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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-42835] Inconsistent handling of arrays as $group keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-42835</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p/&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;{ &quot;_id&quot; : 2 }&lt;/span&gt;&lt;/pre&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;{ &quot;_id&quot; : 1, &quot;x&quot; : null }&lt;/span&gt;&lt;/pre&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;{ &quot;_id&quot; : 3, &quot;y&quot; : null }&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;{ &quot;_id&quot; : 4, &quot;x&quot; : null, &quot;y&quot; : null }&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; db.foo.aggregate([{$group: {_id: [&quot;$x&quot;, &quot;$y&quot;]}}])&lt;/span&gt;&lt;/pre&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;{ &quot;_id&quot; : [ &quot;$x&quot;, &quot;$y&quot; ] }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I would contend that the middle one should result in &lt;/p&gt;
&lt;p/&gt;
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				&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;{_id: [null, null]}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Looks like &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c0ca6049bad1bf918e46d83cddab134b7441abf7/src/mongo/db/pipeline/document_source_group.cpp#L381&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; is the offending line.&lt;/p&gt;</description>
                <environment></environment>
        <key id="897515">SERVER-42835</key>
            <summary>Inconsistent handling of arrays as $group keys</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="13201">Fixed</resolution>
                                        <assignee username="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Thu, 15 Aug 2019 20:43:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:02 +0000</updated>
                            <resolved>Mon, 30 Sep 2019 20:21:55 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2441198" author="xgen-internal-githook" created="Mon, 30 Sep 2019 20:18:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ted Tuckman&apos;, &apos;username&apos;: &apos;TedTuckman&apos;, &apos;email&apos;: &apos;ted.tuckman@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42835&quot; title=&quot;Inconsistent handling of arrays as $group keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42835&quot;&gt;&lt;del&gt;SERVER-42835&lt;/del&gt;&lt;/a&gt; Fix inconsistent handling of arrays as $group keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8e981e8315ab7c7bae93da623e40ffdce5b4ec6e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8e981e8315ab7c7bae93da623e40ffdce5b4ec6e&lt;/a&gt;&lt;/p&gt;</comment>
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