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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-17376] Allow $exists to efficiently use indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-17376</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently our indexes use null for both literal null and document doesn&apos;t contain such a value.  The document has to be fetched to make a distinction between these two things.  This means that what should be a simple use of an index turns into scanning many documents.  Not needing to fetch documents (for instance, having a &lt;/p&gt;
{no such field}
&lt;p&gt; bson type) to determine this would allow for indexes to be used efficiently in both $exists : true queries and other queries when using compound indexes without have to create both sparse and non-spare indexes to service different types of queries.&lt;/p&gt;</description>
                <environment></environment>
        <key id="186181">SERVER-17376</key>
            <summary>Allow $exists to efficiently use indexes</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="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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
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                <created>Wed, 25 Feb 2015 18:36:02 +0000</created>
                <updated>Wed, 25 Feb 2015 18:39:59 +0000</updated>
                            <resolved>Wed, 25 Feb 2015 18:39:47 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="837185" author="scotthernandez" created="Wed, 25 Feb 2015 18:39:47 +0000"  >&lt;p&gt;Dup of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12869&quot; title=&quot;Index null values and missing values differently&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12869&quot;&gt;SERVER-12869&lt;/a&gt;&lt;/p&gt;</comment>
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