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    <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-22442] Allow hashed indexes to support $ne queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-22442</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When performing a $ne query such as:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.getCollection(&apos;users&apos;).find({ &apos;name.middle&apos;: { &apos;$ne&apos;: null } }).hint({&apos;name.middle&apos;: &apos;hashed&apos;}).explain()&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I can see a full table scan is being performed before returning the result and the hash index is being ignored.&lt;br/&gt;
In our case, most of the records would have a null value and thus using the index to quickly reach out to the few relevant documents would have been much more efficient.&lt;/p&gt;

&lt;p&gt;To workaround this, we had to resort to using a regular index on top of the more efficient/small hashed index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="262656">SERVER-22442</key>
            <summary>Allow hashed indexes to support $ne queries</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="nmardiks">Nir Mardiks</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Feb 2016 20:52:14 +0000</created>
                <updated>Tue, 6 Dec 2022 04:34:32 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1161892" author="dan@10gen.com" created="Wed, 3 Feb 2016 01:38:59 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nmardiks&quot; class=&quot;user-hover&quot; rel=&quot;nmardiks&quot;&gt;nmardiks&lt;/a&gt;, It may be useful for your use case to use a partial index if you want to index only a subset of your documents.  &lt;a href=&quot;https://docs.mongodb.org/manual/core/index-partial/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/manual/core/index-partial/&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1161658" author="thomas.schubert" created="Tue, 2 Feb 2016 21:36:21 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nmardiks&quot; class=&quot;user-hover&quot; rel=&quot;nmardiks&quot;&gt;nmardiks&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you opening this ticket. Hashed indexes do not support &lt;a href=&quot;https://docs.mongodb.org/manual/core/index-hashed/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;range based queries&lt;/a&gt;, so I am marking it as a new feature to be scheduled during the next round of planning.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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