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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-48905] Allow $rand in command-level &apos;let&apos;</title>
                <link>https://jira.mongodb.org/browse/SERVER-48905</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, command-level &apos;let&apos; only accepts expressions that optimize to a constant. We&apos;d like to allow $rand in a command-level &apos;let&apos;: it would pick a random value once up front, and the bound variable would be constant throughout the query. We can make this work by calling evaluate() instead of optimize().&lt;/p&gt;

&lt;p&gt;But we should still report an error when the expression tries to refer to any field (as opposed to returning missing). We can use DepsTracker to uassert when the command-level-let-bound expressions have any unmet dependencies (fields, variables, or metadata).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1382011">SERVER-48905</key>
            <summary>Allow $rand in command-level &apos;let&apos;</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="13201">Fixed</resolution>
                                        <assignee username="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Tue, 16 Jun 2020 20:14:22 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:53 +0000</updated>
                            <resolved>Mon, 17 Aug 2020 21:59:58 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3343316" author="xgen-internal-githook" created="Mon, 17 Aug 2020 20:30:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;, &apos;username&apos;: &apos;dpercy&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48905&quot; title=&quot;Allow $rand in command-level &amp;#39;let&amp;#39;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48905&quot;&gt;&lt;del&gt;SERVER-48905&lt;/del&gt;&lt;/a&gt; Allow $rand in command-level &apos;let&apos;&lt;/p&gt;

&lt;p&gt;This relaxes a restriction on command-level &apos;let&apos; bindings: instead of&lt;br/&gt;
requiring them to optimize() to a constant, we evaluate() them, once,&lt;br/&gt;
before running the query. This means {$rand: {}} is now allowed in a&lt;br/&gt;
command-level &apos;let&apos;.&lt;/p&gt;

&lt;p&gt;Referring to a field doesn&apos;t make sense in a command-level &apos;let&apos;, because&lt;br/&gt;
there is no &quot;current document&quot; yet. So we use DepsTracker to report an error,&lt;br/&gt;
rather than evaluate to missing.&lt;/p&gt;

&lt;p&gt;Unbound variables are disallowed with the usual mechanism.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/209bec74d8716aa97080b84aadc58ef811277f3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/209bec74d8716aa97080b84aadc58ef811277f3d&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2310998">SERVER-75927</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2470800">SERVER-82042</issuekey>
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