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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-6613] using $elemMatch projection with $all gives unexpected results</title>
                <link>https://jira.mongodb.org/browse/SERVER-6613</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using $all, it results in x not appearing in the results&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;
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					&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;
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						&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;&amp;gt; t.find( { group:1 }, { _id : 0, x: { $elemMatch: { $all:[1, 2, 3] } } } ).limit(1)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&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;{ }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;May be better to uassert instead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="45485">SERVER-6613</key>
            <summary>using $elemMatch projection with $all gives unexpected 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="-1">Unassigned</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Jul 2012 21:45:48 +0000</created>
                <updated>Tue, 8 Dec 2015 23:14:52 +0000</updated>
                            <resolved>Tue, 8 Dec 2015 23:14:52 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                    <version>2.6.3</version>
                                                    <component>Querying</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1108929" author="david.storch" created="Tue, 8 Dec 2015 23:14:41 +0000"  >&lt;p&gt;This looks like it is &quot;Works as Designed&quot; to me. The $elemMatch projection&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;
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&lt;p/&gt;
&lt;p&gt;should be read as &quot;where &lt;em&gt;x&lt;/em&gt; is an array, include only the first array element matching &amp;lt;something&amp;gt;&quot;. Nothing gets project because none of the array elements (1, 2, 3, 4, or 5) match the predicate { $all: [1, 2, 3] } }.&lt;/p&gt;</comment>
                            <comment id="675764" author="thomasr" created="Tue, 29 Jul 2014 23:01:45 +0000"  >&lt;p&gt;This is still reproducible with above script in 2.6.3.&lt;/p&gt;</comment>
                            <comment id="147860" author="benjamin.becker" created="Thu, 26 Jul 2012 22:13:07 +0000"  >&lt;p&gt;Yes, we should definitely uassert if $all is specified as a parameter to $elemMatch.  &lt;/p&gt;</comment>
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