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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>
    </build-info>


<item>
            <title>[SERVER-3104] index bound improvements for elemMatch query on multikey index</title>
                <link>https://jira.mongodb.org/browse/SERVER-3104</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo does not compute a cartesian product when creating a compound index on multiple fields.  If the document { a:[ &lt;/p&gt;
{ b:1, c:2 }
&lt;p&gt;, &lt;/p&gt;
{ b:10, c:20 }
&lt;p&gt; ] } is indexed according to index &lt;/p&gt;
{ &apos;a.b&apos;:1, &apos;a.c&apos;:1 }
&lt;p&gt;, the index keys created are &lt;/p&gt;
{ &apos;&apos;:1, &apos;&apos;:2 }
&lt;p&gt; and &lt;/p&gt;
{ &apos;&apos;:10, &apos;&apos;:20 }
&lt;p&gt;.  (There is no index key &lt;/p&gt;
{ &apos;&apos;:1, &apos;&apos;:20 }
&lt;p&gt; for example.)&lt;/p&gt;

&lt;p&gt;A) Now, suppose we have a query &lt;/p&gt;
{ &apos;a.b&apos;:1, &apos;a.c&apos;:20 }
&lt;p&gt;.  This query is supposed to match the document, because an &apos;a.b&apos; value of 1 exists in the document, and an &apos;a.c&apos; value of 20 exists in the document.  However, there is no index key containing both 1 in the &apos;a.b&apos; position and 20 in the &apos;a.c&apos; position.  As a result, the index bounds on &apos;a.b&apos; will be [[ 1, 1 ]] but there will not be any index bounds on &apos;a.c&apos;.  This means the index key &lt;/p&gt;
{ &apos;&apos;:1, &apos;&apos;:2 }
&lt;p&gt; will be retrieved and used to find the full document, and the Matcher will determine that the full document matches the query.  Here&apos;s a demo:&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;c = db.c;&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;c.drop();&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;c.save( { a:[ { b:1, c:2 }, { b:10, c:20 } ] } );&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;c.ensureIndex( { &apos;a.b&apos;:1, &apos;a.c&apos;: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;printjson( c.find( { &apos;a.b&apos;:1, &apos;a.c&apos;:20 } ).explain() );&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;B) However, if $elemMatch is used in the query then an element of the &apos;a&apos; array must match all the $elemMatch criteria.  In other words, if the query becomes { a:{ $elemMatch:&lt;/p&gt;
{ b:1, c:20 }
&lt;p&gt; } } then the original document will not match because no element of a matches &lt;/p&gt;
{ b:1, c:20 }
&lt;p&gt;.  In this case, index keys lacking a match on one field (like &lt;/p&gt;
{ &apos;&apos;:1, &apos;&apos;:2 }
&lt;p&gt;) need not be examined, and precise index bounds can be used for the &apos;a.c&apos; field.  Here&apos;s a demo:&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;c = db.c;&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;c.drop();&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;c.save( { a:[ { b:1, c:2 }, { b:10, c:20 } ] } );&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;c.ensureIndex( { &apos;a.b&apos;:1, &apos;a.c&apos;: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;printjson( c.find( { a:{ $elemMatch:{ b:1, c:20 } } } ).explain() );&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;This ticket implements the index bounds behavior seen in B.  More precisely, our old behavior was that if two indexed field paths shared a common prefix, then only the first of those field paths appearing in the index would have its index bounds used for the query.  With this ticket, if the index bounds for the two field paths come from the same $elemMatch clause then the index bounds on both field paths are used for the query.&lt;/p&gt;

&lt;p&gt;Additionally, this optimization is only applied if the field names within the $elemMatch are undotted.  There are some cases where the optimization does not work correctly if the fields are dotted, described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7509&quot; title=&quot;Combine index ranges for dotted fields within a $elemMatch expression, when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7509&quot;&gt;&lt;del&gt;SERVER-7509&lt;/del&gt;&lt;/a&gt;.  Also, this ticket does not affect the behavior for determining which index bounds among a set of candidate index bounds are chosen for a given field.  For example, in the query { &apos;a.b&apos;:&lt;/p&gt;
{ $gt:10 }
&lt;p&gt;, a:{ $elemMatch:&lt;/p&gt;
{ b:2, c:3 }
&lt;p&gt; } may use the field path [&lt;span class=&quot;error&quot;&gt;&amp;#91;10, max number&amp;#93;&lt;/span&gt;] on &apos;a.b&apos; rather than [&lt;span class=&quot;error&quot;&gt;&amp;#91;2, 2&amp;#93;&lt;/span&gt;].&lt;/p&gt;

