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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-28592] Move $sample earlier in the aggregation pipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-28592</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When $sample is the first stage of an aggregation pipeline, the executor optimizes it with storage-engine support.  This optimization could be extended to more use cases by moving $sample prior to stages that don&apos;t alter the number of documents that pass through it, including&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;$project&lt;/li&gt;
	&lt;li&gt;$addFields&lt;/li&gt;
	&lt;li&gt;$lookup&lt;/li&gt;
	&lt;li&gt;$sort&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;While most applications can ensure the $sample is first in the pipeline, there is one important use case where this is not possible: views.  It&apos;s common for our own tools (mongodrdl, compass) to sample views, and often those views contain a pipeline consisting of only the above stages, and MongoDB will tack the $sample to the end of the view&apos;s pipeline.  This optimization will improve the performance of that $sample by pushing it down to the storage engine.&lt;/p&gt;

</description>
                <environment></environment>
        <key id="370506">SERVER-28592</key>
            <summary>Move $sample earlier in the aggregation pipeline</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="9">Done</resolution>
                                        <assignee username="jacob.evans@mongodb.com">Jacob Evans</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                            <label>QFB</label>
                            <label>asya</label>
                            <label>bi-performance</label>
                            <label>optimization</label>
                    </labels>
                <created>Mon, 3 Apr 2017 19:15:58 +0000</created>
                <updated>Thu, 8 Nov 2018 12:36:12 +0000</updated>
                            <resolved>Wed, 7 Nov 2018 16:57:08 +0000</resolved>
                                                    <fixVersion>4.1.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>5</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="2054752" author="xgen-internal-githook" created="Wed, 7 Nov 2018 17:21:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jacob Evans&apos;, &apos;email&apos;: &apos;jacob.evans@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28592&quot; title=&quot;Move $sample earlier in the aggregation pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28592&quot;&gt;&lt;del&gt;SERVER-28592&lt;/del&gt;&lt;/a&gt; Fixed line-wrapping comment&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f628d2069bda8ccc444c3331648618937f97bd8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f628d2069bda8ccc444c3331648618937f97bd8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2054714" author="xgen-internal-githook" created="Wed, 7 Nov 2018 16:55:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jacob Evans&apos;, &apos;email&apos;: &apos;jacob.evans@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28592&quot; title=&quot;Move $sample earlier in the aggregation pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-28592&quot;&gt;&lt;del&gt;SERVER-28592&lt;/del&gt;&lt;/a&gt; Move $sample earlier in the aggregation pipeline&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7fadb5dc1ddecb37617b2d927960cd15da8172b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7fadb5dc1ddecb37617b2d927960cd15da8172b2&lt;/a&gt;&lt;/p&gt;</comment>
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