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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-6852] Disallow empty path components in documents and queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-6852</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Empty string field names are allowed in json, and they are currently allowed in mongo documents.  However there are many places in mongo code where empty string field names are not supported correctly, often because the empty string is used as an internal sentinel value in the implementation of various features.&lt;/p&gt;

&lt;p&gt;In addition to the linked cases, here are some others:&lt;/p&gt;

&lt;p&gt;Projection of an empty string field has opposite of desired effect:&lt;/p&gt;
&lt;p/&gt;
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				&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;test.c&lt;/span&gt;&lt;/pre&gt;
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				&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;&amp;gt; c.drop();&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;   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;true&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&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;&amp;gt; c.save( { &apos;&apos;:&apos;foo&apos; } );&lt;/span&gt;&lt;/pre&gt;
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				&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;&amp;gt; c.find( {}, { &apos;&apos;: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;   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;{ &quot;_id&quot; : ObjectId(&quot;5037e1fd4764d2aca5d2cc35&quot;), &quot;&quot; : &quot;foo&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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; c.find( {}, { &apos;&apos;:1 } );&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;
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&lt;p/&gt;

&lt;p&gt;FieldPath doesn&apos;t allow empty string field names (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6592&quot; title=&quot;improve FieldPath validation behavior&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6592&quot;&gt;&lt;del&gt;SERVER-6592&lt;/del&gt;&lt;/a&gt;), I think there are a number of cases where the aggregation framework won&apos;t handle them.&lt;/p&gt;

&lt;p&gt;Once we decide what to do about empty string fields we should do an audit to ensure we correctly implement the desired behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="48087">SERVER-6852</key>
            <summary>Disallow empty path components in documents and queries</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Fri, 24 Aug 2012 20:29:39 +0000</created>
                <updated>Tue, 6 Dec 2022 05:30:04 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="518081" author="rassi@10gen.com" created="Tue, 18 Mar 2014 03:27:27 +0000"  >&lt;p&gt;Note that as of 2.5.5, ensureIndex({&quot;&quot;:1}) will return an error (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11812&quot; title=&quot;Can create indexes on invalid fields (empty, $** component)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11812&quot;&gt;&lt;del&gt;SERVER-11812&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="39717">SERVER-5944</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="22394">SERVER-3874</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="116899">SERVER-12996</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="119390">SERVER-13138</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="75420">SERVER-9693</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="223959">SERVER-19740</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="51521">SERVER-7174</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="99424">SERVER-11812</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="161669">SERVER-15516</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="223872">SERVER-19725</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1473786">COMPASS-4414</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="50150">SERVER-6999</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="13602">SERVER-2051</issuekey>
        </issuelink>
                            </inwardlinks>
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