                                                    <fixVersion>2.14.0</fixVersion>
                                    <component>Linq</component>
                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4123219" author="bjorn@livewrapped.com" created="Thu, 14 Oct 2021 04:42:27 +0000"  >&lt;p&gt;Thank you!&lt;/p&gt;</comment>
                            <comment id="4122999" author="rstam" created="Wed, 13 Oct 2021 23:21:46 +0000"  >&lt;p&gt;Note that we can only support `DefaultIfEmpty` when nested inside an aggregation expression.&lt;/p&gt;

&lt;p&gt;At the top level we don&apos;t know of any way to support `DefaultIfEmpty` because if the pipeline becomes empty before reaching this stage then the following stages don&apos;t even execute.&lt;/p&gt;</comment>
                            <comment id="4122993" author="rstam" created="Wed, 13 Oct 2021 23:20:34 +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;
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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 connectionString = &quot;mongodb://localhost&quot;;&lt;/span&gt;&lt;/pre&gt;
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					&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;
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&lt;p/&gt;</comment>
                            <comment id="4122992" author="xgen-internal-githook" created="Wed, 13 Oct 2021 23:19:58 +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-3713&quot; title=&quot;SelectMany doesn&amp;#39;t support DefaultIfEmpty()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3713&quot;&gt;&lt;del&gt;CSHARP-3713&lt;/del&gt;&lt;/a&gt;: SelectMany doesn&apos;t support DefaultIfEmpty().&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/7fe09a9a53ecbcdbf652928d04d1355fdd644b38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/7fe09a9a53ecbcdbf652928d04d1355fdd644b38&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4091408" author="bjorn@livewrapped.com" created="Wed, 29 Sep 2021 12:01:12 +0000"  >&lt;p&gt;Hi! Do you have some kind of estimate around the new Linq implementation?&lt;/p&gt;

&lt;p&gt;I use a custom build of the driver right now which works, but it would be easier to update to new versions if I could use the official one &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;Thanks!&lt;/p&gt;</comment>
                            <comment id="3908900" author="dmitry.lukyanov" created="Tue, 29 Jun 2021 21:38:18 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bjorn%40livewrapped.com&quot; class=&quot;user-hover&quot; rel=&quot;bjorn@livewrapped.com&quot;&gt;bjorn@livewrapped.com&lt;/a&gt; , this change looks reasonable but at the same time breaking. So we&apos;re going to postpone this until a new LINQ implementation which currently is being actively implemented/reviewed. We will let you know when it will be released.&lt;/p&gt;</comment>
                            <comment id="3889243" author="bjorn@livewrapped.com" created="Mon, 21 Jun 2021 17:00:10 +0000"  >&lt;p&gt;Thank you very much!&lt;/p&gt;

&lt;p&gt;I&apos;m aware of alternative solutions - I have working code that handle this, but I&apos;m moving this code over to 100% linq since the code becomes a lot easier to read and easier to understand for non MongoDB experts.&lt;/p&gt;

&lt;p&gt;Everything is ported, this is the last part missing. I&apos;m currently using a patched version of the driver, but I&apos;d much rater user the official driver of course.&lt;/p&gt;

&lt;p&gt;I already made a PR with the changes I made (&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/553&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/553&lt;/a&gt;) but with my very limited knowledge of the driver&apos;s internals, I expect more work needs to be done (although I haven&apos;t really found anything while looking).&lt;/p&gt;

&lt;p&gt;Thanks again!&lt;/p&gt;</comment>
                            <comment id="3889203" author="dmitry.lukyanov" created="Mon, 21 Jun 2021 16:51:31 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bjorn%40livewrapped.com&quot; class=&quot;user-hover&quot; rel=&quot;bjorn@livewrapped.com&quot;&gt;bjorn@livewrapped.com&lt;/a&gt; , thanks for your report, we&apos;re able to reproduce this case and going to discuss it whether it&apos;s safe to change this behavior. We will let you know.&#160;&lt;/p&gt;

&lt;p&gt;Also, pay attention that you can reach the same behavior you request with this aggregation code:&lt;/p&gt;
&lt;p/&gt;
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					&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;	.Aggregate()&lt;/span&gt;&lt;/pre&gt;
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					&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;	.Unwind(e =&amp;gt; e.InnerArray, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&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; AggregateUnwindOptions&amp;lt;RootElement&amp;gt;() { PreserveNullAndEmptyArrays = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;true&lt;/span&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; })&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;</comment>
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