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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-52963] [SBE] Add support for ExpressionMeta when _metaType == MetaType::kIndexKey </title>
                <link>https://jira.mongodb.org/browse/SERVER-52963</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A simple query with an index and $meta fails.&lt;/p&gt;

&lt;p&gt;Right now the query from the &quot;Steps To Reproduce&quot; section hits an invariant failure:&#160;reqs.has(kReturnKey) || !ixn-&amp;gt;addKeyMetadata .&lt;/p&gt;

&lt;p&gt;I tried fixing this invariant by calling PlanStageReqs::set() at the top level to set kReturnKey, and then I re-ran the query&#160;from the &quot;Steps To Reproduce&quot; section. When I did this, I got the following error message: &quot;Expression is not supported in SBE: $meta&quot;.&lt;/p&gt;

&lt;p&gt;So it looks like we need to update &quot;sbe_stage_builder_expression.cpp&quot; so that it can handle&#160;ExpressionMeta with _metaType ==&#160;MetaType::kIndexKey .&lt;/p&gt;</description>
                <environment></environment>
        <key id="1548004">SERVER-52963</key>
            <summary>[SBE] Add support for ExpressionMeta when _metaType == MetaType::kIndexKey </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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="martin.neupauer@mongodb.com">Martin Neupauer</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Fri, 20 Nov 2020 15:08:00 +0000</created>
                <updated>Tue, 6 Dec 2022 01:43:51 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>0</votes>
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&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;&amp;gt; db.adminCommand({setParameter: 1, internalQueryEnableSlotBasedExecutionEngine: true});&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;&amp;gt; db.c1.createIndex({a: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;&amp;gt; db.c1.find({a: 1}, {c: {$meta: &apos;indexKey&apos;}});&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;&#160;&lt;/p&gt;</customfieldvalue>

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