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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-82368] Match top/bottom N accumulators in SBE and Classic</title>
                <link>https://jira.mongodb.org/browse/SERVER-82368</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently in Classic, $bottom accumulator will compare arrays element-by-element, which is natural, but contradicts our documentation: &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/bson-type-comparison-order/#arrays&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/bson-type-comparison-order/#arrays&lt;/a&gt;&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;   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;A less-than comparison, or an ascending sort, compares the smallest elements of the array according to the BSON type sort order.&lt;/span&gt;&lt;/pre&gt;
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					&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;A greater-than comparison, or a descending sort, compares the largest elements of the array according to the reverse BSON type sort order. &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;SBE will follow the docs.&lt;/p&gt;

&lt;p&gt;This is because in Classic, accumulator wraps sort keys in array and sort key generator considers the array being nested, so it returns it fully in a sort key. SBE accepts document fully as-is, so the array is not nested, so only one element is returned as a sort key.&lt;/p&gt;

&lt;p&gt;Reproduction script is attached.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2480912">SERVER-82368</key>
            <summary>Match top/bottom N accumulators in SBE and Classic</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Mon, 23 Oct 2023 13:00:50 +0000</created>
                <updated>Mon, 20 Nov 2023 12:18:32 +0000</updated>
                            <resolved>Tue, 31 Oct 2023 17:52:29 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>7.0.5</fixVersion>
                    <fixVersion>6.0.13</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5891874" author="xgen-internal-githook" created="Mon, 20 Nov 2023 11:48:39 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82368&quot; title=&quot;Match top/bottom N accumulators in SBE and Classic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82368&quot;&gt;&lt;del&gt;SERVER-82368&lt;/del&gt;&lt;/a&gt; In top/bottom accumulator map sort fields to object fields not array&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5218a9a6d9058b8966bee1ed19d8397e50126e21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5218a9a6d9058b8966bee1ed19d8397e50126e21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5891588" author="xgen-internal-githook" created="Mon, 20 Nov 2023 08:49:44 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82368&quot; title=&quot;Match top/bottom N accumulators in SBE and Classic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82368&quot;&gt;&lt;del&gt;SERVER-82368&lt;/del&gt;&lt;/a&gt; In top/bottom accumulator map sort fields to object fields not array&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/afe533061125ca6deb824884acb55cc8fd3c8349&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/afe533061125ca6deb824884acb55cc8fd3c8349&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5843539" author="xgen-internal-githook" created="Tue, 31 Oct 2023 17:40:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82368&quot; title=&quot;Match top/bottom N accumulators in SBE and Classic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82368&quot;&gt;&lt;del&gt;SERVER-82368&lt;/del&gt;&lt;/a&gt; In top/bottom accumulator map sort fields to object fields not array&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/704ef3193b571c71455f00ef26bfa4ebc00a6d36&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/704ef3193b571c71455f00ef26bfa4ebc00a6d36&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5814154" author="JIRAUSER1270969" created="Fri, 27 Oct 2023 10:43:00 +0000"  >&lt;p&gt;The classic implementation affected array comparison by mistake, so we are going to match SBE and Classic and documentation altogether.&lt;/p&gt;</comment>
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