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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-3094] Applying Match Criteria to Selected Field Display</title>
                <link>https://jira.mongodb.org/browse/SERVER-3094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When searching sub documents there are times when it is ideal to select individual fields based on your matching clause. When MongoDB does a query with a match and field selection it seems to drop the matching clause when handling the field selection. To help detail what I am talking about, assume you have the following:&lt;/p&gt;

&lt;p&gt;{ &quot;_id&quot; : ObjectId(&quot;4dcebcb7441737b80c5db656&quot;), &quot;hash&quot; : &quot;123456&quot;, &quot;contents&quot; : [&lt;br/&gt;
	&lt;/p&gt;
{
		&quot;user&quot; : &quot;brandon&quot;,
		&quot;flags&quot; : [
			&quot;checked&quot;
		]
	}
&lt;p&gt;,&lt;/p&gt;
	{
		&quot;user&quot; : &quot;dixon&quot;,
		&quot;flags&quot; : [ ]
	}
&lt;p&gt;] }&lt;/p&gt;

&lt;p&gt;This document is pretty straight forward to understand. What I want to extract from this document is the &quot;flags&quot; portion for a given user. To do this I put together the following query:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.tmp1.find(&lt;/p&gt;
{&apos;hash&apos;:&apos;123456&apos;,&apos;contents.user&apos;:&apos;brandon&apos;}
&lt;p&gt;,&lt;/p&gt;
{&apos;contents.flags&apos;:1}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;You can see here that I am matching based on the what would be unique hash, and the user with the value of brandon. In this case I am selecting the flags field as the only output to show on the results. The following is what I get:&lt;/p&gt;

&lt;p&gt;{ &quot;_id&quot; : ObjectId(&quot;4dcebcb7441737b80c5db656&quot;), &quot;contents&quot; : [ &lt;/p&gt;
{ &quot;flags&quot; : [ &quot;checked&quot; ] }
&lt;p&gt;, &lt;/p&gt;
{ &quot;flags&quot; : [ ] }
&lt;p&gt; ] }&lt;/p&gt;

&lt;p&gt;As you can see here, I got my flags that I wanted, but I also picked up the flags field from the &quot;dixon&quot; user. This is not the expected result of the query as my matching clause only said to match those with the user &quot;brandon&quot;. It appears that MongoDB only uses the match clauses when doing the initial search, but it does not apply them to the selected output fields. &lt;/p&gt;</description>
                <environment>Ubuntu 10 LTS</environment>
        <key id="17082">SERVER-3094</key>
            <summary>Applying Match Criteria to Selected Field Display</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="9bplus">Brandon Dixon</reporter>
                        <labels>
                            <label>fields</label>
                            <label>matching</label>
                            <label>output</label>
                            <label>query</label>
                    </labels>
                <created>Sat, 14 May 2011 17:50:26 +0000</created>
                <updated>Fri, 7 Mar 2014 01:02:34 +0000</updated>
                            <resolved>Sat, 14 May 2011 21:05:26 +0000</resolved>
                                    <version>1.8.1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="11615">SERVER-828</issuekey>
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