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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-23262] Using a $elemMatch with two $eq queries returns incorrect results</title>
                <link>https://jira.mongodb.org/browse/SERVER-23262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Using a $elemMatch with two $eq queries is returning all documents that only one of the $eq. And which one is matched depends on the order of the $eq in the statement.&lt;/p&gt;</description>
                <environment>Windows Server 2008R2, MongoChef</environment>
        <key id="273988">SERVER-23262</key>
            <summary>Using a $elemMatch with two $eq queries returns incorrect results</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="gnarlyrides@gmail.com">Jason Mccullough</reporter>
                        <labels>
                    </labels>
                <created>Mon, 21 Mar 2016 16:35:12 +0000</created>
                <updated>Wed, 23 Mar 2016 23:50:05 +0000</updated>
                            <resolved>Wed, 23 Mar 2016 23:50:05 +0000</resolved>
                                    <version>3.2.0</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1213289" author="thomas.schubert" created="Wed, 23 Mar 2016 23:50:05 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gnarlyrides%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;gnarlyrides@gmail.com&quot;&gt;gnarlyrides@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. This is expected behavior, and is a result of how javascript objects/dicts work:&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;
		&lt;tbody &gt;
				&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;   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;&amp;gt; x = {a:2, a:1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;{a:1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;You cannot have repeated fields of the same name at the same level.&lt;/p&gt;

&lt;p&gt;My understanding is that you have identified that a query using the &lt;tt&gt;$and&lt;/tt&gt; operator fulfills the needs of your use case.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1209918" author="gnarlyrides@gmail.com" created="Mon, 21 Mar 2016 17:33:16 +0000"  >&lt;p&gt;Explain gives:&lt;br/&gt;
&quot;winningPlan&quot; : {&lt;br/&gt;
			&quot;stage&quot; : &quot;COLLSCAN&quot;,&lt;br/&gt;
			&quot;filter&quot; : {&lt;br/&gt;
				&quot;STags&quot; : {&lt;br/&gt;
					&quot;$elemMatch&quot; : {&lt;br/&gt;
						&quot;&quot; : &lt;/p&gt;
{
							&quot;$eq&quot; : &quot;OL:92_mlbx&quot;
						}
&lt;p&gt;					}&lt;br/&gt;
				}&lt;br/&gt;
			},&lt;br/&gt;
			&quot;direction&quot; : &quot;forward&quot;&lt;br/&gt;
		},&lt;br/&gt;
		&quot;rejectedPlans&quot; : [ ]&lt;/p&gt;

&lt;p&gt;clearly considering only one eq...&lt;/p&gt;</comment>
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&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;
		&lt;tbody &gt;
				&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;   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;{ &quot;STags&quot; : [ &quot;OD:52_domain.com&quot;, &quot;OL:92_mlbx&quot; ] }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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;{ &quot;STags&quot; : [ &quot;OD:49_domain.com&quot;, &quot;OL:92_mlbx&quot; ] }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Queries:&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;
		&lt;tbody &gt;
				&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;   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.test.find({&quot;STags&quot; : { $elemMatch : { $eq : &quot;OD:52_domain.com&quot;, $eq : &quot;OL:92_mlbx&quot;} }})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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-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.test.find({&quot;STags&quot; : { $elemMatch : { $eq : &quot;OD:sdsfsfd&quot;, $eq : &quot;OL:92_mlbx&quot;} }})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Both queries return two documents. even though 2nd query specifies a values that does NOT exist in any document.&lt;/p&gt;

&lt;p&gt;Replacing the $elemMath by a $and does not exhibit the same behaviour and returns the correct results.&lt;/p&gt;</customfieldvalue>

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