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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-69867] Do not use sparse or partial index to calculate cardinality and frequency of a shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-69867</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using a sparse or partial index can cause the aggregation command to return the wrong cardinality and frequency since:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Sparse indexes omit documents that have null/missing index key fields.&lt;/li&gt;
	&lt;li&gt;Partial indexes omit documents that do not match the specified filter.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;A shard key index can never be sparse or partial so this requirement only affects the candidate key case.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2142593">SERVER-69867</key>
            <summary>Do not use sparse or partial index to calculate cardinality and frequency of a shard key</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Sep 2022 17:10:47 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:59 +0000</updated>
                            <resolved>Tue, 4 Oct 2022 14:17:58 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4875152" author="xgen-internal-githook" created="Tue, 4 Oct 2022 01:33:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69867&quot; title=&quot;Do not use sparse or partial index to calculate cardinality and frequency of a shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69867&quot;&gt;&lt;del&gt;SERVER-69867&lt;/del&gt;&lt;/a&gt; Do not use sparse or partial index to calculate cardinality and frequency of a shard key&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d1284a62a9d371ddab43216d396a4c392625eff&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d1284a62a9d371ddab43216d396a4c392625eff&lt;/a&gt;&lt;/p&gt;</comment>
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