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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-10454] Do not store field names with &quot;.&quot; in any metadata collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-10454</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If you shard a collection with a key like {{&lt;/p&gt;
{&quot;a.b&quot;:1}
&lt;p&gt;}} the system stores that as a field name in various collections (collections, chunks, changelog and tags to name a few). &lt;/p&gt;

&lt;p&gt;This causes problems with backing up and restoring data or moving data to other databases (since these fields are invalid as user documents). It also means that the clients/driver and server has to special case these collections (or database) to disable regular validation (hence the problem moving this data to user collections).&lt;/p&gt;

&lt;p&gt;This is somewhat related to trying to copy the profiler documents (which have fields with $prefix or dots) to different collections. &lt;/p&gt;</description>
                <environment></environment>
        <key id="85014">SERVER-10454</key>
            <summary>Do not store field names with &quot;.&quot; in any metadata collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>PM497</label>
                    </labels>
                <created>Wed, 7 Aug 2013 15:34:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:18:54 +0000</updated>
                            <resolved>Tue, 23 May 2017 19:28:03 +0000</resolved>
                                                                    <component>Sharding</component>
                    <component>Tools</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1578126" author="schwerin" created="Tue, 23 May 2017 19:28:03 +0000"  >&lt;p&gt;After consultation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt;, I don&apos;t believe it should be illegal to store fieldsnames containing dots. It just happens to be impossible to construct path expressions over them, which means you cannot index over them or query over them directly. Extensions to the query language could be added to allow for that, if it were desired. In the meantime, they seem safe to store.&lt;/p&gt;</comment>
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            <issuekey id="287069">SERVER-24174</issuekey>
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            <issuekey id="386191">SERVER-29334</issuekey>
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            <issuekey id="22782">SERVER-3943</issuekey>
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