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    <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-7316] Request to add &quot;Included Columns&quot; as an option for index types</title>
                <link>https://jira.mongodb.org/browse/SERVER-7316</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;SQL Server has the ability to include fields within an index definition that just tag along for the ride but are not used for indexing (sorting) purposes at all. This has a great benefit of turning an index into a covering index without extra sorting overhead if any of the values change. (see &lt;a href=&quot;http://msdn.microsoft.com/en-us/library/ms190806.aspx&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://msdn.microsoft.com/en-us/library/ms190806.aspx&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;In our case, we have an array of subdocuments that we need to validate using $elemMatch. Unfortunately, $elemMatch can&apos;t take advantage of indexes (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-964&quot; title=&quot;Get $elemMatch to correctly use the index on the array&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-964&quot;&gt;&lt;del&gt;SERVER-964&lt;/del&gt;&lt;/a&gt;). Even though this part of our query evaluates to true 99% of the time, we cannot denormalize it further. On really big queries, with large ntoskip values, Mongo has to do a table lookup for every record in the query, resulting in queries returning only 50 records taking over 1 minute.&lt;/p&gt;

&lt;p&gt;But if Mongo could &quot;include&quot; a snippet of the document on the leaf of every indexed item, the query would be able to be satisfied completely by the index and the same query would take seconds or milliseconds to complete.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="52831">SERVER-7316</key>
            <summary>Request to add &quot;Included Columns&quot; as an option for index types</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="william.zola@10gen.com">William Zola</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Oct 2012 19:27:10 +0000</created>
                <updated>Tue, 6 Dec 2022 05:28:42 +0000</updated>
                            <resolved>Mon, 4 Mar 2019 21:34:15 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
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