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    <title>MongoDB Jira</title>
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    <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-48570] Allow wildcard indexes to be compounded with preceding fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-48570</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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. A preceding compound field 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="1370909">SERVER-48570</key>
            <summary>Allow wildcard indexes to be compounded with preceding fields</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="ruoxin.xu@mongodb.com">Ruoxin Xu</assignee>
                                    <reporter username="ralf.strobel">Ralf Strobel</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Jun 2020 16:26:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:28 +0000</updated>
                            <resolved>Mon, 20 Mar 2023 09:42:54 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                    <component>Index Maintenance</component>
                                        <votes>15</votes>
                                    <watches>28</watches>
                                                                                                                <comments>
                            <comment id="5295977" author="ruoxin.xu" created="Thu, 23 Mar 2023 15:50:29 +0000"  >&lt;p&gt;Hi all! This new feature has been implemented and will be delivered in 7.0. In 7.0, we can compound the wildcard field with other regular fields to create a compound wildcard index. The wildcard field can be in an arbitrary position in the key pattern, for examples,&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;{&#8220;attributes.$**&#8221;: 1, tenantId:1, name: 1}&lt;/li&gt;
	&lt;li&gt;{tenantId:1, &#8220;attributes.$**&#8221;: 1, name: 1}&lt;/li&gt;
	&lt;li&gt;{tenantId:1, name: 1, &#8220;attributes.$**&#8221;: 1}&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The option, &#8216;wildcardProjection&#8217;, supported in the regular/single-field wildcard index is still supported in a compound wildcard index. We also extend wildcard indexes to support specifying either ascending or descending sort order of any field in a (compound) wildcard index.&lt;/p&gt;</comment>
                            <comment id="4809264" author="kateryna.kamenieva" created="Wed, 7 Sep 2022 19:12:22 +0000"  >&lt;p&gt;Thanks to everyone for adding their votes and comments. This item is on the roadmap, but there is no target release date to share yet.&lt;/p&gt;</comment>
                            <comment id="4809148" author="JIRAUSER1271033" created="Wed, 7 Sep 2022 18:35:02 +0000"  >&lt;p&gt;&#160;Are there any plans to resolve this in the near future?&lt;/p&gt;</comment>
                            <comment id="4074451" author="paul.robinson@akerolabs.com" created="Tue, 21 Sep 2021 15:01:06 +0000"  >&lt;p&gt;We really need this at our company. I wouldn&apos;t mind if it just offered 1 extra field, that could be an improvement just by itself.&lt;/p&gt;</comment>
                            <comment id="3479481" author="JIRAUSER1257530" created="Fri, 6 Nov 2020 14:54:43 +0000"  >&lt;p&gt;This is required for any SaaS using MongoDB with a multi-tenant architecture and dynamic schema features. Really looking forward for this one. Thanks!&lt;/p&gt;</comment>
                            <comment id="3202593" author="ralf.strobel" created="Wed, 10 Jun 2020 10:22:49 +0000"  >&lt;p&gt;I will definitely give you some credit for coming up with this solution. But yeah, it is a workaround (to avoid the word &quot;hack&quot;). This does not seem like a way I would actually like to re-schematize all of our customer databases.&lt;/p&gt;

&lt;p&gt;Your solution might be workable in the situation with distinct tenants. But I intentionally used the word &quot;polymorphism&quot;, as in there may actually be a complex system of types and subtypes or (traits), where some types may share certain fields while others don&apos;t. And yeah then you could go ahead and use explicit $or-Queries whenever you want a multi-type query and then pick the right sub-document from each result etc. But there it gets very messy very quick.&lt;/p&gt;

&lt;p&gt;So no, my feature request still stands. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="3197402" author="asya" created="Tue, 9 Jun 2020 15:43:30 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ralf.strobel&quot; class=&quot;user-hover&quot; rel=&quot;ralf.strobel&quot;&gt;ralf.strobel&lt;/a&gt;&#160;note that there is a workaround for cases where you want a leading field (like type or tenant id) before the wildcard subdocument index, it&apos;s described here:&#160;&lt;a href=&quot;https://www.mongodb.com/blog/post/wildcard-indexes-and-multitenant-deployments&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/blog/post/wildcard-indexes-and-multitenant-deployments&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;You can use a similar approach by making type a key name of the subdocument &lt;tt&gt;content&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3196573" author="ralf.strobel" created="Tue, 9 Jun 2020 07:11:05 +0000"  >&lt;p&gt;I just stumbled upon &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28743&quot; title=&quot;Make all WT cursor uses of keys --groupCollections aware.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28743&quot;&gt;&lt;del&gt;SERVER-28743&lt;/del&gt;&lt;/a&gt;, which effectively does something quite similar on a deeper storage level. Are there still plans to roll out this alternate storage mode and is it already compatible with wildcard indexes?&lt;/p&gt;</comment>
                            <comment id="3194987" author="carl.champain" created="Mon, 8 Jun 2020 15:08:22 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ralf.strobel&quot; class=&quot;user-hover&quot; rel=&quot;ralf.strobel&quot;&gt;ralf.strobel&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. &lt;br/&gt;
We&apos;re passing this ticket along to the appropriate team for additional investigation. Updates will be posted on this ticket as they happen.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Carl&lt;/p&gt;</comment>
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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;
&lt;br/&gt;
Please see more details here &lt;a href=&quot;https://jira.mongodb.org/browse/PM-1646&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;&gt;https://docs.google.com/document/d/1Njw8ZzyapcUMqZNUUpaSyAqBJx2wxKlNoibAN4Fq5v0/edit#heading=h.sye21yee6q34&lt;/a&gt;</customfieldvalue>

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