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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-43666] Sort by &quot;randVal&quot; is not random</title>
                <link>https://jira.mongodb.org/browse/SERVER-43666</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The SortKeyGenerator::extractKeyPart() function gets a &quot;randVal&quot; from the Document metadata (by way of Expression::evaluate()) when the key pattern has {$meta: &quot;&quot;randVal&quot;}. However, nowhere in the code base ever sets a random value for this piece of metadata, so the return value is always eoo. The sort deals with this lack of randomness by returning the documents in their natural order.&lt;/p&gt;

&lt;p&gt;I discovered this problem when I attempted to add an invariant after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5a0e08e83231cfa07aa1d00098d0712f3c2f8ab7/src/mongo/db/index/sort_key_generator.cpp#L247&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this line&lt;/a&gt; to ensure that:&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;
		&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;   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;invariant(!plainKey.missing());&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;Currently, this invariant always fails, but when we figure out a way to ensure that documents have &quot;randVal&quot; metadata, we should be able to add that invariant in.&lt;/p&gt;</description>
                <environment></environment>
        <key id="942469">SERVER-43666</key>
            <summary>Sort by &quot;randVal&quot; is not random</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="13202">Works as Designed</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Thu, 26 Sep 2019 23:19:45 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:04 +0000</updated>
                            <resolved>Wed, 23 Oct 2019 19:18:50 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2498065" author="david.storch" created="Wed, 23 Oct 2019 19:18:50 +0000"  >&lt;p&gt;I&apos;m closing this ticket as &quot;Works as Designed&quot;. Sort by &lt;tt&gt;$meta:&quot;randVal&quot;&lt;/tt&gt; was implemented internally in order to support &lt;tt&gt;$sample&lt;/tt&gt;. It is not documented: you can see that it is never mentioned in the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/sort/#definition&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;manual page for &lt;tt&gt;$sort&lt;/tt&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If we ever do want to expose a query operator that causes the order of the result set to be randomized, we would need to either 1) fully implement and expose a &quot;randVal&quot; meta-sort, or 2) expect applications to rely on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30405&quot; title=&quot;add expression to generate a random number&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30405&quot;&gt;&lt;del&gt;SERVER-30405&lt;/del&gt;&lt;/a&gt;, which would add an expression to generate a random number. In the latter case, users would need to do something like this:&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;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;db.collection.aggregate([..., {$addFields: {randVal: {$randVal: ...}}}, {$sort: {randVal: 1}}, ...]);&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;The behavior noted here was not introduced in 4.3 development, but rather exists in stable releases. I tested 4.2.0 in particular, though I suspect this behavior goes back to when &lt;tt&gt;$sample&lt;/tt&gt; was first implemented.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="409699">SERVER-30405</issuekey>
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                            <customfieldvalue>&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;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;MongoDB Enterprise &amp;gt; db.randval.insert([{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}])&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;
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			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&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;{ &quot;_id&quot; : ObjectId(&quot;5d8d449cb417f08bc7302868&quot;), &quot;a&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; : ObjectId(&quot;5d8d449cb417f08bc7302869&quot;), &quot;a&quot; : 3 }&lt;/span&gt;&lt;/pre&gt;
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