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    <title>MongoDB Jira</title>
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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-46233] Aggregation $sort stages that get pushed down may miss opportunities to be optimized</title>
                <link>https://jira.mongodb.org/browse/SERVER-46233</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In some cases, ordering a $match in front of a $sort can require a second call to pipelineOptimize: the first call simplifies the $match, enabling the second call to recognize that the $match can be moved.&lt;/p&gt;

&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7568&quot; title=&quot;Aggregation framework favors non-blocking sorts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7568&quot;&gt;&lt;del&gt;SERVER-7568&lt;/del&gt;&lt;/a&gt;, it&apos;s possible for a sort to get pushed into the $cursor stage before the second call to pipelineOptimize, preventing the optimization from happening.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1157934">SERVER-46233</key>
            <summary>Aggregation $sort stages that get pushed down may miss opportunities to be optimized</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Tue, 18 Feb 2020 19:04:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:04 +0000</updated>
                            <resolved>Tue, 24 Mar 2020 02:08:17 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3028529" author="xgen-internal-githook" created="Mon, 6 Apr 2020 23:54:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46233&quot; title=&quot;Aggregation $sort stages that get pushed down may miss opportunities to be optimized&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46233&quot;&gt;&lt;del&gt;SERVER-46233&lt;/del&gt;&lt;/a&gt; Relocate second call to optimizePipeline()&lt;/p&gt;

&lt;p&gt;The second call to optimizePipeline() can sometimes catch&lt;br/&gt;
optimizations that were missed in the first call. The first call&lt;br/&gt;
simplifies filter expressions, opening up some optimization&lt;br/&gt;
opportunities that were previously blocked.&lt;/p&gt;

&lt;p&gt;We want to catch these opportunities before we push down any stages&lt;br/&gt;
into the PlanExecutor.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 30bd61a92cd4c8d6dd5588b59b9bdf4a0cd3c7d8)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/66c085520ffde8bf8fcf8440c7155e243cb00242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/66c085520ffde8bf8fcf8440c7155e243cb00242&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2993530" author="xgen-internal-githook" created="Tue, 24 Mar 2020 02:05:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Justin Seyster&apos;, &apos;username&apos;: &apos;jseyster&apos;, &apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46233&quot; title=&quot;Aggregation $sort stages that get pushed down may miss opportunities to be optimized&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46233&quot;&gt;&lt;del&gt;SERVER-46233&lt;/del&gt;&lt;/a&gt; Relocate second call to optimizePipeline()&lt;/p&gt;

&lt;p&gt;The second call to optimizePipeline() can sometimes catch&lt;br/&gt;
optimizations that were missed in the first call. The first call&lt;br/&gt;
simplifies filter expressions, opening up some optimization&lt;br/&gt;
opportunities that were previously blocked.&lt;/p&gt;

&lt;p&gt;We want to catch these opportunities before we push down any stages&lt;br/&gt;
into the PlanExecutor.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/30bd61a92cd4c8d6dd5588b59b9bdf4a0cd3c7d8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/30bd61a92cd4c8d6dd5588b59b9bdf4a0cd3c7d8&lt;/a&gt;&lt;/p&gt;</comment>
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