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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-82079] Count clustered index scan as indexScan and not collectionScan in $lookup explain output</title>
                <link>https://jira.mongodb.org/browse/SERVER-82079</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Based on this community post: &lt;a href=&quot;https://www.mongodb.com/community/forums/t/clustered-collections-as-lookup-target/246893&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/community/forums/t/clustered-collections-as-lookup-target/246893&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The user is worried we are not using clustered index, because in explain output for $lookup they see a lot of collectionScans and no indexes used.&lt;/p&gt;

&lt;p&gt;It happens because internally clustered index scan is a collection scan and not an index scan.&lt;/p&gt;

&lt;p&gt;We should improve explain output by showing explicitly that clustered index is used.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2471701">SERVER-82079</key>
            <summary>Count clustered index scan as indexScan and not collectionScan in $lookup explain output</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="tarun.gaur@mongodb.com">Tarun Gaur</reporter>
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                <created>Wed, 11 Oct 2023 14:37:31 +0000</created>
                <updated>Tue, 14 Nov 2023 19:55:37 +0000</updated>
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