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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-55065] Null queries should be covered by index where possible with current index format</title>
                <link>https://jira.mongodb.org/browse/SERVER-55065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Before changing the index format, it is only possible to cover null queries in certain conditions:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the index being scanned is not multikey, because indexes alone cannot distinguish between null, missing, undefined, and empty array values&lt;/li&gt;
	&lt;li&gt;the query is either not projecting (as in the case of either legacy or aggregation count) or the query is projecting directly only onto the _id field. This is possible because _id fields are guaranteed to be unique and present, so we can have at most one _id field set to null in the index (meaning we would always get the right value for _id from the index).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Furthermore, we can optimize counts to use two COUNT_SCANs joined by an OR stage when a single null interval is encountered (instead of just using an INDEX_SCAN with a. filter).&lt;/p&gt;

&lt;p&gt;This branched off of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18861&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-18861&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1644583">SERVER-55065</key>
            <summary>Null queries should be covered by index where possible with current index format</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="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="13201">Fixed</resolution>
                                        <assignee username="alya.berciu@mongodb.com">Alya Berciu</assignee>
                                    <reporter username="alya.berciu@mongodb.com">Alya Berciu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Mar 2021 16:45:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:31 +0000</updated>
                            <resolved>Fri, 19 Mar 2021 09:00:16 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3671737" author="xgen-internal-githook" created="Thu, 18 Mar 2021 17:37:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Alya Berciu&apos;, &apos;email&apos;: &apos;alyacarina@gmail.com&apos;, &apos;username&apos;: &apos;alyacb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55065&quot; title=&quot;Null queries should be covered by index where possible with current index format&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55065&quot;&gt;&lt;del&gt;SERVER-55065&lt;/del&gt;&lt;/a&gt;: Cover null queries with index where possible&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/54a41757d77002b015c7bceca87c59f35e5a564f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/54a41757d77002b015c7bceca87c59f35e5a564f&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="114107">SERVER-12869</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="209047">SERVER-18861</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="375967">SERVER-28889</issuekey>
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