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    <title>MongoDB Jira</title>
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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>[DOCS-15993] [Server] Clarify whether &quot;.&quot; in shard key is used for nested doc reference or field name literal</title>
                <link>https://jira.mongodb.org/browse/DOCS-15993</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;If I perform the following operation:&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;   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;sh.shardCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;my_namespace&quot;&lt;/span&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;, { &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;my.field.name&quot;&lt;/span&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;: &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&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; })&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;It is not clear whether the dots (&apos;.&apos;) in &quot;my.field.name&quot; will be interpreted by the server for nested document path traversal (e.g. { my: { field: &lt;/p&gt;
{ name: &quot;abc&quot; }
&lt;p&gt; } }), or for the literal field name as per &lt;a href=&quot;https://www.mongodb.com/docs/v5.2/core/dot-dollar-considerations/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dot-dollar functionality&lt;/a&gt;. (The dot-dollar page does state that leading $ cannot be used in shard key names, but is ambiguous about dot.)&lt;/p&gt;

&lt;p&gt;Please kindly clarify this in the documentation; it would be good to put a note both on the shard page and the dot-dollar page.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2300247">DOCS-15993</key>
            <summary>[Server] Clarify whether &quot;.&quot; in shard key is used for nested doc reference or field name literal</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="-1">Unassigned</assignee>
                                    <reporter username="shields@tablecheck.com">Johnny Shields</reporter>
                        <labels>
                            <label>backlog</label>
                            <label>proactive</label>
                            <label>sharding</label>
                    </labels>
                <created>Tue, 28 Mar 2023 19:06:49 +0000</created>
                <updated>Mon, 22 Jan 2024 15:55:29 +0000</updated>
                                                                            <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5344299" author="JIRAUSER1264464" created="Thu, 13 Apr 2023 13:50:08 +0000"  >&lt;p&gt;Seems like a good idea to clarify whether all the restrictions listed under &quot;General Restrictions&quot; also apply to dot fields.&lt;/p&gt;</comment>
                            <comment id="5343053" author="william.tan" created="Wed, 12 Apr 2023 23:12:16 +0000"  >&lt;p&gt;Hi team, I have reverted to the customer my answer and he has requested that I post the answer here.&#160; Please comment where necessary.&lt;/p&gt;

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

&lt;p&gt;&quot;that . means embedded field and there is no way to make a field with literal . be the shard key, not could it be indexed.&quot;&lt;/p&gt;</comment>
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