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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-5505] $size queries should use index if possible</title>
                <link>https://jira.mongodb.org/browse/SERVER-5505</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I believe that $size queries should use index if it exists for the column. At the very least, the $size:0 should be easy to implement, because currently one has to resort to comparing to an empty array.&lt;/p&gt;</description>
                <environment></environment>
        <key id="35488">SERVER-5505</key>
            <summary>$size queries should use index if possible</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="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="9">Done</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="onyxmaster">Aristarkh Zagorodnikov</reporter>
                        <labels>
                            <label>array</label>
                            <label>indexing</label>
                            <label>query</label>
                    </labels>
                <created>Wed, 4 Apr 2012 18:39:35 +0000</created>
                <updated>Tue, 6 Dec 2022 05:34:11 +0000</updated>
                            <resolved>Thu, 22 Feb 2018 19:15:56 +0000</resolved>
                                    <version>2.0.4</version>
                                                    <component>Index Maintenance</component>
                    <component>Querying</component>
                    <component>Usability</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1813288" author="asya" created="Thu, 22 Feb 2018 19:15:56 +0000"  >&lt;p&gt;Since the ticket was filed the docs now mention:&lt;/p&gt;

&lt;p&gt;&quot;Queries cannot use indexes for the $size portion of a query, although the other portions of a query can use indexes if applicable.&quot;&lt;/p&gt;</comment>
                            <comment id="106865" author="onyxmaster" created="Thu, 5 Apr 2012 07:54:27 +0000"  >&lt;p&gt;Ah, well, then I think docs should mention that $size queries are not indexed and that one can approximate $size:0 query with empty array comparison (maybe it&apos;s there, but I couldn&apos;t find it).&lt;/p&gt;</comment>
                            <comment id="106787" author="eliot" created="Thu, 5 Apr 2012 00:58:35 +0000"  >&lt;p&gt;The general case of this can&apos;t use an index as we store entries, not size.&lt;/p&gt;</comment>
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