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    <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-62689] Support index on _id with different collation for clustered collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-62689</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61260&quot; title=&quot;Support collations on clustered collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61260&quot;&gt;&lt;del&gt;SERVER-61260&lt;/del&gt;&lt;/a&gt; added support for collations to clustered collections. Sharding requires an index with &lt;tt&gt;collation = simple&lt;/tt&gt; on the shard key, if we want to shard on &lt;tt&gt;_id&lt;/tt&gt; we&apos;d need to create an explicit index on &lt;tt&gt;_id&lt;/tt&gt; with the simple collation, but currently that&apos;s not possible:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Indexes on _id must have the collection default collation: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62dcce62e7be38f9637cdd967070713ebfa6aaa5/src/mongo/db/catalog/index_catalog_impl.cpp#L857-L862&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/62dcce62e7be38f9637cdd967070713ebfa6aaa5/src/mongo/db/catalog/index_catalog_impl.cpp#L857-L862&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;It&apos;s not possible to create an index that matches the cluster key: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62dcce62e7be38f9637cdd967070713ebfa6aaa5/src/mongo/db/catalog/index_catalog_impl.cpp#L829-L833&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/62dcce62e7be38f9637cdd967070713ebfa6aaa5/src/mongo/db/catalog/index_catalog_impl.cpp#L829-L833&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Some of these restrictions were introduced by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26724&quot; title=&quot;createIndexes command should reject invalid options for _id index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26724&quot;&gt;&lt;del&gt;SERVER-26724&lt;/del&gt;&lt;/a&gt; to protect _id index creation when using &lt;tt&gt;autoIndexId: false&lt;/tt&gt;, which is no longer supported. I think it should be OK to relax some of these restrictions, at the very least for clustered collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1965138">SERVER-62689</key>
            <summary>Support index on _id with different collation for clustered collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="daniel.gomezferro@mongodb.com">Daniel Gomez Ferro</reporter>
                        <labels>
                            <label>clustered_collections</label>
                    </labels>
                <created>Mon, 17 Jan 2022 11:12:43 +0000</created>
                <updated>Mon, 22 May 2023 18:50:36 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                    <issuelinks>
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            <issuekey id="1965133">SERVER-62688</issuekey>
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