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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-63840] mqlrun yields inconsistent with mongod when field name is empty</title>
                <link>https://jira.mongodb.org/browse/SERVER-63840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The empty string (&quot;&quot;) is a valid field name in MongoDB and a user can query off of it using a match pipeline stage when running on a mongod. However, if a document is passed to mqlrun with the empty string as a field name, then that field is effectively ignored, rather than queried off of.&lt;/p&gt;

&lt;p&gt;This was discovered while investigating a fix for MHOUSE-3552.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1986514">SERVER-63840</key>
            <summary>mqlrun yields inconsistent with mongod when field name is empty</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="shakil.rafi@mongodb.com">Shakil Rafi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Feb 2022 17:45:16 +0000</created>
                <updated>Tue, 6 Dec 2022 00:30:15 +0000</updated>
                            <resolved>Tue, 1 Mar 2022 16:26:31 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4383677" author="JIRAUSER1257467" created="Tue, 1 Mar 2022 16:26:31 +0000"  >&lt;p&gt;As discussed in Query Triage we will not be prioritizing this change in behavior&#160;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="361432" name="empty_field_names.bson" size="34" author="shakil.rafi@mongodb.com" created="Fri, 18 Feb 2022 17:43:24 +0000"/>
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                            <customfieldvalue>&lt;p&gt;&lt;tt&gt;$ ./mqlrun -j -e &apos;[]&apos; empty_field_names.bson # this bson file is attached&lt;/tt&gt;&lt;/p&gt;

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&lt;p&gt;{ : 1 }&lt;br/&gt;
 { : 2 }&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;$ ./mqlrun -j -e &apos;[{$match: {&quot;&quot;:1&lt;/tt&gt;}}]&apos; empty_field_names.bson # no results&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;$ ./mqlrun -j -e &apos;[{$match: {&quot;a&quot;:1&lt;/tt&gt;}}]&apos; empty_field_names.bson&lt;/p&gt;

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