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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>[SERVER-10030] Empty parent returned where projection key doesn&apos;t exist</title>
                <link>https://jira.mongodb.org/browse/SERVER-10030</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using dot notation to construct a projection on sub document keys, if the key specified in the project doesn&apos;t exist it returns the next ancestor which does exist, but as an empty document.&lt;/p&gt;</description>
                <environment></environment>
        <key id="80329">SERVER-10030</key>
            <summary>Empty parent returned where projection key doesn&apos;t exist</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="stephen.steneker@mongodb.com">Stennie Steneker</assignee>
                                    <reporter username="mattcampbell">Matt Campbell</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Jun 2013 04:09:31 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:50 +0000</updated>
                            <resolved>Tue, 13 Aug 2013 00:50:22 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="401520" author="stennie" created="Tue, 13 Aug 2013 00:50:13 +0000"  >&lt;p&gt;Hi Matt,&lt;/p&gt;

&lt;p&gt;This is the expected outcome given your query and projection.&lt;/p&gt;

&lt;p&gt;If you wanted to get nil results you can use &lt;tt&gt;$exists&lt;/tt&gt; in the criteria so you only match documents where that key exists:&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;   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;db.test.find({&apos;level1.level2.key2&apos;: { $exists:true}}, {&apos;level1.level2.key2&apos;:1,&apos;_id&apos;:0})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;// Returns immediate parent which exists&lt;br/&gt;
db.test.insert({&apos;level1&apos;:{&apos;level2&apos;:&lt;/p&gt;
{&apos;key&apos;:&apos;value&apos;}
&lt;p&gt;}})&lt;br/&gt;
db.test.find({}, &lt;/p&gt;
{&apos;level1.level2.key2&apos;:1,&apos;_id&apos;:0}
&lt;p&gt;)&lt;br/&gt;
Result: { &quot;level1&quot; : { &quot;level2&quot; : {  } } }&lt;br/&gt;
Expected: Nothing&lt;/p&gt;

&lt;p&gt;// Returns 2 parents up which exists&lt;br/&gt;
db.test.insert({&apos;level1&apos;:{&apos;key&apos;:&apos;value&apos;}})&lt;br/&gt;
db.test.find({}, &lt;/p&gt;
{&apos;level1.level2.key2&apos;:1,&apos;_id&apos;:0}
&lt;p&gt;)&lt;br/&gt;
Result: { &quot;level1&quot; : {  } }&lt;br/&gt;
Expected: Nothing&lt;/p&gt;

&lt;p&gt;It should be noted that if there was a projection for keys within the respective docs returned they would be showed. However, I&apos;m not sure why an empty sub doc is returned when no other projections are made for it.&lt;/p&gt;

&lt;p&gt;Is this an intended design or a bug?&lt;/p&gt;</customfieldvalue>

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