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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>[DOCS-15965] [Server] Allow wildcard indexes to be compounded with preceding fields</title>
                <link>https://jira.mongodb.org/browse/DOCS-15965</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    Enable users to create compound wildcard indexes(CWI) like &lt;/p&gt;
{region: 1, &#8230;, &quot;attributes.$**&quot;: 1}
&lt;p&gt; which combines a wildcard field with regular fields.&lt;/p&gt;

&lt;p&gt;Please see more details here &lt;a href=&quot;https://jira.mongodb.org/browse/PM-1646&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/PM-1646&lt;/a&gt; and the scope doc: &lt;a href=&quot;https://docs.google.com/document/d/1Njw8ZzyapcUMqZNUUpaSyAqBJx2wxKlNoibAN4Fq5v0/edit#heading=h.sye21yee6q34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1Njw8ZzyapcUMqZNUUpaSyAqBJx2wxKlNoibAN4Fq5v0/edit#heading=h.sye21yee6q34&lt;/a&gt;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    &lt;a href=&quot;https://docs.mongodb.com/master/core/index-wildcard/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Wildcard Indexes&lt;/a&gt; currently do not support compounding in any fashion. Given the way they are implemented, it seems logical that no additional compound field should follow the wildcard part. However, a preceding compound field should not violate the premises of wildcard indexing and would support additional use cases.&lt;/p&gt;

&lt;p&gt;Consider a collection containing polymorphic documents that share a common &quot;type&quot; field but may otherwise contain varying content fields...&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;In such cases, many queries will want to match documents based on a content field, but only within a given target type. Hence it would be preferable to create the following index:&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;Which is currently not permitted and will be answered with a generic &quot;wildcard indexes do not allow compounding&quot; error message.&lt;/p&gt;

&lt;p&gt;MongoDB currently scales better with few large collections and few indexes than it does with many small collections and many indexes (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-5479&quot; title=&quot;Checkpoint schema lock can cause long stalls in command execution on systems with many active data handles&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-5479&quot;&gt;&lt;del&gt;WT-5479&lt;/del&gt;&lt;/a&gt;). Given that one of the major advantages of MongoDB is that it is schema-free, building polymorphic collections seems like the natural way to go. More flexible wildcard indexes could provide key support in this regard.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2292207">DOCS-15965</key>
            <summary>[Server] Allow wildcard indexes to be compounded with preceding fields</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="dave.cuthbert@mongodb.com">Dave Cuthbert</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Mon, 20 Mar 2023 09:42:56 +0000</created>
                <updated>Mon, 13 Nov 2023 17:34:49 +0000</updated>
                            <resolved>Wed, 21 Jun 2023 17:09:48 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
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                            <customfieldvalue>Enable users to create compound wildcard indexes(CWI) like {region: 1, &#8230;, &amp;quot;attributes.$**&amp;quot;: 1} which combines a wildcard field with regular fields.&lt;br/&gt;
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