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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-2366] Speed up creation of (don&apos;t populate) index on unused field for sparse index</title>
                <link>https://jira.mongodb.org/browse/SERVER-2366</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This would help when schemas change and a user needs to start using another field within a collection. The user would create an index on the new field, and instead of uselessly having to scan through every document, index creation would happen immediately.&lt;/p&gt;

&lt;p&gt;If collections kept track of which fields were in use, index creation for an unused could just be empty instead of having to check every document.&lt;/p&gt;

&lt;p&gt;Even if collections don&apos;t keep track of exact fields, they can use a bloom filter to approximately keep track.&lt;/p&gt;

&lt;p&gt;Finally, there should be an option to ensureIndex() that instantaneously creates an empty index instead of scanning through every document when the user is confident the collection does not contain documents that contain the field. The option can be &lt;/p&gt;
{empty:true}
&lt;p&gt; or &lt;/p&gt;
{populate:false}
&lt;p&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="14232">SERVER-2366</key>
            <summary>Speed up creation of (don&apos;t populate) index on unused field for sparse index</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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-query">Backlog - Query Team</assignee>
                                    <reporter username="dlee">David Lee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Jan 2011 10:36:25 +0000</created>
                <updated>Tue, 6 Dec 2022 05:46:03 +0000</updated>
                            <resolved>Fri, 8 Dec 2017 15:40:42 +0000</resolved>
                                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="138638" author="gmacon" created="Mon, 2 Jul 2012 15:35:26 +0000"  >&lt;p&gt;I am planning to use Ming to enforce a schema on my database.  Because of this, I will have application-level knowledge that a certain field does not exist on any of the documents currently in the database and the database will not need to keep track of what fields exist.  The option should be documented with a caveat to the effect that if you don&apos;t &lt;em&gt;know&lt;/em&gt; that the field doesn&apos;t exist, don&apos;t use this option.&lt;/p&gt;</comment>
                            <comment id="22461" author="dlee" created="Mon, 17 Jan 2011 22:24:36 +0000"  >&lt;p&gt;That&apos;s fine. That&apos;s the reason I proposed the explicit option to ensureIndex which allows users to create an initially empty index.&lt;/p&gt;</comment>
                            <comment id="22450" author="eliot" created="Mon, 17 Jan 2011 17:09:40 +0000"  >&lt;p&gt;These requires keeping meta data that I&apos;m not sure we want to start keeping.&lt;/p&gt;</comment>
                            <comment id="22443" author="dlee" created="Mon, 17 Jan 2011 11:53:44 +0000"  >&lt;p&gt;I forgot to mention that this would only work for sparse indexes without changing index behavior. I guess somebody could also want an empty non-sparse index, but that would behave differently from normal indexes and is out of the scope of this feature request.&lt;/p&gt;</comment>
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