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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47657] Add &apos;unique&apos; and &apos;sparse&apos; parameters to index signature</title>
                <link>https://jira.mongodb.org/browse/SERVER-47657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;At present, an index&apos;s signature - that is, the combination of parameters which uniquely identify the index - is defined by its keypattern and collation. No index can be created if its signature is equivalent to an existing index. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25023&quot; title=&quot;no way to index the same fields with two different partial index filters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25023&quot;&gt;&lt;del&gt;SERVER-25023&lt;/del&gt;&lt;/a&gt; seeks to add the &lt;tt&gt;partialFilterExpression&lt;/tt&gt; parameter to this list, such that multiple partial indexes could be built on the same fields so long as their filters are different.&lt;/p&gt;

&lt;p&gt;We should also add the &lt;tt&gt;unique&lt;/tt&gt; and &lt;tt&gt;sparse&lt;/tt&gt; parameters to the index signature. At present, it is not possible to build a sparse index on a particular key pattern if an existing non-sparse index is already present. Users who wish to move from a full index to a sparse index have little option but to drop the existing index before building the sparse version. A similar situation exists for users who wish to introduce a uniqueness constraint on a field which is already indexed. Workarounds do exist in these situations, but they are ugly and more labour-intensive than should be necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1321726">SERVER-47657</key>
            <summary>Add &apos;unique&apos; and &apos;sparse&apos; parameters to index signature</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="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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Mon, 20 Apr 2020 14:45:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:09:16 +0000</updated>
                            <resolved>Wed, 3 Mar 2021 03:18:47 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="3643554" author="xgen-internal-githook" created="Wed, 3 Mar 2021 02:55:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47657&quot; title=&quot;Add &amp;#39;unique&amp;#39; and &amp;#39;sparse&amp;#39; parameters to index signature&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47657&quot;&gt;&lt;del&gt;SERVER-47657&lt;/del&gt;&lt;/a&gt; Added unique and sparse to index signature&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8865b969a8ccd01311e7bf3678bdf3453c92d338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8865b969a8ccd01311e7bf3678bdf3453c92d338&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is documented by">
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            <issuekey id="1644865">DOCS-14277</issuekey>
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            <issuekey id="1963819">SERVER-62636</issuekey>
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            <issuelink>
            <issuekey id="1328464">SERVER-47766</issuekey>
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            <issuelink>
            <issuekey id="1322111">SERVER-47659</issuekey>
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            <issuekey id="300613">SERVER-25023</issuekey>
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                            <customfieldvalue>unique/sparse index options are now part of index signature.&lt;br/&gt;
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If there&amp;#39;s any artifacts which are aware that unique/sparse index options are not part of index signature, probably it need to be modified.</customfieldvalue>

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