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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-5904] embedded doc matches could use dotted field indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-5904</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Ex:&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.user.ensureIndex({ &quot;a.x&quot;: 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;   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.user.insert({ a: { x: 1, y: 2 }});&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;   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.user.find({ &quot;a.x&quot;: 1 }).explain(); // uses index&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.user.find({ a: { x: 1 }}).explain(); // doesn&apos;t use index&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;Both queries gives you the expected result but the latter doesn&apos;t use an index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="39408">SERVER-5904</key>
            <summary>embedded doc matches could use dotted field indexes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 May 2012 02:23:08 +0000</created>
                <updated>Tue, 6 Dec 2022 05:33:12 +0000</updated>
                            <resolved>Mon, 9 Oct 2017 18:13:48 +0000</resolved>
                                    <version>2.1.1</version>
                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1693448" author="asya" created="Mon, 9 Oct 2017 18:13:48 +0000"  >&lt;p&gt;This behavior is correct since the syntax&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;   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.user.find({ a: { x: 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;does not match the given document, but only a being exactly subdocument {x:1} and it will use index on &quot;a&quot; for that query.&lt;/p&gt;</comment>
                            <comment id="130220" author="eliot" created="Mon, 11 Jun 2012 12:11:40 +0000"  >&lt;p&gt;If you try both queries, the first will match the document inserted, the 2nd will not.&lt;/p&gt;</comment>
                            <comment id="130189" author="jroper" created="Mon, 11 Jun 2012 11:05:26 +0000"  >&lt;p&gt;Are they really semantically different?  What&apos;s a result that could be returned by one and not the other?&lt;/p&gt;

&lt;p&gt;If there is such a result, then it would seem to me that the second queries results would always be a subset of the first queries results, hence the second query could use the index, and then apply further filtering.&lt;/p&gt;

&lt;p&gt;As it stands, it would be very easy for someone to create the correct indexes, but, without realising, not be using them (until they encounter a massive performance issue in production).&lt;/p&gt;</comment>
                            <comment id="122181" author="eliot" created="Wed, 23 May 2012 02:38:48 +0000"  >&lt;p&gt;semantically different, so not sure what the right approach is.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="16141">SERVER-2953</issuekey>
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