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    <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-6650] should matcher prevent use of $ prefixed field names?</title>
                <link>https://jira.mongodb.org/browse/SERVER-6650</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now if someone attempts to use an aggregation expression inside a query or inside a $match, they will see results different from what they expect (and no error):&lt;/p&gt;

&lt;p/&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;t.save( { a:1, b:5 } );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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( t.find( { a:1, b:{ $gt:{ $add:[ 1, 1 ] } } } ).toArray() );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;printjson( t.aggregate( { $match:{ a:1, b:{ $gt:{ $add:[ 1, 1 ] } } } } ) );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;In both cases &lt;/p&gt;
{ $add:[ 1, 1 ] }
&lt;p&gt; is treated as a document to compare against, not an expression to be evaluated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="45812">SERVER-6650</key>
            <summary>should matcher prevent use of $ prefixed field names?</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="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jul 2012 22:09:38 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:02 +0000</updated>
                            <resolved>Sun, 16 Jun 2013 16:02:25 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="157276" author="redbeard0531" created="Mon, 27 Aug 2012 23:32:43 +0000"  >&lt;p&gt;Moving from Agg framework to Querying because this deals with the general Matcher class, not an agg specific version.&lt;/p&gt;</comment>
                            <comment id="156542" author="auto" created="Fri, 24 Aug 2012 19:51:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-08-02T13:35:55-07:00&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6650&quot; title=&quot;should matcher prevent use of $ prefixed field names?&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6650&quot;&gt;&lt;del&gt;SERVER-6650&lt;/del&gt;&lt;/a&gt; label test cases.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/258fb29b0d22dd49afb8a294ec0d26088b2ad186&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/258fb29b0d22dd49afb8a294ec0d26088b2ad186&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="148890" author="aaron" created="Mon, 30 Jul 2012 22:20:02 +0000"  >&lt;p&gt;Scheduled in rc1 for triage.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="30651">SERVER-4973</issuekey>
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