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<channel>
    <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>[SERVER-59713] `$unwind` doesn&apos;t work on array subdocument fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-59713</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Given the following document:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;db.collection.insertOne({&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;&#160; items: [&lt;/tt&gt;&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;&#160; &#160; &#160; _id: ObjectId,&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;&#160; &#160; &#160; name: &apos;foobar&apos;&lt;/tt&gt;&lt;/p&gt;

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

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

&lt;p&gt;&lt;tt&gt;});&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;Trying to `$unwind` the field path `$items.name` outputs &lt;b&gt;nothing&lt;/b&gt;.&lt;/p&gt;

&lt;p&gt;On the other hand, the output of this:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;db.collection.aggregate([&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;&#160; {&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;&#160; &#160; $project: {&lt;/tt&gt;&lt;br/&gt;
{{&#160; &#160; &#160; type: { $type: &apos;$items.name&apos; }}}&lt;br/&gt;
{{&#160; &#160; }}}&lt;br/&gt;
{{&#160; }}}&lt;br/&gt;
&lt;tt&gt;]);&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;is the following:&lt;/p&gt;

&lt;p&gt;{{{}}&lt;br/&gt;
&lt;tt&gt;&#160; &quot;_id&quot; : ObjectId(&quot;...&quot;),&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;&#160; &quot;type&quot; : &quot;array&quot;&lt;/tt&gt;&lt;br/&gt;
&lt;tt&gt;}&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;If the expression `$items.name` resolves to an array then why can I not `$unwind` this field path?&lt;/p&gt;</description>
                <environment></environment>
        <key id="1865389">SERVER-59713</key>
            <summary>`$unwind` doesn&apos;t work on array subdocument fields</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="11262" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Investigating</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="kateryna.kamenieva@mongodb.com">Katya Kamenieva</assignee>
                                    <reporter username="amitbeck@gmail.com">Amit Beckenstein</reporter>
                        <labels>
                            <label>$unwind</label>
                            <label>aggregation-framework</label>
                    </labels>
                <created>Wed, 1 Sep 2021 15:33:18 +0000</created>
                <updated>Wed, 17 Jan 2024 17:43:15 +0000</updated>
                                            <version>4.4.2</version>
                                                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="6018198" author="JIRAUSER1254095" created="Wed, 17 Jan 2024 17:42:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kateryna.kamenieva%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kateryna.kamenieva@mongodb.com&quot;&gt;kateryna.kamenieva@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris@mongodb.com&quot;&gt;christopher.harris@mongodb.com&lt;/a&gt; may we get an update on this ticket? It&apos;s been in &quot;Investigating&quot; status for quite sometime.&lt;/p&gt;

&lt;p&gt;Please refer to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73888&quot; title=&quot;Aggregation Pipeline: $unwind always gives an empty result with nested fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73888&quot;&gt;&lt;del&gt;SERVER-73888&lt;/del&gt;&lt;/a&gt; if you need additional help reproducing it.&lt;/p&gt;</comment>
                            <comment id="5343050" author="william.tan" created="Wed, 12 Apr 2023 23:11:15 +0000"  >&lt;p&gt;Changing the type of this ticket to &quot;Bug&quot; upon customer request.&lt;/p&gt;</comment>
                            <comment id="5187428" author="JIRAUSER1269373" created="Fri, 10 Feb 2023 18:32:11 +0000"  >&lt;p&gt;@Johnny Shields haha I know that I can use `$project`, in my actual implementation I was using `$addFields` intentionally.&lt;/p&gt;</comment>
                            <comment id="5187382" author="JIRAUSER1254095" created="Fri, 10 Feb 2023 18:16:29 +0000"  >&lt;p&gt;@christopher.harris@mongodb.com &amp;gt; &lt;br/&gt;
When fixing this ticket, please also verify that the behavior of the $unwind &quot;preserveNullAndEmptyArrays&quot; parameter true/false works correctly with subdocument fields.&lt;/p&gt;</comment>
                            <comment id="5187368" author="JIRAUSER1254095" created="Fri, 10 Feb 2023 18:13:08 +0000"  >&lt;p&gt;FYI, you can use a $project instead of $addFields in order to avoid modifying your documents.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$project&quot;&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;p&quot;&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;gt; &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$addresses.city&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; } }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$unwind&quot;&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;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$p&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{ &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$group&quot;&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;: { _id: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$p&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, counts: { &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$sum&quot;&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&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;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;But this still should be fixed.&lt;/p&gt;</comment>
                            <comment id="4807744" author="JIRAUSER1269373" created="Wed, 7 Sep 2022 12:54:32 +0000"  >&lt;p&gt;@christopher.harris@mongodb.com Any update? It&apos;s been almost a year&lt;/p&gt;</comment>
                            <comment id="4077476" author="JIRAUSER1269373" created="Wed, 22 Sep 2021 14:35:57 +0000"  >&lt;p&gt;Hi @christopher.harris,&lt;/p&gt;

&lt;p&gt;The system might very well be working as designed currently. I&apos;m not sure if this is a bug or a feature request, but I&apos;ll do my best to explain my use case for support of such functionality.&lt;/p&gt;

&lt;p&gt;First, to answer your request: the output I would expect when issuing an &lt;tt&gt;$unwind&lt;/tt&gt; on &lt;tt&gt;&quot;$arrayField.stringValue&quot;&lt;/tt&gt; (which is the equivalent to &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; in my example, yes) is&#160;the same output which I would expect when issuing an &lt;tt&gt;$unwind&lt;/tt&gt; on &lt;tt&gt;&quot;$arrayField&quot;&lt;/tt&gt; itself.&lt;/p&gt;

