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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-5369] $project exclusion doubles _id field in console output</title>
                <link>https://jira.mongodb.org/browse/SERVER-5369</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&amp;gt; db.test.save(&lt;/p&gt;
{a:1,b:2}
&lt;p&gt;)&lt;br/&gt;
&amp;gt; db.test.save(&lt;/p&gt;
{a:3,b:4}
&lt;p&gt;)&lt;/p&gt;

&lt;p&gt;&amp;gt; db.test.find()&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;4f6ba4a90a07b1052bfdb5e0&quot;), &quot;a&quot; : 1, &quot;b&quot; : 2 }
{ &quot;_id&quot; : ObjectId(&quot;4f6ba4b40a07b1052bfdb5e1&quot;), &quot;a&quot; : 3, &quot;b&quot; : 4 }

&lt;p&gt;&amp;gt; db.test.aggregate({$project:{a:0}})&lt;br/&gt;
{&lt;br/&gt;
        &quot;result&quot; : [&lt;br/&gt;
                &lt;/p&gt;
{
                        &quot;_id&quot; : ObjectId(&quot;4f6ba4a90a07b1052bfdb5e0&quot;),
                        &quot;_id&quot; : ObjectId(&quot;4f6ba4a90a07b1052bfdb5e0&quot;),
                        &quot;b&quot; : 2
                }
&lt;p&gt;,&lt;/p&gt;
                {
                        &quot;_id&quot; : ObjectId(&quot;4f6ba4b40a07b1052bfdb5e1&quot;),
                        &quot;_id&quot; : ObjectId(&quot;4f6ba4b40a07b1052bfdb5e1&quot;),
                        &quot;b&quot; : 4
                }
&lt;p&gt;        ],&lt;br/&gt;
        &quot;ok&quot; : 1&lt;br/&gt;
}&lt;/p&gt;

&lt;p&gt;Repeated attribute is obviously not possible, so this seems very minor, but is a bit unexpected to see and object come back like this.&lt;/p&gt;</description>
                <environment>uname -a&lt;br/&gt;
Linux 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:48:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux&lt;br/&gt;
&lt;br/&gt;
&amp;gt; db.serverBuildInfo()&lt;br/&gt;
{&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;version&amp;quot; : &amp;quot;2.1.0&amp;quot;,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;gitVersion&amp;quot; : &amp;quot;d674c681170337e3dfc34ae796b06fdde5ac05dd&amp;quot;,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;sysInfo&amp;quot; : &amp;quot;Linux ip-10-110-9-236 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_41&amp;quot;,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;versionArray&amp;quot; : [&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;2,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;1,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;0,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;0&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;],&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;bits&amp;quot; : 64,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;debug&amp;quot; : false,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;maxBsonObjectSize&amp;quot; : 16777216,&lt;br/&gt;
&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;quot;ok&amp;quot; : 1&lt;br/&gt;
}&lt;br/&gt;
</environment>
        <key id="33585">SERVER-5369</key>
            <summary>$project exclusion doubles _id field in console output</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="cwestin">Chris Westin</assignee>
                                    <reporter username="crudson">Doug Hudson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Mar 2012 22:23:58 +0000</created>
                <updated>Mon, 11 Jul 2016 18:34:31 +0000</updated>
                            <resolved>Mon, 26 Mar 2012 16:52:48 +0000</resolved>
                                    <version>2.1.0</version>
                                    <fixVersion>2.1.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="145605" author="auto" created="Fri, 20 Jul 2012 22:49:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-14T12:04:12-07:00&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;}
&lt;p&gt;Message: Rewrite ExpressionObject&lt;/p&gt;

&lt;p&gt;The main difference between this version and the old is that the following&lt;br/&gt;
three $pipelines will produce the same output (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6468&quot; title=&quot;Treat nested and dotted projections the same&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6468&quot;&gt;&lt;del&gt;SERVER-6468&lt;/del&gt;&lt;/a&gt;):&lt;/p&gt;

