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    <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-61941] $sortArray comparator does not satisfy &quot;Compare&quot; requirement with -1 sort</title>
                <link>https://jira.mongodb.org/browse/SERVER-61941</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To sort an STL container with &lt;tt&gt;std::sort()&lt;/tt&gt;, the custom comparator used must satisfy the &lt;a href=&quot;https://en.cppreference.com/w/cpp/named_req/Compare&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;Compare&lt;/tt&gt; named requirement&lt;/a&gt;. Specifically,&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;&lt;tt&gt;comp(a, b)&lt;/tt&gt;: Establishes strict weak ordering relation with the following properties:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;For all a, comp(a,a)==false&lt;/li&gt;
&lt;/ul&gt;
&lt;/blockquote&gt;

&lt;p&gt;When sorting by whole values descending (specifically, &lt;tt&gt;sortBy: -1&lt;/tt&gt;), we do the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5117fe4c17287501311df53d66335026e04a032e/src/mongo/db/update/pattern_cmp.cpp#L110-L116&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;following negation&lt;/a&gt;:&lt;/p&gt;
&lt;p/&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-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;    if (useWholeValue) {&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;        const bool ascending = ValueComparator(collator).getLessThan()(lhs, rhs);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;        const bool reversed = (sortPattern.firstElement().number() &amp;lt; 0);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&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;        return (reversed ? !ascending : ascending);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;Simply negating &lt;tt&gt;ascending&lt;/tt&gt; is not correct, because when comparing two equal values, &lt;tt&gt;getLessThan()&lt;/tt&gt; should return false for both.&lt;/p&gt;

&lt;p&gt;This logic error triggers a fatal assertion on Windows debug builds, because the &lt;a href=&quot;https://github.com/microsoft/STL/blob/e89128e7383e9b54dec4b091bb0125c41439a3b6/stl/inc/algorithm#L9736-L9741&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MSVC STL implementation checks for the validity of the comparator&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1944065">SERVER-61941</key>
            <summary>$sortArray comparator does not satisfy &quot;Compare&quot; requirement with -1 sort</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="andrii.dobroshynski@mongodb.com">Andrii Dobroshynski</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Dec 2021 15:42:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:45:15 +0000</updated>
                            <resolved>Wed, 8 Dec 2021 20:37:46 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4239354" author="kyle.suarez" created="Thu, 9 Dec 2021 19:03:39 +0000"  >&lt;p&gt;I am updating the fix version to &quot;5.2.0-rc1&quot;:&lt;/p&gt;
&lt;p/&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;xerograph:~/mongo-dev/mongo &#9829; git describe ae1b90d86fa2fa5e3393bae921f25767aecd9800&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;r5.2.0-rc0-1-gae1b90d86f&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;FYI &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=server-release&quot; class=&quot;user-hover&quot; rel=&quot;server-release&quot;&gt;server-release&lt;/a&gt; that PM Bot is still tagging things with the fix version &quot;5.2.0&quot;; I&apos;m not sure if that&apos;s intentional after we&apos;ve branched for 5.2.&lt;/p&gt;</comment>
                            <comment id="4238942" author="xgen-internal-githook" created="Thu, 9 Dec 2021 16:17:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrii Dobroshynski&apos;, &apos;email&apos;: &apos;andrii.dobroshynski@mongodb.com&apos;, &apos;username&apos;: &apos;dobroshynski&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61941&quot; title=&quot;$sortArray comparator does not satisfy &amp;quot;Compare&amp;quot; requirement with -1 sort&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61941&quot;&gt;&lt;del&gt;SERVER-61941&lt;/del&gt;&lt;/a&gt; Make $sortArray comparator satisfy &quot;Compare&quot; requirement with -1 sort&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6d0d66137f0217f6f9299e4af62daa0b507e9937)&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae1b90d86fa2fa5e3393bae921f25767aecd9800&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae1b90d86fa2fa5e3393bae921f25767aecd9800&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4237370" author="xgen-internal-githook" created="Wed, 8 Dec 2021 18:41:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Andrii Dobroshynski&apos;, &apos;email&apos;: &apos;andrii.dobroshynski@mongodb.com&apos;, &apos;username&apos;: &apos;dobroshynski&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61941&quot; title=&quot;$sortArray comparator does not satisfy &amp;quot;Compare&amp;quot; requirement with -1 sort&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61941&quot;&gt;&lt;del&gt;SERVER-61941&lt;/del&gt;&lt;/a&gt; Make $sortArray comparator satisfy &quot;Compare&quot; requirement with -1 sort&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d0d66137f0217f6f9299e4af62daa0b507e9937&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d0d66137f0217f6f9299e4af62daa0b507e9937&lt;/a&gt;&lt;/p&gt;</comment>
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