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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49306] Optimization for mid-pipeline $project stages</title>
                <link>https://jira.mongodb.org/browse/SERVER-49306</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In general, aggregation pipelines are automatically optimized by the server to include only the data which is to be used in the pipeline and/or output at the end. Adding a &lt;b&gt;$project&lt;/b&gt; in earlier stages doesn&apos;t really limit the amount of data being used in the stages that follow, because the pipeline dependency analysis &lt;b&gt;&lt;em&gt;automatically&lt;/em&gt;&lt;/b&gt; figures out which fields are needed by the pipeline. Adding &lt;b&gt;$project&lt;/b&gt; stages in mid-pipeline can therefore be redundant, and it can prevent pipeline dependency analysis from figuring out which fields are needed by the pipeline (which it does automatically).&lt;/p&gt;

&lt;p&gt;The &lt;b&gt;$project&lt;/b&gt; is typically intended only to rename fields or reshape data to be output, and therefore, in most cases, &lt;b&gt;$project&lt;/b&gt; should only be placed at the end of an aggregation pipeline and can be avoided in many cases.&lt;/p&gt;

&lt;p&gt;This is an enhancement request for optimizing mid-pipeline &lt;b&gt;$project&lt;/b&gt; stages, and possibly convert them to &lt;b&gt;$addFields&lt;/b&gt;, so that they don&apos;t interfere with the pipeline dependency analysis.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1400688">SERVER-49306</key>
            <summary>Optimization for mid-pipeline $project stages</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="3">Duplicate</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="harshad.dhavale@mongodb.com">Harshad Dhavale</reporter>
                        <labels>
                    </labels>
                <created>Thu, 2 Jul 2020 22:46:27 +0000</created>
                <updated>Tue, 7 Jul 2020 15:36:06 +0000</updated>
                            <resolved>Tue, 7 Jul 2020 15:36:06 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3272366" author="asya" created="Tue, 7 Jul 2020 15:35:55 +0000"  >&lt;p&gt;This looks to be a duplicate of existing ticket: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13703&quot; title=&quot;Presence of extraneous $project causes a less efficient plan to be used&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13703&quot;&gt;SERVER-13703&lt;/a&gt; so marking it as such.&lt;/p&gt;</comment>
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