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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-6177] verify assertion when parent of an inclusion field is an operator expression</title>
                <link>https://jira.mongodb.org/browse/SERVER-6177</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;ExpressionObject::includePath expects that an existing expression encountered while traversing the supplied field path is an ExpressionObject.  But this will not be the case if an earlier expression on the field was a non object expression (it could be an operator expression).&lt;/p&gt;

&lt;p&gt;Current behavior: verify assertion in the case described above, and in the test&lt;br/&gt;
Expected behavior: uassert?&lt;/p&gt;

&lt;p/&gt;
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					&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;printjson( c.aggregate( { $project:{ &apos;x&apos;:{ $add:[ 1 ] }, &apos;x.b&apos;:1 } } ) );&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="42154">SERVER-6177</key>
            <summary>verify assertion when parent of an inclusion field is an operator expression</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Jun 2012 18:09:59 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:58 +0000</updated>
                            <resolved>Fri, 20 Jul 2012 23:00:49 +0000</resolved>
                                                    <fixVersion>2.2.0-rc1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="145601" author="auto" created="Fri, 20 Jul 2012 22:49:44 +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>
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