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    <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-12860] Index on sub-document in _id</title>
                <link>https://jira.mongodb.org/browse/SERVER-12860</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;we have a database design with a sub-document in the _id field. Now we have the problem the the field order matters (compare documentation &lt;a href=&quot;http://docs.mongodb.org/manual/core/index-single/#indexes-on-subdocuments&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/index-single/#indexes-on-subdocuments&lt;/a&gt;) and the following example:&lt;/p&gt;

&lt;p&gt;db.test.insert({&quot;_id&quot;:{&quot;uid&quot;:1, &quot;city&quot;:&quot;Munich&quot;}})&lt;br/&gt;
db.test.insert({&quot;_id&quot;:{&quot;uid&quot;:2, &quot;city&quot;:&quot;Munich&quot;}})&lt;br/&gt;
db.test.insert({&quot;_id&quot;:{&quot;uid&quot;:3, &quot;city&quot;:&quot;Munich&quot;}})&lt;br/&gt;
db.test.insert({&quot;_id&quot;:{&quot;uid&quot;:2, &quot;city&quot;:&quot;Frankfurt&quot;}})&lt;br/&gt;
&amp;gt; db.test.find({&quot;_id&quot;:{&quot;uid&quot;:2, &quot;city&quot;:&quot;Munich&quot;}})&lt;br/&gt;
{ &quot;_id&quot; : &lt;/p&gt;
{ &quot;uid&quot; : 2, &quot;city&quot; : &quot;Munich&quot; }
&lt;p&gt; }&lt;br/&gt;
&amp;gt;&lt;br/&gt;
&amp;gt; db.test.find({&quot;_id&quot;:{&quot;city&quot;:&quot;Munich&quot;, &quot;uid&quot;:2 }})&lt;br/&gt;
NO RESULT&lt;/p&gt;

&lt;p&gt;What is the best solution to solve our issue? Do we have to redesign our complete data structure?&lt;/p&gt;

&lt;p&gt;Thanks a lot&lt;br/&gt;
Markus&lt;/p&gt;
</description>
                <environment></environment>
        <key id="113950">SERVER-12860</key>
            <summary>Index on sub-document in _id</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="markus.schmidberger@comsysto.com">Dr. Markus Schmidberger</reporter>
                        <labels>
                    </labels>
                <created>Mon, 24 Feb 2014 14:28:38 +0000</created>
                <updated>Sun, 23 Mar 2014 23:00:54 +0000</updated>
                            <resolved>Sun, 23 Mar 2014 23:00:54 +0000</resolved>
                                    <version>2.5.5</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="519854" author="markus.schmidberger@comsysto.com" created="Thu, 20 Mar 2014 10:33:43 +0000"  >&lt;p&gt;Ok, we now use a consistent order of the subdocuments. You can close this issue.&lt;/p&gt;</comment>
                            <comment id="504144" author="eliot" created="Mon, 24 Feb 2014 16:21:13 +0000"  >&lt;p&gt;Is there a reason you can&apos;t use a consistent order for the subdocuments?&lt;br/&gt;
All drivers expose methods to do so.&lt;/p&gt;</comment>
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