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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-21065] Optimizer should consider predicate with &quot;$in&quot; operator having a single argument to be equivalent to the equality operator</title>
                <link>https://jira.mongodb.org/browse/SERVER-21065</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Query shapes like {a: { &quot;$in&quot;: &lt;span class=&quot;error&quot;&gt;&amp;#91;1&amp;#93;&lt;/span&gt;}, b:1, c: { &quot;$in&quot;: &lt;span class=&quot;error&quot;&gt;&amp;#91;1,2,3&amp;#93;&lt;/span&gt;}} and {a: 1, b:1, c: { &quot;$in&quot;: &lt;span class=&quot;error&quot;&gt;&amp;#91;1,2,3&amp;#93;&lt;/span&gt;}} are cached separately while they are equivalent.&lt;/p&gt;

&lt;p&gt;It may not be a big problem, but mongod could be smart enough to recognize this.&lt;/p&gt;</description>
                <environment></environment>
        <key id="235630">SERVER-21065</key>
            <summary>Optimizer should consider predicate with &quot;$in&quot; operator having a single argument to be equivalent to the equality operator</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="9">Done</resolution>
                                        <assignee username="benjamin.murphy">Benjamin Murphy</assignee>
                                    <reporter username="dmitry.ryabtsev@mongodb.com">Dmitry Ryabtsev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Oct 2015 05:52:41 +0000</created>
                <updated>Tue, 17 Jan 2017 17:46:34 +0000</updated>
                            <resolved>Mon, 11 Apr 2016 15:55:39 +0000</resolved>
                                                    <fixVersion>3.3.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1232037" author="xgen-internal-githook" created="Mon, 11 Apr 2016 15:55:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benjaminmurphy&apos;, u&apos;name&apos;: u&apos;Benjamin Murphy&apos;, u&apos;email&apos;: u&apos;benjamin_murphy@me.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21065&quot; title=&quot;Optimizer should consider predicate with &amp;quot;$in&amp;quot; operator having a single argument to be equivalent to the equality operator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21065&quot;&gt;&lt;del&gt;SERVER-21065&lt;/del&gt;&lt;/a&gt; Fixed use-after-free in canonical_query_test.cpp.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0a5732f6b65563f9d600578c9101cc2082f117f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0a5732f6b65563f9d600578c9101cc2082f117f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1231017" author="max.hirschhorn@10gen.com" created="Sat, 9 Apr 2016 02:30:42 +0000"  >&lt;p&gt;Re-opening this ticket so that the heap-use-after-free in &lt;tt&gt;canonical_query_test&lt;/tt&gt; can be addressed.&lt;/p&gt;</comment>
                            <comment id="1229152" author="xgen-internal-githook" created="Thu, 7 Apr 2016 15:03:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;benjaminmurphy&apos;, u&apos;name&apos;: u&apos;Benjamin Murphy&apos;, u&apos;email&apos;: u&apos;benjamin_murphy@me.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21065&quot; title=&quot;Optimizer should consider predicate with &amp;quot;$in&amp;quot; operator having a single argument to be equivalent to the equality operator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21065&quot;&gt;&lt;del&gt;SERVER-21065&lt;/del&gt;&lt;/a&gt; CanonicalQuery::normalizeTree optimizes InMatchExpression with one child.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/723acb4f039f2431f5a315f4f4fe0151a63da825&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/723acb4f039f2431f5a315f4f4fe0151a63da825&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1068928" author="david.storch" created="Fri, 23 Oct 2015 14:20:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12024&quot; title=&quot;re-implement $in in terms of $or&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12024&quot;&gt;SERVER-12024&lt;/a&gt; could be one good way to solve this.&lt;/p&gt;</comment>
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            <issuekey id="274794">SERVER-23330</issuekey>
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            <issuekey id="235625">SERVER-21064</issuekey>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="346335">SERVER-27707</issuekey>
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