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    <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-54822] Push $sort before $unwind when possible</title>
                <link>https://jira.mongodb.org/browse/SERVER-54822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;$sort&lt;/tt&gt; should be pushed automatically before &lt;tt&gt;$unwind&lt;/tt&gt; if sort is happening on a different field.&lt;br/&gt;
E.g.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;db.foo.aggregation([{$unwind: &quot;fieldA&quot;},{$sort: { fieldB: 1}}])&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1634798">SERVER-54822</key>
            <summary>Push $sort before $unwind when possible</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="militsa.sotirova@mongodb.com">Militsa Sotirova</assignee>
                                    <reporter username="renato.riccio@mongodb.com">Renato Riccio</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 26 Feb 2021 17:25:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:58 +0000</updated>
                            <resolved>Mon, 14 Jun 2021 14:31:12 +0000</resolved>
                                    <version>4.4.4</version>
                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4108095" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:56:50 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3880363" author="xgen-internal-githook" created="Wed, 16 Jun 2021 08:27:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Militsa Sotirova&apos;, &apos;email&apos;: &apos;militsa.sotirova@mongodb.com&apos;, &apos;username&apos;: &apos;militsasotirova&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54822&quot; title=&quot;Push $sort before $unwind when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54822&quot;&gt;&lt;del&gt;SERVER-54822&lt;/del&gt;&lt;/a&gt;: sort should be pushed automatically before unwind if sort is happening on a different field.&lt;br/&gt;
Branch: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34632&quot; title=&quot;config.chunks change to config.cache.chunks creates a collection long name after upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34632&quot;&gt;SERVER-34632&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd808e64b2a34bedfeeef012c2ef9314bec08e8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd808e64b2a34bedfeeef012c2ef9314bec08e8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3875844" author="xgen-internal-githook" created="Mon, 14 Jun 2021 14:07:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Militsa Sotirova&apos;, &apos;email&apos;: &apos;militsa.sotirova@mongodb.com&apos;, &apos;username&apos;: &apos;militsasotirova&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54822&quot; title=&quot;Push $sort before $unwind when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54822&quot;&gt;&lt;del&gt;SERVER-54822&lt;/del&gt;&lt;/a&gt;: sort should be pushed automatically before unwind if sort is happening on a different field.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd808e64b2a34bedfeeef012c2ef9314bec08e8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd808e64b2a34bedfeeef012c2ef9314bec08e8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3748922" author="david.percy" created="Fri, 30 Apr 2021 15:20:39 +0000"  >&lt;p&gt;We should make sure this doesn&apos;t inhibit the $lookup + $unwind optimization.&#160; If you have $lookup, $unwind, $sort, and the $lookup can absorb the $unwind, it would be bad if the $sort stage somehow got stuck in between.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1655422">SERVER-55417</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="320662">SERVER-26442</issuekey>
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