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            <title>[SERVER-51459] Allow creation of index based on secondary fields of existing compound index</title>
                <link>https://jira.mongodb.org/browse/SERVER-51459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For example, using an existing index on {a:1, b:1}, support creating a new index on {b:1} or {b:1} with partialFilterExpression on &apos;a&apos;. &lt;/p&gt;

&lt;p&gt;From &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36202&quot; title=&quot;when creating new index, use existing index if possible to avoid collection scan&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36202&quot;&gt;&lt;del&gt;SERVER-36202&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;This might be an improvement. We would still need to sort the keys for &apos;b&apos;. We wouldn&apos;t need to scan the collection to generate keys, but we would need scan the index to generate new keys. This improvement would have to come from avoiding key generation from BSON to KeyString, which is very highly optimized. We would have to show that key generation from an existing KeyString(a,b) -&amp;gt; KeyString(b) is significantly faster than BSON -&amp;gt; KeyString.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;In addition, this should also have a smaller memory footprint by avoiding the need to page in full documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1509001">SERVER-51459</key>
            <summary>Allow creation of index based on secondary fields of existing compound index</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
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                <created>Fri, 9 Oct 2020 17:03:42 +0000</created>
                <updated>Tue, 6 Dec 2022 02:06:21 +0000</updated>
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