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    <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-43840] Exclusion projection parser invariant trips on attempt to exclude reserved $-prefixed reserved field name</title>
                <link>https://jira.mongodb.org/browse/SERVER-43840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In previous versions of the server, all $-prefixed path components were disallowed in the aggregation framework and, in particular, were disallowed in exclusion projections. As part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42421&quot; title=&quot;Plug in BSON -&amp;gt; ProjectionAST parser to find command path&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42421&quot;&gt;&lt;del&gt;SERVER-42421&lt;/del&gt;&lt;/a&gt;, however, we introduced several reserved $-prefixed key names which are legal. These include &quot;$ref&quot;, &quot;$db&quot;, and &quot;$id&quot;, which constitute DBRefs, as well as names used by the system internally to store metadata such as &quot;$recordId&quot;, &quot;$sortKey&quot;, and so on.&lt;/p&gt;

&lt;p&gt;There is a lingering &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b35dd89515473c97a87b3c06897e8a7ab51c93cc/src/mongo/db/pipeline/parsed_exclusion_projection.cpp#L59-L60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant in the exclusion projection parser&lt;/a&gt; which expects that the caller has rejected &lt;em&gt;all&lt;/em&gt; $-prefixed field names. This invariant is no longer correct, since we permit certain reserved $-prefixed names as described above. We should remove or relax this incorrect invariant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="959846">SERVER-43840</key>
            <summary>Exclusion projection parser invariant trips on attempt to exclude reserved $-prefixed reserved field name</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="13201">Fixed</resolution>
                                        <assignee username="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Oct 2019 17:40:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:25 +0000</updated>
                            <resolved>Wed, 23 Oct 2019 15:48:59 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2497589" author="xgen-internal-githook" created="Wed, 23 Oct 2019 15:15:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;, &apos;email&apos;: &apos;ian.boros@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43840&quot; title=&quot;Exclusion projection parser invariant trips on attempt to exclude reserved $-prefixed reserved field name&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43840&quot;&gt;&lt;del&gt;SERVER-43840&lt;/del&gt;&lt;/a&gt; fix invariant failure in exclusion projection parser&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/35fbf9bc919f0645b1269cd9916ce2509617e072&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/35fbf9bc919f0645b1269cd9916ce2509617e072&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2466972" author="david.storch" created="Fri, 4 Oct 2019 17:43:22 +0000"  >&lt;p&gt;This was introduced in 4.3 development and therefore does not affect any stable branches, including 4.2.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Any attempt to exclude one of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b35dd89515473c97a87b3c06897e8a7ab51c93cc/src/mongo/db/pipeline/field_path.cpp#L42-L62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;allowed $-prefixed path components&lt;/a&gt; will trigger this invariant:&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;&amp;gt; db.c.aggregate([{$unset: &quot;$db&quot;}])&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 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;&amp;gt; db.c.aggregate([{$project: {$ref: 0}}])&lt;/span&gt;&lt;/pre&gt;
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						&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-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;&amp;gt; db.c.aggregate([{$project: {&quot;$textScore&quot;: 0}}])&lt;/span&gt;&lt;/pre&gt;
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