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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-11965] Allow compound indexes using single elements from multiple arrays</title>
                <link>https://jira.mongodb.org/browse/SERVER-11965</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB currently disallows compound indexes whose components are single array elements selected by position from multiple arrays. &lt;/p&gt;

&lt;p&gt;However, MongoDB does allow compound indexes whose components are single array elements selected by position from a single array. Furthermore, the resulting index is not multiKey.&lt;/p&gt;

&lt;p&gt;Given that neither of these indexes should be multiKey, the check for multiple arrays at &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r2.4.8/src/mongo/db/indexkey.cpp#L232&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r2.4.8/src/mongo/db/indexkey.cpp#L232&lt;/a&gt; may be a little too restrictive.&lt;/p&gt;</description>
                <environment></environment>
        <key id="101190">SERVER-11965</key>
            <summary>Allow compound indexes using single elements from multiple arrays</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="norman.graham@mongodb.com">Norman Graham</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Thu, 5 Dec 2013 02:00:34 +0000</created>
                <updated>Mon, 9 Jan 2023 19:02:13 +0000</updated>
                                                                            <component>Index Maintenance</component>
                                        <votes>2</votes>
                                    <watches>8</watches>
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