{&apos;a.b&apos;: 1}
&lt;p&gt; // classic inclusion&lt;br/&gt;
{a: &lt;/p&gt;
{b: 1}
&lt;p&gt; // nested inclusion&lt;/p&gt;
{&apos;a.b&apos;: &apos;$a.b&apos;}
&lt;p&gt; // dotted FieldPathExpression&lt;br/&gt;
{a: &lt;/p&gt;
{b: &apos;$a.b&apos;}
&lt;p&gt; // nested FieldPathExpression&lt;/p&gt;

&lt;p&gt;Additionally support for exclusion of fields other than _id has been&lt;br/&gt;
removed for 2.2 (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6361&quot; title=&quot;Disallow exclusion in $project for now&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6361&quot;&gt;&lt;del&gt;SERVER-6361&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;Other related bugs:&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6177&quot; title=&quot;verify assertion when parent of an inclusion field is an operator expression&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6177&quot;&gt;&lt;del&gt;SERVER-6177&lt;/del&gt;&lt;/a&gt; better error for &lt;/p&gt;
{a:1, &apos;a.b&apos;:1}
&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6181&quot; title=&quot;attempt to $project a computed _id field results in a document with two duplicate (wrong) _id values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6181&quot;&gt;&lt;del&gt;SERVER-6181&lt;/del&gt;&lt;/a&gt; support for computed _id&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6184&quot; title=&quot;mixing nested and dotted $project ExpressionObjects produces inconsistent results and assertions in some cases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6184&quot;&gt;&lt;del&gt;SERVER-6184&lt;/del&gt;&lt;/a&gt; support {&apos;a.b&apos;: 1, a:{c:1}} in either order&lt;/p&gt;

&lt;p&gt;Remaining TODOs:&lt;br/&gt;
Re-enable the isSimple() method&lt;br/&gt;
See if this can be used more directly by $group to support nested fields (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6198&quot; title=&quot;$group aggregate field names can contain dots, may cause problems with sharding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6198&quot;&gt;&lt;del&gt;SERVER-6198&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;Disabled test for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5369&quot; title=&quot;$project exclusion doubles _id field in console output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5369&quot;&gt;&lt;del&gt;SERVER-5369&lt;/del&gt;&lt;/a&gt; because it depends on ability to exclude&lt;br/&gt;
arbitrary fields.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ec18db98680d31b120350ad45d5f74095125e9a5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ec18db98680d31b120350ad45d5f74095125e9a5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="140421" author="auto" created="Fri, 6 Jul 2012 17:50:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-05T13:14:33-07:00&apos;, u&apos;email&apos;: u&apos;dannenberg.matt@gmail.com&apos;, u&apos;name&apos;: u&apos;Matt Dannenberg&apos;}
&lt;p&gt;Message: fix &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5369&quot; title=&quot;$project exclusion doubles _id field in console output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5369&quot;&gt;&lt;del&gt;SERVER-5369&lt;/del&gt;&lt;/a&gt; test to actually test something&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e327b6788891bc4bcfe96459c01d8a4e784928f5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e327b6788891bc4bcfe96459c01d8a4e784928f5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="103640" author="auto" created="Mon, 26 Mar 2012 16:51:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;cwestin&apos;, u&apos;name&apos;: u&apos;U-tellus\\cwestin&apos;, u&apos;email&apos;: u&apos;cwestin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5369&quot; title=&quot;$project exclusion doubles _id field in console output&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5369&quot;&gt;&lt;del&gt;SERVER-5369&lt;/del&gt;&lt;/a&gt; don&apos;t show _id twice for exclusionary mode&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2bd824ce85427664a68913df01cb8ea2c6bdf93a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2bd824ce85427664a68913df01cb8ea2c6bdf93a&lt;/a&gt;&lt;/p&gt;</comment>
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