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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-42390] Allow documents in a sharded collection to not contain all shard key fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-42390</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As described in &lt;a href=&quot;https://docs.google.com/document/d/1X91kPudrOog7sQsrxB7GXTiRe66B4yUSx4rLj5HKvfY/edit#heading=h.9s7f7wj6a96b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this section of the design document&lt;/a&gt;, change shard key value extraction for orphan filtering to treat missing shard key fields as null values (like an index) to allow documents in a sharded collection to not contain every field in the shard key. (Previously such documents were considered orphaned and always filtered out of sharded query results.)&lt;/p&gt;

&lt;p&gt;In addition to updating shard key extraction for filtering, the rules for targeting queries should be updated as described in the design document section linked above. All checks used to enforce documents contain the full shard key can be removed (like the &lt;tt&gt;checkShardingIndex&lt;/tt&gt; command).&lt;/p&gt;

&lt;p&gt;When this ticket is completed, the generated docs ticket should include the need to document that after a downgrade any documents missing a shard key field will become orphaned.&lt;/p&gt;</description>
                <environment></environment>
        <key id="874541">SERVER-42390</key>
            <summary>Allow documents in a sharded collection to not contain all shard key fields</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="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="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jul 2019 19:09:44 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:48 +0000</updated>
                            <resolved>Tue, 24 Sep 2019 17:14:17 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2431438" author="xgen-internal-githook" created="Tue, 24 Sep 2019 17:09:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;del&gt;SERVER-42390&lt;/del&gt;&lt;/a&gt; Change search beta test to reflect relaxed constraints on missing shard key fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/c28fec04ba65ecf45a8755c03c5a9b63e3e41c04&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/c28fec04ba65ecf45a8755c03c5a9b63e3e41c04&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2430992" author="xgen-internal-githook" created="Tue, 24 Sep 2019 15:38:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;del&gt;SERVER-42390&lt;/del&gt;&lt;/a&gt; Allow documents in a sharded collection to not contain all shard key fields&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2f5feed026e1c22bce29cf2efe746d55879d4a14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2f5feed026e1c22bce29cf2efe746d55879d4a14&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="987830">SERVER-44382</issuekey>
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                            <customfieldvalue>Missing shard key fields will now be treated the same as a null value for that field. For the specific details and nuances, refer to this section of the refine collection shard key technical design.&lt;br/&gt;
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