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    <title>MongoDB Jira</title>
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    <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-68405] Constant Nothing in $group&apos;s _id expression should be converted to null in $group SBE stage builder</title>
                <link>https://jira.mongodb.org/browse/SERVER-68405</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p/&gt;
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&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.a.insert({_id: 1});&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.a.explain().aggregate([{$group: {_id: &quot;$$REMOVE&quot;, o: {$first: &quot;$a&quot;}}}]).queryPlanner.winningPlan.slotBasedPlan.stages;&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;[2] mkbson s9 [_id = s6, o = s8] true false&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;[2] group [s6] [s8 = first (fillEmpty (s7, 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;[2] project [s7 = getField (s4, &quot;a&quot;)]&lt;/span&gt;&lt;/pre&gt;
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		&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;[2] project [s6 = Nothing]&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;   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;[1] scan s4 s5 none none none none [] @&quot;39336b7b-b5b8-4328-8ae6-e5a7e9ce31ae&quot; true false&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;&lt;tt&gt;project &lt;span class=&quot;error&quot;&gt;&amp;#91;s6 = Nothing&amp;#93;&lt;/span&gt;&lt;/tt&gt; should be &lt;tt&gt;project &lt;span class=&quot;error&quot;&gt;&amp;#91;s6 = fillEmpty (Nothing, null)&amp;#93;&lt;/span&gt;&lt;/tt&gt;. We can&apos;t do &lt;tt&gt;project &lt;span class=&quot;error&quot;&gt;&amp;#91;s6 = null&amp;#93;&lt;/span&gt;&lt;/tt&gt; because &lt;tt&gt;EConstant&lt;/tt&gt; does not have a method to examine its value.&lt;/p&gt;

&lt;p&gt;This is a bug in $group SBE stage builder and so backport to v6.0 is necessary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2101833">SERVER-68405</key>
            <summary>Constant Nothing in $group&apos;s _id expression should be converted to null in $group SBE stage builder</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Jul 2022 18:36:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:11 +0000</updated>
                            <resolved>Fri, 29 Jul 2022 01:17:45 +0000</resolved>
                                    <version>5.3.2</version>
                    <version>6.0.0</version>
                                    <fixVersion>6.0.1</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4724091" author="JIRAUSER1258488" created="Wed, 3 Aug 2022 02:13:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/83aa49a574aa94a8aae095257fcc375942007dd9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/83aa49a574aa94a8aae095257fcc375942007dd9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4713406" author="xgen-internal-githook" created="Fri, 29 Jul 2022 01:13:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68405&quot; title=&quot;Constant Nothing in $group&amp;#39;s _id expression should be converted to null in $group SBE stage builder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68405&quot;&gt;&lt;del&gt;SERVER-68405&lt;/del&gt;&lt;/a&gt; Convert Nothing for _id expression in $group to Null&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f9999bebae62b6ce3b7e534f32ba4803e15ff3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f9999bebae62b6ce3b7e534f32ba4803e15ff3d&lt;/a&gt;&lt;/p&gt;</comment>
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