&lt;p&gt;An excerpt of my use case is such:&#160;&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;let parameterFieldPath = &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$items.name&apos;&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;
			&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;&amp;nbsp;&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;db.collection.aggregate([&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;  { $unwind: parameterFieldPath },&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;  {&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;    $group: {&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;      _id: parameterFieldPath,&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;      items: { $push: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$$ROOT&apos;&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;
			&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;  }&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;]);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;As seen above, I have to &lt;tt&gt;$unwind&lt;/tt&gt; an array whose field path is specified in &lt;tt&gt;parameterFieldPath&lt;/tt&gt; (which is &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; in our example), and then &lt;tt&gt;$group&lt;/tt&gt; the output documents by the same &lt;tt&gt;parameterFieldPath&lt;/tt&gt;. &lt;tt&gt;parameterFieldPath&lt;/tt&gt; is variable, and its value can be changed according to a user&apos;s settings.&lt;br/&gt;
 Currently, this doesn&apos;t work, and the only workaround is doing something like this:&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;let parameterFieldPath = &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$items.name&apos;&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;
			&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;&amp;nbsp;&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;db.collection.aggregate([&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;  {&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;    &lt;/span&gt;&lt;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// TODO: Remove stage once using version in which https://jira.mongodb.org/browse/SERVER-59713 is fixed&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;    $addFields: {&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;      parameterValue: parameterFieldPath&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;    }&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;  },&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;  { $unwind: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$parameterValue&apos;&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;
			&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;  {&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;    $group: {&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;      _id: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$parameterValue&apos;&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;
			&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;      items: { $push: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;$$ROOT&apos;&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;
			&lt;/td&gt;
		&lt;/tr&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;  }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&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;]);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;But this leaves me with an unwanted&#160;temporary &lt;tt&gt;parameterValue&lt;/tt&gt; field on each document. BTW the &lt;tt&gt;TODO&lt;/tt&gt; is taken from our code &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.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;I hope my use case was clear enough.&lt;br/&gt;
 As I&apos;ve said before, I&apos;m not sure whether this is a bug or a feature request - feel free to change the issue type accordingly.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
 Amit&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4072467" author="christopher.harris" created="Mon, 20 Sep 2021 19:33:00 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=amitbeck%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;amitbeck@gmail.com&quot;&gt;amitbeck@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Based on our reading of the ticket description, we believe that the system may be working as designed currently.&#160; However, can you please give an example of what output you would expect when issuing an &lt;tt&gt;$unwind&lt;/tt&gt; on &lt;tt&gt;&quot;$arrayField.stringValue&quot;&lt;/tt&gt; ( &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; in your example)?&#160; Based on the workaround you noted, it seems you are looking to create documents that each contain the value of the &lt;tt&gt;name&lt;/tt&gt; field that is embedded in one of the subdocuments in the &lt;tt&gt;items&lt;/tt&gt; array?&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;$unwind&lt;/tt&gt; operator intends to have a field name that resolves to an array as its argument. This is why, as you&apos;ve observed, the stage { $unwind: &quot;$temp&quot; } outputs results. In that situation,&#160;&lt;tt&gt;$temp&lt;/tt&gt; now represents an array of string values that was generated from the original array of subdocuments.&#160; You could similarly choose to &lt;tt&gt;$unwind&lt;/tt&gt; the array of subdocuments ( &lt;tt&gt;$items&lt;/tt&gt;&#160;) first and then rename or remove fields afterwards based on the desired logic.&#160; Furthermore, it is also possible to use or reference the individual values via the &lt;tt&gt;&quot;$items.name&quot;&lt;/tt&gt; syntax in later aggregation stages after the &lt;tt&gt;&quot;items&quot;&lt;/tt&gt; array has been unwound.&#160; How are you intending to use this field later in the aggregation pipeline?&lt;/p&gt;

&lt;p&gt;Similar confusion has &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8089&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;come up before&lt;/a&gt;.&#160; The fact that the projection using the &lt;tt&gt;$type&lt;/tt&gt; operator reported the field path as an array has to do with the fact that &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/type/#-type&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the $type aggregation operator does not examine array &lt;em&gt;elements&lt;/em&gt;&lt;/a&gt;.&#160; Depending on the feedback you provide to the questions above, we may wish to convert this ticket into an improvement request.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Chris&lt;/p&gt;</comment>
                            <comment id="4054910" author="thomas.schubert" created="Mon, 13 Sep 2021 20:11:11 +0000"  >&lt;p&gt;Thanks for the report, passing this along to the query team to investigate. Please continue to watch this ticket for updates.&lt;/p&gt;</comment>
                            <comment id="4034021" author="JIRAUSER1269373" created="Wed, 1 Sep 2021 15:43:36 +0000"  >&lt;p&gt;The workaround for now is something of the sorts:&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;db.collection.aggregate([&lt;/tt&gt;&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;&#160; &#160; $addFields:&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;&#160; &#160; &#160; temp: &apos;$items.name&apos;&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;&#160; },&lt;/tt&gt;&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;&#160; &#160; $unwind: &apos;$temp&apos;&lt;/tt&gt;&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;]);&lt;/tt&gt;&lt;/p&gt;</comment>
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&lt;p&gt;&lt;tt&gt;&#160; items: [&lt;/tt&gt;&lt;/p&gt;

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

&lt;p&gt;&lt;tt&gt;&#160; &#160; &#160; _id: ObjectId,&lt;/tt&gt;&lt;/p&gt;

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