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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-42579] combined $match and $project stages</title>
                <link>https://jira.mongodb.org/browse/SERVER-42579</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We ran into an aggregation pipeline optimization problem. We have a $match stage  and a $group stage. The $match stage uses an index and its optimal, it returns approx. 32k (avg. size 1.7KB) documents. The fetch takes long 400-500 ms from total runtime of 500-600ms , wouldn&apos;t it be possible to merge a $match and $project stage so we could filter unnecessary fields for the $group stage. We experimented with the regular find method and we saw a significant benefit for the fetch with projecting.&lt;/p&gt;</description>
                <environment>Mongo DB version 4.0.10</environment>
        <key id="881905">SERVER-42579</key>
            <summary>combined $match and $project stages</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="4">Incomplete</resolution>
                                        <assignee username="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="mitereiter@gmail.com">Mitereiter Balazs Zoltan</reporter>
                        <labels>
                            <label>$match</label>
                            <label>$project</label>
                            <label>fetch</label>
                            <label>optimization</label>
                    </labels>
                <created>Thu, 1 Aug 2019 09:21:04 +0000</created>
                <updated>Wed, 4 Sep 2019 19:20:46 +0000</updated>
                            <resolved>Wed, 4 Sep 2019 19:20:46 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2357858" author="daniel.hatcher" created="Mon, 5 Aug 2019 15:37:45 +0000"  >&lt;p&gt;For us to best look into this, can you please provide examples of your slow aggregations and fast finds with their relevant explains?&lt;/p&gt;</comment>
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