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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-5878] Allow hashed indexes to be unique</title>
                <link>https://jira.mongodb.org/browse/SERVER-5878</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently hashed indexes are not allowed to be unique (due to potential hash collisions on the keys). Uniqueness can be enforced on a field if a non-hashed index is created on the same field, but this is inefficient.  &lt;/p&gt;

&lt;p&gt;It should be possible to create a unique hashed index by checking for a match on the actual document (not just on the key in the index) before insertion.&lt;/p&gt;</description>
                <environment></environment>
        <key id="39141">SERVER-5878</key>
            <summary>Allow hashed indexes to be unique</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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="matulef">Kevin Matulef</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 May 2012 21:19:27 +0000</created>
                <updated>Tue, 6 Dec 2022 05:33:16 +0000</updated>
                                            <version>2.1.2</version>
                                                    <component>Index Maintenance</component>
                                        <votes>14</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="2123653" author="asya" created="Tue, 22 Jan 2019 23:59:20 +0000"  >&lt;p&gt;It&apos;s not clear whether this is something that can be done.  Flagging for discussion at needs triage.&lt;/p&gt;</comment>
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