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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35337] Implement/test existence and null comparison queries using &quot;allPaths&quot; indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-35337</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&quot;allPaths&quot; indexes have a sparseness property by default, so the planning behavior is special for $exists:true, $exists:false, $eq:null, $ne:null, etc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="552728">SERVER-35337</key>
            <summary>Implement/test existence and null comparison queries using &quot;allPaths&quot; indexes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Jun 2018 14:08:16 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:12 +0000</updated>
                            <resolved>Fri, 24 Aug 2018 17:44:04 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1985177" author="xgen-internal-githook" created="Fri, 24 Aug 2018 17:41:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;samontea&apos;, &apos;email&apos;: &apos;merciers.merciers@gmail.com&apos;, &apos;username&apos;: &apos;samontea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35337&quot; title=&quot;Implement/test existence and null comparison queries using &amp;quot;allPaths&amp;quot; indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35337&quot;&gt;&lt;del&gt;SERVER-35337&lt;/del&gt;&lt;/a&gt; Implement/test existence and null comparison queries using &quot;allPaths&quot; indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6937c4f829d3cd1f24745c98bb47f16fa4d8de28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6937c4f829d3cd1f24745c98bb47f16fa4d8de28&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1961798" author="james.wahlin@10gen.com" created="Tue, 31 Jul 2018 17:17:37 +0000"  >&lt;p&gt;After further discussion, it looks like we could support null and existence queries using an &quot;allPaths&quot; index, given we generate keys for empty objects and empty top level arrays. These keys would be used for existence checks only, as we will continue to store leaf nodes for objects rather than than whole objects when non-empty. &lt;/p&gt;</comment>
                            <comment id="1960651" author="ian.boros" created="Mon, 30 Jul 2018 19:24:38 +0000"  >&lt;p&gt;As part of this ticket we should talk to Asya and be sure she&apos;s okay with not supporting this behavior.&lt;/p&gt;</comment>
                            <comment id="1960563" author="james.wahlin@10gen.com" created="Mon, 30 Jul 2018 18:26:55 +0000"  >&lt;p&gt;It is likely that &quot;allPaths&quot; indexes will not be able to support $exists queries. As it stands, we will not create an index entry for an object such as: { a: {} }, but existence or non-existence of such an object will impact the result of an existence query.&lt;/p&gt;

&lt;p&gt;Queries on equality to null will be similarly impacted as null can match on either an existing field with a null value or a missing field.&lt;/p&gt;</comment>
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            <issuekey id="552713">SERVER-35330</issuekey>
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