&lt;p&gt;---------------------&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;// Given a multikey index { &apos;a.b&apos;:1, &apos;a.c&apos;:1 } and query { &apos;a.b&apos;:3, &apos;a.c&apos;:3 } only the index field&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;// &apos;a.b&apos; is constrained to the range [3, 3], while the index field &apos;a.c&apos; is just constrained&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;// to be within minkey and maxkey.  This implementation ensures that the document&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;// { a:[ { b:3 }, { c:3 } ] }, which generates index keys { &apos;a.b&apos;:3, &apos;a.c&apos;:null } and&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;// { &apos;a.b&apos;:null and &apos;a.c&apos;:3 } will be retrieved for the query.  (See SERVER-958 for more&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;// information.)&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;//&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;// If the query is instead { a:{ $elemMatch:{ b:3, c:3 } } } then the document&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;// { a:[ { b:3 }, { c:3 } ] } does not match.  Until SERVER-3104 was implemented, the 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;   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;// constraints would be [3,3] on the &apos;a.b&apos; field and [minkey,maxkey] on the &apos;a.c&apos; field, the same as&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;// for the non $elemMatch query in the previous paragraph.  With the SERVER-3104 implementation,&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;// constraints on two fields within a $elemMatch parent can both be applied to an index.  Due to the&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;// SERVER-3104 implementation, the index constraints become [3,3] on the &apos;a.b&apos; field _and_ [3,3] on&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;// the &apos;a.c&apos; field.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="17142">SERVER-3104</key>
            <summary>index bound improvements for elemMatch query on multikey index</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="aaron">Aaron Staple</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 May 2011 18:44:15 +0000</created>
                <updated>Wed, 28 Oct 2015 04:11:28 +0000</updated>
                            <resolved>Wed, 10 Oct 2012 20:22:54 +0000</resolved>
                                                    <fixVersion>2.3.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>22</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="267133" author="auto" created="Fri, 15 Feb 2013 14:56:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-14T17:04:29Z&apos;, u&apos;name&apos;: u&apos;Siddharth Singh&apos;, u&apos;email&apos;: u&apos;siddharth.singh@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3104&quot; title=&quot;index bound improvements for elemMatch query on multikey index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3104&quot;&gt;&lt;del&gt;SERVER-3104&lt;/del&gt;&lt;/a&gt; Test index bound improvements for elemMatch query on multikey index&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a09abdaa6c93c50d3b58ee97597baff96e02475b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a09abdaa6c93c50d3b58ee97597baff96e02475b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="173452" author="auto" created="Wed, 10 Oct 2012 18:30:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-07-31T16:10:59-07:00&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;, u&apos;name&apos;: u&apos;Aaron&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3104&quot; title=&quot;index bound improvements for elemMatch query on multikey index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3104&quot;&gt;&lt;del&gt;SERVER-3104&lt;/del&gt;&lt;/a&gt; Allow intersection of sibling multikey index field ranges having a shared $elemMatch parent.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1085e542dd4ed1cb7f304e6095c63562f16d65b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1085e542dd4ed1cb7f304e6095c63562f16d65b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="92110" author="lojic" created="Fri, 24 Feb 2012 22:00:32 +0000"  >&lt;p&gt;I voted and watched, but I just wanted to add a comment re: how important this is to me. I have an app that is stuck on v1.8 due to the lack of this. I would love to be able to upgrade. Some more context on my particular issue is in this thread:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_frm/thread/719f6a34c30d7fab/dd3d29a0da8470cb#dd3d29a0da8470cb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_frm/thread/719f6a34c30d7fab/dd3d29a0da8470cb#dd3d29a0da8470cb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="91255" author="kvirkki" created="Thu, 23 Feb 2012 07:31:04 +0000"  >&lt;p&gt;@Eliot: &lt;a href=&quot;http://groups.google.com/group/mongodb-user/browse_thread/thread/f3ac1160d54f9881&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/browse_thread/thread/f3ac1160d54f9881&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="91238" author="eliot" created="Thu, 23 Feb 2012 06:33:49 +0000"  >&lt;p&gt;@kai - not sure - can you follow up on &lt;a href=&quot;http://groups.google.com/group/mongodb-user/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://groups.google.com/group/mongodb-user/&lt;/a&gt; with doc, query and explain output&lt;/p&gt;</comment>
                            <comment id="90886" author="kvirkki" created="Wed, 22 Feb 2012 16:04:51 +0000"  >&lt;p&gt;Is my question on dba.stackexchange related to this same issue?&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://dba.stackexchange.com/questions/13661/how-to-index-dynamic-attributes-in-mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://dba.stackexchange.com/questions/13661/how-to-index-dynamic-attributes-in-mongodb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="33150" author="auto" created="Tue, 17 May 2011 20:10:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3104&quot; title=&quot;index bound improvements for elemMatch query on multikey index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3104&quot;&gt;&lt;del&gt;SERVER-3104&lt;/del&gt;&lt;/a&gt; comment&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2ea2ae914a52bb8bc865f1923f55955f75462b27&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2ea2ae914a52bb8bc865f1923f55955f75462b27&lt;/a&gt;&lt;/p&gt;</comment>
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