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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-3981] Creating a compound sparse index should uassert</title>
                <link>https://jira.mongodb.org/browse/SERVER-3981</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It looks like there&apos;s a uassert in indexkey.cpp, but it isn&apos;t correct.  I think it should be:&lt;/p&gt;

&lt;p&gt;uassert( 13529 , &quot;sparse only works for single field keys&quot; , ! _sparse || _nFields == 1 );&lt;/p&gt;

&lt;p&gt;Example:&lt;/p&gt;

&lt;p&gt;admin&amp;gt; db.foo.ensureIndex(&lt;/p&gt;
{x:1,y:1}
&lt;p&gt;, &lt;/p&gt;
{sparse:true,unique:true}
&lt;p&gt;)&lt;br/&gt;
admin&amp;gt; db.foo.getIndexes()&lt;br/&gt;
[&lt;br/&gt;
        {&lt;br/&gt;
                &quot;v&quot; : 1,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;_id&quot; : 1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;ns&quot; : &quot;admin.foo&quot;,&lt;br/&gt;
                &quot;name&quot; : &quot;&lt;em&gt;id&lt;/em&gt;&quot;&lt;br/&gt;
        },&lt;br/&gt;
        {&lt;br/&gt;
                &quot;v&quot; : 1,&lt;br/&gt;
                &quot;key&quot; : &lt;/p&gt;
{
                        &quot;x&quot; : 1,
                        &quot;y&quot; : 1
                }
&lt;p&gt;,&lt;br/&gt;
                &quot;unique&quot; : true,&lt;br/&gt;
                &quot;ns&quot; : &quot;admin.foo&quot;,&lt;br/&gt;
                &quot;name&quot; : &quot;x_1_y_1&quot;,&lt;br/&gt;
                &quot;sparse&quot; : true&lt;br/&gt;
        }&lt;br/&gt;
]&lt;/p&gt;</description>
                <environment></environment>
        <key id="23068">SERVER-3981</key>
            <summary>Creating a compound sparse index should uassert</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="kristina">Kristina Chodorow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Sep 2011 14:02:52 +0000</created>
                <updated>Wed, 10 Dec 2014 23:19:27 +0000</updated>
                            <resolved>Thu, 15 Aug 2013 19:42:42 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="404078" author="renctan" created="Thu, 15 Aug 2013 19:42:30 +0000"  >&lt;p&gt;Current master branch allows compound sparse index (although it may not fit some other use cases - see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10403&quot; title=&quot;sparse compound index should really be sparse&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10403&quot;&gt;&lt;del&gt;SERVER-10403&lt;/del&gt;&lt;/a&gt;). The assert was also removed from the code.&lt;/p&gt;</comment>
                            <comment id="58047" author="eliot" created="Sat, 1 Oct 2011 07:26:44 +0000"  >&lt;p&gt;multi key sparse indexes do work&lt;br/&gt;
may just be a doc bug and need to remove assert&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="84364">SERVER-10403</issuekey>
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